An Introduction to Economics

Experimental Techniques For The Synthesis And...

CHAPTER 2 EXPERIMENTAL TECHNIQUES FOR THE SYNTHESIS AND CHARACTERIZATION OF NANOMATERIALS. In order to explore novel physical properties and phenomena and realize potential applications of nanostructures and nanomaterials, the ability to fabricate and process nanomaterials and nanostructures is the first corner stone in nanotechnology. There exist a number of methods to synthesize the nanomaterials, which are categorized in two techniques â€Å"top down and bottom up†. Solid state route, ball milling comes in the category of top down approach, while wet chemical routes like sol-gel, co-precipitation, etc. come in the category of bottom up approach. Secondly, characterization of nanomaterials is necessary to analyze their various properties. Therefore, this chapter describes the various methods of synthesis and characterization of nanomaterials. Characterization techniques include XRD, SEM, TEM, EDAX, UV-Visible spectroscopy, FTIR spectroscopy, etc. 2.2. Synthesis of Nanomaterials: Fabrication of nanomaterials with strict control over size, shape, and crystalline structure has become very important for the applications of nanotechnology in numerous fields including catalysis, medicine, and electronics. Synthesis methods for nanoparticles are typically grouped into two categories: â€Å"top-down† and â€Å"bottom-up† approach. The first involves the division of a massive solid into smaller and smaller portions, successively reaching to nanometer size. This approach may involve milling orShow MoreRelatedExperimental Investigation on Zirconium Oxide with Engine Oil 20W401534 Words   |  7 Pagesincreasing availability of methods, synthesis of nanomaterials as well as tools of characterization and manipulation. Nanotechnology makes us to believe that we would have the ability to create anything that we could precisely define. Synthesis of nanomaterials is another key issue. General approaches in synthesizing nanomaterials involve vapour, liquid or solid state routes or their intelligent combinations. Size effects are an essential aspect of nanomaterials. Size effects are of two types: oneRead MoreIs Nanotechnology A Field Of Applied Science?7916 Words   |  32 PagesChapter 1 Introduction 1.1 Background Nanotechnology is a field of applied science, focused on the design, synthesis, characterization and application of materials and devices at the nanoscale. This is an emerging field which plays a major role in the development of innovative methods to produce new products. Because of its greater role in enhancing the performance of several existing technologies, it is gaining high attention. Properties of materials often change dramatically when size reducesRead MorePreparation Of A Innovative Mixed Matrix Polyethersulfone Membranes By Inserting Graphene Oxide Nanosheets For Wastewater Purification Essay1505 Words   |  7 Pagesmembrane to be either hydrophobic or hydrophilic and also change the surface charge of membrane to be either electropositive or electronegative, changing operating conditions, and periodic cleaning . Generally, Ultrafiltration (UF) is a widely used technique in the treatment wastewater.. Asymmetric UF membranes can be prepared using a range of suitable polymers, including polysulfone (PSf), polyethersulfone (PES), poly(aryleneethersulfone) block copolymer, cellulose acetate (CA),polyetherimide(PEI),polyimide(PI)Read MoreThe Doping Of Semiconductor By Rare Earth Metal Nanoparticle1754 Words   |  8 Pagesgel-combustion method. It was found that La can greatly enhance the cytotoxicity and photocatalytic activity of ZnO nanoparticles towards various cell lines and paracetamol drug. These nanoparticles were characterized by various spectroscopic and other techniques which clearly revealed the presence of lanthanum ions. The absorption edge shifts towards the visible region after doping with La ions. This shift shows that the doping of La ions is favorable for absorbing the visible light. The comparative photocatalyticRead MoreTitanium Cerium Ferrite ( Tcf ) Was Prepared By A Simple Solvothermal Method5630 Words   |  23 Pagesfriendly, simple and effective method for uranium (VI) removal from wastewaters. However, the separation process of adsorbents from aqueous solution after saturated sorption is usually complex and time-consuming. To overcome this difficulty, nanomaterials have been concerned among the scientists and researchers because these materials possess high specific surface areas, plentiful functional groups and abundant sorption sites on their surfaces [magnetic graphene/iron oxides]. ManyRead MoreModeling Of Engineering And Biomedical Sciences9738 Words   |  39 Pagesmechanical properties, thermal conductivity and electrically insulating property, boron nitride nanotubes and nanosheets have promising applications in the field of engineering and biomedical sciences. Accurate modeling of failure or fracture in a nanomaterials inherently involves coupling of atomic domains of crack, voids as well as deformation mechanism ori ginating from grain boundaries. This review highlights the recent progress made in the atomistic modeling of boron nitride nanofillers. Continuous

What Can Parents Do to Protect Children from the Bad Influence of Television Violence Free Essays

Television can be a powerful influence in developing value systems and shaping behavior in the developing children’s mind. Unfortunately, much of today’s television programming has a highly explicit violent content. Numerous studies has been conducted on the effect television violence has on children and adolescence, and all of it shows negative feedbacks. We will write a custom essay sample on What Can Parents Do to Protect Children from the Bad Influence of Television Violence? or any similar topic only for you Order Now Children tend to develop emotional numbness to all the horror seen on the screen, and gradually accept violence as a norm and a way to solve problems. Parents can protect their children by engaging them in different after school programs, paying attention to the television their children are watching and try to block some channels showing inappropriate content. One of the most disturbing facts of modern life is the abundance of wasted time spent watching mindless television programs. Children who spend more time in front of the television are more susceptible to all the violence in the media, and not only that they grow to be more aggressive, but also more passive. One way to avoid that is to involve the kid into different after school activities like arts and crafts programs or outdoor sports. Extracurriculars let the children enjoy themselves in a fun, stress-free environment, get some exercises, and make friends outside of school instead of being trapped at home alone with the only source of entertainment, the TV. It is a proven fact that television and media content are affecting how children and teens perceive the world around them. One way to help ease the negative effect of it is to help them understand what is wrong and what not. Parents should be aware of what children are watching, and if there is something violent and upset them, it is important to help them through that. Although the violent content, television can offer some very valuable educational programs as well, which could open doors to new fields of knowledge, when viewed responsible and sensibly. That is why parents should not eliminate the television, just get involved into what the child is watching, and explain why violent and the explicit is not worth watching. Parents can not control what children are doing, or watching every second of the day, that is why many parents rely on some sort of channel blockers. By restricting access to certain channels with violent and explicit language, parents can keep the unwanted content away from the eyes of their children. Childproofing the cable television is one of the best ways to keep the kids away of television violence, but yet it does not guarantee that the kids are protected. The control of the parents over their viewing time and content is most important of all. Television has become more violent in content in the recent years. Although the media experts are trying to market the explicit content, there are still should be some limits and restriction on what has to be shown on the big screen and what not. Until that happens, parents are the only regulators of that content and as so, they have the right to rule the remote control in their living room. How to cite What Can Parents Do to Protect Children from the Bad Influence of Television Violence?, Papers

Crash Directed by Paul Haggis Essay Example For Students

Crash Directed by Paul Haggis Essay Crash, directed by Paul Haggis, is a movie that not only contained tons of racism, but a lot of communication and miscommunication. This movie is different from other movies with racism, because the film is very impartial about the issue. Rather then separating the characters into victims and offenders, victims of racism are often racist themselves in different situations and contexts. Everyone came from a different scenario, but they were all linked together by stories of race, loss, and redemption. There were many different instances in which there was a miscommunication between two or more people. One instance, was towards the end of the movie. Officer Hansen was diving in his own car down the road, and saw a black man. He picked him up because he needed a ride. They talked for awhile, but Officer Hansen thought the man was making fun of him. He told the man to get out of the car, and the black man wasnt happy. The man went to show what he was laughing at, so he went into his pocket. The officer thought he was pulling out a gun, so he quickly pulled out his and shot the man to death. The officer thought just because the man was black, that he was going to pull out a gun in anger and shoot. In reality, all the man was really going to do is show the officer what he was laughing at, which was that he and the officer both had the same statue. The officer felt really guilty and scared, so he left the man behind and took off. Another instance, was when Officer John Ryan needed help for his dad so his dad can get his urinary track infection fixed. The officer spoke to Shaniqua Johnson about getting insurance to cover his dad in case his dad had a problem with his prostate. Officer John Ryan was very racist towards Shaniqua, saying that there were five other good white doctors that could of done a better job then her. Shaniqua denied the Officers request because his racism got in the way of what he really wanted for his dad. The miscommunication was that the officer didnt know how to express what he really wanted without being racist and angry and this in turn, made him get turned away from getting help for his dad. If the officer calmed down a little in the beginning, or wasnt as mean to the doctor about her race, the doctor might of considered helping the officer out with what his dad needed. In conclusion, there were many instances of communication and miscommunication throughout this movie, even though Ive only listed two of them. The movie seemed to have taken place when it was made, but its possible it could have been in the 90s. This movie was very confusing for me and might have been a little over my head. I didnt seem to understand the ending, or why certain things happened and didnt happen. Overall, I still liked the movie, and would recommend it to all most anyone my age or higher, because of the language that was used in the movie. I might re-watch it again in the future.