Body Shape and Gender

Body Shape and Gender Body Shape and Gender differences in ratings. Introduction Body image is the way people perceive themselves and equally important, the way they think others perceive them. Body image is constantly changing, and is always being modified by biological growth, trauma, or decline. It is also significantly influenced and moulded by life circumstances which bring about pain or pleasure. There are many factors that influence how people perceive their own body image and others. Factors such as culture have a significant influence on perceptions of body images. As people tend to compare their self to what is acceptable within their own culture, and see if they match the standard of others. Although, womens perception of the ideal body shape, is a thin one. Delameter 2004 stated that attraction is characterised as an attitude, which consists of feelings beliefs and behaviours, whether it is a positive or negative one is dependant on the persons perception of the individual. Socio cultural theory The sociocultural theory is a perspective that presents the idea that human behaviour is affected by cultural influences. It highlights the important of cultural values in understanding how individuals are perceived by others and how they perceive themselves. In relation to body image and attractiveness, the sociocultural perspective would offer the idea that if the culture deems attractiveness to be important and is admired within its members, then individuals within the society will value attractiveness in themselves as well as others, and the same idea would apply if the culture deems attractiveness to be of less importance then the members of the society would then not look into the importance of attractiveness within themselves or others. Within the socio cultural theory there are three approaches which help to explain the role of physical attractiveness in everyday life. The first theory being the social expectancy theory, this theory argues that cultural values influence perceptions of others and the behaviour, which in turn influences the behaviour of others which then has an impact on the self perception of others. The â€Å"self fulfilling prophecy† is the sequence of events that happens in order for people to make judgments on others, which are based on the other personss and expectations, and then the individual is led to believe they are as the perceiver expected them to be. An example of this in relation to body image, if a shop assistant was helping a customer chose clothes and had to fetch the customer clothes without asking for their size, and kept bringing back larger sizes. The customer may then begin to think that as the shop assistant perceives them to be larger that they are actually much large r and if such events occurred over a number of times the customer would then believe it to be true over a period of time. There are many hypotheses that derive from the social expectancy theory such as: There is a consensual agreement within cultures about who is attractive and who is not attractive, but variability among cultures. There are consensual expectations within cultures about attractive and unattractive others, but variability among cultures. People behave differently toward attractive and unattractive others. Peoples differential behaviour toward attractive other results in differences in how they respond. These behavioural differences result in differences in the elf-concepts of attractive and unattractive others. There is very little research looking into the reasons why attractiveness is valued, or why some faces and body characteristics are considered attractive and others are not. The next approach descending from the socio cultural theory is the implicit personality theory. This approach focuses on the knowledge structure that people use to make sense of their social world, which is to understand and predict the behaviour of others. Implicit theories are conceptualised as cognitive structures that consist of personal attributes an inferential relations that specify the degree to which attribute are related. An example of the attribute â€Å"intellectual† might be expected to go well with the attribute â€Å"studious† rather than the attribute â€Å"nervous†. Implicit personality theory provides a framework for understanding the physical attractiveness stereotype. The category label physically attractive is presumed to be linked to a variety of attributes; the number and nature depend on the culture. Cultural information is transmitted through direct observations of attractive others and by exposure to cultural representations of attractiveness. However, the theory does not explain why different cultures associate different attributes with attractiveness. The final theory to stem from the social cultural theory is the status generalisation theory which has evolved from sociological theories. The theory suggests that external status characteristics are used to generate expectation states regarding performance, with or without prior association between these characteristics and performance and with or without conscious awareness. Status generalisation theory views physical attractiveness as a â€Å"diffuse† status characteristic because if discriminates among individuals and establishes performance expectancies â€Å"without-limit† that is, without regard to the actual relevance of attractiveness to performance. From the status generalisation perspective, physical attractiveness should be associated with a wide range of desirable attributes in both perceptions of others and self perceptions. Similarly, like the social expectancy theory and implicit personality theory, the status generalisation theory predicts that people hold more positive expectations for attractive than unattractive others. All three theories predict that people behave more favourably towards attractive than unattractive others, and that more favourable treatment results in more favourable self-concepts for attractive people. The socio cultural perspective, states that culture defines what an attractive body is and self perceptions of body attractiveness depend on these cultural definitions. The closer body self perceptions comes to the ideal, the higher the self rating should be of body attractiveness. Therefore, body image should depend on cultural ideals and on how an individual perceives his or her own body in relation to these ideals. This also, suggests that culture is an important issue which frames certain individuals perception on their body image, and perception of others. Research following the socio cultural perspective has been found to suggest that body ideals vary among cultures as well as within cultures across groups and time. Present-day Western cultures idealise thinness for females and an average type for males. The thin ideal for women replaced the more full d one of the 1950s, and may soon be replaced by† fitness â€Å"ideal that began to emerge in the 1990s.) Evolutionary theory â€Å"The evolutionary theory argues that for the existence of universally shared criteria of attractiveness, which are cues to a persons potential reproductive success† Buss (1999) according to this theory, females are believed to select partners that will enhance their reproductive success, and the biological features are deemed to be found more attractive. It is stated that the biological features are â€Å"to honestly signal that one individual is more â€Å"desirable† then another† Buss 1999. Culture Within many different cultures there are different standards of what attractiveness is, and there are a wider range of acceptable weights and shapes. Within the â€Å"white† Western culture female attractiveness consists of a slender body shape. Slenderness is generally associated with happiness, success, youthfulness and social acceptability. Over weight for both men and women has been seen as physically unattractive and is also associated with other negative characteristics. Research from Bordo (1993) found that excess flesh started to become linked with low morality, reflecting personal inadequacy or lack of willpower. Slenderness symbolises being in control, which in turn is seen as an attractive feature. The firm toned body is seen as representing success. Most people do not have slim, toned bodies, so they have to work towards fitting in with the norm of society. Bordo states that the current idealisation of slenderness is that the body is kept under control â€Å"The ideal here is of a body that is absolutely tight, contained, bolted down, firm† (Bordo 1993: 190) In a study by Tiggemann and Rothblum (1988) asked a large number of students about their stereotypes of fat and thin men and women. They were asked to rate the extents to which eight qualities were typical of thin men and women and fat men and women. Men and women in both cultures reported negative stereotypes if fat people. Although, fat people were seen as warmer and friendlier, confirming the traditional stereotype of the fat jolly person, they were also viewed as less happy, more self indulgent, less self confident, less self disciplined, lazier and less attractive than thin people. These judgements were marked of fat women than fat men. The results indicate negative stereotyping of fat people, especially fat women. Tiggemann et al stated that from the findings they found â€Å"there were no differences in stereotyping between students who were fat and those who were thin. Even those who were overweight had negative stereotypes of fat people† Dion researched the link between attractiveness and positive personal qualities. He stated that â€Å"What is beautiful is good† Dion et al 1972: 285). Dion stated that people tend to assign more favourable personality traits and life outcomes to those they perceive as attractive. More recent supporting evidence came from Eagley (1991) suggested that the effects of physical attractiveness stereotypes are strongest for perceptions of social competence. Negative stereotyping of overweight may be a specific aspect of the physical attractiveness stereotype that refers specifically to assignment of negative traits to those who have a body size and shape that is not considered attractive by dominant groups in western cultures. It is often assumed that womens obsession with weight is linked with their desire to be attractive, to men, but research from Fallon and Rozin (1985) disagrees with this idea. They conducted an experiment which consisted of participants were shown line drawings of women ranging from extremely thin to extremely fat. It was found that women chose their ideal as thinner than what they believed men to prefer and this is more evident to be done in adolescence Cohn et al (1987) which may have an impact on how women rate and judge other womens bodies, and levels of attractiveness. The societal pressure hypothesis states that, the thin standard of beauty seen in the mass media encourages women to strive for unrealistically thin Silverstein et al (1986). Whereas, in African cultures â€Å"black† females have described their standard of an ideal body on non body factors such as style of clothes, skin, ethnic pride and so on. The black community has a unique view of ideal weight and body size compared to white mainstream culture. Black women tend to support a larger and more moderate idea body size than the very thin ideal that is favoured by the white western societies. Also in contrast, to overweight white women, over weight black women are more likely to view their bodies as attractive. There is also less prejudice against overweight people amongst the African cultures. Jackson and McGill (1996) found that when black men were asked to â€Å"relate several descriptors with the term â€Å"obese† they were more likely to associate positive characteristics such as â€Å"attractive† and â€Å"generous† and less likely to state negative attributes such as â€Å"lazy† or â€Å"uneducated† compared to the opinions of white men. Similarly, black women were more likely than white women to relate â€Å"sexiness† with â€Å"obese† in regard to same race men.† This more tolerant and appreciative view of overweight and obese body sizes likely. Langlois 2000 most research on physical attractiveness dominates research on attractiveness as it maybe most accessible trait when first meeting someone. Whereas in Western societies Furnham 1983 found that there is an inverse relationship between high social class and low body weight, the inverse is true of less developed, non-Western societies. As it has also been shown that the longer immigrants have been in Western societies, the less obese they tend to be. This study examined how Kenyan Asian, British and Kenyan British females from similar backgrounds perceived female body shapes. As predicted, the Kenyans rated larger more favourably and smaller less favourably than the British. Also, as predicted, it was found that the Kenyan Asian British were more similar to the British group in their perceptions. The results support the view that social and cultural factors play dominant role in the perception of ones own and others body shapes. In addition, the results reveal that in Britain preferences for small body shapes to the point of being anorexic are not uncommon. WHR ratio It is difficult to state where fat is distributed and to comment on whether it is appropriate or inappropriate. Before puberty boys and girls have roughly the same pattern of fat distribution. However when puberty strikes, due to oestrogen, it causes fat to be placed around the hip area of the body. The affect on male bodies is that testosterone causes the body to distribute the fat around the abdominal region. The fat distribution is measured by the wait hip ratio (WHR). The WHR is obtained by taking an individuals waist at the narrowest point, and hip measurement, and then finding the ratio of the two measurements. The WHR is a reliable index of the distribution of fat between upper and lower body according to Leibel, Edens and Fried (1989) also they stated that the loss or gain of 10 pounds doesnt appear to affect fat distribution. Healthy men typically have a WHR in the range of 0.85- 0.95 and for women the WHR is in the region of 0.67-0.80. In relation to attractiveness, it has become apparent that over the years the female has become more curvaceous over time. Later studies have looked mostly at select groups of women such as playboy centrefolds and Miss America contestants. Based on data from these populations, researchers have hypothesised that the female body shape is moving away from an hourglass shape and becoming curvier. This would indicate that women when rating bodies and their perception of them should favour the curvier shapes. However, when Singh (1993) re-examined the same data using the WHR, it was found that despite a reduction in total body weight, WHR has remained fairly stable at the measurement of 0.68-0.72 over the years. These ratios are still very indicative of an hourglass form. If women had a very curvaceous body shape their WHR would approach 1.0. Although, attractiveness does change over time, and these issues should be considered when men and women are rating body shapes for attractiveness as it may affect the scores they give. However, it does appear that the relation between a small waist and attractiveness has remained fairly similar. Mostly, western societys trends have been for women to exaggerate the smallness of this feature with a few exceptions, an example of this comes from periods such as the flapper period; where waist lines were eliminated. Research by Morris 1985 showed that in this â€Å"flapper† period women went to high levels of extremes to fit in with the small waist preference, and had their lower ribs removed. A narrow waist is often a preferred and†¦. Singh 1993 research found that both male and female subjects have the ability to use the WHR by itself to make judgements about womens attractiveness and other features which suggests that body shape is a very important variable, which should implicate that WHR is an important feature when body perceptions are made. Within Singhs study he allowed participants a 12 line drawing of female bodies, which four different WHR ratings. These images were also split into three body sizes of underweight, normal or overweight. , participants were then shown all images, and asked to rate the attractiveness of each in order. Participants were also asked other questions to group the images in certain groups. The results from this study found that participants can make discriminations about images, based on weight and WHR. The results also found that participants preferred women with lower WHR and found them more attractive than the higher WHR. The normal weighted were rated higher whereas, the unde rweight and overweight images were perceived as being less attractive. Singhs study implies that female attractiveness is associated with low WHRs, and that fat distribution is more important than body weight when determining attractiveness. Singh also stated that a small WHR was gender specific, so a low WHR is more favoured when the image people are presented with to rate are females have a low WHR. Male images with low WHRs are judged as least attractive no matter what their weight category is. Research by Palwlowski and Grabarcyk 2003 conducted research into WHR, and investigated the difference within WHR and the different components that are a part of WHR dimensions. They looked into the hip size and the waist size. In order to state which asset is more important when males are rating female attractiveness they conducted an experiment whereby participants were presented with a series of photographs where the WHR had been altered with, in either the hip or waist area. It was found that attractiveness was correlated negatively with WHR especially when it was manipulated. Although, some research by Tassinary and Hansen 1998 has suggested that hip size is more influential than waist size. In many traditional societies, living in relatively poor conditions, where fat reserves in hip and thigh regions may be important as an energy source during pregnancy and lactation, as it may be expected that there could also be a preference for wider hips. On the other hand, in modern societies; where there is no risk of having not enough food and where there are resources for financially poor mothers, resources are given to support them. Therefore, men may be harsher judges about waist size. Although, Tovee et al 1999 found that weight was more important than WHR when participants were judging womens attractiveness. Anorexics Body perception may differ between anorexic people, research by Furnham et al 1994 studied three groups of anorexic females, teenagers and mature adults, all participants were shown male and female body images which ranged in body size; from thin to fat. The participants were then asked to rate them on four categories using a 10 point rating scale. It was found that both anorexic and teenage groups rated the thinner women as more attractive than the mature females. Both mature and teenage females rated the fat female body shape more positively than did the anorexics. This study design was altered in the experiment that was conducted. Influential research Swami and Tovee (2005) researched the cues that are perceived to influence rating female attractiveness, which were bass mass index (BMI) and waist-to hip-ratio (WHR). This study examined the relative contribution of both cues in two different cultures; British and Malaysian. Both cultures were asked to rate the females images where BMI and WHR was presented with the image, and asked to rate the attractiveness of the image. The results showed that BMI is an influential factor whereas, WHR doesnt emerge as a predictor, which suggest that the WHR doesnt have any major impact when rating images for levels for attractiveness. Thornhill and Grammer 1999 used real images of women and this study also found that BMI is strongly correlated with attractiveness than is WHR. Swami, Salem, Furnham Tovà ©e (2008) criticise standard research into ratings because they often use ratings of unrealistic drawings of women. They developed a scale using real photographs of women the photographic rating scale (PFRS), taken from the front view and wearing a neutral costume. The PFRS was designed to overcome many of the limitations associated with line-drawn that are currently in use, including a lack of realism and poor ecological validity. Based on a sample of 208 adult women, the results of the study showed that the PFRS had good validity in that all images were correctly rank-ordered by BMI. Marlowe, Apicella Reed (2005) criticised standard research on this topic from a different angle they said that WHR has only been evaluated using front-on , where WHR involves waists and hips of varying comparative sizes. They created a scale of in profile and varied how large the s buttocks were. They concluded that womens actually vary regarding where the fat is deposited in some cultures (e.g. USA) it tends to be deposited on the hips (and is favoured/disfavoured there) whilst in other cultures (e.g. Tanzania)it tends to be deposited on the buttocks (and is favoured/disfavoured there. Smith, Cornelissen Tovee (2007) also had something to say about where fat is distributed and how different this can be from person to person. This prompted them to conduct a study using real womens bodies, where participants were shown many angles around the 360 degree spectrum. it appears that cardiovascular fitness may be a weak cue, at least in bodies not undergoing cardiovascular exercise. Instead, it seems that more salient cues, such as body mass and skin tanning, are the primary determinants of attractiveness judgements. The current study has been inspired by a popular news article in the Mail Online, which presented a range of 12 body shapes, including â€Å"Pear†, â€Å"Skittle† and â€Å"Goblet† (Trinny Susannah, 2007). This news article acknowledged the varying places where body fat can be distributed on the female . The current study intends to vary the positioning of body fat deposits and the amount of body fat, to test whether it is only WHR that affects raters judgements or other elements of body fat distribution. This will be accomplished using artificial widening and narrowing of three photos, to produce three sizes for three shapes being tested. It is anticipated that Differences in judgements between males and females and between body sizes are expected, as found in previous research. However, it is also anticipated that there may be some interesting differences in ratings depending on where body fat is distributed. It is expected that top heavy distribution of fat may be more unfavourably rated than bottom heavy or equally distributed body fat across all body sizes tested. However, there may also be interaction effects, for example, with only minor body shape differences for the narrower , yet greater body shape differences for the wider . There may also be an interaction between gender and these issues (e.g. males may be more discerning about body shape than females, or may be more discerning than females about body shape for some body sizes and not others). The hypothesis that arises from the previous research that has been discussed is: To investigate if there is a relationship between the different types of body shapes and the perception of body image between different genders. If there is an effect within altered body shapes and between gender overall. Method Participants A total of 180 participants were recruited at random from social networking website to take part in the online questionnaire. Most participants were selected from the university social network so the participants consisted of a range of individuals studying different courses. The participants age ranged from 18-25 with a mean of 21.5. An equal gender split sample was selected to participate. The participants were randomly assigned to a questionnaire, each questionnaire required 20 participants to take part in the study. 10 males and 10 females were randomly chosen to complete each the questionnaire. Materials The materials used in this experiment were the questionnaire, which was created using an online service. A copy of the questionnaire can be seen in the appendix (see appendix?). The questionnaire results are then logged online. The results will then be analysed using the computer program SPSS. Each questionnaire contains 9 different images, consisting of 3 original images which were altered in size. The original 3 were pear, skittle and goblet body shapes which are the stimuli. Design The experiment will be analysed through a three-way ANOVA on the attractiveness ratings: a 2 (Gender: Male, Female) x 3 (Body Size: Narrowed, Original, Widened) x (Body Shape: Pear, Skittle, Goblet). The independent variable is the reaction to body image. This will be measured through a rating scale, whereby participants will be asked to rate the level of attractiveness of the picture they are presented with. The attractiveness ratings are the central concern of this study, with the other ratings appearing to help reduce demand characteristics. Although each participant will rate just one stimulus, between participants three body shapes and three body sizes will be rated. The dependant variable is the image that the participant will be faced with, and the gender of the participant. Procedure Participants were randomly assigned to participant and complete one of the 9 questionnaires. There were 9 different images altogether; each of the 9 questionnaires had a different image. After this had been created, 9 separate online groups were created on the social networking website, which participants were then randomly allocated a website to click on and complete the questionnaire. Once the participant had been randomly selected, a link was sent the participant to complete the questionnaire. Once the participant clicked the link they were presented with the assigned questionnaire. The participant was given a brief description and outline of what the experiment asked them to do, and once the participant agreed they continued through with the questionnaire. The questionnaire consisted of questions regarding the participants age and gender. Participants will be faced with one, female stimulus to rate, followed by four questions, which will ask them to rate the stimulus on: attracti veness, healthiness, success and popularity. The rating scale will consist of 1 being â€Å"definitely not† attractive and so on and 10 being â€Å"extremely† attractive and so on. After the participant had then completed the ratings they were then presented with a small debrief description, and once they had done so an option of whether their participation was still acceptable to go on and be analysed was offered and the results were logged on the online survey website. Ethics Ethical issues with this study were addressed sufficiently and followed the BPS ethical guidelines in line with the methods used. The biggest issue was of informed consent. The participants could not be allowed to know the end aim of the study to eliminate demand characteristics. This was addressed by a number of steps being followed: the subject matter will be made clear from the start and the task will be clearly explained. Also the responses will be entirely anonymous; and, in the debrief contact details will be provided for help and advice on any matters that may have distressed participants, and the participants will have the right to withdraw from the experiment at any time. Another issue that may occur is the issue of psychological harm to the participants, as the participant may feel inadequate when viewing the image and compare themselves against the image they are presented with too much. This issue will be addressed by a detailed debrief explaining that the images are a fi ctional image, to help lower the low self esteem that may arise. Also participants if given a questionnaire with the researcher present may feel pressured and may think that they themselves are being judged by the researcher about their body image, as the experiment is about this issue. However, this issue will be minimised as the questionnaire is online, and the researcher will not be present and the participant may answer the questions alone and not feel pressured by the researcher. Another, issue that may have been if the researcher had to be faced with the participant, is physical risk of the participants health which is deemed to be minimal; however this is primarily an online survey so that it will involve participants using their normal computing facilities. For the online recruitment, the participants and researcher will not meet face to face. However, Should additional face to face recruitment be required, it will take place in the public areas of the University in location s that both participants and researcher frequent in their normal daily lives. Other issues such as clinical interventions are not involved in the study and it is not expected to involve the University with any financial or legal risks. The Psychological risk to the researcher is considered to be minimal because the researcher understands the nature of the study and what is involved in both the subject matter and the data collection process. Results A three way ANOVA was used to analyse participants ratings. There are 3 main effects that could affect each participants results. However within these effects there maybe some interactions between these through a two way interaction: 1) Body size x Body Shape 2) Body size x Gender 3) Body shape x Gender. By comparing body size x body shape x gender this is looking at a three way interaction was made. The mean of all scores was 4.9944. After a Post Hoc analysis was conducted and the results from this test are shown below. The main effects of the results are as follows. The results show that the ratings of images were not significantly affected by the factor Body Shape. Main effect of Body shape [F (2, 162) = 0.523; p = 0.594]. The main effect of Body size was significantly affected the rating the participant gave: [F (2,162) = 10.702; p=0.001]. Also, both genders were significantly different when rating all body shapes when they were widened (4.08) compared with original (5.28) and narrowed scores (5.62). The type of body size the participant was faced with impacted on the attractiveness rating they gave. The main effect of gender was shown to be significant [F (2,162) = 7.254; p =0.008]. The main effect of gender overall, the means were significantly different the average rating given by males was 4.61, whereas, the female rating was 5.38, showing a significant difference between scores. Below is a table showing the means for each body shape and gender. The table indicates that there is a significant difference between the average score of Goblet (low WHR) ratings, which show that males rate the Goblet (low WHR) lower 4.20 than females 5.60. Below, are graphs showing the interaction between all three factors and there average, mean scores, and the differences between scores. This graph shows the difference between the scores given of body size, between males and females. The means of all scores are shown. The graph indicates that overall, in all three body sizes, females rated the image higher than males. The mean for widened images shows that males significantly in particular rated this image lower 3.53 than females 4.63 this is a significant difference. (See table 1) The graph shows the interaction between the mean scores of body shape and gender. Females rated the all body shapes higher than males. The biggest

The Study of Si Surface Structures Essay examples -- Science Experimen

The Study of Si Surface Structures The goal of this study is to determine the ratios of surface type upon the Si sample. Data is collected from the Si samples using SPALEED. By analyzing the data from dates where combined surfaces are present it is possible to determine the amount of certain types of surfaces present on the sample. The ultimate goal is the ability to control the growth of Pb islands upon the Si crystal. Applications of this research include the design of advanced microprocessors and quantum wires. Introduction: The goal of the REU project to which I was assigned is to determine the amounts of certain types of crystalline surface structures present upon the Si crystal that had been used in previous experiments involving the formation of Pb islands at low temperature. This is accomplished by analyzing certain aspects of the data collected by Spot Profile Analysis Low Energy Electron Diffraction (SPALEED). The data sets are taken from different experimental runs involving various surfaces and are compared to one another. These surfaces include combined types of surface structures as well as those with only a single surface structure present. Background and Experimental Procedure: Within ultra-high vacuum and at very low temperature, a Si crystal is placed. This crystal is heated by use of a tungsten filament to high temperatures in order to eliminate impurities. The Si is then heated again at certain temperatures and for specific durations of time in order to create particular crystalline surface structures. Atoms of Pb are then deposited upon the Si crystal by a process of evaporation. The amount of Pb deposited is known and is measured in terms of monolayers, or layers of Pb upon the surface measu... ...is known through previous experiments that the surface of the Si upon which the Pb is deposited can change the height of the Pb islands formed. By altering the silicon surface upon which the Pb is deposited it is hoped that the Pb islands can be controlled. The hope is that the work here can help pave the way for computer chip architecture in the next fifty years. If the Pb islands can be deposited evenly and placed in specific locations it is believed that they can be use as quantum wires, dramatically increasing the speed of the silicon chip computer. At this time the data is promising. With more data and further analysis the problems of controllable Pb island formation are sure to be solved. The use of Scanning Tunneling Microscopy and SPA-LEED are the keys to unlocking the mysteries of the Si surface and it’s connection to the formation of the Pb islands.

Physics for Future Presidents Notes-Final Exam

Energy: the ability to do work. Work= force x displacement. Power=energy/time Power is measured in watts or horsepower. Joules/sec=watts 1hp=746w=1kw Basal metabolic rate 2000kcal/day= 100w Batteries store energy in chemical form. They release energy by pumping electrons’ through wires from the minus pole to the plus pole. Devices inbetween convert this energy to another form, Efficieny- e. motor=85%, combustion= 20% Hydrogen is not a source of energy but a means of transportation Types of energy: kinetic e(in joules)= . 5mv^2.Solar energy- 1gw per km^2 Solar energy can be turned into electricity through solar cells 15%=cheap, 40% efficiency=expensive. Caloric theory of heat=caloric fluid flows from hot object to cold. Heat engine= device to turn heat energy into useful work: heat comes from something hot but only some goes to useful work. Satellites=free fall. Ionizing radiation=energy in the form of waves or paricle Beta radiation-just an electron, wont go through skin but r eally bad inside you alpha- he2+ nucleus-wont go through skin but bad once inside. Comes from radioactive particles like lead 210 or iodine. amma- high energy photon, may go through you. neutrineos-noninteracting, come from fusion, cosmic rays-very powerful. Come from supernovas. Moves at speed of light moderator-slows neutrons b/c they are absorbed better when slow ciritical mass needed for nuclear bomb-5kg, resistence of wire depends on length, longer=more resistance. Thickness-thinner=bigger resistance, material. Escape velocity=velocity required on the surface to completely leave a planet Rcket-goes nowhere near escape velocity – drag from atmosphere is bad, goes slower but carries fuel Tin Celsius = Tin Fahrenheit ? 2 ? 5 9 Tin Fahrenheit = Tin Celsius ? 9 + 32 . 5 Nuclear energy Source of energy of energy in plants=radioactive particles such as uranium and plutonium. A chain reaction is the doubling law that takes you from small numbers to high numbers in a small number of generations. Aromic bombs are based on chain reactions of u-235 or pu-239. Plutonium is manufactured in nuclear reactors. Difficult bomb design (implosion). Hydrogen bomb=fission ignites secondary reaction that contains two isotopes of hydrogen-most dangerous part of residual radioactivity.Nuclear reactors are based the chain reaction but normally work with neutron multiplication of 1 o reaction doesn’t grow. Moderators slow neutrons so they are more likely to attract to nucleus. If moderator is lost the chain reaction stops. If it runs away and c. r. begins to grow exponentially, the slowness of the neutrons limits the size of the explosion. Since a c. r. depends on slow neutronsa cr that depends on slow neutrons cannot give rise to a nuclear explosion so therefore a reactor cannot blow up like a bomb b/c when temp increases, aroms are moving too fast for the neutrons to hit them so the c. stops. It will blow up like tnt, but 1 mil times smaller than a bomb. N reactor= d evice in which sustained c. r. takes place. Neutrons hit nucleus to cause another fusion. Power doesn’t grow, is constant. Power comes out in the form of hear. Nuclear reactors use moderators- a chemical mixed with fuel that slows down the neutrons. Isotopes are different types of atoms (nuclides) of the same chemical element, each having a different number of neutrons. Power-rate of energy release. Cookies=high energy. Tnt=high power. I kg h=1 gal gas.Heat energy (or just heat) is a form of energy which transfers among particles in a substance (or system) by means of kinetic energy of those particle. Nuclear energy= energy stored between the forces between parts of atomic nucleus. Energy=measured in calories or joules. I watt-I joule/sec. most useful kinds of energy=chemical and potential. One calor is the enrgy it takes to raise one kg of water by one degree Celsius. 4k joules=calories. Solar cells- crystals that convert sunlight directly into electricity. K energy depends on sq of v. double speed=kinetic energy increased by factor of 4.. emp is a measure of hidden kinetic energy. Disorider= entropy. Double abs temp=double pressure. Heat engine= any engine that runs by turning heat into mechanic motion. Laws: 0-objects in contact tend to reach same temp. 1- energy is conserved. 2-you can’t extract heat energy w/o temp difference- tend towards same temp 3-nothng can reach temp of abs 0. Satellite in low earth orbit=5 mi/sec. high sat=slow. Geosynchrous sat= sat that orbites in 24 hours. . blackhole=escape velocity = faster than speed of light. Big mass or lots packed into small radius . rockets fly by pushing burned fuel down. /c rocket weighs so much more fuel, the amount of velocity gained by rocket is much less than the fuel velocity so very inefficient. Gravity=attraction between two masses. Radioactivity= explosion of nucleus atom. Radiation=pieces thrown out in explosion.. chernyobyl-vessel explosded in Ukraine, radiation went all the way to stockhom. Don’t know if deaths were from radiation or regular cancer. Firefighters died from radiation45 rem receved average.. 25 rem=1% cancer chance. The hydrogen economy is a proposed system of delivering energy using hydrogen.Thinks methane is the way since ch4. he term â€Å"hydrogen economy† describes an envisioned large-scale scheme of delivering energy by means of hydrogen, particularly for â€Å"motive power† (personal cars, buses, planes, ships, etc. ). This is attractive for several reasons, among them the clean way in which hydrogen burns (it only leaves water as a residue), its high energy per weight, and the fact that fuel cells can convert hydrogen’s energy directly into electricity that subsequently powers an electric motor, with a combined efficiency exceeding that of ordinary combustion engines.Around 4:00 am on the morning of March 28, 1979, water pumps in the non-nuclear section of Three Mile Islands’ Unit 2 nuclear power pla nt stopped working. This prevented the steam generators from removing heat from the plant and initiated an automatic shutdown of the reactor. The possiblity that the melting of fuel rods could result in a release of radioactivity to the surroundings was of great concern. The Nuclear Regulatory Commission was alerted at 8:00 am and the White House was alerted at 9:15 am. By 11:00 am, all non-essential personnel were evacuated from the facility.The remaining personnel worked to bring the situation under control over the next several days. According to the U. S. Nuclear Regulatory Commission, this accident, â€Å"was the most serious in U. S. com- mercial power plant operating history, even though it led to no deaths or injuries to plant workers or members of the nearby community. But it brought sweeping changes involving emergency response plan- ning, reactor operator training, human factors engineering, radiation protection, and many other areas of nuclear power plant operations. â €  – melted cre

Free Essays on Self-evident In The Declaration Of Independence

In the â€Å"Declaration of Independence,† Thomas Jefferson uses the phrase â€Å"self-evident† as a necessary modifier for the truths of equality he describes that all men are created equal and that they are endowed with certain unalienable rights. The inclusion of this phrase has a profound effect on Jefferson’s argument for freedom because of what it represents. In the original draft of the â€Å"Declaration of Independence,† it’s obvious that the phrase sacred and undeniable is crossed out and substituted with â€Å"self-evident† (2). Much has been said about Jefferson’s purpose for including the phrase â€Å"self-evident†: to justify American independence in the plainest terms, to place a stronger emphasis on the scientific logic behind equality [by removing the word sacred] or to signify the merging of religious ideals with human reason. Whatever the reason, Jefferson uses it to â€Å"command the attention and assent† of the tyrannical King of England, once arguing that the colonists were â€Å"a free people claiming their rights as derived from the laws of nature, and not as the gift of their Chief Magistrate† (1). â€Å"Self-evident† brings validity to the basic truth of universal freedom as it is based on the laws of nature. For Jefferson and his contemporaries, the phrase â€Å"self-evident† characterizes a new way of thinking, and is an expression of â€Å"the philosophy of the natural rights of people in an age when absolute monarchs ruled throughout the world† (1). During this time, Jefferson is a philosopher and supporter of the eighteenth-century Enlightenment, â€Å"which saw humanity emerging from the dark ages of superstition toward a more rational and humane future† (3). Further, it is a phrase with a scientific origin, with Rene Descartes having introduced its importance in relation to science (4). The phrase â€Å"self-evident† merely reflects the moral, philosophical and newly adapted scientific ideas of... Free Essays on Self-evident In The Declaration Of Independence Free Essays on Self-evident In The Declaration Of Independence In the â€Å"Declaration of Independence,† Thomas Jefferson uses the phrase â€Å"self-evident† as a necessary modifier for the truths of equality he describes that all men are created equal and that they are endowed with certain unalienable rights. The inclusion of this phrase has a profound effect on Jefferson’s argument for freedom because of what it represents. In the original draft of the â€Å"Declaration of Independence,† it’s obvious that the phrase sacred and undeniable is crossed out and substituted with â€Å"self-evident† (2). Much has been said about Jefferson’s purpose for including the phrase â€Å"self-evident†: to justify American independence in the plainest terms, to place a stronger emphasis on the scientific logic behind equality [by removing the word sacred] or to signify the merging of religious ideals with human reason. Whatever the reason, Jefferson uses it to â€Å"command the attention and assent† of the tyrannical King of England, once arguing that the colonists were â€Å"a free people claiming their rights as derived from the laws of nature, and not as the gift of their Chief Magistrate† (1). â€Å"Self-evident† brings validity to the basic truth of universal freedom as it is based on the laws of nature. For Jefferson and his contemporaries, the phrase â€Å"self-evident† characterizes a new way of thinking, and is an expression of â€Å"the philosophy of the natural rights of people in an age when absolute monarchs ruled throughout the world† (1). During this time, Jefferson is a philosopher and supporter of the eighteenth-century Enlightenment, â€Å"which saw humanity emerging from the dark ages of superstition toward a more rational and humane future† (3). Further, it is a phrase with a scientific origin, with Rene Descartes having introduced its importance in relation to science (4). The phrase â€Å"self-evident† merely reflects the moral, philosophical and newly adapted scientific ideas of...

Free Essays on Fredrick Douglas

Society can be viewed from many different perspectives. During the 1800’s, two people could live under the very same constitution but have completely different outlooks on how effectively the government worked. In â€Å"Narrative of the Life of Frederick Douglass†, this former slave describes his experience growing up as a Negro in America. He portrays what life was like as a piece of property and tells his own interpretation of freedom. His point of view of freedom clearly differs from what the founding fathers thought it to be. Since Frederick was deprived of so much as a child, his picture of freedom is much more elemental and primitive to that of a wealthy white man. Due to his poor misfortune, Frederick looks at life from a different angle than the average man. In this story, Frederick realizes how he is unique from other people and uses this knowledge to fight for his own personal freedom. Frederick knew he was a slave, but he did not always understand his ill-fated destiny and how to get himself out of that trap. In the story, an epiphany is used when he realizes who he is. An epiphany is an awakening or a moment of truth, and that is exactly what Frederick experiences. Frederick quotes, â€Å"From that moment, I understood the pathway from slavery to freedom. It was just what I wanted, and I got it at a time when I least expected it†¦Though conscience of the difficulty of learning without a teacher, I set out with high hope, and a fixed purpose, at whatever cost of trouble, to learn how to read.† This is one of the many statements relative to his own awareness. He comes upon the distinct realization that he must learn how to read and write in order to receive other freedoms. He knows that being literate will bring him closer to his dream. He wants the shackles of slavery literally and metaphorically removed from him, but he must learn how to read f irst. In addition to that quote, there are many other times in t... Free Essays on Fredrick Douglas Free Essays on Fredrick Douglas Society can be viewed from many different perspectives. During the 1800’s, two people could live under the very same constitution but have completely different outlooks on how effectively the government worked. In â€Å"Narrative of the Life of Frederick Douglass†, this former slave describes his experience growing up as a Negro in America. He portrays what life was like as a piece of property and tells his own interpretation of freedom. His point of view of freedom clearly differs from what the founding fathers thought it to be. Since Frederick was deprived of so much as a child, his picture of freedom is much more elemental and primitive to that of a wealthy white man. Due to his poor misfortune, Frederick looks at life from a different angle than the average man. In this story, Frederick realizes how he is unique from other people and uses this knowledge to fight for his own personal freedom. Frederick knew he was a slave, but he did not always understand his ill-fated destiny and how to get himself out of that trap. In the story, an epiphany is used when he realizes who he is. An epiphany is an awakening or a moment of truth, and that is exactly what Frederick experiences. Frederick quotes, â€Å"From that moment, I understood the pathway from slavery to freedom. It was just what I wanted, and I got it at a time when I least expected it†¦Though conscience of the difficulty of learning without a teacher, I set out with high hope, and a fixed purpose, at whatever cost of trouble, to learn how to read.† This is one of the many statements relative to his own awareness. He comes upon the distinct realization that he must learn how to read and write in order to receive other freedoms. He knows that being literate will bring him closer to his dream. He wants the shackles of slavery literally and metaphorically removed from him, but he must learn how to read f irst. In addition to that quote, there are many other times in t...

Euthanasia effectiveness and weakness Literature review

Euthanasia effectiveness and weakness - Literature review Example Euthanasia and/or assisted suicide is a criminal offence in almost all countries throughout the world, however recently various countries have started to open up to consider the other side of the argument, and taken steps to legalize the process. Countries such as The Netherlands, Switzerland, Luxemburg, Belgium and Canada1 are cases in point. Opponents argue that voluntary euthanasia is not equivalent to murder and that it is in fact merciful since it helps those suffering from acute illness and pain. Opponents on the other hand including human rights groups and religious leaders argue that killing is against the will of god and an inhuman act and hence must not be endorsed. CBC News (2013). Quebec to proceed with dying with dignity legislation [Online] Available at: http://www.cbc.ca/news/canada/montreal/story/2013/01/15/montreal-dying-with-dignity.html [Accessed: March 13, 2013] USA Today (2012). Deaf Belgian twins going blind choose to be euthanized [Online] Available at: http://www.usatoday.com/story/news/world/2013/01/14/deaf-belgian-twins-going-blind-euthanized/1834199/ [Accessed: March 14, 2013] The Guardian (2009). Debbie Purdy wins significant legal victory on assisted suicide [Online] Available at: http://www.guardian.co.uk/society/2009/jul/30/debbie-purdy-assisted-suicide-legal-victory [Accessed: March 13,

Nursing Assessment and Care of a Patient Following a CVA Essay

Nursing Assessment and Care of a Patient Following a CVA - Essay Example He has not passed urine since admission. He exhibits some paresis, and is leaking saliva at the right side of his mouth. Two possible nursing diagnosis related to this patient’s condition include: Risk for aspiration related to impaired swallowing secondary to cerebrovascular accident; Risk for falls related to bodily weakness, secondary to CVA. This paper shall discuss the patient’s assessment data and interventions which can be implemented for the patient. Body Assessment 1: Risk for aspiration related to impaired swallowing secondary to cerebrovascular accident. This nursing diagnosis relates to this patient’s assessment data because the patient’s swallowing reflex is compromised and he is also unable to control his saliva flow into his tracheobronchial passages. As a result, his saliva getting into his bronchial tubes and on to his lungs is a significant possibility. Two priority nursing interventions to address the problem includes: clear secretions f rom the mouth or throat with a tissue of gentle suction; and maintain side-lying position. Clear secretions from the mouth or throat with a tissue of gentle suction This intervention would involve the regular checking of the patient’s mouth for saliva build-up, clearing such build-up with a tissue or via gentle suction. Preventing saliva build-up in the mouth prevents the saliva from flowing down the throat and into the bronchial tubes and lungs, thereby preventing aspiration (Carpenito-Moyet, 2008). Moreover, cleaning of the oral cavity would also help prevent the build-up of bacteria. Since the patient manifests right-sided hemiparesis, there is a need to assist the patient in controlling the saliva flow, and prevent such from flowing unconsciously down his throat. Cleaning and suctioning the mouth is suitable because it can easily reduce saliva flow and it can be managed well as an independent nursing intervention by the nurse (Carpenito-Moyet, 2008). Cleaning and suctioni ng the patient’s mouth would also prevent bacteria build-up and prevent any additional health issues, like aspiration pneumonia, which may arise from the patient’s current condition. Suctioning may however also promote dryness in the patient’s mouth, therefore, the suctioning must not be excessive. Suctioning may also cause oral and throat irritation. If not properly and carried out under sterile conditions, it may promote bacteria build-up (Carpenito-Moyet, 2008). Suctioning must therefore be carried out gently and with the proper application of sterile techniques. The application of suctioning among patients whose swallowing reflexes have been compromises has been proven an effective practice by various researches. In a paper by Coffman, et.al., (2007) the authors sought to investigate the benefits of using cuffed tracheotomy tubes in order to suction patient’s saliva. The authors were able to establish a significant decrease in aspirate with the use of intermittent suction. In effect, the authors concluded that the use of suctions can reduce the risk of aspiration and therefore reduce the patient’s risk for aspiration. This was also echoed in the study by Yoon and Steele (2007), where the authors highlighted the fact that proper oral care is an effective way of reducing incidents of aspiration pneumonia and bacterial colonization in the mouth. Evaluation criteria to establish efficacy of the intervention is