Ge在MnBiAlGe合金薄膜磁光特性中的作用

研究了ＭｎＢｉＡｌＧｅ合金薄膜的磁光特性,并着重探讨Ｇｅ在合金薄膜中组分变化对磁光特性的影响,得出了当Ｇｅ为０．３时,其克尔角可达１．７５°,是很有希望的新型磁光材料．     

胜坨油田二区沙河街组二段三角洲储层微观特征

胜坨油田二区沙河街组二段（Ｅｓ２）三角洲储层以下中细砂岩,粉砂岩为主,储层的埋藏深浅,成岩作用较弱,常见压实,胶结和溶解作用,粘土矿物的转化作用也较普遍,属于早成岩期的Ｂ亚期。储层的粒间孔隙发育,以中孔中细喉结构为主,孔喉参数变化范围较大,储层成岩和孔隙结构的非均质性较强,注水开发加大了不同相带的砂体成岩和孔隙结构的差异,进一步增强了储层的非均质性。     

CYTOPLASMIC EFFECT ON GENE FUNCTION IN Xenopus laevis

The pigmentation gene of Xenopus laevis is dominant and that of albino a~p mutant recessive. Hete-rologous haploid hybrids are produced by UV inactivation of the egg nuclei during second polar body for-mation in the mutant sperm-fertilized Xenopus eggs. During development of these hybrids, melanin ap-peared in the eye and melanophores in the skin at stages comparable to those of the wild type, but muchearlier than in the albino mutant. The number and intensity of pigment cells are interinediate betweenthe black Xenopus and albino mutant. While a number of pigment cells remain in the hybrids, thosein the albino eventually degenerate. Therefore, the development and maintenance of pigmentation in hete-rologous hybrids are contributed by Xenopus cytoplasm. Tadpole tail-tips were squashed and stained for chromosome counting. The results show thatXenopus and mutants are diploid (36 chromosomes) and heterologous haploid hybrids have 18 chromosomes.     

α-松油烯-马来酸酐加成物的气相色谱分析

气相色谱法直接测定α－松油佛－马来酸酐加成物，不但免去了容量滴定法测定时必先分离共存马来酸酐的繁琐手续，而且方法简便、快速，能满足合成过程中跟踪分析的需要。     

两种结构钼磷酸的催化氧化行为

考察了Dawson与Keggin结构钼磷酸的催化氧化行为,并与结构特性进行了关联,结果发现,Dawson结构的杂多酸对氧化脱氢及插入氧反应均有更高的活性。     

稀土氧化物EuO_x对Pt/CeO_2材料在甲苯催化燃烧中的显著促进机制（英文）

挥发性有机污染物是大气环境中一类重要的污染物质,其污染控制问题已成为21世纪大气污染控制的优先方向之一.甲苯作为一种典型芳香烃在医药、农药、染料合成等多个化工行业中常用作有机化工原料并被排入大气环境,对人类的生产和生活造成极大危害.由于其高致癌性,甲苯在2017年被世界卫生组织国际癌症研究机构列为3类致癌物.在甲苯的催化燃烧降解中,负载型铂基催化剂由于其高效的低温催化活性被学者广泛研究.CeO_2作为一种典型的稀土金属氧化物具有较强的储放氧能力和高温稳定性,被视为负载型贵金属催化剂的优良载体.近期研究表明, EuO_x具有良好的催化氧化活性,并能促进金属氧化物表面氧缺位的形成.为了进一步研究EuO_x与CeO_2之间的协同效应对贵金属基催化剂低温催化性能的影响,我们利用表面模板剂法合成了具有不同Eu负载量的Pt/Eu_2O_3-CeO_2材料并应用于甲苯的深度催化氧化.研究表明, EuO_x的加入显著提高了Pt/CeO_2材料的催化性能,当Eu含量为2.5at%时(Pt/EC-2.5)该材料拥有最佳的低温氧化活性,可在200°C实现对0.09%甲苯的完全降解,在160°C时反应速率和转化频次分别高达0.9 mmolg~(–1)s~(–1)和5.52×10~2s~(–1).相比于Pt/CeO_2催化剂, EuO_x与CeO_2之间的协同作用极大提高了催化剂的氧化还原性能,增大了材料表面晶格氧和Ce3+的含量,并显著提高了贵金属活性相的分散度.通过原位漫反射红外光谱在线分析了甲苯在Pt/Eu_2O_3-CeO_2材料表面的深度降解机理.与甲苯在Pt/CeO_2材料表面的氧化行为相比,甲苯在Pt/EC-2.5催化剂表面的降解遵循典型的Mars-vanKrevelen(MvK)机理.当吸附于稀土金属氧化物载体后,在Pt活性位点、晶格氧及表面酸性位点的联合作用下,甲苯以酮类和醛类为主要的中间产物,被迅速深度氧化为H_2O和CO_2.     

亲电性对醌二甲烷与富电子烯烃的电荷转移聚合

概述了亲电性对醌二甲烷与富电子烯烃电荷转移聚合的最新进展，着重介绍聚合的一般特征、引发机理、链增长机理，以及单体结构、溶剂对聚合反应的影响。     

Crystal Structure of Chlorinate （N,N-1,3-Dibenzyl-benzimidazole） Hydrate

1 INTRODUCTION Benzimidazole is an interesting heterocyclic ring because it is present in various naturally occurring drugs, such as omeprazole, astemizole and emedastine difumarate[1]. The efficacy of substituted benzimidazoles in the treatment of parasitic infections is well known[2～4], and the pharmacophores in parasitic chemotherapy are established by benzimidazole-substituted moieties. Bis(2-benzimidazoles) and some substituted bis- (benzimi-dazol-2-yl) alkanes have attracted much…     

络合物的分步稳定常数与配位数间的关系(有机配位体)

作者曾建议理论关系式 (中性分子配位体) (2)对无机配位体络合物的分步稳定常数(k_n)与配位数(n)间的变化规律作过讨论。并指出了络合物的log k_n与n呈线性和非线性变化的条件和原因。本文尝试在前文的基础上,对有机配位体络合物的分步稳定常数与配位数间的变化规律作一探讨。对有机配位体的络合物,本文作以下分类:即单     

Synthesis, Structure and Biological Activities of Novel Triazole Compounds Containing N,N-Dialkyldithiocarbamate Moiety

Introduction As an important type of fungicides, triazole compounds are highly efficient, low poisonous and inward absorbent.1-3 At present, the studies on triazole derivatives are mainly concentrated on compounds with triazole as the only active group. The report of triazole compounds that contain both triazole group and other active group in a single molecule has rarely been found. Dialkyl-substituted dithiocarbamate salts have also shown interesting biological effects.4 N,N-Dialkyldithio-…