Indium(I) bromide-mediated coupling of dibromoacetonitrile with aldehydes followed by Boord elimination of bromine and oxygen of β-bromo alkoxides for preparation of 3-organyl-2-alkenenitriles

The organoindium compound derived from indium monobromide and dibromoacetonitrile reacts with carbonyl compounds to afford the corresponding 2-bromo-2-cyano-indium(III) alkoxide. The action of a second equivalent of indium monobromide onto the alkoxides derived from aldehydes promotes the Boord elimination of the β-related oxygen and bromine atoms leading to 2-alkenenitriles.     

以XPS研究谢一矿矸石粉表面与非离子表面活性剂间的相互作用

本文用XPS分析比较了非离子型表面活性剂司班—80和吐温—85对谢一矿矸石粉的表面改性处理效果,发现在所讨论的情况下,表现处理过程主要是一个物理过程.然而,在矸石粉的Ca与处理剂分子中的O之间,存在着较明显的化学作用.     

Chemischer Transport und Sublimationsverhalten von CrBr3 — Experimente und Modellrechnungen

On the Chemical Transport and Sublimation of CrBr₃ — Experiments and Model Calculations The migration of CrBr₃ in the presence of high concentrations of bromine (for example D(Br₂) = 0,05 mmol/ml; closed silica ampoules) in the investigated temperature range (T? = 625°C to 875°C; T? = 50°C) is a result from the endothermic reaction The chemical transport of CrBr₃ is superimposed with the sublimation. With low concentrations of D(Br₂) and high temperatures T? is the sublimation decisive participated. This is a result of the homogenous equilibrium between CrBr_3,g and CrBr_4,g (2a) The reaction (2a) in comparison with the chemical transport of CrCl₃ with Cl₂ (Gl. (2b)) is more shifted to CrBr_3,g.     

Study of chemical bonds in a-B/C:H films by electron probe microanalysis

This paper describes the study of chemical bonds in amorphous hydrogen rich boron/carbon (a-B/C:H) films by electron probe microanalysis. The films were deposited on Si single crystals by plasma chemical vapour deposition with a precursor-carborane (C₂B₁₀H₁₂) in a laboratory setup. A film thickness and B/C ratio up to a value of 8000 Å and 4, respectively, have been obtained. The analysis of boron and carbon X-ray emission spectra has shown that the nearest order in the films is characterized by the coexistence of C-C, B-C and B-B bonds for B/C 1 and of B-B and B-C bonds for B/C 4. After two years exposure in air the oxygen content in the films increases from 2–5 to 15–20 at.%.     

应用滋养和包埋技术进行籼稻原生质体培养和植株再生

从几个籼稻品种不同发育阶段的幼穗分离出密度平均为２２×１０５个／ｍＬ～４６×１０５个／ｍＬ的原生质体。将这些原生质体包埋在藻酸钠颗粒里并分别在粳稻愈伤组织滋养下培养和没有愈伤组织滋养。在这两种培养条件下原生质体稳定,分裂频率分别达到４８４％和３８８％,群体存活率达到５３％和４７％,愈伤组织绿苗分化率达到７１６％和６２３％。这两种方法优于常用的琼脂糖包埋法和琼脂糖颗粒法。     

电沉积SiC颗粒增强抗磨复合材料

采用电刷镀技术制取Ｎｉ－Ｗ－Ｃｏ／ＳｉＣ颗粒增强抗磨复合材料,分析了ＳｉＣ颗粒沉积量的影响因素,并研究了复合材料的磨损特性,实验结果表明,复合材料具有较高的硬度和耐磨性。     

用强碱性阴离子交换树脂从碳酸盐溶液中回收铀的研究 2.U(Ⅵ)在溶液相与树脂相的化学状态

在过量碳酸盐存在的Ｕ（Ⅵ）溶液中,Ｕ（Ⅵ）的化学状态与溶液的ｐＨ值有关,当ｐＨ＞８时,Ｕ（Ⅵ）以［ＵＯ２（ＣＯ３）３］４－离子存在．吸附于树脂相的Ｕ（Ⅵ）的化学状态也与供吸附的料液的ｐＨ值有关,当ｐＨ＞９时,Ｕ（Ⅵ）才完全以［ＵＯ２（ＣＯ３）３］４－吸附于树脂相．当ｐＨ在６．５～８．０范围时,Ｕ（Ⅵ）在溶液中还可能以［ＵＯ２（ＣＯ３）２］２－或Ｈｎ［ＵＯ２（ＣＯ３）３］ｎ－４形式存在,而Ｕ（Ⅵ）以［ＵＯ２（ＣＯ３）２］２－形式吸附于树脂相的可能性很小,它主要以Ｕ２Ｏ２－７的形式吸附于树脂相．     

化学镀Ni-P合金层组织结构与性能的研究

对非晶态Ｎｉ－Ｐ合金镀层的组织结构和性能进行研究,结果表明：非晶态Ｎｉ－Ｐ合金镀层以层片状沉积,表面具有胞状结构．镀层的磷含量及热处理温度对Ｎｉ－Ｐ合金层的组织结构有影响,同时对非晶态Ｎｉ－Ｐ合金镀层在不同介质中的耐蚀性进行了研究．     

Effect of aryl ligands on the chemical hardness of arylmercury cations

¹⁹F NMR spectroscopy was used to study the exchange reactions involving 4-fluorothiophenoxides, 4-nitrophenoxides, chlorides, and acetates of arylmercury and triphenylphosphinegold. The analysis of the data on equilibrium constants allows one to obtain information on the comparative chemical hardness of ArHg⁺ and Ph₃PAu⁺ cations. The increase in the electron-donating ability of aryl ligands enhances the chemical hardness of ArHg⁺ cations, their influence being best described by ⁰ constants of substituted phenyl groups.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 1255–1260, May, 1996.     

针刺对胸内肿瘤化学疗法中自由基等指标的影响

恶性肿瘤的化学疗法会产生自由基升高和白细胞数目降低等副作用,临床表现恶心、呕吐、厌食、疲乏等症状。 本文应用针刺“足三里”、“阴陵泉”、“内关”等穴位配合化学疗法,结果血中脂质过氧化物(LPO)降低,白细胞增多、消化道症状和疲乏感降低,这说明针刺疗法可作为化学疗法的重要支持手段。 针刺降低自由基的原理估计是激发了体内降解酶的作用。