钒化合物对酸性镀锡溶液的稳定作用

研究了钒化合物稳定剂对酸性SnSO4 溶液稳定性的影响 .可见光谱分析表明稳定剂中主要含有VO2 + 和少量的V3+ ,循环伏安实验显示在 - 0 .2 0～ - 0 .55V(vs .SCE)电位范围内VO2 + 能够在阴极上还原为V3+ ,在更负的电位下V3+ 能进一步还原到V2 + .实验结果说明稳定剂中的低价钒离子有效地清除了镀液中的溶解氧 ,因而防止了Sn2 + 离子的氧化 ,显著地提高了酸性锡镀液的稳定性 .     

磺酰胺萃取回收水中的铅

研究了2-（十二烷基苯磺酰胺）噻唑和2-（十二烷基苯磺酰胺）苯并噻唑萃取铅（Ⅱ）的行为。研究表明,这两种萃取剂在一定的条件下,能有效萃取铅（Ⅱ）,并采用斜率法探讨了它们对铅（Ⅱ）的萃取机理。     

汽车空调器压缩机用冷冻机油的研究

采用三氟化硼乙醚 (BF3·Et2 O)催化体系合成较高粘度的环氧丙烷均聚醚 ,观察了不同反应参数对聚醚粘度的影响。同时考察了不同催化剂对聚醚酯性能的影响。结果表明 ,用固体钨硅酸合成的聚醚酯较对甲苯磺酸的性能好     

Photoinduced Electron Transfer Reaction between Poly-guanylic Acid (5`) with Anthraquinone-2-sulfonate

TheinteractionofquinonephotonucleasewithDNAhasbeenwidelystUdied.Anthraquinonederivatives,inparticularthatofanhraquinone-2-sulfonatehasbeenusedascleavingagentforduPlexDNA1-5.Howevef,directobservationofexcitedionpairsofbiomoleculesespeciallytheStabilizedradicalcationofbiomoleculeishamPeredbytheoverwhelmingtransientabsorPtionofhydrogenbondedradicalanionofquinone.lnthiswork,theinteractionofpolylG]withtripletanthraquinone-2-sulfonateinCH,CN-H:O(97f3)viaelectrontransferreactionhasbeenachieved…     

元件疲劳可靠性估算方法

对近年来国内外在元件疲劳可靠性估算方法方面所做的研究作了系统的回顾和讨论,按安全余量方程将其分为三类：累积损伤模型、乘余强度模型和疲劳寿命模型,并对这三种模型的特点及局限性作了分析论述,对元件疲劳可靠性分析的发展趋势作了讨论。     

金刚石颗粒表面Cr金属化及薄膜间界面扩散反应的研究

运用直流磁控溅射法可在金刚石颗粒表面沉积150nm的金属Cr层.在超高真空条件下,经300-600℃的热退火处理,可促进Cr膜与金刚石基底间的界面扩散和反应.利用俄歇电子能谱研究了Cr/金刚石颗粒界面的结合状态,发现Cr与金刚石薄膜发生了强烈的界面扩散,Cr元素渗入金刚石层达90nm,并在界面上发生化学反应形成Cr的碳化物层.对界面扩散反应动力学的研究表明,Cr/金刚石界面扩散反应的表观活化能为38.4kJ/mol,界面扩散反应主要由碳的扩散过程控制.热处理温度越高,界面扩散及反应越显著,但不利于碳化物层生成的氧化反应速度也会有所增加,界面反应产物从Cr₂C₃转变为Cr₂C物种.延长热处理时间有利于金属碳化物的生成,同样导致界面反应产物从Cr₂C₃转变为Cr₂C物种.     

Oligomerization of Molybdenum Clusters via Multi-Functional Ligands

Trinuclear molybdenum clusters show diversity of reactivity towards transition metals and organic ligands. For example, different ligand-substitution and additive reactions can take place at the five coordination sites of Mo₃S₄(DTP)₃(μ-L)(L')(Ⅰ). The bridging ligand μ-L, the terminal DTP'S and the loosely-coordinated ligand L'can be replaced by many carboxylic acids and polar solvents, respectively. By this way, many hetero-metallic cluster derivatives can be synthesized.     

Synthesis and Crystal Structure of Molybdenum-Sulfur Cluster Compounds Coordinated by Nicotinic Acid and Isonicotinic Acid

Cuboidal Molybdenum have been paid much attention due to their structural resemble with those metallic centers in some biological systems^[1]. To explore the chemistry of trinuclear Mo-S cluster complexes^[2], we rationally synthesized two compounds:Mo₃S₄(DTP)₃(nicotinate)(Py)·EtOH (Ⅰ) (DTP=diethyl dithiophosphate) and Mo₃S₄(DTP)₃(isonicotinate)(Py)·EtOH (Ⅱ) by the substitution reaction of Mo₃S₄(DTP)₃(L)(Py) (L=ClCH₂COO-, CH₃COO-) with nicotinic acid and isonicotinic acid, respectively.     

The Cross Link of Surface Enhanced Raman Scattering with Surface Science and Nanoscale Science

The discovery of surface enhanced Raman scattering (SERS) in the mid-1970s impacted on the surface science community because of its remarkably high and unique surface sensitivity. Surface roughness in scale of 10~100 nm have been found necessary to produce the giant SERS signal. In this paper we will show that SERS is indeed one of the important phenomena not only in surface science but also in nanoscale science^[1].     

带多重选择的最短路问题:复杂性和算法

本文提出了带出重选择的是短路问题,建立了该问题的数学模型,利用背包问题的一个变形问题－带限制选择的背包问题,证明了该问题是ＮＰ－Ｃ的,最后利用动态规则给出了一个伪多项式算法,其时间复杂性Ｏ（Ｃｈｍｎ）,其中ｈ是最大的选择重数。