N值随机序列的随机选择的强极限定理

将赌博系统的随机选择理论扩展到N值随机序列,利用似然比概念及分析技术,得到一个随机选择下有序数偶相对频率的强极限定理     

关于BCK-代数中对偶理想的一个定理

证明文[3]中的若干定理的交换性要求可以去掉.主要结论是:若X是有界BCK代数,D是X的对偶理想,一定存在从DI(X,D)到DI(XD)的一一对应     

手性分子中的宇称破缺:D-和L-丙氨酸的变温中子结构研究

利用单晶的中子衍射研究295 K和60 K时丙氨酸对映体的结构特征以及由D到L构型转变的可能性.中子衍射数据揭示了变温过程中产生的晶格扭曲和的扭转. 通过分析宇称破缺能差EPV随二面角及扭角的变化,肯定了D-丙氨酸能量高于L-丙氨酸的结论.降温过程中D-和L-丙氨酸的弱氢键的行为的差异表明,可能是由于电弱相互作用宇称不守恒所引起.丙氨酸中子结构再次证实Cα－H…O氢键的存在.然而,比较295 K和60 K(高于和低于丙氨酸相变温度250 K)的中子衍射结构数据,表明并没有发生D型到L型的构型转化,这意味着Salam相变不是传统意义的结构相变.     

二（1N-苄基-苯并咪唑）二氯合钴配合物的晶体结构、电化学和热稳定性能研究(英)

0IntroductionBenzimidazoleisaninterestingheterocyclicringbecauseitispresentinvariousnaturallyoccurringdrugs,suchasomeprazole,astemizoleandemedastinedifumarate[1].Theefficacyofsubstitutedbenzimida鄄zolesinthetreatmentofparasiticinfectionsiswellknown[2,3].B…     

单分子导电性质的研究进展

介绍了测量单个有机分子导电性质的一些进展,包括分子的尺寸效应、官能团效应、分子与电极的接触效应等,以及分子逻辑器件的初步研究.     

离子液体中二羰基化合物的烷基化反应

为取代传统的有机溶剂，离子液体将为现代化学溶剂提供一种新颖而环境友好的选择，以1－丁基吡啶四氟硼酸盐为离子液体，实现了1，3－二羰基化合物的烷基化反应，提供了一种既方便又实用的操作方法。     

水合羟基高氯酸镍(Ⅱ)的晶体结构(英)

Green single crystal of the title compound was accidentally obtained by the reaction of N,N′-bis(pyridylcarbonyl)-4,4′-diaminodiphenyl ether (L) with nickel perchlorate. In the structure of [Ni( μ₃-OH)( μ₃-ClO₄)(H₂O)]_n, the local coordinating geometry around Ni center displays a distorted octahedron in which one coordination site of each metal atom was occupied by a water molecule. Each perchlorate anion and hydroxyl group acts as a tridentate bridging spacer to bind three Ni atoms, thus resulting in the formation of two-dimensional layered network. CSD: 414263.     

双甲基酮的制备

从壬二酸、癸二酸和十一碳烯酸出发，经脱羰端烯化反应、Wacker反应制备了2，6－康二酮，2，7－辛二酮，2，9－苯二酮。所得化合物的结构经IR,^1H NMR,^13C NMR和MS证实。     

胶束微观非均相体系与化学发光能量转移

胶束微观非均相体系能提高化学发光的选择性和灵敏度,并且实验操作方便,因此其在化学发光检测技术中的应用已成为研究热点.胶束增敏化学发光是对激发量子效率,荧光量子效率以及反应的速率综合作用的结果.本文综述了正相和反相胶束体系在能量转移型化学发光体系中的应用,同时阐述了胶束与不同发光体系的相互作用.     

应用立式逆流色谱和反相液相色谱制备性分离荜菝中的酰胺类化合物

A versatile countercurrent chromatography with upright type-J multilayer coil planet centrifuge,named upright countercurrent chromatography (UCCC),was applied to the isolation and purification of amides from Piper Longum L., which is widely used as an anodyne and a treatment for stomach disease in China. After saponification by KOH of the ethanol extracts solution of crud drug "Piper Longi Fructus", the fruits of Piper Longum L., the remaining solution was extracted with petroleum ether and red crude oil was obtained. Using 2.5 g red crude oil as sample, the preparative UCCC with a two-phase system composed of petroleum ether (b. p. 60 ～ 90 ℃)-ethyl acetate-tetrachloromethanemethanol-water ( 1: 1: 8: 6: 1, v/v) was successfully performed, yielding ten fractions. Then these fractions were further purified by use of reversed-phase liquid chromatography with a glass column of 500 × 10 mm I. D.packed with reversed - phase silica gel. As a result,nine amides with more than 98% purity, i.e., (2E,4E)-N-isobutyl-eicosa-2,4-dienamide, (2E, 4E, 8Z)-N-isobutyl-eicosa-2,4,8-trienamide, (2E, 4E, 8Z)-N-isobutyl-ocatadeca-2,4,8-trienamide, guineensine, pipemonaline, ( 2E, 4E )-N-isobutyl-2, 4-didecadienamide, piperine, piperanine, and piperlonguminine were isolated preparatively.