PVP-Pd催化剂六氯苯加氢脱氯中两种氢源的贡献

近年来,随着环境问题的日益突出,含卤有机化合物作为一类主要的环境污染物,其加氢脱卤反应的研究越来越多地受到人们的关注.     

Synthesis of hexagonal monocrystal AlN microtubes and nanowires at low temperature

This paper reports that pure hexagonal aluminium nitride microtubes and nanowires growing along the [0001] direction have been successfully synthesized by directly reacting AlClh-AlN, microtubes, nanowires,h-AlN, microtubes, nanowiresProject supported by the National Natural Science Foundation of China (Grant No 10474078) and the Science Foundation of the Education Office of Shanxi Province, China.2006-11-23This paper reports that pure hexagonal aluminium nitride microtubes and nanowires growing along the [0001] direction have been successfully synthesized by directly reacting AlCl3 with NaN3 at low temperature （450℃） under condition of non-solvent system. The grey-white powder of reacting product was characterized by high-resolution transmission electron microscope （HRTEM）, which shows that the powder is long straight-wire morphology with outer diameter from 40nm to 300 nm and length up to several micrometres. The results of both electron diffraction （ED） and x-ray diffraction （XRD） indicate that the AlN microtubes have a pure hexagonal monocrystal tubular structure with the combination of the curled AlN nanobelts. Room-temperature photoluminescence spectrum of the synthesized sample showed an emission peak, which is closely related to the small size of the microtubes.     

基因兴奋剂检测的现状与策略

本文综述了基因兴奋剂检测的现状和反基因兴奋剂的策略。归纳了可能被运动员滥用的基因兴奋剂,分析了由这些基因表达的促红细胞生成素(EPO)、人生长激素(hGH)等蛋白的检测进展,讨论了未来检测基因兴奋剂的可能策略。     

一种有限元并行计算前处理方法

本文研究一种有限元并行计算前处理方法,只需将各子结构的超单元信息发送给各处理机,就可并行自动剖分各子结构和并行优化各子结构单元编号,以达到极小最大波宽和波宽的均主根,算例表明,该方法可大大减少有限元并行计算前处理时间。     

基于Pythagorean犹豫模糊熵和交叉熵的绩效评价方法

针对模糊环境下的绩效评价问题,提出了一种基于Pythagorean犹豫模糊熵和交叉熵的人力资源绩效评价方法.基于Pythagorean犹豫模糊熵和交叉熵,文章提出了一种新的专家权重和属性权重确定方法;并给出了一种基于TOPSIS法和矢量投影法的组合决策模型;最后将该决策方法运用到金融企业人力资源绩效评价问题中,验证其可...     

Co@C催化木质素衍生酚类化合物的加氢转化

采用溶剂热法合成Co-MOF,然后通过一步热解法制备了Co@C催化剂.通过N2物理吸附-脱附(BET)、X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等分析手段对Co@C催化剂的结构进行了表征.探讨了Co-MOF热解温度、反应温度、初始氢压以及反应时间对Co@C催化...     

ACOUSTIC ABSORPTION CHARACTERISTICS OF FOAMED ALUMINUM

The acoustic absorption characteristics of foamed aluminum and the effect of its structural parameters on the characteristics have been in vestigated. The results indicate that the acoustic absorption behavior of foamed aluminum has an uncertain relation with its porosity, the effect of pore size is non-monotonous, while the flow resistance, which characterizes the structural coefficients, might be the most important factor. It is also found that the absorption peak is widened and the noise reduction coefficient can be increased through suitable compressive deformation.     

能量耗散技术探索液态物质结构的新进展

本文介绍了近期用能量耗散方法探索液态物质结构及其动力学行为的新进展。其中液态物质包括了金属及其合金的熔融态，以及高分子聚合物的溶液和熔融态。该方向的研究工作虽才开始，但已显示出能量耗散技术的广阔应用前景。     

MBE GaAs_(1-x)Sb_x/GaAs应变层量子阱的光调制反射光谱

本文采用光调制反射光谱技术研究了MBEGaAs_(1-x)Sb_x/GaAs应变层量子阱。通过实验分析和理论上对受应力作用后能带结构的估算,确认在这一系统中流体静压力作用引起的能带结构变化主要出现在导带上,同时也证实了GaAs_(1-x)Sb_x/GaAs应变层量子阱属于第Ⅱ型量子阱结构。实验结果与理论估算符合很好。     

新型虚阴极振荡器的研究

 采用小信号理论，在考虑到透射、反射束电子不同作用下，分析了虚阴极振荡器产生微波的机制，获得了计算微波主频的方法，讨论了增强束波作用效率的方法，并提出一种新型结构的虚阴极振荡器。该振荡器的阳极后放置了一个谐振腔，谐振腔长度很小，虚阴极不能在其中形成，谐振腔受到反射电子束激励并建立强场，场对入射电子进行调制，同时采用同轴结构引出微波。利用2.5D PIC 程序对新型的结构进行了数值模拟，验证了理论分析的正确性。在入射电子束电子能量为520keV和电子束流12.5kA的条件下，获得微波平均功率为1GW，频率为3.66GHz，平均束波转换效率为15.3%。