A Facile Synthesis of Squamosamide Cyclic Analogs

A series of novel cyclic derivatives have been synthesized by utilizing a nickel powder mediated radical cyclization as the key step. The structures of the new compounds were confirmed by ^lH-NMR and MS.     

有限域上互反本原正规元的存在性

设q是素数方幂,n是正整数,Fqn是qn个元素的有限域．本文证明了:当正整数n≥32时,对任意的素数方幂q,存在Fqn中的本原元ξ满足ξ和ξ-1都是Fqn 在Fq上的正规元,也即{ξ,ξq,…,ξqn-1}和{ξ-1,ξ-q,…,ξ-qn-1)都构成Fqn在Fq 上的本原正规基．     

DEA评价与排序的新方法

文章简要回顾了 DEA(Data Envelopment Analysis)方法在先进制造技术 AMT(AdvancedManufacturing Technology)评价以及在其它领域中的研究、应用现状 ;分析了 DEA方法及其改进形式在决策单元有效性评价与排序中存在的问题 ,提出了解决这些问题的新方法     

On the solitonic structures of the cylindrical dust-acoustic and dust-ion-acoustic waves with symbolic computation

Dusty plasmas can support the dust-ion-acoustic and dust-acoustic modes, modelled by the cylindrical Korteweg–de Vries equation as proposed. In this Letter, we point out that there exist a couple of problems in the plasma-physics literature on the cylindrical Korteweg–de Vries equation, i.e., the claim of non-existence of exact analytic solutions and omission of varying ambient field, to which we provide our answers. With symbolic computation, we obtain a family of exact analytic, solitonic solutions, of which the previous solutions in plasma physics turn out to be the special cases. With figures, we work out some possibly observable effects for the future plasma experiments, featured by a solitonic pulse aboard the varying ambient field propagating with its varying velocity and amplitude.     

Facile Yb(OTf)3 promoted one-pot synthesis of polyhydroquinoline derivatives through Hantzsch reaction

Yb(OTf)₃ catalyzed efficient Hantzsch reaction via four-component coupling reactions of aldehydes, dimedone, ethyl acetoacetate and ammonium acetate at ambient temperature was described as the preparation of polyhydroquinoline derivatives. The process presented here is operationally simple, environmentally benign and has excellent yield. Furthermore, the catalyst can be recovered conveniently and reused efficiently.     

三维回旋自共振微波放大器的理论计算

给出了三维回旋自共振微波放大器（ＣＡＲＭ）的电于运动方程和光场演化方程，并在忽略束流空间电荷效应的前提下，编制了单模放大器程序。利用数值模拟详细考察了电子束束流质量对微波输出功率的影响，模拟结果与实验值符合得很好。     

新型杀菌剂β—甲氧基丙烯酸甲酯类化合物的合成方法概述

对新型杀菌剂β－甲氧基丙烯酸甲酯类化合物的合成方法进行了总结和概述，参考文献７篇。     

同步辐射讲座第一讲 同步辐射XAFS实验站及其应用

介绍了北京和合肥同步辐射XAFS实验站的性能参数和结构, 及在物理，化学，材料和生命科学等研究领域的应用，便于国内广大用户更好地利用其开展高质量的研究工作。     

Synthesis, Characterization, Spectroscopic Properties of 2-（4-Dimethylaminophenyl）-5-fluoro-6-（morpholin-4-yl）-1H-benzimidazole and its Interaction with Calf Thymus DNA

Benzimidazole compounds have attracted a renewed interest recently owing to theirpotential applications in high-performance composite materials, electronic chemicals,photosensitive materials, and their special potentials in biological and/or medicinalapplication1,2. Typically, aromatic compounds with near planar structures and contain-ing hydrogen-donor groups or groups, which are capable of being protonated, havespecial interactions with DNA via intercalation, hydrogen-bonding, and so on3.Me…     

p-adic Transcendence and p-adic Transcendence Measures for the Values of Mahler Type Functions

We prove the p-adic transcendence and p-adic transcendence measures for the values of some Mahler type functions.