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李罡 《通信业与经济市场》2004,(8):26-27
8月16日下午,家具商吴明明涉嫌冒充教育部长秘书,以帮助外地考生上名牌大学为由诈骗18万元一案,在海淀法院开庭审理。庭审质证阶段,该案公诉人出示的受害考生刘豪家长用手机拍下的送钱照片证据颇为引人注目。虽然送交被告人质 相似文献
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应用石墨为微波吸收介质非极性溶剂微波提取孜然挥发油成分 总被引:2,自引:0,他引:2
1引言微波加热效率高低主要取决于体系中物质吸收微波的能力大小,由于非极性溶剂不吸收微波因而通常不能单独作为微波辅助提取的提取溶剂。乙醚是一种常用的非极性溶剂,在蒸馏-提取法(simultaneous distillation and solvent extraction,SDE)中被用作提取溶剂,石墨是一种良好的微波吸收介质,本实验通过在乙醚中加入石墨建立了孜然中挥发油组分的非极性溶剂微波提取法(non-polar solvent microwave extraction,NPSME), 相似文献
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Propagation properties of off-axis Hermite--cosh--Gaussian beam combinations through a first-order optical system 下载免费PDF全文
Based on the Collins integral formula, the analytic expressions of propagation of
the coherent and the incoherent off-axis Hermite--cosh--Gaussian (HChG) beam
combinations with rectangular symmetry passing through a paraxial first-order
optical system are derived, and corresponding numerical examples are given and
analysed. The resulting beam quality is discussed in terms of power in the bucket
(PIB). The study suggests that the resulting beam cannot keep the initial intensity
shape during the propagation and the beam quality for coherent mode is not always
better than that for incoherent mode. Reviewing the numerical simulations of
Gaussian, Hermite--Gaussian (HG) and cosh--Gaussian (ChG) beam combinations
indicates that the Hermite polynomial exerts a chief influence on the irradiance
profile of composite beam and far field power concentration. 相似文献
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采用改进的圆盘凝胶电泳提取人血清中低分子量蛋白质, 去除了血清中分子量大于3×104的蛋白质, 将提取的低分子量蛋白质热变性后直接在溶液中酶解成肽, 经液相色谱-质谱分析, 并进行Mascot数据库检索, 确认出人血清中97种蛋白质. 相似文献