对甲氧基苯乙酮缩氨基硫脲Sn(Ⅱ)、Pb(Ⅱ)配合物的直接电化学合成

用电化学金属阳极氧化法在非水溶剂中合成了对甲氧基苯乙酮缩氨基硫脲 ( HL)与 Sn( )、Pb( )的配合物 ,通过元素分析、红外光谱、紫外光谱、摩尔电导等对配合物进行了表征。     

热漫镀铝工艺及水溶液助镀剂的研究

概述了热浸铝工艺的发展状况及研究进展,讨论了熔剂法热浸镀铝的助镀工艺及助镀剂的选择,确定水溶液助镀法工艺,讨论了水溶液助镀剂的作用机理,并对浸铝钢的耐蚀性耐热性及抗氧化性进行了论述。     

聚苯胺及其复合材料研究现状

对聚苯胺的结构、合成及其机理、质子酸掺杂 ,聚苯胺的应用 ,以及聚苯胺复合材料的研究现状进行了综合阐述 ,并详细介绍了有关煤基聚苯胺的研究情况。煤基聚苯胺和纯聚苯胺相比 ,电导率下降不大 ,而且成本降低、热稳定性增强 ;同时 ,煤基聚苯胺也为煤的非能源利用提供了新途径和新机遇 ,具有一定的推广价值。     

聚酰胺/溴化丁基橡胶动态硫化热塑性弹性体研究进展

介绍了聚酰胺/溴化丁基橡胶动态硫化热塑性弹性体(PA/BIIR TPV)的制备及应用研究进展。概述了国外使用溴化对甲基苯乙烯-异丁烯共聚物(BIMS)与尼龙进行动态硫化制备TPV的工艺优缺点和制备的TPV特性。描述了国内用PA/BIIR体系制备TPV的特点及不足,阐明了用改性BIIR和尼龙制备TPV的工艺优点及制备的TPV优良性能。     

硅橡胶泡沫材料技术及应用

综述了近年来硅橡胶泡沫材料的研究进展, 着重从硅橡胶泡沫材料的制备及发泡机理、功能性硅橡胶泡沫材料以及硅橡胶泡沫材料的应用等方面进行介绍。并指出硅橡胶泡沫有望成为未来发泡材料的发展方向之一。     

Alteration of the Route to Menaquinone towards Isochorismate-Derived Metabolites

Chorismate and isochorismate constitute branch-point intermediates in the biosynthesis of many aromatic metabolites in microorganisms and plants. To obtain unnatural compounds, we modified the route to menaquinone in Escherichia coli. We propose a model for the binding of isochorismate to the active site of MenD ((1R,2S, 5S,6S)-2-succinyl-5-enolpyruvyl-6-hydroxycyclohex-3-ene-1-carboxylate (SEPHCHC) synthase) that explains the outcome of the native reaction with α-ketoglutarate. We have rationally designed variants of MenD for the conversion of several isochorismate analogues. The double-variant Asn117Arg–Leu478Thr preferentially converts (5S,6S)-5,6-dihydroxycyclohexa-1,3-diene-1-carboxylate (2,3-trans-CHD), the hydrolysis product of isochorismate, with a >70-fold higher ratio than that for the wild type. The single-variant Arg107Ile uses (5S,6S)-6-amino-5-hydroxycyclohexa-1,3-diene-1-carboxylate (2,3-trans-CHA) as substrate with >6-fold conversion compared to wild-type MenD. The novel compounds have been made accessible in vivo (up to 5.3 g L⁻¹). Unexpectedly, as the identified residues such as Arg107 are highly conserved (>94 %), some of the designed variations can be found in wild-type SEPHCHC synthases from other bacteria (Arg107Lys, 0.3 %). This raises the question for the possible natural occurrence of as yet unexplored branches of the shikimate pathway.     

木糖醇悬浮液过滤与干燥特性的实验研究

由工艺实验得出了木糖醇悬浮液的过滤方程和干燥曲线 ,并对其特性进行了讨论。在此基础上 ,提出了木糖醇悬浮液过滤与干燥的工艺条件 ,这些结果可作为新工艺设计和老工艺改造的依据。     

含膦丙烯酸-AMPS二元共聚物的合成及性能研究

以丙烯酸 (AA)、2 -丙烯酰胺 - 2-甲基丙磺酸 (AMPS)和次磷酸钠 (NaH2 PO2 ·H2 O)为单体 ,水为溶剂 ,过硫酸铵为引发剂合成了含膦丙烯酸 -AMPS二元共聚物 (YSS -96 ) ,并对其阻垢和缓蚀性能进行了评定 ,结果表明 ,该共聚物不仅具有优良的阻垢分散性能 ,而且对碳钢也有很好的缓蚀作用 ,是一种性能优异的新型水质稳定剂     

Mechanical flange forming in steel and copper foil

Flange forming is a process which is wide spread in macro range for blanks with thicknesses from less than 1?mm up to several millimeters. Flange formed geometries are used as preforms for threads but also as device to give guidance and contact face to bolts and axles in sheet metal. A great advantage of flange forming compared to other machining processes is low process cycle time combined with high material utilization. Thus, a reasonable repertoire of knowledge has been gained for flange forming in macro range. Due to ongoing miniaturization of today??s products, flange forming is an interesting process applicable in micro range as well whereas size effects do not generally allow transfer of process limits from macro to micro range. Therefore the maximum flaring ratio for flange forming in micro range for sheet metal foil of 10?C25???m for a stainless steel 1.4301 and Copper E-Cu58 is investigated and compared with results in macro range. It is shown that the maximum flaring ratio decreases with decreasing sheet metal thickness. The resulting flange heights of experiments are compared with theoretical estimations which show a good accordance.     

熔体的定向受迫流动对高纯A1柱状晶生长特征的影响

研究了在离心力场和电磁场作用下融熔高纯Ａ１的凝固现象。研究结果表明，在二种力场共同作用下，产生的熔体定向受迫流动对柱状晶的生长方向和形态有很大影响，柱壮晶朝向迎流一侧发生倾斜，并随着离心转达和磁场强度的增加，柱状晶细化，倾斜角度增加。首次利用柱状晶间层流边界层理论解释了这一现象。