LEDs are so popular because they are super-efficient, converting electricity directly into light. The first visible-light LEDs were invented in the early 1960s when researchers at General Electric discovered the unique properties of diodes made with various gallium alloys (combinations of gallium, ...
Aluminum alloys play an important role in circular metallurgy due to their good recyclability and 95% energy gain when made from scrap. Their low density and high strength translate linearly to lower greenhouse gas emissions in transportation, and their
the results of the DSC tests on the aged samples of the ternary alloys should only show the isolated heat effects for the formation of the Mg6Ca2Zn3 phase and its precursors. 正在翻译,请等待... [] aWhy do always haveinexplicable misunderstanding 为什么我们总有莫名的误解 [translate] ...
Global distributions of UV-absorbing aerosols are obtained using measured differences between the 340 and the 380 nm radiances from the Nimbus 7 Total Ozon... JR Herman,PK Bhartia,O Torres,... - 《Journal of Geophysical Research Atmospheres》 被引量: 2351发表: 1997年 Characteristics of grey ...
What are metal alloys? Identify the two main types of alloys, and describe how their structures differ. Give several examples of each type of alloy. What is the main difference in the physical properties of metals and non-metals? Describe a compound that demonstrates Boron's non-m...
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b Average hydrogen content (solid square) from measurements obtained for three constant ramping rates of 800, 1000, and 1200 °C/h. These values are denoted as ‘Ramping’. The corresponding error bars represent the standard deviation from the three measurements. The figure shows for reference...
avital signs are obtained vital signs are obtained [translate] a目前,一些国家货币汇率经常动荡不定,国际金融市场变幻莫测,外汇风险对持有外汇的个人来说,常造成损失,因此,防范外汇风险对个人,特别是对外贸企业来讲已成为重要问题。 At present, some national currency exchange rate frequently is unstable, the ...
aZinc alloys are mainly used for high production where a large number of identical electrodes are required which can be produced by pressure die-casting or coining. Complex shapes of electrodes can be easily diecast compared to machining used with other electrodes. The cost of the electrodes is ...
First, the current energy density limit of liquid lithium-ion batteries is about 280Wh/kg. Even if silicon-based alloys are introduced into the negative electrode, it is difficult to break through the upper density limit of 400Wh/kg.