Essay on Identity in Huckleberry Finn -- Adventures Huckleberry Huck F

The Development of Identity in Huckleberry Finn In the novel The Adventures of Huckleberry , by Mark Twain, the main character enters into a transitional period of his life. This character, Huck Finn, faces many situations in which he is forced to deal with decisions that foster with in them the ability to bring about change. Since transition is the process of entering change, Huck is searching for an identity which is truly his own. In determining his self image, Huck deals with conformity and freedom, trying on different identities that do not belong to him, and enveloping and shaping these new found attributes into an identity which best suits his "deformed conscience." The Adventures of Huckleberry Finn begins with Huck under the care of Widow Douglas. Since Huck is so used to being unencumbered, "He sees the widow Douglas' protection solely in terms of confinement"(WHIT 156). This is unacceptable to Huck because he, "loses his freedom amid 'the bars and shackles of civilization"(WHIT 156). According to Susan Harris, "the sensory world exists beyond the narrow conventions of the human community and it is the place for the regeneration of the soul"(78). To put it in simpler terms Huck belongs out under the stars where he will not be bound by the community. The next impedance in which Huck is faced with is the untimely return of his drunkard father. His father was merely stopping through to steal money from his son. So since he did not care for his son much, Pap did not feel the least bit inclined to treat his son with any respect. So Huck once again faces confinement, except this time it is in a log cabin. This time, "the only release is escape, flight and effacement of the identity through which bot... ...s own, and enveloping and forming these new found attributes in to a an identity which best suits his "deformed conscience." III Body Huck versus Conformity-Freedom * 1.Huck's stay with Widow Douglas * 2.The flight from Pap * 3.The Raft Trying on Different Identities * 1.Huck's "Death" * 2.The beginning of Huck's quest for himself * 3.Other examples of characters from the novel Deformed Conscience(Good vs. Bad) * 1.Huck's religion * 2.Huck and Jim * 3.Huck needs a family IV Conclusion Huck encounters various situations in which he learns to adapt and react to each situation in a way he feels suitable. Through these experiences Huck learns and overcomes boundaries. Huck combines his learned knowledge into an identity which suits him and thus creates a conscience with which he is comfortable.

Dbq: French and Indian War

DBQ the French and Indian War The French and Indian War is known as an unintentional war sparked by a young George Washington’s actions towards the French ambassador. Both the English and French wanted to obtain control of the Ohio Valley. Each group desired to show their superiority and gain the benefits of the new world. The English and French could not solve their disagreement peacefully, and war was inevitable. The war not only changed the new world forever, but also, Britains relationship between its American colonies.The relationship between Britain and its American colonies was transformed through the political, economic, and ideological relations, due to the French and Indian War. Britain’s political relations with its American colonies were effected as a result of the French and Indian War. America today, as we know it, would not be the same if the English had not been victorious over the French. The war determined who would gain control of the new world. The m aps in Document A show that before the war, the French controlled most of the new land, but after the war, the English had secured the new world as its territory.It is easy to see that Britains victory over the French helped Britain politically, however; it produced tension with its American colonies. Shortly after the war, England realized what the war had really cost them tons of money they did not have. Britain expected the colonies to help pay the debt from the war, but the colonists felt it was not their responsibility. This controversy contributed to the political strain between Britain and its American colonies.The French and Indian War altered Britains relationship with its American colonies drastically, as Britain imposed its political authority on the colonists. Britains relationship with its American colonies was not only altered politically due to the French and Indian War, but also through its economy. The British began placing taxes upon the colonists and essentially t elling them what they could and could not do and who they could and could not trade with. The colonists were infuriated and felt that the taxation was unjust. Document F states the reason that taxes were placed upon the colonists. TheBritish Order in Council clearly states that, â€Å"we find that the revenue arising there from is very small and inconsiderable,†¦and is not yet sufficient to defray a fourth part of the expense necessary for collecting it. † The commissioners said that all the money it took to make the war happen was not paid back through the land acquired; so, as a result, taxes were placed upon the colonists. Another document that supported this claim about financial troubles was Document H. The picture in Document H was meant to show that after the war, Britain faced extremely rough times economically. Some colonists were depressed, sorrowful, and penniless.The outcome of the French and Indian War damaged Britains economic relations with its American co lonies. The American colonies ideological relations with Britain changed after the French and Indian War. All colonists did not view Britain the same way. In documents D and E, two very distinct views of Britain were displayed. The solider in Document D writes. â€Å"Therefore we now see what it is to be under martial law and to be with [British] regulars, who are but little better than slaves to their officers. † The Massachusetts soldier in this document hated Britain and felt they were treated no better than the slaves.Although, Document E stated, â€Å"Here shall our indulgent Mother, who has protected us, be served and honored by growing Numbers, with the Duty, Love and Gratitude, till Time shall be no more. † Reverend Thomas Barnard said in his sermon that Britain protected them. He felt the colonists should love, honor, and serve Britain forever to show their appreciation. Reverend Barnard viewed Britain as a blessing from God and he loved Britain. The colonists ’ views of Britain were not all the same, while some loved and appreciated Britain, but others hated and criticized them.The French and Indian War completely changed the ideological relations between Britain and its American colonies. As can be seen, Britains relationship with its American colonies was undoubtedly altered due to the results of the French and Indian War. Britains victory over the French came at a cost, as Britain’s grasp on its American colonies began to slip away, and the results of the war changed America as it is known today. The relationship between Britain and its American colonies was altered through the political, economic, and ideological relations, as a result, of the French and Indian War.

Adolescent Sexual Behavior Essay

Introduction Adolescent sexual behavior refers to sexual feelings, behavior, and development in adolescents. It is a stage of human sexuality. The sexual behavior of adolescents is influenced by their culture’s norms and mores, their sexual orientation and the issues of social control. Sexuality is a cultural issue. For humans, sex is a matter of cultural meaning and personal choice than biological programming. Costs and Benefits of Sexual Behavior According to a 2004 study, the rates of adolescent sexual intercourse and birth rates to teenagers in the United States have declined, but a majority of adolescents have been engaging in sexual intercourse before completing high school. 42% of high school students did not use a condom during their last sexual encounter and 14% engaged in sexual activity with approximately four partners. Reducing adolescent sexual activity and the risk for sexually transmitted diseases is a priority under Healthy People 2010, a set of health objectives for the nation to achieve over the first decade of the new century. (Deptula, Shoeny, Slavick, 35) Studies show that there is a link between sexual attitudes and sexual behavior. Attitudes are related to condom use and sexual activity is for both younger and older adolescents. Not surprisingly, high school students reported that positive attitudes toward sex were related to engagement in sexual activity. It was particularly concerning sexual pleasure. Worries about pregnancy and sexually transmitted infections were related to condom use. Theories suggest that attitudes are a key part in the process of making behavioral decisions. The Health Belief Model, a psychological model that attempts to explain and predict health behaviors, is determined by focusing on the attitudes and beliefs of individual. The Decisional Balance model postulates that behavioral decisions are made by assessing and comparing relative gains or losses associated with behavioral engagement. The factors include: costs for the individual and  significant others as well as approval from oneself and significant others. In a study that examined the Costs and Benefits of condom use it was found that the ratings for perceived behavioral costs of protection remained constant over time while perceived benefits of birth control and condom use were associated with behavior change. (Deptula, Shoeny, Slavick, 35) The relation between attitudes and sexual decision-making may also be influenced by the impact of demographic factors such as age, gender, and religion, on attitudes. Boys had more positive attitudes towards sex than girls and girls had more positive views of abstinence. Males also had more liberal attitudes towards premarital casual sex and anxiety, fear and guilt concerning sexuality. They were also more likely to report greater benefits associated with sexual activities than females. Despite the gender differences in attitudes, the beliefs that each held are important predictors for both males and females. Attitudes towards sex become more positive with age and the gender differences in attitudes decreased with age. When an analyses conducted to determine is attitudes words sexual activity were majorly associated with engaging in sexual behavior, it was revealed that adolescents who had never engaged in sexual activity reported more cost associated with intercourse and fewer benefits compared to those who were sexually active. Engagement in sexual activity was linked to a perception of lower costs and greater benefits for intercourse. The primary purpose of the study was to determine which two aspects of attitudes, cost and benefits, predicted parallel and future sexual activity. The effects of costs were equivalent, if not stronger than benefits. The study also suggested that the perception of costs and benefits were both influential in adolescents’ decisions to engage in sexual activity. Based on the theory of Decisional Balance, it is expected that adolescents who decided to engage in sexual activity would report fewer costs and greater benefits associated with having sex, which is somewhat supported by the study. When the likelihood of intercourse was 50%, the awareness of costs was greater than the awareness of benefits. It appears that although  costs still outweigh benefits, adolescents still engage in sexual activity, suggesting that there are other factors that play a role in the decision to have sex. (Deptula, Shoeny, Slavick, 41) The results of the studies have important suggestions for prevention. The start of sexual activity was predicted by both costs and benefits attitudes. Perception of costs was slightly more influential than benefits in prediction later sexual initiation. It is suggested that both of those dimensions be targeted in order to successfully delay adolescent engagement in sexual activity. In studying the costs, it was revealed that its main focus was on teenage pregnancy. The benefits included social status, personal pleasure and interpersonal connection. The study also revealed that females with high cognitive abilities reports more benefits associated with sex while males with lower cognitive abilities reported fewer costs. The Way Teens Define Sex There is certainly a divide between the teenagers of today and generations before them. The divide has to do with what each generation considers to be sex. According to research done by the Centers for Disease Control and Prevention, more than half of 15- to 19-year olds are engaging in oral sex. Adults say that is a form of sex, but teenagers do not see it that way. A 19-year old sophomore in college stated, â€Å"For most teens, the only form of sex is penetration, and anything else doesn’t count. You can have oral sex and be a virgin,† while most adults consider oral sex as something that is extremely intimate. Sarah Brown, director of the National Campaign to Prevent Teen Pregnancy said, â€Å"What we’re learning here is that adolescents are redefining what is intimate.† Teenagers view oral sex as something that is quite casual so it doesn’t need to be done while in a relationship. (Jayson, 1) Psychologist David Walsh stated that the brain is wired to develop intense physical and emotional attraction during the teenage years as a part of the maturing process and he is disturbed by the way that the media portrays casual sex because it gives teenagers a false image on true intimacy. (Jayson, 2) When a parent discovers that their child in engaging in oral sex, they aren’t sure what to think because of the way that teens are so nonchalant about it and parents weren’t usually doing that as teenagers. This could also be due to the fact that many parents do not believe that their child is the one who engages in such things. The definition of abstinence is changing as well. Everyone has a different definition of sexual abstinence. The most common meaning of sexual abstinence is not having any type of sexual intercourse. Abstinence is often linked with how recently a sexual behavior has occurred. If a certain sexual activity did not occur recently, many teens would describe themselves as abstinent, regardless of their sexual history, while others still define it as not doing anything sexual. It just depends on who you are. The Media’s Influence on Sexual Behavior The mass media is becoming the easiest way for young people to learn about sexual behavior and see it as well. Perhaps it is so influential because the teenage years are when we develop our own sexual beliefs and behaviors and parents are very reluctant to talk about sexual issues. The average adolescent spends six to seven hours using media ranging from television to books. That number could be higher by now because most adolescents now have televisions, computers, DVD players and some sort of audio system in their rooms and other parts of their homes besides their living rooms. Much of the media that adolescents are exposed to include sexual imagery but rarely portray consequences of risky sexual encounters or healthy sexual messages. Many health professionals believe that mass media content showing casual sex with no consequences has resulted in a host of negative behaviors among teens who may be persuaded that teen sexual activity is something â€Å"everyone† does.(Hart, 4) Although data shows that adolescents use media very frequently, mass media influences are rarely included as important contexts for adolescents’ sexual socialization. Researchers suggest that media influences showed consistent and significant  association with early adolescent sexual intentions and behaviors. Being male was associated with greater sexual intentions and activity. No religious variable in the study was associated with sexual intentions of behaviors. Perceived sexual permission from the media was also associated with sexual intentions, light sexual activity, and heavy sexual activity. (L’Engle, Brown, Kenneavy, 191) The findings of the study also showed that adolescents who are exposed to more sexual content in their media diets are more likely to engage in sexual intercourse in the near future. The media serves as a â€Å"super peer† for adolescents who wish to seek information about sexuality because it is easily accessible. It has also been said that the information that they receive from the media is different from what they learn from other sexual socialization agents such as parents, school and religion. Media programming rarely shows negative consequences from sexual behavior and depictions of condom and contraception use are very rare, making media users more likely to act the way that they see characters acting because they are seen as realistic and they are not punished for their behavior, making these behaviors convincing to adolescents. (L’Engle, Brown, Kenneavy, 191) Trends and Estimates of Sexual Activity Before getting into the details we must distinguish between sexually experienced and sexually active. Sexually experienced is a teenager who has had sexual intercourse at least once in his/her lifetime. A sexually active teenager is one who has had sexual intercourse in the past three months. The earlier an adolescent has sex, the longer he or she is at risk of pregnancy and contracting an STI. In 2002, approximately one-quarter of never married teenagers has had sexual intercourse before the age of 16. The number increased as age did. Some adolescents who have not engaged in sexual intercourse have engaged in oral sex.(Terry-Humen, Manlove, Cottingham, 3) Since many teenagers do not consider oral sex to be sexual activity, they probably do not concern themselves with the risks of this behavior. Due to  the fact that not many teenage relationships are long term, not all sexually experienced teenagers remain sexually active or are consistently sexually active. Those who are consistently sexually active put themselves at risk for pregnancy and contracting an STI each time they have sex or have sex with a new partner. (Terry-Humen, Manlove, Cottingham, 3) Being in a relationship that teenagers view as romantic is associated with a greater likelihood of having sex. Teenagers with older sexual partners are more likely to engage in sexual intercourse than those with similar age partners. Females are more likely to be in a steady relationship when they have sex for the first time. (Terry-Humen, Manlove, Cottingham, 4) In order to continue with having declines in teen pregnancy and lower the rising rates of STIs, it is suggested that messages of abstinence be reinforced, encourage teenagers to reduce the frequency of sexual activity and partners, educate them about the risks of oral sex, and expand interventions to high-risk populations, such as minority groups. (Terry-Humen, Manlove, Cottingham, 7) Conclusion When it comes to predicting later sexual activity, both Costs and Benefits are important, although attitudes concerning the costs were a bit more influential in predicting sexual activity. It is suggested that both Costs and Benefits be included to hinder sexual activity. Due to the way that every different generation was raised, the way in which we define sex is different to everyone. Baby-boomers see oral sex as something that is very intimate while teenagers see oral sex as something that is casual. The way in which some teenagers behave can end up hurting them in the future because they will not know how to have a long-lasting, healthy relationship. Adolescents who are exposed to sexual content in the media and obtain greater support from the media that is related to sexual behavior have greater intentions to engage in sexual intercourse and other sexual activities. The most obvious ways for teenagers to avoid STIs and unintended teenage pregnancy and childbearing is by delaying sexual initiation or reducing the sexual activity and number of sexual partners as well as improving contraceptive use of those who are sexually active. My Take In my opinion, I think that it’s great that people are trying to reduce the number of teenage pregnancies and STIs in teenagers. I don’t believe that a person should have to be abstinent until marriage or anything like that and I believe that contraception should be used at all times. It is very alarming that kids are having sex at younger ages. I’m with a lot of teens that say that oral sex is not really sex and I think it is due to the time period I’m growing up in. We’re desensitized to these things. I think that it’s important for parents to talk to their kids about sex, even though we probably know more than they think. Many kids I know, as well as myself, surprise our parents with how much we know about sex already because things were different when they were younger. Everything was more hush, hush then. The media is definitely a huge influence on the way that we live our lives today because sex is everywhere and it’s what sells.

Nursing Career and its Advantages in doing Higher Education Essay

Abstract Nursing image is changing every day from ancient gown and cap to colored scrubs. People choose nursing for different reasons. I chose this profession because; I like to be a role model for the new nurses. After I graduated as a Registered Nurse (RN) in 1999 my first patient said, â€Å"If an Angel has dropped from heaven that is you nurse†. R.Mariam (personal communication, June, 1999). This sentence inspired me a lot and gave hope in my career. Job satisfaction is an essential part in any profession especially in this field since, we deal with life and death and it helps to raise patient’s safety, performance, quality of care, patient’s satisfaction and productivity of the organization. Like in any other field, this field also has some frustrations, but facing the problem and coping with frustrations is what helps us to reach the goal. This paper also explains the advantages of doing continuing education since, nursing profession is widely spreading and changing every day and it needs highly qualified knowledgeable and competent employees to serve. Keywords: Nursing profession, Career, Job satisfaction, patient’s safety, quality of care, performance, productivity, frustrations, and continuing education. Nursing Career and its Advantages in doing Higher Education Nursing is an art, science and profession by which we render care for the patients irrespective of all ages, religion, caste or gender who are acutely ill and in critical condition. Nurses around the world make the largest group of health professionals. They are the back bone of the healthcare system. Nurses are not only providing care for the patients, but they are also responsible for the emotional welfare of patients and their families too. Career as a Critical Care Nurse: When I was a kid, I always wanted to pursue a career in nursing or medical field. I have a sister who is a nurse. At the age of 19 years in India, I  decided to go for nursing degree and I graduated as a Registered Nurse in 1999. Nursing profession touched me a lot and it made my career interesting. I started my career as an Operating Room scrub nurse and circulating nurse. It was interesting everyday by not only taking care of the patients, but also managing the operating room activities, ensuring that the equipment’s are safe and sterilized, equipment’s are properly audited and consent forms were filled and signed by concerned members of the family. It is very crucial to be an operating room nurse, as the entire procedure depends on the efficiency and job knowledge. It is the responsibility of the nurse to be the mediator between the patients, families and the physicians. Being an operating room nurse I did not have much interaction with my patients. Almost all patients in operating room gets general anesthesia. As an OR nurse, I felt I am not interacting with the patients well and I am not fulfilling my job as a nurse completely. After few years, I decided to become an Intensive Care Unit (ICU) nurse. Transition from OR to ICU nurse was little hard for me initially, but I enjoy working with the patients and spending enough time with them and their families. At times, I have to be an advocate between the patients, families and doctors because we deal with critically ill patients. Reason for Motivation to continue in Nursing: According to Locke and Lantham (2002), Personal goals play an important part in direction and maintenance of behaviors which is needed to achieve rewards. People who are confident, believe in their ability to achieve goal and believe that the attainment of goal will lead to successful career are the ones able to complete their task effectively to reach their goals (Lent, Brown, & Hackett, 1994). Nursing profession is one of the widely expanding fields that call for passion according to (Raye, L. 2006). It is a good choice for people who find themselves more comfortable and satisfied in helping people who are in need to maintain and achieve normal health. Nursing offers wide variety of opportunities according to each individuals interests such as critical care unit, labor and delivery, pediatrics, geriatrics, telemetry, med-surg, oncology, infectious diseases, pain clinic, outpatient clinic etc. And also  it offers continuing education and competencies to keep the knowledge and skills up-to-date (Raye, L.2006). It offers flexible working hours such as three twelve hour shifts or four ten hour shifts (Blanche, J.2010). And due to the availability and shortage for nurses it offers incentive and bonuses for extra hours. It is a lifetime career which is flexible and rewarding. If we lose jobs in one position there are lots of available jobs in the market for talented individual s. It is also well-paying job with good benefits such as tuition reimbursement for higher education, medical benefits, life insurance and child care. Overall it is flexible. The reason why I have chosen nursing career was, a nurse who inspired me in my life and my interest towards, caring for human beings. The American Association of Colleges of Nursing (1998, 2008) and the National League for Nursing (2007) identified caring as the foundation for nursing. At the age of 15 years old, my dad had a massive heart attack and he was in Intensive care unit. He was intubated, on the ventilator, with so many drips infusing, with monitor alarming all the time. My whole family was very upset and hopeless. The nurse who took care of my dad was very dedicated , honest and very knowledgeable , she went above and beyond in helping us in that situation, keeping track of vital signs, maintaining his breathing, keeping him hemodinamically stable, giving back care, mouth care, sponge bath and giving emot ional support to the family and explaining what’s is going on with him. Few days later my dad died in the hospital but the nurse who took care of my dad stayed in my mind. Since then I always wanted to be a nurse who is caring, attentive to the emotional wellbeing of the patients and their families, providing emotional support because family place trust and self-respect in our hands. They want us to keep their loved ones comfortable, pain free and monitored all the time and not left alone. My passion for nursing grew when a patient or family member smiles at me and say â€Å"Thank you†, it enlightens me and lights up my day with more energy and spirit. Frustrations in Nursing Profession: The most important thing that frustrates me is the charting. Now most of the hospitals are computerized, but some hospitals still do paper charting and add more and more paper work every day. This means I have to spend more time doing paper charting than taking care of the patients. Sometimes we are short staffed and we have to do not only the registered nurse jobs, but we also have to be a house keeper doing accidental cleaning, secretary entering orders, patient care tech, Phlebotomist doing lab draws and also calling doctors with the patient’s lab and radiology results if we don’t see them on rounds. These are the thing which frustrates me, because it reduces the time which we spend for the patient care. Overall, Frustrations are common and it can happen in any other field but the nature of frustration may differ. Advantages due to addition Education in my Career: 1. Now most hospitals in New Jersey prefer Bachelor’s degree in nursing and there is a â€Å"global shortage for nurses, it gives us job security† (Blanche, J.2010). 2. It offers potential high income for well qualified employees. 3. More choice availability to go back to school to continue in higher education for nurse practitioners, nurse anesthetist and nurse educator. 4. It also helps us to interact with the other hospital nurses and health care professionals in classes which help me to improve patient care and make my job more enjoyable. 5. It gives knowledge and skills in critical thinking in assessment and problem solving in everyday practice. 6. It offers opportunity to be a mentor for the new nurses and to be a resource nurse. 7. By doing Bachelor’s degree in nursing, I am sure by the end of the course I will be well trained in areas such as effective communication, leadership and critical thinking which is very important in today’s nursing practi ce as well as it is necessary for administrative position, research and teaching. References American Association of Colleges of Nursing. (1998). The essentials of baccalaureate education for professional nursing practice. Washington, DC: Author. American Association of Colleges of Nursing. (2008). The essentials of baccalaureate education for professional nursing practice. Washington, DC: Author. Blanche, J. (2010). 10 reasons a nursing degree is a good best in education today. Retrieved from http://www.nurses-forum.com/blog/246/10-reasons-a-nursing-degree-is-a-good-bet-in-education-today/ Locke, E. A., & Latham, G. P. (2002).

3 D Optical Storage

3-D OPTICAL DATA STORAGE TECHNOLOGY * *ABSTRACT 3D optical data storage is the term given to any form of optical data storage in which information can be recorded and/or read with three dimensional resolution (as opposed to the two dimensional resolution afforded, for example, by CD). Current optical data storage media, such as the CD and DVD store data as a series of reflective marks on an internal surface of a disc. In order to increase storage capacity, it is possible for discs to hold two or even more of these data layers, but their number is severely limited since the addressing laser interacts with every layer that it passes through on the way to and from the addressed layer. These interactions cause noise that limits the technology to approximately 10 layers. 3D optical data storage methods circumvent this issue by using addressing methods where only the specifically addressed voxel (volumetric pixel) interacts substantially with the addressing light. This necessarily involves nonlinear data reading and writing methods, in particular non linear optics. 3D optical data storage is related to (and competes with) holographic data storage. Traditional examples of holographic storage do not address in the third dimension, and are therefore not strictly â€Å"3D†, but more recently 3D holographic storage has been realized by the use of microholograms. Layer-selection multilayer technology (where a multilayer disc has layers that can be individually activated e. g. electrically) is also closely related. This innovation has the potential to provide terabyte-level mass storage on DVD-sized disks. Data recording and readback are achieved by focusing lasers within the medium. However, because of the volumetric nature of the data structure, the laser light must travel through other data points before it reaches the point where reading or recording is desired. Therefore, some kind of nonlinearity is required to ensure that these other data points do not interfere with the addressing of the desired point. 1. Overview: Current optical data storage media, such as the CD and DVD store data as a series of reflective marks on an internal surface of a disc. In order to increase storage capacity, it is possible for discs to hold two or even more f these data layers, but their number is severely limited since the addressing laser interacts with every layer that it passes through on the way to and from the addressed layer. These interactions cause noise that limits the technology to approximately 10 layers. 3D optical data storage methods circumvent this issue by using addressing methods w here only the specifically addressed voxel (volumetric pixel) interacts substantially with the addressing light. This necessarily involves nonlinear data reading and writing methods, in particular nonlinear optics. 3D optical data storage is related to (and competes with) holographic data storage. Traditional examples of holographic storage do not address in the third dimension, and are therefore not strictly â€Å"3D†, but more recently 3D holographic storage has been realized by the use of microholograms. Layer-selection multilayer technology (where a multilayer disc has layers that can be individually activated e. g. electrically) is also closely related. Schematic representation of a cross-section through a 3D optical storage disc (yellow) along a data track (orange marks). Four data layers are seen, with the laser currently addressing the third from the top. The laser passes through the first two layers and only interacts with the third, since here the light is at a high intensity. As an example, a prototypical 3D optical data storage system may use a disk that looks much like a transparent DVD. The disc contains many layers of information, each at a different depth in the media and each consisting of a DVD-like spiral track. In order to record information on the disc a laser is brought to a focus at a particular depth in the media that corresponds to a particular information layer. When the laser is turned on it causes a photochemical change in the media. As the disc spins and the read/write head moves along a radius, the layer is written just as a DVD-R is written. The depth of the focus may then be changed and another entirely different layer of information written. The distance between layers may be 5 to 100 micrometers, allowing >100 layers of information to be stored on a single disc. In order to read the data back (in this example), a similar procedure is used except this time instead of causing a photochemical change in the media the laser causes fluorescence. This is achieved e. g. by using a lower laser power or a different laser wavelength. The intensity or wavelength of the fluorescence is different depending on whether the media has been written at that point, and so by measuring the emitted light the data is read. It should be noted that the size of individual chromophore molecules or photoactive color centers is much smaller than the size of the laser focus (which is determined by the diffraction limit). The light therefore addresses a large number (possibly even 109) of molecules at any one time, so the medium acts as a homogeneous mass rather than a matrix structured by the positions of chromophores. 2. History: The origins of the field date back to the 1950s, when Yehuda Hirshberg developed the photochromic spiropyrans and suggested their use in data storage. [3] In the 1970s, Valeri Barachevskii demonstrated that this photochromism could be produced by two-photon excitation, and finally at the end of the 1980s Peter T. Rentzepis showed that this could lead to three-dimensional data storage. [5] This proof-of-concept system stimulated a great deal of research and development, and in the following decades many academic and commercial groups have worked on 3D optical data storage products and technologies. Most of the developed systems are based to some extent on the original ideas of Rentzepis. A wide range of physical phenomena for data reading and recording have been investigated, large numbers of chemical systems for the medium have been developed and evaluated, and extensive work has been carried out in solving the problems associated with the optical systems required for the reading and recording of data. Currently, several groups remain working on solutions with various levels of development and interest in commercialization. *3. Processes for creating written data*: Data recording in a 3D optical storage medium requires that a change take place in the medium upon excitation. This change is generally a photochemical reaction of some sort, although other possibilities exist. Chemical reactions that have been investigated include photoisomerizations, photodecompositions and photobleaching, and polymerization initiation. Most investigated have been photochromic compounds, which include azobenzenes, spiropyrans, stilbenes, fulgides and diarylethenes. If the photochemical change is reversible, then rewritable data storage may be achieved, at least n principle. Also, multilevel recording, where data is written in ‘grayscale’ rather than as ‘on’ and ‘off’ signals, is technically feasible. 3. 1 Writing by non*-*resonant multiphoton absorption Although there are many nonlinear optical phenomena, only multiphoton absorption is capable of injecting into the media the significant energy required to electronically excite molecular species and cause chemical reactions. Two-photon absorption is the strongest multiphoton absorbance by far, but still it is a very weak phenomenon, leading to low media sensitivity. Therefore, much research has been directed at providing chromophores with high two-photon absorption cross-sections. Two photon absorption (TPA) is the simultaneous absorption of two photons of identical or different frequencies in order to excite a molecule from one state (usually the ground state) to a higher energy electronic state. The energy difference between the involved lower and upper states of the molecule is equal to the sum of the energies of the two photons. Two-photon absorption is a second-order processes several orders of magnitude weaker than linear absorption. It differs from linear absorption in that the strength of absorption depends on the square of the light intensity, thus it is a nonlinear optical process Writing by 2-photon absorption can be achieved by focusing the writing laser on the point where the photochemical writing process is required. The wavelength of the writing laser is chosen such that it is not linearly absorbed by the medium, and therefore it does not interact with the medium except at the focal point. At the focal point 2-photon absorption becomes significant, because it is a nonlinear process dependent on the square of the laser fluence. Writing by 2-photon absorption can also be achieved by the action of two lasers in coincidence. This method is typically used to achieve the parallel writing of information at once. One laser passes through the media, defining a line or plane. The second laser is then directed at the points on that line or plane that writing is desired. The coincidence of the lasers at these points excited 2-photon absorption, leading to writing photochemistry. 3. 2 Writing by sequential multiphoton absorption Another approach to improving media sensitivity has been to employ resonant wo-photon absorption (also known as â€Å"1+1† or â€Å"sequential† 2-photon absorbance). Nonresonant two-photon absorption (as is generally used) is weak since in order for excitation to take place, the two exciting photons must arrive at the chromophore at almost exactly the same time. This is because the chromophore is unable to interact with a single photon alone. However, if the chromophore has an ene rgy level corresponding to the (weak) absorption of one photon then this may be used as a stepping stone, allowing more freedom in the arrival time of photons and therefore a much higher sensitivity. However, this approach results in a loss of nonlinearity compared to nonresonant 2-photon absorbance (since each 1-photon absorption step is essentially linear), and therefore risks compromising the 3D resolution of the system. 3. 3 Microholography In microholography, focused beams of light are used to record submicrometre-sized holograms in a photorefractive material, usually by the use of collinear beams. The writing process may use the same kinds of media that are used in other types of holographic data storage, and may use 2-photon processes to form the holograms. . 4 Data recording during manufacturing Data may also be created in the manufacturing of the media, as is the case with most optical disc formats for commercial data distribution. In this case, the user cannot write to the disc – it is a ROM format. Data may be written by a nonlinear optical method, but in this case the use of very high power lasers is acceptable so media sensitivity becomes less of an issue. The fabrication of discs containing data molded or printed into their 3D structure has also been demonstrated. For example, a disc containing data in 3D may be constructed by sandwiching together a large number of wafer-thin discs, each of which is molded or printed with a single layer of information. The resulting ROM disc can then be read using a 3D reading method. 3. 5 Other approaches to writing Other techniques for writing data in three-dimensions have also been examined, including: Persistent *spectral** **hole burning* (PSHB), which also allows the possibility of spectral multiplexing to increase data density. However, PSHB media currently requires extremely low temperatures to be maintained in order to avoid data loss. Void* formation, where microscopic bubbles are introduced into a media by high intensity laser irradiation. [7] Chromophore poling, where the laser-induced reorientation of chromophores in the media structure leads to readable changes. *4. Processes for reading data*: The reading of data from 3D optical memories has been carried out in many different ways. While some of these rely on the nonlinearity of the light-matter interaction to obtain 3D resolution, others use methods that spatially filter the media's linear response. Reading methods include: Two photon absorption (resulting in either absorption or fluorescence). This method is essentially two-photon-microscopy. Linear excitation of fluorescence with confocal detection. This method is essentially confocal laser scanning microscopy. It offers excitation with much lower laser powers than does two-photon absorbance, but has some potential problems because the addressing light interacts with many other data points in addition to the one being addressed. Measurement of small differences in the refractive index between the two data states. This method usually employs a phase contrast microscope or confocal reflection microscope. No absorption of light is necessary, so there is no risk of damaging data while reading, but the required refractive index mismatch in the disc may limit the thickness (i. e. number of data layers) that the media can reach due to the accumulated random wavefront errors that destroy the focused spot quality. Second harmonic generation has been demonstrated as a method to read data written into a poled polymer matrix. Optical coherence tomography has also been demonstrated as a parallel reading method. *5. Media *design: The active part of 3D optical storage media is usually an organic polymer either doped or grafted with the photochemically active species. Alternatively, crystalline and sol-gel materials have been used. 5. 1 Media form factor Media for 3D optical data storage have been suggested in several form factors: Disc. A disc media offers a progression from CD/DVD, and allows reading and writing to be carried out by the familiar spinning disc method. Card. A credit card form factor media is attractive from the point of view of portability and convenience, but would be of a lower capacity than a disc. Crystal, Cube or Sphere. Several science fiction writers have suggested small solids that store massive amounts of information, and at least in principle this could be achieved with 3D optical data storage. 5. 2 Media manufacturing The simplest method of manufacturing – the molding of a disk in one piece – is a possibility for some systems. A more complex method of media manufacturing is for the media to be constructed layer by layer. This is required if the data is to be physically created during manufacture. However, layer-by-layer construction need not mean the sandwiching of many layers together. Another alternative is to create the medium in a form analogous to a roll of adhesive tape. *6. Drive design*: A drive designed to read and write to 3D optical data storage media may have a lot in common with CD/DVD drives, particularly if the form factor and data structure of the media is similar to that of CD or DVD. However, there are a number of notable differences that must be taken into account when designing such a drive, including: Laser. Particularly when 2-photon absorption is utilized, high-powered lasers may be required that can be bulky, difficult to cool, and pose safety concerns. Existing optical drives utilize continuous wave diode lasers operating at 780 nm, 658 nm, or 405 nm. 3D optical storage drives may require solid-state lasers or pulsed lasers, and several examples use wavelengths easily available by these technologies, such as 532 nm (green). These larger lasers can be difficult to integrate into the read/write head of the optical drive. Variable spherical aberration correction. Because the system must address different depths in the medium, and at different depths the spherical aberration induced in the wavefront is different, a method is required to dynamically account for these differences. Many possible methods exist that include optical elements that swap in and out of the optical path, moving elements, adaptive optics, and immersion lenses. Optical system. In many examples of 3D optical data storage systems, several wavelengths (colors) of light are used (e. g. eading laser, writing laser, signal; sometimes even two lasers are required just for writing). Therefore, as well as coping with the high laser power and variable spherical aberration, the optical system must combine and separate these different colors of light as required. Detection. In DVD drives, the signal produced from the disc is a reflection of the addressing laser beam, and is therefore very intense. For 3D optical storage however, the signal mus t be generated within the tiny volume that is addressed, and therefore it is much weaker than the laser light. In addition, fluorescence is radiated in all directions from the addressed point, so special light collection optics must be used to maximize the signal. Data tracking. Once they are identified along the z-axis, individual layers of DVD-like data may be accessed and tracked in similar ways to DVD discs. The possibility of using parallel or page-based addressing has also been demonstrated. This allows much faster data transfer rates, but requires the additional complexity of spatial light modulators, signal imaging, more powerful lasers, and more complex data handling. *7. Development issues*: Despite the highly attractive nature of 3D optical data storage, the development of commercial products has taken a significant length of time. This results from limited financial backing in the field, as well as technical issues, including: Destructive reading. Since both the reading and the writing of data are carried out with laser beams, there is a potential for the reading process to cause a small amount of writing. In this case, the repeated reading of data may eventually serve to erase it (this also happens in phase change materials used in some DVDs). This issue has been addressed by many approaches, such as the use of different absorption bands for each process (reading and writing), or the use of a reading method that does not involve the absorption of energy. Thermodynamic stability. Many chemical reactions that appear not to take place in fact happen very slowly. In addition, many reactions that appear to have happened can slowly reverse themselves. Since most 3D media are based on chemical reactions, there is therefore a risk that either the unwritten points will slowly become written or that the written points will slowly revert to being unwritten. This issue is particularly serious for the spiropyrans, but extensive research was conducted to find more stable chromophores for 3D memories. Media sensitivity. 2-photon absorption is a weak phenomenon, and therefore high power lasers are usually required to produce it. Researchers typically use Ti-sapphire lasers or Nd:YAG lasers to achieve excitation, but these instruments are not suitable for use in consumer products. *8. Academic development*: Much of the development of 3D optical data storage has been carried out in universities. The groups that have provided valuable input include: Peter T. Rentzepis was the originator of this field, and has recently developed materials free from destructive readout. *Watt W. Webb* co developed the two-photon microscope in Bell Labs, and showed 3D recording on photorefractive media. Masahiro Irie developed the diarylethene family of photochromic materials. [13] Yoshimasa Kawata, *Satoshi Kawata* and Zouheir Sekkat have developed and worked on several optical data manipulation systems, in particular involving poled polymer systems. 14] Kevin C Belfield is developing photochemical systems for 3D optical data storage by the use of resonance energy transfer between molecules, and also develops high 2-photon cross-section materials. Seth Marder performed much of the early work developing logical approaches to the molecular design of high 2-photon cross-section chromophores. Tom Milster has made many contributions to the theory of 3D optical data storage. Robert McLeod has examine d the use of microholograms for 3D optical data storage. Min Gu has examined confocal readout and methods for its enhancement. 9 Commercial development*: In addition to the academic research, several companies have been set up to commercialize 3D optical data storage and some large corporations have also shown an interest in the technology. However, it is not yet clear whether the technology will ever come to market in the presence of competition from other quarters such as hard drives, flash storage, holographic storage and internet-based storage. Examples of 3D optical data storage media. Top row – Written Call/Recall media; Mempile media. Middle row – FMD; D-Data DMD and drive. Bottom row – Landauer media; Microholas media in action. Call/Recall was founded in 1987 on the basis of Peter Rentzepis' research. Using 2-photon recording (at 25 Mbit/s with 6. 5 ps, 7 nJ, 532 nm pulses), 1-photon readout (with 635 nm), and a high NA (1. 0) immersion lens, they have stored 1 TB as 200 layers in a 1. 2 mm thick disk. [23] They aim to improve capacity to >5 TB and data rates to up to 250 Mbit/s within a year, by developing new materials as well as high-powered pulsed blue laser diodes. Mempile are developing a commercial system with the name TeraDisc. In March 2007, they demonstrated the recording and readback of 100 layers of information on a 0. mm thick disc, as well as low crosstalk, high sensitivity, and thermodynamic stability. [25] They intend to release a red-laser 0. 6-1. 0 TB consumer product in 2010, and have a roadmap to a 5 TB blue-laser product. [26] *Constellation 3D* developed the Fluorescent Multilayer Disc at the end of the 1990s, which was a ROM disk, manufactured layer by layer. The company failed in 200 2, but the intellectual property (IP) was acquired by D-Data Inc. who are attempting to introduce it as the Digital Multilayer Disk (DMD). Storex Technologies has been set up to develop 3D media based on fluorescent photosensitive glasses and glass-ceramic materials. The technology derives from the patents of the Romanian scientist Eugen Pavel, who is also the founder and CEO of the company. First results, 40 nm marks recorded into 3D virtual layers separated by 700 nm, were presented in October 2009 at the ISOM2009 conference. Landauer inc. are developing a media based on resonant 2-photon absorption in a sapphire single crystal substrate. In May 2007, they showed the recording of 20 layers of data using 2 nJ of laser energy (405 nm) for each mark. The reading rate is limited to 10 Mbit/s because of the fluorescence lifetime. Colossal Storage aim to develop a 3D holographic optical storage technology based on photon induced electric field poling using a far UV laser to obtain large improvements over current data capacity and transfer rates, but as yet they have not presented any experimental research or feasibility study. Microholas operates out of the University of Berlin, under the leadership of Prof Susanna Orlic, and has achieved the recording of up to 75 layers of microholographic data, separated by 4. micrometres, and suggesting a data density of 10 GB per layer. [33] 3DCD Technology Pty. Ltd. is a university spin-off set up to develop 3D optical storage technology based on materials identified by Daniel Day and Min Gu. Several large technology companies such as Fuji, Ricoh and Matsushita have applied for patents on 2-photon-responsive materials for applications including 3D optical data storage, however they have not giv en any indication that they are developing full data storage solutions.

A Situation Analysis of a primary school of UK Essay

A Situation Analysis of a primary school of UK - Essay Example The ecological notion of ‘limiting factors’ is a useful concept with much relevance to the interaction of factors so as to facilitate or discourage good-quality learning. A situation analysis carried and represented here deals with the identification of learning difficulties in a primary school in UK which involves consideration of how factors like the curriculum, teaching strategies and school routines and relationships all of which affect children in different ways over a period of time. The aim would be to understand and respond to the educationally relevant individual differences which can create persistent obstacles to children’s learning in different contexts. A key aspect of this process is to give due weight to the interpretation and intentions of the people involved i.e. how does the professional interacts in the class. The tool which was used to derive efficient results was SWOT analysis. It was devised to identify the extent to which the current strateg y of an organization and its more specific strengths and weaknesses are relevant to and capable of dealing with changes in the wider environment. SWOT is an acronym for Strengths, Weaknesses, Opportunities and Threats. The professional should identify the Opportunities and Threats provided by an external environment and Strengths and Weaknesses of the school as an institution.

Responsibilities of a Team in Managing Resources Assignment

Responsibilities of a Team in Managing Resources - Assignment Example It is evidently clear from the discussion that the organization has to make use of its resources to achieve its objectives. Therefore, the team has to ensure that the group members aim at attaining the set standards by making proper use of the resources to avoid wastage. The team acts as the organization’s ambassadors. The team together with the stakeholders and the board develop strategies for future operations and give recommendations on the appropriate course of actions in the management of resources. More often, management of resources depends on the recommendations of the team-leaders and leadership of the organization. The team plays a critical role ensuring that it gives relevant information on the management of resources. It also keeps an eye on the progress of the organization in its operation. It acts as a watchdog on how the organization operates and making use of its resources. Constant monitoring of the organization ensures those resources are used appropriately a nd wastage is reduced significantly. Lastly, the team has a duty of advising the management team on the proper use of resources. There is no doubt that most managers cannot manage the organization effectively without the help of other staff and groups. These are the information sources on how the organization can be managed. The team, advice on particular areas the organization can do to manage its resources effectively. Resource plan is a document that explains the aim and purpose of the team, how it operates as well as the expected outcomes. They are simply the ‘roadmaps’ that ensures that the organization achieves its goals. Most importantly, this plan ensures that the organization uses its resources as intended thus achieving its objectives. Although the organization may face challenges, it provides a guideline on how to make use of the available resources and attain its success.