Current Issue : July - September Volume : 2020 Issue Number : 3 Articles : 5 Articles
In recent years, wireless energy transmission technology has developed rapidly and has received increasing attention in the\nindustry. For microwave wireless energy transfer system applications, Ge Schottky diodes as the core components of the rectifier\ncircuit are commonly used. Compared with Ge semiconductor, strained Ge semiconductor on Si substrate has the advantages of\ncompatibility with Si process, low cost, and high electron mobility. It is an ideal replacement material for Ge semiconductor\napplications. In view of this, based on the model of the relationship between the performance of strained Ge semiconductor on Si\nsubstrate Schottky diodes and the geometric parameters of the device and the physical parameters of the material, Silvaco TCAD\nand ADS simulation software are jointly used to propose a novel strained Ge semiconductor on Si substrate Schottky diode for\nmicrowave rectification circuit.................................
Coal-bed methane (CBM) is a new type of clean energy, which is abundant in China. Rational development and use of CBM can\nnot only reduce the occurrence of mine disasters but also alleviate energy shortages. However, the â??high storage capacity and lowpermeabilityâ?\ncharacteristics of Chinaâ??s CBM have hindered the realization of industrialized CBM production. To study the effect\nof microwave radiation on the permeability of coal reservoirs, a seepage experiment under different stress and microwave\nradiation conditions was carried out by using the seepage experiment system of gas-bearing coal under microwave radiation\ndeveloped by the authors. The relationship among different microwave powers, different irradiation times, different energy inputs,\nand coal permeability was explored. The results show that the microwave power effect and the temperature effect promote coal\npermeability. Under microwave radiation, the relationship between permeability and effective stress followed a negative exponential\nfunction, and all R-squared values were greater than 0.97. The permeability increased monotonically with increasing\nmicrowave power and irradiation time, and the linear fitting slope of the rate of increase in the low-effective-stress area was greater\nthan in the high-effective-stress area. Under the same energy input, permeability increased with rising microwave power. Thepeak\ntemperature of the coal sample also increased with increasing power. When the microwave power increased to a certain range, the\npermeability growth of the coal sample was the greatest, and the temperature gradient of the coal-sample temperature field was the\nsteepest. The coal sample experienced the optimum microwave radiation power under the action of microwaves to achieve the\npermeability enhancement effect of microwaves on the coal sample. The experimental results provide a theoretical reference for\napplying microwave radiation technology in coal-bed methane extraction....
Carbon-based nanomaterials have attracted much research interest in recent years due to their excellent chemical and physiological\nproperties such as chemical stability, low cytotoxicity, and biocompatibility. The traditional methods to prepare hollow carbon\nnanospheres require complicated instrumentation and harsh chemicals, including high-temperature furnace, gas inlets, and\nhydrogen fluoride etching. Herein, we propose a new strategy to prepare hollow carbon nanospheres in a simple and fast\nmanner by using microwave radiation......................................
A high-efficiency synthesis method for a latent pigment of red pigment diketo-\npyrrolo-pyrrole (Pig. Red 272:272DPP), which is important as a functional\norganic pigment, was investigated, and the investigation results revealed that\nirradiation of microwaves (MWs) for several seconds to 272 DPP in NMP\n(N-methyl-2-pyrrolidone) solvent yielded DPP latent pigment (272DPP-BOC)\nat a high yield of 86.2%. Two kinds of latent-pigment crystals, namely, red\nand yellow, were obtained by recrystallization, and it was found that the fluorescence-\nemission properties of the two kinds differ significantly. Single-\ncrystal X-ray structural analysis showed that the difference in the fluorescence-\nemission properties of the two types is derived from the difference in\ntheir crystal structures....
The effect of microwave irradiation on the intermolecular and intramolecular\nFriedel-Crafts acylation of aromatic compounds was investigated. Microwave\nirradiation had no effect on the intermolecular reaction but had an accelerating\neffect on the intramolecular reaction. This enhanced intramolecular reactivity\nthat was attributed to the high probability of close proximity between\nthe reaction sites....
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