Highly Active Multidentate Ligand‐Based Alkyne Metathesis Catalysts

Alkyne metathesis catalysts composed of molybdenum(VI) propylidyne and multidentate tris(2‐hydroxylbenzyl)methane ligands have been developed, which exhibit excellent stability (remains active in solution for months at room temperature), high activity, and broad functional‐group tolerance. The homodimerization and cyclooligomerization of monopropynyl or dipropynyl substrates, including challenging heterocycle substrates (e.g., pyridine), proceed efficiently at 40–55 °C in a closed system. The ligand structure and catalytic activity relationship has been investigated, which shows that the ortho groups of the multidentate phenol ligands are critical to the stability and activity of such a catalyst system.     

迭代目标转换因子分析光度法同时测定钯,铑

钯，铑二元素于ＨＡｃ－ＮａＡｃ缓冲介质中，在表面活性剂Ｔｒｉｔｏｎ Ｘ－１００存在下与５－Ｂｒ－ＰＡＤＡＰ形成灵敏度较高的紫红色络合物，其摩尔吸光系数分别为ε５６５＾ｐｄ＝１．４４×１０＾５，ε５６２＾Ｒｈ＝１．１７×１０＾５（Ｌ·ｍｏｌ＾－１·ｃｍ＾－１）。二元素络合物吸收光谱发生严重重叠。本文探讨了在上述体系中同时测定Ｐｄ，Ｒｈ的最佳条件，并采用迭代目标转换因子分析法（ＩＴＴＦＡ）对Ｐｄ，Ｒｈ     

1μm高速CMOS容错时钟接收器电路的研制

采用新的设计规则与先进的自对准硅化钛LDD CMOS工艺,研制成功了相当于1386主频的1μm、25MHz高速容错时钟接收器电路.     

Investigation on the third order nonlinearity of some organic charge-transfer complexes

The degenerate four wave mixing experiments have been performed in the N, N-dimethylformamide solutions of 3, 4, 9, 10-Tetramethylperylene (TMP) · AsF_6 and (TMP) · PF_6, respectively. The result showed that the two complexes have large nonlinear optical response.     

实用型CAPP的工艺编码系统

根据ＣＡＰＰ系统中对工艺表示及工艺存储的科学合理性要求，结合我国机械制造企业的生产现状，提出一种实用的工艺编码系统，并应用于宁波动力机厂中小型回转体类零件的ＣＡＰＰ系统中。     

迭代目标转换因子分析光度法同时测定化探样品中钼、钨

本文以水杨基荧光酮为显色剂、采用迭代目标转换因子分析光度法,不经分离对化探样品中钼、钨进行同时测定。结果表明,各组分的相对误差一般小于10％,Mo、W的相对标准偏差分别为1.6％,1.5％。取得满意结果。对标准数据阵的构成、因子数的确定以及矿样分解,干扰消除等诸问题进行了探讨。     

质子交换膜燃料电池及电池组模型分析

本文对现有质子交换膜燃料电池以及电池组模型进行比较分析,认为数学模型的建立,可以增加对燃料电池及电池组内部的传递现象和反应机理的认识,同时可以预测电池以及电池组的性能,并且对优化电池结构参数具有指导意义.模型分析包括了现阶段质子交换膜燃料电池单电池模型和电池组模型的基本类别,它们是单电池CFD数值模拟模型、单电池以及电池组性能模拟模型、燃料电池组气体分配模型、系统模型和非稳态模型.比较了几种模型的建模方式及不同模型的应用范围和各自的优缺点.     

烯丙基锂四氢呋喃配合物的合成

在四氢呋喃存在下,将丙烯和丁基锂直接反应合成了未见文献报道的烯丙基锂四氢呋喃配合物。对产物组成进行了鉴定,并用红外光谱讨论了烯丙基的结构。对反应条件进行了较为详细的研究。     

Selective functionalization of In2O3 nanowire mat devices for biosensing applications

A strategy to covalently attach biological molecules to the electrochemically active surface of indium oxide nanowire (In2O3 NW) mat devices is presented. A self-assembled monolayer (SAM) of 4-(1,4-dihydroxybenzene)butyl phosphonic acid (HQ-PA) was generated on an indium tin oxide (ITO)-coated glass and In2O3 NWs surface. The chemical steps required for surface derivatization were optimized on an ITO surface prior to modifying the In2O3 NWs. The hydroquinone group contained in the HQ-PA SAM was electrochemically oxidized to quinone (Q-PA) at +330 mV. The monolayer of Q-PA was allowed to react with a thiol-terminated DNA. The DNA was paired to its complementary strand tagged with a fluorescence dye. Attachment of DNA was verified using fluorescence microscopy. A device was subsequently prepared on a SiO2-supported mat of In2O3 NWs by depositing gold electrodes on the mat surface. The reaction strategy optimized on ITO was applied to this In2O3 NW-based device. Arrays of In2O3 NWs on a single substrate were electrochemically activated in a selective manner to Q-PA. Activated In2O3 NWs underwent reaction with HS-DNA and gave a positive fluorescence response after pairing with the dye-DNA. The unactivated In2O3 NWs gave no response, thus demonstrating selective functionalization of an In2O3 NW array. This can be considered a key step for the future fabrication of large-scale, inexpensive, nanoscale biosensors.