Synthesis and Structure of Dimeric β-Diketiminato Co（ Ⅱ ） Chloride Complex

Recently, late-transition-metal complexes have been extensively used as both inorganic and organometallic catalysts. Some complexes have been developed as the novel olefin polymerization catalysts and copolymerization catalysts for ethylene and polar comonomers due to their lower oxophilicity and presumed greater functional tolerance.     

锆对低温液相合成甲醇Cu-Cr催化剂性能的影响

Cu-Cr and Cu-Cr-Zr catalysts for the low temperature methanol synthesis slurry phase, with the surface area of 77.9 and 113.2 m2/g respectively, were prepared by the co precipitation approach. The activity and selectivity of these catalysts were evaluated in a stainless steel autoclave at 5.5 MPa and at different temperatures of 383 and 423 K separately. It was found that the activity of Cu-Cr-Zr catalyst was obviously higher than that of Cu-Cr catalyst, whereas the methanol selectivity of Cu-Cr-Zr catalyst was a little lower. The concentration of sodium compounds in the solution after reaction was also measured. The results showed that the concentration of sodium formate after reaction is much lower than that before reaction, which is quite different from the observations from the Cu-Cr catalyst previously. This implies that the conversion of sodium methoxide to sodium formate has been completely suppressed in the presence of zirconia in Cu-Cr-Zr catalyst. This finding is more beneficial to improve the performance of Cu-Cr catalyst and to increase the life of catalyst system as well.     

Effect of Excipients on Stability and Structure of rhCuZn-SOD Encapsulated in PLGA Microspheres

When a protein is encapsulated into poly (DL-lactide-co-glycolide)(PLGA) microspheres by means of thedouble-emulsion method, the harsh microspheres formation process including ultrasonifieation, exposure toan organic solvent and a polymer may cause the denaturation of the protein. In this study, we investigatedthe enzymatic activity change and the effect of the excipients on the stability of recombinant human Cu ,Zn-su-peroxide dismutase (rhCu, Zn-SOD) during the emulsification. The specific activity recovery was found to beconcentration dependent and the excipients involved such as PEG 600 and Tween 20. and trehalose wereshown to increase the stability of rhCu, Zn-SOD. The protein structural integrity within the microsphereswas analyzed by FTIR. The structure of rhCu, Zn-SOD within PLGA microspheres containing trehalose wasfound to be similar to that of the native solid state, whereas the protein encapsulated during the preparationin the absence of any excipient changed due to the possible hydrophobic interaction with the polymer. The re-sults suggest that a rational stability strategy for protein to be encapsulated into microspheres should aim atdifferent processes.     

微波促进下4-芳基亚氨基-1,2,4-三唑的合成

无溶剂;无催化剂;微波辐射;取代基-巯基-芳基亚氨基三唑     

过氧化氢在液固相绿色氧化反应中的应用

介绍了由各种金属Ti, Mn, Cu, Al, Os, Ru, W, V, Fe, Mo, Re制备的固相催化剂体系,以过氧化氢为氧化剂,实现了温和条件下绿色氧化反应.     

空间外差干涉光谱仪信噪比研究EI北大核心CSCD

以传统非成像式的高光谱空间外差干涉光谱仪为例,详细推导了传统空间外差干涉光谱仪的空域和光谱域信噪比(SNR)的表达式,分析了仪器各影响因素与SNR的关系,包含空间分辨率、光谱分辨率、干涉条纹调制度和电子学噪声等,并结合样机成像方式进行了讨论,得出了相应的结论。结果表明,计算SNR可有效评估和反映光谱仪的特性。     

高斯－谢尔模型光束的变换特性

在一般情况下推导出高斯－谢尔模型光束经ＡＢＣＤ光学系统变换后的相干模迭加表示式。     

二氧化钒薄膜的光学特性及应用前景

本文着重介绍二氧化钒（ＶＯ２）薄膜的性质，相变原理，若干制备工艺对ＶＯ２薄膜相变特性的影响并给出ＶＯ２薄膜的应用方向。     

X波段六腔渡越管振荡器的高频特性研究

从麦克斯韦方程出发,采用时域有限差分法（FDTD）和离散傅里叶变换（DFFT）相结合的方法,通过数值计算得出了六腔开放式谐振腔中前四个谐振频率和场分布,计算出的谐振频率与实验测量结果基本相同。比较了开放腔和封闭腔谐振频率,验证了TEM波吸收边界条件,并在实际编程计算中得以应用。计算结果为六腔渡越管振荡器的机理研究提供了依据。