Public Relations Techniques and Cases Essay Example | Topics and Well Written Essays - 1500 words

Advertising Techniques and Cases - Essay Example A contextual analysis is a favored system when ‘how’ or ‘why questions are being presented when the scientist has little command over occasions. The attention is consistently on contemporary wonders inside some true setting (Center et al., 2008). The scientist is empowered to investigate on genuine occasions that can't be controlled in the lab setting (Yin, 1994).The contextual analysis should utilize various proof sources to expand legitimacy (Jaques, 2008). The contextual investigation beneath featured the correspondence exercises in the main period of Phare and took an inside and out glance at the model correspondence program created in November 1997. The model was created by Brussels-based open undertakings consultancy to be utilized by the EU designation to the 10 EU part nations. The model can apply to numerous other financial and political circumstances and social factors of a nation. It accentuates on one-on â€one correspondence as opposed to including the broad communications. In the principal long stretches of activity from 1989-1994, the Phare program gave skill to the part nations from a wide scope of associations running from non-business, open and even private. It went about as a multiplier by animating ventures and reacting to needs that can't be met by different associations. Phare additionally went about as an amazing impetus for opening assets from different benefactors contemplates, ensure plans, and credit lines. It offers need to the improvement of the private division, rebuilding of state venture and condition assurance.

Alligators and Crocodiles Essay Essay Example

Gators and Crocodiles Essay Example Gators and Crocodiles Essay Gators and Crocodiles Essay Relatively few individuals can recognize a crocodile and a gator. Gators and crocodiles are comparative yet unique from various perspectives. In this paper I will talk the gator and crocodile likenesses and contrasts. In the event that you see a gator or a crocodile would you be able to express the distinction? The manners in which you can express the distinction in a gator and a crocodile is the neb. centripetal depressions. salt secretory organs on lingua. jaws and dentition. Other than in this paper I will paint you a picture of how the reptilians look and reveal to you the distinction in the reptile’s size and home ground. Crocs are semi-amphibian meat eating reptilians with four legs and a tremendous tail. Col. 2010 ) . The reptilian tail is a large portion of its length and it induces the crocodile through the H2O. It is other than utilized as an arm and shops fat for the gator which he will use for nutriment for the winter. They are merciless ( poikilothermic ) energize creatures which do non do their ain natural structure heat yet gain their warmth by getting a charge out of in the Sun. ( Col. 2010 ) . The Chinese crocodile can turn between 6 pess long and American gators are 13 pess long however can go up to 19 pess. Crocodiles have enormous. wide natural structures with short legs and long. strong tail. The crocodile has thick. rugged covering with hard. plate-formed graduated tables. ( Hayden ) . They are relentless quicken creatures that shading is either dim green or earthy colored. The crocodile have ears which are cuts on the caput that the vast majority of us do non see and let them to hold great hearing. The crocodile caput is long and pointed with the eyes and foremost nariss situated on the highest point of the caput. Crocodile can run from 7-15 pess long yet neer end turning and can populate up to 75 mature ages. Alligator’s upper jaw is more extensive than the lower jaw and its lower dentition are to a great extent concealed when oral pit is shut and fit into attachments in the upper jaw yet makes the fourth tooth on every side of its lower jaw fit of rage into an attachment in the upper jaw. Turner ) . Gators have a wide U-molded short neb. Crocodiles have non-utilitarian salt secretory organs and centripetal holes that are simply close to the jaws. ( Col. 2010 ) Crocodiles upper jaws is about a similar size as the lower jaw which makes its lower dentition appear outside the upper jaw when oral cavity is shut. ( Turner ) The crocodile upper dentition appear outside the lower jaw however nebs are thin. angular and long. Crocodile salt secretory organs on the lingua discharge additional salt and the centripetal cavities are over the majority of the natural structure. Gators are simply local to the United States and China however prefer to eat fish. polo-necks. grouped warm blooded animals. flying creatures and different reptilians. The croc lives just in new Waterss like pools. fens. wetlands. streams. lakes. what's more, swamps. ( Lutz. 2012 ) . When ashore the croc is delayed to travel however can travel sensibly quickly in short separations. The crocodiles are typically solitary energize creatures yet littler 1s can be found in huge Numberss close to one another. ( Lutz. 2012 ) Crocodiles live along the beach of Florida. . Focal America. what's more, portions of South America. The crocodile may populate in saline or salt-water that is warm and calm, for example, Rhizophora ruin overwhelms that are generally found against the shorelines. ( Turner ) . Crocodile other than may populate where the stream meets the ocean known as estuaries. The crocodile eat fish and other enliven creatures that they find in or close to the H2O. counting polo-necks. snakes. little well evolved creatures. also, winged creatures. The reptilian does the vast majority of its chasing at dim which makes him nighttime. Crocodiles are other than shy. isolated. what's more, only from time to time observed by individuals however are still extremely forceful. ( Hayden ) Since gators and crocodile are the two reptilians they are regularly simple mixed up. I trust by perusing this you would now be able to express the distinction between a gator and a crocodile. Gators and crocodile physical visual viewpoint are actually similarly however in the event that you take a gander at the reptilians you could simple show out what is unique. The things that are distinctive about them are the neb. salt secretory organs on lingua. centripetal pits. jaws. also, dentitions. Recall crocodiles are extremely forceful so do non close to them since they will assault. Since you have a superior visual of a crocodile and gator. if you somehow managed to come into contact with one of the reptilians would you be able to express the distinction between the two.

Cha-Ching! How to Budget in College

Cha-Ching! How to Budget in College Ever since I began writing blogs, I’ve learned about various topics like how to manage classes, how to stay involved while still being a full-time student, etc. Something that came to my mind that could be useful for many of us is a quick discussion on budgeting. We’ve all heard that college students are broke, and while it is true that we have tuition and books to pay for during our four years, I’ve come up with a few tips that I have implemented in my life to help me save a few extra bucks at the end of the day! Check your bank account. Checking your bank account is the most important thing to do. Sometimes it can be difficult to check it daily given our busy schedules. Set aside a few minutes every day to keep tabs on your account activity. This will ensure there are no discrepancies and youre aware of how much you have and are spending. Set financial goals. This past semester, my goal was to save enough money to be able to buy graduation gifts for my close friends and family at the end of the semester. No matter how big or small, it is nice to have a goal to work toward so that you don’t lose track of what you’re saving for. From: Kiplingers Financial Planning Create a budget. I prefer creating a weekly budget of how much I allocate for food, social activities, and miscellaneous costs throughout the week and over the weekend. Create an excel sheet or some sort of organized document that can list out your budgeted money for the week/month. Many programs have templates for budgeting that are completely free to use! These are just a few basic tips I think every student should follow to help with budgeting money. I have been following these few steps the past two semesters and I have seen my savings grow in my bank account. Being mindful of where and when you spend your money is a tough but important thing to do. This is especially vital as we will soon enter the real world where we will deal with more money. But before that happens, it’s important to take responsibility for our earnings and put them to good use! Kripa Class of 2020 I'm majoring in Psychology, minoring in Spanish, and pursuing a pre-dental track. It seems like I’m all over the place, but that’s what I like about college! I get to choose to study what I’m interested in, and I’m happy to be doing just that at Illinois.

Cerebral Palsy, The Most Common Physical Disability Of...

According to Lancet Neurology, Cerebral Palsy is â€Å"the most common physical disability of childhood†¦ and a clinical diagnosis encompassing a heterogeneous group of neurodevelopmental disorders that cause impairments of movement and posture†¦Ã¢â‚¬  (Moreno-De-Luca, Ledbetter, 2012). It is no wonder then, that Crotched Mountain strives to provide the best of services for individuals living with cerebral palsy. Some of these services include special school programming specific to an individual’s needs as well as thorough rehabilitation interventions and treatment through the hospital and residential living. These unique and purposeful services are what help residents and clients of Crotched Mountain take steps forward in their treatment or recovery. Crotched Mountain Rehab hopes that in offering so many specific programs and adapted services they are able to enhance the quality of lives both in and outside of their doors. Exact etiological factors of Cerebral Pal sy (CP) are not specifically known. Researchers have been doing much to decipher the causes of a child diagnosis of CP. What is believed up to this point is that there are several keys to the classification of cerebral palsy which in turn, lead o a greater understanding of what may have caused it. These classifications are made based off of the following; the severity (which is determined using the Gross Motor Function Classification System), the motor type determined (spastic, ataxic, or dyskinetic) and the topographicalShow MoreRelatedA Critical Review Of A Journal Paper1958 Words   |  8 PagesA Critical Review of a Journal Paper Introduction Cerebral palsy is a group of disorders that permanently affects an individual’s ability to move such as body movement, muscle control and contraction, this can be caused by a combination of abnormal development or damage to parts of the brain that control movement, balance and posture. 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Children with congenital brain malformations, a family history of epilepsy, or neonatal seizures are atRead MoreUnderstand the Context of Supporting Individuals with Learning Disabilities4094 Words   |  17 PagesLEARNING DISABILITIES OUTCOME 1 1. There are various pieces of legislation in place to promote equality and reduce discrimination. These include: * The Disability Discrimination Act 2005 * The Special Educational Needs and Disability Act 2001 * The Race Relations (Amendment) Act 2000 * Convention on the Rights of the Child (UN, 1989) * The Human Rights Act 1998 * The Sex Discrimination Act 1975 (as amended) * Employment Equality Regulations 2003 2. The Disability DiscriminationRead MoreNU 545 Unit 2 Essay10921 Words   |  44 Pagesand behavior, maintaining balance and posture? - Ch. 15 p. 454 Box 15-3 - Brainstem- midbrain, medulla oblongata, and pons Reticular Formation-Collection of nuclei within brainstem that maintains wakefulness and works in conjunction with the cerebral cortex and together they are known as the reticular activating system. P. 454 - 3 parts of the brain: forebrain, midbrain, hindbrain - Expression of affect (emotional and behavioral states) is mediated by extensive connections with the limbicRead MoreThe Effects Of Autism On Children With Autism3085 Words   |  13 PagesHFASD) appear to be particularly at risk for behavior and emotional problems, especially depression and anxiety† (Rosin 2014). Autism is defined by three key areas, and is known by specific disorders such as pervasive developmental disorders (PDD), childhood disintegrative disorder (CDD), and pervasive developmental disorder not otherwise specified (PDD-NOS). Among PPD’s include Asperger’s syndrome and Rett’s disorder. â€Å"About 1 in 68 children have been identified with autism spectrum disorder.† (DataRead MoreEssay on Life With Spina Bifida2829 Words   |  12 PagesBACKGROUND: Having a chronic physical disability affects many aspects of a person’s life beyond his or her general health (Eiser 1997). Myelomeningocele, the most severe form of spina bifida (SB), is commonly associated with hydrocephalus, Chiari II malformation, diminished or absent sensation or motor function in the lower limbs, and impaired bowel and bladder control (S.L. Kinsman 2007). Many people with SB rely on some form of assistive technology for mobility, such as wheelchairs, crutchesRead More The Impact and History of Learning Disorders on Children Essay5477 Words   |  22 Pagesout concisely the fundamental role that education would play in postwar America: â€Å"Today, education is perhaps the most important function of state and local governments. Compulsory school attendance laws and the great expenditures for education both demonstrate our recognition of the importance of education to our democratic society. It is required in the performance of our most basic public responsibilities, even service in the armed forces. It is the very foundation of good citizenship. TodayRead MoreThe Theory Of Counseling And Therapy Theories6153 Words   |  25 PagesSummary * Influences of Theories--How counseling theories influence your understanding of how to work with consumers with disabilities. The theories we learned provided a broad-based understanding of numerous factors related to the evolution of counseling and therapy theories and practices, along with new counseling and therapy skills. The important premise that underscores one of the central challenges of counseling and psychotherapy is that we are all in the same world, but each of us makes different

Incidents During The Life Of A Slave Girl By Harriet Jacobs

Incidents in the Life of a Slave Girl Incidents in the Life of a Slave Girl by Harriet Jacobs is an Autobiography from the point of view of a southern slave. She has named herself Linda Brent in the book to keep her identity anonymous. The book takes place in between 1820-1840 in which slavery was still legal and common throughout the United States south. The book begins in an unnamed town in the south in which the protagonist was raised in as a slave. Harriet Jacobs wrote the book to shine light on how slaves were treated in the south. She shows how even thought they were not always treated poorly they were never treated as equals.The purpose of the book is to show the horrors and tribulations a slave would have to go through on a daily basis. Not only does she point out the life of a slave but also the life of a women during a time in which even a white women were not treated as equals. Harriet Jacobs writes this book to anyone who is not a slave. In particular she writes to men and women in the north in hopes that t hey can help free them from the injustices that slaves and women face everyday. Harriet Jacobs chose to write to the north because she knows that only the north can stop slavery because the south is completely engulfed in the practice of slavery. Harriet Jacobs attempts to inform the north by writing a slave narrative about her own life. She does this by using the pen name of Linda Brent. The narrative begins in an unnamed town in the American South. She isShow MoreRelated Incidents In The Life Of A Slave Girl Essay1671 Words   |  7 PagesHarriet Jacobs wanted to tell her story, but knew she lacked the skills to write the story herself. She had learned to read while young and enslaved, but, at the time of her escape to the North in 1842, she was not a proficient writer. She worked at it, though, in part by writing letters that were published by the New York Tribune, and with the help of her friend, Amy Post. 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I think that this narrative writing is an important text to help us understand the different perspectives of slavery in America. There are some slave owners that are kind and humane, and some slave owners that are cruel and abusive. Additionally, reading from a female slave’s perspectives teaches us that life on the plantations and life in theRead More Incidents in the Life of a Slave Girl by Harriet Jacobs Essay1711 Words   |  7 PagesIncidents in the Life of a Slave Girl by Harriet Jacobs Harriet Jacobs in Incidents in the Life of a Slave Girl uses clear detail and straightforward language, except when talking about her sexual history, to fully describe what it is like to be a slave. Jacobs says that Northerners only think of slavery as perpetual bondage; they dont know the depth of degradation there is to that word. She believes that no one could truly understand how slavery really is unless they have gone through it.Read MoreJacobs Douglass: An Insight Into The Experience of The American Slave1019 Words   |  5 PagesThe slave narratives of the ante-bellum time period have come across numerous types of themes. Much of the work concentrates on the underlining ideas beneath the stories. In the narratives, fugitives and ex-slaves appealed to the humanity they shared with their readers during these times, men being lynched and marked all over and women being the subject of grueling rapes. The slave narrative of Frederick Douglas and Harriet Jacobs: Incidents in the Life of a Slave Girl themes come from the existenceRead MoreEssay about Harriet Jacobs Incidents In The Life Of A Slave Girl1355 Words   |  6 PagesHarriet Jacobs Incidents In The Life Of A Slave Girl The feminist movement sought to gain rights for women. Many feminist during the early nineteenth century fought for the abolition of slavery around the world. The slave narrative became a powerful feminist tool in the nineteenth century. Black and white women are fictionalized and objectified in the slave narrative. White women are idealized as pure, angelic, and chaste while black woman are idealized as exotic and contained an uncontrollableRead MoreIncidents In The Life A Slave Girl Summary1630 Words   |  7 Pages Harriet Jacobs writes, â€Å"No pen can give an adequate description of all [the] pervading corruption of slavery.† In the book, Incidents in the Life a Slave Girl, Harriet Jacobs recount her time as a slave before escaping the cruelties of slavery to freedom. This quote from the book outlines the intelligence Harriet Jacobs has about the torment in slavery. In the beginning of the book the preface and the editor’s introduction to the book outline Harriet Jacobs story. Both the preface and the author’sRead MoreIncidents Throughout The Life Of A Slave Girl By Harriet Jacobs1505 Words   |  7 PagesIncidents in the life of a slave girl’ written by Harriet Jacobs and published by L.Maria Child (in 1831), is an autobiography by the author herself which documents Jacobs life as a slave and therefore The book starts when Jacobs is born as a slave in a city of North Carolina and then continues through her escape, her status as a runaway fugitive in the North, and finally her path to freedom when one of her northern white friends buys her in the year 1852. Incidents in the Life of a Slave GirlRead MoreThe Life of A Slave Girl by Harriet A. Jacobs Essay1272 Words   |  6 PagesA slave narrative is to tell a slaves story and what they have been through. Six thousand former slaves from North America told about their lives during the 18th and 19th centuries. About 150 narratives were published as separate books or articles most slaves were born in the last years of the slave regime or during the Civil War. Some Slaves told about their experiences on plantations, in cities, and on small farms. Slave narratives are one of the only ways that people today know about the wayRead MoreHarriet Jacobs s Story : The True Meaning Of A Slave s Quest For Freedom1682 Words   |  7 PagesHarriet Jacobs’s story informs the reader of her experiences and transformative tribulations she had to undergo from childhood to adulthood. No one in today’s society could come close to comprehending the amount of heartache, torment, anguish, and co mplete misery women had to suffer and endure during slavery. However, we can all learn from Jacobs’s heartbreaking story to understand the true meaning of a slave’s quest for freedom and the inalienable bond a mother has for her children. Life was tough

Steam Jet Refrigeration Cycle Free Essays

string(61) " ow rates gives the mass \? ow rate of the compressed vapor\." Chemical Engineering and Processing 41 (2002) 551– 561 www. elsevier. com/locate/cep Evaluation of steam jet ejectors Hisham El-Dessouky *, Hisham Ettouney, Imad Alatiqi, Ghada Al-Nuwaibit Department of Chemical Engineering, College of Engineering and Petroleum, Kuwait Uni6ersity, P. We will write a custom essay sample on Steam Jet Refrigeration Cycle or any similar topic only for you Order Now O. Box 5969, Safat 13060, Kuwait Received 4 April 2001; received in revised form 26 September 2001; accepted 27 September 2001 Abstract Steam jet ejectors are an essential part in refrigeration and air conditioning, desalination, petroleum re? ning, petrochemical and chemical industries. The ejectors form an integral part of distillation columns, condensers and other heat exchange processes. In this study, semi-empirical models are developed for design and rating of steam jet ejectors. The model gives the entrainment ratio as a function of the expansion ratio and the pressures of the entrained vapor, motive steam and compressed vapor. Also, correlations are developed for the motive steam pressure at the nozzle exit as a function of the evaporator and condenser pressures and the area ratios as a function of the entrainment ratio and the stream pressures. This allows for full design of the ejector, where de? ing the ejector load and the pressures of the motive steam, evaporator and condenser gives the entrainment ratio, the motive steam pressure at the nozzle outlet and the cross section areas of the diffuser and the nozzle. The developed correlations are based on large database that includes manufacturer design data and experimental data. The model includes correlatio ns for the choked ? ow with compression ratios above 1. 8. In addition, a correlation is provided for the non-choked ? ow with compression ratios below 1. 8. The values of the coef? cient of determination (R 2) are 0. 85 and 0. 78 for the choked and non-choked ? w correlations, respectively. As for the correlations for the motive steam pressure at the nozzle outlet and the area ratios, all have R 2 values above 0. 99.  © 2002 Elsevier Science B. V. All rights reserved. Keywords: Steam jet ejectors; Choked ? ow; Heat pumps; Thermal vapor compression 1. Introduction Currently, most of the conventional cooling and refrigeration systems are based on mechanical vapor compression (MVC). These cycles are powered by a high quality form of energy, electrical energy. The inef? cient use of the energy required to operate such a process can be generated by the combustion of fossil uels and thus contributes to an increase in greenhouse gases and the generation of air pollutants, such as NOx, S Ox, particulates and ozone. These pollutants have adverse effects on human health and the environment. In addition, MVC refrigeration and cooling cycles use unfriendly chloro-? oro-carbon compounds (CFCs), which, upon release, contributes to the destruction of the protective ozone layer in the upper atmosphere. * Corresponding author. Tel. : + 965-4811188Ãâ€"5613; fax: + 9654839498. E -mail address: eldessouky@kuc01. kuniv. edu. kw (H. El-Dessouky). Environmental considerations and the need for ef? cient se of available energy call for the development of processes based on the use of low grade heat. These processes adopt entrainment and compression of low pressure vapor to higher pressures suitable for different systems. The compression process takes place in absorption, adsorption, chemical or jet ejector vapor compression cycles. Jet ejectors have the simplest con? guration among various vapor compression cycles. In contrast to other processes, ejectors are formed of a single uni t connected to tubing of motive, entrained and mixture streams. Also, ejectors do not include valves, rotors or other moving parts and are available ommercially in various sizes and for different applications. Jet ejectors have lower capital and maintenance cost than the other con? gurations. On the other hand, the main drawbacks of jet ejectors include the following: ? Ejectors are designed to operate at a single optimum point. Deviation from this optimum results in dramatic deterioration of the ejector performance. 0255-2701/02/$ – see front matter  © 2002 Elsevier Science B. V. All rights reserved. PII: S 0 2 5 5 – 2 7 0 1 ( 0 1 ) 0 0 1 7 6 – 3 552 ? H. El -Dessouky et al. / Chemical Engineering and Processing 41 (2002) 551 – 561 Ejectors have very low thermal ef? iency. Applications of jet ejectors include refrigeration, air conditioning, removal of non-condensable gases, transport of solids and gas recovery. The function of the jet ejector differs considerably in these processes. For example, in refrigeration and air conditioning cycles, the ejector compresses the entrained vapor to higher pressure, which allows for condensation at a higher temperature. Also, the ejector entrainment process sustains the low pressure on the evaporator side, which allows evaporation at low temperature. As a result, the cold evaporator ? uid can be used for refrigeration and cooling functions. As for the removal of non-condensable gases in heat transfer units, the ejector entrainment process prevents their accumulation within condensers or evaporators. The presence of non-condensable gases in heat exchange units reduces the heat transfer ef? ciency and increases the condensation temperature because of their low thermal conductivity. Also, the presence of these gases enhances corrosion reactions. However, the ejector cycle for cooling and refrigeration has lower ef? ciency than the MVC units, but their merits are manifested upon the use of low grade energy that has limited effect on the environment and lower ooling and heating unit cost. Although the construction and operation principles of jet ejectors are well known, the following sections provide a brief summary of the major features of ejectors. This is necessary in order to follow the discussion and analysis that follow. The conventional steam jet ejector has three main parts: (1) the nozzle; (2) the suction chamber; a nd (3) the diffuser (Fig. 1). The nozzle and the diffuser have the geometry of converging/diverging venturi. The diameters and lengths of various parts forming the nozzle, the diffuser and the suction chamber, together with the stream ? ow rate and properties, de? e the ejector capacity and performance. The ejector capacity is de? ned in terms of the ? ow rates of the motive steam and the entrained vapor. The sum of the motive and entrained vapor mass ? ow rates gives the mass ? ow rate of the compressed vapor. You read "Steam Jet Refrigeration Cycle" in category "Essay examples" As for the ejector performance, it is de? ned in terms of entrainment, expansion and compression ratios. The entrainment ratio (w ) is the ? ow rate of the entrained vapor Fig. 1. Variation in stream pressure and velocity as a function of location along the ejector. H. El -Dessouky et al. / Chemical Engineering and Processing 41 (2002) 551 – 561 divided by the flow rate of the motive steam. As for the expansion ratio (Er), it is de? ned as the ratio of the motive steam pressure to the entrained vapor pressure. The compression ratio (Cr) gives the pressure ratio of the compressed vapor to the entrained vapor. Variations in the stream velocity and pressure as a function of location inside the ejector, which are shown in Fig. 1, are explained below: ? The motive steam enters the ejector at point (p ) with a subsonic velocity. ? As the stream ? ows in the converging part of the ejector, its pressure is reduced and its velocity increases. The stream reaches sonic velocity at the nozzle throat, where its Mach number is equal to one. The increase in the cross section area in the diverging part of the nozzle results in a decrease of the shock wave pressure and an increase in its velocity to supersonic conditions. ? At the nozzle outlet plane, point (2), the motive steam pressure becomes lower than the entrained vapor pressure and its velocity ranges between 900 and 1200 m/s. ? The entrained vapor at point (e ) enters the ejector, where its velocity increases and its pressure decreases to that of point (3). ? The motive steam and entrained vapor streams may mix within the suction chamber and the converging section of the diffuser or it may ? ow as two separate treams as it enters the constant cross section area of the diffuser, where mixing occurs. ? In either case, the mixture goes through a shock inside the constant cross section area of the diffuser. The shock is associated with an increase in the mixture pressure and reduction of the mixture velocity to subsonic conditions, point (4). The shock occurs because of the back pressure resistance of the condenser. ? As the subsonic mixture emerges from the constant cross section area of the diffuser, further pressure increase occurs in the diverging section of the diffuser, where part of the kinetic energy of the mixture is converted into pressure. The pressure of the emerging ? uid is slightly higher than the condenser pressure, point (c ). Summary for a number of literature studies on ejector design and performance evaluation is shown in Table 1. The following outlines the main ? ndings of these studies: ? Optimum ejector operation occurs at the critical condition. The condenser pressure controls the location of the shock wave, where an increase in the condenser pressure above the critical point results in a rapid decline of the ejector entrainment ratio, since the shock wave moves towards the nozzle exit. Operating at pressures below the critical points has negligible effect on the ejector entrainment ratio. 553 ? At the critical condition, the ejector entrainment ratio increases at lower pressure for the boiler and condenser. Also, higher temperature for the evaporator increases the entrainment ratio. ? Use of a variable position nozzle can maintain the optimum conditions for ejector operation. As a result, the ejector can be maintained at critical conditions even if the operating conditions are varied. ? Multi-ejector system increases the operating range and improves the overall system ef? ciency. Ejector modeling is essential for better understanding of the compression process, system design and performance evaluation. Models include empirical correlations, such as those by Ludwig [1], Power [2] and El-Dessouky and Ettouney [3]. Such models are limited to the range over which it was developed, which limits their use in investigating the performance of new ejector ? uids, designs or operating conditions. Semi-empirical models give more ? exibility in ejector design and performance evaluation [4,5]. Other ejector models are based on fundamental balance equations [6]. This study is motivated by the need for a simple mpirical model that can be used to design and evaluate the performance of steam jet ejectors. The model is based on a large database extracted from several ejector manufacturers and a number of experimental literature studies. As will be discussed later, the model is simple to use and it eliminates the need for iterative procedures. 2. Mathematical model The review by Sun and Eames [7] outlined the developments in mathematical modeling and design of jet ejectors. The review shows that there are two basic approaches for ejector analysis. These include mixing of the motive steam and entrained vapor, either at constant ressure or at constant area. Design models of stream mixing at constant pressure are more common in literature because the performance o f the ejectors designed by this method is more superior to the constant area method and it compares favorably against experimental data. The basis for modeling the constant pressure design procedure was initially developed by Keenan [6]. Subsequently, several investigators have used the model for design and performance evaluation of various types of jet ejectors. This involved a number of modi? cations in the model, especially losses within the ejector and mixing of the primary and secondary streams. In this section, the constant pressure ejector model is developed. The developed model is based on a number of literature studies [8 – 11]. The constant pressure model is based on the following assumptions: H. El -Dessouky et al. / Chemical Engineering and Processing 41 (2002) 551 – 561 554 Table 1 Summary of literature studies on ejector design and performance Reference Fluid Boiler, evaporator and condenser temperature ( °C) Conclusion [19] R-113 60–100; 5–18; 40–50 Basis for refrigerant selection for solar system, system performance increased with increasing boiler and evaporator temperatures and decreasing condenser temperature. 20] R-113; R-114; R-142b; R-718 80–95; 5–13; 25–45 Comparison of ejector and refrigerant performance. Dry, wet and isentropic ?uids. Wet ? uid damage ejectors due phase change during isentropic expansion. R-113 (dry) has the best performance and R142b (wet) has the poorest performance. [21,22] R-11 4 86; ? 8; 30 Increase in ejector performance using mechanical compression booster. [8] Water 120–140; 5–10; 30–65 Choking of the entrained ? uid in the mixing chamber affects system performance. Maximum COP is obtained at the critical ? ow condition. [13] Water 120–140; 5–10; 30–60 Effect of varying the nozzle position to meet operating condition. Increase in COP and cooling capacity by 100%. [23] R-113 70–100; 6–25; 42–50 Entrainment ratio is highly affected by the condenser temperature especially at low evaporator temperature. [24] R-11 82. 2–182. 2; 10; 43. 3 Entrainment ratio is proportional to boiler temperature. [25,26] R-114 90; 4; 30 Combined solar generator and ejector air conditioner. More ef? cient system requires multi-ejector and cold energy storage (cold storage in either phase changing materials, cold water or ice). [27] R-134A 15; 30 Modeling the effect of motive nozzle on system performance, in which the ejector is used to recover part of the work that would be lost in the expansion valve using high-pressure motive liquid. [28] Water 100–165; 10; 30–45 Combined solar collector, refrigeration and seawater desalination system. Performance depends on steam pressure, cooling water temperature and suction pr essure. [4] Water [29] Water – Model of multistage steam ejector refrigeration system using annular ejector in which the primary ? uid enters the second stage at annular nozzle on the sidewall. This will increase static pressure for low-pressure stream and mixture and reduce the velocity of the motive stream and reduce jet mixing losses shock wave formation losses. [24] R11; R113; R114 93. 3; 10; 43. 3 Measure and calculate ejector entrainment ratio as a function of boiler, condenser and evaporator temperatures. Entrainment ratio decreases for off design operation and increases for the two stage ejectors. [30] R113; R114; R142b 120–140; 65–80 Effect of throat area, location of main nozzle and length of the constant area section on backpressure, entrainment ratio and compression ratio. Developed a new ejector theory in which the entrained ? uid is choked, the plant scale results agree with this theory. Steam jet refrigeration should be designed for the most often prevailing conditions rather than the most severe to achieve greater overall ef? ciency. [5] Mathematical model use empirical parameters that depend solely on geometry. The parameters are obtained experimentally for various types of ejectors. [31] R134a 5; ? 12, ? 18; 40 Combined ejector and mechanical compressor for operation of domestic refrigerator-freezer increases entrainment ratio from 7 to 12. 4%. The optimum throat diameter depends on the freezer emperature [9] R11; HR-123 80; 5; 30 Performance of HR-123 is similar to R-11 in ejector refrigeration. Optimum performance is achieved by the use of variable geometry ejector when operation conditions change. H. El -Dessouky et al. / Chemical Engineering and Processing 41 (2002) 551 – 561 1. The motive steam expands isentropically in the nozzle. Al so, the mixture of the motive steam and the entrained vapor compresses isentropically in the diffuser. 2. The motive steam and the entrained vapor are saturated and their velocities are negligible. 3. Velocity of the compressed mixture leaving the ejector is insigni? cant. 4. Constant isentropic expansion exponent and the ideal gas behavior. 5. The mixing of motive steam and the entrained vapor takes place in the suction chamber. 6. The ? ow is adiabatic. 7. Friction losses are de? ned in terms of the isentropic ef? ciencies in the nozzle, diffuser and mixing chamber. 8. The motive steam and the entrained vapor have the same molecular weight and speci? c heat ratio. 9. The ejector ? ow is one-dimensional and at steady state conditions. The model equations include the following: ? Overall material balance (2) Expansion ratio ? ‘ 2pn k? 1   Pp P2 n (k ? 1/k) ?1 Pe P2 n (k ? 1/k) ?1 (6) M*2 + wM*2 Te/Tp p e ‘ M 2(k + 1) M 2(k ? 1) + 2 (8) Eq. (8) is used to calculate M*2, M*2, M4 e p Mach number of the mixed ? ow after the shock wave 2 M2+ 4 (k ? 1) M5 = (9) 2k 2 M ? 1 (k ? 1) 4 Pressure increase across the shock wave at point 4 (10) In Eq. (10) the constant pressure assumption implies that the pressure between points 2 and 4 remains constant. Therefore, the following equality constraint applies P2 = P3 = P4. Pressure lift in the diffuser  n Pc p (k ? 1) 2 =d M5+1 P5 2 ? (5) ? (k/k ? 1) (11) where pd is the diffuser ef? ciency. The area of the nozzle throat A1 = where M is the Mach number, P is the pressure and is the isentropic expansion coef? cient. In the above equation, pn is the nozzle ef? ciency and is de? ned as the ratio between the actual enthalpy change and the enthalpy change undergone during an isentropic process. Isentropic expansion of the entrained ? uid in the suction chamber is expressed in terms of the Mach number of the entrained ? uid at the nozzle e xit plane   P5 1 + kM 2 4 = P4 1 + kM 2 5 (4) Isentropic expansion of the primary ? uid in the nozzle is expressed in terms of the Mach number of the primary ? uid at the nozzle outlet plane Mp2 = ? ? (3) Er = Pp/Pe ? ? 2 k? 1 (7) (1 + w )(1 + wTe/Tp) here w is the entrainment ratio and M * is the ratio between the local ? uid velocity to the velocity of sound at critical conditions. The relationship between M and M * at any point in the ejector is given by this equation M* = Compression ratio Cr = Pc/Pe ? ? ‘ The mixing process is modeled by one-dimensional continuity, momentum and energy equations. These equations are combined to de? ne the critical Mach number of the mixture at point 5 in terms of the critical Mach number for the primary and entrained ?uids at point 2 M* = 4 where m is the mass ? ow rate and the subscripts c, e and p, de? ne the compressed vapor mixture, the ntrained vapor and the motive steam or primary stream. Entrainment ratio w = me/mp ? ? (1) mp + m e = mc ? Me2 = 555 mp Pp ‘ RTp k + 1 kpn 2 (k + 1)/(k ? 1) (12) The area ratio of the nozzle throat and diffuser constant area        A1 Pc 1 = A3 Pp (1 + w )(1 + w (Te/Tp)) P2 1/k P (k ? 1)/k 1/2 1? 2 Pc Pc 2 1/(k ? 1) 2 1/2 1? k+1 k+1 1/2 (13) H. El -Dessouky et al. / Chemical Engineering and Processing 41 (2002) 551 – 561 556 ? The area ratio of the nozzle throat and the nozzle outlet A2 = A1 ‘  1 2 (k ? 1) 2 1+ M p2 2 M p2 (k + 1 2  ? (k + 1)/(k ? 1) (14) ? 3. Solution procedure ? Two solution procedures for the above model are shown in Fig. 2. Either procedure requires iterative calculations. The ? rst procedure is used for system design, where the system pressures and the entrainment ratio is de? ned. Iterations are made to determine the pressure of the motive steam at the nozzle outlet (P2) that gives the same back pressure (Pc). The iteration sequence for this procedure is shown in Fig. 2(a) and it includes the following steps: ? De? ne the design parameters, which include the entrainment ratio (w ), the ? ow rate of the compressed ? ? ? ? vapor (mc) and the pressures of the entrained vapor, ompressed vapor and motive steam (Pe, Pp, Pc). De? ne the ef? ciencies of the nozzle and diffuser (pn, pd). Calculate the saturation temperatures for the compressed vapor, entrained vapor and motive steam, which include Tc, Tp, Te, using the saturation temperature correlation given in the appendix. As for the universal gas constant and the speci? c heat ratio for steam , their values are taken as 0. 462 and 1. 3. The ? ow rates of the entrained vapor (me) and motive steam (mp) are calculated from Eqs. (1) and (2). A value for the pressure at point 2 (P2) is estimated and Eqs. (5) – (11) are solved sequentially to obtain the ressure of the compressed vapor (Pc). The calculated pressure of the compressed vapor is compared to the design value. A new value for P2 is estimated and the previous step is repeated until the desired value for the pressure of the compressed vapor is reached. Fig. 2. Solution algorithms of the mathematical model. (a) Design procedure to calculate area ratios. (b) Performance evaluation to calculate w. H. El -Dessouky et al. / Chemical Engineering and Processing 41 (2002) 551 – 561 ? The ejector cross section areas (A1, A2, A3) and the area ratios (A1/A3 and A2/A1) are calculated from Eqs. (12) – (14). The second solution procedure is used for performance evaluation, where the cross section areas and the entrainment and motive steam pressures are de? ned. Iterations are made to determine the entrainment ratio that de? nes the ejector capacity. The iteration sequence for this procedure is shown in Fig. 2(b) and it includes the following steps: ? De? ne the performance parameters, which include the cross section areas (A1, A2, A3), the pressures of the entrained vapor (Pe) and the pressure of the primary stream (Pp). ? De? ne the ef? ciencies of the nozzle and diffuser (pn, pd). ? Calculate the saturation temperatures of the primary nd entrained streams, Tp and Te, using the saturation temperature correlation given in the appendix. ? As for the universal gas constant and the speci? c heat ratio for steam, their values are taken as 0. 462 and 1. 3. ? Calculate the ? ow rate of the motive steam and the properties at the nozzle outlet, which include mp, P2, Me2, Mp2. These are obtained by solving Eqs. (5), (6), (12) and (14). ? An estimate is made for the entrainment ratio, w. ? This value is used to calculate other system parameters de? ned in Eqs. (7) – (11), which includes M*2, e M*2, M*, M4, M5, P5, Pc. p 4 ? A new estimate for w is obtained from Eq. 13). ? The error in w is determined and a new iteration is made if necessary. ? The ? ow rates of the compressed and entrained vapor are calculated from Eqs. (1) and (2). 4. Semi-empirical model Development of the semi-empirical model is thought to provide a simple method for designing or rating of steam jet ejectors. As shown above, solution of the mathematical model requires an iterative procedure. Also, it is necessary to de? ne values of pn and pd. The values of these ef? ciencies widely differ from one study to another, as shown in Table 2. The semi-empirical model for the steam jet ejector is developed over a wide ange of operating conditions. This is achieved by using three sets of design data acquir ed from major ejector manufacturers, which includes Croll Reynolds, Graham and Schutte – Koerting. Also, several sets of experimental data are extracted from the literature and are used in the development of the empirical model. The semiempirical model includes a number of correlations to calculate the entrainment ratio (w ), the pressure at the nozzle outlet (P2) and the area ratios in the ejector 557 Table 2 Examples of ejector ef? ciencies used in literature studies Reference [27] [32] [33] [31] [10] [24] [8] [34] pn pd 0. 9 0. 5 0. 7–1 0. 8–1 0. 85–0. 98 0. 85 0. 75 0. 75 0. 8 0. 85 0. 7–1 0. 8–1 0. 65–0. 85 0. 85 0. 9 pm 0. 8 0. 95 (A2/A1) and (A1/A3). The correlation for the entrainment ratio is developed as a function of the expansion ratio and the pressures of the motive steam, the entrained vapor and the compressed vapor. The correlation for the pressure at the nozzle outlet is developed as a function of the evaporator and co ndenser pressures. The correlations for the ejector area ratios are de? ned in terms of the system pressures and the entrainment ratio. Table 3 shows a summary of the ranges of the experimental and the design data. The table also includes the ranges for the data reported by Power [12]. A summary of the experimental data, which is used to develop the semi-empirical model is shown in Table 4. The data includes measurements by the following investigators: ? Eames et al. [8] obtained the data for a compression ratio of 3 – 6, expansion ratio 160 – 415 and entrainment ratio of 0. 17 – 0. 58. The measurements are obtained for an area ratio of 90 for the diffuser and the nozzle throat. ? Munday and Bagster [4] obtained the data for a compression ratio of 1. 8 – 2, expansion ratio of 356 – 522 and entrainment ratio of 0. 57 – 0. 905. The measurements are obtained for an area ratio of 200 for the diffuser and the nozzle throat. ? Aphornratana and Eames [13] obtained the data for a compression ratio of 4. 6 – 5. 3, expansion ratio of 309. 4 and entrainment ratio of 0. 11 – 0. 22. The measurements are obtained for an area ratio of 81 for the diffuser and the nozzle throat. ? Bagster and Bresnahan [14] obtained the data for a compression ratio of 2. 4 – 3. 4, expansion ratio of 165 – 426 and entrainment ratio of 0. 268 – 0. 42. The measurements are obtained for an area ratio of 145 for the diffuser and the nozzle throat. ? Sun [15] obtained the data for a compression ratio of . 06 – 3. 86, expansion ratio of 116 – 220 and entrainment ratio of 0. 28 – 0. 59. The measurements are obtained for an area ratio of 81 for the diffuser and the nozzle throat. ? Chen and Sun [16] obtained the data for a compression ratio of 1. 77 – 2. 76, expansion ratio of 1. 7 â⠂¬â€œ 2. 9 and entrainment ratio of 0. 37 – 0. 62. The measure- H. El -Dessouky et al. / Chemical Engineering and Processing 41 (2002) 551 – 561 558 ments are obtained for an area ratio of 79. 21 for the diffuser and the nozzle throat. ? Arnold et al. [17] obtained the data for a compression ratio of 2. 47 – 3. 86, expansion ratio of 29. 7 – 46. , and entrainment ratio of 0. 27 – 0. 5. ? Everitt and Riffat [18] obtained the data for a compression ratio of 1. 37 – 2. 3, expansion ratio of 22. 6 – 56. 9 and entrainment ratio of 0. 57. The correlation for the entrainment ratio of choked ?ow or compression ratios above 1. 8 is given by W = aErbP cP d ec (e + fP g ) p (h + iP jc) (15) Similarly, the correlation for the entrainment ratio of un-choked ? ow with compression ratios below 1. 8 is given by W = aErbP cP d ec (e + f ln(Pp)) (g + h ln(Pc)) (16) vapor compression applications. As shown in Fig. 3, the ? tting result is very satisfact ory for entrainment ratios between 0. 2 and 1. This is because the major part of the data is found between entrainment ratios clustered over a range of 0. 2 – 0. 8. Examining the experimental data ? t shows that the major part of the data ? t is well within the correlation predictions, except for a small number of points, where the predictions have large deviations. The correlations for the motive steam pressure at the nozzle outlet and the area ratios are obtained semi-empirically. In this regard, the design and experimental data for the entrainment ratio and system pressures are used to solve the mathematical model and to calculate the area ratios and motive steam pressure at the nozzle utlet. The results are obtained for ef? ciencies of 100% for the diffuser, nozzle and mixing and a value of 1. 3 for k. The results are then correlated as a function of the system variables. The following relations give the correlations for the choked ? ow: The constants in Eqs. (15) and (16) are given as follows P2 = 0. 13 P 0. 33P 0. 73 e c (17) A1/A3 = 0. 34 P 1. 09P ? 1. 12w ? 0. 16 c p Entrainment ratio Entrainment ratio correlation choked correlation non-choked ?ow (Eq. (15); Fig. 3) ? ow (Eq. (16), Fig. 4) ?1. 89? 10? 5 ?5. 32 5. 04 9. 05? 10? 2 22. 09 ?6. 13 0. 82 ?3. 37? 10? 5 ? ? 0. 79 a 0. 65 b ?1. 54 c 1. 72 d 6. 9v10? 2 e 22. 82 f 4. 21? 10? 4 g 1. 34 h 9. 32 j 1. 28? 10? 1 j 1. 14 R2 0. 85 A2/A1 = 1. 04 P ? 0. 83 c P 0. 86 p w (18) ? 0. 12 (19) The R 2 for each of the above correlations is above 0. 99. Similarly, the following relations give the correlations for the un-choked ? ow: P2 = 1. 02 P ? 0. 000762P 0. 99 e c (20) A1/A3 = 0. 32 P 1. 11P ? 1. 13w ? 0. 36 c p (21) A2/A1 = 1. 22 P ? 0. 81P 0. 81w ? 0. 0739 c p (22) 2 Fitting results against the design and experimental data are shown in Figs. 3 and 4, respectively. The results shown in Fig. 3 cover the most commonly used range for steam jet ejectors, especially in vacuum and The R values for the above three correlations are above 0. 99. The semi-empirical ejector design procedure involves sequential solution of Eqs. (1) – (14) together with Eq. (17) or Eq. (20) (depending on the ? ow type, choked or non-choked). This procedure is not iterative in contrast with the procedure given for the mathematical model in the previous section. As for the semi-empirical performance evaluation model, it involves non-iterative solution of Eqs. (1) – (14) together with Eq. (15) or Eq. (16) for choked or non-choked ? ow, respectively. It should be stressed that both solution procedures are indepen- Table 3 Range of design and experimental data used in model development Source Er Cr Pe (kPa) Pc (kPa) Pp (kPa) w Experimental Schutte–Koerting Croll–Rynolds Graham Power 1. 4–6. 19 1. 008–3. 73 1. 25–4. 24 1. 174–4. 04 1. 047–5. 018 1. 6–526. 1 1. 36–32. 45 4. 3–429. 4 4. 644–53. 7 2–1000 0. 872–121. 3 66. 85–2100. 8 3. 447–124. 1 27. 58–170. 27 2. 76–172. 37 2. 3–224. 1 790. 8–2859. 22 446. 06–1480. 27 790. 8–1480. 27 3. 72–510. 2 38. 6–1720 84. 09–2132. 27 6. 2–248. 2 34. 47–301. 27 344. 74–2757. 9 0. 11–1. 132 0. 1–4 0. 1818–2. 5 0. 18–3. 23 0. 2–4 H. El -Dessouky et al. / Chemical Engineering and Processing 41 (2002) 551 – 561 559 Table 4 Summary of literature experimental data for steam jet ejectors Ad/At Pp (kPa) Pe (kPa) Pc (kPa) Pp/Pe Pc/Pe w Reference 90 198. 7 232. 3 270. 3 313. 3 361. 6 1. 23 1. 23 1. 23 1. 23 1. 23 3. 8 4. 2 4. 7 5. 3 6 161. 8 189. 1 220. 1 255. 1 294. 4 3. 09 3. 42 3. 83 4. 31 4. 89 0. 59 0. 54 0. 47 0. 39 0. 31 [8] [8] [8] [8] [8] 90 198. 7 232. 3 270. 3 313. 3 361. 6 1. 04 1. 04 1. 04 1. 04 1. 04 3. 6 4. 1 4. 6 5. 1 5. 7 191. 6 223. 9 260. 7 302. 1 348. 7 3. 47 3. 95 4. 44 4. 91 5. 49 0. 5 0. 42 0. 36 0. 29 0. 23 [8] [8] [8] [8] [8] 90 198. 7 232. 3 270. 3 313. 3 361. 6 0. 87 0. 87 0. 87 0. 87 0. 87 3. 4 3. 7 4. 4 5. 1 5. 4 227. 7 266. 2 309. 8 59 414. 4 3. 89 4. 24 5. 04 5. 85 6. 19 0. 4 0. 34 0. 28 0. 25 0. 18 [8] [8] [8] [8] [8] 200 834 400 669 841 690 690 1. 59 1. 59 1. 71 1. 59 1. 94 1. 94 3. 2 3. 07 3. 67 3. 51 3. 38 3. 51 521. 7 250. 2 392. 3 526. 1 356 356 2. 0 1. 92 2. 15 2. 19 1. 74 1. 81 0. 58 1. 13 0. 58 0. 51 0. 86 0. 91 [4] [4] [4] [4] [4] [4] 81 270 270 270 270 270 0. 87 0. 8 7 0. 87 0. 87 0. 87 4. 1 4. 2 4. 4 4. 5 4. 7 309. 5 309. 5 309. 5 309. 5 309. 5 4. 7 4. 8 5. 04 5. 16 5. 39 0. 22 0. 19 0. 16 0. 14 0. 11 [13] [13] [13] [13] [13] 145 660 578 516 440 381 312 278 1. 55 1. 55 1. 58 1. 57 1. 59 1. 62 1. 68 5. 3 5. 3 5. 3 5. 03 4. 77 4. 23 4. 1 426. 5 373. 5 326. 280. 6 239. 9 192. 6 165. 1 3. 42 3. 42 3. 36 3. 21 3 2. 61 2. 44 0. 27 0. 31 0. 35 0. 38 0. 42 0. 46 0. 42 [14] [14] [14] [14] [14] [14] [14] 143. 4 169. 2 198. 7 232. 3 270. 3 1. 23 1. 23 1. 23 1. 23 1. 23 2. 53 2. 67 3. 15 4 4. 75 116. 8 137. 8 161. 8 189. 1 220. 1 2. 06 2. 17 2. 56 3. 26 3. 87 0. 59 0. 51 0. 43 0. 35 0. 29 [15] [15] [15] [15] [15] 29. 7 33. 5 37. 8 46. 5 2. 47 2. 78 3. 14 3. 86 0. 5 0. 4 0. 3 0. 27 [17] [17] [17] [17] 119. 9 151. 7 224. 1 195. 1 195. 1 186. 2 1. 7 2. 3 3. 9 1. 6 1. 9 2. 9 1. 8 2. 2 3. 3 1. 6 1. 9 2. 8 0. 62 0. 49 0. 34 0. 78 0. 64 0. 37 [16] [16] [16] [16] [16] [16] 2. 3 2. 3 2. 3 56. 9 38. 6 22. 6 . 3 1. 9 1. 4 0. 57 0. 56 0. 57 [18] [18] [18] 81 1720 1720 1720 1720 79. 21 116 153 270 198 198 198 57. 9 47. 4 38. 6 57. 7 51. 4 45. 5 37. 01 67. 6 67. 6 67. 6 121. 3 99. 9 67. 6 1. 02 1. 2 1. 7 143 143 143 143 560 H. El -Dessouky et al. / Chemical Engineering and Processing 41 (2002) 551 – 561 wide range of compression, expansion and entrainment ratios, especially those used in industrial applications. The developed correlations are simple and very useful for design and rating calculations, since it can be used to determine the entrainment ratio, which, upon speci? cation of the system load, can be used to determine the motive steam ? w rate and the cross section areas of the ejector. Acknowledgements Fig. 3. Fitting of the entrainment ratio for compression ratios higher than 1. 8. The authors would like to acknowledge funding support of the Kuwait University Research Administration, Project No. EC084 entitled ‘Multiple Effect Evaporation and Absorption/Adsorption Heat Pumps’. Appendix A. Nomenclature A COP Cr Er m M M* Fig. 4. Fitting of the entrainment ratio for compression ratios lower than 1. 8. dent of the nozzle and diffuser ef? ciencies, which varies over a wide range, as shown in Table 2. 5. Conclusions A semi-empirical model is developed for design and erformance evaluation of steam jet ejector. The model includes correlations for the entrainment ratio in choked and non-choked ? ow, the motive steam pressure at the nozzle outlet and the area ratios of the ejector. The correlations for the entrainment ratio are obtained by ? tting against a large set of design data and experimental measurements. In addition, the correlations for the motive steam pressure at the nozzle outlet and the area ratios are obtained semi-empirically by solving the mathematical model using the design and experimental data for the entrainment ratio and system pressures. The correlations cover a P DP R Rs T w cross section area (m2) coef? cient of performance, dimensionless compression ratio de? ned as pressure of compressed vapor to pressure of entrained vapor expansion ratio de? ned as pressure of compressed vapor to pressure of entrained vapor mass ? ow rate (kg/s) Mach number, ratio of ? uid velocity to speed of sound critical Mach number, ratio of ? uid velocity to speed of sound pressure (kPa) pressure drop (kPa) universal gas constant (kJ/kg  °C) load ratio, mass ? ow rate of motive steam to mass ? ow rate of entrained vapor temperature (K) ntrainment ratio, mass ? ow rate of entrained vapor to mass ? ow rate of motive steam Greek symbols k compressibility ratio p ejector ef? ciency Subscripts 1–7 locations inside the ejector b boiler c condenser d diffuser e evaporator or entrained vapor m mixing n nozzle p primary stream or motive steam t throat of the nozzle H. El -Dessouky et al. / Chemical Engineering and Processing 41 (2002) 551 – 561 Appendix B B. 1. Correlations of saturation pressure and temperature   The saturation temperature correlation is given by T = 42. 6776 ? 3892. 7 ? 273. 15 (ln(P /1000) ? 9. 48654) here P is in kPa and T is in  °C. The above correlation is valid for the calculated saturation temperature over a pressure range of 10 – 1750 kPa. The percentage errors for the calculated versus the steam table values are B 0. 1%. The correlation for the water vapor saturation pressure is given by  ln(P /Pc) = Tc ?1 T + 273. 15  8 ? % fi (0. 01(T + 273. 15 ? 338. 15))(i ? 1) i=1 where Tc = 647. 286 K and Pc = 22089 kPa and the values of fi are given in the following table f1 f2 f3 f4 ?7. 419242 0. 29721 ?0. 1155286 0. 008685635 f5 f6 f7 f8 0. 001094098 ?0. 00439993 0. 002520658 ?0. 000521868 How to cite Steam Jet Refrigeration Cycle, Essay examples

History Of Jazz And Classical Music (1751 words) Essay Example For Students

History Of Jazz And Classical Music (1751 words) Essay History Of Jazz And Classical MusicHistory of Jazz and Classical MusicUpon entering a modern record store, one is confronted with a wide variety of choices in recorded music. These choices not only include a multitude of artists, but also a wide diversity of music categories. These categories run the gamut from easy listening dance music to more complex art music. On the complex side of the scale are the categories known as Jazz and Classical music. Some of the most accomplished musicians of our time have devoted themselves to a lifelong study of Jazz or Classical music, and a few exceptional musicians have actually mastered both. A comparison of classical and Jazz music will yield some interesting results and could also lead to an appreciation of the abilities needed to perform or compose these kinds of music. Lets begin with a look at the histories of the two. The music called classical, found in stores and performed regularly bysymphonies around the world, spans a length of time from 1600 up to the present. This time frame includes the Renaissance, Baroque, Classical, Romantic and Contemporary periods. The classical period of music actually spans a time from of 1750 to 1800; thus, the term Classical is a misnomer and could more correctly be changed to Western Art Music or European Art Music. European because most of the major composers up till the 20th century were European. Vivaldi was Italian, Bach was German, Mozart and Beethoven were Austrian; they are some of the more prominent composers. Not until the twentieth century with Gershwin and a few others do we find American composers writing this kind of art music. For the sake of convention, we can refer to Western Art Music as Classical music. Jazz is a distinctively American form of music, and its history occupies a much smaller span of time. Its origins are found in theearly 1900s as some dance band leaders in the southern U.S. began playing music that combined ragtime and blues. Early exponents of this dance music were Jelly Roll Martin (a blues player) and Scott Joplin (ragtime). The terms Jazz and Jazz Band first surfaced in the year 1900. Some say this occurred in New Orleans, although similar music was played at the same time in other places. The most prominent exponents of this early music, called Dixieland Jazz, included Louis Armstrong and Sidney Bechet. After World War I, Jazz music had evolved and was aided by the development of the recording industry. Thesmall dance band ensemble grew into the larger orchestra known as the Big Band. The music of the Big Bands became known as Swing. Two of the more famous Swing band leaders were Tommy Dorsey and Harry James. In the late 40s and through the 50s, a different kind of Jazz became popular. This music, played by a very small ensemble, was much moresophisticated and complex . Its rich harmonic changes and melodic counterpoint were not conducive to dance. It became known as Bop, with Charlie Parker and Dizzie Gillespie being the early proponents. In the last twenty years there has been a combination of Jazz with popular music of the US and Latin America. This modern Jazz music has been called Fusion. Present day exponents include Pat Metheny and Chic Corea. There has also been a return to the sound of Bop in the last ten years by such musicians as trumpeter Winton Marsalis and his brother Branford, a saxophonist. Lets focus on the instrumentation of the two kinds of music. In Classical music, both large orchestras and small ensembles are used. But generally, the greatest and most prominent compositions are for the larger symphony orchestra. The largest part of the orchestra is the string section consisting of violins, violas, cellos and string basses. These instruments were invented very early in medieval times but really matured into their present form during the late 18th century. The wind instruments, comprised of brass and woodwinds, took longer to mature. The brass section in particular did not posses the ability to play chromatically (in all keys) until the advent of valves which allowed the length of the instrument to be changed while playing. This occurred around the middle to late 19th century. Consequently, the brass instruments are less prominent in the music of Bach, Mozart and Beethoven along with their contemporaries. Late 19th and early 20th century composers make use of a very large orchestra with all the fully developed wind instruments. Some of the master orchestrator/composers of this time were: Wagner, Rimskey-Korsakov, Ravel and Stravinsky. Currently, composers also make use of the full orchestra but with the addition of increasingly larger percussion sections which add many unique and unheard of sounds than in earlier music. Body Ritual Among the Nacirema EssayIn Classical music, modern listeners are mostly unaware of the fact that many of the great composers of the past were not onlyexcellent performers but also great improvisers. Starting with J.S. Bach (1685-1750), the greatest composer of the Baroque era, he in fact made his living through his great skill as an improvisor. It was common for the Lutheran Church organist of his day be able to improvise on choral melodies and Bach was considered one of the greatest at this. There are written accounts of other composers improvisational abilities including Mozart (1756-1791), Beethoven (1770-1829), and Franz Liszt (1811-1886). Yet, as time went on, improvising gave way to the composers desire to exert complete control over his music. By the late 19th century, improvising was rare and not used at all in public performances of classical music. In summation, we can say that Jazz and Classical music represent two approaches to Art Music. The Classical composer or performer has a long and rich body of music in written form that he uses to learn from while the Jazz musician uses a body of recorded music to learn. Because of its small size, the modern Jazz ensemble allows loose interaction while the symphony orchestras large size and diversity of instruments provides many different sounds and wide dynamic range. In classical music the composer strives for control; he uses printed music to guide and direct the musicians through the conductor. In Jazz music, the songs are loosely composed, thus forming a basis for individual expression within an ensemble. When you go to hear asymphony, you hear an orchestra conducted by the conductor playing a composition. When you go to a Jazz club you hear a small jazz ensemble interacting and improvising a song. Both of these kinds of music provide rich expression and detail to the serious lis tener. They take different paths to reach their final form but give a person equal opportunities to appreciate the creative output of each. Music Essays

Visual Basic Toolbox Controls Essay Example

Visual Basic Toolbox Controls Essay The Toolbox Controls The Toolbox window holds all of the controls available to your VB. NET programs. Basic Controls First, let’s focus on the basic controls that are used in most programs. These controls are so essential that VB. NET would be utterly useless without them 1- Button The Button control is a key ingredient for an effective user interface. Buttons are normally found on the main form of a program and are used to perform tasks or bring up additional forms for the user. Notable Properties Important Properties of Button1 from Properties  Window: Appearance Appearance  section of the properties  window  allows us to make changes to the  appearance  of the Button. With the help of   BackColor  and  Background Image  properties we can set a background color  and a background image to the button. We set the font color and font style for the text that appears on button with  ForeColor  and the  Font  property. We change the appearance  style of the button with the  FlatStyle  property. We can change the text that appears on button with the  Text  property and with the  TextAlign  property we can set where on the button the text should appear from a predefined set of options. Behavior We will write a custom essay sample on Visual Basic Toolbox Controls specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Visual Basic Toolbox Controls specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Visual Basic Toolbox Controls specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Notable Behavior properties of the Button are the  Enabled  and  Visible  properties. The Enabled property is set to True by default which makes the button enabled and setting its  property to  False makes the button Disabled. With the Visible property we can make the Button Visible or Invisible. The default value is set to True and to make the button Invisible set its property to  False. Layout With the  Location  property you can change the location of the button. With the Size property you can set the size of the button. 2- CheckBox The CheckBox control is a Boolean control that can be set to true or false. When the control’s value is true, the check box will be filled with a small x. Notable Properties Important properties of the  CheckBox  in the  Appearance  section of the properties  window  are: Appearance: Default value is Normal. Set the value to Button if you want the  CheckBox  to be  displayed  as a Button. BackgroundImage: Used to set a  background image  for the  checkbox. CheckAlign: Used to set the  alignment  for the  CheckBox  from a predefined list. Checked: Default value is False, set it to True if you want the  CheckBox  to be  displayed  as checked. CheckState: Default value is Unchecked. Set it to True if you want a check to appear. When set to Indeterminate it displays a check in gray background. FlatStyle: Default value is  Standard. Select the value from a predefined list to set the style of the  checkbox. 3- Label The Label control is used to display static labels on a form that generally don’t change while a program is running. The labels are commonly used alongside TextBox controls to describe the information sto red in the TextBox 4- LinkLabel The LinkLabel control is a specialized version of the Label control, which includes an Internet hyperlink so that when you click the label, the link is opened in the default Web browser (or e-mail program). RadioButton The RadioButton control is useless by itself because a mouse click can only set the value to true, not false (as is the case with CheckBox). RadioButton controls are only useful if two or more are placed together on a form or other container (such as a GroupBox), because they reflect a multiple-choice value as indicated by the selected con trol, not an individual true/false value. Notable Properties Important properties of the RadioButton in the  Appearance  section of the properties  window  are: Appearance: Default value is Normal. Set the value to Button if you want the RadioButton to be  displayed  as a Button. BackgroundImage: Used to set a  background image  for the RadioButton. CheckAlign: Used to set the  alignment  for the RadioButton from a predefined list. Checked: Default value is False, set it to True if you want the RadioButton to be  displayed  as checked. FlatStyle: Default value is  Standard. Select the value from a predefined list to set the style of the RadioButton. TextBox The TextBox control is a multi-purpose keyboard input and text output control capable of displaying multiple lines of text with automatic word wrapping. Some Notable Properties: Some important properties in the Behavior section of  the Properties  Window  for  TextBoxes. Enabled: Default value is True. To disable,  set the  property to  False. Multiline: Setting this  property to  True makes the TextBox multiline which allows to accept multiple lines of text. Default value is False. PasswordChar: Used to set the password character. The text displayed in the TextBox will be the character set by the user. Say, if you enter *,   the text that is entered in the TextBox is displayed as *. ReadOnly: Makes this TextBox readonly. It doesnt allow to enter any text. Visible: Default value is True. To hide it set the  property to  False. Important properties in the  Appearance  section TextAlign: Allows to align the text from three possible  options. The default value is left and you can set the  alignment  of text to right or center. Scrollbars: Allows to add a  scrollbar  to a Textbox. Very useful when the TextBox is multiline. You have four  options  with  this property. Options  are are None, Horizontal, Vertical and Both. Depending on the size of the TextBox anyone of those can be used

Muslim Women Essay Example

Muslim Women Essay Example Muslim Women Essay Muslim Women Essay The Convention on the elimination of all forms of discrimination against women (CEDAW) is a human right treaty for women. The basic structure of the organization is based upon three principles: equality, non-discrimination and state obligation. This organization has set some rules to eliminate discrimination against women. This organization set some specific rules which the state has to agree with and implement it on their state. POLITICAL REPRESENTATION Fatwas have been issued in some of the Islamic countries barring Muslim Women from participating in elections on the grounds that it will bring them into contact with men. Such Fatwas hardly had any impact on women and the Muslim voters; who promptly ignored them. A fatwa banning Muslim women’s participation in elections (as contestants) has also been issued with the rider that if they still participate in elections, they may do so wearing the veil. MARRIAGE RIGHTS The Muslim civil code has provided the Muslim man with a right to polygamy, though the prophet mentioned the subject only once. Moreover, a Muslim woman cannot marry a non-Muslim whereas a man can. Contrary to the general notion of equality, a husband is also granted a partial unilateral right of divorce. He can dissolve his marriage by uttering the word talaq thrice even without stating the reasons and in the absence of his wife who merely needs to be informed. On the other hand, a woman can divorce her husband only if: * An agreement is made before or after the marriage by which she is at liberty to divorce herself from her husband under certain specified conditions which are not opposed to the policies of Islamic Law. Unawareness about his whereabouts for 4 years. * failure to get maintenance for 2 years, * impotency, insanity of the husband, or if he is suffering from some venereal disease, * cruelty and option of puberty i. e. if she was married before the age of 15. RIGHTS OF A MUSLIM WIDOW ON HER HUSBAND’S PROPERTY * The widow has to give full account of all the income and profits of the estate. * She cannot sell or gift her property to anyone. * She can file a suit for the recovery of the mahr –debt. She can satisfy her mahr debt out of the rents and profits of the property. RAPE LAW According to the sunnah, a woman should not be punished for having been coerced into having sex. This attitude towards rape is discussed in the following hadith: During the time of Muhammad punishment was inflicted on the rapist on the solitary evidence of the woman who was raped by him. Wail ibn Hujr reports of an incident when a woman was raped. Later, when some people came by, she identified and accused the man of raping her. They seized him and brought him to Allahs messenger, who said to the woman, Go away, for Allah has forgiven you, but of the man who had raped her, he said, Stone him to death. (Tirmidhi and Abu Dawud). According to a  Sunni  hadith, the punishment for committing rape is death, there is no blame attached to the victim. According to  Al-Mawardi, an 11th century specialist in Islamic jurisprudence (sharia), if either the victim or a witness kills the perpetrator of rape during the crime, in order to prevent furthering the violence of the act, the killing is permissible and is exempt from the laws of murder and killing. However right now it is far from uncommon for a woman who raises claims of rape to be not only denied justice, but to be charged as a criminal herself for committing fornication or adultery. DRESS CODE Hijab  is the Quranic requirement that Muslims, both male and female, dress and behave modestly. The most important Quranic verse relating to  hijab  is  sura  , which says, And tell the believing women to lower their gaze and guard their private parts and not to display their adornment except that which ordinarily appears thereof and to draw their headcovers over their chests and not to display their adornment except to their [maharim] There are regional and sectarian variations of the veil associated with  hijab. Depending upon local views regarding female modesty, they may or may not cover the face or the eyes, or the entire body. These variations include: * Hijab  Ã¢â‚¬â€œ A scarf covering the hair. * Chador  Ã¢â‚¬â€œ A cloak covering the head and body, but leaving the face uncovered; worn by many women in Iran when outside the home. * Shayla  Ã¢â‚¬â€œ A long rectangular scarf, pinned or tucked at the shoulder, leaving the face uncovered; worn by many women in the Persian Gulf region. Khimar  Ã¢â‚¬â€œ A long rectangular scarf, covering the head, neck and shoulders, but leaving the face uncovered. * Burka  Ã¢â‚¬â€œ Covers the entire head and body, including the eyes; the wearer sees through a cloth mesh eye veil sewn into the burka. * Al-Amira  Ã¢â‚¬â€œ A two-piece veil that includes a close-fitting cap and a tube-shaped scarf covering the head and neck, but leaving the face uncovered. * Niqab  Ã¢â‚¬â€œ A veil that leaves the eye clear (although it may be worn with an eye veil), and worn with a headscarf. The  hijab, and the veil in particular, have often been viewed by many as a sign of oppression of Muslim women. The wearing of the  hijab  has become controversial in countries where Muslims are a minority, and where majority secular opinions regard the  hijab  as violating womens freedom, especially in Europe amid increasing immigration of Muslims In some countries where Muslims are a minority, there is much less public opposition to the practise, although concerns about it are discussed. Canadian media, for example, have covered controversies where concerns have been raised over the veil being a possible security risk, as in cases where Muslim women have refused to remove their  niqab  or  burkaveil for voter identification at polls. Case study: India SCHEMES FOR DEVELOPMENT OF MUSLIM WOMEN IN INDIA * Multi-Sectoral Development Project (MSDP) to rehabilitate Muslim women who are destitute or have been abandoned by their husbands. WEST BENGAL * Leadership development of minority women scheme. KSWWF(karnatka state wakf foundation for women development)-In the scheme Medical relief is provided to Muslim Minorities woman and girls for medical treatment. * Health Relief to Muslim Minorities Women and Girls- karnatka * Training of Muslim Women in Stitching, Embroidery and Knitting * Providing Computer Training to Minorities Muslim Women * Stipend to Muslim Minorities Girls learning Urdu DTP Course * Starting Pre-Primary School for Muslim Children by NGOs EMPLOYMENT OF MUSLIM WOMEN IN INDIA The constitution of India confers equal citizenship rights on all Indians and provides safeguards for minorities. Constitutional safeguards are meant to ensure the full and active participation of all communities including Muslims in the country’s public life. Article 14 of the Constitution grants equality to all citizens without discrimination on grounds of caste, language or religion.. Muslim women have the lowest work participation rate (WPR) among all three categories of work, with a large gap between the WPRs for Muslim women, Hindu or Christian women. Sixty percent of Muslim women are self-employed – the highest percentage among all three religious categories i. e. Hindus, Christians and Muslims. The living conditions are linked with to the employment patterns and working conditions and the worker population rates for Muslim women are lower than for women in other socio-religious category (SRC). Most of the Muslim women are self employed; they prefer to work at home. As compared to other SRCs, Muslims are concentrated more in self-employed activities and their participation in regular jobs, especially in non-agriculture is much less than for others. A significantly higher share of Muslim workers in self-employment can be seen in urban areas as compared to rural are areas and for women who prefer home-based activities. The share of Muslims in regular work, especially in the government, public sector and large private sector is very low. LIVING CONDITIONS OF INDIAN MUSLIM WOMEN Muslim women are suffering from both internal and external oppression. Muslim men practice what they themselves believe is Islamic and oppress their women and refuse to entertain any thought of change. Many educated Muslim women thus start believing there can be no liberation within Islam and seek their freedom through secular laws. Ultimately, the source of their oppression is sought to be located in Islam itself, which is projected as an allegedly patriarchal religion, supposedly hostile to women’s rights and gender-justice. Wearing of Hijab and Burqa is still in practice in India. So, to conclude, Muslim legal traditions in India, for women have developed to an extent, but the society still remains orthodox and conservative. Muslims are still in minority. Various welfare schemes for the development of Muslim Women have been introduced and the country. . Case study: gulf countries In Gulf countries, following is the prevalent tradition: Education Progress on bridging the gender gap in social indicators has been impressive in Gulf Countries, mainly because of heavy public sector investments in education and health sectors, from which women have benefited significantly. Gulf countries has made substantial gains in the education of women. Statistics show that girls are equal to boys in tertiary, secondary and primary level of education in Gulf countries and 60% of all university students in the six states of the Gulf are women. Employment Women in the Gulf countries had been influenced by societys traditions. Their economic participation and their status position are become low and weak in comparisons with their life at the begging of Islam. Nevertheless, Gulf women have played a role in for as long as these societies have existed, through their effective role in the family and in their tribes, and supplementing the family income with a little local trading or through weaving and handicrafts and agricultural work and in some cases fighting beside their men. Nowadays, women in the Gulf are at the forefront of the economic life of their societies, in the labor force, in politics, in civil organizations, and, in that most crucial area of life, in economics. Gulf countries remain a patriarchal society. Saudi Arabia forbids Muslim women even to drive. , Women earlier weren’t allowed to go to mosques because of fears of unchastity caused by interaction between sexes; this condition persisted until the late 1960s. Since then, women have become increasingly involved in the mosque, though men and women generally worship separately. Dress code and covering the full body, specially for the young women is still very strictly to be followed in some of the Gulf countries. The primary aim of women is not to earn money, but to look after her family, therefore, employment is still less in the gulf countries, even after gradual increase over decades. 1 . http://webspace. webring. com/people/gh/husociology1/1/muslimwomen2008. pdf [ 2 ]. pucl. org/from-archives/Gender/muslim-women. htm [ 3 ]. indianexpress. om/news/west-bengal-plans-scheme-to-aid-muslim-women/979145 [ 4 ]. http://articles. timesofindia. indiatimes. com/2013-01-06/lucknow/36173792_1_minority-women-muslim-women-sachar-committee [ 5 ]. http://kswwf. com/schemes-for-muslim-women. html [ 6 ]. unhcr. org/refworld/pdfid/469cbfcc0. pdf [ 7 ]. iimahd. ernet. in/assets/snippets/workingpaperpdf/12051717332012-09-03. pdf , pg-20 [ 8 ]. csss-isla. com [ 9 ]. ummid. com/news/2010/January/03. 01. 2010/socio_cultural_impediments_to_muslim_women. htm

Eternal Sunshine of the Spotless Mind Essay Example | Topics and Well Written Essays - 1000 words

Eternal Sunshine of the Spotless Mind - Essay Example Thesis The movie reflects modern cultural and social phenomena through the lens of gender constructed along sexuality and gender inequalities. In the essays, Susan Bordo (2003) proposes a unique vision and interpretation of modern culture and gender relations between opposite sexes. She criticizes a "material" and gendered body supposing that sexualized images of women make them victims of male oppression and violence, and "sex objects". Also, the author talks about such things as "standardized visual images' and gender stereotypes, "complex crystallizations of culture" which have a significant influence on modern audience. The prestige of the individual self-reached an all-time high when new social arrangements and events dramatized the relative powerlessness of the individual leading to a devaluation of the self. The movie takes place at the beginning of 21st century in New York. It vividly reflects modern culture and values, human relations and hopes. During this period of time, gender roles and sexual relations have a great influence on the society as it is often designed to add psychological value to its existence; it plays a more important communications role in every day life than any another activity: politics or economics. It is possible to say that sexual relations (depicted between Joel and Clementine, Stan and Mary) control the circulation of ideas in modern culture. The movie is based on the idea that new gender roles and new wave of feminist movement has changed identity and the role of women in the society. New ideas and values are inherent in modern culture based on technological innovations and the Internet, globalization and the popular global culture (Jarvis, 2000). The historical context of the movie has a great impact on production and perception of its context reflected in circulation of ideas and values. Viewers understand that through a complex interaction of identification processes such as love and fear, pain and haltered between the main characters, gender differences are produced--typically in the form of a dichotomy that not only opposes masculinity to femininity but also translates these oppositional differences into gender hierarchy, the privileging of traits and activities defined as masculine over those defined as feminine (Bordo, 2003). Through a gender-sensitive lens, the storyteller portrays how constructions of masculinity (agency, control, aggression) are not independent of, but rely upon, contrasting constructions of femininity (dependence, vulnerability, passivity) of Clementine and Mary. The whole span of development, from the explosive emotions of his youth to the skeptical mysticism of his middle age, is encompassed by the desire to play a game with his life and death. Joel fits very closely in with these ideas; he is a man trapped by a conventional notion of what is 'right' and 'wrong'. The composition of the movie supports its unique interpretation of events and gender roles creating a circle of events which forces viewers to rethink and re-interpret them time and again. The film employs reverse chronology structure that depicts relationships between Joel and Clementine in reverse order, from the most painful moments to happier times. This structure helps audience to focus on the memories and emotions of the heroes and understand the essence of their relations. It is possible to assume that such chronology is used to

Europes Attitude in the Middle East Essay Example | Topics and Well Written Essays - 1250 words

Europes Attitude in the Middle East - Essay Example They want now corruption, nepotism and all the ill wills of the societies to be halted. Importance of connections with the rest of the world and a sense of fell of proud for being citizens to their countries have been recognized by people. This can show a picture of wrong policies that have been pursued based on historic evidences which often neglected the perspectives of modernization and change (Meral 2011). This paper analyses the issues prevailing in the Middle East today and importance of such issues to the United States. It is also argued hereby whether the United States’ policy agenda will address the Middle East issues in favor of the US interests, and what role can Europe play in order to take advantage of social and economic opportunities. All these issues will help to have an idea of future of the Middle East in terms of stability and democracy. The United States’ dominance in the Middle East and North Africa is not a new phenomenon. It has been determined by examining that the United States has been the unrivaled power in the region since the end of the cold War. Today the Arabs are becoming more independent which has caused the situation of power of the United States in the region to change as that was before. The evidence of the changing situation in Middle East can be provided by Egypts decision to establish relations with Iran and Hamas which cannot even be altered by the United States. A new democratic Arab world is soon to be emerged now. The revolutions in Tunisia and Egypt have been the most peaceful in the Middle East region. There are other examples of this kind also such as an upholding rebellion in Yemen, an insurgence against Muammar Gaddafis dictator rule in Libya and a serial of protestations in Syria. Almost nobody could have foreseen the changes to come.

Ideas And Themes In Writings English Literature Essay

Ideas And Themes In Writings English Literature Essay Writers use lots of literary techniques and features to support their ideas and themes in their writings.All those tehniques are design to manipulate and shape the readers perceptions.They position readers to respond to the writing in certain ways,either agreeing with or disputing those themes.Themes of allienation,nostalgia to love and loss are very often repeated in Literature.We can see this very clear in three short stories which I would like to write about , Erneast Hemingways Hills Like White Elephants,John Cheevers The Enormous Radio and Doriss Lessing To Room Nineteen.In first story Hemingway tells us about inabillity to communicate effectively in a relationhip.Main characters got a huge difficulty in articulating their feelings which makes them frustrated with each other.In The Enormous Radio we see themes such as addiction and loss of control,hidden secrets ans scandals and communication issues but they all lead to the main theme of this story which is loss of love.Last Dor is Lessing story themes are theme of allienation,identity issue and loss of sense of being.Main character of this story,Susan is portrayed as a prisoner of ideology driven by sociaty that women are expected to be gladly and willingly acepting their repression and bondage. Narrative point of viewe is one of the first techniques which has huge influence on meaning and tone of the story.All stories are written in the same a third person point of viewe but with a little difference between them.Erneast Hemingway wrote Hills Like White Elephants in third person point of view and objective which is limited to what characters say and do.He doesnt reveal their thoughts ang feelings,as a readers we need to guess that by interpreting the text.In Enormous Radio we see that narrator use the same third person point of viewe but its omniscient.He is able to describe not only each characterà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ãƒ ¢Ã¢â‚¬Å¾Ã‚ ¢s actions but also their inside emotions,motives, and feelings.Sometimes narrator even takes subjective approach by describing one of the characters Irene as a self-centered women which is only concerned about how people viewe her and by describing Jim as a loyal and hard working man who tries very hard to give her and their children a comfortable life.In Doriss Lessings To Room Nineteen story starts from the third person narrative point of viewe only to shift later in a story to first person point of viewe.Lessing uses stream of concioussness techinque and interior monologue which creates the impression for the reader that he is almost eavesdropping on the flow of concious experience in characters mind.This give a reader an acces to thoughts,emotions and sensations experienced by a character. Varied details of setting and character has got a huge contributon to the maning of these short stories.Setting plays the biggest role in Hemingways story where even the title refers to symbolical importance of it.Jig,one of the characters of a story,by describing the hills that they look like white elephants refers to her pregnancy and the main issue of this story which is abortion.She describes the hills in the distance that they look like white elephants because American which she travells with,views the baby as an aproaching obstacle to their careless life.The rest of a setting also provides symbolism which express the tension and conflict between the couple.The train tracks going into two different directions,in between which couple sits at the train station might refer to couple being in the middle of making drastic decision. A couple is just like those tracks which run side by side but will never have a chance to meet. Different kind of land on both sides,on one green and fert ile and on the other dry and without trees also describes their different viewe and interpretation of the dilemma of pregnancy.In The Enormous Radio,the arrival of the new radio which changes its setting,going deeper in the house,moving from the door to the middle of the living room behind the couch because of its physical ugnliness it seems to be like agressive intruder,intruding Irenes life.By listening to the radio which picks up noises and conversations from the whole building she also starts intruding on other people lifes.This is how we start to see huge change in Irene and her relationship with Jim.She gets involved in people lives heard on the radio so much she soon became depressed and changes from a pleasant, rather plain woman to a woman who doubts who she is and doubts in her relationship with her husband.They both start to realise there is a tension in their marriage,that Irene has many dark,deep secrets which she has hidden very well all these years and which she feels guilty about.Setting its not so important in this story.Narrator is trying to concentrate only on the radio,voices and music coming out of it which plays huge role in a story by shaping atmosphere of a story and also changing mood of a main characters.The same we will see in Doris Lessings story where there is less description on setting but this minimalism have huge importance for the meaning.This minimalism gives the reader a sense of unfulfilled emptiness of a relationshp between Susan and Matthew and emptiness in Susans life which is described as a desert which shows her hopelessness and depressesion.Also the empty room nineteen which in she spends most of a time describes Susans need of allienation. Use of techniques such as irony,symbolism an understatement by wrtiers in those short stories has got a huge impact on themes.The most important in those stories is symbolism which is a use of symbols to represent or suggest other things or ideas.As said before in Hills Like White Elephants we can already see symbolism in the title of a story.Jig refers to the hills that they look like white elephants to talk about abortion which is the main theme of this story.A white elephant is a largely useless object that is expenssive to own and maitain which symbolise a unborn baby.The whole symbolism of a setting is important in many ways which I already had a chance to analyse earlier.The rail tracks could symbolise Jigs and Americans relationship and being in the middle of making an important decision.Two sides of a station described in a story has its own meaning,green can by a symbol of life, baby, a new beggining and dry side can represent death and abortion.Irony in this story mainly sh ows Jigs frustration towards the American and this is its main purpose.In conversation between them about licuorice and its familiar taste we can clearly see Jig is not only refering to a drink but also to their lifestyle which she is able to abandon at any point to settle down.I believe huge impact on the story has the last sentence spoken by Jig,when she tells the American she is fine.We can understand this sentence as an irony and that Jig will go through with the abortion because of her inability to communicate her feelings to the American wich leaves her frustrated and not being able to fight anymore.Also conversation between them,about such an important subject which is abortion,seems to be very simple,trivial and even pointless.The talk about good drinks and lovely hills is only a cover for a deadly argument.This tehnique used by Hemingway is called understatement.Again symbolism is used in Johns Cheever The Enormous Radio.It is mainly used to describe the hidden meaning of t he radio from the title.It symbolise an addiction and loss of control.Irene gets so obssesed with listening to her friends and neighbours on the radio that she is not even interested anymore in her relationships with other people in real life.She prefers to go home and eavsdropp on them through the radio.Radio also symbolise a hidden secret and scandal.When Irene start to doubts happiness of her marriege,all secrets are being revealed like theft and abortion, which she was hiding all these years.Radio is also used as an irony.It was purchased to bring joy and happiness to Irenes and Jims life but it only caused trouble between them revealing deep and dark secrets.In To the room nineteen again we can find symbolism in the title of a story.We see Susan as a woman who has been caught up in the web of the social roles in a community and she is trying to step out of this world into a world of her own making which is room nineteen.She is no longer a wife and mother in this room,she escape s her social role and she finally finds peace and freedom.We can see an irony in words describing Susan and Matthew as intelligent which is the very characteristic that is their downfall.Although they do everything sensibly in their minds, their repression of her as a woman is anything but intelligent.Also Lessing use repetition technique, using word intelligence fiftee times to make an irony even stronger. Dialogues,conversations between characters have also big impact on the meaning of those stories.Hemingway story is told in third person point of viewe and it doesnt tell us any facts about characters.This is why dialogue is important and we need to interpretate it to find out about attitudes oh the main characters towards each other.Their are able in this way to speak for themselve and we can also see through the tone and pattern of the dialogue,exsistence of a deep problem in their relationship.In The Enormous Radio dialog has the same purpose.We are able through dialogue to find out more about characters thoughts and feelings.We also in a dialogue see a tension between main characters,which bilds up towards the end of the story.In the To Room Nineteen Doris Lessing we can see through dialogues between Susan and Matthew the lack of communication in their married life.Lessing also use interior monologue to stress the meaning of the story.Through Susans interior monologue we can see h er helplensness and emptiness of her marriage life. All those strories got their own specific structure which has an impact on the mood and atmosphere of these stories.In Hemingways Hills Like White Elephants setting frames the story,it plays a crucial role in determining the atmosphere in his work. The choice of a setting and objects supports the sytuation and develops the story conflict.Also dialogues are holding the story together,they tell us about the main theme of a story.In The Enormous Radio music frames the story, creates the mood and reveals the emotional transition of the characters.In To Room Nineteen Doris Lessing is using more literary techniques in her writing to support the meaning. Narrator by changing the tone of language creates a mood.At the beggining of a writing words are longer which makes reading slower and creates very peacfull effect.But than towards the end of a story narrator is trying to create tension in a story and starts using shorter words which makes our reading much quicker.Also stream of conciousnes s technique adds dramatic effect to the story and without it writing would be very bland. I have really enjoyed reading short stories,especially those three which I have chosen for this evaluation and analysis.Mainly I believe so because of female issues in sociaty presented in those stories.Earnest Hemingways Hills Like White Elephants is deffinitelly my favourite.It is very interesting that narrator doesnt reveal any informations about characters,what they think and feel.To find out we need to interpretate the text,in this case dialogue between them.Through reading the story I felt like sitting next to the couple,eavsdropping on their conversation.Because there is a huge communication issue between them and they are unable to reveal their true feelings again it is left to the reader to analyse what characters are really thinking.It also intrigued me how story shows a contrast between male and female viewe on relationsips.When abortion for Jig,killing their unborn baby is a huge decision for her,for American is only a simple operation letting the air in.He doesnt identif y himself with the baby which is an obstacle for him and his careless lifestale. I also found The Enormous Radio very interesting to read.I think John Cheever through this story again proved the fact how communicating issues between people might affect their relationship.Irenes secrets and scandals creates tension between their marriage and they lead to loss of trust and love between them.The structure of a story has also catched my attention.I found it very interesting that music was creating the mood in the story and that music was revealing the emotional transition of the characters.In To Room Nineteen I was hugle intrested in Lessings attitude towards female repression, alienation and escape which is all exposed in this story.She tries to explain how social, cultural, and ethic diversions,how they all limit women perspectives and experiences and their intellectual, spiritual, and emotional freedom.By indroducing us to the main character Susan,which entire exsistence was like pri son,she tells us that this allienation might even result in mental breakdown.Short stories are very quick and enjoyable reading but still they have a huge depth and important message hidden in them.I would deffinitely recomend to others short stories which I had a chance to read and I will also continue to expand my experience as a reader.