Nuclear power Essay Example | Topics and Well Written Essays - 500 words

Nuclear power - Essay Example Thermal reactors are common in many nuclear plants in the world since they mainly use thermal fission. Thermal neutrons move within thermal equilibrium at a temperature of about 550F, corresponding to a velocity of 3700 meters per second (Virtual Nuclear Tourist 1). On striking a uranium- 235 nucleus with the fuel, the nucleus sometimes split or fission into two unequally sized nuclei known as fission fragments. The fission products comprise large positively charged particles of elements such as Iodine or Strontium. The fission products slow down immediately and producing heat in the fuel. Moreover, 2 and 3 neutrons are produced in the process. The moderator decelerates the neutrons to the thermal energy. Neutrons do not travel very far within the reactor. They are generated from fission in the fuel, jump around in the moderator, then lose a large amount of their energies and later causes fission (Virtual Nuclear Tourist 1). The aim of nuclear fission is to generate heat. Thus, the coolant removes the heat and maintains the temperature of the fuel within tolerable limits (Virtual Nuclear Tourist 1). It also cools the moderator, which can also be used to cool the fuel. In some cases, it also cools the fuel by moving round the rods holding the fuel. The fuel within the reactor exists in the form of pellets of made of uranium dioxide or metal dioxide. There exists two or more isotopes of uranium and includes U- 235 and U 238 (Virtual Nuclear Tourist 1). U -238 is common in nature and has 146 neutrons and 92 protons. The remaining portion comprise of U – 235 and U 234. In commercial nuclear reactors, the fuel has a higher concentration of U- 235 compared to the level found in nature. It will undergo thermal and fast fission when struck by neutrons. Consequently, U – 238 will also undergo fission when struck by quick moving neutrons of specific energies and can in some case absorb

Movement and Positioning in Stroke Patients Essay

Movement and Positioning in Stroke Patients - Essay Example The effects of stroke can be divided into two categories: impairments and disabilities. Impairments are changes in the body structure and function. Disabilities, on the other hand, are limitations in the performance of the activities of daily living. These can be affected not just by the physical effects of the disease, but by psychological and social factors.Impairments and disabilities can worsen with time if no intervention is done. It may lead to further deterioration due to immobility or reduced activity, leading to complications such as thrombus formation, decubitus ulcers, and pulmonary embolism. Patients may also become more dependent on others and have decreased normal social interactions. All of these can have a profound effect on a person’s well-being. Backe, Larsson, and Fridlund (1996) investigated how patients conceived their life situation during the first week after the onset of stroke. They uncovered deep psychological trauma in the patients, wherein they had feelings of unreality, awareness of a changed role in life, feelings of a changed perception of the body, and feelings of being confused. Patients were also found to have a heightened sense of loss of capability and awareness of living in a confined space. Fortunately, some patients also developed an appreciation for the importance of support and encouragement and a will to look for new opportunities after the onset of stroke. One of the important debilitating effects of stroke is immobility. ... It also discusses the role of nurses in the management of stroke patients and in rehabilitation programs. It concludes with learnings from the literature review and critical appraisal and recommendations on how to apply these to nursing practice. The Importance of Movement and Positioning Stroke as a disease process can be progressive. Even though the cerebrovascular event that leads to the neurologic deficits is acute, its sequelae can continue to build on each other, leading to progressive deterioration of the patient. One important example of this is immobility. Due to neurologic deficits, a patient may have difficulty moving. This can lead to development of contractures, muscle atrophy, and nerve palsies (Summers et al., 2009). Current practice advocates early mobility for stroke patients. Summers et al. (2009), in their statements regarding the comprehensive care of the acute stroke patient, recommends that stroke patients may be initially kept on bed rest but should be mobilize d once hemodynamically stable. It has been found that early mobilization reduces the risk of atelectasis, pneumonia, DVT, and pulmonary embolism. Aside from early immobilization, a longer term rehabilitation program has also been found to be effective in stroke patients. Ernst (1990) reviewed the literature on rehabilitation and physiotherapy among stroke patients and found that it was associated with improvement in functional status and lower incidence of secondary complications such as pneumonia and ulcers. Furthermore, Gordon et al. (2004) found in their review of literature that aerobic exercise can enable activities of daily living to be performed

The Perfect Pizzeria Essay Example for Free

The Perfect Pizzeria Essay Please answer the following questions applying OB concepts and theories as appropriate. While the case primarily focuses on motivational approaches, you find that other OB concepts that we have covered are applicable. 1. Consider the situation where the manager changed the time period required to receive free food and drink from six to twelve hours of work. Apply the appropriate motivational approaches (theories) to explain what happened. 2. For the situation in which the manager worked beside the employees for a time and then later returned to his ofï ¬ ce, which motivational and/or learning approaches (you may refer to previous chapters) can be applied to explain what happened? 3. Establish and justify a motivational program based on one or a combination of motivation theories to more effectively deal with the situation as it exists at the end of the case.

Problems Faced By Chinese Students

Problems Faced By Chinese Students This current research is titled as Problems faced by Chinese students in learning English language: A case study of S.M. Pei Yuan KAMPAR. This chapter consists of nine sections which is background of the study, statement of problem, purpose of study, significance of study, research question, scope of study, methodology, limitation and definition of key words. Background of the study Learning English language as second language (L2) is a big challenge for second language learners. Students still have problems with grammatical functions most of the time, although they have 11 years of English language exposure. Hence, this study focuses on the first language (L1) grammatical functions that interfere with Chinese learners of English as a second language. In Malaysia, there are numerous learners who have Chinese language as their L1. Most of them have problems in learning English language especially the English grammar. Learners are more or less likely to be influenced either positively or negatively by their first language. According to Hassan (2002), learners L1 background knowledge will affect them in learning English language especially in speaking and writing. As a result, the interference of L1 has become the major problem for Chinese ESL learners in the process of learning English especially in writing. Chinese ESL learners will get interference from their L1 when they write. It is because they will get influence by their L1 grammatical structure. Besides, the differences of syntactic between L1 and L2 also will affect them in writing. A few studies have reported that Chinese ESL learners will use their mother tongue to plan an outline before writing (Cumming, 1989; Jones Tetroe, 1987), transfer the writing context to English language by using their mother tongue (Edelsky, 1982; Friedlander, 1990; Lay, 1982). Second language learners will use their mother tongue in such circumstances and the interferences from L1 to L2 can either be positive or negative. Learners L1 will influence In this study, researcher will examines mother tongue influence on Chinese learners 1.2 Statement of Problem To learn English as second language, learners at least have to master four basic skills which are listening, reading, speaking and writing. However, seldom Chinese ESL learners can fully master the skills especially in writing. It is because the L1 interferes of English Language causes grammatical errors in the writing process. According to Nik Safiah (1978), this kind of grammatical error can be obviously found in Chinse ESL learners essay writing. The differences between L1 and L2 grammatical funtions intefere on students English essay writing process. As we know that mastering English Language is not an easy task especially for learners who study in Chinese independent schools. It is because they mostly will get inteferenced from their L1 and affect the way they learn English. As a result, Chinese learners will face difficulty in learning English grammatical functions such as tenses, subject-verb agreement or countable and uncountable nouns. Although Chinese learners have exposed to English language since primary one, the errors still occur. Chinese ESL learner make this kind of grammatical errors because they do not fully utilize the language even though they are able to use it. As the saying goes, practise makes perfect if the learners do not polish their English language even with years of exposure to the language, it will make no different. 1.3 Purpose of Study The purpose of this study is to find out if L1 interference have a significant effect on Chinese ESL learners English essay writing. Besides, this study is also to identify types of errors that Chinese ESL learners commonly make with English grammatical functions in the English essay writing. 1.4 Significance of Study Although learners learn English since the first day enter they school. However, most of them cannot fully master English as their second language. This study can help teachers to understand the problems that learners face when they are learning English. Besides, teachers can identify the influence of learners L1 in learning English and among the errors, they help to correct the grammar. This can help to reduce the inteference of L1 from happening to students learning English. 1.5 Research Questions Based on the problems and purpose mentioned in the earlier sections, this study will focus on two research questions which are: Does L1 interference have a significant effect on Chinese Learners English essay writing? What types of errors do Chinese ESL learners commonly make with English grammatical functions in the English essay writing? 1.6 Scope of Study The aims of this study is to identify the inteference of learners L1 in learning English language. Learner who study in S.M. PEI YUAN (P) KPR would be chosen as participate in the writing test. This study is using purposive sampling because only one class of Chinese ESL learners will be selected as participants. 1.7 Methodology This study will utilize a test to find out why Chinese ESL learners have problems in learning grammar. The learners will be asked to write a short essay. The topic of the essay is My family and learners have to write around 100-120 words each. This test will be distributed to the learners during their classes. Thus, they will take the test seriously and the results of the data collected will be more precise. 1.8 Limitation This study is designed for those whose first language is not English language and have L1 background knowledge. The survey will only be conducted with one class of learners who study in S.M. PEI YUAN (P) KPR. Thus, the result do not represented all Chinese ESL learners. 1.9 Definition of key words Inteference learners make an error in ther L2 which influnced by their L1 (Lott,1983:256).

Attention Deficit Hyperactivity Disorder: Neurobiology of a Disorder or

Attention Deficit Hyperactivity Disorder: Neurobiology of a Disorder or a Difference? Attention Deficit Hyperactivity Disorder (ADHD) is a phrase that has moved out of the realm of pure science or psychology and into common parlance. Like depression, the public has a general and vague sense of the "type" of person who may have ADHD, and has heard the name Ritalin, the main drug used in treatment, bandied about. As the name of the disorder implies, its symptoms present generally as "inattention and a combination of hyperactive and impulsive behaviors" (2). ADHD has only recently been able to be tangibly identified in the nervous system, and its' diagnostic criteria has continued to be revised. The discovery of specific physiological differences in the brain has enabled scientists to correlate the behavioral symptoms associated with ADHD with specific differences, mutations, or malfunctions in the brain. Though the scientific burden of proof cannot be ignored, the way in which we choose to define these differences as a "disorder" is debatable. Given both the scientific understanding of the sheer size of the nervous system and the more poetic notion of individuality, the neurobiological differences associated with ADHD are difficult to adequately define within the unlimited permutations of human personalities. The current official American criteria for diagnosing the condition of ADHD, according to the DSM-IV, is based on a child presenting at least six symptoms of inattention, hyperactivity-impulsivity, or both, that have persisted for at least six months (3). Additionally, some symptoms must have been present before seven years of age, and some type of social, academic or occupational impairment must result from these symp... ...//www.sciam.com/missing.cfm 3) DSM-IV diagnostic criteria http://www.mentalhealth.com/dis1/p21-ch01.html 4) fabulous paper by Bonnie Craymond linking ADHD and the creative personality http://borntoexplore.org/adhd.htm 5) article from "The Medical Post" by Harvey McConnell http://www.mentalhealth.com/mag1/p5m-add2.html 6) great graphic http://www.sciam.com/missing.cfm 7) pharmacology information on Ritalin http://www.mentalhealth.com/drug/p30-r03.html 8) list of myths and corrections about ADHD http://www.add.org/content/abc/myths.htm 9) article from "Time" by Claudia Wallis http://www.mentalhealth.com/mag1/p51-adhd.html 10)"Scientific American" article by Kristin Leutwyler http://www.mentalhealth.com/mag1/p51-adhd.html 11) part of Barkley article diagramming a psychological model of ADHD http://www.sciam.com/missing.cfm

American Women and Community

Prior to Aug. 26, 1920 women in the United States could not participate in the democratic process. Following the Civil War, American women wanted to have more input into the decisions that would impact their lives. In order for women to gain suffrage groups across the nation had to gather together and create a unified effort for change. The Seneca Falls Convention of 1848, the first formal conference for woman’s suffrage, challenged America to a revolution that would endure for more than seven decades before women actually were granted the right to vote.Convened by Elizabeth Stanton and Lucretia Mott, the conventions aim was to empower women and invoke change through suffrage for women. Since the Civil War women had begun to feel the need to represent themselves and be able to participate in the decision making process which would affect their daily lives. â€Å"The catalyst for this gathering was the World Anti-Slavery Convention held in 1840 in London and attended by an Ame rican delegation which included a number of women. In attendance were Lucretia Mott and Elizabeth Cady Stanton, who were forced to sit in ther galleries as observers because they were women.This poor treatment did not rest well with these women of progressive thoughts, and it was decided that they would hold their own convention to discuss social, civil and religious rights of women, (, 2008,  ¶ 3). † The community of women who gathered in 1848 faced their first challenge in 1869 when the 15th amendment, which extended the right to vote to African-American men, was introduced and passed. â€Å"During the civil war, women’s suffrage was eclipsed by the war effort and movement for the abolition of slavery. While annual conventions were held on a regular basis, there was much discussion but little action.Activists such as slave-born Sojourner Truth, Elizabeth Stanton and Susan B Anthony lectured and petitioned the government for the emancipation of slaves with the belie f that, once the war was over, women and slaves alike would be granted the same rights as white men. At the end of the war, however, the government saw the suffrage of women and that of the Negro as two separate issues and it was decided that the Negro vote could produce the immediate political gain, particularly in the South, that the women’s vote could not, (, 2008,  ¶ 6). †Some women felt that they should support the 15th amendment as a victory which would bring women one step closer to voting. This faction of women’s suffrage supporters believed that after black men gained the right to vote there would be no barriers preventing women from gaining that right as well. Yet another faction felt that they could not endorse the amendment until they had been granted the right themselves. Two groups emerged, the National Woman Suffrage Association and Woman’s Suffrage Association. Both groups worked toward suffrage as well as securing property rights for mar ried women and other institutional changes.Following the Civil War, women’s study groups flourished. These groups gave women access to education and an intellectual forum. By the early twentieth century communication was also more effective and women across the nation had more experiences and were generally better prepared to organize themselves, (Bauer, 1999). However, this was also a quiet time for the suffrage movement. It was not until 1914 when a younger generation of women began to hold street presentations, parades and other activism stunts to gain attention. In 1915 the National Woman’s Party formed and began to campaign against the party in power, (Bauer).At this time women were being arrested for their action and in jail some were mistreated. The mistreatment of women gained much attention creating public sympathy for the suffragists. Although World War I slowed the progression of suffrage by 1919 women the 19th amendment was officially passed. By Aug. 26, 19 20 then President Woodrow Wilson ratified the amendment allowing women to enter the polls for the first time in the United States. References (2008). The History of Women’s Suffrage. History . Retrieved from www. history. com Bauer, H. (1999). The Priviledge for Which We Struggled. Minnesota: Minnesota Historical Society Press.

Decision Making Models Essay

Managers have the responsibility of making decisions within that guide and provide direction to their organizations. Although decisions may be made by individuals, groups, or teams, it is the manager who coordinates the process of decision making. Managers make use of various decision making models to effectively steer the organizations. It is worth to noting that there is no one model or style that is always right or perfect in decision making. This is so because different people are successful and satisfied using different styles. There are two major broad models of decision making. These are the deterministic and probalistic models. The deterministic models result in good decisions with good outcomes. The manager using this model is able to get what he/she expects i. e. the out come is risk free. In probabilistic decision models, the expected results are uncertain and thus making good decision may not necessarily lead to good outcomes. The probabilistic decision making model is characterized by more concern with both the outcome value and the amount of risk each decision carries. All other effective decision making models can be classified as either deterministic or probabilistic model. The other subcategories of decision making models are mechanical, mental/verbal, analytical, and simulation. These models are classified based on such characteristics such as types, evolution in time, and availability of information (McCall M. , and Kaplan, R. (2001). ). Mechanical models take physical appearance of the object. They are used to display or test the design of items ranging from new buildings to new products. Mental/verbal models are also important and can be used to verbalize decision strategies for more complicated decision making models. The other model is analytical model which is a mathematical model and aimed at simplification, abstraction of real systems to give insight and understanding to some interested aspect of reality (Klein G. , et al. , (Ed. ) (1993). The analytical models are applicable to the deterministic systems. A simulation model is the last model that I am going to address. Simulation models are the computerized duplications of real systems and are seen to be more realistic, especially when modeling dynamic/probabilistic systems e. g. as used in aviation industry. Current Application Decision making models have assisted managers a lot in making viable decisions within the organization. The models discussed above have been implemented by individuals within organizations to come up with good decisions. For instance, the mental/verbal model has been used to aid in problem identification, in the development phase as well as the selection phase of decision making. Decision support system (DSS) has found usage in air-line management. Decision support systems and the models have been used to make decision both under risk, certainty, and even conflict in organizations. Other applications of the decision making models include the DSS for fiber optic Network Architecture Design and application of technology to cardiovascular diagnosis. Decision making models have also been used in forecasting with examples such as regression models and Box-Jenkins models. In brief, the use of effective decision making models by mangers has helped organizations to improve their businesses as a result of quality decision. The various effective decision making models used by mangers have both benefits and drawbacks or challenges associated with them. Mechanical decision making models have the advantage of being usable for experimentation. Mechanical models are credited for clearly describing the problem of system under study and thus results in innovative designs alternatives for decision making. Mechanical models also have some challenges in that they do not contain explicit relationships between the decision alternatives and dependant variables or objectives Mental/verbal models make the manager unable to experiment with them and cannot be used to show how outcomes or measures of effectiveness change with decision alternatives. It is also not possible to show how the relationships change with the decision alternatives. These models have the advantage of being easy to understand. They are also based on many years of managerial experience (Klein G. , et al. , (Ed. ) (1993). The advantages of analytical models include that they aim at simplification and bring understanding to some interested aspect of reality. They can also help to test the effects of different decision alternatives, constants and parameter values more easily than with any other type of model. They can also analyze complex problems efficiently and concisely, and in many cases provide the cheapest way to analyze these problems. Although they are the most prevalent models in use today they may not be easily accepted by managers who lack training, experience and time to use them. Simulation models have a high degree of abstraction and as such many managers do not want to work with them. The reason of this could be lack of enough training in and exposure to those models. The other reason is that trained managers may lack sufficient time to pay attention to model. Despite these drawbacks the models are beneficial in the sense that in comparison to the mechanical model they can facilitate experimentation because both the independent variables, dependent variables, constants and parameters are explicitly related by language of mathematics.