The Ruthenium Red Test Biology Essay

The Ruthenium Red Test Biology Essay This test is subjected to identification of carbohydrates. 1 w/v dispersion of test substance was prepared in distilled water. Test mixture was combined with a small amount of molischs reagent in a test tube. After mixing, small amount of concentrated sulphuric acid was slowly added down the sides of the sloping test tube to obtain violet ring at junction. 5.2.1.4. Ninhydrin test This test is subjected to identification of proteins. 2 ml aqueous solution of test substance and 1 ml alcoholic ninhydrin solution was mixed in test tube and heated at 80Â ° C for 5 min to obtain red color. 5.2.1.5. Test with iodine This test is subjected to identification of non reducing polysachharides (starch). 1 % w/v dispersion of test substance was prepared in distilled water. 3 ml test solution and few drops of dilute Iodine solution were mixed to obtain blue color after cooling and no color after heating. 5.2.1.6. Biuret test This test is subjected to identification of proteins. 1 % w/v dispersion of test substance was prepared in distilled water. 3 ml test solution, 1 ml 4% sodium hydroxide and 2 drops of copper sulphate solution were mixed to obtain violet to pink. 5.2.1.7. Salkowski test This test is subjected to identification of steroids. 1 % w/v dispersion of test substance was prepared in distilled water. 2 ml test solution, 2 ml chloroform and 2 ml conc. sulphuric acid were mixed and shaken well to obtain red colored chloroform layer and greenish yellow fluorescence in acid layer. 5.2.1.8. Baljet test This test is subjected to identification of glycosides. 1 % w/v dispersion of test substance was prepared in distilled water. 2ml test solution and 2 ml sodium picrate was mixed in test tube to obtain yellow to orange color. 5.2.1.9. Shinoda test This test is subjected to identification of flavonoids. 1 % w/v dispersion of test substance was prepared in distilled water. 3 ml test substance, 5 ml 95% ethanol, 2 drops of Conc. HCl and 0.5 g magnesium turnings were mixed to obtain pink color. 5.2.1.10. Wagners test This test is subjected to identification of alkaloids. 1 % w/v dispersion of test substance was prepared in distilled water and filtered. 3 ml test solution filtrate was mixed with 2 drops of Wagners reagent to obtain reddish brown precipitate. 5.2.1.11. Test with acetic acid solution This test is subjected to identification of alkaloids. 1 % w/v dispersion of test substance was prepared in distilled water. 2 ml test solution and acetic acid solution were mixed to obtain red color. 5.2.2. Physicochemical studies123 5.2.2.1. Viscosity 1% w/v solution of test substance was prepared in distilled water and 0.1 N HCl separately. Solutions were kept at 37 Â ± 2 Â °C for 6 hours. Viscosity of test solutions determined using Brookfield viscometer using spindle no. 3 at 50 rpm (Model No. DV-E). 5.2.2.2. pH determination124 1 % w/v dispersion of test substance in distilled water was prepared by shaking for 30 min and the pH determined using a pH meter (Elico). 5.2.2.3. Swelling Index88 Swelling index is the volume in ml occupied by 1 g of a drug, including any adhering mucilage, after it has swollen in an aqueous liquid for 4 hours. 1 g test substance (Fine powder) was placed in 25 ml ground glass stoppered measuring cylinder with graduations in 0.5 ml divisions. The test substance was moistened with 1.0 ml of 96% ethanol and 25 ml distilled water was added. Cylinder was closed using stopper. Cylinder was shaken every 10 min time interval for 1 hour and then was allowed to stand for 3 hours. Volume occupied by the test sample was determined in ml after decanting the supernatant clear liquid. Swelling index was calculated from average of three tests. Same experiment was performed using 25 ml 0.1 N hydrochloric acid instead of distilled water. Swelling index was calculated using following equation. Vt = Volume occupied by test substance after hydration, at time 3 hrs. V0 = Volume occupied by test substance before hydration, at time zero. 5.2.2.4. Bulk density123 Bulk Density was determined using Borosil 50 ml measuring cylinder. The volume of 5 gm mucilage powder was noted. Value of Bulk density was calculated by, 5.2.2.5. Tapped density123 Tapped Density was determined using Borosil 50 ml measuring cylinder. The volume of known weight 5gm was noted. The cylinder was given 250 taps on using tapped density apparatus. Value of Tapped density was calculated by 5.2.2.6. Carrs compressibility index123 Carrs compressibility index of AER mucilage powder was calculated from respective tapped density and bulk density by, 5.2.2.7. Loss on drying88 In flat bottom dish, 50 mm in diameter and 30 mm in height, 1 g fine powdered test substance dried in oven at 100-105 C for 3 hours. The test substance was allowed to cool in desiccator over diphosphorus pentoxide for 24 hours and weighed. Percentage loss on drying was calculated by following equation. Weight of empty dish = A g Weight of test substance taken = Y g Weight of dish containing test substance after drying and placing in desiccator = B g Weight of test substance after drying = (B A) g

The Identity of Thomas Pynchon :: Biography Biographies Essays

The Identity of Thomas Pynchon The identity of Thomas Pynchon is as elusive as the sticky, complex webs of meaning woven into his prose. As America's most "famous" hidden author, Pynchon produces works which simultaneously deal with issues of disappearance and meaning, of identity and nothingness in a fashion that befuddles some and delights others. He speaks to the world from his invisible pulpit, hiding behind a curtain of anonymity that safely disguises his personality from the prying eyes of critics and fans alike. Without a public author presence, readers are forced to derive the identity of the author instead from the author's actual works. When searching for the identity of Pynchon, and indeed the notion of identity itself, the novels of Thomas Pynchon offer an interesting starting point. Questions of identity and meaning are shrouded beneath a veil of conspiracy in The Crying of Lot 49, Pynchon's second novel and his shortest. Throughout the novel there are snatches of hidden agendas and mysterious plans; it is a world run by Pierce Inverarity, a character who is dead when the novel opens yet remains an active presence throughout the work. This seems to fit Pynchon's situation rather nicely as the ghostly moderator of a tired world, leading his main character Oedipa Maas on a quest for meaning while blindly groping for clues about a conspiratorial mail system known only as the Trystero. Oedipa's quest echos the quest of everyone; she wishes for an identity that makes some sense within the framework of her world. Thomas Pynchon, by erasing himself from the public sphere, is questing for identity in his own right through his writings, letting Mrs. Maas do the searching for him. Little is known about Pynchon's life, and no one who knows him seems to be willing to add to the miniscule pile of information currently available about him. His most recent published photograph dates back to 1953. Beginning at the beginning, he was born on May 8, 1937 in Glen Cove, New York. He attended Cornell University and received a degree in English in 1959. He worked at Boeing Company in Seattle as a technical writer until his first novel V. appeared in 1963 (Gray 70). From that point onward, Pynchon vanished from the public eye. Information about any part of Pynchon's life after V. The Identity of Thomas Pynchon :: Biography Biographies Essays The Identity of Thomas Pynchon The identity of Thomas Pynchon is as elusive as the sticky, complex webs of meaning woven into his prose. As America's most "famous" hidden author, Pynchon produces works which simultaneously deal with issues of disappearance and meaning, of identity and nothingness in a fashion that befuddles some and delights others. He speaks to the world from his invisible pulpit, hiding behind a curtain of anonymity that safely disguises his personality from the prying eyes of critics and fans alike. Without a public author presence, readers are forced to derive the identity of the author instead from the author's actual works. When searching for the identity of Pynchon, and indeed the notion of identity itself, the novels of Thomas Pynchon offer an interesting starting point. Questions of identity and meaning are shrouded beneath a veil of conspiracy in The Crying of Lot 49, Pynchon's second novel and his shortest. Throughout the novel there are snatches of hidden agendas and mysterious plans; it is a world run by Pierce Inverarity, a character who is dead when the novel opens yet remains an active presence throughout the work. This seems to fit Pynchon's situation rather nicely as the ghostly moderator of a tired world, leading his main character Oedipa Maas on a quest for meaning while blindly groping for clues about a conspiratorial mail system known only as the Trystero. Oedipa's quest echos the quest of everyone; she wishes for an identity that makes some sense within the framework of her world. Thomas Pynchon, by erasing himself from the public sphere, is questing for identity in his own right through his writings, letting Mrs. Maas do the searching for him. Little is known about Pynchon's life, and no one who knows him seems to be willing to add to the miniscule pile of information currently available about him. His most recent published photograph dates back to 1953. Beginning at the beginning, he was born on May 8, 1937 in Glen Cove, New York. He attended Cornell University and received a degree in English in 1959. He worked at Boeing Company in Seattle as a technical writer until his first novel V. appeared in 1963 (Gray 70). From that point onward, Pynchon vanished from the public eye. Information about any part of Pynchon's life after V.

Why Cosmetology

I haven't had an actual job related to this career, other than doing freelance Jobs when asked to. It is because of the freelance work Vive done that I decided to take this career path for now. I thought to myself, why not make more money off something I do already anyway? Like Jessica, from Real Stories, I have changed my mind a lot about the kind of career I want to. One thing I am sure of now though Is that I don't want to be a cosmetologist for the rest of my life.I can definitely see myself In a Job that Is unrelated to Cosmetology. My goal Is to make a change in people's lives, and I feel Like this Is one way of doing that. If making people feel better about their appearance gives them self-confidence, I have done my lob. This relates to the career I actually want which Is to be a Youth Probation Officer because I want to make a change In young people at an early age. A cosmetologist and a probation officer are two completely different careers, but when you really hint about it they both try and make an impact in people's lives.I am sometimes concerned that I will go through what Jessica from Real Stories went through. I am scared that the career I want is nothing like what I expected. If I were Jessica I would have done more research on the work environment of the job. Online research is always good, but there is nothing like interviewing someone that is exactly where you want to be. They have been there and can tell you exactly what to expect. We should always have options in life.I personally get bored of the same routine. This could affect my decision of the career I want in the long run. So, I think it is a good idea to attend graduate school to expand our options. We never know how a job really is until we actually start working it. It doesn't matter the amount of research we do on a specific career because everyone's experience is different. We are individuals, and some might love it and others might hate it. We should always have options and be pr epared.

Comparing Updikes AP and Joyces Araby Essay - 1336 Words

Comparing Updikes A P and Joyces Araby John Updikes A P and James Joyces Araby share many of the same literary traits. The primary focus of the two stories revolves around a young man who is compelled to decipher the difference between cruel reality and the fantasies of romance that play in his head. That the man does, indeed, discover the difference is what sets him off into emotional collapse. One of the main similarities between the two stories is the fact that the main character, who is also the protagonist, has built up incredible, yet unrealistic, expectations of women, having focused upon one in particular towards which he places all his unrequited affection. The expectation these men hold when finally face†¦show more content†¦Both stories delve into the unstable psyche of a young man who is faced with one of lifes most difficult lessons: that things are not always as they appear to be. Telling the tale as a way of looking back on his life, the protagonist allows the reader to follow his lifes lessons as they are learned, imparting upon the audience all the emotional pain and suffering endured for each one. The primary focal point is the young mans love for a completely unattainable girl who unknowingly riles the man into such a sexual and emotional frenzy that he begins to confuse sexual impulses for those of honor and chivalry (Wells, 1993, p. 127). It is this very situation of self-deception upon which both stories concentrate that brings the young man to his emotional knees as he is forced to compensate for the emptiness and longing in the young boys life (Norris 309). As much as Updikes rendition is different from Joyces original work, the two pieces are as closely related as any literary writings can be. Specifically addressing details, it can be argued that Updike missed no opportunity to fashion A P as much after Araby as possible. For example, one aspect of womanhood that fascinates and intrigues both young men is the whiteness of the girls skin. This explicit detail is n ot to be taken lightly in either piece, for the implication is integral to the other important story elements, particularly as they deal with female obsession. FocusingShow MoreRelatedThe Stages of Maturation in James Joyce’s Araby John Updikes AP from the Authors Perspective902 Words   |  4 PagesWhen comparing the views of both James Joyce and John Updike on maturation from adolescence to adulthood it will be important to continually compare two of their similar works in Joyce’s â€Å"Araby† and Updike’s â€Å"AP†. James Joyce and John Updike follow similar views with the latter using Joyce as a foundation and following in similar footsteps; both authors follow a process of maturation based on the allure of love, while doing it at different stages of each of the protagonists’ lives resulting in similarRead MoreHow Cultural Expectations Affect Both Men And Women1264 Words   |  6 PagesDivergent series’ respectively, some autho rs take a more realistic approach. James Joyce’s unnamed narrator in his short story Araby and John Updike’s Sammy from AP are both affected by the gender roles in an unorthodox way that shows how cultural expectations affect both men and women. Both characters used the opposite sex as an escape from their current realities, but are disappointed in the end. In AP, John Updike’s character experiences firsthand the negative effect of society’s expectations of

The Value of Diversity - 603 Words

1. There are a number of different methods of teaching employees about the value of diversity. Elmore (1997) suggests that we undertake activities that cause us to evaluate ourselves both as individuals and as members of a group. Additionally, exercises that highlight the negativity that stereotyping and discrimination brings can be valuable. Elmore also suggests that we examine both the similarities and differences in people. Workshops can help because they encourage interaction on a human level, so that some of these lessons need not be overtly explained until the end. This strategy will allow for growth and learning both during the exercise and afterwards as well. 2. Alkhalifa (2008) notes that limited perception occurs when reception mechanisms in the brain place a limit on the amount of information that is received. When applied to other people, it results in us seeing those other people in an incomplete way, and sometimes filling in the unseen aspects with shorthand like stereotypes. Often, when we have a limited perception of another person, we received a distorted view of that persons traits and abilities. In many instances, the perception that we have is inaccurate. As we interact more with that person, we may have a greater opportunity for our brains to make evaluations, and with this greater processing our perceptions of the person become less limited and more accurate. 3. It is important to have employees that are diversity conscious in order to ensure aShow MoreRelatedValue of Diversity Paper1213 Words   |  5 PagesRunning head: VALUE OF DIVERSITY PAPER Value of Diversity Paper Cultural Diversity SOC/315 Value of Diversity in the Workplace In companies or corporations the global landscape now reflects diversity in the employees found in the workplace. Employees come from different backgrounds, geographic or global areas, ethnic and cultural origins, and have unique skills and talents. Individuals must work together and merge skills and manage diversity effectively in the workplace. Our thoughts, actionsRead MoreEssay on The Value of Diversity522 Words   |  3 Pages Diversity, as it relates to thoughts, ideas, ethnicity, race, and a host of other areas, is the quintessential ingredient needed to establish a free nation. Amendment I of the United States Constitution states, Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances. Through thisRead MoreAn Organization Of Values Diversity1656 Words   |  7 PagesAn organisation that values diversity will gain a positive reputation, the way it’s seen by potential employees and organisations. Valuing diversity can attract candidates it shows an organisation practises employment discrimination; in line with the Equality Act 2010 protecting employees against discrimination, race, age, gender, ethnicity, disability, religion or sexuality. If a company wishes to expand worldwide, a diverse workforce can improve communication between countries that they may wishRead MoreDiversity, Values, And Beliefs1920 Words   |  8 PagesMelissa Rahorst CRIM 406 20170419 Attitudes, Values, and Beliefs Equal Opportunity Leaders Course (EOLC) is a course that focuses on giving soldiers a voice. EOLC teaches noncommissioned officers and officers to empower even the lowest ranking soldier to speak up if they are being discriminated against based on the six categories of discrimination. Throughout this course, I learned many valuable lessons, but the most important exercise we did was called the badge exercise. During this exerciseRead MoreThe Value of Diversity in the Workplace Essay808 Words   |  4 Pagescustomers for which they serve while determining the needs of these customers. This business process makes diversity a crucial part of a companys growth and operation. Hiring and retaining employees with diverse backgrounds to meet the demands of the global marketplace is the first step to meeting these challenges. Companies like EBS PaineWebber (Grano, 1999) have committed themselves to diversity so that they can establish themselves as a diverse organization ready to meet the needs of a diverse groupRead MoreThe Value Of Diversity Within The Workplace1163 Words   |  5 PagesThe Value of Diversity in the Workplace Globalization sets the perfect environment to develop diversity in the workplace. This new society, in which we are currently living, has created a new workforce that is based on its diversity that can greatly help with any business development and growth. In business, diversity brings opportunities to grow, expand and reach out to other markets by utilizing the values, ideas and the diverse skills that people from many different backgrounds have to offer.Read MoreThe Value Of Diversity At Washburn University1254 Words   |  6 Pages Washburn University has always been proud of having diversity since it first opened its doors to the public 151 years ago. If you are to look around campus many are able to see how much diversity is valued by the campus as a whole, they know everyone is different and each person has their own story to tell. If a university made it where no one is allowed to talk about where they came before and how they ended up where they are in life. what is the poi nt of being proud of who you are? For me, itRead MoreAsian Values And Cultural Diversity2375 Words   |  10 Pagesterm Asian Values has various definitions. Generally, the phrase alludes to influences from Confucianism in particular, filial piety or loyalty towards the family, corporation, and nation; the forgoing of personal freedom for the sake of society s stability and prosperity; the pursuit of academic and technological excellence; and, a strong work ethic together with thrift. Proponents of so-called Asian values, who tend to support Asian style authoritarian governments claim these values are moreRead MoreThe Diversity Of Diversity, Values, And Perceptions Of Different Communities And Cultures Essay1165 Words   |  5 PagesAccording to the SJSU Communication Studies department, â€Å"Diversity explores the variety and complexity of communication efforts to shape beliefs, values, and perceptions in different communities and cultures.† Diversity is one of the four major cornerstones in the department, and although each and every cornerstone speaks to me, diversity is critical to me because it is what made me who I am today. I was born and raised in one of the most diverse places in the country, the San Francisco Bay AreaRead MoreThe Value Of Ethical Conduct And Managing Diversity Essay1482 Words   |  6 PagesGlobal Issue: The Value of Ethical Conduct and Managing Diversity Review of Subject This essay explores what Organizational Behavior (OB) is and the value of ethical conduct, and discusses the methods of managing diversity taking into consideration socializing and organization culture. OB is a study of the people in organization, about how they work, and how they produce results. Organizational ethical conducts are those morally accepted by the employees, the customers, and the public. It could

William Faulkners Race Essay - 1358 Words

William Faulkners Race Works Cited Missing William Faulkner, the eldest son to parents Murry and Maud Butler Falkner, was born in New Albany, Mississippi in 1897. Although Faulkner was not a keen student in high school, which eventually lead to his dropping out before graduation, he was very enthusiastic about undirected learning. After years of studying independently, Faulkner allowed a friend of his family, Phil Stone, to assist him with his academic vocation. This relationship inspired Faulkner and after a short period spent with the Royal Air Force in 1918 he decided to go to university where he began writing and publishing poetry. In 1924 Stone’s financial assistance helped Faulkner publish a†¦show more content†¦Oxford provided Faulkner with intimate access to the rich character of the rural south which was conscious of its past and separated from the urban-industrial mainstream that Faulkner found very distracting. He wanted to accurately portray life in the south and he â€Å"could not have done other wise than to include Blacks among the people who inhabit the lands of his novels†(Glissant, pp. 56). Faulkner did not pretend to understand the suffering and complexity of the lives of the black community but, because he grew up witnessing their struggle he was able to represent them in an honest and sometimes brutal fashion. He spent his whole life in the south and, â€Å"Blacks lived there †¦ They were servants in the Falkner family or perhaps workers for the railroad company founded by his great grand-father. They were surely mule drivers or farm laborers †¦Ã¢â‚¬ (Urgo and Abadie, pp. 137). It is difficult to say whether or not Faulkner felt sympathy for these people but it is clear through Faulkner’s writing that he believed their story needed to be told. It is easy to understand why Faulkner included Black characters in his novels, however, the question of how he portrays them still remains. In 1929, inspired by the unavoidable racial intermingling occurring in the south at this time, Faulkner produced one of his greatest works, The Sound and The Fury. In the fourthShow MoreRelatedRace Relations and Environmental Destruction in William Faulkners Go Down, Moses 835 Words   |  3 Pagescontinues with an insatiable hunger to rule over other human beings. William Faulkner, in his novel Go Down, Moses, explores the racial tensions and disastrous environmental results that arose in the South when humankind, believing in this lie, tried to dominate and capitalize off nature and its fellow man. Faulkner attributes the decline of the American South to its economic exploitations and its racial oppression. In â€Å"Touching Race in Go Down, Moses† John T. Matthews argues that these two elementsRead More William Faulkner Essay1215 Words   |  5 Pages William Faulkner nbsp;nbsp;nbsp;nbsp;nbsp;William Faulkner is one of Americas most talked about writers and his work should be included in any literary canon for several reasons. After reading a few of his short stories, it becomes clear that Faulkners works have uniqueness to them. One of the qualities that make William Faulkners writings different is his close connection with the South. Gwendolyn Charbnier states, Besides the sociological factors that influence Faulkners work, biographicalRead MoreEssay about William Faulkner1303 Words   |  6 Pages William Faulkner nbsp;nbsp;nbsp;nbsp;nbsp; Although leading the life of an educated writer William Culbert Faulkner experienced the times of his life as a Hollywood writer. Probably known as the most famous writer/author of his time Faulkner adapted to his new lifestyles rapidly, and still remained well known in both the movie and book industries. nbsp;nbsp;nbsp;nbsp;nbsp;Faulkner was born September 25, 1897 in New Albany, Mississippi. His named was inherited from his grandfather WilliamRead More Race, gender and class in Faulkners Literature Essay862 Words   |  4 PagesWilliam Faulkner’s short story A Rose for Emily depicts the need for a hierarchy by which to rank and organize individuals by merit of their importance. Class, gender and race each play a vital role in determining the interactions of Jefferson’s residents. Notably, these issues affect how Emily Grierson, Homer Barron, and Emily’s Negro servant Tobe are treated by the townspeople, as well as their behavior. Together race, gender and class portray and define the characters for who they are and actRead MoreEssay about Faulkners Condemnation of the South in Absalom, Absalom1353 Words   |  6 PagesFaulkners Condemnation of the South in Absalom, Absalom       William Faulkner came from an old, proud, and distinguished Mississippi family, which included a governor, a colonel in the Confederate army, and notable business pioneers.   Through his experiences from growing up in the old South, Faulkner has been able to express the values of the South through his characters. William Faulkners Absalom, Absalom offers a strong condemnation of the mores and morals of theRead MoreIntruder in the Dust806 Words   |  4 PagesIn William Faulkner’s novel, Intruder in the Dust, racism at the beginning of the civil rights movement is a key theme. During this time period in the South, people were expected to behave a certain way towards those whose skin was different form their own. However, in this novel, William Faulkner defies the norm by creating friendships between those of opposing races. The friendships between Charles Mallison and Lucas Beauchamp, Miss Eunice Habersham and Molly Beauchamp, and Charles Mallison andRead MoreThe Past Is Not Dead Essay1407 Words   |  6 PagesThe Past is NOT Dead Octavia E. Butler’s Kindred is a novel that perfectly channels the mean of William Faulkner s claim that the past is not dead; it s not even past.† To me this quote basically means that the past cannot become the past because events keep repeating throughout history. This quote is shown to us through Butler drawing upon the history of transatlantic slavery to illustrate certain ideas and behaviors that are seen throughout time. These ideas and behaviors are specifically seenRead More Crossing the Line in Faulkners Barn Burning Essay970 Words   |  4 PagesCrossing the Line in Faulkners Barn Burning   Ã‚  Ã‚   The American author Joyce Carol Oats, in her Master Race, wrote that our enemy is by tradition our savior (Oats 28).   Oats recognized that we often learn more from our enemy than from ourselves.   Whether the enemy is another warring nation, a more prolific writer, or even the person next door, we often can ascertain a tremendous amount of knowledge by studying that opposite party.   In the same way, literature has always striven to provide anRead More The Other Victim in William Faulkner’s Dry September Essay1710 Words   |  7 PagesThe Other Victim in William Faulkner’s Dry September William Faulkner’s short story Dry September deals with a lynching of a black man, Will Mayes, wrongly accused of attacking a white woman, Minnie Cooper. But Mayes is not the only victim in this short story. Minnie Cooper is also a victim in Dry September. Minnie is as much a victim of the social standards and practices of southern society as Willie Mayes is. While Dry September may seem to be just a story about how a black man is wronglyRead MoreUnderstanding Faulkner s Madness By William Faulkner1385 Words   |  6 PagesUnderstanding Faulkner’s Madness William Faulkner s â€Å" A Rose for Emily † illustrates the extremes that someone may be driven to in the face of the â€Å" loveless † life that Miss Emily’s father created for her by driving away all the potential suitors. The major and minor events in the story help develop the plot idea that in the progress from an aristocratic but romanticized past to a more egalitarian present and future. Emily represents the standards and attitudes of the old south, and her inability

Electrical Distribution System

Question: Discuss about the Report for Electrical Distribution System. Answer: 1 Give a critical analysis of why the ships Low Voltage (LV) power electrical distribution system is of the Insulated neutral type The major requirement ashore is the safety for human. The priority onboard is not at all the safety of the machinery, but the priority is to keep the essential machinery in continuous operation. If because of any earth fault, any of the essential components stops working there are a heavy chances of collision, fire or grounding of the ship. Hence, to avoid such instances insulated neutral type system is used. When using earthed distribution system, if earth fault occurs, it may lead to short circuit across the ship and will blow up the fuses. This short circuit takes place because of double break insulation which allows the connection of the conductors. As these conductors are connected, a very high current flows through which by-passes the loads. In earthed distribution system, only one earth fault is enough to create a hazardous situation. Whereas, in Insulated neutral system, if one earth fault occurs, this will not affect the operation of the circuit and the machinery will operate continuously. If second earth fault takes place, then these two cumulative will result in short circuit and then the process will stop. Thus, two earth faults will be required in Insulated neutral type system to create any such destruction which doesnt happen most likely. It can be concluded that Insulated neutral type system is more effective when compared with any other system. This is reason why Insulated neutral type system is preferred over earthed distribution system. 2 evaluate the importance of programmable logic controllers PLCs to the machinery control and monitoring systems on-board modern tonnage. The machinery control and monitoring system which was previously used onboard doesnt possess the extensive I/O arrangements which are the essential requirement of the current days. The current PLC (Programmable logic controller) gives the access to the programmer to develop and make changes according to the situation. The uses of actuators and sensors have evolved in the recent past just because of the use of PLCs. The PLCs operates the magnetic relay/solenoids, hydraulic cylinders and also the electric motors. The previously used machinery and monitoring system uses the form of instruction list programming which was based on the stack-based logic solver in which the difficultly level of tracking circuit problem was immense. However, after the arrival of PLCs this problem have been eradicated completely. The PLCs uses a simple ladder logic which appears as simple electric circuit diagram. Almost all the operations onboard are done using PLCs. These include processing power, storage, data handing, motion control, sequential relay control which are still evolving day by day. The second importance of PLCs are that it can be armored in extreme conditions too; like, cold, heat, dirt and moisture whereas this is not feasible when we talk about machinery control monitoring system. The PLCs used onboard are different when compared to other PLCs which are used for production purposes or light work. Very high precision PLCs are incorporated within the mechanism of the ship so that there are no any chances of any damage. They are highly customized in order to be operated efficiently and accurately. Any error in the PLC will lead to severe destruction to the system as well as the human present within the system. The next is the cost at which it replaces the other mechanism. PLCs are very economical when compared with the machinery and monitoring system. 3 explain how the electrical power is maintained to the vessels essential operating services if the total generating capacity of the power plant is suddenly reduced, for example by the loss of one of the diesel generators. There are various situations in which the supply from the power plant is suddenly reduced; however this doesnt affect the operation of the vessel. Let us consider the situation of loosing of one generator. As we know that generator is considered to be the heart of the electrical design, it is quite evident that loss if single generator should have also affected the operation of the vessels operation. The generators possess the ability to work on its own and can manage the large system loads swings. There should always be special consideration for the additional operations which might occur suddenly. As per the International maritime regulation, at least two of the generators are required for the electrical power system. Out of which one is driven from the propeller shaft and for the other one, it must have its own prime mover. Considering this situation if one is driven from the shaft of the propeller and the other fails, then this will make the ship non-compliant according to the International regulation. Therefore, in almost all ships the owner opts for three generators. Out of which one will be used for the normal sea load and the other two will be kept as reserve and on standby mode for any uneven fluctuation of loads or any specific maintenance work. As the generator fails, it automatically actuates the standby generator and the electricity is supplied. As the frequency and the voltage are settled, the electricity is supplied to the necessary equipment and machinery one after another. Further, if this standby generator fails to start because of any constraint such as not settling the frequency and voltage, the emergency generator starts up and provides the required power to the machineries. 4 0.5 kg of ice at -5 oC is put into a vessel containing 2 kg of water at 15oC and mixed together, the result being a mixture of ice and water at 0oC. Calculate the final masses of ice and water, taking the water equivalent of the vessel as 0.15 kg. The specific heat of ice is 2.04 kJ/kg K and the latent heat of fusion is 335 kJ/kg. m1=2kg the initial mass of water t1=15C the initial water temperature m2=0.5kg the mass of added ice t2=5C the temperature of added ice Lets solve it out process by process Heat required by ice to change its temperature from -5 to 0 degree Celsius = 0.5 2040 (-5 - 0) = 5100 J Heat required by ice to change its phase = = 0.5 335000 = 167500 J Heat rejected by water to attain temperature of 0 degree Celsius = 2 4186 (15 - 0) = 125580 J Upon further calculation we found out that the final mixture of ice and water will contain 2345 g of water and 155 g of ice. 5 Explain the main properties of Superheated steam and give the reasons why it is used in a marine steam plant where Turbines are used The steam which is at higher temperature than that of its boiling point such that it can be cooled by some amount and will not affect the state of it is called as superheated steam. That is, it will not be converted to a mixture of liquid and saturated vapor even if the temperature is lowered by some value. Superheated steam incorporates with tremendous internal energy which is used for the rotary motion through expansion of it against the reciprocating pistons and turbine blades. The most important property of superheated steam is the ability to release internal energy without decreasing the temperature to the condensation temperature of water vapor. There are various reasons because of which superheated steam is only used in the marine steam plant and are as follows: If we use water vapor, which generally contains some droplets of liquids it will be difficult to compress the water vapor as the liquid droplets are incompressible at those pressure at which the turbine operates. Superheated steam doesnt changes its state even after releasing its internal energy, whereas if the steam is not superheated, then after releasing its energy it will take form of liquid droplets which will incorporate with steam and strike the mechanical components of the turbine. This may force the mechanical components to fracture, crack or bend. Using superheated steam ensures that throughout the passage from the turbine to all its mechanical components of the engine, it remains as a compressible gas and will not damage any parts of the engine. 6 Describe how the thrust from the propeller is transmitted through the shafting and associated equipment, to the hull of the ship The transmission of thrust from the propeller to the other equipment is governed by the thrust block, propeller shaft and the stern tube. In other words, the transmission of energy and the control of torque from the thrust block to the stern tube are controlled by these components only. The thrust block present just aft of the main engine and its purpose is to transmit the energy to the structure of the ship which is produced by the rotating propeller. The thrust block contains metals pads which are wedge shaped with oil groves into them. This prevents them from wearing because of the rotation of the drive shaft. There is an oil reservoir at the bottom through which the sea water is circulated. Next, the power is transmitted to the propeller shaft which is connected to the main engine flywheel through the thrust block, which is further passed along the tunnel of the shaft. The stern tube is at the end of the transmission system, it seals the propeller shaft to the aft hull. 7 Explain how sulphur dioxide comes to be a common chemical found in the composition of the exhaust gases of ocean going ships There are various exhaust gases which are emitted from the exhaust of the ship engines. However, the Sulphur dioxide is one of the common chemical compounds which are found. There are several reason because of which this happens but the most important one is the leftovers. The presence of leftover in the engine means that the combustion is not complete. Generally, the fuels used in the ships engines are gasoline which contains greater amount of Sulphur when compared with other fuels which are used. This helps in creating Sulphur dioxide at the time of combustion of fuel. In most of the cases, this Sulphur dioxide is oxidized by the catalyst and SO3 is formed which further react with water and forms Sulphuric acid, whereas in some of the case hydrogen sulphide gas may also be formed. This process given a smell of rotten egg and a black thick smoke is generated. This is the reason why we see black smoke coming out of the exhaust of the ships engine. This is one of the major concerns of the water transporters as well as the living being on this planet. It is very necessary to keep a close eye on the total emission of Sulphur dioxide. The US government has already passed the regulatory according to which the % of Sulphur dioxide shouldnt be greater than 3.6% of the total emission. This can also be controlled by desulfurization of the flue gas, which are being used in almost all the factories and plants across the globe. During this process, the flue gases are allowed to pass through a close chamber where calcium hydroxide is sprayed. The SO2 react with i t and form calcium hydroxide, calcium sulfate and calcium sulfite. 8 Explain the term hydrodynamic lubrication and give the reasons why it can fail. The term hydrodynamic lubrication is given when there is no direct contact between shaft and the bearing material. A wedge or layer of oil supports the shaft rotating within the bearing. The principle used in hydrodynamic lubrication system and because of which the film supports such high load is similar to the aquaplaning of the car on the wet road surface. The tyre of the car slides over the water accumulated between the road and the tyre. This happens because the water accumulates faster than the time required by the weight of the car to remove that water from between and the car floats on the water surface. The same principle goes with the hydrodynamic lubrication system. A wedge is created between the two surfaces because of the relative motion between them. This wedge shaped zone creates high pressure film between the surfaces. Consider the fig, when the journal is at rest, there is a direct contact between the bearing because of load W. When the journal starts moving, it will climb the bearing surfaces and after certain speed the lubricant is pulled a wedge shaped and pushes the journal to the other side. Hence, it is necessary that continuous and sufficient lubrication is provided to the system irrespective of whether supplied under pressure or not. There are various reasons because of which the failure of hydrodynamic lubrication can fail and they are as follows: The weight of the journal is much higher such that it doesnt allow the lubrication to form a wedge like structure. If the speed of the shaft is too slow, then this will not allow the lubricant to form a film between the two surfaces of the contacting material. Hydrodynamic lubrication can only take place if continuous and sufficient lubricant is provided to the system. 9 Complete a line drawing showing the 5 main components, and associated pipework, found in a Basic refrigeration system. In 300 words explain the operation of the system The five main components of the basic refrigeration cycle are as follows: Evaporator Condenser Heat Exchanger Compressor Expansion Valve Working Principle: Consider the beginning of the cycle at the evaporator. Low pressure liquid is fed into the evaporator which absorbs heat, expands and converts into low pressure gas at the exit point of evaporator. This low pressure gas is fed into the compressor from where it is then further pumped to condenser after increasing the pressure of the gas. In some of the refrigeration cycle, accumulator is also used in addition which doesnt allow any liquid droplet to pass to the compressor. It is advised to have accumulator in almost all the system subjected to load variations. Then this gas is transferred to the condenser where it is condensed (heat is removed from the gas) and becomes a high pressure liquid. Between the suction line and the liquid line the heat exchanger is placed which also is an optional one, it may or may not be present depending on the system design. After the condenser, this high pressure liquid gas is passed through the expansion value which controls the flow of the refrigerant into the evaporator. It majorly depends on the evaporator load, higher the evaporator load higher is the flow of refrigerant to the evaporator. As this high pressure liquid enters the evaporator, it is subjected to lower pressure because of the suction of the compressor. This forces the refrigerant to evaporate and for which it takes the heat from the air passing over the evaporator. And, this help in achieving the desired temperature and this cycle continues as long as desired temperature is maintained. Thermostat is also used in the refrigeration system so that it can break the electrical circuit of the compressor motor and stops it as soon as the desired temperature is achieved and starts it as the temperature increases a little bit. 10 Using a combination of drawings, compare the action of a ships propeller/rudder combination with that of a podded drive system, when a ship is turning to Port. Name all the main parts required and explain their function. Rudder which is placed on the aft of the ship is not sufficient enough to turn the ship on its own. It can be understood from the size of the rudder to that rudder being such a small part in the ship will not be able to turn the ship which is infinity times bigger than it. Consider a helmsman turning the ship towards the starboard. It gives some angle to the rudder. Because of this a rudder is force is generated which is directed towards the transverse direction of the ship. This will cause to attain a sway velocity towards the port side. However, this sway is so negligible in comparison to the turning of the ship that it is hardly felt. This only helps in creating a drift angle towards the starboard. Now, lets consider the rudder at the bow side. Now, if rudder is turned toward the starboard, the rudder force will still be in the direction of the port. This rudder direction towards the port and the net hydrodynamic moment would cause the ship to turn towards the port. The podded drive system is still finding its way into the marine industry. The mermaid system from kamewa and Azipod system from Finland have both made up to the cruise industry recently and holding on to the market. It has been known since hundreds of year that narrow channels and confined water are always a challenge to the captain in maneuvering the ship. However, the existence of Podded drive system has somehow decreased the traumatic condition of the captains. In rudder propulsion system, a complete set of propeller and controlled pitch propeller is used to maneuver a ship, whereas in this system its just a mechanism which will maneuver the ship with less effort. This newly designed mechanism doesnt only work efficiently, in addition in conserves energy and money to a greater extent.