Monday, January 27, 2020

Curvature of the Universe: Analysis

Curvature of the Universe: Analysis Introduction 1.1 Reviewing of General Relativity 1.1.1 Metric Tensor The equation which describes the relationship between two given points is called metric and is given by Where interval of space-time between two neighboring points, connects these two points and are the components of contra variant vector. Through the function, any displacement between two points is dependent on the position of them in coordinate system. The displacement between two points in rectangular coordinates system is independent of their components due to homogeneity, so metric is given by Where are the space-time coordinates, is speed of light and is metric for this case and is given by Through the coordinates transformation from rectangular coordinates,, to curved coordinates system the components ofin a curved coordinates system can be found . For constructing rectangular coordinates system in a curved coordinates if space-time is locally flat then it is possible to that locally. From rectangular coordinates system defined locally in a point of a curved space-time to a curved coordinates system can be written as So in this way we can find local values of metric tensor Three important properties of metric tensor are: is symmetric so we have metric tensors are used to lowering or raising indices 1.1.2 Riemann Tensor, Ricci Tensor, Ricci Scalar The tool which plays an important role in identifying the geometric properties of spacetime is Riemann (Curvature) tensor. In terms of Christoffel symbols it is defined as: Where .If the Riemann Tensor vanishes everywhere then the spacetime is considered to be flat. In term of spacetime metric Riemann Tensor can also be written as: thus useful symmetries of the Riemann Tenser are: so due to above symmetries, the Riemann tensor in four dimensional spacetime has only 20 independent components. Now simply contracting the Riemann Tensor over two of the indices we get Ricci Tensor as: above equation is symmetric so it has at most 10 independent components. Now contracting over remaining two indices we get scalar known as Ricci Scalar. Another important symmetry of Riemann Tensor is Bianchi identities This after contracting leads to 1.1.3 Einstein Equation The Einstein equation is the equation of motion for the metric in general theory of relativity is given by: Where is stress energy momentum tensor and is Newton’s constant of Gravitation. Thus the left hand side of this equation measures the curvature of spacetime while the right hand side measures the energy and momentum contained in it.Taking trace of both sides of above equation we obtain using this equation in eq. ( ), we get In vacuum so for this case Einstein equation is We define the Einstein tensor by Taking divergence of above eq. we get 1.1.4 Conservation Equations for Energy momentum Tensor In general relativity two types of momentum-energy tensor,are commonly used: dust and perfect fluid. 1.4.1 Dust: It is simplest possible energy-momentum tensor and is given by The 4-velocity vector for commoving observer is given by, so energy momentum tensor is given by It is an approximation,of the universe at later times when radiation is negligible 1.4.2 Perfect fluid: If there is no heat conduction and viscosity then such type of fluid is perfect fluid and parameterized by its mass density and pressure and is given by It is an approximation of the universe at earlier times when radiation dominates so conservation equations for energy momentum tensor are given by In Minkowski metric it becomes 1.1.5 Evolution of Energy-Momentum Tensor with Time We can use eq. () to determine how components pf energy-momentum tensor evolved with time. The mixed energy-momentum tensor is given by: and its conservation is given by Consider component: Now all non-diagonal terms of vanish because of isotropy so in the first term and in the second term so For a flat, homogeneous and isotropic spacetime which is expanding in its spatial coordinate’s by a scale factor, the metric tensor is obtained from Minkowski metric is given by: The Christoffel symbol by definition Because Because the only non-zero is so from eq. () conservation law in expanding universe becomes after solving above equations we get above equation is used to find out for both matter and radiation scale with expansion. In case of dust approximation we have so So energy-density of matter scale varies as .Now the total amount of matter is conserved but volume of the universe goes as so In case of radiation so from eq.() we obtain Which implies that, science energy density is directly proportional to the energy per particle and inversely proportional to the volume, that is, because so the energy per particle decreases as the universe expands. 1.2 Cosmology In physical cosmology, the cosmological rule is a suspicion, or living up to expectations theory, about the expansive scale structure of the universe. Throughout the time of Copernicus, much data were not accessible for the universe with the exception of Earth, few stars and planets so he expected that the universe might be same from all different planets likewise as it looked from the Earth. It suggests isotropy of the universe at all focuses. Once more, a space which is isotropic at all focuses, is likewise homogeneous. Copernicus rule and this result about homogeneity makes the Cosmological rule (CP) which states that, at a one-time, universe is homogeneous and isotropic. General covariance ensures validity of Cosmological Principle at other times also. 1.2.1 Cosmological metric: Think about a 3D circle inserted in a 4d hyperspace: where is the radius of the 3D sphere. The distance between two points in 4D space is given by solving we get now becomes In spherical coordinates Finally we obtain We could also have a saddle with or a flat space. In literature shorthanded notation is adapted: To isolate time-dependent term, make the following situation: Then where If we introduce conformal time (arc parameter measure of time) as then we can express the 4D line element in term of FRW metric: 1.2.2 Friedmann Equation: We can now figure out Einstein field mathematical statement for perfect fluid. All the calculations are carried out in comoving frame where and energy-momentum tensor is given by Raising the index of the Einstein tensor equation we get After contracting over indices and we get so Einstein’s Equation can be written as It is easily found for perfect fluid finally we obtain the components of Ricci tenser The components are and components are To get a closed system of equations, we need a relationship of equation states which relates and so solving At this point when we joined together with equation 62 comparisons in the connection of energy-momentum tensor and the equation of states, we get a closed frame work of Friedmann equations: 1.2.3 Solutions of Friedmann Equations: We are going to comprehend Friedmann equation for the matter dominated and radiation dominated universe and get the manifestation of scale factor. From the definition of Hubble’s law Matter Dominated Universe: : It is showed by dust approximation As both and, for flat universe (), ( an) for . When combined with equation, this yields critical density Currently it value is (we used).The quantity provide relationship between the density of the universe and the critical density so it is given by Now the second Friedmann equation for matter dominated Universe becomes so lastly Radiation-dominated Universe: It is showed by perfect fluid approximation with The second Friedmann Equation becomes Flat Universe Matter Dominated Universe (dust approximation) The first Friedmann equation becomes At the Big bang Using convention and universe flat condition we finally get Now we can calculate the age of universe, which corresponds to the Hubble rate and scale factor to be: Taking and we get Years Radiation-dominated: The First Friedmann equation becomes At the big bang and .Also we have Closed Universe Matter-dominated The first Equation becomes In term of conformal time we can rewrite the above integral as After substituting and using equation Then but we have so we get . Now but we have at sets. So we have now the dependence of scale factor in term of the time parameterized by the conformal time as Radiation-dominated Universe: The first Friedmann equation becomes In term of conformal time we can re write the integral as but we have conditions at sets so we get and the requirement at sets , finally we have Open Universe Matter-dominated (dust approximation): The first Friedmann equation In term of conformal time we can rewrite the integral as Take

Sunday, January 19, 2020

Presumed Innocent

Entertainment has always consisted of law related movies. Legal movies are successful because of public interest in different types of legal cases and scenarios. An example of a successful legal movie is Presumed Innocent. The movie Presumed Innocent was produced in 1990. The movie stars Harrison Ford who plays Rusty Sabich, a prosecutor and right hand man of the district attorney Raymond Horgan. Rusty’s colleague Carolyn Polhemus is found dead in her apartment. She was said to be raped and murdered. Raymond puts Rusty in charge of her investigation.It is later exposed that Rusty has a previous affair with Carolyn Polhemus but made up with his wife. Polhemus dumped Rusty. At this time of the investigation, Horgan is undergoing a political campaign in order to keep his job. It turns out that Horgan loses the election to Nico Della Guardia. Along with Della Guardia comes his deputy, Tommy Molto. Della Guardia and Molto prosecute Rusty for Carolyn’s murder because of his f ormer affair with her. Sandy Stern becomes Rusty’s defense lawyer in the murder trial. The investigation by the defense team leads to the idea that Rusty was framed for Carolyn’s murder.The person of interest for the framing is Molto who wanted Rusty’s job (O’Cain). Della Guardia and Molto immediately gather evidence against Rusty. They find a beer glass with Rusty’s fingerprints on it in Polhemus’ apartment. This piece of evidence causes a lot of controversy throughout the trial. It is revealed that the beer glass is missing from the evidence room. Rusty discovers that Polhemus acquired a bribery file (B file) from Horgan. There was a case involving a man named Leon who paid $1,500 to get his case thrown out of court. It turns out that Polhemus was the one who set up the bribe.Rusty and Stern’s defense is that Della Guardia and Molto set up Rusty as part of a cover-up of a bribery case involving Molto. Stern never allows Rusty to tes tify throughout the trial because it might lead the jury to think he is guilty. The trial ends with Judge Lyttle dismissing the case because of a lack of physical evidence. Rusty is not guilty for the rape and murder of Polhemus. At the end of the movie, Rusty finds a hammer in the basement with blood on it. His wife confesses to killing Polhemus. The legal issues in Presumed Innocent include conflict of interests.Rusty faces a conflict of interest because he had an affair with Polhemus. They were once lovers and very intimate with each other. Then he becomes part of the case that is investigating her death. It was suspenseful while watching the trial knowing that Rusty and Polhemus had a secret affair that only Rusty and his wife knew about. If the news of this affair was brought out into the open the trial might not have been dismissed so easily. Because of the intimacy that Rusty and Polhemus shared at one point, there would be more suspicion towards him being charged for the rap e and death.When a defendant has this type of relationship with a victim usually there is more questioning of the ex-lover due to shared intimacy and possible attachment. Although it turns out that Rusty is not guilty of her death, it seems like he dodged some bullets as the previous affair was never taken into account. There could have been a lot more accusations if the affair was made public. Dismissing the case because of lack of physical evidence seems to be very realistic. It is understandable that without physical proof, Judge Lyttle is not able to make accurate rulings.A part of the movie that was very impressive was basically the last hour when the trial began. The trial felt very serious and real. It was easy to follow the cross examinations and the lawyers were acted out very well. Another aspect of the movie that was impressive was the flashbacks to Rusty and Polhemus’ relationship. It was very interesting to see how their relationship was and how they acted in fro nt of each other. At some points I had emotional connections to Polhemus and I genuinely felt bad about her death.She seemed to be a hard worker and the way she treated the young boy testifying against his mother in the beginning of the movie was touching. She seemed to be very caring and she wanted what was best for the young boy. Watching her interact with him was the first time that I felt very sorry for her vicious death. Another impressive part about the movie is that there was constant suspense as to whether Rusty would be found guilty or not guilty. The trial keeps you curious and anxious to find out the results.The relationships between all of the characters were also impressive especially Polhemus, Judge Lyttle, and Leon. It was shocking to find out that Polhemus set up the bribe for Leon and that Judge who took the money was actually the same Judge in Polhemus’ murder trial. The least impressive part of the movie was the way that it ended. It was clever to end the m ovie with Rusty’s wife confessing to the murder but personally, it seems that justice is not served for Polhemus. Polhemus’ murder went down as an unsolved case but now the viewer knows how it could be solved.It is understandable that the movie ends with a twist but there is no justice for Polhemus. Rusty’s wife gets to be a free woman and bears no legal consequences for murdering Polhemus. His wife would always nag Rusty about his ongoing obsession with Polhemus even though she was dead. Although it is terrible to cheat on a partner, it is not acceptable for Rusty’s wife to kill Polhemus in response to the affair. Any sympathy that I had for Rusty’s wife was dismissed at the end of the movie. There are many positive and negative aspects of the legal system in this movie.An example of a positive aspect acted out by the legal system illustrated in the movie is Judge Lyttle dismissing the case due to lack of clear evidence. It is common knowledge tha t there needs to be evident information to make a judgment but in the movie, Judge Lyttle may have dismissed the case very easily due to other factors. He was influenced by his participation in the missing B-file case. The B-file illustrated that he accepted bribes from Leon and he was probably nervous that the B-file might turn up somewhere. If the file was to show up, his career would be negatively impacted especially because he is a Judge.This example illustrates the corruption that could exist in the legal system that no one would find out about. It seems that Judge Lyttle used his powers to his own advantage to protect himself from being caught. Also, Stern and Horgan knew that Judge Lyttle was accepting bribes from Leon but Horgan was the one who gave the Judge a second chance. Average people may never be aware of this type of corruption that may occur in the legal system. In the beginning of the movie there is also political corruption within the legal system.Horgan puts Rust y in charge of the Polhemus case but then turns against him. Horgan claims that Rusty insisted on handling the case which makes it seem like Rusty might be covering up something. Watching law related movies can teach the public a lot about the legal system. Presumed Innocent illustrates the controversy of conflict of interests and some of the corruption that may take place within an investigation. Work Cited 1. O'Cain, Derek. â€Å"Presumed Innocent (1990) – Plot Summary. †Ã‚  The Internet Movie Database (IMDb). Web. 18 Feb. 2012. ;http://www. imdb. com/title/tt0100404/plotsummary;

Saturday, January 11, 2020

An Intro To Psychology Architecture Essay

The term Hypnosis comes from the Grecian ‘ypnos ‘ which means sleep because of the Trance State. However Hypnosis is non sleep because the topic stays qui vive, can speak and travel, and the encephalon moving ridges differ ( What is Hypnosis, n.d. ) . In modern yearss Hypnosis has been used for a figure of grounds. Some people try to halt smoke, loose weight, drug dependence and alcohol addiction Bi Polar upset, ADHD, and schizophrenic disorder, and stress management.A As you can see Hypnosis can and is being used in all sorts of signifiers. For several decennaries, or even centuries, hypnosis was more seen as a circus or charming act. Because of this it has taken for a while to convert the populace that it besides has its practical utilizations. As to the history of hypnosis, the usage of it can be dated back all the manner to the early ages of civilisation. In ancient times, worlds used it for mending intents, particularly in spiritual ceremonials. For illustration, an Indian priest-doctors entered into a procedure of strong visual image and suggestion during which he willed to mend the ill individual. The first modern type of hypnosis started with carnal hypnosis. In 1600-s husbandmans calmed poulets hypnotically by utilizing different methods. In 1800-s people hypnotized birds, coneies, toads and other animate beings. B. Danilewsky experimented with carnal hypnosis and studied its physiological workings in animate beings ( Hypnosis Black Secrets, n.d. ) . The first individual to look into this portion of psychological science was Franz Anton Mesmer ( 1734-1815 ) , an Austrian doctor, who is widely acknowledged as the ‘Father of Hypnosis ‘ . Franz believed that there was a quasi-magnetic fluid in the really air that we breathe and that the organic structure ‘s ‘ nervousnesss someway absorbed this fluid. He cured most of his patients by using magnets to different parts of the organic structure to alter the magnetic flows of the organic structure ( Mark, R. 2002 ) . He was the sire of all major scientists who studied Hypnosis after him, for illustration Marquis de Puysegur and Dr. John Elliotson. Now that we know a small spot about how Hypnosis started, allow ‘s happen out what hypnosis is? Harmonizing to the Encyclopedia Britannica: â€Å" Hypnosis is a particular psychological province with certain physiological properties, resembling slumber merely superficially and marked by a operation of the person at a degree of consciousness other than the ordinary witting province. This province is characterized by a grade of increased receptivity and reactivity in which interior experiential perceptual experiences are given as much significance as is by and large given merely to external world ( Encyclopedia Britannica, n.d. ) . This brings us to the following inquiry, what is hypnosis used for? A better inquiry would really be what ca n't Hypnosis be used for? A Hypnosis, today, is being used for multiple jobs. Some of the more common 1s would be people who try to halt smoke, others who would wish to lose weight and have tried everything else and it did n't work. Some us hypnosis to cover with emphasis related jobs. These would be the more normally know countries hypnosis is used for. Other less known countries hypnosis can be used for would be in assisting epilepsy patients and patients with palsy, Multiple induration, AIDS and malignant neoplastic disease. Hypnosis can in some of these instances help to better the quality of life and in some instances assist in easing a remedy. The most of import portion of this side of Hypnosis is to retrieve that merely people with a grade in medical specialty should pattern hypnosis for these sorts of jobs. An exclusion might be that doctors will give you a referral to a hypnotizer, who is really good reversed it what you need him to make. Hypnosis has besides been known Os have been applied for child birth conditioning and of class the benefits are enhanced if they are used in combination with La Maze take a breathing techniques. There are besides experts who utilize hypnosis for drug dependence and alcohol addiction, these experts are familiar with the 12 stairss of AA and Al-anon and hold pattern in the 12 measure plans and cognize how to utilize hypnosis to assist their clients. Other experts employ hypnosis to assist adult females with the symptoms of PMS ( premenstrual emphasis ) and other hormone related wellness upsets. Hypnosis besides has been found to assist people with ADHD and schizophrenic disorder and bi-polar ( Watkins, 2008 ) . Another particular signifier of hypnosis-called wakened hypnosis — is most effectual for covering with anxiousness panic onslaught. Hypnosis – Hypnosis is sometimes used in combination with cognitive-behavioral therapy for anxiousness. While you ‘re in a province of deep relaxation, the hypnotherapist uses different curative techniques to assist you confront your frights and expression at them in new ways ( Anxiety Attacks and Disorders, n.d. ) . Last but non least, and likely one of the most known utilizations for hypnosis, is to utilize it for diging into repressed kid goon memories. Clinical hypnosis can be used to get the better of many of the clients mental and wellness jobs by theoretically turn uping the beginning of the job in their childhood. This pattern of hypnosis has come under fire recently, some statements made by people that underwent hypnosis to bring out pent-up kid goon memories were really used for cases against parents, siblings and other household members. After long probes most of these instances nil more than person ‘s purportedly long-repressed memories that all of a sudden surfaced under therapy. After reexamining 60 old ages of research and happening no controlled research lab support for the construct of repression, a good known research worker D.S. Holmes suggested, merely half jestingly, that any usage of the construct be preceded by a warning: â€Å" Warning. The construct of repression h as non been validated with experimental research and its usage may be risky to the accurate reading of clinical behaviour † ( Holmes, 1990 ) Ricker, n.d. ) . Defense judicial proceeding in such instances of hypnosis has raised improperness and incompetence on the portion of the healer or practician utilizing hypnosis and/or implicative techniques to retrieve â€Å" repressed † memories which false lead the client to believe that their current symptoms are due to being sexual abused as a kid ( Hansen, 1996 ) . There have been besides studies of tooth doctor utilizing hypnosis during dental surgery to wipe out the hurting. Another usage of hypnosis is called Self-hypnosis, this happens when you hypnotize yourself. This is frequently more practical as a emphasis direction tool than normal hypnosis, as you do non necessitate to hold a hypnotist nowadays. Self hypnosis works reasonably much the same manner as speculation, it helps you loosen up and deflect your head from unpleasant ideas. Together with speculation and imagination, self hypnosis can be a powerful tool to battle day-to-day emphasis and go a portion of a day-to-day emphasis direction modus operandi ( Self Hypnosis, n.d. ) . In decision, as you can see hypnosis can successfully be used for every conceivable job that can problem worlds. In this essay I touched on merely a few utilizations of Hypnosis, the more common 1s like childhood repressed memories, halt smoke, weight loss and stress direction and some of the lesser known 1s like hurting control and child birth. There are likely many more utilizations for hypnosis to be discovered we have n't thought of yet.MentionsAnxiety Attacks and Disorders: Signs, symptoms, and intervention. ( n.d. ) .Helpguide.org: Understand, prevent and decide life ‘s challenges. Retrieved April 7, 2010, from hypertext transfer protocol: //helpguide.org/mental/anxiety_types_symptoms_treatment.htm Hansen, J. , & A ; R.H.A.. ( 1996 ) . Hypnosis – controversial once more.The Ross Institute Internet Archives for the Study of Destructive Cults, Controversial Groups and Motions. Retrieved April 7, 2010, from hypertext transfer protocol: //www.rickross.com /reference/ false_memories/fsm25.html History of Hypnosis: from antediluvian times to modern hypnosis. ( n.d. ) .Hypnosis and self hypnosis secrets -learn hypnosis online. Retrieved April 7, 2010, from hypertext transfer protocol: //www.hypnosisblacksecrets.com/learn-hypnosis/history-of-hypnosis-from-ancient-times-to-nowadays Ibadov, O. ( n.d. ) . History of Hypnosis: From priest-doctors to instant hypnosis.Self Improvement from SelfGrowth.com. Retrieved April 7, 2010, from hypertext transfer protocol: //www.selfgrowth.com /articles/ History_of_Hypnosis_From_Shamans_to_Instant_Hypnosis.html Mark, R. ( 2002 ) Hypnosis ( psychological science ) — Britannica Online Encyclopedia. ( n.d. ) .Encyclopedia – Britannica Online Encyclopedia. Retrieved April 7, 2010, from hypertext transfer protocol: //www.britannica.com/EBchecked/topic/279820/hypnosis Ricker, J. , & A ; Ph.D.. ( n.d. ) . Section 6-16: What are false memories? .Scottsdale Community College. Retrieved April 7, 2010, from hypertext transfer protocol: //www.scottsdalecc.edu/ricker/psy101/readings/Section_6/6-16.html Self-Hypnosis – Relaxation Techniques from Mind Tools. ( n.d. ) .Mind tools – direction preparation, leading preparation and calling raining – right here, right now.. Retrieved April 7, 2010, from hypertext transfer protocol: //www.mindtools.com/stress/RelaxationTechniques/SelfHypnosis.htm The history of hypnosis.Essortment Articles: Free online articles on wellness, scientific discipline, instruction & A ; more... Retrieved April 7, 2010, from hypertext transfer protocol: //www.essortment.com/all/hypnosishistory_rcdg.htm Watkins, C. ( 2008 ) . Hypnotherapy.Northern County Psychiatric Associates Home Page. Retrieved April 7, 2010, from hypertext transfer protocol: //www.ncpamd.com/medical_hypnosis.htm What Is Hypnosis – Toronto Naturopathic Clinic. ( n.d. ) .Toronto Naturopathic Clinic – Toronto Naturopath Sushma Shah ND ( Yonge & A ; Davisville ). Retrieved April 7, 2010, from hypertext transfer protocol: //www.naturesintentionsnaturopathy.com/hypnosis.htm

Thursday, January 2, 2020

Pros and Cons of School Uniforms

They come in soft yellow polo shirts. They come in white blouses. They come in plaid skirts or jumpers. They come in pleated pants, navy or khaki. They are all made of durable fabric. They come in all sizes. They are school uniforms. And despite their name,  uniform, which means remaining the same in all cases and at all times, school uniforms can still look different from one student to another. Over the past twenty years, school uniforms have become a big business. The Statistic Brain Website (2017) counts that 23% of all public and private schools have a uniform policy. That means there are annual school uniform sales of over $1.3 million annually, with the average cost of $249/student. School Uniforms Defined Uniforms used at schools can range from the formal to the informal. Some schools that have implemented them have chosen what one usually thinks of in connection to private or parochial schools: nice trousers and white shirts for boys, jumpers and white shirts for girls. However, most public schools are turning to something more casual and more acceptable to parents and students: khakis or jeans and knit shirts of varying colors. The latter appears to be more affordable too because they can be used outside of school. Many school districts that have implemented uniforms have provided some sort of financial assistance for families that can not afford the extra expense. Pros of School Uniforms â€Å"Uniform of a soldier and uniform of a student both are equally needed for the nation.†Ã¢â‚¬â€¢Ã‚  Amit Kalantri, (author) Wealth of Words​ Some of the reason offered to support school uniforms are the following: Preventing gang colors, etc. in schoolsDecreasing violence and theft because of clothing and shoesInstilling discipline among studentsReducing need for administrators and teachers to be clothes police (for example, determining whether shorts are too short, etc.)Reducing distractions for studentsInstilling a sense of communityHelping schools recognize those who do not belong on campus The arguments for school uniforms hinge on their effectiveness in practice. Anecdotal information from administrators in schools that have implemented uniform policies point to the fact that they do have a positive effect on discipline and the school. Note that all of the following were from middle schools. In Long Beach (1995), officials found that the year after their mandatory program with parental opt-out was implemented, overall school crime decreased by 36%. More recently, a  2012  study found that after a year of having a uniform policy at a middle school in  Nevada, school police data showed a 63% decrease in police log reports. In Seattle, Washington, which has a mandatory policy with an opt-out saw a decrease in truancy and tardies. They had also not had a reported incident of theft. As a final example from Baltimore, Maryland, Rhonda Thompson, an official from a middle school that has a voluntary policy noticed a sense of seriousness about work. Whether any of these results can be directly linked to school uniforms is hard to say. However, it can be said that something has changed to make the officials take notice. We can not discount the coincidence of school uniforms with these changes either. If you would like more information about schools that have implemented uniform policies, see the Department of Educations Manual on School Uniforms. Cons of School Uniforms â€Å"[On school uniforms] Dont these schools do enough damage making all these kids think alike, now they have to make them look alike too? -George Carlin, comedian Some of the arguments made against uniforms include: Students and parents argue that uniforms violate their freedom of expression (see the next page of this article for more about what the Supreme Court has to say on this)Some students might choose to express their individuality through other means such as body piercing which is harder to regulate.Parents raise concerns about the cost.Because uniforms single out students as being from one school, this might lead to trouble with students from other schools.Families fear it might interfere with religious clothing like yarmulkes.A new policy for school uniforms can be time-consuming and difficult to enforce. There are concerns that uniforms are often associated with low-income, urban school settings. The Institute of Educational Science National Center  for Educational Statistics noted that in  2013–14: A higher percentage of schools where 76 percent or more of students were eligible for free or reduced-price lunch required school uniforms than did schools where lower percentages of students were eligible for free or reduced-price lunch. Other concerns have been raised by David L. Brunsma, an associate professor of sociology at the University of Missouri-Columbia. He analyzed data from schools nationwide, and published research with co-author, Kerry Ann Rockquemore that concluded that 10th-grade public school students who wore uniforms did no better than those who did not in attendance, behavior, or drug use. Conclusion: The effectiveness of uniforms will be a subject of continuing research as more schools look for solutions to socio-economic problems of attendance, discipline, bullying, student motivation, family engagement, or economic need.  And while a school uniform may be only a small part of the solution for all of these ills, they do solve one major issue, the dress code violation. As  Principal Rudolph Saunders  explains to Education Week (1/12/2005) that before school uniforms, â€Å"I would spend 60 to 90 minutes a day on dress-code violations. Of course, there are always those students who will try to alter a uniform for individuality. Skirts can be rolled up, pants can be dropped below the waist, and (inappropriate?) messages on T-shirts can still be read through issued button-down shirts. In short, there is no guarantee that  student wearing a school uniform will always meet the dress code standard. Supreme Court Rulings In Tinker v. Des Moines Independent Community School (1969), the court said that a students freedom of expression in school must be protected unless it would seriously interfere with the requirements of appropriate discipline. In the dissenting opinion written by Justice Hugo Black, he said, If the time has come when pupils of state-supported schools ... can defy and flout orders of school officials to keep their minds on their own schoolwork, it is the beginning of a new revolutionary era of permissiveness in this country fostered by the judiciary. Students are still protected under Tinker. However, with an increase in school violence and gang-related activities, the political climate seems to have turned more conservative, and the Supreme Court has begun to return many decisions back to the discretion of the local school board. The issue of school uniforms itself, however, has not yet been dealt with by the Supreme Court. Schools must educate students in a safe environment. Over time, education has often slipped away as the main focus of schools. As we have unfortunately seen, school safety is such an enormous issue that it is hard to come up with policies that truly work without turning a school into a prison camp. After the events at Columbine High School in 1999 where students were singled out partially for what they wore, and after numerous thefts and murders over designer shoes, it is obvious why many school districts want to institute uniforms. We must realize that learning cannot take place without some sense of decorum and discipline. Possibly instituting school uniforms might help bring back that sense of decorum and allow teachers to do what they are hired to do: teach. Parent and Student Support for Uniforms Many schools have in fact made the choice to have students wear school uniforms. Until the Supreme Court rules otherwise, this is entirely up to the school district. However, they do still have to follow state and federal anti-discrimination laws when they make their polices.Following are some ideas to make the use of uniforms easier to accept by students and parents:Make uniforms more casual - jeans and a knit shirtAllow students an outlet for their own expression: buttons to support political candidates, but not gang related paraphernaliaProvide financial assistance to those parents who can not afford the uniformsAccommodate students religious beliefs. This is required by the Religious Freedom Restoration Act.Make your program voluntary if community pressure is too largeInstitute an opt-out provision. Not including this would probably cause a court to rule against your program unless there is proof that lesser measures are ineffective.Make uniforms an integral part of the school sa fety program.