The Basics of Aramid Fiber, Polymer Reinforcing Fiber

Aramid fiber is the generic name of a group of synthetic fibers. The fibers offer a set of properties which make them particularly useful in armor, clothing and a wide range of other applications. The most commonly known commercial brand is Kevlarâ„ ¢, but there others such as Twaronâ„ ¢ and Nomexâ„ ¢ in the same broad family. History Aramids have evolved out of research which stretches back to nylon and polyester. The family is known as aromatic polyamides. Nomex was developed in the early 1960’s and its properties led to wide use in protective clothing, insulation and as a replacement for asbestos. Further research with this meta-aramid led to the fiber we now know as Kevlar. Kevlar and Twaron are para-aramids. Kevlar was developed and trademarked by DuPont and became commercially available in 1973. 2011 worldwide production of Aramids was well over 60,000 tons, and demand is growing steadily as production scales up, costs fall and applications broaden. Properties The chemical structure of the chain molecules is such that the bonds are aligned (for the most part) along the fiber axis, giving them outstanding strength, flexibility and abrasion tolerance. With outstanding resistance to heat and low flammability, they are unusual in that they do not melt – they merely start to degrade (at about 500 degrees Centigrade). They also have very low electrical conductivity making them ideal electrical insulators. With high resistance to organic solvents, the all-around ‘inert’ aspects of these materials offer outstanding versatility for a huge range of applications. The only blot on their horizons is that they are sensitive to UV, acids, and salts. They build static electricity too unless they are specially treated. The outstanding properties which these fibers enjoy provide advantages which make them ideal for a wide range of applications. However, with any composite material, it is important to take care in  handling  and processing. Using gloves, masks, etc. is advisable. Applications Kevlar’s original use was for car tire reinforcement, where the technology still dominates, but in transport, the fibers are used as a replacement for asbestos – for example in brake linings. Probably the most widely known application is in body armor, but other protective uses include fireproof suits for firefighters, helmets, and gloves. Their high strength/weight ratio makes them attractive for use as reinforcing (for example in composite materials particularly where flexing tolerance is important, such as aircraft wings). In construction, we have fiber-reinforced concrete and thermoplastic pipes. Corrosion is a major problem for expensive undersea pipelines in the oil industry, and thermoplastic pipe technology was developed to prolong pipeline life and reduce maintenance costs. Their low stretch properties (typically 3.5% at break), high strength and abrasion resistance make aramid fibers ideal for ropes and cables, and they are even used for mooring ships. In the sporting arena, bowstrings, tennis racquet strings, hockey sticks, skis and running shoes are some of the application areas for these outstanding fibers, with sailors enjoying the benefits of aramid-reinforced hulls, aramid lines and Kevlar wear-patches on their elbows, knees, and rears! Even in the music world aramid fibers are making themselves heard as instrument reeds and drumheads, with the sound being relayed through aramid-fiber loudspeaker cones. The Future New applications are being announced regularly, for example, a high-performance protective coating for harsh environments which embeds Kevlar fibers in an ester. This is ideal for coating new steel pipelines – for example in utilities where water pipes may bury underground and budgets do not permit the more expensive thermoplastic alternatives. With improved epoxies and other resins being introduced on a regular basis and given the continuous scaling up in worldwide production of aramids in many forms (fiber, pulp, powder, chopped fiber and woven mat) the increased use of the material is guaranteed both in its raw form and in composites.

Biological Determinism And Social And Economic Differences...

Question 1. Biological determinism as stated by Gould, states â€Å"that shared behavioral norms, and the social and economic differences between human groups-primarily races, classes, and sexes-arise from inherited, inborn distinctions and that society, in this sense, is an accurate reflection of biology† (Gould, p.52). He explains this idea further through his explanation of how biological determinism can be measured or assigned based on the craniometry, which is the size of the skull, for at the time it was believed that the larger the skull, the more intelligent that individual was. This explanation became one of the earliest works connected to scientific racism. Gould, believed that during this time many scientists used their own prejudices, and bias’s when concluding their research, such as the work of French anthropologist, Paul Broca, who stated that â€Å"the small brains of women† concluded that men were to be regarded as more intelligent, as well as, a bove women, however, although women did prove this prejudice to be wrong with â€Å"their talents and their diplomas†, they were still â€Å"opposed by numbers† (Gould, p. 58). â€Å"Biological determinism is, in its essence, a theory of limits† for it states that people who are at the bottom are basically biologically inferior, which is reflected in their social status (Gould, p. 60). Both Darwin and Mendel contributed to biological determinism and scientific racism, is that both opened the doors to new anthropological scientificShow MoreRelatedBiological Determinism, Subculture Crime And Conflict Theories1652 Words   |  7 Pagescrime which culminated in his conviction for murder are; biological determinism, ecological determinism, subculture crime and conflict theories. Biological determinism One of the best known application of biological determinism in relation to crime is from Cesare Lombroso who â€Å"Viewed criminals as suffering from a depravity caused by an atavistic reversion:† In other words, through a regression to the early form of life found in Humans ape-like ancestors. â€Å"Lombroso believed that if a person hadRead MoreWhat Are The Four Primary Types Of Human Adaptation?1685 Words   |  7 PagesChapter 1. 4. What are the four primary types of human adaptation? Why has their interrelationship been particularly important for the human species? Anthropology recognizes four primary types of human adaptation: genetic change, developmental adjustment, acclimatization and cultural adaptation. Individuals may develop a successful adaptation with the help of biological evolution. i.e. genetic change, that is caused by the constant environmental stress, experienced by many generations. It is a well-knownRead MoreGender Equality Is a Myth3679 Words   |  15 Pagesillustrate that the differences that continue to exist between men and women are only socially, and culturally fabricated. The great enemy of truth is very often not the lie --deliberate, contrived and dishonest --- but the myth --persistent, persuasive and unrealistic. (John F. Kennedy) The usage of gender The general usage of the term gender is relatively new. It increasingly became a buzz word in the late 1960s and 1970s, and became fashionable in professional disciplines such as the social sciences.Read MoreEssay about Does History Have an End?1045 Words   |  5 P agesinherited from his philosophical father, Hegel, the idea of historical progress (.a href=http://www.gradesaver.com/ClassicNotes/Authors/about_karl_marx.htmlhttp://www.gradesaver.com/ClassicNotes/Authors/about_karl_marx.html/a). Both believed that human history unfolds according to a distinct series of historical stages, each following the other. These stages ultimately lead to a prearranged Utopian endpoint, after which there will be no more change and an end to history. Unlike Hegel, though, MarxRead MoreSexual Orientation : Sex And Gender1783 Words   |  8 Pagesdemonstrate that other cultures conceptualize human sexual desires in ways different from ours. They might point out that homosexuality takes many different forms in different cultures or that many cultures lack anything like our categories of sexual orientation. The existence of a wide range of cultural variation is supposed to show that sexual orientations do not exist in other cultures and thus that it is a mistak e to think sexual orientations are natural human kinds. The argument from cultural variationRead MoreA Male Dominant Society1816 Words   |  7 Pagesreference to Autocratic rule by the male of a family or a group, however in modern times the term is used in reference to a social system where the adult male is in the position of power in the family and the role of the women is just to support the decisions of the male (Gordon 1996). Over the years different theories and perspectives have been used to evaluate the system of patriarchy, these theories provide different perspectives on the social understanding of this system. Feminist Theory When seenRead MoreQuestions On Meeting On Monday2681 Words   |  11 Pages spatial organization, and regional distributions.† (Heckenberger, PG 324). Heckenberger makes it clear that despite the diversity of the Xinguanos due to their permeable spatial boundaries, there is a distinct connection that links to the Arawak groups through the regional cultures (Heckenberger, PG 49). The Arawak diaspora ultimately began in the Xingu basin, and as it spread outwards, it culturally shaped the Xinguanos. 2A. According to Heckenberger, how long has the society he is analyzingRead MoreThe Discipline Of Cultural Anthropology3459 Words   |  14 Pagescultural anthropology falls into the idea that culture everywhere is our lives impacts every aspect of our human lives. â€Å"Anthropology is the scientific study of human beings-that is, human creature viewed in the abstract: male, female, all colors and shapes, pre-historic, ancient, and modern. Many cultural anthropologists come to believe that the idea of our past and present societies, from the social and cultural structure of them, to the religion and language, as well as the symbols of that society allRead MoreHow do Differential Association Theories best Demonstrate that Criminal Behaviour is a ‘Learned Behaviour’1007 Words   |  5 Pagescontribution to criminology, similar in importance to strain theory and social control theory. These theories all explain deviance in terms of the individual’s social relatio nship. Sutherland’s theory make tracks from the pathological perspective and biological perspective by features the cause of crime to the social context of individuals. â€Å"He rejected biological determinism and the extreme individualism of psychiatry, as well as economic explanation of crime. His search for alternative understanding ofRead MoreThe Fairness And Lack Of Fairness1634 Words   |  7 Pagesis about fairness, making sure all people get access and chances to the same opportunities. This is because many of our differences, our pasts and our views can lead to a blockade of participation, singling certain people out. To ensure that equality is achieved it must first insure equity. Throughout many institutions of education social inequity has been shown through social class, race and ethnicity and gender. As of this many minorities and certain people have been caused to feel an unjust service

B. F. Skinner and Behavior Conditioning Free Essays

Behavior conditioning is viewed as a significant psychopathological influence that extends beyond the concept of psychoanalysis and sexual psychology. Burrhus Frederic Skinner (1904-1990) considers the concept of conditioning as comprehensive type of learning wherein behavioral changes are manipulated rather than intrinsically stimulated. According to the article of Moore (2002), behavior conditioning of Skinner gives rise to two primary components: (1) the biological foundation of behavior manipulation through hormonal systems and other physiologic relations (e. We will write a custom essay sample on B. F. Skinner and Behavior Conditioning or any similar topic only for you Order Now g. neurologic functioning, genetic relationships, etc. ), and (2) the occurrence of the behavioral event. Behavior conditioning is the indirect manipulation of activities in order to elicit a behavioral response or behavioral pattern. B. F. Skinner’s idea of behavior conditioning revolves in his concept of Operant Conditioning, which is a type of learning process wherein stimulation of behaviors illicit behavioral modifications. According to the article of O’Donohue and Plaud (1994), Skinner’s behavioral conditioning involves a mutual relationship between the strengthening and weakening effects rendered by environmental consequences. The mutual relationship between (1) reinforcement and (2) punishment is directed by a stimulus control. According to B. F. Skinner, â€Å"human behavior is not a simple machine-like product of a stimulus, but is something dynamic, changing and in flux, as the environment is in influx†. Behavior conditioning of B. F. Skinner, indeed, constitutes environmental reinforcements and punishments that set the behavioral trends of a human being. Discussion Behavioral Conditioning The psychological activities fostering behavior in an individual are said to be dynamic, ever changing and mutually linked with the external forces of the human environment. Skinner has observed early on that a large part of our behavior is not automatically elicited by an unconditioned stimulus. According to Moore (2002), the concept of behavioral conditioning is associated to the process of survival wherein a human being is directed to a specific pattern of behavior in order to foster adaptation towards the changing environment. Skinner’s operant conditioning can be viewed as a diverse behavioral process that evolves and influences the individual’s survival during its lifetime by facilitating the adaptation towards the environment (Moore, 2002). The consequence behavior is the result of the individual’s way of adaptation towards the environment. In the process of the individual’s adaptation, the â€Å"environment in turn acts back on the behavior and on the individual: both are changed as a result of reciprocal behavior-environment interchange (Skinner, 1953)†. According to Burgess (1997), Skinner’s idea of behavior conditioning comprises of three perceivable components that explain to the process of behavioral modification. These elements are (1) the inner activities of behavior, (2) nature of inner behavior, and (3) the role of the environment. Inner activities include the cognitive processes and activities (e. g. thinking, problem solving, decision-making, etc. ) that an individual performs prior to the adaptation of behavior. Meanwhile, the nature of inner behavior is assessed whether the individual’s behavioral change is due to the evolution of society or external environment (phylogenetic) or genetically acquired (ontogenetic). Lastly, the environment facilitates the learning atmosphere that reinforces the permanent change of behavior in the individual (Burgess, 1997). In application of this theoretical proposition, the behavioral transformation of 12-year old that initiates a bullying behavior at school is first established by an inner assessment of self and environment. The child analyzes the capacity of his strength over the others in the class, and then further internalizes the nature of his preferred action. Reinforcers of this behavior can either be other classmates influencing him to bully others or his intrinsic psychological desire to bully others. In a well-appropriate environment where the subject is regarded as the strongest, the chance of producing a bullying behavior to 12-year old boy is more likely (Burgess, 1997; O’ Donohue and Plaud 1994). As for the analysis above, behavior conditioning is therefore affected by three major components, namely (1) the inner self, (2) the environment and (3) the process of behavioral adaptation. However, according to Moore (2002), another contributing factor to consider is the biological foundation of behavior. In Moore’s (2002) argument derived from Skinner’s behavioral conditioning, the influence of hormonal and genetic compositions is another perspective of behavior modifications. â€Å"The science of behavior is concerned with behavior directly selected according to phylogenic contingencies, via inherited genetic mechanisms (Moore 2002)†. The contributions of genetics to causal behavioral events are said to be due to the sensitivity of nervous function to environmental stimulation. Skinner suggests that some behaviors dominating in an individual are not externally fostered, rather elicited only by the environment or other forms of reinforcements (Moore 2002). Components of Behavior Conditioning B. F. Skinner’s view of behavioral conditioning comprises of diverse factors, specifically (1) the material environment during the lifetime of the individual organism (Moore 2002), (2) inner activities and nature of a behavior – phylogenetic (Moore 2002; Burgess 1997), (3) the Gene-Behavior relationship (Moore 2002), and (4) the reciprocal behavior-environment interchange (O’ Donohue and Plaud 1994). In these four contributing factors of behavior conditioning, Skinner, in his operant conditioning, has proposed two essential balancing components: (1) positive reinforcements (rewards), and (2) negative reinforcements (punishments). Operant conditioning involves the functional relationships between behavior events and environmental events. Consequent behaviors can be demonstrated by systematic and controlled changes in the environment. To Skinner, â€Å"there are three-term contingency that exemplifies the relationship among antecedents, behavior and consequences. † Most activities that human beings perform socially provide the context for other people to react according to these activities in one way or another; thereby, initiating consequences of behavior. Such principle is also true in terms of physical environment through the presence of reinforcements, specifically reward systems and punishments. According to Skinner, â€Å"behavior is governed to some degree by reinforcement, which can be organized in endless variety of ways according to reinforcements and punishments. † In addition by Moore (2002), reinforcements largely depend on the environmental settings and the behavioral nature present in the individual. Negative and positive reinforcements act as the behavior leverages that manipulates an individual’s behavior. According to O’ Donohue and Plaud (1994), behavior conditioning and the basic elements of reinforcements and punishments are defined as the Law of Effect responsible for manipulating both desired and undesired behavioral practices. The main emphasis of behavior modification is to reinforce behaviors that are valuable, and negate those behavioral patterns that are not appropriate. In operant conditioning, the individual’s behavior operates on the environment and determines the occurrence of reinforcements as contingent to the behavioral conditioning. According to Moore (2002), reinforcements are interrelated to the individual’s survival and adaptation. â€Å"Operant conditioning occurs when the probability of a response in the presence of an antecedent stimulus increases because of the prior consequences of the response in the presence of the stimulus in question (Moore 2002)†. Skinner’s view of behavioral conditioning identifies covert, implicit or private events as contributing factors to the mutual relationship between stimuli and the influence on behavior response. Conclusion In conclusion of the study, B. F. Skinner in his idea of behavioral conditioning emphasizes behavior as a consequence of the relationship between environment and behavioral events. Conditioning behaviors is facilitated by manipulating the external reinforcements, specifically reward systems and/or punishments, derived from the different contributing factors. Behavior conditioning revolves in various contributing factors, namely (1) the inner and nature of behavior, (2) physical environment, (3) biochemical processes of behavior, and (4) reciprocal behavior-environment interchange. Consequent behaviors are product of the individual’s adaptation in his environment as a form of survival mechanism. References Jensen, R. , Burgess, H. (1997). Mythmaking: how introductory psychology texts present B. F. Skinner’s analysis of cognition. Journal of Psychological Record, 47, 221-227. Moore, J. (2002). Some Thoughts on the Relation between Behavior Analysis and Behavioral Neuroscience. Journal of Psychological Record, 52, 261-266. O’Donohue, W. , Plaud, J. (1994). The Conditioning of Human Sexual Arousal. Journal of Sexual Behavior, 23, 221-228. How to cite B. F. Skinner and Behavior Conditioning, Papers

Family Essay free essay sample

Bridge to Wiseman’s Cove – Freedom Essay by Callum Powell 8A The phrase to â€Å"set himself free† is used a lot throughout a bridge to Wiseman’s cove, whether it is to do with family issues or just common everyday tasks. Carl is constantly trying to let himself free and sometimes succeeds but other times doesn’t. Some examples are that if he’ll see his mother or every stop looking after his little brother Harley. Throughout â€Å"A bridge Wisemans cove† he goes through a mental journey facing evil family member (usually Beryl) and friends. An example of setting himself free is at the end of the novel where throughout the book where he has been looking after Harley, feeding him, caring for him and most importantly keeping him out of trouble. Such as when Harley is caught stealing from the local store, by the time he gets back to Aunt Beryl’s house she lashes out and threatens to kick Harley out but Carl intervenes and give Beryl some of the money that Sarah gave him earlier on in the book so that she can be kind to Harley. We will write a custom essay sample on Family Essay or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page So by the end of the book when Harley moves in with the Duncan’s. Carl feels a sense of relief and freedom, because he no longer has the responsibility for Harley and he no longer has to worry about him. â€Å"â€Å"When Beryl chains Harley up, Carl finds the courage to confront her at the bowls club where she has been all day playing the pokies. If you’d stayed with him, kept an eye on him, if you cared about him, he wouldn’t get into trouble. † This is another part of the book where Carl â€Å"sets himself free† he finally sets free how much he despises aunt Beryl, she has been mean and cruel to them and trying to find any reason to kick them out. So this is when Carl sets free how he feels and puts his foot down. Another example of setting himself free is also at the end of the book when Carl finds out that whilst on her way home from her ‘holiday’ Kerry died in a bus crash. â€Å"Carl Matt opened up too, letting go and feeling a freedom flood into him †¦ he knew at last that he was alive to feel it† (page 241) this moment was probably one of the biggest revelations for Carl as he finally felt the sense of freedom as he was always wondering when his mum would return or if she would return. So when he finally finds out that his mother had died of course he felt sad and depressed but at the same time he felt closure and freedom as he didn’t have to worry about her or didn’t have to always be thinking of if she will come and pick him up. This is a very important part of the novel as the premise of the book is based on family and love but Carl and Harley don’t have either all they have is each other so when they find out their mum is dead it hits them hard but also sets them free. One last example of letting himself free is whilst Carl is working at Skips barge. Because working on the barge helps Carl get away from all his troubles and more importantly the people that don’t accept him such as Beryl. Whilst working on the barge Carl finds the freedom to try a lot of new things. â€Å"You love that barge, don’t you, Carl? †¦You’re the best thing that could have happened. † Finally people were starting to notice Carl, then he had the freedom to show himself. Throughout the book he was shown as a very shy, lonely and awkward kid who didn’t know many people and didn’t really talk or try to communicate with them. â€Å"Carl shared in†¦the freedom of the bird itself. Elation, freedom. He felt them both† (page 158) in some sense Carl wished that he was the bird so that he could fly away from all of his problems ad just leave them all behind. Although Carl keeps working at the barge by the end of the book he still senses a feel of freedom being away from everyone and having somewhere just to relax and forget all of your troubles. To conclude Carl found many ways to find freedom whether it was mental or emotional freedom. The ways he exampled freedom in the text were standing up to Aunt Beryl for Harleys sack, working at the local barge and finally he having the freedom to stop worrying about is mother as he didn’t know she died on her way back home. So by the end of the novel Carl found the freedom for a lot of things and didn’t regret any of the decisions he made.