Exploring How State of Matter Affects the Rate of Diffusion Essay Example for Free

Exploring How State of Matter Affects the Rate of Diffusion Essay Introduction Diffusion is the random process by which particles distribute themselves within a container or medium. There are two factors that distinguish how substances move passively through membranes. The first factor is hydrophobic , a nonpolar molecule that can dissolve in a lipid bilayer and freely move through the membrane. However a hydrophillic molecule consisting of ions and polar molecules inhibit in their movement through the membrane making it a slower diffusion process. Selectively permeable, moreover, are charged atoms and molecules that are mostly blocked from traveling through the membrane due to the hydrophobic center. The purpose of this experiment was to test how the state of matter affects the rate of diffusion in a semi-solid vs. a liquid state. If the Potassium Permanganate crystals are placed in Petri dishes filled with water and 2% agar, then the crystals will diffuse at a faster rate in water than in the agar. The addition of the Potassium Permanganate crystals to the water and agar, there will be a result of more diffusion and more obvious color change in water compared to agar which will result in a slower less obvious diffusion. Materials The materials needed for this experiment are: One Petri dish with 2% agar and one Petri dish of water filled half way up to test the rate of diffusion. Also, two small crystals of potassium permanganate and one pair of forceps will be needed to place in the Petri dishes. One metric ruler will be need as well to measure the change of color in diameter and one 8 x 11 piece of white paper will also be used for safety precautions. Methods First, a member of the group will gather all the materials including the Petri dishes filled with tap water and 2% agar, forceps, ruler, 8X11 piece of white paper and the jar that contains the potassium permanganate crystals, and bring the materials back to the designated area. Then the experimenter will start to conduct the experiment. Then the experiment will consist of placing the empty Petri dish and the agar Petri dish on top of the white paper side by side. Second, Tap water will be added to a half way point in the empty Petri dish until it is approximately the same level as agar in the other Petri dish. Before continuing, wait for the water to stop moving to get an accurate measure of the diffusion. After that, have lab partner assist with placing potassium permanganate crystals into the agar Petri dish, while at the same time, the primary experimenter places the other two potassium permanganate crystals into the tap water. Be sure not to splash water in the aqueous dish. The moment that each crystal has been lowered is Time Zero. A purple color will be obvious immediately. Next have the experiment observe the diffusion rate for every 3 minutes for the next 15 minutes. For every 3 minutes, measure the diameter of the diffusion circle in millimeters (mm) and write down the measurement on the chart given. Be careful not to disturb the aqueous Petri dish. Discussion The results show that there a major difference in the rate of diffusion between 2% agar and tap water. Immediately, when the potassium permanganate crystals were dropped at 0, there was already an instant diffusion of 2 mm, compared to agar which was 1mm. Because water is a polar molecule, diffusion across membranes travel quicker compared to a nonpolar substance like agar that diffuse though the lipid part of a membrane. At the first 3 minute mark, it shows that the crystals have diffused relatively fast at 15 mm, compared to the diameter in agar which has slowly diffused to 5 mm. for the next 12 minutes, results have show that the diameter in water has increase about 8 10 mm every 3 minutes and agar has stayed the same throughout. Due to passive transport, the movement of molecules from the potassium permanganate have a higher concentration, and are then added to water which diffuses from that high concentration to a lower concentration. This was the expected result. Since water is polar, the crystals can easily diffuse through the gradient. Furthermore, with agar being a nonpolar molecule, it maintained a state of dynamic equilibrium because it diffused slower but was diffused evenly. However since other factors do play a role in the rate of diffusion, maybe temperature could have changed the rate of diffusion for the two Petri dishes. Also had the allotted time been different there may have also been a change in the results. There were no negative results or errors made during this experiment. Based on the results it can be concluded that dropping potassium permanganate crystals into water, diffuses across the gradient faster compared to 2% agar. This does support the initial hypothesis and the predictions were accurate.

Causes and consequences of childhood poverty

Causes and consequences of childhood poverty Anyone doing background research into the causes of child poverty will soon learn that parental income is only one of a large network of interrelated factors. To name a few; political, communal, environmental, and societal influences all play a role. As an example consider that; with the ever progressive move from a widespread agricultural, to a more localised industrial society, the number of jobs in many areas has decreased severely. And so the average number of non-educated workmen (or women) has subsequently decreased also. More and more Britains are joining the ranks of the poor each day (roughly 2,000). And with parents out of work and not earning, children will suffer as a result. Every day 1 in every 4 children is born into poverty. (Joseph Rowntree Foundation, 1995) This can lead to a number of consequences in children, which follows with them throughout adolescence and into adulthood. For example, children who grow up in families with a low income are more likely to experience mental health problems, and more likely to develop unhealthily. Greg Duncan found associations between poverty and poor health, cognitive development, behaviour, emotional well being and academic achievement. He also found that pregnant mothers who have insufficient resources such as food and warmth are 1.7 times more likely to give birth to a low weight baby, that child is then 2 times more likely to drop out of school, and 3.1 times more likely have an out of wed-lock birth (Duncan 1997). Although short term poverty can be overcome and the effects are reversible, long term poverty can be destructive on a childs life. Duncan found that children who had experienced 4-5 years of their early years of life in poverty, achieved a full 9 year decline on intelligence test scores compared to children from healthy backgrounds (Duncan 1997). The standards of living associated with children from poor families can have a negative effect on their health. For example, they are more vulnerable to asthma due to poor ventilation, as well as pneumonia due to poor insulation. Interestingly, they are also more vulnerable to developing obesity since a high carbohydrate, processed diet is the cheaper option. Those children are often excluded from participating in social activities, through both financial disadvantages as well as feeling the pressure of social stigma which can develop from having to dress inappropriately, or through receiving charity food, books, furniture and other necessities. It leads to a loss of self esteem, can be de-motivating, leads to less elevation after the simplest of pleasures, and poor ability to cope with stressful situations. Not only are they more likely to develop psychological problems as a result, these effects last longer than in those who are well off. And this leads to a vicious cycle of depression, leading to increased likelihood of a stressful event, leading to further depression. In Novaks (1995) view, this can lead to long term, irreversible changes in personality, such as; self defeatist attitudes, hopelessness, helplessness, low motivation, low drive, bitterness, aggressiveness and anti social personality disorder. Children with the latter are seen to be impulsive, have high sensation seeking, but without sense of morals or justice. It is often associated with young offenders, school drop outs, and those serving long term sentences. For these reasons, it is necessary for social workers; to get into family homes, assess their state of living, their needs, risk factors, problems, difficulties and anything else that is helpful for them to make an accurate evaluation, and to give them a better understanding. Late interventions can be damaging, for the longer things are kept untreated the harder they are to change. It is important that children are given opportunities in life to maximise their potential and make a contribution to society. Without the proper gui dance and support, they are likely to sink further and further. So it is clear that help is required. There has long been argument that to tackle poverty, social work (SW) would do best to position itself in and against the state. Workers are known to follow law, policy, the rules and regulations of agencies etc, whilst at the same time assuming a flexible role in relation to the safeguarding and supporting of individuals and families. (Bailey and Brake, 1975; Corrigan and Leonard, 1978; Bolger et al., 1981; Becker and MacPherson, 1988; Adams et al., 1998) Childhood poverty holds great relevance for social workers for it defines their very existence. If the role of social workers is to promote well being in the community, and to help young individuals achieve their potential and to function in society, then those in poverty will be the people who need help most. The Poverty and Social Exclusion Survey (PSE Survey, Joseph Rowntree Foundation 1999), which collected a number of individuals portraying an average society, found that 28% of the population were in poverty. Each of them were presented with 52 cards, each revealing an object or activity, such as central heating, a computer, going to the cinema. They were instructed to form two piles; one for items they believed were vital for living, the other for those which were not. For all those items where the majority voted them to be vital, researchers concluded that every person should have at least these in their lives. Social workers may use this as a base line when assessing families, and when children lack any (or all) of these so called necessities (i.e. are in poverty) then help should be provided; for without it, children will likely grow up depressed, suicidal or conversely, aggressive and violent. Children are vulnerable to feelings of hopelessness due to this lack of necessities.A build up of long term worries accompanying a loss of control combined with a sense of dependence, is likely to lead to distress. Chronic anxiety and even depression is not uncommon, which can be exacerbated by an oppressive society. Children from poorer backgrounds are well recognised as they are the ones who do not go on school trips, may dress differently to the rest, not have the correct equipment in lessons, have a more definable smell (not a pleasant one) etc. For those who spend time with such children it is likely they will be excluded from social groups as a result; for they become associated with the outsider and so they themselves are now too an outsider. Society recognises and treats differently any person (adults too) who stands out for whatever reason good or bad. Of course they are no different from the next person; however it is because others see them as different that they are made to feel paranoid. Paranoid that wherever they are people are staring at them, talking about them, thinking all sorts of thoughts. It is enough to cause any child, adult, man or woman huge distress and can affect their ability to be trusting around complete strangers. Constantly obsessing over ones situation will inevitably drain a child of their strength and make them feel weak, which subsequently will increase the level of stress felt. Here can be seen a vicious cycle, one which is hard to recover from without the appropriate help. Furthermore, it is often the case that parents are made to feel just as bad, if not worse. The negativity that radiates off of a child is bound to have implications, especially when he/she cannot have things that all their friends can. Parents have failed as providers and this can lead to a loss of motivation and of despair. So, childhood poverty causes a knock on effect for the rest of the family, and therefore makes it more probable they will seek social services aid. For example, schoolyard bullying can decrease a childs self esteem and affect their ability to form secure, long term relationships. This can lead to turmoil between parents and children, for parents will feel they have lost family connections. As a result, they become depressed and will seek guidance in parenting techniques. Another example would be a child whose parent cannot afford to buy them nice things such as clothes, toys or school equipment. Daily exposure to those who do have such possessions is likely to cause the child jealousy and envy; both at those children who take luxuries for granted, and also at their parents for not being able to provide. Because of the psychological issues that this can lead to, it is likely the child grows up with a desire to steal, spawned from a lifetime of unfulfilment. If they however, grow up with certain morals and choose not to steal, it is still possible that they resort to drugs/and or alcohol as a means of coping. Coping with the consuming hatred and loathe of society that has become them. Families in poverty are less able to provide for themselves, and so there is large chance that children will have to be taken away into care. Thus, a great deal of social workers time is spent within and around those in poverty (Joseph Rowntree Foundation, 1995; Becker 1997; Smale et. al. 2000; Social Exclusion Unit, 2004). Childhood poverty can lead to severe ramifications, both physical and mental, some of which people recover from in time while others can be long lasting. It is considered the universal belief poverty is as much a cause as well as an effect of mental health problems (Langner Michael, 1963). Evidence for this comes from impoverished families from lower class areas. Not only are these areas receiving low government funding they also have little support from neighbouring councils; research shows that these areas have the largest number of children with mental health problems (Department of Health, 1999b). It is clear that the linearity between poverty and wellbeing is long winded. Two possible theories however have met support, both social causation (breeder) (SC) and social selection (drift) (SS). SS describes how the accumulation of adolescents suffering mental issues, who live in poor areas, is the result of a continuous drifting towards the lower spectrum of education and while losing contact with social networks. In contrast, SC describes how a neglected socio-economic climate can have negative consequences on childhood well being to start with. From this it is to be concluded that: poor children have lifelong experience living in high risk areas, risk defined as: high chance of unemployment, growing up to rely on benefits, of teenage pregnancies, families separated, crime, street violence, rape, vandalism, malnutrition, obesity etc. Those at high risk are more likely to experience mental problems because their minds are already overburdened with every day worry. Furthermore, those at high risk are less likely to be treated for their illness because the local medical facilities are of low quality, have fewer staff and are constantly over worked. Child poverty therefore starts within neglected communities and leads to a number of psychological issues. A further difficulty is that the increase in mentally disturbed individuals can further exacerbate the ability to cope in others. That is, exposure to stressors causes stress, therefore numbers are constantly rising. There is large evidence for a correlation between low income and lack of support, and increased probability of contracting mood disorder. According to SC, the most contributory factor is the mental strain which results from all those issues associated with poverty so far mentioned, for example misfortune or wretchedness, death or separation within the family. While SS explains those born with a predisposition towards developing mood disorders will drift to such low stances, and be unable to crawl back upwards (Jarvis, 1971). Researchers found that when children were taken from their homes and placed into the care of middle class families then the number of those children who subsequently developed mood, or any other form of mental disorder subsequently reduced. This proves that economic status (ES) is an important factor, however it is likely to be the case ES leads to numerous other contributing factors rather than being sole contributor (Bruce Hoff, 1994). Factors include; access to a good education, support from extended family members, healthy living and nourishment, praise and encouragement from parents, etc. I spoke of psychological issues that rise from deprivation. It is a sad fact that children in poverty are often the topic of conversation among others. They are ridiculed, gossiped about, and excluded from social gatherings and out of school activities. It is as if the impoverished are viewed as if they have the plague. Common descriptions, taken from national surveys include words such as lazy, worthless, inferior, and undeserving. This misconception of the poor being the cause for their own predicament, not only removes any possible blame from neglected political responsibilities (which contribute largely), but also creates what psychologists termed a self fulfilling prophecy. This theory is based on the belief that beliefs shape and influence actions. By this one means; those who are seen as inferior are likely to be treated as inferior. So much so that they actually become inferior because of the lack of social support available. Children are particularly vulnerable to the influe nce of their social networks, because they are still developing and creating identities for themselves. The idea of a looking glass self is of relevance here also (Cooley 1902), which theorises that childrens self concepts are based on what others portray. There is high chance that their actual and their perceived self identity become misconstrued, if and when evidence from external sources supports the latter. They familiarise with the concept that they are weak individuals, and the negative emotions that accompany this such as self doubt, or guilt. It is important to recognise the relevance here for social workers, because this part of society categorised as lower class citizens will benefit the most from services such as child support, child therapy, connexions, EMA, every child matters and so on. And so in response to all this, SW agencies have implemented numerous partnership schemes; the women, infant and children (WIC) nutrition programme for example, which is designed to get pregnant women and children under 5 eating more healthily, Head Start provides low cost day care to children from families earning less than the 60% threshold of the average family, and many areas now even have schemes to provide low cost/free health insurance for children of all ages. It is up to the SW to assess families/individuals and to determine their eligibility for government aid. For those who are suffering from mental health as a result of poverty, SWs are able to put them in touch with professionals who can help and advise. For those who have very few or none of the necessities from the PSE Survey SWs can organise for clubs where the children can go meet peers and to join in social activities. For parents who have racked up a series of debt SWs are able to help them devise a set of preliminary steps in a certain time period resulting in a more secure financial situation (See Task Centred Practice). Clients often give off negative reviews of SW because it has failed to be of any use with real concerns; state of housing, living, etc. But task centred practice can actually be therapeutic, because it is the client who becomes the changing agent, deciding which problems they want to tackle and in what order. By using this, service providers are employing a learning experience. One which relies on both self growth and skills development, whilst addressing the more important issues. But what issues should the SW investigate first? It would be a logical idea to get right back to the start and look at what caused the families decline into poverty. Here lies a problem however, for there are different theories on what the main area of focus should be; some theories blame the individual while others focus on the failings of society. Because of this conflict in ideas it can prove difficult for SWs to accurately make assessments, or come to an agreement with each other when conducting a review. Below are a number of theories on the causes of poverty, to give an idea of these so mentioned conflicts. Firstly, explanations can be fit into three main areas; functionalist, individualistic, and Structural (Marxist). So to start, functionalists focus on the idea that any form of poverty, be it adult, child or both, proves necessary, for without it society would not govern properly. Naturally such a statement has spawned a great deal of controversy; however the theory is conceivable because it is based on logistics. Society is viewed on a grander scale than simply the here and now. And so by applying somewhat of a utilitarianistic approach, rather than considering individuals, it looks at the whole picture. Philosophers such as Herbert Gans (1971) have made contributions to this, suggesting that poverty benefits the non poor and also the rich and powerful, who therefore have a vested interest in maintaining poverty. He further suggested 5 reasons why he believed poverty is acceptable. There will always be a need for individuals to fit the jobs seen as dirty, demeaning, and without prospects. Those in poverty would rather do these than starve. Those born into poverty will grow up to replace their parents and so the cycle continues. Industries require minimum wage (or lower) work staff in order to maintain profit margins. Those in poverty are generally of low/no qualification status and so are not liable to receive higher pay. Those born into poverty generally receive poorer education than most and so are just as unlikely to receive desirable qualifications as did their parents. Without poverty, there would be a loss of jobs for those individuals who strive to combat poverty, such as social workers. A large proportion of social work revolves around work with children, so if all child poverty was resolved then many social workers would find it is they who are in need of support. Furthermore, it would also reduce the profits of wholesalers who rely on the desperation of those in poverty. Children often find there is little in the form of food at home, and so any money they have goes towards buying whatever is cheapest from stores. Poverty provides a measure of comparison for those of low opinion of their situation, and works to reassure them that there will always be people worse off than they themselves. This is true for all age groups. The media uses those in poverty as scapegoats whenever anything goes wrong in society, such as incidents of crime, rape or violence. With no one to speak out for them, the blame resides. Children are seen as vandals, and so by putting the blame on them the media is protecting societies own mistakes. Gans makes it clear that he does support poverty; he states that Phenomena like poverty can be eliminated only when they become dysfunctional for the affluent or powerful, or when the powerless can obtain enough power to change society. From looking at this, one may conclude that the reason for child poverty is because people are allowing it to happen in the first place. An increasing number of adult workers are being rid of the opportunity to earn a stable income, and so their families will suffer as a consequence. Although this not explain what the actual cause is, it does give us an understanding of why child poverty has become such a widespread issue, and why not more has been done to prevent it. Individualists are of the opinion that people are responsible for their circumstances, and have devised several theories of their own. Firstly is the idea of culture, which draws from the research of Oscar Lewis (1966) on Puerto Rican and Mexican families. He acknowledged that children are brought up to appreciate certain values, which they identify with themselves and in time teach their own offspring thus continuing the cycle. And so for those families in poverty, who have low self esteem, motivation, a sense of helplessness etc, they will pass on their negative attitudes through each generation. They will also pass on (through learning and modelling) their negative behaviours, such as drinking, violence, staying at home and not finding work, adultery, divorce, etc. And so this creates a culture of poverty, the fundamental cause being family (specifically parental) influences on their children. Lewis has been challenged because he does not offer a suggestion as to what causes poverty to begin with. Furthermore, it was suggested that children in poverty are no different in terms of beliefs, values, or personalities than those from middle or upper class families. The differences there are, are between income, opportunities for skills, learning and development. And so the alternative suggestion is that the so called culture of poverty is a result of responses of living that parents bring to their children. Secondly is the idea of a cycle of deprivation, which is based on the works of Sir Keith Joseph (1970). He suggested that the causes of poverty stem beyond social status, and move into the domain of family problems. By this Sir Keith was referring to, for example cognitive skills, social skills, personality, health and development, etc. Now consider human relationships, what attracts people? More often than not we search for those who hold similarities to ourselves. Therefore, children in poverty, with their existing family problems, will grow up to form relationships with those who similarly have grown up in poverty and have their own family problems. The resulting offspring from such couples will inevitably follow the same patterns of development and hold similar preferences once they reach adulthood themselves. And so the cycle is endless. Child poverty results from both parents growing up in a relatively similar way. Sir Keith has been challenged just like Lewis, for not explaining how poverty actually starts, but also because it was suggested that not all children end up like their parents, and a number of them can in fact escape the cycle. Opportunities may arise for children that did not arise for their parents, they may form relationships with different kinds of people, or they may show a compassion for achieving that, although did not come from either parent, was just good fortune. And finally is the concept of underclass, which Jones and Novak(1999) describe as a brutal victim-blaming theory. They went on to write how poverty is caused by peoples behaviours and not their circumstances. For example there are many who go through periods of unemployment, are made redundant from current jobs, or who lose money due to household repairs, hospital bills, child support, etc. But of those people, not all of them sink into deprivation, the majority pick themselves up and go on to find something else, or look for support from friends and family until something comes along. Novak and Jones saw the problem to be those who come to rely on income support as a way of living. They were even more so concerned with the children who grow up in impoverished families, learning destructive values and beliefs and growing up to become delinquents. For these, poverty will continue across generations to come. Arguments against the underclass concept revolve around the fact that it negates consideration of structural factors as a cause of poverty, and the lack of evidence to support any of the suggestions made. Despite the criticisms to Individualistic theories, they still hold a high power in modern society. Politicians like Tony Blair for example have stated: This cycle of deprivation is bad for everyone. But it is particularly unfair for children who miss out on opportunities because they inherit the disadvantage faced by their parents, so their life chances are determined by where they come from rather than who they are. The final theory looks at structural explanations for child poverty, primarily directed at the economic standards for any area, child development services on offer, and various other components which form the foundations for living. Supporters of this view takes a Marxist approach; that a class system is necessary, for those at the higher end rely on those at the lower end to provide them with work staff, who they exploit and employ on menial wages. And so there will always be poverty, well at least until capitalism is defeated. Or when society moves towards equality of all its members irrespective of their situation and/or upbringing. Such a concept seems unlikely, as it lacks a sense of fairness to those who see themselves as more deserving. Although it is a misconception that those people in poverty have brought it upon themselves, there is a grain of truth in the matter. The actuality is that those well off have earned it, through hard work and good business sense, while many of those in poverty never managed to do well in school, missed out on opportunities, and failed to achieve. Child poverty results from a continuation of generations of un-achievers, and so there will always be able bodies to recruit into the unprofessional workforce. Marxists go on further to suggest that SW is another of lifes necessities, because social workers ensure that poverty is kept stable. They argue that SW does not aim to cure poverty, nor does it aim to remove people from their impoverished lives. Rather, SW looks to protect the well being of individuals and keeps them from distressing and becoming incapable of work. To do this, workers take service users focus away from blaming the system, and persuade them to look at faults of their own, their shortcomings and their failures. By doing this, SW manages to halt any challenge to the system that individuals may pose such as groups forming who speak out against the oppressors. In conclusion, there are numerous causes for child poverty, but at its roots the government has stated that worklessness is their primary concern, which interacts alongside with family dysfunction, neglect and insecure attachments, low quality day-care and schooling, and state of neighbourhood. With fewer work opportunities more people are having to settle for meagre salaries until something better comes along (which it wont). There is also an increase in the number of single parents, due to increases in death rates and divorce among the poor. With only one source of income, and a loss of support when it comes to raising children, single parents are forced to depend on income support. As a result, they will never manage to find their way out of poverty. References Bailey and Brake, Corrigan and Leonard, Bolger, Becker and MacPherson, Adams, The British Journal of Social Work; Poverty and Social Justice, Oxford Journals, 1975, 1978, 1981, 1988, 1998. Blair, T. Breaking the Cycle: Taking stock of progress and priorities for the future; A Report by the Social Exclusion Unit. The Office of the Deputy Prime Minister; London. ODPM publications, 2004. Bruce, M. L. Hoff, R. A. Social and physical health risk factors for first-onset major depressive disorder in a community sample. Social Psychiatry and Psychiatric Epidemiology, 29, 165-171, 1994 Cooley, C. Human Nature and the Social Order, New York: Charles Scribners Sons, revised edn, 1922 Denham, A. Garnett, M. From the cycle of enrichment to the cycle of deprivation: Sir Keith Joseph, problem families and the transmission of disadvantage. Policy Press; Benefits, Volume 10,Number 3, pp. 193-198(6), 1 October 2002 Department of Health Saving Lives: Our Healthier Nation. London: Stationery Office, 1999b Duncan, G. J. Brooks-Gunn, J. Consequences of Growing Up Poor. New York: Russell Sage, 1997 Gans, H. The Uses of Poverty: The Poor Pay All, Social Policy: pp20-24, July/ August 1971 Jarvis, E. (1971) Insanity and Idiosy in Massachusetts: Report of the Commission of Lunacy, 1855. Cambridge, MA: Harvard University Press, 1971 Jones, C and Novak, T. Poverty, welfare and the disciplinary state. London: Routledge, 1999 Joseph Rowntree Foundation, Inquiry into income and wealth. Volumes 1 and 2. York: Joseph Rowntree Foundation, 1995 Joseph Rowntree Foundation, Becker, Smale, Social Exclusion Unit, Sociology and Social Work; Poverty and Social Work Service Users, Learning Matters, 1995, 1997, 2000, 2004. Langner, T. S. Michael, S. T. Life Stress and Mental Health. London: Collier-Macmillan, 1963 Lewis, O. The Children of Sanchez. New York: Random House, 1967. Novak, T. Critical Social Policy; Rethinking Poverty. Vol 15, Sage Journals, 1995 The PSE survey, Joseph Rowntree Foundation, http://www.bris.ac.uk/poverty/pse/

Types of power supply and their applications

Types of power supply and their applications Types of Power Supply and their applications Power supply is a device used to provide the electric energy to operate the devices running on electric power. It has many special ways to provide electric energy to a specific system â€Å"it is mother of the system† ( Brown, 2001, p.1 ). The basic functionality of power supply is to convert Alternative Current voltage to regulated Direct Current voltage required by electronic devices. A typical power supply has four different modules each of them has a specific function. (Source: http://www.kpsec.freeuk.com/powersup.htm) Transformer is the first module and its function is to convert high voltage Alternative Current to low voltage Direct Current. The second module is Rectifier and its main function is to convert low voltage Alternative Current to Direct Current. The third module is Smoothing, the Direct Current produced by the Rectifier is varying, so Smoothing reduces this variation to small rippling. Last module is Regulator, it sets the Direct Current voltage to fixed value by removing the ripples. This is a basic design of power supply. The design can be huge and complicated based on the requirements. This essay will present the four major types of power supply which are Linear Regulators and Switching Mode Power Supply, Programmable Power Supply, Uninterruptible Power Supply. The first type of power supply is Linear Regulated Power Supplies. They are the basic type of power supply. they produce the regulated output voltage by dropping the input voltage. To achieve this, it relies on variable conductivity of an electronic device. Hence, the lot of power wasted in the form of heat. â€Å"it is though, a very electrically quiet power supply† (Brown, 2001, p.11). they are often used in ground based equipment and distributed power systems. Linear regulated power supply function by converting varying Alternative Current input to regulated Direct Current output. The typical circuit used in this type has two range. One allows more voltage at lower current and the other allows more current at lower voltage. Linear regulated power supplies come in two basic forms called series regulators and shunt regulators. Series regulated power supplies are most common form of linear regulated power supply. The power dissipated in series regulated device is the product of power supply output current and the voltage drop. Shunt regulated power supplies are the simpler form of Linear Regulated power supply, but they are less efficient. Simplicity is the main advantage of linear regulated power supplies. They have been widely used in industry for a long time. They are used in systems that require extremely low noise. They are more suitable and cost effective for low power applications. They are used in ground based applications and distributed power systems. Since the linear regulated power supply has very low power output voltage ripple, it is used in low noise / low ripple applications such as communication and radio device where noise is very critical. It is more efficient in the application which output voltage is almost equal to input voltage. The second type of power supply is Switching Mode (SMPS). It operates in ON-OFF mode. It uses switching circuits and energy storage elements such as capacitors and inductors to get the regulated output voltage. â€Å"These circuits are ideally lossless with 100% energy transfer† (Johnny, 2006, p.1). The main advantage of Switching Mode Power Supply is the higher efficiency because of low power dissipation. It is simpler and light weight because of the elimination of heavy low frequency transformers and generates low heat. It is used in domestic products which often have universal inputs. Mobile phones have changed their power supply technology from linear regulated to Switching Mode Technology. It is widely used in aircraft electric power such as airplane ground support. The third type of power supply is Programmable Power Supply. It provides the power through a computer interface. It generally depends on both Linear regulated and Switched Mode technologies to produce accurate output power. A Programmable power supply typically consists of microcontroller, current, voltage programming circuits such as analog to digital convertors, serial peripheral interface, keypad and a LCD display. The desired voltage parameter is given as the input to microcontroller through key pad. Intern, microcontroller convert analog voltage from a voltage source to digital through analog to digital convertor. This digital voltage is regulated through serial peripheral interface to get the desired voltage which is inputted to microcontroller through keypad. The main advantage of programmable power supply is that accurate required voltage can be produced which is not possible from either linear regulated or switching mode power supply. It is mainly used in automated equipment testing. They are also used in ultrasonic vibration measurement tools. The last type of power supply is Uninterruptible power supply. It is widely known as UPS or power back up. It is widely used as backup power to protect the devices from crashing due to sudden power loss. There are three major categories of Uninterruptible power supply, offline -standby, online and line-interactive. The first category is Offline /standby Uninterruptible power supply. It provides surge protection and battery back-up up to 20 minutes. When the input power supply falls below the threshold level, then Uninterruptible power supply turns on its power circuit providing power backup to the device up in certain time (In this type 20 minutes). Line-Interactive Uninterruptible power supply is the second category. It generally uses only one main power convertor to generate the power. â€Å"With its low cost and durability, the line-interactive UPS has been used successfully in millions of IT installations worldwide† (Hoff and Samstad , 2004) . The typical protection time varies from 5 minutes to 30 minutes. The last category is Online, the operation of Online Uninterruptible power supply is very similar to Standby or Line-Interactive type. The typical protection time varies between 5 minutes to 30 minutes. But, it provides electrical firewall between incoming utility power and sensitive electronic equipment. The main purpose of Uninterruptible power supply is to provide the protection to devices from crashing due to sudden power loss. Some of the Uninterruptible power supplies are also capable of correcting the common utility power problems such as, total loss of input voltage, momentary increase or decrease input voltage, spikes , noise. They are mainly used for surge protection and back power for computers, data centers and telecommunication equipment. They are used to provide the electric isolation for the equipment which are sensitive to power fluctuations. In conclusion, there are various sources of power being used to provide the power to the systems effectively and efficiently. For example, solar energy and wind power are being converted to electric energy to provide the power to large industrial applications. Power supplies are the heart of any system which requires electrical energy. They not only provide power but also provide the protection to the system against outside disturbances. Therefore, design and development considerations of a power supply are more important. As technology is growing, more advanced power supplies are being invented to provide best protection and efficient power to the devices.

The Similarities Between Classical Music and Ellingtons Jazz Essay

One of the greatest tragedies in the 20th century can be seen in the debasing of the Jazz genre as a unworthy equal to it’s predecessor, European Classical music. This can be seen in various statements about Jazz, such as Boris Gibalin commit, â€Å"The â€Å"Jazz Mania† has taken on the character of a lingering illness and must be cured by means of forceful intervention.†1 This conflict can be traced through out the history of Jazz, as Classical composers have relatively disregarded this new type of music. Before Duke Ellington’s Cotton Club performances, Jazz play on the radio was delegated for late night audience only. This sub-culture treatment has led many critics to disregard the Jazz movement as a dance craze, or unsuccessful recreations of Classical pieces. This slandering of Jazz has not only created a false image of the music, but it has also lead to a full disconnection between the two genres. It is for this reason that I propose in my pap er to show the relationship between these two musical categories. My hopes in demonstrating these similarities is to disassemble the schism of ignorance built between the two, and place both Jazz and Classical music on equal footing.   Ã‚  Ã‚  Ã‚  Ã‚  Critics of Jazz have always perpetuated this schism by utilizing the reasoning behind Jazz, that of it being a free form interpretation, to question the legitimacy of calling a Jazz leader a composer. For how can one be styled as a proper composer and still remain true to the Traditional Jazz concepts? The classic composer has at their disposal highly skilled musicians who are trained to work within professional bodies, such as a symphony orchestra or string quartet, and who then relies on the efficiency of these professionally trained bodies to interpret his scores as he sees fit. On the surface this appears to run contradictory to the Jazz composer whom, â€Å"Has to write for specific combinations which do not exist until he brings them into being, and to rely on highly individual executants whose personal style must be blended together to give expression to his own ideas without†¦losing their individuality†.2 Yet to interpret this blending of highl y individualistic sounds as proof of a schism between this and the rigidly structured Classical composer is a false impression. This fallacy can be attributed to overemphasizing the sporadic and improvisational aspects of Jazz and refusi... ...usical category. From Bach to Mozart, Beethoven and even Tchaikovsyky employed it as a stylistic feature in their pieces.   Ã‚  Ã‚  Ã‚  Ã‚  In conclusion, one can see the shared characteristics of the two musical styles. Yet I find myself pressing again the reasoning for this paper, for I must submit that I am in no way declaring that Classical music equates Jazz. The two musical categories are different in numerous ways, but one must wonder does this difference justify the mistreatment of Jazz. Throughout history great innovations have been created not thought the passive means, but through the torrent fires of dissent. Classical music has born the scars of numerous dissenting musicians, all of who now stands as pinnacles of their craft. Yet now we have arrived at a time in which this reverent originality has become cause for scorn, and it is this debasement that I am addressing. By showing the similarities of the two genres, I had hoped in quenching this distaste for Jazz. This musical elitism that is being perpetuated can lead only to a disastrous finale for all who engage in it. Duke Ellington has it right when he stated, â€Å"There are only two types of music, good music and the rest.†18

themebeo Epic of Beowulf Essay - Style, Structure and Theme

Style, Structure and Theme of Beowulf  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚      A consideration of the stylistic features in the classic poem Beowulf involves a study of the poetic verse, the vocabulary, alliteration, litotes, simile, kennings, variation and double-meaning or ambiguity. A consideration of the structure and the theme of the poem involve a wide diversity of opinion on the subject.    First, let us talk about style. The poetic conventions used by this poet include two half-lines in each verse, separated by a caesura or pause. The half-lines are joined by the oral stressing of alliterative words in the half-lines, both consonants and vowels (Tharaud 34). â€Å"At least one of the two stressed words in the first half-line, and usually both of them, begin with the same sound as the first stressed word of the second half-line† (Donaldson 67). When a word was stressed in the first half-line, its alliterative counterpart was stressed in the following half-line; the words could either complement each other, like holy/heaven or sin/enemy, or they could contrast each other like happy/wretched or warm/winter.    Oft Scyld Scefing   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   sceapena preatum monegum maegpum  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   meodo-setla ofteah (4-5)    The repetition of the â€Å"s† sound in line 4 and of the â€Å"m† sound in line 5 illustrate alliteration, and this occurs throughout the poem, providing to the listener what the rhyme of modern-day poetry provides – an aesthetic sense of   rightness or pleasure.    The vocabulary of the poem is remarkable in several ways. First of all, about one-third of the vocabulary is compound words. For the concept of   â€Å"the sea† there are 50 different compounds; likewise there are 50 compounds ... ...d Bloom. New York: Chelsea House Publishers, 1987.    Shippey, Thomas A.. â€Å"Structure and Unity.† In A Beowulf Handbook, edited by Robert Bjork and John D. Niles. Lincoln, Nebraska: Uiversity of Nebraska Press, 1997.    Sisam, Kenneth. â€Å"The Structure of   Beowulf.† In Beowulf: The Donaldson Translation, edited by Joseph F. Tuso. New York, W.W.Norton and Co.: 1975.    Tharaud, Barry. â€Å"Anglo-Saxon Language and Traditions in Beowulf.† In Readings on Beowulf, edited by Stephen P. Thompson. San Diego: Greenhaven Press,1998.    Tolkien, J.R.R.. â€Å"Beowulf: The Monsters and the Critics.† In Beowulf – Modern Critical Interpretations, edited by Harold Bloom. New York: Chelsea House Publishers, 1987.    Ward & Trent, et al. The Cambridge History of English and American Literature. New York: G.P. Putnam’s Sons, 1907–21; New York: Bartleby.com, 2000

Gel Electrophoresis

Laura Gallagher Partner: Rob Einersen Biology Period D Mr. Alvarez 15 February 2013 Gel Electrophoresis Introduction: Agarose Gel Electrophoresis is a process in which the process of determining whether a strand of DNA is either positively or negatively charged. The container in which the gel is stored has a negative and positive side; whichever side the DNA molecules go to means the DNA is charged the opposite way. (Ware, Lunte, Gardiner)For example if a DNA molecule goes to the negative side that means that the DNA is positively charged and vice versa.The agarose gel is composed of a fine powder substance, water and a buffer solution. The solution must be boiled to its boiling point then you have to pour the solution into a casting mold there also needs to be a comb that leaves six holds in the mold. It must be left in the casting mold for about a half an hour for the gel to solidify. Electrophoresis has a few different uses such as establishing the size of a strand or molecule of DNA or RNA. (Bowen) It can also be used to find out family members or criminals or tests of that manner. This is all possible because of the DNA’s charge and the charge of the molds.Although if a DNA molecule is too big it is not going to be able travel fast through the so it is better for the experiment if the DNA molecules are small. To get the DNA small restriction enzymes are used. (Roberts) Restriction enzymes cut specific DNA molecules in half which helps with the travel through the gel. Before the electrophoresis machine was developed people used to use gravity to separate DNADNA molecules are going to be negative and smaller molecules are going to move farther than the larger molecules. The purpose of this lab is to learn how to create an agarose gel and properly load a well in an agarose gel.The purpose is also to learning how to use electrophoresis equipment and how to analyze the results of DNA electrophoresis. Methods and Materials: Start off, by gathering all of the necessary materials for the beginning which is 1. 2 mL of gel buffer in one graduated cylinder, in a separate graduated cylinder58. 8 mL of water and 0. 48 g of agarose powder. Next take an Erlenmeyer flask and mix all three of the substances, place the flask on a hot plate and keep swooshing the mixture in the flask. Repeat that step until the liquid in the hot plate becomes clear, make sure that the solution does not boil.Let the solution sit until it is lukewarm. Now, the molding tray should be prepared by taping off the sides with painters tape so no liquid can escape. Place the comb in the designated slot in the molding tray and pour the agarose solution into the mold tray. Now, take a graduated cylinder and pour in 8 mL of the buffer solution and 400 mL of water, then, pour it into the gel box. After the gel solidifies, with extreme caution, remove the painters tape and comb. Next, take the mold tray and place it on the table; now, take six disposable pipettes and the colo red dye from you teacher and fill each pipette with a different color.After each pipette has a different color, empty the pipette not too far in or too close to the surface of each well. Next, place the mold tray in the gel box, close the lid, and plug it in for about a half an hour. After the half an hour is up, take a couple pictures of the mold tray and the results that you saw. Results: Figure 1 Figure 2 As you see in figure 1, the dye pigments have been placed in each well and it is not perfect some of the dye have gotten out and leaked out on the top of the gel.That is okay though because the experiment was still a success because the dye pigments did move with the DNA molecules as you can see in figure 2. The dye pigments in all of the wells except for the well at the very top, all moved towards the positive side of the tray. The well at the very top contained positively charged DNA so that DNA started to move towards the negative side of the tray. Discussion: For the most pa rt, my hypothesis was correct, I was correct about the smaller particles moving further than the larger particles. I was correct and incorrect when I said that The DNA molecules are going to be negative. I as correct because five out of six were negative, although there was one that was positive so it did not go in the same direction as the other five. DNA’s direction is only influenced by one factor, which is whether the DNA is negatively or positively charged. This directly affects why the DNA moved the positive pole because DNA is negative so due to attraction it goes to the positive side of the pole. When a molecule is moving its rate of length and speed correlates with its size, if a molecule of DNA is large, it is going to be harder for it to move so it would be much easier for a small molecule of DNA to move across the gel.You can the molecules of DNA moving because they are dyed with the dye pigments. Electrophoresis causes the smaller DNA molecules to move further be cause it is easier for the positive charge to pull smaller pieces of DNA. Though, for this to happen, the power has to be turned on. Once the power is turned on it also turns on each end’s charge on each side of the tray so the DNA is attracted to that side of the tray. Most of the DNA the molecules carried a negative charge. A negative charge is carried because those molecules went towards the positive pole.Although those few molecules carried a positive charge so they went to the negative pole. The banding patterns in the gel are determined by the size of the DNA molecule. It can be interpreted as some of the DNA molecules weren’t broken down as small as others. Scientists use the number of nucleotides in one sample and it is compared to another blood sample. All of the similarities and differences add up. Also the sequences of the bases in a chain of DNA. In many murder investigations, DNA is used to find the culprit. Such as the case of James Anagnos, James was bea ten and stabbed to death in 1977 in his bar. NBC) James was holding a strand of hair that belonged to his murderer. Three decades later they compared the DNA is the strand of hair to a man named Frank Wright, it was a match. It didn’t serve any justice though, because Wright died in 2002. This is similar to the case of Priscilla Ann Blevins. Priscilla’s remains were found off an interstate and they were stored in a facility and kept under the name â€Å"Jane Doe†. (Lohr) Blevins’ genetic information was entered into a computer and it matched up with â€Å"Jane Doe† and was later confirmed with dental records.DNA helped to resolve this 37 year old cold case just like it did for the 1993 murder of Alie Berrelez. Alie was a five year old girl who was sitting in her apartment complex eating pizza when she was kidnapped. (Curry) Alie’s remains were found four days later stashed next to a creek. Nick Stofer was the main suspect but they couldnâ₠¬â„¢t arrest him because they didn’t have enough evidence against him. When this crime happened there was no such thing as DNA testing so there was no way they could prove it was him. In 2011, they compared DNA from Alie’s under to Nick Stofer and it was a match.Again Stofer died before he could stand trial, he died in 2001. Bibliography B. R. Ware,  Susan Lunte,  Kathleen Gardiner, 2012, â€Å"Electrophoresis,† in AccessScience,  ©McGraw-Hill Education, Retrieved from http://www. accessscience. com/content. aspx? searchStr=Electrophoresis&id=226400 Bowen R. , 2000, â€Å"Agarose Gel Electrophoresis of DNA†, in Colostate, Retrieved from http://arbl. cvmbs. colostate. edu/hbooks/genetics/biotech/gels/agardna. html Richard Roberts, 2012, â€Å"Restriction enzyme,† in AccessScience,  ©McGraw-Hill Education, Retrieved from http://www. accessscience. com/content. aspx? earchStr=restriction+enzymes&id=584150 2010, â€Å"Three Decade Old Murder M ystery Solved Using DNA† , in NBC California, retrieved from http://www. nbclosangeles. com/news/local/Three-Decade-Old-Murder-Mystery-Solved-Using-DNA-101944298. html Lohr D. , â€Å"After 37 Years, Priscilla Ann Blevins' Disappearance Solved Using DNA†, Huffington Post, Retrieved from http://www. huffingtonpost. com/2012/11/01/priscilla-ann-blevins_n_2059155. htmlCurry C. , 2011, â€Å"Cold Case of Murdered 5-Year-Old Alie Berrelez Solved†, ABC News, retrieved from http://abcnews. go. com/US/cold-case-year-murdered-1993-solved-dna/story? id=14510785

Murabaha Essay

Bai-Murabaha may be defined as a contract between a Buyer and a Seller under which the Seller sells certain specific goods permissible under Islamic Shariah and the Law of the land to the Buyer at a cost plus agreed profit payable in cash or on any fixed future date in lump sum or by instalments. The profit marked-up may be fixed in lump sum or in percentage of the cost price of the goods. In respect of dealing parties Bai-Murabaha may be of two types. 2. 01Ordinary Bai-Murabaha If there are only two parties, the seller and the buyer, where the seller as an ordinary trader purchases the goods from the market without depending on any order and promise to buy the same from him and sells those to a buyer for cost plus profit, then the sale is called Ordinary Bai-Murabaha. 2. 02Bai-Murabaha on Order and Promise If there are three parties, the buyer, the seller and the Bank as an intermediary trader between the buyer and the seller, where the Bank upon receipt of order from the buyer with specification and a prior outstanding promise to buy the goods from the Bank, purchases the ordered goods and sells those to the ordering buyer at a cost plus agreed profit, the sale is called â€Å"Bai-Murabaha on Order or Promise†, generally known as Murabaha. This Murabaha upon order and promise is generally used by the Islami Banks, which undertake the purchase of commodities according to the specification requested by the Clients and sale on Bai-Murabaha to the one who ordered for the goods and promised to buy those for its cost price plus a marked-up profit agreed upon previously by the two parties, the Bank and the Client. In this Bank, Bai-Murabaha is treated as a contract between the Bank and the Client under which the Bank purchases the specified goods as per order and specification of the Client and sells those to the ordering Client at a cost plus agreed upon profit payable within a fixed future date in lump sum or by fixed instalments. Thus it is a sale of goods on profit by which ownership of the goods is transferred by the Bank to the Client but the payment of the sale price (cost plus profit) by the Client is deferred for a fixed period. It may be noted here that, in case of Bai-Muajjal and Bai-Murabaha, Islamic Bank is a financier to the Client not in the sense that the Bank finances the purchase of goods by the Client, rather it is a financier by deferring the receipt of sale price of the goods sold by the Bank to the Client. If the Bank does not purchase the goods or does not make any purchase agreement with seller, but only makes payment of any goods directly purchased and received by the Client from the seller under Bai-Muajjal/Bai-Murabaha Agreement, that will be a remittance of the amount on behalf of the Client, which shall be nothing but a loan to him and any profit on this amount shall be nothing but Interest (Riba). Therefore, purchase of goods by the Bank should be for and on behalf of the Bank and the payment of price of goods by the Bank must be made for and on behalf of the Bank. If in any way the payment of price of goods is turned into a payment for and on behalf of the Client or it is paid to the Client any profit on it will be Riba. It is permissible for the Client to offer an order to purchase by the Bank particular goods deciding its specification and committing himself to buy the same from the Bank on Murabaha, i. . cost plus agreed upon profit. 3. 02It is permissible to make the promise binding upon the Client to purchase from the Bank, that is, he is to either satisfy the promise or to indemnify the damages caused by breaking the promise without excuse. 3. 03It is permissible to take cash/collateral security to guarantee the implementation of the promise or to indemnify the damages. 3. 04It is also permissible to document the debt resulting from Bai-Murabaha by a Guarantor, or a mortgage, or both like any other debt. Mortgage/ Guarantee/ Cash Security may be obtained prior to the signing of the Agreement or at the time of signing the Agreement. 3. 05Stock and availability of goods is a basic condition for signing a Bai-Murabaha Agreement. Therefore, the Bank must purchase the goods as per specification of the Client to acquire ownership of the same before signing the Bai-Murabaha agreement with the Client. After purchase of goods the Bank must bear the risk of goods until those are actually sold and delivered to the Client, i. e. after purchase of the goods by the Bank and before selling of those on Bai-Murabaha to the Client buyer, the Bank shall bear the consequences of any damages or defects, unless there is an agreement with the Client releasing the Bank of the defects, that means, if the goods are damaged, Bank is liable, if the goods are defective, (a defect that is not included in the release) the Bank bears the responsibility. The Bank must deliver the specified Goods to the Client on specified date and at specified place of delivery as per Contract. 3. 8The Bank shall sell the goods at a higher price (Cost + Profit) to earn profit. The cost of goods sold and profit mark-up therewith shall separately and clearly be mentioned in the Bai-Murabaha Agreement. The profit mark-up may be mentioned in lump sum or in percentage of the purchase/cost price of the goods. But, under no circumstances, the percentage of the profit shall have any relation with time or expressed in relation with time, such as per month, per annum etc. 3. 09The price once fixed as per agreement and deferred cannot be further increased. 3. 0It is permissible for the Bank to authorise any third party to buy and receive the goods on Bank’s behalf. The authorisation must be in a separate contract. Request potential Client to open an Al-Wadia Current Account. Let him maintain the Current Account satisfactorily for a reasonable period. (This will generally mean six months). 4. 02Hold preliminary discussion with the prospective Client regarding his Investment needs and business experience. 4. 03Brief him on the salient features of â€Å"Bai-Murabaha† Mode of Investment. Apprise, in particular, the usual terms and conditions under which the Bank makes such Investment. 4. 04Look to the past performance of the Client. Check-up Head Office Current Investment Policy and Branch’s track record of Bai-Murabaha Investment of the item(s). 4. 05If the Proposal is found suitable, advise the Client to submit formal Application (F-167A -as per specimen at page 34). If not found suitable, regret politely.