SAN FRANCISCO Nike Air Max 270 Premium Homme , June 19 (Xinhua) -- Research on heterostructuralalloys, built with materials of different structures, holds thepromise that their properties could be subject to greater controland that they could be better semiconductors.


While conventional alloys are isostructural, meaning thecompounds they consist of, known as the end members, have the samecrystal structure, heterostructural alloys are blends of compoundsmade from materials that don't share the same atom arrangement.


Structure and composition are the two means of controlling thebehavior of materials, said study co-author Janet Tate, a physicistat Oregon State University (OSU). Combining materials gives thealloy properties between those that the end members haveindividually.


"An example of an istostructural alloy is an LED," she noted,"you have a semiconductor like aluminum gallium arsenide, dope itwith a particular material and make it emit light, and change thecolor of the light by changing the relative concentration ofaluminum and gallium."


However, "if two materials have different structures, as you mixthem together it's not so clear which structure will win," Tate,who worked with collaborators and published their findings inScience Advances, was quoted as saying in a news release from OSUon Monday.


"The two together want to take different structures, and so thisis an extra way of tuning an alloy's properties, a structural way.The transition between different crystal structures provides anadditional degree of control," Tate said.


Tate and graduate student Bethany Matthews have been focusing onthe semiconductor application. "Tin sulfide is a solar cellabsorber, and the addition of calcium sulfide changes the structureand therefore the electrical properties necessary for an absorber,"Tate said.


"Combining tin sulfide with calcium sulfide makes it moreisotropic - properties being the same regardless of orientation -and that's usually a useful thing in devices."


In addition, as a result of the study, thin-film synthesisconfirmed the metastable phases of the alloys that had beenpredicted theoretically. "Many alloys are metastable, not stable -if you gave them enough time and temperature, they'd eventuallyseparate," said Tate.


"The way we make them, with pulsed laser deposition, we allowthe unstable structure to form, then suppress the decompositionpathways that would allow them to separate; we don't give themenough time to equilibrate."


Metastable materials are thermodynamically stable provided theyare not subjected to large disturbances.


"When theorists predict properties, they tend to work withmaterials that are stable," Tate said. "In general the stablecompounds are easier to attack. The idea here with heterostructuralalloys is that they give us a new handle, a new knob to turn tochange and control materials' properties."


"This is a very interesting piece of materials science thatrepresents a somewhat uncharted area and it may be the beginningsomething quite important," she said about her research supportedby the U.S. Department of Energy.


"The heterostructural alloy concept had been known before, butit's different enough that it hadn't really been explored in adetailed phase diagram - the mapping of exactly how, at whattemperature and what concentration, it goes from one structure toanother," she added. Enditem


We all have this pre-conceived notion that only coffee contains caffeine but that is not the case. Beverages like cokes and chocolate products contain caffeine. A hot cup of coffee with the morning sunshine sounds so tempting and revitalizing.


It has the ability to keep you awake and help burn that midnight oil in time of dire need. Coffee becomes a matter for social gathering. It helps you socialize by letting you bump into one of your colleagues in the office which otherwise wouldn’t have happened.


It is being considered as one of your friend as it has helped you sit up late at night and clear those grueling Math’s papers. With all the usefulness one can think of we also happen to know that coffee contains caffeine which is not good for your health.


Having coffee can help you remain alert but it is the aftermath you should be worried about the ill effects it has on your health. It is a stimulus which does wonders to your central nervous system by stressing the hormones in the blood stream and keeping you alert and awake whenever you have it.


This unnatural way of keeping your body alert takes a toll on your body. The normal way of functioning gets disrupted due to the intake of coffee or any other product which contains good amount of caffeine.


As caffeine gets into our system it makes us addicted. After knowing the ill effects of caffeine if you suddenly stop taking coffee, you will face caffeine withdrawal symptoms which can be anything from a headache, irritability, fatigue, constipation, lack of appetite, lack of concentration to even forgetfulness.


The withdrawal symptoms can be very harmful leading to stomach ulcers as the coffee can be acidic. This excess acid gets into your blood streams causing loss of calcium in urine. Caffeine which has been freely used in most of the beverages has led kids get addicted to it. The high content of sugar just makes it very popular among children which are the future generation with excess weight.


It is also the cause of abnormal fast, slow or irregular heartbeats. It is also known for increasing blood pressure which leads to constant stress and hypertension. There are increasing chances of heart disease; pancreas and bladder cancer which we all know can be very fatal.


The idea to quit caffeine should be very strong and not one to tampered with. The process should be slow and gradual. As we all know the withdrawal symptoms of caffeine is very bad. Avoid other caffeinated products which would . Cheap Jerseys Cheap NHL Jerseys Cheap NFL Jerseys Free Shipping Cheap Authentic NBA Jerseys Cheap NBA Basketball Jerseys Cheap MLB Baseball Jerseys Wholesale Jerseys Wholesale Jerseys China Wholesale Jerseys China Wholesale Jerseys China