Engineering, 04.05.2020 23:01, jack104365
LONDON (Reuters) - British scientists have devised a way of using graphene, which is the thinnest material in the world, to capture and convert more light than previously, paving the way for advances in high-speed Internet and other optical communications.
In a study in the journal Nature Communication, the team -- which included last year's Nobel Prize-winning scientists Andre Geim and Kostya Novoselov -- found that by combining graphene with tiny, metallic structures, there was a 20-fold enhancement in the amount of light the graphene could capture and convert into electrical power.
Graphene is a form of carbon just one atom thick and yet 100 times stronger than steel.
"Many leading electronics companies consider graphene for the next generation of devices. This work certainly boosts graphene's chances even further," said Novoselov, a Russian-born scientist who with Geim won the 2010 Nobel Prize for physics for research work on graphene.
The researchers explained that due to unique properties of graphene, devices using it can be incredibly fast -- tens or potentially hundreds of times faster than communication rates in the fastest Internet cables currently in use.
Andrea Ferrari of Cambridge University's engineering department, who also worked on the team, said the findings show graphene's great potential in light-operated devices and in developing electronic devices that channel and control light. He said the combination of its special optical and electronic properties could be fully exploited
Which of the following statements summarizes the above article best?
A.
Engineers have found that graphene, which has been widely used in electronics for many years, degrades over time and will need to be replaced with copper.
B.
Researchers have discovered a new element called graphene, which will one day be used to build skyscrapers and advanced aircraft.
C.
A material called graphene has been proven to be stronger than steel and is now being widely used in electronic communications devices.
D.
Researchers working with the material graphene have made improvements to it that could one day lead to much faster electronic and light-operated devices.
Answers: 2
Engineering, 04.07.2019 18:10, koolgurl2003
Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.
Answers: 1
Engineering, 04.07.2019 18:10, soreese02
An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature
Answers: 2
LONDON (Reuters) - British scientists have devised a way of using graphene, which is the thinnest ma...
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