The Physics Field of Fluid Statics

Fluid statics is the field of physics that involves the study of fluids at rest. Because these fluids are not in motion, that means they have achieved a stable equilibrium state, so fluid statics is largely about understanding these fluid equilibrium conditions. When focusing on incompressible fluids (such as liquids) as opposed to compressible fluids (such as most gases), it is sometimes referred to as hydrostatics. A fluid at rest does not undergo any sheer stress, and only experiences the influence of the normal force of the surrounding fluid (and walls, if in a container), which is the pressure. (More on this below.) This form of equilibrium condition of a fluid is said to be a hydrostatic condition. Fluids that are not in a hydrostatic condition or at rest, and are therefore in some sort of motion, fall under the other field of fluid mechanics, fluid dynamics. Major Concepts of Fluid Statics Sheer stress vs. Normal stress Consider a cross-sectional slice of a fluid. It is said to experience a sheer stress if it is experiencing a stress that is coplanar, or a stress that points in a direction within the plane. Such a sheer stress, in a liquid, will cause motion within the liquid. Normal stress, on the other hand, is a push into that cross sectional area. If the area is against a wall, such as the side of a beaker, then the cross sectional area of the liquid will exert a force against the wall (perpendicular to the cross section - therefore, not coplanar to it). The liquid exerts a force against the wall and the wall exerts a force back, so there is net force and therefore no change in motion. The concept of a normal force may be familiar from early in studying physics, because it shows up a lot in working with and analyzing free-body diagrams. When something is sitting still on the ground, it pushes down toward the ground with a force equal to its weight. The ground, in turn, exerts a normal force back on the bottom of the object. It experiences the normal force, but the normal force doesnt result in any motion. A sheer force would be if someone shoved on the object from the side, which would cause the object to move so long that it can overcome the resistance of friction. A force coplanar within a liquid, though, isnt going to be subject to friction, because there isnt friction between molecules of a fluid. Thats part of what makes it a fluid rather than two solids. But, you say, wouldnt that mean that the cross section is being shoved back into the rest of the fluid? And wouldnt that mean that it moves? This is an excellent point. That cross-sectional sliver of fluid is being pushed back into the rest of the liquid, but when it does so the rest of the fluid pushes back. If the fluid is incompressible, then this pushing isnt going to move anything anywhere. The fluid is going to push back and everything will stay still. (If compressible, there are other considerations, but lets keep it simple for now.) Pressure All of these tiny cross sections of liquid pushing against each other, and against the walls of the container, represent tiny bits of force, and all of this force results in another important physical property of the fluid: the pressure. Instead of cross sectional areas, consider the fluid divided up into tiny cubes. Each side of the cube is being pushed on by the surrounding liquid (or the surface of the container, if along the edge) and all of these are normal stresses against those sides. The incompressible fluid within the tiny cube cannot compress (thats what incompressible means, after all), so there is no change of pressure within these tiny cubes. The force pressing on one of these tiny cubes will be normal forces that precisely cancel out the forces from the adjacent cube surfaces. This cancellation of forces in various directions is of the key discoveries in relation to hydrostatic pressure, known as Pascals Law after the brilliant French physicist and mathematician Blaise Pascal (1623-1662). This means that the pressure at any point is the same in all horizontal directions, and therefore that the change in pressure between two points will be proportional to the difference in height. Density Another key concept in understanding fluid statics is the density of the fluid. It figures into the Pascals Law equation, and each fluid (as well as solids and gases) have densities that can be determined experimentally. Here are a handful of common densities. Density is the mass per unit volume. Now think about various liquids, all split up into those tiny cubes I mentioned earlier. If each tiny cube is the same size, then differences in density means that tiny cubes with different densities will have different amount of mass in them. A higher-density tiny cube will have more stuff in it than a lower-density tiny cube. The higher-density cube will be heavier than the lower-density tiny cube, and will therefore sink in comparison to the lower-density tiny cube. So if you mix two fluids (or even non-fluids) together, the denser parts will sink that the less dense parts will rise. This is also evident in the principle of buoyancy, that explains how displacement of liquid results in an upward force, if you remember your Archimedes. If you pay attention to the mixing of two fluids while its happening, such as when you mix oil and water, therell be a lot of fluid motion, and that would covered by fluid dynamics. But once the fluid reaches equilibrium, youll have fluids of different densities that have settled into layers, with the highest density fluid forming the bottom layer, up until you reach the lowest density fluid on the top layer. An example of this is shown on the graphic on this page, where fluids of different types have differentiated themselves into stratified layers based on their relative densities.

The Faerie Queene Essay - 466 Words

The poem, The Faerie Queene, is a story about a courageous knight who goes through great trials and fights monsters. This in itself is entertaining but, it also has many allegorical references to Christianity. Many times Spenser talks about things when in reality hes really talking something closer to home. For instance, this faerie land he talks about sounds like he is referring to England, the country where hes from. Also, the title Faerie Queene itself is seems to represent Queen Elizabeth, the Queen of England. Redcrosse, the hero of the poem, is a major part of this allegory. He is called the Knight of Holinesse which is a reference to being holy and worshiping God. He represents the lonely Christian on a journey to put†¦show more content†¦As Redcrosse and Una travel on their way, things are fine and both are kept in tact. Redcrosse is first introduced to evil when fighting the dragon, Error. When fighting the dragon, Spenser writes, Her vomit full of bookes and papers was (177). These papers represent Roman Catholic propaganda that was put out in Spensers time, against Queen Elizabeth. This shows the allegory Spencer was trying to put forth in writing this poem. After defeating the dragon, Redcrosse and Una travel looking for the right path, when it starts to get dark and they find a place to stay, with a hermit in his inn. When they fall asleep, we find out who this hermit is, Archimago, an evil sorcerer. He conjures up two spirits to trouble Redcrosse. One of the spirits goes into his dreams and makes him dream of love and lust, when he awakes; he is lying next to the other spirit who is disguised as Una, who asks for a kiss from him. He turns it down, and falls back asleep. Then Archimago takes the spirit disguised as Una and lays it in a bed, and takes the other spirit and disguises it as a young man. Redcrosse awakes and sees this and is furious and decides to leave without her. The mission Archimago was out to accomplish had worked and he had separated holiness and faith. Now without faith, Redcrosse goes out and is all on his own. He travels on until he meets another knight, Sansfoy,Show MoreRelated The Faerie Queene Essay1944 Words   |  8 PagesEdmund Spenser’s epic poem The Faerie Queene is well known as an allegorical work, and the poem is typically read in relation to the political and religious context of the time. The term allegory tends to be loosely defined, rendering a whole work an extended metaphor, or even implying â€Å"any writing in verse or prose that has a double meaning†(Cuddon 20). In true Spenserian style, with everything having double meanings, both uses of the term allegory are applicable to his writing. Thus, duringRead More Dragons in Beowulf and in Edmund Spenser’s The Faerie Queene1982 Words   |  8 PagesDragons in Beowulf and in Edmund Spenser’s The Faerie Queene When one usually thinks of a dragon, one thinks of dragon-slayers, adventure, damsels in distress, and cheap fantasy novels. Dragons in literature have not always been used for such meaningless entertainment. There are many precedents for dragons in medieval literature, two of the most prominent being in the Old English poem Beowulf and in Edmund Spenser’s The Faerie Queene. In both of these epic poems, dragons playRead More Prophetic Vision in Edmund Spensers The Faerie Queene Essay632 Words   |  3 PagesProphetic Vision in Edmund Spensers The Faerie Queene In the First Book of The Faerie Queene, Edmund Spenser reveals his prophetic and apocalyptic vision for the fledgling British Empire, personified in his hero Redcrosse. As the secular instrument of Gloriana, the Faerie Queene, Redcrosse takes on the sacred task of Una (representing religious truth) to free her parents, Adam and Eve, from their bonds of sin. Before he can achieve his task, the Redcrosse knight (representing holiness) mustRead MoreEssay on The Role Of Nurse Glauce In The Faerie Queene1604 Words   |  7 PagesIn Book Three of The Faerie Queene, the character of Glauce plays an important role in aiding Britomart, the main character, to set off on her journey. Britomart, who represents Spensers idea of ideal Christian chastity, confronts some challenging and poignant issues before she heads off on her adventure; namely, she sees a vision of her future husband in an enchanted looking glass, and does not quite know how to handle the feelings of all-encompassing love that arise in her. The terror, doubtRead MoreEdmund Spenser, An English Writer Best Known For The Faerie Queene2627 Words   |  11 PagesINTRODUCTION EDMUND SPENCER Edmund Spenser was an English writer best known for The Faerie Queene, an epic ballad and fantastical moral story commending the Tudor tradition and Elizabeth I. He is perceived as one of the head experts of Modern English verse in its earliest stages, and one of the best artists in the English dialect. Edmund Spenser was conceived in East Smithfield, London around the year 1552 however there is some vagueness as to the careful date of his introduction to the world.Read MoreAnalysis Of Edmund Spenser s The Faerie Queene 1362 Words   |  6 PagesEdmund Spenser, in his description of the epic poem The Faerie Queene, labels his work as a â€Å"dark conceit.† One of the most defining characteristics of the work is its difficulty to decipher – the reader discovers just as much a challenge navigating the world as the Redcrosse Knight. The challenge not only makes Redcrosse more relatable as a character, but allows the poem to serve as a teaching mechanism on how to comprehend scripture, which requires just as much effort to follow. In order to discernRead More Edmund Spenser‘s Dazzling Quest for Virtue in The Faerie Queene733 Words   |  3 PagesEdmund Spenser‘s Dazzling Quest for Virtue in The Faerie Queene Voyeur: one who habitually seeks sexual stimulation by visual means (Websters Ninth New Collegiate Dictionary). According to Babys Record, as a child my favorite stories included Daniel in the Lions Den, Jonah and the Whale, Elisha and the 40 Children Eaten by the Bears, The Three Little Pigs, and Goldilocks and the Three Bears. Before sex came violence, tamed by a mothers lap and blessed by the inspired Word. VoyeurismRead MoreEssay on Role of Women in Edmund Spensers The Faerie Queene2903 Words   |  12 PagesRole of Women in Edmund Spensers The Faerie Queene      Ã‚     Edmund Spenser in his epic romance, The Faerie Queene, invents and depicts a wide array of female figures.   Some of these women, such as Una and Caelia, are generally shown as faithful, virtuous and overall lovely creatures.   Other feminine characters, such as Errour, Pride, and Duessa are false, lecherous and evil.   This might seem to be the end of Spensers categorization of women; that they are either good or bad.   Yet uponRead MoreEssay about Epic Conventions Applied in The Faerie Queene1711 Words   |  7 Pagestrue art form, he is also validating the English language’s need for a great national epic. On the other hand, Spenser, himself achieves to fulfil such a call with one of the best examples of epic poetry, through his incomplete masterpiece, The Faerie Queene, to the English literature. Unfortunately his life could not let him to finish the whole work as his intents, he is able to write only six books instead of twenty- four books as h e presumes to finish. Although it is not fully completed, still remainsRead MorePowerful Women of The Faerie Queene and Paradise Lost Essay1197 Words   |  5 Pages  Ã‚  Ã‚  Ã‚  Ã‚   Two very powerful female figures are presented in Error of The Faerie Queene, and Sin of Paradise Lost. These two characters are quite similar in description, Milton making a clear tribute to Spencers work. Both characters have the same monster qualities, and both posses allegorical names and qualities. Error is by far the most disgustingly described of the two monsters. In Book 1, Canto 1, she is the first obstacle to meet the knight and his party. She represents the consequences of the

The Enlightenment of the 17th and 18th Century Essay

The Philosophes French intellectual leaders of the Enlightenment were bankers, merchants, and professional men who had education and wealth. As a result of their political voice being denied to them, these men paved the way for the French Revolution through their skeptical attitudes toward government, religion, and social traditions. This group of aggressive dissenters and critics of the Old Regime, the prerevolution monarchy, were the Philosophes. The Enlightenment of the 17th and 18th century involved a particular group of French thinkers who were very popular during the middle of the 18th century. This group was known as the Philosophes, a large group of people who pursued a variety of the same intellectual interests. Believing†¦show more content†¦It states that the knowledge of the natural world should be torn away from that of the religious world. The natural world and the religious world are two completely separate entities that should not be combined together to form religious ideas or beliefs. Tolerance is something that everyone must have. Philosophes strongly believed that most human crimes committed were done for religion or in the name of God. People have to learn to separate God and life decisions so that they cannot be used together as an excuse. Philosophes felt that people within themselves have the tolerance to stay away from crime and to not commit criminal acts but do so because they are morally weak. They need to build up their tolerance and they will have all the answers they need. One of the greatest and most influential Philosophes of all time is Francis Marie Arouet, also known by the name of Voltaire. (www.voltairefoundation.com) Voltaire was born in Paris, France on November 21, 1694. He concentrated most extensively on two specific philosophical projects. Voltaire worked very hard to introduce empiricism, easily defined as information that can be gained as a result of careful observation. From this observation one can make laws or principles, as was prac ticed by the English into the French lifestyle. (www.voltairefoundation.com) Voltaire alsoShow MoreRelatedThe Importance of the Scientific Revolution to Europe1176 Words   |  5 Pagesthat many ask themselves when asked to define scientific revolution and enlightenment in the 17th/ 18th century. The terms â€Å"Scientific Revolution† and â€Å"Enlightenment† are used to describe two important phases that Europe came across during the 1500s to the 1800s. The 17th century scientific revolution left a huge impact on Europe leading it to the 18th century enlightenment. The Scientific Revolution in the 16th and 17th century was the start and new beginning to the modern science. The new discoveriesRead MoreEssay on Revolution in Scientific Affairs977 Words   |  4 PagesEurope changed dramatically in the course of the 17th and 18th centuries. In many ways, this change was a result of changes in intellectual’s approach to natural history, or science. This revolut ion in scientific affairs, sparked by thinkers like Bacon, Newton, and Descartes, resulted in a significant upheaval in the arts and literature of Europe. Research into this spread of scientific thinking, which would eventually come to influence ideas about such wildly disparate fields of human endeavorRead MoreThe 18th Century Enlightenment1487 Words   |  6 Pages Upon analyzing the contemporaries of the 18th century enlightenment period, it is important to note that the idea of â€Å"change† caused unease and anxiety to settle in. The enlightenment was a European philosophical movement led by philosophers, Kant, Voltaire, Rousseau, Hobbes, and Locke. These thinkers began to question the way of life in the contemporary world and discussed the potential of â€Å"man†. Immanuel Kant hypothesized that man is immature and has yet to find his true potential. QuestioningRead MoreThe Renaissance And The Enlightenment757 Words   |  4 PagesRenaissance Values and Enlightenment Ideals - Conflict or Progress on the Same Journey? The Renaissance and the Enlightenment are two significant periods in world history, specifically in European history. The Renaissance and the Enlightenment have distinctive characteristics, but share the notion of being periods of discovery in many aspects of life. Each period has its own set of beliefs, values, and ideals otherwise known as a â€Å"worldview†. It can be thought of as a framework of principles throughRead MoreThe French Revolution And The Enlightenment1471 Words   |  6 Pageshistory, the 18th century marks a change in time. The age old traditions of the Ancient Regime and Catholic Church will see a shift in power. Power now in the hands of the people. Through bloodshed, the radical actions of the French Revolution sparked by philosophies of Enlightenment, will impact the future. Historical figures such as Robespierre heading the Great Assembly will drive change in culture through the revolution, in hopes of achieving enlightened societies. The 18th century marks the beginningRead MoreEuropean Exploration : The Age Of Discovery1128 Words   |  5 PagesEuropean states decided to partake in global explorations in the early fifteenth century. By doing so, this opened up a new chapter in world history, known as the Age of Discovery. During this time, Europe expanded to the Americas, Africa, and the Far East being the first orbit around the world. â€Å"Profound misconceptions about geography and the cultures of local populations would change very slowly throughout he early centuries of European exploration.† (The Saylor Foundation The European Voyages of Exploration:Read MoreAdvancements During The 18th Century1245 Words   |  5 PagesDBQ Essay During the 18th century, advancements to European thought commenced being wide spread throughout the continent. These advancements, known as the Enlightenment, urged Europeans to look beyond what they had previously known and to expand their knowledge, in order to reform their societies in political and economic matters. Enlightenment thinkers believed in human ability to understand the world in which they lived and to conform it to their needs. They advocated many methods of economicRead MoreEnlightenment And The Enlightenment Movement In The 18th Century975 Words   |  4 PagesEnlightenment is a concept that promoted individual rational logic and thinking as more valuable than traditional. The enlightenment thinkers rejected the old assumption about everything and committed to things that could be demonstrated through scientific experimentation. They are loosely organized intellectual movement, egalitarian, liberal, rationalist, secular, and impartial in both values and outloo k. In the longer term standpoint, the enlightenment can be taken to the last phase of the cumulativeRead MoreAge of Enlightenment: Revolutionary Viewpoints Spreading Essay830 Words   |  4 PagesThe age of enlightenment is a term used to describe a time in Western philosophy and cultural life centered upon the late 17th and 18th century. (wikipedia.com) When the word enlightenment comes to mind your first thought is of change for the better. A time of prosperity and success within a country. Several individuals have been credited and blamed for leading and contributing to the Enlightenment. These thinkers not only changed their views, but also spread revolutionary ideas to others. TheseRead MoreEssay on Great Britain Rise as the Global Leader of the 18th Century781 Words   |  4 Pagesglobal leader of the 18th century. Prior to the Treaty of Westphalia, which ended the Thirty Years War, the Spanish and the Holy Roman Empire held much of the power in Europe. Only with the suppression of Catholicism and the development of national sovereignty did Great Britain have the opportunity to rise through the ranks. While much of continental Europe was seeking to strengthen their absolute monarchies and centralized style of governing, in the 17th and 18th centuries Great Britain was making

Cognitive Behavioral Therapy Essay - 1372 Words

Cognitive Behavioral Play Therapy takes into account interactions between cognitions, emotions, behavior, and environment. The therapist looks to modify attitudes, beliefs, and expectations, they aim to identify and modify maladaptive thoughts. ( Knell 2009) The emphasis of therapy is placed on the child, issues of control, master, and responsibility are addressed as well as responsibility for one’s own behavior change. A child’s perception of events rather than the event themselves is assumed as the cause for behavior in cognitive therapy. (O’Conner Braverman 2009) Through therapy sessions the client is able to come to the realization that their thoughts and beliefs are irrational. The sessions offer the opportunity for the†¦show more content†¦Other influential theorists / practitioners include Michael Mahoney, Ph.D., Donald Meichenbaum, Ph.D. (Stress Inoculation Therapy) and David Burns, M.D. David Burns, M.D. popularized CBT with his 1980s best-selling book, Feeling Good. More recently, cognitive-behavioral therapy has been influenced by the work of Aldo Pucci, Psy.D. (Rational Living Therapy), Michael Mahoney, Ph.D., Marsha Linehan, Ph.D., and Arthur Freeman, Ed.D.† (National Association of Cognitive Behavioral Therapy 2011) Cognitive Behavior therapy is not a distinct therapeutic technique it is actually a mix of approaches that have the following characteristics, its based on the cognitive model of emotional response, its briefer and time limited, it’s a collaborative effort between the therapist and client, some is based on aspects on stoic philosophy, (Beck’s is not). It uses the Socratic method; the therapist wants to gain understanding of the client and their concerns. Cognitive Behavioral therapy is structured and directive, and is based on an educational model; believing that behaviors are learned, the theory and techniques rely on the inductive method if we find that what we thought is not correct we can change our thinking. Homework is a central part of CBT, in our case with Cognitive play therapy the home work is often a part that is given to the parents. (National Association of Cognitive Behavioral TherapyShow MoreRelatedBehavioral Therapies : Cognitive Behavioral Therapy175 2 Words   |  8 PagesFrom the lens of a Cognitive Behavioral Therapist, an integrated mix of both cognitive and behavioral approaches is best suited the treatment of clients. All the approaches under Cognitive Behavioral Therapy require several different attributes. Some of them being; the need for a positive working relationship between client and therapist, the belief that distress is a cognitive process, treatment is a focus in changing cognitions to create positive change in mood or behavior. Changing irrationalRead MoreBehavioral Therapy And Cognitive Therapy869 Words   |  4 Pagespaper, I will compare and contrast Group Therapy and Cognitive therapy, more specifically, dialectical behavioral therapy, and the differences between assessment types that clinicians use to determine a diagnosis and therapy that would best benefit their client. In the second part of my paper, I will discuss and address different considerations in which a therapist should make in order to provid e a safe and effectively therapeutic environment. Though therapy is a largely utilized form of mental healthRead MoreCognitive Behavioral Therapy2168 Words   |  9 PagesBackground Developed in the mid 1960s by Aaron Beck, the Cognitive Behavioral Therapy (CBT) model theorizes that the interpretation of both external and internal events is biased, and can tap unhealthy underlying beliefs that potentially lead to emotional distress (Beck, 2005). Over the years CBT has accumulated an impressive track record in the treatment of a variety of mood disorders. In 1985, a review of 220 studies using CBT in the treatment of depression concluded that 91% supported the modelRead MoreCognitive Psychology : Cognitive Behavioral Therapy1447 Words   |  6 PagesCognitive Behavioral Therapy Djiedjorm Doe (Dede) Middlesex Community College Cognitive behavioral therapy, commonly known as CBT, is a systematic process by which we learn to change our negative thought into more positive ones. CBT is a combination of two types of therapy, cognitive therapy and behavioral therapy. cognition is our thought, so cognitive behavioral therapy combines working with our thought process and changing our behavior at the same time. Cognitive behavioral therapistsRead MoreCognitive Psychology : Cognitive Behavioral Therapy1502 Words   |  7 PagesCognitive Behavioral Therapy, in its most modern form, was developed in 1960 by Aaron T. Beck. However, CBT has an interesting history dating back to the 1920s in the United States and even earlier in other parts of the world. â€Å"Precursors of certain fundamental aspects of CBT have been identified in various ancient philosophical traditions, particularly Stoicism. Stoic philosophers, particularly Epictetus, believed logic could be used to identify and discard false beliefs that lead to destructiveRead MoreCognitive Behavioral Therapy And Narrative Therapy1706 Words   |  7 Pagesgoing on in his every day life. The two that we have chosen are Cognitive-behavioral therapy and Narrative therapy. We will look into both of these and also as we do that we will find out what the role of the social worker is in both cases. Cognitive-behavioral therapy can help you notice the discouraging thoughts that make you feel bad. These thoughts are sometimes called irrational or automatic thoughts. Using Cognitive-behavioral therapy you can learn to stop these thoughts and replace them with helpfulRead MoreCognitive Behavioral Therapy And Narrative Therapy1706 Words   |  7 Pagesgoing on in his every day life. The two that we have chosen are Cognitive-behavioral therapy and Narrative therapy. We will look into both of these and also as we do that we will find out what the role of the social worker is in both cases. Cognitive-behavioral therapy can help you notice the discouraging thoughts that make you feel bad. These thoughts are sometimes called irrational or automatic thoughts. Using Cognitive-behavioral therapy you can learn to stop these thoughts and replace them with helpfulRead MoreCognitive Behavioral And Behavioral Family Therapy2903 Words   |  12 Pages Week 11 Assignment: Signature Assignment: Cognitive Behavioral Family Therapy Rayon L. Walton Nortcentral University One of the most effective components of MFT is Cognitive Behavioral Family Therapy (CBFT). CBFT incorporates cognitive processes that affect behavior and applies it to the therapeutic process of clients. The foundational principles of CBFT stem from behavioral concepts that were impacted by issues that affected clients such as phobias, anxiety and parenting deficiencies;Read MoreCognitive Therapies And Behavioral Therapy982 Words   |  4 PagesCognitive behavioral therapy, on the contrary, utilizes directive consulting tools to control and guide its patients. These include such things as asking questions, interpreting, and providing direction to a client’s attention and emotions. â€Å"Aaron Beck developed cognitive therapy, an approach that focuses on recognizing and changing negative thoughts and maladaptive beliefs into more realistic and constructive thoughts and beliefs† (Erford, 2014). It is believed that cognitive behavioral therapyRead MoreCognitive Psycholo gy : Cognitive Behavioral Therapy1700 Words   |  7 PagesCognitive Behavioral Therapy Cognitive behavioral therapy is a school of psychotherapy that intends to assist individuals with conquering their emotional issues. A focal idea in CBT is that you feel the way you think. Therefore, CBT focuses on the fact that you can live all the more cheerfully and effectively in you begin thinking with a better mindset. CBT urges you to comprehend that you re thought process or beliefs lie between the occasion and your definitive sentiments and activities. The

The Use of Lasers in Esophageal Cancer Treatment Free Essays

Esophageal cancer is a rare form of cancer, but its numbers are on the rise around the world (Staff, Mayo Clinic 1). This disease occurs when malignant or cancerous cells form in the tissues of the esophageal lining of the body’s gastrointestinal tract. The esophagus is responsible for moving swallowed food and liquids from the mouth into the stomach for digestion. We will write a custom essay sample on The Use of Lasers in Esophageal Cancer Treatment or any similar topic only for you Order Now It consists of several tissue layers, including the mucous membrane, muscle, and connective tissues. When cancer forms in the esophagus, it begins in the innermost layer of the tissue (the mucous membrane) and moves outward (towards the connective tissue layer) as it spreads (see Figure 1). It often goes undetected for many years, and in its later stages, this cancer is not easily treatable. Among those who develop esophageal cancer, their long-term survival rate is low, as it is estimated that only 12. 5% of patients live five years beyond the date of diagnosis (Triesschejin, Martijn 5). The standard treatment option used to combat esophageal cancer is called an esophagectomy, in which the cancerous area of the esophagus is removed via surgery, however this procedure is very invasive, complicated, and is often times fatal. However, with today’s technological advancements, safer, less-invasive methods are beginning to replace this option and are proving to be successful in helping to extend the lives of those patients with severe esophageal cancer and aid in improving their quality of life. One up-and-coming treatment option that is far more safe and practical than esophagectomy is the integration of lasers in photodynamic therapy, or PDT. Although it is still an experimental treatment, is ideal because it has no long-term side effects, is minimally invasive, can be done quickly with little recovery time, has the ability to precisely target the areas of the body where the cancer cells are present, and can be safely repeated multiple times until the desired results are achieved. Post-treatment, it has been known to cause sensitivity to light, particularly pertaining to the patient’s eyes and skin, however this has not been shown to be a significant issue among those treated with PDT. Photodynamic therapy uses special drugs, known as photosensitizing agents, along with laser light to kill cancer cells closer to the surface of the skin. The agents are injected into the body via and ‘switched on’ with light of the appropriate wavelength depending on the drug utilized. Chemical and molecular reactions within the ody from the drugs then destroy the cancer cells and work to rid the body of the esophageal disease. Although several sources of light are possibilities when performing photodynamic therapy, lasers are the most preferred. They are the most effective in emitting monochromatic light, or light that is of a single wavelength and color, corresponding to all of the different absorption maxima of photosensitizers’ compounds, and can b e relatively easily coupled to optical fibers from 200 to 600 microns’ core sizes. Specifically, the type of laser that is optimal for the treatment of esophageal cancer is a diode laser. These lasers are the most recent to be used in cancer treatment, and were developed just within the last fifteen years. Thus, they have higher quality beams, expanded ranges of wavelengths, and can be used on higher powers if desired. Diode lasers are ideal because they are simple to use, easy to transport, and do not require difficult installation like the gas (argon) and dye lasers used before them (Boucher 74). The diode laser currently approved by the FDA is manufactured by Angiodynamics, and has been successfully used, along with the correct application of photosensitizers, in esophageal cancer treatments. â€Å"A good photosensitizer is preferably a pure compound with a constant composition† (Nyman 3). And in esophageal cancer treatment via PDT, the best-proven photosensitizer is called porfimer sodium, also commercially known as Photofrin ®. In fact, the United States’ Food and Drug Administration has only approved the use of this photosensitizer in the treatment of esophageal cancer via PDT (â€Å"Photodynamic Therapy† 2). Porfimer sodium is injected intravenously, where it is then absorbed by all of the body’s cells, but only those cells that are normal and not cancerous are able to get rid of it. To allow for the body’s normal cells to rid themselves of the drug, two to three days are given between the drug’s administration and the activation of the drug by laser light. After being passed down the throat through a small flexible tube called an endoscope, a thin fiber optic glass strand is used to direct the laser light at the affected area. The optical fiber is made of fused silica, and uses a balloon catheter to distribute a defined, controlled amount of light to the treated esophagus organ. If the beam were not diffuse, a direct beam (even at a low power) could be damaging to the esophageal tissue. The light is operated at weaker power of around 2 Watts to ensure that it does not burn any tissue, and it is relatively pain-free. The treatment it is applied for no longer than an hour at a time and can often be done in an outpatient setting (reference all sources listed). Normally, the most common wavelength used is red light, as its specific wavelength of 630 nanometers has been shown to work best when attempting to create the most effective and potent malignant cancer cell-killing method possible. Atomically speaking, following its activation by laser light, â€Å"†¦the photosensitizer is elevated from a ground state to a long lasting excited triplet state†¦. and it] can then react with cell membranes to form radical ions [intermediates] which interact further with oxygen to produce cytotoxic oxygenated molecules† (Gray 1). More simply put, the excited photosensitizer activated by the laser light transfers its energy to other molecules before returning to its ground state, which generates a reactive oxygen species (intermediate) that is able to directly kill and destroy the esophageal tumor via oxidation, and later, indirectly, via inflammation. Research has shown a huge increase in the survival rate of PDT patients receiving this treatment. Treated patients’ survival rates improved 25% over a span of five years compared to those who never received any type of treatment (Li 2). And although doctors have seen great success with the use of photodynamic therapy and diode laser treatments, there is still much more to be researched and improved upon. Currently, new drugs, such as Photochlor ®, and others are being clinically tested to see if they can be used as photosensitizers in the treatment of esophageal cancer. This photosensitizer looks promising, as it has already been shown to last a much shorter time and is more easily removed from the body than Photofrin ® is. Also, scientists are looking at the possibility of using ointments containing ferrous or colbalt ions and hydrogen peroxide on the treated cancerous area to improve PDT outcomes along with laser light. And with the further advancement of technology, hopefully newer treatments will be able to not only improve the outcomes of patients with severe esophageal cancer, but be able to cure them of it once and for all. How to cite The Use of Lasers in Esophageal Cancer Treatment, Essay examples

Anorexia Nervosa Essay Introduction Example For Students

Anorexia Nervosa Essay Introduction Eating disorders are a cause for serious concern from both a psychological and anutritional point of view. They are often a complex expression of underlyingproblems with identity and self concept. These disorders often stem fromtraumatic experiences and are influenced by society`s attitudes toward beautyand worth (Eating Disorder Resource Center, 1997). Biological factors, familyissues, and psychological make-up may be what people who develop eatingdisorders are responding to. Anyone can be affected by eating disorders,regardless of their socioeconomic background (Eating Disorder Resource Center,1997). Anorexia nervosa is one such disorder characterized by extreme weightloss. It is the result of self imposed and severe restrictions of food and fluidintake, a distorted body image, an intense fear of becoming fat, and a poor selfesteem. Besides dieting to extremes, anorexics often over exercise to loseweight. Anorexics themselves are often the last to realize how undernourishedand unde rweight they are. Even after reaching a weight that is dangerously low,they feel good initially, about losing the weight. No matter how much is lost,anorexics continue to feel fat and desire to lose more weight. It is this denialthat makes it so hard to convince anorexics to seek help (Eating DisorderResource Center, 1997). This paper`s focus is to look in more detail at thepsychological and societal factors contributing to anorexia nervosa, as well asthe nutritional and physiological complications that arise for people on suchseverely restrictive diets. Psychological and Societal Contributions AnorexiaNervosa was first described by an English physician by the name of RichardMorton in 1689. Until 1914, it was considered a disease that arose from a morbidmental state and a disturbed nerve force. That year, Dr. Simmonds, apathologist, found one woman=s refusal to eat to be the direct result of ananterior pituitary lesion. This shifted the focus away from the emotionalaspects of the di sorder to more physiological and endocrinological terms. It wasnot until 1938 that anorexia nervosa was once again considered a largelyemotional disorder (Blackman, 1996). In fact, one of the criteria for thediagnosis of anorexia nervosa according to the manual of The American MedicalAssociation (DSM IV) is an intense fear of gaining weight or becoming fat, eventhough underweight. Another clearly psychological requirement for diagnosis, isa disturbance in the way in which one=s body weight or shape is experienced,undue influence of body weight or shape on self evaluation, or denial of theseriousness of the current low body weight (Blackman, 1996). Anorexia nervosamay be a primary disorder in which other psychiatric conditions are secondary,such as depression. It may also be secondary itself to a disorder such asschizophrenia or co-morbid with obsessive compulsive disorder. As well, it canalso be a component of a personality disorder (Blackman, 1996; Carlat, 1997). The anorexic sufferer is typically female. Ninety-percent of all cases occuramong adolescent girls or young women but the number of males with the disorderis on the rise (Blackman, 1996; Carlat, 1997; Kinzl, 1997). It is estimated that1% of girls ages 12-18 meet the criteria for full blown anorexia and as many as5-10% have milder forms of such eating disorders if the criteria is applied lessstringently (Blackman, 1996). Anorexics are usually high achieving youngsterswho may be heavily involved in sports (e.g. gymnastics, swimming, cheer leading,ballet, etc.). These people are often competitive, perfectionistic, withobsessive compulsive personality features. Fears of growing up or discomforttoward sexuality may also be precipitating factors (Blackman, 1996). Studieshave shown that 75% of American Women are dissatisfied with their appearance andas many as 50% are on a diet at any one time. Even more alarming is that 90% ofhigh school junior and senior women regularly diet, even though only between10%-15% are over the weight recommended by the standard height-weight charts(Council on Size and Weight Discrimination, 1996). The majority of these womendo not develop eating disorders; however, 1% of teenage girls and 5% ofcollege-age women do become anorexic or bulimic (Council on Size and WeightDiscrimination, 1996). Perhaps these figures represent the women who are lessable to cope with their bodily dissatisfaction and thus are the ones who takedieting to the extreme. The disordered eating behavior usually starts out with apattern of dieting or particular food choices, such as avoiding certain foodswhich are seen as fattening. As the disorder progresses, anorexics becomeresourceful in hiding their troublesome behavior and may start to avoid eatingwith their families. They may also attempt further weight loss by compulsiveexercising. The condition can become well advanced before parents even notice,as anorexics may wear many layers of clothes to conceal their thinnes s. Oftenthe diagnosis is not made until the person is brought to a clinic for problemssuch as physical weakness, lack of energy, excessive sleepiness, and recent poorperformance in school (Blackman, 1996). Actually, certain familial relationshipsseem to be more prevalent among anorexic sufferers. Studies have shown manyanorexic families are enmeshed, overprotective, conflict avoidant, and asco-opting the anorexic in destructive alliances with one parent or another. Theparents themselves tend to be more affectionate and neglectful than parents ofnon anorexic children. The father in particular is often controlling (Blackman,1996). Physical and/or sexual abuse are also not uncommon features in familieswith anorexics (Carlet, 1996; Kinzyl, 1997). Even though these trends are trendsoften seen, there are many anorexic families that do not fit this profile. Oneof the other major contributors to the disorder is society and its values. Anorexics are sensitive to society=s approval of what is an acceptable weight orbody size (Blackman, 1996). Self worth is equated with a desirable slimappearance. This creates a vulnerability to eating disorders for people who areespecially concerned with meeting this ideal. Western culture in particular hasan obsession with looks. Slim, attractive people are linked to beauty, success,and happiness. Our society teaches us to value such superficial standards andbombards us with images of the idealized female body through mediums such asmagazines, films, and television (Blackman, 1996). One only has to watchtelevision or read the latest magazines and take note of just how few overweightor average looking people there are appearing in advertisements to verify thisfact. Anorexia nervosa in fact predominates in industrialized developedcountries; yet is extremely rare in less industrialized and non westerncountries (Blackman, 1996). As well, immigrants who have migrated to awesternized cou ntry have been found to become more prone to develop eatingdisorders (Blackman, 1996). For the sufferer of anorexia, the onset of thedisease often begins with a chance remark by someone important to them, possiblya coach or a friend. They may suggest that they are getting fat, big, clumsy, orthat their performance (if they are athletes) is suffering (Blackman, 1996). The Greenhouse Effect Argumentative EssayThe nutritionist then must carefully plan nutrition education sessions to makethem as meaningful to the person as is possible. Refeeding is also not astraightforward process as anorexics often find it quite difficult to gainweight. This is due to an increased diet induced thermogenesis and a lowermetabolic efficiency. Anorexic patients can waste about 50% of the energy oftheir food due to this inefficient metabolism at the start of refeeding, makingthe maintenance of any gain in weight difficult (Moukadden, 1997). Another studyconcluded that even with weight gain after 3 months to a year, it was not enoughto maintain a desirable nutritional status. This was because patients did notreach an adequate body mass index and their immunological indexes were lowerthan in control subjects during an entire one year follow-up (Marcos, 1997). Conclusions From the information presented, one can only imagine just howcomplex the issues really are that the anorexic attempts to deal with viadieting. The anorexic may be dealing with substance abuse, depression, sexualabuse, confusion about their sexual orientation, or bodily dissatisfaction toname a few. The individual anorexic may be suffering from a combination of suchissues in varying degrees. To what extent, psychological, societal, andbiological factors affect the onset of the disorder is, as of yet, too complexto determine. It appears to vary from individual to individual, although thereare some features seen more commonly than others. The variability seen with thedisorder on an individual basis is why the anorexic sufferer can not becategorized into a particular stereotypical group. It is not just the whiteadolescent girl who is affected. The disorder affects various other groups aswell and is being seen more frequently in groups it did not typically affect. Ithas been m entioned how the disorder is becoming more prevalent among immigrantswho move to westernized cultures; yet, the disorder is rarely ever seen in lessdeveloped countries. Males also are being seen more frequently to be sufferersof this traditionally female disorder. This data seems not to point to aparticular group as being more prone to developing anorexia, but instead pointsto society=s unrealistic and unachievable ideals, as encouraging more sensitive,insecure, or emotionally disturbed individual members of society to lose weight. Weight loss often provides these people with short lived confidence, and for awhile they feel good about their weight loss and in control of something intheir life. They inevitably desire to feel like this again so they set out tolose more weight. This cycle continues until someone steps in and helps thesufferer by convincing them to seek help. This can be hard as the anorexic isusually so far in denial that they are the last to realize just what shape theyare in. The road to recovery is difficult and the body seems to resist anyweight gain during the initial refeeding period. Even after an entire year oftreatment, evidence suggests that recovery has not been achieved and manyanorexics still continue to suffer from their disorder. There are so manycomplications that anorexia can be attributed to that it would appear that thequicker a person complies with treatment and can be recovered, the better. It isquite obvious that anorexia is a complex disorder that partly involves how oneperc eives his or her self and what physical standard society dictates theyshould live up to. The topic has many areas that require further research associety has been shown not to be the entire causative factor for the developmentof the disorder. It has been shown to be one of them however; so until societybecomes more realistic in the ideals it endorses, it is responsible, at least inpart, for the prevalence of this disorder. BibliographyBlackman, M. A Anorexia Nervosa: Diagnosis and Management, @ Medical ScopeMonthly, July/August, 1996 (or see www.tminus10.com/children/health/anex.htm). Carlat, D. J. ; Camargo Jr. , C. A. ; and Herzog, D. B. AEating Disorders inMales: A Report on 135 Patients, A American Journal of Psychiatry, 154, August1997, 1127-1132. Council on Size and Weight Discrimination. Facts and Figures. New York: Council on Size and Weight Discrimination, Inc. , 1996. EatingDisorder Resource Centre of British Columbia. Do I Have an Eating Disorder? . Vancouver: Working Design, 1997. Kershenbaum, A. ; Jaffa, T. ; Zeman, A. ; andBoniface, S. A Bilateral Foot Drop in a Patient With Anorexia Nervosa, AInternational Journal of Eating Disorders, 22, November 1997, 335-337. Kinzl, J. F. ; Mangwelth, B. ; Traweger, C. M. ; and Biebl, W. A Eating-DisorderedBehavior in Males: The Impact of Adverse Childhood Experiences, A InternationalJournal of Eating Disorders, 22, September 1997, 131-138. Marcos, A. ; Varela,P. ; Toro, O. ; Lpez-Vidriero, I. ; Nova, E. ; Madruga, J. C. ; and Morand,G. AInteractions between nutrition and immunity in anorexia nervosa: a 1-yfollow up study, A American Journal of Clinical Nutrition, 66, August 1997,485-490. Merriman, S. H. A Nutrition education in the treatment of eatingdisorders: a suggested 10 session course, @ Journal of Nutrition and Dietetics,6, October 1996, 377-380. Moukadden, M. ; Bouler, A. ; Apfelbaum, M. ; andRigaud, D. A Increase in diet-induced thermogenesis at the start of refeeding inseverely malnourished anorexia nervosa patients, A American Journal of ClinicalNutrition, 66, July 1997, 133-140. Murnen, S. K. ; and Smolak, L. A Feminity,Masculinity, and Disordered Eating: A Meta-Analytic Review, A InternationalJournal of Eating Disorders, 22, November 1997, 231-242. Neumrker, K. AMortality and Sudden Death in Anorexia Nervosa, A International Journal ofEating Disorders, 21, April 1997, 205-212. Nimmons, D. A Sex and the Brain, ADiscover, March 1994, 64-68, 70-71. Rock, C. L. ; Gorenflo, D. W. ; Drewnowski,A. ; and Demitrack, M. A. ANutritional characteristics, eating pathology, andhormonal status in young women, A American Journal of Clinical Nutrition, 64,October 1996, 566-571Health Care

Intercultural Communication free essay sample

Employers and employees should work together to understand the different cultures that coexist within the work organization. As stated by Allwood J. (Ed. ) (1985) â€Å"Since the basic difficulty in intercultural communication is the differences that exist between the sender’s and receiver’s cultural background and way of communicating, the first action to reduce the risks of misunderstanding would be to gather an informed insight into the differences and similarities which should not be ignored as they can form a general human base that can be used to solve some of the difficulties in interpersonal communication. Thus understanding the diversity not only helps to overcome intercultural misunderstandings but helps also to improve interpersonal communication within the work organization 6. 2. 3Be flexible Employers and employees should also learn to be flexible and develop skills needed to be used in intercultural communication. As stated by Allwood J. (Ed) (1985) †Å"The most far-reaching goal to achieve good intercultural communication is to give people the ability and skill to live in other cultures and to exercise other communication patterns. We will write a custom essay sample on Intercultural Communication or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page For this type of communication, training in the language of the new culture is clearly of the greatest importance. Thus learning the new language is learning intercultural communication as we will be speaking the language of others from different cultural backgrounds compared to us. † This means that we must be susceptible to accept change in the lingua franca of the organization or even abiding by new organizational policies that encourage intercultural communication and understanding. 6. 2. 4 Develop empathy Empathy literally means â€Å"feeling into† another’s feelings with one’s own, vicariously, and attempting to achieve some i-thou congruence. Empathy is multi-faceted, involving cognitive (thinking), affective (feeling), and communication component: Cognitively , the empathic person take the perspective of another person, and in so doing strives to see the world from the other’s point of view. Affectively, the empathy person experience the emotion of another, he or she feels the other’s experiences. Communicatively, the empathic individual signals understanding and concern through verbal and nonverbal cues (Bell, 1981). Thus through the development of empathy we can manage to understand why a certain person acts a certain way when faced with problems caused my intercultural misunderstandings and such. 6. 2. 5Management training. The traditional disciplines of management do not lend themselves to knowledge management and should be revised so that the knowledge based competence of a corporation can be managed effectively and efficiently. Traditional notions about strategy, human resource management, finance and marketing should be re-examined and revised in order to manage knowledge for competitive advantage (Ichijo and Nonaka, 2007:7). I endeavour to review their contributions and indicate how they contribute to our understanding of management theory and practice of management training in communication skills. They must interact with each other to transcend their own boundaries and as a result change themselves. Organizations don’t just solve problems, they create and define them (Nonaka et al. , 2000:3).