Explain the basic principles of MR image production Essay

Explain the basic principles of MR image production - Essay Example The frequencies absorbed in magnetic resonance are in the megahertz (million cycles per second) and gigahertz (billion cycles per second) ranges. The absorption frequencies for any particular substance are directly proportional to the strength of the magnetic field. This characteristic is unique to magnetic resonance. There are two distinct subcategories of magnetic resonance. One of these, for which the absorbing particles are electrons, is known by either of two interchangeable names: electron spin resonance (ESR) or electron paramagnetic resonance (EPR). The other category, in which the absorbing particles are atomic nuclei, is called nuclear magnetic resonance (NMR).2 The resonances are actually the absorptions of particular frequencies and are found in EPR and NMR arises from some of the most fundamental properties of matter. A general theory of EPR and NMR must be derived from quantum mechanics, but a classical analogy provides some insight. In the familiar model, every atom has a massive nucleus containing N positively charged protons and a number of uncharged neutrons. Outside the nucleus are N negatively charged electrons in various "orbits" or "distributions." The number N, called atomic number, identifies the atom in the periodic table. 3 Every electron and proton possesses, in addition to charge and mass, an indestructible amount of angular momentum or "spin," the property that keeps a gyroscope spinning after the driving force is removed. Because moving charge always has magnetic effects, the combination of charge and spin makes every electron and proton a spinning permanent magnet, the strength or "magnetic moment" being several hundred times greater for electrons. A spinning electron can be compared to the spinning wheel of a toy gyroscope. When the gyroscope's spin axis is off vertical, and the bottom end of the axis rests loosely on a support, the unexpected happens. Instead of falling farther from the vertical under the force of the wheel's weight, the spin axis rotates steadily around the vertical at a fixed angle from it, a motion known as "precession." In EPR the electron is spinning and a microscopic magnet. The externally applied magnetic field supplies the extra force, and the electron's spin axis precesses. Resonant absorption occurs when the source frequency is synchronous with the precession frequency. A similar explanation applies to NMR. 4 Magnetic Resonance Image Production Figure 1 illustrates the a simplified block diagram of generic MR imaging mechanism demonstrating the elements essential for the recognition and creation of MR signals and the demonstration of MR images. These components are as follows: 1) The RF mechanism (a) for the production of the magnitude of the RF magnetic field with the help of a coil for transmitting mode, amplifier and a transmitter, b) for the detection of the free induction decay (FID), which is the result of the net magnetization to an RF pulse this is done by the help of a signal demodulator, a coil for

Question of Authorship Essay Example for Free

Question of Authorship Essay For the past five decades, the world of literature has come to venerate the great works of one man. The tremendous contribution of Shakespeare in Literature remains unparalleled. The sheer volume of the plays and sonnets he had written remain unmet, and the quality of its art remains unmatched. So much so, that there is probably no one inhabiting this earth who hasn’t the knowledge of the great writer. No one graduates from school without having the experience of Shakespeare in their education: his plays are celebrated through staging and his works are the subject of study in, and even outside of, Literature classes. Also, the celebration of Shakespeare and his works are not limited to the confines of education. Theatrical companies earn a sizeable proportion of their profits in staging Shakespeare’s five-century old works. Publishing companies benefit largely in the millions of hardbound copies they have printed of Shakespeare’s works, and the literature he and his works have inspired. With the picture that has been painted, we can see how influential and how big a pillar Shakespeare is in Literature. However, with the exception of literary scholars, not many people are aware of the issue that has surrounded Shakespeare’s authorship of the works that have been claimed to be his since the time man can remember. William Shakespeare of Stratford has always been regarded as the man who wrote the immortal plays and sonnets. But ever since speculations have started to arise, various names have also mushroomed through the investigations of scholars who claim that these names are the ones which we should be celebrating, and not that of the businessman William Shakespeare of Stratford. The speculations started when Alexander Pope brought to the attention of readers the authenticity of the attribution to Shakespeare in a number of his works. Pope attacked Shakespeare’s on the genuineness of works that had been excluded from the 1623 Folio, a collection of Shakespeare’s most compelling works. His criticisms made in the 17th century continued to influence the generations that followed with respect to their opinion on the matter. Primarily though, what has unsettled critics are the dissonance in his the experiences and education received by a theater man in Stratford and the quality and content of the works he allegedly produced, as stated by one source, â€Å"The work attributed to Shakespeare shows a knowledge of geography, foreign language, politics, and an immense vocabulary that many find inconsistent with what’s known about Shakespeare’s education,† (Lanciai). Authorship Majority of the investigations were done through a historical point of view. If we take a look back in history during the time Shakespeare wrote his plays, we would find out how authorship was perceived as insignificant, even illegitimate, in the writing of the book. According to another source, traditional narratives that present the Middle Ages as a ‘golden age’ of forgery for which questions of authorship and authenticity were unimportant (King). What triggered this was the inability of novice writers (especially people of rank) to publish their own name in their works under the regime of Queen Elizabeth. A gentleman of rank could not publish under his own name lest he be suspected of having a profession. This policy was followed, and writers of rank either circulated their work privately or they made use of pen-names (Lanciai Christian). Also, the theater industry during Shakespeare’s time was an unsurveyable community (Lanciai). It therefore follows that while theater was an important industry of the era, it is very challenging to examine the works of the industry. These reasons ultimately lead to the graying of the trace to the real authorship of the works attributed to Shakespeare. Why not Shakespeare? It has been mentioned in this essay that the theater industry was an unsurveyable community during Shakespeare’s time. A piece of information that is known though is that the owners of the theaters were communally owned by the actors, according to Lanciai’s article. Only the exceptional rise in the business, and William Shakespeare was one of them, as he was an accomplished capitalist of those times. Therefore, we can surmise that Shakespeare the businessman was a person considered of rank in his age. If we remember the rule that was imposed on writers of rank, another source argued thus: â€Å"If Shakespeare was a gentleman of rank, then William Shakespeare could not he his real name. By contrast, the William Shakespeare who was a play-broker, part owner of an acting company, and resident of Stratford as well as London would have been in a good position to use and appropriate work written by an anonymous high-born author,† (Price, Diana). How Shakespeare was perceived The man’s (Shakespeare of Stratford) social and professional position in question was described by Pope as this: â€Å"He writ to the People; and writ at first without patronage from the better sort, and therefore without aims of pleasing them: without assistance or advice from the Learned, as without the advantage of education or acquaintance among them: [and] without the knowledge of the best models, the Ancients, to inspire him†¦Ã¢â‚¬  From this description, King surmised that Pope regarded the dialogue of the actors in his works as â€Å"bad conversations†, and that he was only able to get away with this because of the Court patronage. Also, he had drawn from the quote that the quality of Shakespeare’s dramatic writing improved in direct proportion to his level of social and linguistic contact with ‘the better sort’. With this we can already see how Pope has de-merited Shakespeare from the level of literary genius which has always been associated to his name. It also evident that Pope deemed Shakespeare of this position because of the social position he was in, as according to the same article, Shakespeare’s social contamination by his inferior associates and conversation partners contributed to the de-meriting. An argument from another author supported Pope’s claims when another author said, â€Å"It appears that Shakespeare of Stratford was not much respected (or liked) while Shakespeare the author was† (Price). The other side of Shakespeare of Stratford that Pope pointed out in concurs with the knowledge of the author. According to Price’s book, Shakespeare of Stratford was identified by contemporary documents as a money-lender, play-broker, wheeler-dealer, social climber, and sometime actor. No contemporaries of Shakespeare called him as an author, not even people from his community. What also strengthens this argument is the lack of surviving documents written by him which have any literary significance (Price). Aside from these, what’s also disturbing for scholars is the fact that the will left by Shakespeare did not mention of any books that he owned. In Elizabethan period, books were considered important items and therefore were to be bequeathed to relatives or fellow writers. His passing also spoke of his merit as a celebrated modern playwright in his time. Unlike other playwrights, his death did not stir any public notice. Add to that the issue brought about the will he left behind, these things make a lot of people wonder about his merit as a writer. It seems that his will was the only trace of Shakespeare’s literary works. A man named Reverend James Wilmot was said to have searched all of Warwickshire to look for any piece of evidence that would present Shakespeare’s literary activity. Reverend Wilmot did not find any anecdote, letter, document or any memento (Lanciai). Surely, anyone who is claimed to be a writer will have volumes of writings in his home, or any piece of writing at all. The article also explained that Reverend Wilmot’s discovery led him to conclude that Shakespeare really must have another writer. His education also proved nothing but extraordinary. According to Price’s book also, the businessman from Stratford only acquired a grammar-school education at most. While possible, it is difficult to believe that a person of such educational attainment could produce the level of intellect and cultivation found in his works. It is almost unquestionable when one makes the claim that Shakespeare’s works have shaped the way English dramas are to be written, as put by another source, â€Å"He creates and establishes the English verse drama, he gradually develops the English drama into the form which subsequently and invariably becomes the Shakespeare standard (Leahy, William). † This particular writer is one with the critics who says it is impossible that these works of great quality could have been produced by a man with little educational background. Leahy added in his article, â€Å"It’s not likely that Shakespeare could master this form directly without preparatory work in such an accomplished professionalism which is already evident in the first Shakespeare dramas. † What made him say this is due to his non-existent education and lack of experience of Cambridge, France, and Italy. Aside from this, Price adds how scholars point out that his knowledge of several foreign languages is deemed dubious. The article explained that there is no indication that Shakespeare knew any languages other than English, or that he ever left England. The discrepancy between the images of the two persons has fuelled the debates for the authenticity of the businessman from Stratford’s authorship in the Shakespearian works. The Real Shakespeare Among the numerous strings of allegations and speculations regarding Shakespeare of Stratford’s merit to claiming authorship to a number of literary works, a lot of names have also surfaced. Among these people was Francis Beaumont, a young dramatist who passed away in the same year William Shakespeare died. As death could sometimes speak of the greatness of a person, we could surely say that Beaumont was considered as one of the significant people in English drama. The whole of England mourned for his death and paid tribute to the dramatist. Aside from this young dramatist, another man is claimed to be the real Shakespeare. Ben Jonson, who also completely dominates the preface to the first edition of the complete works of Shakespeare, which appeared in 1623, is also suspected to be the real author of the plays (Lanciai). Lanciai adds that Ben Jonson himself has published his complete works first, which could have led him to think that the Shakespeare dramas should also be published. In addition, Christopher Marlowe has been alleged to be the original Shakespeare. Born in Canterbury, he was a learned man who received his education in the King’s School Canterbury, as well as Corpus Christi College, Cambridge through scholarships. The resonance with the quality of education has convinced many scholars, but what was more convincing was the practice he was able to gain in translations, poetry, and playwrighting (Oleg, et al). Lanciai also mentions another probable author to the works in question. After the discovery of Reverend Wilmot regarding the absence of Shakespeare’s literary work, the Reverend believed that a man named Francis Bacon should be recognized as the authentic author. The Reverend concluded that Shakespeare must have been the protective name for Bacon. According still to Lanciai’s article, Bacon’s education, experience and knowledgeableness could be better reconciled with the intellectual level exhibited by the works. Also, as the authorship clearly indicates that the experience were collected from at least the Cambridge university, Italy, and France, Bacon proved to be a probable candidate to the authorship as he had extensively went to these places. To add, Bacon’s education allowed him a position as an ambassador and to also serve as a member of the House of Commons. He was knighted and moved to higher political positions after the ascension of James VI (Oleg, et. al) In conclusion, the works of Shakespeare are not to be questioned with respect to the contribution in Literature and the quality of art that it contains. While the question of the Shakespeare authorship has been around for hundreds of years and is therefore a very important matter to be settled, it would be more important and more contributory if aspiring writers who are inspired by these works to focus their attention to â€Å"what† and not as to the† who. † Works Cited: King, Edmund G. C.. In the Character of Shakespeare: Canon, Authorship, and Attribution in Eighteenth-Century England Lanciai, Christian. A Summary of the Shakespeare Problems. Research Journal Volume 06 2009 Online Research Journal Article. The Marlowe Society. 2009 Price, Diana. Shakespeares Unorthodox Biography: New Evidence of an Authorship Problem Seletsky, Oleg, Huang, Tiger, Henderson-Frost William. The Shakespeare Authorship Question.

Quest for Eternity in the Poetry of Dickinson Essay -- Biography Biogr

Quest for Eternity in the Poetry of Dickinson      Ã‚  Ã‚   Over the past few decades, a considerable number of comments have been made on the idea of eternity in Emily Dickinson's poetry. The following are several examples: Robert Weisbuch's Emily Dickinson's Poetry (1975), Jane Donahue Eberwein's Dickinson: Strategies of Limitation (1985), Dorothy Huff Oberhaus' Emily Dickinson's Fascicles: Method and Meaning (1995), and James McIntosh's Nimble Believing: Dickinson and the Unknown (2000). However, opinions vary as to how Dickinson explored the question regarding eternity; much ink has still been spent on the issue. This paper, therefore, provides another discussion of the idea of eternity depicted in Dickinson's poetry. I will discuss the issue by considering how her poems describe the process through which the poet finally reaches the belief in eternity-overcoming the feud between Christianity and scientific knowledge and that between Romanticism and existentialism.    As a beginning, let us look closely at one of the poems in which Dickinson gives a detailed account of a deathbed scene: The last Night that She lived It was a Common Night Except the Dying-this to Us Made Nature different We noticed smallest things- Things overlooked before By this great light upon our Minds Italicized-as 'twere. As We went out and in Between Her final Room And Rooms where Those to be alive Tomorrow were, a Blame That Others could exist While She must finish quite A Jealousy for Her arose So nearly infinite-- (P-1100)    It is presumed that Dickinson wrote this piece of verse in circa 1886. In May of that year, Laura Dickey, the wife of Frank W. of Michigan, ... ...Dickinson. 2 vols. 1974. Cambridge: Harvard UP, 1994. Stocks, Kenneth. Emily Dickinson and the Modern Consciousness. Hong Kong: Macmillan, 1988. Wolff, Cynthia Griffin. Emily Dickinson. 1986. Reading: Addison, 1988. Works Consulted Kjaer, Niels Pastor. "The Poet of Moment: Emily Dickinson and Soren Kierkegaard." Dickinson Studies 59 (1986): 46-9. McIntosh, James. Nimble Believing: Dickinson and the Unknown. Ann Arbor: U of Michigan P, 2000. Oberhaus, Dorothy Huff. Emily Dickinson's Fascicles: Method and Meaning. University Park: Pennsylvania State UP, 1995. Rosenbaum, S. P., ed. A Concordance to the Poems of Emily Dickinson. Ithaca: Cornell UP, 1964. Scholnick, Robert J., ed. American Literature and Science. Lexington: UP of Kentucky, 1992. Weisbuch, Robert. Emily Dickinson's Poetry. Chicago: Chicago UP, 1975.   

Four Contexts That Motivate Learning

The four contexts that motivate learning are practical context, personal context, experiential context, and idealistic context. Practical context is doing something because it is what’s expected to be beneficial to succeed. The motivation is the strategic thinking to get to the point and not waste time. Personal context is setting goals for yourself to better your life or possibly the things in it. The motivation could be family or even just the satisfaction of self-achievement. Experiential context learning is learning from experience.The motivation is learning from your past experience and reintegrating it into a teaching skill for future knowledge. Idealistic context is a learning that involves exploring new ideas, theories, and concepts. The motivation is the curiosity to experience the discovery of something new. One must find the learning context that expresses them best. Personal context best motivates my learning. I like to accomplish goals I set for myself. My main go al is to make sure I can provide a better life for my children. By doing this I have to first start school and then find a good career.I tried to settle for medical assisting but the problem was simply that I was settling. My goal is to quit procrastinating and do more with my life. I have it set in my mind my children deserve the best and I am willing to do all I can to give it to them. I know I have to push myself to get through this journey. This makes the learning process easier. When I feel overwhelmed I remember my goals I have set for myself. My main personal goal is to finish school and obtain a good paying job to provide for my family and myself.

Palm Hospital Notes

Palms Hospital (Traditional Project Analysis) Palms Hospital * 250 bed capacity; investor owned; Islamorada, Florida * Founded in 1946 by Rob Winslow, went back in 1967 after the war * High economic growth, population expansion Acknowledged to be one of the leading healthcare providers in the area * Currently evaluating a proposed ambulatory (outpatient) surgery centre * More than 80% o all outpatient surgery is performed by specialists * Minor procedures take about one hour or less, major procedures take two or more hours * About 60 percent of the procedures are performed under general anesthesia, 30 percent under local anesthesia, 10 percent under regional or spinal anesthesia * Operating rooms built in pairs for prep and surgery efficiency * Outpatient surgery market has experienced significant growth since the first ambulatory centre opened in 1970; 1990 – 2. million surgeries, 2009 – more than 20 million surgeries * Growth was fueled by three factors: rapid advance ments in technology made it possible for inpatient surgeries to be performed as outpatient surgeries,; Medicare has been aggressive in approving new minimally invasive surgery techniques, meaning number of Medicare patients who use outpatient surgery services has grown substantially; patients prefer outpatient surgeries for convenience, and third party payers prefer them for less cost * Inpatient surgery numbers have been flat due to these factors over the last 20 years; outpatient procedures grow at 10% annually * No other outpatient surgery centre exists in Palms Hospital’s immediate environment, but rumors about physician owned facilities are surfacing * Palms Hospital owns a land adjacent to the facility that would be a perfect location for the new ambulatory surgery centre; the land was bought for $150,000, spent $25,000 to clear the land (also expensed for tax purposes) to put sewer and utility lines. If sold today, the land will ring in $200,000. * The supposed buildin g will house four operating suites that will cost $5,000,000 plus another $5,000,000 for equipment costs for a total of $10,000,000. *Note: the building and the equipment fall into the modified accelerated cost recovery system (MACRS) five-year class for tax depreciation purposes; in reality, the building has to be depreciated over a longer period than the quipment * Although the project may have a longer life, the hospital assumes a five-year life in its capital budgeting analyses and then approximates the value of the cash flows beyond year 5 by including a terminal/salvage value in the analysis; to estimate this value, the hospital uses the market value of the building and equipment after five years, which in this case is $5M before taxes, excluding land value. *Note: taxes must be paid on the difference between an asset’s salvage value and tax book value at termination; for example, if an asset that cost $10,000 is depreciated to $5,000 and then sold for $7,000, the firm owes taxes on the $2,000 excess in salvage value over tax book value * Expected volume for this centre is 20 procedures a day, with an average charge of $1,500 but charity care, bad debts, managed care plan discounts and other allowances lower the net revenue amount to $1,000; the centre will be open 5 days a week, 50 weeks a year, 250 days out of the year.Labor costs are expected to run at $918,000 a year excluding fringe benefits; utility costs run at $50,000 a year * If the centre is built, hospital’s cash overhead will increase by $36,000 annually, primarily for housekeeping, building and grounds maintenance; centre will be allocated $25,000 of the hospital’s current $2. 8M administrative overhead costs. On average, each procedure will require $200 in expendable medical supplies, including anesthetics. The hospital’s inventories and receivables, as well as accruals and payables will increase. Overall change in net working capital is expected to be small, the refore not imperative to the analysis. The hospital’s tax rate is 40%. * Inflation – one of the most difficult factors to deal with in project analysis. Input costs and charges have been rising at twice the rate of overall inflation. Inflationary pressures are highly variable.Analysis is started by assuming that both revenues and costs, except for depreciation, will increase at a constant rate – which they project will be at 3%. * Board members’ concerns – wants to make sure that a complete risk analysis including sensitivity and scenario analysis is performed before the proposal is presented (board was forced to close a daycare that appeared to be profitable but turned out to be a big money loser – 2 years ago) * Another concern would be the impact of the centre on the current volume of inpatient surgeries. Surgery department head projected that the outpatient surgery centre could siphon off up to $1,000,000 in cash revenues annually, hat c ould lead to a $500,000 reduction in annual cash expenses * The data developed for risk analysis were as follows: three input variables are highly uncertain – number of procedures per day, average revenue per procedure, building/equipment salvage value. If another centre was built to compete with theirs, number of procedures could be as low as 10 a day, but if acceptance to their centre is strong, they could be doing 25 procedures a day. * Net average revenue (cost of procedure) is $1000. But if surgery severity is high, net average revenue could be $1,200. If severity is low, it could be $800. If real estate and medical equipment values stay strong, salvage value could be as high as $6M, but if it weakens, it’ll be as low as $4M – considering that the average salvage value is $5M. Another board member question why the scenario analysis only had three scenarios and suggested 5 or 7. * Based on historical scenario analysis data that use best case, worst case, and most likely, the hospital’s average project has a coefficient of variation of NPV (net present value) in the range of 1. 0-2. 0 and the hospital typically adds or subtracts 4 percentage points to its 10 percent corporate cost of capital to adjust for differential project risk. * Note: the case asks us to conduct complete project analysis and present findings. It suggests the application of Monte Carlo simulation (but that is bullshit because that’s the simulation you need a computer software for).