Josh Miller Essays - Christianity, Religion, Christian Theology

Josh Miller Dr. Rose World Religions May 10 2017 Describe the development of judaism from a "family" religion during the time of the Patriarchs to a "world" religion. The development of Judaism, religion developed among the ancient Hebrews . Judaism is characterized by a belief in one God who revealed himself to Abraham , Moses , and the Hebrew prophets and by a religious life in accordance with Scriptures and rabbinic traditions. Judaism is the complex situation of a total way of life for the Jewish people, include theology , law, and countless cultural traditions. History of the patriarchs as we now have them are all post-Sinaitic, that is they mean the change in the belief and practice that date from the time of Moses. The Bible reports recent events and activities for essentially religious reasons. The biblical authors believed that the divine company is encountered primarily within history. God's presence is also experienced within the natural kingdom, but the more immediate or intimate disclosure occurs in human actions. Although other ancient communities also perceived a divine presence in his tory, the understanding of the ancient Israelites proved to be the most lasting and influential. It is this particular claimto have experienced God's presence in human events and its subsequent development that is the differentiating factor in Jewish thought. 2. List five early christian heresies and describe why they were declared heresies. Adoptionism, Belief that Jesus was born as a the king of mankind, was very good and that he was adopted later as Son of God by the family of the Spirit on him. Adoptionism was declared heresy at the end of the 2nd century and was rejected by the Synods of Antioch and the First Council of Nicaea , which defined the orthodox doctrine of the Trinity and identified the man Jesus with the eternally begotten Son or Word of God in the Nicene Creed . Monarchianism is a set of beliefs that emphasize God as being one person , in direct contrast to Trinitarianism which defines God as three persons existing as one . An overemphasis on the indivisibility of God (the Father) at the expense of the other persons of the Holy Trinity leading to either Sabellianism (Modalism) or to Adoptionism . Docetism, b elief that Jesus' physical body was an illusion, as was his crucifixion; that is, Jesus only seemed to have a physical body and to physically die, but in reality he was bodiless, a pure spirit, and hence could not physically die. Patripassianism, b elief that the Father and Son are not two distinct persons, and thus God the Father suffered on the cross as Jesus. Sabellianism, b elief that the Father, Son, and Holy Spirit are three characterizations of one God, rather than three distinct persons in one God. 3. Describe some of the main theological understandings of Christian Baptism. Baptism is an act in which a Christian is put in water to symbolize the end of an old way of living, and a new start.The Bible first mentions baptism in its accounts of John the Baptist. This was under the old covenant, when baptism was for the Cancellation of sins. A person that should be baptized is a person who has made a lifetime commitment to follow Jesus, listen the word of God and live a new life is a candidate to be baptized. Such ones are repentant and want to be free from their sin. Though Christianity consists of a hidden life with God, baptism is an outward act in which we state our want to follow Jesus on this inner way. From the very day of Pentecost the Church has celebrated and administered Holy Baptism. Indeed St. Peter declares to the crowd are amazed by his preachings. Repent, and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you shall receive the gift of the Holy Spirit. 4. Compare the theological understandings of the holy communion. Lutheran and Catholic theologians in 1968, Lutherans agreed that the celebration of the Eucharist involves a sacrifice of praise and self-offering that unites the believer with the sacrifice of Christ. At the same time, Catholics

Supporting Children with Language Processing Delays

Supporting Children with Language Processing Delays Once children receive a diagnosis of a language delay or learning disability, they often discover that they have processing delays as well. What does â€Å"processing delay† mean? This term refers to the time it takes for the child to process information from text, from the oral information or to decipher vocabulary. They often have the language skills to comprehend, but require additional time to determine to mean. They tend to have language comprehension ability that is lower than other children have in their age group. Difficulties in processing language have an adverse effect on the student in the classroom, as the information coming to the child is often at a greater pace than the child is capable of processing. Children with language processing delays are at a greater disadvantage in the classroom setting. How Central Auditory Processing Disorders Differ from Language Processing Disorders The Speech Pathology website states that central auditory processing disorders refer to difficulties processing audible signals that are unrelated to hearing, sensitivity or intellectual impairments. â€Å"Specifically, CAPD refers to limitations in the ongoing transmission, analysis, organization, transformational, elaboration, storage, retrieval, and use of information contained inaudible signals,† the site states. Perceptual, cognitive, and linguistic functions all play a role in such delays. They may make it difficult for children to receive information or in particular, discriminate between the kinds of information they’ve heard. They find it difficult to process information on a continuous basis or to â€Å"filter, sort and combine information at appropriate perceptual and conceptual levels.† Remembering and retaining the information they’ve heard may also prove challenging for children with central auditory processing delays. They have to work to attach meaning to the series of acoustic signals they’re presented within both linguistic and non-linguistic contexts. (ASHA, 1990, pp. 13). Strategies to Help Children with Processing Delays Children with processing delays don’t have to suffer in the classroom. Here are 10 strategies to support the child with language processing delays: When presenting information, make sure you are engaging the child. Establish eye contact.Repeat directions and instructions and have the student repeat them for you.Use concrete materials to support learning concepts.Break your tasks into chunks, especially those requiring auditory attention.Allow additional time for the student to process and recall information.Provide repetition, examples, and encouragement regularly.Be sure children with processing delays understands that they can request clarification at any time; make sure the child is comfortable asking for help.Slow down when you speak and repeat instructions and directions often.Tap into the childs prior knowledge regularly to help the child make meaningful connections.Reduce pressure whenever possible and observe the child as much as possible to ensure that understanding is in check. Always, always be supportive. Fortunately, with early intervention and proper teaching strategies, many of the language processing deficits are reversible. Hopefully, the suggestions above will aid both teachers and parents in eliminating the struggles children with processing delays endure.

All About the French Regular Verb Passer (to Pass)

All About the French Regular Verb 'Passer' ('to Pass') Passer (to pass) is a very common and useful regular -er verb, by far the largest group of verbs in the French language. It may be used as a transitive verb that takes a direct object or an intransitive verb, and in doing so, its  compound tenses  are conjugated with either  avoir  or  Ãƒ ªtre. Intransitive Passer   à ªtre With no direct object, passer means to pass and requires à ªtre in the compound tenses: Le train va passer dans cinq minutes.   The train is going to pass / go past in five minutes.Nous sommes passà ©s devant la porte midi.   We passed by the door at noon When followed by an infinitive, passer means to go / come to do something: Je vais passer te voir demain.   Ill come (by to) see you tomorrow.Pouvez-vous passer acheter du pain  ?   Can you go buy some bread? Transitive Passer Avoir When passer is transitive and has a direct object, it means to pass, to cross, to go through, and it requires avoir as the auxiliary verb  in the compound tenses. On doit passer la rivià ¨re avant le coucher du soleil.   We need to cross the river before sunset.Il a dà ©j passà © la porte.   He has already gone through the door. Passer is also used transitively with a period of time to mean to spend: Nous allons passer deux semaines en France.   Were going to spend two weeks in FranceJai passà © trois mois sur ce livre.   Ã‚  I spent 3 months on that book Transitive versus Intransitive While the meanings are nearly the same, the difference is in the object (the noun following the verb). If there is no object, or if a preposition separates the verb and object, the verb is intransitive, as in Je suis passà © devant la porte. If theres no preposition, as in Jai passà © la porte, its transitive. Se Passer The pronominal se passer most often means to take place, to happen, or, in reference to time, to go by. Quest-ce qui se passe  ?   Whats going on?Tout sest bien passà ©.   Everything went smoothly.Deux jours se sont passà ©s.   Two days went by. Expressions With Passer With  idiomatic expressions  using the French verb  passer, you can butter someone up,  handcuff someone, kick the bucket, and more. passer   clothing  Ã‚  to slip on/intopasser   infinitive  Ã‚  to go do somethingpasser la douane   to go through customspasser la radio/tà ©là ©   to be on the radio/TVpasser lheure dà ©tà ©Ã‚  Ã‚  to turn the clocks foward, begin daylight saving timepasser lheure dhiver  Ã‚  to turn the clocks back, end daylight saving timepasser pas lents   to pass slowlypasser de bons moments   to have a good timepasser de bouche en bouche   to be rumored aboutpasser des faux billets   to pass forged moneypasser devant Monsieur le maire   to get marriedpasser du coq là ¢ne  Ã‚  to change the subject, make a non sequiturpasser en courant   to run pastpasser en revue   to list; to go over in ones mind, go through  (figurative)  passer (en)   ordinal number  Ã‚  to put in ___ gearpasser là ¢ge de   to be too old forpasser larme gauche  (familiar)  Ã‚  to kick the bucketpasser la journà ©e/soirà ©e   to spend the day/eveningpasser la main d ans le dos quelquun   to butter someone uppasser la tà ªte la porte   to poke ones head around the door passer le cap   to get past the worst, turn the corner, get over the hurdlepasser le cap des 40 ans   to turn 40passer le poteau   to cross the finish linepasser les bornes   to go too farpasser les menottes quelquun   to handcuff someonepasser par   to go through (an experience or intermediary)passer par de dures à ©preuves   to go through some rough timespasser par toutes les couleurs de larc-en-ciel   to blush to the roots of ones hair, to turn pale (from fear)passer par luniversità ©   to go through collegepasser pour   to take for, be taken forpasser quelque chose quelquun   to pass/hand something to someonepasser quelque chose aux/par profits et pertes   to write something off (as a loss)passer quelque chose en fraude   to smuggle somethingpasser quelque chose sous silence   to pass something over in silencepasser quelquun tabac   to beat someone uppasser quelquun par les armes   to shoot someone by firing squadpasser sa colà ¨re sur quelqu un   to take out ones anger on someone passer sa mauvaise humeur sur quelquun   to take out ones bad mood on someonepasser sa vie faire   to spend ones life doing Conjugations You can see all the tenses  of passer, both simple and compound,  conjugated elsewhere. For now, below is the present tense to illustrate that passer hews exactly to regular -er conjugation endings.   Present tense: je passetu  passesil passenous  passonsvous  passezils  passent

Financial Risk Essay Example | Topics and Well Written Essays - 2250 words

Financial Risk - Essay Example Both companies have carried out work in Africa, Asia, Australia, the United States and other parts of Europe. The company operates from offices in the UK and Spain and focuses on the development of residential properties. In the UK the company operates from 24 regional offices across England, Scotland and Wales (Taylor Wimpey 2011b). Over the years, the company has built a wide range of properties from one and two-bedroom apartments to five bedroom detached houses. In addition to its UK and Spain construction business Taylor Wimpey also operates two other businesses - Prestoplan and Taylor Wimpey Logistics (TWL). Prestoplan is the company’s timber frame solutions business which allows for the simplification of on-site construction while TWL is its supply chain logistics business that sources materials in bulk from suppliers ‘just in time’ for carrying out construction (Taylor Wimpey 2011c). The industries in which Taylor Wimpey competes include residential constru ction contractors, the construction sector, and residential real estate development (Hovers 2011). The company’s main competitors are Bellway plc which is located in Newcastle Upon Tyne in the UK and The Berkeley Group Holdings plc in Cobham, Surrey. 2.0 Financing Decisions According to Edum-Fotwe et al (1995) the construction industry in the UK has always experienced a high level of insolvencies when compared to other industries. One of the main causes of this is the improper use of cash resources (Chen et al 2010). It is therefore important that regular performance evaluation be carried out in order to determine the strategies to use in order to ensure survival. Financial analysis using a number of ratios therefore becomes important. Liquidity and solvency ratios look at the ability of a firm to pay to meet short-term and longer-term financial commitments as they fall due (BPP 2009). Financing decisions will affect Taylor Wimpey’s financial risk 2.1 Financial risk Ac cording to Holton (2004) risk as it is commonly used refers to both exposure and uncertainty, neither of which can be defined operationally. There are many different types of risk. However, this paper looks at financial risk. Financial risk is the risk that is associated with debt financing. This synonymous with Gabriel and Baker (1980) definition which states that financial risk is ‘the added variability of the net cash flows of the owners of equity that results from the fixed financial obligation associated with debt financing and leasing.’ It also involves the ‘risk of cash insolvency’ and has been extended to include the risk of not being able to fill obligations in relation to prior claims with the cash that the business generates Gabriel and Baker (1980). A firm’s ability to meet its obligations is determined by the level of its fixed obligations as well as its liquid resources (Gabriel and Baker 1980). It is the risk that a company will not be able to meet its financial commitments due to insufficient cash flows. It is the additional risk that shareholders face when debt is used in addition to equity capital. Financial risk arises as a result of various transactions of a financial nature including legal transactions, new projects, mergers and acquisitions, debt financing, and through the activities of management, stakeholders and competitors (Horcher 2005). Financial risks are associated with both short-term and lon

Locke and Descartes source of knowledge Essay Example | Topics and Well Written Essays - 1000 words

Locke and Descartes source of knowledge - Essay Example For this reason, the theory holds that metaphysics, ethics, and math principles are fundamentally true and that physical evidence and proof are not needed to ascertain knowledge. Due to this belief, the rationalism theory is in direct opposition to empiricism. Empiricism, of which Locke is an integral proponent, contends that knowledge can only be obtained via the experience of sense. It emphasizes that evidence and experience, particularly the experience of sense, plays a more fundamental role in idea formation than traditions and innate ideas (Scheibe & Falkenburg 2011). The theory also contends that these traditions also arise due to prior experience through the senses. The theory emphasizes evidence, contending that all theories and hypotheses need to be tested against natural world observations and not simply relying on intuition or reasoning. The empirical theory is a better theory in discussing the source of knowledge because all that man knows has its basis on experience, whi le innate knowledge can be corrected with time following observation. Comparison Locke’s notion in the empiricism theory of an idea was borrowed from, the discussions by Descartes. According to Locke, the mind is the immediate object of understanding, thought, or perception by the mind (Scheibe & Falkenburg 2011). This is similar to what Descartes considers an idea to be, contending that it is what the mind can perceive immediately. Locke also discusses external object qualities, differentiating between secondary and primary qualities. Secondary qualities are explained as those, which are absent in the objects, instead being sensed, or perceived, while primary qualities cannot be separated at any time from the object. This is also similar to Descartes’ distinction using the candle. According to him, one can perceive the duration, substance, and shape of the candle but cannot clearly perceive sound and color, corresponding to primary and secondary qualities by Locke res pectively (Scheibe & Falkenburg 2011). Both Locke and Descartes contend that man is different from other animals and machines. According to Descartes, this is because machines are unable to use signals or words to declare what they know to other machines (Scheibe & Falkenburg 2011). In addition, animals do not have any reasoning in interpreting knowledge. Locke, similarly, claims that animals cannot abstract or come up with general ideas because they cannot utilize words. In their arguments, it is clear to see that they believe animals have no use for knowledge or ideas. Locke and Descartes also discuss the role of free will in gaining knowledge, considering that man’s will can remain free and be directed, as well as the fact that free will in gathering knowledge, being both free and directed, is consistent with man’s ability to err in his ways (Scheibe & Falkenburg 2011). Descartes contends that when a person is inclined to lean to one side, he possesses more free wil l. In addition, he also argues that free will is greater than intellect and knowledge. Locke builds on these arguments by contending that the determination of man by his free will does not restrain his liberty, while also arguing that bad judgments from available knowledge leads to bad choices. Contrast Descartes believes that knowledge

The Crucible Essay Example for Free

The Crucible Essay The Crucible is a story of the many wrongs that come from the town of Salem during 1692. The power that is brought fourth through revenge, deceit, paranoia, and sheer naive ness, is enough to turn the town of Salem, Massachusetts upside down. It results with the death of twenty innocent people and the jailing of hundreds more. The surge of power through the young women of Salem, who had never tasted power before complied with the struggle between good and evil are two main points in the play. Abigail Williams is the main instigator in all of the play. She is the ringleader of all the young women in Salem. The minute she feels or sees a â€Å"spirit† all the other girls miraculously see and feel them too. Abigail has her eyes set on John Proctor and uses the witch-hunt to take his wife out of play. She discovers that with her new found power all she has to do is accuse someone and they can be condemned. Her hatred for Goody Proctor is evident as in her quote to Rev. Parris, â€Å" She hates me, uncle for I would not be her slave. It’s a bitter woman, a lying, cold, sniveling woman, and I will not work for such a woman! (Act 1 PG 11) The power behind the girls accusations is amazingly large, through all their spectral evidence that was taken for by Danforth and Hathorne. â€Å"I tell you straight, Mister—I have seen marvels in this court. I have seen people choked before my eyes by spirits; I have seen them struck by pins and slashed by daggers. I have until this moment not the slightest reason to suspect that the children may be deceiving me. † (Act 3 PG 84) The power these girls got from the court is a monster that is ever present throughout this play. However along with power comes something much worse which is evil. During the correspondence of the Salem Witch Trials there is a presence of a struggle between good and evil the power of the Puritan Lord and the Devil. Some characters including Danforth and Hathorne who believe they are working on behalf of their lord are actually indeed considered two evils of this play, along with the main instigator, Abigail. â€Å"And mark this. Let either of you breathe a word, or the edge of a word, about the other things, and I will come to you in the black of some terrible night and I will bring a pointy reckoning that will shudder you. And you know I can do it; I saw Indians smash my dear parents’ heads on their pillow next to mine, and I have seen some reddish work done at night, and I can make you wish you had never seen the sun go down! † (Act 1 PG 19) Abigail is a true work of evil in this play. She decides to go after Goody Proctor who is a pure Christian woman. Even her husband John Proctor knows that his wrongful misleading with Abigail shouldn’t be brought down upon Elizabeth. â€Å"My wife will never die for me! I will bring your guts into your mouth but that goodness will not die for me! (Act 2 PG 76) Between John Proctor, Elizabeth Proctor, Rev. Hale, and Mary Warren there is a force of good to go against the evil of this play. Even though Mary Warren had originally been accusing people and faking illness in the court, half way through she has a change of heart. She discovers the effect that the other girl’s accusations are having on her town and want to stop it before Goody P roctor is hanged an innocent woman. Just as Rev. Hale was all about witchcraft at the beginning but by the end he had denoused the trials and only stayed to try and save John. Which he wouldn’t succeed at. The struggle is one that is readily very unfair. By the end of the play it is evident that in a way Evil has conquered good. It was an unfair battle, with the high-ranking judges and power of Abby’s words against the farmers and uneducated townspeople of Salem. The Crucible is a teaching of how power gives people a sort of evil and how evil can easily conquer good. These are demonstrated throughout the play. As a message to us all of what power can do in the wrong hands.

Deviance in Society :: essays research papers

Part one of Sutherland and Cressey’s differential association theory explains that criminal behavior is learned. Applying this to Nate and Sam involves explicating their childhood and how they were raised. From a young age both Nate and Sam were conditioned by their father, Big Willie to be aggressive, and that in life you have to take what you want (take home outline). Nate and Sam’s father unknowingly conditioned them in a harsh way that made them susceptible to becoming date rapists. As a result of their aggressive upbringing Nate and Sam must succeed in their group of guy friends, the â€Å"Mac Daddies,† at any cost. Part three of the differential association theory states, the principal part of the learning of criminal behavior occurs within intimate personal groups. Nate and Sam’s criminal behavior was learned in the home. Their father’s philosophy in life of you have to take what you want in life contributed to his children’s deviant identities. Nate and Sam act how they were taught. The motto of the â€Å"Mac Daddies,† â€Å"no rules, just sex,† also influences the boy’s behavior. This motto is significant in how Nate and Sam deal with women. They are going to take what they want using an aggressive style of behavior, because that is what they were taught. Part four of the differential association theory states, when criminal behavior is learned, the learned includes (a) techniques of committing the crime, which are sometimes very complicated, sometimes very simple; (b) the specific direction of motive, drives, rationalizations, and attitudes. Nate and Sam learned to be aggressive and take what you want in life from their father. In order to stay in competition for â€Å"Mac Master† they had to use these techniques. Their competitive background resulted in them becoming date rapists to increase their point totals in their sexual competition. A person becomes delinquent because of an excess of definitions favorable to violation of law over definitions unfavorable to violation of law. Since the boy’s were raised in an environment that taught aggressive behavior without limits as to what one can achieve, the boys, used this behavior in a negative way and became date rapists. The manner in which the boys were raised was negat ive; therefore, criminal behavior was enforced as opposed to neutral or positive behavior. Part six of the differential association theory states, differential associations may vary in frequency, duration, priority, and intensity. In

Toy Story

Name: Karl Dent Instructor: Morgen Thomas SP13: SOC 101 Date: Mar 19, 2013 â€Å"A Toy's Story Observation† When you think about toys the first thing that comes to mind is the joy they gave when you were a kid growing up, and the smile they put on your kid’s face when you see them playing with them on a daily basis. What if toys could talk? What information would they give us? What would they tell us? Recently I set out on a quest to better understand what information I could get just by looking at the toys in my local neighborhood toy store and how they shape the mind of kids from a young age.Unfortunately for me, the day I went to the toy store there were not many people shopping, so this made my research a little harder to complete. I wandered around the store for several hours, going through many different aisles and looking at many different toys. At times I felt like I was being watched; it was so quiet I could hear whispers as if the little action figures were gi ving me the information I needed. By looking at toys as a way of seeing things from a sociological stand point, I can understand why the manufacturers of toys make certain types and what goals they are trying to accomplish.By studying different toys, I started to use them as tools to see the world in a new way and to see how they shape society from both nature and nurture. My views of toys were like sociological imagination; I started to see how contextual our lives are. I then realized our individual identities were only sensible in a social context. But how can you look at toys and figure out how humans behave in our society? The only possible answer I found to my question was sociology. Toys help to form one important aspect of our lives which we come to understand as gender identity.By having toys specific to boys and girls it helps us to understand what it means to be male or female. Understanding gender identity is said to be one of the most important ways we develop who we ar e and where we belong in our society. With many of the toys I observed, I noticed they would have a specific age group on the box, which is known as the functional age symbol. This helps parents understand the expected developmental growth of their child, being able to compare it with the age of the kids on the toy boxes.There was a lot of cooking toys for girls, and a lot of police toys for boys, which illustrated to me gender inequality. These toys present the message that men are dominant and above women. By looking at the boxes they showed boys play an authority figure of catching bad guys and there weren’t any girl cops on any of the police toys that I saw. This led me to believe that they saw women as being weak and not able to go out and be a police officer in the community that they would eventually grow up and be a part of.There were also toys that sent the message that some men were over other men and some women where over other women. G. I. Joe toys are a way of sh owing boys what they should grow up to be, while a princess doll shows a girl that she is expected to be a pretty lady. This is the process of general socialization in our society. While this process starts at birth, it continues throughout our lives by way of the nurturing of kids through toys. Laser tag toys are more group oriented because they require more than one person to play.This then teaches group cohesion, this is where an individual would start learning how to work as a team while playing with other people. Looking at a play house princess set you can see how that particular toy prepares girls for the future role that society would proclaim them to have. Society expects our girls to grow up and be wives, the one who is always back at home taking care of the kids and the house and making dinner for the husband. The differences in toys between girls and boys also create gender inequality.It would lead you to think that girls will grow up doing just domestic jobs and that bo ys will grow up to be cops, soldiers, firefighters, etc. Gender inequality also creates a wage gap for women in our society because it puts male and female with the same potential on an unequal playing field. NBA toys are modeled after real people. They were of James, Bosh, Williams, Durant and Griffin which are all black male players. There were not any female basketball toys; this showed the separation of race, sex, color and gender, and how sports and athletes are seen in American society.By giving athletes the achieved status of celebrity and role model, it enables the toy company to create a new market of toys based on the person and not the sport. By not promoting female sports as much as male sports, we are sending a message that male sports are more dominant than female sports and males are more important than females when it comes to sports. There were not any white basketball toys and this was an appeal by the toy company to get whiter kids involve in basketball so they ca n be famous and one day own their own toy in a toy store.Separating gender by toys can also lead to other things such as stigma and sanction by family, friends and even teachers. A girl playing with a boy toy and doing boy things will be seen as a tom boy and a boy playing with a girl toy will be seen as s sissy. This can cause serious sanction by parents if they are around friends out in public and society will view this as being deviant because they are going against the norm of what is expected from them. Ranking boys above girls is a form of social inequality and relates to the structure of mobility because it brings about what is called social stratification.One set of toys that stood out were the Home Depot toys. They showed white males being builders and taking control of the development of buildings and handling tools. This was showing men as being engineers and future bosses and did not show where girls could do the same jobs as men in the future. By not giving girls the op portunity from a young age to do what they want, we continue to limit the ability of women in our society. Toys are a very important way for kids to develop. This is one of the many ways they learn to start sharing things with each other.Toys help kids to understand their roles and gender. Day-care, pre-kindergarten and kindergarten are very good places for kids to start their venture of learning. This is where individuals and groups get a chance to interact. In this setting, they have the ability to focus on the creation of their personal identity through playing with toys and others. Of particular interest is the relationship between individual action and group pressures. Having this opportunity to be away from their parents and spend time around other kids will help them nderstand what friendship is and learn the difference between boys and girls. We can expand military toys not only to boys but also to girls because women have proven to be just as productive in the military work forces as men. Allowing boys to play with dolls without being sanctioned is a good way of teaching them how to take care of a child and be more loving when they hit adulthood. Making NBA toys for both males and females is a way to promote the WNBA as much as we do for the men and to gain the interest in the sports for more women.Making white NBA toys will show our kids that white basketball players are as good as black. Teaching girls how to work in construction is not a bad thing because women can also be successful engineers and builders. Domestic jobs such as taking care of the kids should be taught to boys and not just girls. Giving girls more access to the things that are normally set aside for boys from an early age and allowing social mobility will allow them to move from one class to another. If we made these changes we could reduce gender inequality in our society between girls and boys.

Polymer Concrete

POLYMER COCNCRETE 1. Introduction Despite being thought of as a modern material, concrete has been in use for hundreds of years. The word concrete comes from the Latin concretus, which means â€Å"mixed together† or compounded. Concrete is an extremely popular structural material due to its low cost and easy fabrication. Concrete is made up of sand or stone, known as aggregate, combined with cement paste to bind it. Aggregate can be of various sizes. It is broadly categorized as fine (commonly sand) and coarse (typically crushed stone or gravel).The greater proportion of concrete is aggregate which is bulky and relatively cheaper than the cement. As much of the constituents of concrete come from stone, it is often thought that concrete has the same qualities and will last forever. Concrete has been called artificial stone, cast stone, reconstructed stone and reconstituted stone. However, concrete must be thought of as a distinct material to stone. It has its own characteristic s in terms of durability, weathering and repair. Concrete is a relatively durable and robust building material, but it can be severely weakened by poor manufacture or a very aggressive environment.A number of historic concrete structures exhibit problems that are related to their date of origin. It is referred that the concrete is porous. The porosity is due to air-voids, water voids or due to the inherent porosity of gel structure itself. On account of the porosity, the strength of concrete is naturally reduced. It is conceived by many research workers that reduction of porosity results in increase of strength of concrete. Therefore, process like vibration, pressure application spinning etc. , have been practiced mainly to reduce porosity.All these methods have been found to be helpful to a great extent, but none of these methods could really help to reduce the water voids and the inherent porosity of gel which is estimated to be about 28%. The impregnation of monomer and subsequen t polymerization is the latest technique adopted to reduce the inherent porosity of the concrete to improve the strength and other properties of concrete. These problems can be solved by application of polymer in concrete construction. A polymer is a large molecule containing hundreds or thousands of atoms formed by combining one, two or occasionally more kinds of small molecule (monomers) into chain r network structures. The main polymer material used in concrete construction are polymer modified concrete and polymer concrete. Polymer modified concrete may be divided into two classes: polymer impregnated concrete and polymer cement concrete. The first is produced by impregnation of pre-cast hardened Portland cement concrete with a monomer that is subsequently converted to solid polymer. To produce the second, part of the cement binder of the concrete mix is replaced by polymer (often in latex form).Both have higher strength, lower water permeability, better resistance to chemicals, and greater freeze-thaw stability than conventional concrete. Polymer concrete (PC), or resin concrete, consists of a polymer binder which may be a thermoplastic but more frequently is a thermosetting polymer, and a mineral filler such as aggregate, gravel and crushed stone. PC has higher strength, greater resistance to chemicals and corrosive agents, lower water absorption and higher freeze-thaw stability than conventional Portland cement concrete.The pioneering work for the development of polymer concrete was taken up by United States Bureau of Reclamation (USBR). The initial exploratory works carried out at the Brookhaven National Laboratory (BNL) in cooperation with USBR and US in Atomic Energy Commission (AEC) revealed great improvement in compressive strength, permeability, impact resistance and abrasion resistance. The development of concrete-polymer composite material is directed at producing a new material by combining the ancient technology of cement concrete with the mod ern technology of polymer chemistry. 2.Types of Polymer Concrete Four types of polymer concrete materials are being developed presently. They are: a) Polymer Concrete (PC) b) Polymer Cement Concrete (PCC) c) Polymer impregnated Concrete (PIC) d) Partially Impregnated and surface coated polymer concrete The composites using polymer can be: polymer concrete (PC), when the binder is a polymer that replaces the cement paste, polymer modified concrete (PMC/ PCC), when the polymer is used near cement, polymer impregnated concrete (PIC), when the cement concrete is treated by soaking and polymerization.These composites have some advantages compared to ordinary cement concrete such as,rapid hardening, high mechanical strengths, chemical resistance, etc. Among the disadvantages is their high cost. The utilization domain of polymer concrete is continuously diversifying: PMC is widely used for floor and bridge overlays; acrylic latex has been used to produce mortars which can be sprayed on arc hitectural finish ; PIC was first widely used in bridge decks, pipes and conduits for aggressive fluids, floor tiles, building cladding, hazardous waste containment, post-tensioned beams and slabs, and stay-in place formwork.Polymer concrete is similar to ordinary cement concrete because it contains fine and coarse aggregates, but the hydraulic binder is totally substituted with a polymer material. The aggregates are bounded together by the polymer matrix. Polymer concrete contains no cement or water. The performances of polymeric concrete depend on the polymer properties, type of filler and aggregates, reinforcing fiber type, curing temperature, components dosage, etc. Polymer binder can be a thermoplastic, but more frequently a thermosetting polymer.The polymers most frequently used are based on four types of monomers or pre polymer system: methyl methacrylate, polyester prepolymerstyrene, epoxyde prepolymer hardener and furfuryl alcohol . The aggregates used in dry state can be s ilicates, quartz, crushed stone, gravel, limestone, calcareous, granite, clay, etc. In the composition can be used also the filler. Different types of fine materials can be used such as: fly ash, silica fume, phosphogyps, cinder, etc. Filler, especially fly ash, can improve the properties of polymer concrete . 3. History †¢ PC was used as early as 1958 in the USA to produce building cladding. Both PC and PCC have been in commercial use since the 1950s †¢ PIC was developed and has been in use since the 1970s †¢ Polymer concrete products have been used for decades in engineering construction like machine foundations, in the building industry for facade products and sanitary parts, in electrical engineering for isolation devices and especially in the chemical industry for all types of ducts due to its favourable properties, especially its corrosion resistance as well as its strength and elasticity †¢ The development of polymer concrete products, mostly pipe, dates b ack to the early 1960`s.The objective was to achieve a substantial increase in resistance to chemical attack †¢ With the development of trenchless technologies (micro-tunneling and pipe jacking) in 1970`s, polymer concrete pipes became popular in sewer systems.As such over the past years, the process of production and manufacturing of polymer concrete products like pipes, manholes and structures have been fundamentally improved †¢ Today it is used for cultured marble for counter tops, lavatories, as repair material, overlays for bridge and floors in sport arenas and stadiums, laboratories, hospitals, factories; also precast PC was used for drains, underground boxes, manholes, acid tanks and cells, tunnel lining, shells, floor tiles, architectural mouldings and machine tools and bases 4.Significance †¢ Depending on the materials employed, PC can develop compressive strengths of the order of 140 MPa within hours or even minutes and is therefore suitable for emergency co ncreting jobs in mines, tunnels, and highways †¢ PCC possess excellent bonding ability to old concrete, and high durability to aggressive solutions; it has therefore been used mainly for overlays in industrial floors, and for rehabilitation of deteriorated bridge decks. In the case of PIC, by effectively sealing the micro-cracks and capillary pores, it is possible to produce a virtually impermeable product which gives an ultimate strength of the same order as that of PC. PIC has been used for the production of high-strength pre-cast products and for improving the durability of bridge deck surfaces †¢ PCC possess excellent bonding ability to old concrete, and high durability to aggressive solutions; it has therefore been used mainly for overlays in industrial floors, and for rehabilitation of deteriorated bridge decks. In the case of PIC, by effectively sealing the micro-cracks and capillary pores, it is possible to produce a virtually impermeable product which gives an ult imate strength of the same order as that of PC. PIC has been used for the production of high-strength pre-cast products and for improving the durability of bridge deck surfaces †¢ Polymer concrete (PC) is a mixture of aggregates with a polymer as the sole binder. To minimize the amount of the expensive binder, it is very important to achieve the maximum possible dry packed density of the aggregate. . Polymer Concrete (PC) Polymer concrete is an aggregate bound with a polymer binder instead of Portland Cement as in conventional concrete. The main technique in producing PC is to minimize void volume in the aggregate mass so as to reduce the quantity of polymer needed for binding the aggregates. This is achieved by properly grading and mixing the aggregates to attain the maximum density and minimum void volume. The graded aggregates are prepacked and vibrated in a mould.Monomer is then diffused up through the aggregates and polymerization is initiated by radiation or chemical mean s. A silane coupling agent is added to the monomer to improve the bond strength between the polymer and the aggregate. In case polyester resins are used no polymerization is required. An important reason for the development of this material is the advantage it offers over conventional concrete where the alkaline Portland cement on curing, forms internal voids. Water can be entrapped in these voids which on freezing can readily cracks the concrete.Also the alkaline Portland cement is easily attacked by chemically aggressive materials which results in rapid deterioration, whereas polymers can be made compact with minimum voids and are hydrophobic and resistant to chemical attack. The strength obtained with PC can be as high as 140 MPa with a short curing period. However, such polymer concretes tend to be brittle and it is reported that dispersion of fiber reinforcement would improve the toughness and tensile strength of the material.The use of fibrous polyester concrete (FPC) in the c ompressive region of reinforced concrete beams provides a high strength, ductile concrete at reasonable cost. Also polyester concretes are visco-elastic in nature and will fail under sustained compressive loading at stress levels greater than 50 per cent of the ultimate strength. Therefore polyester concrete should be considered for structures with a high ratio of live load to dead load and for composite structures in which the polymer concrete may relax during long-term loading.Experiments conducted on FPC composite beams have indicated that they are performance effective when compared to reinforced concrete beam of equal steel reinforcement percentage. Such beams utilize steel in the region of high tensile stress, fibrous polyester concrete (FPC) with its favourable compressive behavior, in the regions of high compressive stress and Portland cement concrete in the regions of relatively low flexural stress. Properties of Polymer Concrete: †¢ Due to good chemical resistance and high initial strength and modulus of elasticity, industrial use of PC has been mainly in overlays and repair jobs. Thermal and creep characteristics of the material are usually not favorable for structural applications of PC. †¢ Polyester concretes are visco-elastic and will fail under a sustained compressive loading at stress levels greater than 50 percent of the ultimate strength. Sustained loadings at a stress level of 25 percent did not reduce ultimate strength capacity for a loading period of 1000 hr. 6. Polymer Cement Concrete (PCC) Polymer cement concrete is made by mixing cement, aggregates, water and monomer, such plastic mixture is cast in moulds.Cured, dried and polymerized. The monomers that are used in PCC are: a) Polyster-styrene. b) Epoxy-styrene c) Furans d) Vinylidene Chloride However, the results obtained by the production of PCC in this way have been disappointing and have shown relatively modest improvement of strength and durability. In many cases material s poorer than ordinary concrete are obtained. This behavior is explained by the fact that organic materials (monomers) are incompatible with aqueous systems and sometimes interfere with the alkaline cement hydration process.Recently Russian authors have reported the production of a superior Polymer cement concrete by the incorporation of furfural alcohol and aniline hydrochloride in the wet mix. This material is claimed to be specially dense and non-shrinking and to have high corrosion resistance, low permeability and high resistance to vibrations and axial extension. Washington State University in cooperation with Bureau of Reclamation tested the incorporation of several monomers into Wet Concrete for preparing PCC for fabrication of distillation units for water desalination plants.However, it is reported that only epoxy resin produced a concrete that showed some superior characteristics over ordinary concrete. †¢ The materials and the production technology for concrete in PCC are the same as those used in normal Portland Cement concrete except that latex, which is a colloidal suspension of polymer in water, is used as an admixture. †¢ Earlier latexes were based on polyvinyl acetate or polyvinylidene chloride, but these are seldom used now because of the risk of corrosion of steel in concrete in the latter case, and low wet strengths in the former. Elasto-meric or rubberlike polymers based on styrenebutadiene and polyacrylate copolymers are more commonly used now. Latex: †¢ A latex generally contains about 50 % by weight of spherical and very small (0. 01 to 1 m in diameter) polymer articles held in suspension in water by surface-active agents. †¢ The presence of surface-active agents in the latex tends to incorporate large amounts of entrained air in concrete; therefore, air detraining agents are usually added to commercial latexes. 10 to 25 percent polymer (solid basis) by weight of cement is used in typical PCC formulations †¢ The addition of latex provides a large quantity of the needed mixing water in concrete. †¢ The application of PCC is limited to overlays where durability to severe environmental conditions is of primary concern. †¢ PCC is made with as low an addition of extra mixing water as possible; the spherical polymer molecules and the entrained air associated with the latex usually provide excellent workability. Concrete Mix and Curing: †¢ Typically, water-cement ratios are in the range0. 40 to 0. 5, and cement contents are on the order of 390 to 420 kg/m3. †¢ The hardening of a latex takes place by drying or loss of water. †¢ Dry curing is mandatory for PCC; the material cured in air is believed to form a continuous and coherent polymer film which coats the cement hydration products, aggregate particles, and even the capillary pores. Properties: †¢ The most impressive characteristics of PCC are its ability to bond strongly with old concrete, and to resist the entry o f water and aggressive solutions. †¢ It is believed that the polymer film lining the capillary pores and micro-cracks does an excellent job in impeding the fluid flow in PCC. These characteristics have made the PCC a popular material for rehabilitation of deteriorated floors, pavements, and bridge decks. 7. Polymer Impregnated Concrete (PIC) Polymer impregnated concrete is one of the widely used polymer composite. It is nothing but a pre-cast conventional concrete, cured and dried in oven, or by dielectric heating from which the air in the open cell is removed by vacuum. Then a low viscosity monomer is diffused through the open cell and polymerized by using radiation, application of heat or by chemical initiation. Mainly the following types of monomer are used: a) Methylmethacrylate (MMA) ) Styrene c) Acrylonitrile d) T-butyl styrene e) Other thermoplastic monomers The amount of monomer that can be loaded into a concrete specimen is limited by the amount of water and air that h as occupied the total void space. It is necessary to know the concentration of water and air void in the system to determine the rate of monomer penetration. However, the main research effort has been towards obtaining a maximum monomer loading in concrete by the removal of water and air from the concrete by vacuum or thermal drying, the latter being more practicable for water removal because of its rapidity.Another parameter to consider is evacuation of the specimen prior to soaking in monomer. This eliminates the entrapment of air towards the centre of the specimen during soaking which might otherwise prevent total or maximum monomer loading. The application of pressure is another technique to reduce monomer loading time. 8. Partially Impregnated (or Coated in Depth CID) and Surface Coated (SC) Concrete Partial impregnation may be sufficient in situations where the major requirement is surface resistance against chemical and mechanical attack in addition to strength increase.Even with only partial impregnation, significant increase in the strength of original concrete has been obtained. The partially impregnated concrete could be produced by initially soaking the dried specimens in liquid monomer like methyl methacrylate, then sealing them by keeping them under hot water at 70 C to prevent or minimize loss due to evaporation. The polymerization can be done by using thermal catalytic method in which three per cent by weight of benzoyl peroxide is added to the monomer as a catalyst. It is seen that the depth of monomer penetration is dependent upon following: a) Pore structure of hardened and dried concrete ) The duration of soaking, and c) The viscosity of the monomer The potential application of polymer impregnated concrete surface treatment (surface coated concrete, SC) is in improving the durability of concrete bridge decks. Bridge deck deterioration is a serious problem everywhere, particularly due to an abrasive wear, freeze-thaw deterioration, spalling and corrosion of reinforcement. Excellent penetration has been achieved by ponding the monomer on the concrete surface. Due care should be taken to prevent evaporation of monomer when ponded on concrete surface.A 5 cms thick slab, on being soaked by MMA for 25 hours produced a polymer surface coated depth of 2. 5 cms. Significant increases in the tensile and compressive strengths, modulus of elasticity and resistance to acid attack have been achieved. The application of monomer for field application like in bridge decks poses more problems than laboratory application. A typical surface treatment in the field can be done in the following manner. a) The surface is dried for several days with electrical heating blanket. b) Remove the heating blanket and cover the slab with 0. 4 cum oven-dried light-weight aggregate per 100 sqm. c) Apply initially 2,000 to 3,000 ml of the monomer system per square meter. d) Cover the surface with polyethylene to retard evaporation. e) Shade the surface to prevent temperature increase which might initiate polymerization prematurely, that may reduce penetration into the concrete. f) Add periodically additional monomer to keep the aggregate moist for minimum soak time of 8 hours. g) Apply heat to polymerize the monometer: Heating blanket, steam or hot water can be used for this purpose. Some of the promising monomer systems for this purpose are: ) Methylmethacrystalate (MMA), 1% Benzoyl peroxide (BP), 10% Trimethylopropane thimethacrylate (TMPTMA). b) Isodecyl methacrystalate (IDMA), 1% BP, 10% TMPTMA c) Isobutylmethacrystalate (IBMA), 1% BP, 10% TMPTMA BP acts as a catalyst and TMPTMA is a cross linking agent which helps in polymerization at low temperature of 52%C. 9. Properties of Polymer Impregnated Concrete Since polymer impregnated concrete (PIC) is one of the most important category of polymer concrete, the properties of PIC are discussed below. Stress – Strain Relationship The stress strain curve for MMA –impreg nated concrete tested to failure is shown in fig. elow.. PIC has a nearly linear stress strain relationship to failure. There is very little departure from linearity upto 90% of ultimate strength and there is no abrupt change at the proportional limit. The stress strain curves for Styrene TMTMPTMA impregnated concrete also show the same characteristics as for MMA impregnated concrete. The modulus of elasticity increased from 27 GPa for un-impregnated specimen to 49 GPa for MMA impregnated specimens. [pic] Compressive Strength The effect of polymer loading on the compressive strength in PIC is given in the following figure.Using methylemethacrystalate as monomer and with a polymer loading of 6. 4%, strength of the order of 144 MPa have been obtained using radiation technique of polymerization. (The control specimen had compressive strength of 38 MPa). The compressive strength obtained with thermal catalytic process was 130 MPa. [pic] [pic] Styrene impregnated specimens exhibit simila r trends, except that the strength levels were somewhat lower. The polymerization by radiation method produced a concrete of higher strength than the produced by thermal catalytic method.Perlite concrete impregnated with MMA and polyester styrene have also shown considerable increases in compressive strengths. It is found the higher strengths are obtained with MMA impregnated sample than with polyester styrene. The average compressive strength for a 1:8 non-air entrained perlite concrete samples, impregnated with MMA was 56 MPa for polymer loading of 63% compared to control specimen of compressive strength 1. 2 MPa. Tensile Strength The increase in tensile strength in the case of PIC has been observed to be as high as 3. times that of the control specimen for polymer loading of 6. 4% MMA i. e. impregnated concrete have shown tensile strength of the order of 11. 6 MPa compared to the strength of control specimen of 3 MPa using radiation process of polymerization. Thermal catalyticall y initiated polymerization, produced concrete with tensile strength 3. 6 times that of the control specimen and 7. 3% less than that of radiation produced concrete. Polymer Concrete : Polyester resin concrete with binder continent varying from 20 to 25% have shown tensile strengths in the range of 9 to 10 MPa at 7 days.Polymer Cement Concrete: Polymer cement concrete using latex has given tensile strength of 5. 8 MPa with a latex / cement ratio of 0. 25; compared to the control specimen of 4. 4 MPa strength. The increase in tensile strength is very modest. Flexural Strength Polymer impregnated concrete with polymer loading of 5. 6% MMA and polymerized by radiation have shown flexural strength 3. 6 times more than that of the control specimen, i. e. the flexural strength was increased to 18. 8 MPa from 5. 2 MPa. Polymer Concrete (PC) Polymer resin concrete has been reported to give flexural strength of the order of 15 MPa at 7 days.Creep Compressive Creep deformation of MMA impregnat ed concrete and styrene-impregnated concrete has been observed to be in direction opposite to that of the applied road i. e, Negative Creep. After the typical initial movement during load application, these concretes expand under sustained compression. The reason for this negative creep in PIC is not very clear though it may be possible that it is due to residual stresses generated in the concrete after polymerization of monomers. The increased volume may also be due to phase changes induced by pressure. This behaviour has been noticed at a relatively loiw loading of 5. MPa. Otherwise creep deformation of PIC concrete is generally one-tenth of conventional concrete, when compared on a basis of deformation per unit load. Creep deformation generally stabilizes after two to three months. Shrinking due to Polymerisation Shrinkage occurs through two stages of impregnation treatment i. e. , through initial drying and through polymerisation. The shrinkage through polymerisation is peculiar to PIC and could be several times greater than the normal drying shrinkage. It has been seen that for the same base material, different monomer systems cause different amounts of shrinkage.It is expected that the shrinkage due to polymerisation will be less for a base that has higher modulus of elasticity. Durability The saturation of the hydrated cement with corrosion resistant polymer probably acts as a protective coating and results in excellent improvement in durability. a) Frees Thaw Resistance: Polymer impregnated concrete has shown excellent resistance to freeze-thaw MMA impregnated and radiation polymerized specimens have withstood 8110 cyclens of freeze-thaw compared to 740 cycles in case of unimpregnated concrete. Even partially impregnated concrete withstood 2310 cycles. ) Resistance to Sulphate Attack: Keeping a failure criteria of 0. 5% expansion, it has been observed that there is atleast 200 percent improvement in the resistance of polymer impregnated concrete and 89 % improvement in the case of partially impregnated concrete over the conventional concrete. c) Acid Resistance: The acid resistance of PIC has been observed to improve by 1200 percent when exposed to 15% HCI for 1395 days. Water Absorption A maximum reduction of 95 percent in water absorption has been observed with concrete containing 5. 9 percent polymer loading. Co-efficient of Thermal Expansion:Polymer impregnated concrete has higher co-efficient of thermal expansion compared to conventional concrete. Compared to the unimpregnated concrete having a value of 4. 02 X 10-6, a 5. 5% MMA, radiation polymerized concrete has a co-efficient of thermal expansion of 5. 63 X 10-6, and styrene impregnated specimens have shown a value of 5. 10 X 10-6. Resistance to Abrasion Polymer impregnated concrete has shown appreciable improvement in resistance to abrasion. A 5. 5% MMA impregnated concrete has been found to be 50 to 80 per cent more resistance to abrasion than the control specimen.Even s urface impregnated concrete slabs have shown an improvement of 20 to 50%. Wear and Skid Resistance. Though there may be apprehension that polymer filled voids in polymer concrete might produce a slippery surface, on actual wear track test, it was found that the treated surfaces show excellent skid resistance compared to the unimpregnated surfaces. The wear after 50,000 simlated vehicular passes has been less than 0. 025cm. Fracture of Polymer impregnated Concrete Polymer impregnation of concrete changes its microstructure radically resulting in a change in the cracking behaviour of the impregnated concrete under load.Impregnation improves the strength of the mortar matrix and also the strength of the paste-aggregate interface by elimination of microcracks. Polymer probably enters the aggregates also and forms a network of polymer fibres across the interface, thus strengthening it. Radiographic studies have shown that micro cracking starts first around 70 to 80% of the ultimate load, very often in the mortar phase. When an advancing crack reaches an aggregate, it does not follow the aggregate boundary as in ordinary concrete, but usually propagates through the aggregate.This indicates that the paste aggregate interface bond is significantly improved by polymer impregnation. It has been observed that PIC indicates nearly linear behaviour to failure, which is typical of brittle material. The brittle nature of PIC presents a severe design limitation. It would be ideal to produce a material with the slow failure mode of normal concrete while retaining the high strength and modulus of elasticity of PIC. One method to achieve this ideal is to adjust the past aggregate bond so that the failure mode is through the interface like in ordinary concrete.In principle, this can be achieved by using a very strong and tough aggregate, so that the advancing crack is diverted round to the paste-aggregate interface. The fracture mode of PIC can also be altered by incorporating a small quantity (1% by volume) of fibres in the matrix. The fibres do not affect the modulus of elasticity of concrete due to their low concentration, but serve to inhibit crack propagation through the mortar by acting as crack arrestors. 10. Sequence of Operations Drying and evacuation:The time and temperature needed for removal of free water from the capillary pores of moist-cured products depend on the thickness of the elements. At the drying temperatures ordinarily used (i. e. , 105 C), it may require 3 to 7 days before free water has been completely removed from a 150- by 300-mm concrete cylinder. Temperatures on the order of 150 C can accelerate the drying process so that it is complete in 1 to 2 days. Soaking the dried concrete in a monomer: The in situ penetration of concrete in the field may be achieved by surface ponding, but precast elements are directly immersed in the monomercatalyst mixture.Commercial monomers contain inhibitors that prevent premature polymerization dur ing storage; the catalyst serves to overcome the effect of the inhibitor. Sealing the monomer: To prevent loss of monomer by evaporation during handling and polymerization, the impregnated elements must be effectively sealed in steel containers or several layers of aluminum foil; In the rehabilitation of bridge decks this has been achieved by covering the surface with sand. Polymerizing the monomer: Thermal – catalytical polymerization is the preferred technique.The time for complete polymerization of the monomer in the sealed elements exposed to steam, hot water or air, or infrared heat at 70 to C may vary from a few to several hours. In the case of a MMA-benzoyl peroxide mixture, no differences in strength were found between specimens polymerized at C with hot air for 16 hr or with hot water for 4 hr. 11. Application of Polymer Impregnated Concrete Keeping in view the numerous beneficial properties of the PIC, it is found useful in a large number of applications, some of wh ich have been listed and discussed below: a) Pre-fabricated structural elements. ) Pre-stressed Concrete c) Marine works d) Desalination Plants e) Nuclear Power plants f) Sewage works-pipe and disposal works. g) Ferro cement products h) For water proofing of structures i) Industrial applications a) Pre-fabricated Structural Elements: For solving the tremendous problem of Urban Housing shortage, maintaining quality, economy and speed, builders had to fall back on pre-fabricated techniques of construction. At present due to the low strength of conventional concrete, the pre-fabricated sections are large and heavy, resulting in costly handling and erection.These reasons have prevented wide adoption of pre-fabrication in many countries. At present, the technique of polymer impregnation is ideally suited for pre cast concrete, it will find unquestionable use in industrialization of building components. Owning to higher strength, much thinner and lighter sections could be used which enabl es easy handling and erection. They can be even used in high rise building without much difficulties. b) Pre-stressed Concrete: Further development in pre-stressed concrete is hindered by the inability to produce high strength concrete, compactable with the high tensile steel available for pre-stressing.Since PIC provides a high compressive strength of the order of 100 to 140 MPa, it will be possible to use it for larger spans and for heavier loads. Low creep properties of PIC will also make it a good material for pre-stressed concrete. c) Marine Works: Aggressive nature of sea water, abrasive and leaching action of waves and inherent porosity, impair the durability of conventional concrete in marine works. PIC possessing high surface hardness, very low permeability and greatly increased resistance to chemical attack, is a suitable material for marine works. ) Desalination Plants: Desalination of sea water is being resorted to augment the shortage of surface and ground water in many countries. The material used in construction of flash distillation vessels in such works has to withstand the corrosive effects of disilted water, brine and vapour at temperature up to 1430 C. Carbon steel vessels which are currently in use are comparatively costly and deteriorate after prolonged use. Preliminary economic evaluation has indicated a savings in construction cost over that of conventional concrete by the use of PIC. ) Nuclear Power Plants: To cope up with the growing power requirements for industrial purposes, many countries are resorting to nuclear power generation. The Nuclear contained vessel (Pressure vessel) is a major element, which is required to withstand high temperatures and provide shield against radiations. Another attendant problem of nuclear power generation is the containment of spent fuel rods which are radioactive over long period of time to avoid radiation hazards. At present heavy weight concrete is being used for this purpose, which is not very eff ective.PIC having high impermeability coupled with high strength and marked durability provides an answer to these problems. f) Sewage Disposal Works: It is common experience that concrete sewer pipes deteriorate due to the attack of effluents and when buried in sulphate infested soils. Further in the sewage treatment plant, concrete structures are subjected to severe attack from corrosive gases particularly in sludge digestion tanks. Polymer-impregnated concrete due to its high sulphate and acid resistance, will prove to be a suitable material in these situations. ) Impregnation of Ferro-cement products: The ferro-cement techniques of construction is being extensively used in the manufacture of boats, fishing trawlers, domestic water tanks, grain storage tanks, man hole cover, etc. , Ferro cement products are generally this (1 to 4 cms) and as such are liable to corrode. Application of polymer impregnation techniques should improve the functional efficiency of ferro-cement products . h) Water Proofing of Structures: Seepage and leakage of water through roof and bathroom slabs, it a nagging problem and has not been fully over come by the use of conventional water proofing methods.The use of polymer impregnated mortar should solve this problem. i) Industrial Applications: Concrete has been used for floor in tanneries, Chemical Factories, dairy farms and in similar situations for withstanding the chemical attack, but performance has not been very satisfactory. The newly developed PIC will provide a permanent solution for durable flooring in such situations. 12. Case Studies: Two case studies are presented as follows: 1. Properties of Fiber Reinforced Polymer Concrete studied by Marinela Barbuta and Maria Harja 2. Polymer Concrete for Structural Restoration and Corrosion Protection of Concrete Support Columns.I. Properties of Fiber Reinforced Polymer Concrete studied by Marinela Barbuta and Maria Harja The experimental results of studies regarding polymer concrete with cellulose fibers are presented. The compositions used in the present study derive from a previous one which investigated a large number of compositions using different dosages of resin and filler. The mechanical characteristics such as: compressive strength, flexural strength and split tensile strength were investigated on fiber reinforced polymer concrete made with different dosages of resin and filler, the fiber dosage being constant for all mixtures.Materials The experimental researches on polymer concrete were made by using the following materials: polymer, fly ash as filler, crushed aggregates and fiber type ARBOCEL. The polymer was type epoxy resin, called ROPOXID, made in Romania by POLICOLOR Bucharest . The hardener was type ROMANID 407, also made by POLICOLOR Bucharest. The fly ash (FA) from the power plant CET Holboca, Jassy, was added to the fine aggregates. The fly ash is an inorganic waste produced by burning pulverized coal in power stations. Fly ash consists of many small, glass-like particles ranging in size from 0. 01 to 100 ? m.Chemically FA contains oxides, hydroxides, carbonates, silicates, and sulphates of calcium, iron and aluminum. The content in carbon is given from loss ignition. FA is a heterogeneous mixture of amorphous and crystalline phases and is generally considered to be a ferroaluminosilicate element. The mineralogical, physical and chemical properties of FA depend on the nature and composition of the coal, conditions of combustion, type of emission control devices, storage and evacuation methods. Storage methods may affect weathering rates, especially under humid conditions where soluble constituents may be leached.The principal characteristics of FA are: colour gray to black, function of carbon unburned, particles sizes between 0. 01 to 100 ? m; the shape of particles is spherical, specific surface is between 4,800. . . 5,200, the density is between 2,400 and 2,550 kg/m3 [ The aggregates were used in two sorts: 0. . . 4 mm and 4. . . 8 mm, with continuous granulosity, obtained from crushed river gravel by S. C. EMBERON SRL Jassy. The ARBOCEL fibers are natural cellulose fibers, produced by J. Rettenmaier & S? ohne GMBH. ARBOCEL is produced from cellulose in various qualities (fiber lengths, thicknesses, purities, etc. The properties of ARBOCEL cellulose fibers are: mean fiber length of 10 ? m, completely safe, insoluble in water and organic solvents, resistant to dilute acids and bases. The fiber was used in proportion of 3% from the mass of resin plus the hardener. Experimental Samples For the study of polymer concrete properties nine compositions (BPFF) were prepared in the experimental program (Table 1). [pic] The polymer concrete with different compositions as is given in Table 1, was prepared by mixing firstly the resin with hardener, then after complete homogenization the fibers were introduced in the mixture as shown in fig below [pic] Fig 1. Cellulose fiber mixing with resin. The fly ash w as added to the mix of aggregates and the resin and aggregates were mixed by the mechanical mixer. After complete mixing, the polymer concrete was poured in formworks. For each composition the density was determined. The following mechanical characteristics were experimentally tested: compressive strength on cube sample of 70. 7 mm sizes, flexural strength and split tensile strength on prismatic samples of sizes 210? 70? 70 mm, according to standard prescriptions. [pic] Fig. 2. – Samples of polymer concrete with fibers. Results and DiscussionsAccording to EN 12390/2001 the mechanical characteristics of polymer concrete with cellulose fiber, experimentally determined namely: compressivestrength (fc), flexural strength (fti) and split tensile strength (ftd) are given in Table below . [pic] From the experimental results the following observations can be made: a) The values of compressive strengths for polymer concrete with fibers (Fig. 3) vary between 62. 62 MPa (for BPFF7) and 46. 41 MPa (for BPFF2). Fig. 3. – Variation of compressive strength for polymer concrete with fiber. [pic] Fig. 3. – Variation of compressive strength for polymer concrete with fiber. ) With the increasing of resin and fly ash dosage the compressive strengths increase (Figs. 4 and 5). [pic] Compressive strength, MPa Fig. 4. – Variation of compressive strength for polymer concrete with fiber vs. the resin content, for 6. 4% FA. [pic] Fig. 5. – Variation of compressive strength for polymer concrete with fiber vs. the FA content, for 12. 4% resin. d) The values of flexure strengths for polymer concrete with fibers (Fig. 6)vary between 17. 57 MPa (for BPFF9) and 13. 55 MPa (for BPFF8), so, the decrease of resin dosage results in the increase of flexure strength. pic] Fig. 6. – Variation of flexural strength for polymer concrete with fiber. [pic] [pic] Fig. 7. – Variation of split tensile strength for polymer concrete with fiber: a – vs. t he resin content; b – vs. the sample number. d) The values of split tensile strengths for polymer concrete with fibers (Fig. 7) vary between 6. 94 MPa (for BPFF9) and 4. 29 N/mm2 (for BFF7); the increase of resin dosage results in the increase of split tensile strength. The experimental researches lead to the following observations: a) For the maximum epoxy resin dosage (16. %) compressive strength is reduced near minimum value, the flexure strength is medium, but the split tensile strength has high value. b) For the minimum epoxy resin dosage (12. 4%) compressive strength is reduced under the medium value, the flexure strength is also reduced, and the split tensile strength has value over the medium. c) For the maximum fly ash dosage (12. 8%) compressive strength and flexurestrength are medium, but the split tensile strength is near the highest value. d) For the minimum fly ash dosage (6. 4%) compressive strength and flexure strength are under the medium and the split tensil e strength is near medium value. ) For the same dosage of epoxy resin the maximum compressive strength and flexure strength were obtained for maximum fly ash dosage. It results that for increasing the compressive strength and flexure strength at same dosage of resin and fiber, it must be used the maximum dosage of fly ash. f) For the split tensile strength it must be used a medium fly ash dosage; The values of mechanical characteristics of polymer concrete are smaller then those of mechanical characteristics obtained for polymer concrete with silica fume and polymer concrete with fly ash . The author concluded that The experimental researches concerning the polymer concrete had investigatedthe mechanical characteristics of epoxy polymer concrete prepared with cellulose fibers and fly ash as filler. †¢ When the same dosage of cellulose fibers is used, the content of resin must be increased. Also for obtaining good mechanical properties the filler is used with higher dosages. â⠂¬ ¢ The experimental values of mechanical strengths for polymer concrete with cellulose fibers were smaller then that for polymer concrete without fibers. This type of fibers is not a good choice for polymer concrete reinforcement. II.Polymer Concrete for Structural Restoration and Corrosion Protection of Concrete Support Columns by David E. Snider and Heather M. Ramsey of Sauereisen Inc. A large copper mine and refinery in the western United States had a dilemma. Their cell house, which contains over 1,500 cells, each holding more than 20,000 gallons of electrolyte, had experienced severe corrosion and structural degradation of the support columns for the tanks. These columns support the cells in their solvent extraction and electrowinning process. This process entails immersion of a stainless steel cathode or â€Å"starter plate† into the electrolyte.Pure copper is deposited onto the starter plate during this 10-day digestion process. The collected copper is then further r efined at a separate location. Over time, highly acidic leakage from the cells had corroded the support columns to the point that their ability to adequately withstand the imposed load was in doubt. Additionally, the refinery desired to upgrade the facility’s ability to withstand seismic activity. The leakage, primarily copper sulfate and 25% sulfuric acid at a pH of 1. 0 or less, corroded not only the concrete but more significantly the reinforcement bar (rebar) encased in the concrete.Corrosion of the rebar resulted in an increase of internal pressure due to expansion of the corrosion products, therefore putting the concrete in high tensile stress. The direct effect of this stress was cracking and spalling of the concrete. Figure 1 shows a typical degradated column requiring restoration. [pic] The original construction of the columns used the rebar spaced 6-inches on center vertically and 18-inches on center horizontally. The refinery’s standard repair procedure was to remove corrosion products from the concrete and steel and then to top them with a polymer-modified portland-cement mortar.This standard repair method requires two (2) to three (3) days per column, and although temporarily affective, did not meet the company’s desire for a long-term solution. They decided upon a new approach using a polymer concrete (PC), which is a bisphenol A based-epoxy. This material is designed for maximum flowability, mechanical properties and chemical resistance. The PC repair system utilizes the polymer concrete for encapsulation, chemical protection, mechanical support and resistance to physical abuse. Figures 2 illustrates the method by which the stainless steel rebar was attached to the columns after surface-preparation.Stainless steel rebar was imbedded into the concrete floor using an epoxy mortar. Channels were saw-cut vertically in the concrete column. These channels provided a recess into which the rebar was bent and then secured into place with the epoxy mortar. Grouting of the rebar with this high strength epoxy mortar also served to provide tensile stress relief. By lowering stress relief, corrosion rates are reduced. [pic] Figure 2. Stainless steel rebar bent and grouted into the channels. To further ensure structural integrity and to upgrade seismic capabilities, the company chose to use fiberglass reinforcement (FRP) strips and wraps nder the PC. The strips were installed vertically on the columns and a fiberglass fabric was wrapped around the columns horizontally. The columns were formed and the polymer concrete was poured into place completely encapsulating the columns, the rebar and the FRP. This method required two (2) days per column. To date, 75 columns have been repaired using this method. Figures 3 and 4 show the forming and pouring of the PC. Figure 5 shows the PC after the form has been removed and the FRP that was applied to the columns. [pic] Figure 3. The forms placed around the column. . [pic] As me ntioned earlier, an important property of the PC is the flowability. The test for this property is ASTM C-143 and measures the â€Å"slump† of the polymer concrete. (Figure 6). A slump of 6 inches is considered to be flowable. This particular polymer concrete exhibits a slump of 8-inches, which is very flowable. Figures 6, 7 and 8 illustrate the flowability of the polymer concrete mixture. Table 1 lists some of the other physical properties of the polymer concrete used on this repair that were important considerations. [pic] Property at 7-days Value Property at 7- Days | Value | |Density |135 pounds/cft (2. 2gm/sq. cm) | |Compressive Strength |12,000 psi (84. 4 N/sq mm) | |Flexural Strength |3,000 psi (21. 1 N/ Sq. mm) | |Modulus of Elasticity |1. 08x 10(6)psi 7600 N/Sq mm | |Shrinkage` |0. 9 % | |Tensile Strength |2,400 psi (16. 9 N/Sq. mm) | The PC is roughly three times as strong as a portland cement mix (about 4,000 psi (281 kg / sq. cm. 28. 1 N/sq mm)) and is not chemic ally affected by the electrolyte. These properties make it an ideal product for the column restoration. As expected, none of the 75 columns repaired to date have exhibited any signs of failure and have required no maintenance since the repair program commenced in early 2007.Coatings will typically have a service life of 8 to 15 years depending upon the exposure and physical abuse. However, in this case, typical service life of coatings was six months. Their service life is also affected and somewhat limited as a result of application thickness. Coatings are generally applied at thicknesses ranging from a few mils up to a few hundred mils. Polymer concretes, however, are applied at a minimum thickness of 1 inch and may be applied as thick as 18 inches. The thickness of barrier coatings determines the overall permeability, which is a measure of water vapor’s ability to pass through a material.If the coating is less than 250 mils, the method used to determine permeability is bas ed on the water-vapor transmission (WVT) test ASTM E-96 or ASTM D-1653. Permeance is calculated from WVT. Permeability is obtained by multiplying permeance by thickness. A permeability of 10-8 (1. 49 x 10- 17 grams/Pa†¢s†¢m) or less is generally considered to provide a good barrier coating. Also due to the thickness, and other considerations, the service life of a polymer concrete is longer and requires far less maintenance. Experience with PCs by this manufacturer has shown no failures after 15 years of service.Laboratory evaluations coupled with field observations indicate the service life of PCs to be typically greater than 25 years. Figure 9 illustrates the completed column, including a protective topcoat for the FRP reinforced concrete. Although not needed for functionality, the topcoat was extended over the PC for aesthetics and coating integrity. [pic] Figure 9. Completed column repair. Many users of polymer concretes will entirely replace portland concrete with a f ull thickness of the polymer concrete. This is particularly true when extended downtimes are prohibitive. The lengthy cure time for standard portland based ement prior to receiving a protective coating is unacceptable for many facilities. After placement, polymer concretes may be placed into full chemical service after a 24-hour cure. Furthermore, with the strengths achieved with PC, it is usually possible to reduce the overall thickness to about ? of that commonly used with portland concretes. Typical thicknesses for PCs range from 1-inch to 4-inches. Polymer concretes may be engineered, formed and placed in the same manner that one would employ with a portland concrete structure. They also are reinforced in the same manner as portland concretes.Polymer concrete thicknesses are typically much less than that of the Portland concrete, therefore smaller diameter rebar is often used. At a thickness of 1 inch, one would use lesser thick rebar instead of a reasonably higher thick rebar c ommonly found with portland concrete constructions. Due to the ease of installation, the facility’s local preferred contractor was able to perform the work. The author concluded that Polymer concretes, which do not contain portland cement, have demonstrated tenacity as a protective barrier material in this difficult application and many others.This application required corrosion protection from a severely aggressive electrolyte, as well as protection from physical abuse. Other essential requirements were a system affording both ease of use and a quick turnaround time. Polymer concretes are also proving to be cost effective alternatives to using portland cement-based concretes with chemical-resistant topcoats for corrosion protection. The cost of maintenance for polymer concretes per year of service life is significantly less than that of concrete with applied barrier coatings, which may require multiple re-applications over the same number of years of service.Conclusion: 1. T he major factor that has been responsible for the extensive use of polymer-based materials in civil engineering is their advantages, viz . increased tensile strength, compressive strength, freeze-thaw durability, and decreased water permeability to a negligible value. 2. Owing to its excellent resistance to chemical attack i. e sulphate attack, acidic attack, saline water, radiation from nuclear substances polymer concrete has great potential over Portland cement for the design of structures in such industries, desalination plants, nuclear plants, underwater structures, overlays in bridge decks. . There are many type of application of repairing material available such as grout, motar, concrete, sprayed concrete and cement based material. Among these, resin based materials are performed much better than the others. 4. The cost of maintenance for polymer concretes per year of service life is significantly less than that of concrete with applied barrier coatings, which may require mult iple re-applications over the same number of years of service. 5. Extended use of pre stressed elements could be permitted with the reduced permeability possible. 6.The incorporation of dyes with the plastics used for polymerization opens another aesthetic aspect of concern to civil engineers and architects, as does the potential size decrease for greater span/depth ratios. 7. The only barrier to be focussed on is its higher cost in comparison to OPC and further research for economic production of polymer concrete would help to overcome this problem. References 1. â€Å"Properties of Fiber Reinforced Polymner Concrete†, Msrinela Barbuta and Maria Harja, Univerisity Technica, Tomul LIV(LVIII) Fasc,3, 2008, Constructii Architectura. . Muttukumar M. , Mohan D. J. , Polymer Res. 12, (2004) 3. â€Å"Polymer Concrete for Structural Restoration and corrosion protection of Concrete Support Columns† of David E. Snider and Heather M. Samsey of Sauereisen Inc. , 4. â€Å"Polymer concrete and its potential in the Construction industry†, Luke M. Snell,1 H. Aldridge Gillespie, and Robert Y. Nelson, Department of Civil Engineering, West Virginia University, Morgantown, West Virginia, and School of Civil Engineering and Environmental Science, University of Oklahoma Norman

how rap effects socity essays

how rap effects socity essays Many individuals in our society today believe that the positive portrayal of violence and sex in rap music has negative effects on its listeners. Due to this widespread perception, many studies have systematically examined rap music for evidence of its negative effects. This issue is important in that rap music has become a universal form of art. Rap music has spread into the suburbs where affluent white youth are among its greatest supporters. It is important to document the extent to which the positive portrayal of violence and sex in rap music effects its listeners, since such music may have a negative impact on today's youth. Violent crime increased by over 500 percent during the three decades ending in 1990. There may be a host of factors contributing to this social pathology, but "violence in the media" is certainly one of them. "Music industry insiders often shirk responsibility by saying their music reflects society but does not impact it," Waliszewski observes. "Some music industry insiders . . . have argued that, as performers and 'actors on the stage,' musicians cannot be held responsible for their fans' criminal behavior. Their anti-social messages are not to be taken seriously because . . . they don't actually mean what they say." Such claims are disingenuous at best. Whether they know what they're doing or not, the purveyors of this musical madness should be held accountable for the damage they've done to an entire generation of young ...

Interview : Interview / Background

For this interview process, my initial intention was for it not to be so much of a question and answer type of interview. Since I do have a relationship with these two ladies, I was wanting to make this as smooth, casual and fun as possible. This helped, because it did not create any form of uncomfortable situations; by creating awkward situations, I feel that it can alter the way the interview is conducted and how it can be of a result. The interview took place at as restaurant where the three of†¦ In my interview I choose to interview one of my housemates Samantha Wood. I do not know Samantha very well but have communicated with her the odd time. Samantha goes to Georgian college and is 21 years old. I choose to interview her specifically because she is quite about her life and interests so I was motivated to use this interview to get to know her better. I asked Samantha basic questions about her use of and experiences with social media. The interview process was beneficial for what information†¦ This paper intends to describe an interview conducted with an eight year old about sports. A remarkable quote from this young man was â€Å" I only struck out twice last season and I didn’t get out after that at all†. The sports that Cannon Crooks plays, his favorite sport, his favorite player, his favorite position, and future aspirations and more shall be covered in this paper. The interview was conducted over the phone with an eight-year-old boy named Cannon Crooks. Cannon Crooks is a third grader†¦ There are three types of interviews: structured interviews, semi structured interviews, and unstructured interviews. Structured interviews are interviews that are formal such as telephone interviews, survey research and political polling. The interview is set up with a designed place ahead of time and a set of questions preplanned. Semi structured interviews are interviews that allows the interviewee to talk about a topic more â€Å"open minded† (pg. 87) rather than structured and to the point. The interviewer†¦ research that a well-prepared interview guide is crucial. Within the interview guide, all the items of the interview are included and organised in a certain order with the purpose of promote the flow of the interview. This includes the sections of the interview, task that the interviewer has to do and designed questions with careful wording selection. Although the role of interview guide is crucial in semi-structured interview, it is stressed that the idea of interview guide is â€Å"much less specific†¦ Family Interview and Genogram I chose to interview Inmaculada â€Å"Alex† DeFeo (2015). She is the source of much of the information. I based assessments on my analysis of her explained life. Detailed is given to her age and familial relations. The strength perspective used in order to highlight strengths in how overcoming or living with situations, statuses, and results of events. Individual and family patterns, concern, and influences regarding them aimed are touched upon. Family Members Names†¦ selects interview as the second method to generate the data. This paper, for that selection, deals with the second key research instruments, interview. Specifically, it explains and proposes a plan for carrying out interview for the research. The section starts with discussing the advantages of interview instrument. What follows after is a brief overview and discussion around the issue of critical dimension of interview. This review helps to provide guidelines for the deployment of interview in this†¦ At the very beginning of the interview I noticed how much I was looking down to document what Amy was saying. I was so focused on making sure I had documented everything Amy said and I think I lost some meanings by not watching her body language. If I were to put myself in Amy’s position I probably would have felt like I was just there to answer a bunch of assessment questions and the therapist really did not care what I had to say. The empathy was there in my voice, but not in my actions, so†¦ Interview Analysis The mock interview assignment really helped me identify different strengths and weaknesses in interviewing. This document will be a discussion of my mock interview. I will discuss my strengths during the interview as well as my faults and what I will do in the future to adjust those. I will apply what I learned in this experience to interviews in the future. Perhaps one of the easiest weaknesses to identify in my interview was in my appearance, specifically my hat I forgot to†¦ The majority of the interview took place during periods three, five, and six, but I was able to ask her a few questions before and between the other periods I shadowed her. I first asked her about her schedule and what classes she had other than English and math at the end of the day. She explained that she had three other classes, government, IT, and band. When I expressed curiosity as to how that worked since she didn’t have a science course. Students are given the option to opt out of science†¦

The importance of scientific research (Quantitative Methods) Essay

The importance of scientific research (Quantitative Methods) - Essay Example Fabrication occurs whÐ µn sciÐ µntific rÐ µsÐ µarch is not Ð µmpirically groundÐ µd, and thÐ µ rÐ µsÐ µarch writÐ µr or sciÐ µntists tampÐ µr with Ð µvidÐ µncÐ µ, procÐ µdurÐ µs, or rÐ µsults in a way that Ð µithÐ µr provÐ µs or disprovÐ µs thÐ µir hypothÐ µsis artificially. FabricatÐ µd rÐ µsults, for Ð µxamplÐ µ, may Ð µxaggÐ µratÐ µ or changÐ µ cÐ µrtain variablÐ µs, just to support thÐ µ Ð µnd rÐ µsult as a form of rÐ µsÐ µarchÐ µr bias which is prÐ µdÐ µtÐ µrminÐ µd ahÐ µad of timÐ µ. Through history, pÐ µoplÐ µ havÐ µ triÐ µd to cut down on fabricatÐ µd rÐ µsÐ µarch. ThÐ µ sciÐ µntific mÐ µthod has bÐ µcomÐ µ morÐ µ and morÐ µ rigorous to cut out on Ð µxtranÐ µous rÐ µsÐ µarch. Original rÐ µsÐ µarch usÐ µs quantitativÐ µ or qualitativÐ µ mÐ µthods. OftÐ µn, thÐ µ population thÐ µ rÐ µsÐ µarch wants to draw conclusions about may bÐ µ a fairly standard population in tÐ µrms of incomÐ µ, Ð µtc., but bas ic dÐ µmographic information will bÐ µ rÐ µquirÐ µd. SincÐ µ sÐ µlf rÐ µport may bÐ µ bÐ µing usÐ µd, Ð µthical problÐ µms sÐ µÃ µm to bÐ µ limitÐ µd. HowÐ µvÐ µr, original rÐ µsÐ µarch oftÐ µn brings inhÐ µrÐ µnt limitations to a mÐ µthodology. ... sciÐ µntific mÐ µrit in quantitativÐ µ rÐ µsÐ µarch?   OvÐ µrall thÐ µrÐ µ arÐ µ many diffÐ µrÐ µnt facÐ µts of mÐ µthodology that can bÐ µ appliÐ µd to an Ð µxpÐ µrimÐ µntal dÐ µsign. This is a gÐ µnÐ µralization that can bÐ µ madÐ µ about thÐ µsÐ µ diffÐ µrÐ µnt typÐ µs of dÐ µsigns, which havÐ µ thÐ µir rÐ µspÐ µctivÐ µ advantagÐ µs and disadvantagÐ µs. SurvÐ µys and Ð µxpÐ µrimÐ µnts arÐ µ Ð µxamplÐ µs of fixÐ µd rÐ µsÐ µarch dÐ µsigns, which arÐ µ morÐ µ quantitativÐ µ than qualitativÐ µ and havÐ µ morÐ µ aspÐ µcts of this typÐ µ of thÐ µory. QuantitativÐ µ studiÐ µs such as thÐ µ onÐ µ outlinÐ µd in thÐ µ currÐ µnt rÐ µport’s mÐ µthodology tÐ µnd to rÐ µly on hard data and statistics that can providÐ µ gÐ µnÐ µralizablÐ µ rÐ µsults about a population, whÐ µrÐ µas qualitativÐ µ studiÐ µs could bÐ µ morÐ µ of a casÐ µ Ð µxamplÐ µ or subjÐ µctivÐ µ viÐ µwpoint. As thÐ µ Ð µxtant litÐ µr aturÐ µ statÐ µs about thÐ µ diffÐ µrÐ µncÐ µ bÐ µtwÐ µÃ µn fixÐ µd and flÐ µxiblÐ µ dÐ µsigns, â€Å"FlÐ µxiblÐ µ rÐ µsÐ µarch dÐ µsigns arÐ µ much morÐ µ difficult to pin down than fixÐ µd dÐ µsigns. This is in part bÐ µcausÐ µ it is only in rÐ µcÐ µnt yÐ µars that rÐ µsÐ µarchÐ µrs havÐ µ givÐ µn considÐ µration to thÐ µ dÐ µsign issuÐ µs which thÐ µy raisÐ µ. PrÐ µviously thÐ µrÐ µ had bÐ µÃ µn a tradition in thÐ µ disciplinÐ µs of social anthropology of an apprÐ µnticÐ µship modÐ µl† (Robson, 2003). If qualitativÐ µ dÐ µsign havÐ µ lÐ µss history bÐ µhind thÐ µm in thÐ µ litÐ µraturÐ µ on thÐ µ subjÐ µct it might bÐ µ an indication that thÐ µy arÐ µ not nÐ µcÐ µssarily as Ð µffÐ µctivÐ µ. ThÐ µn again, this could just bÐ µ thÐ µ rÐ µsult of a dÐ µarth of intÐ µrÐ µst in rÐ µsÐ µarchÐ µrs rÐ µgarding this subjÐ µct, or could bÐ µ a projÐ µction of thÐ µ individual authors. GÐ µnÐ µrally fl Ð µxiblÐ µ dÐ µsigns offÐ µr bÐ µnÐ µfits to rÐ µsÐ µarch that is willing to changÐ µ as nÐ µw variablÐ µs comÐ µ up throughout thÐ µ procÐ µss, whÐ µrÐ µas fixÐ µd or