手性schiff碱金属配合物N,N‘—双水杨醛缩—1,2—环己二胺合镍（Ⅱ） …

利用经外、拉曼光谱研究一种手性ｓｃｈｉｆｆ碱金属配合物Ｎ,Ｎ’－双水杨醛缩－１,２－环己二胺合镍（Ⅱ）的结构特点。表明（Ｒ,Ｒ）－ＳＡＬＥＮ－Ｎｉ（Ⅱ）和（Ｓ,Ｓ）－ＳＡＬＥＮ－Ｎｉ（Ⅱ）的光谱完全相同,而与外消旋体的光普有很大差别。     

水泵水润滑导轴承耐久性研究

水泵水润滑导轴承的耐久性主要取决于轴瓦材料的耐磨性.以常用的橡胶导轴承为例,分析了轴瓦磨损速率的影响因素及影响规律,建立了轴瓦磨损速率的计算公式.以某泵站为例,确定了导轴承橡胶轴瓦磨损速率各个影响因素的取值范围及概率密度函数,建立了基于可靠度的导轴承耐久性理论,计算了基于可靠度的水润滑橡胶导轴承的运行寿命.结果表明:水体含沙量对橡胶轴瓦磨损速率影响较大.橡胶导轴承采用清水润滑时,具有95%可靠度的运行寿命为4.2 a;而采用含沙量为0.15%的河水润滑时,具有95%可靠度的运行寿命仅为0.5 a.研究结果对合理确定水润滑导轴承的润滑介质和检修周期,提高其可靠耐久性具有重要意义.     

锂离子电池正极材料LiNi1/3Co1/3Mn1/3O2在不同电解液中的性能研究

应用低热固相合成法制备锂离子电池正极材料L iCo1/3N i1/3Mn1/3O2.研究该材料的结构与形貌,并比较它在商品L iPF6盐和在实验室合成的L iBOB(L iB(C2O4)2)盐电解液中的电化学性能.在L iPF6/EC+DMC+DEC电解液中,该材料表现出优良的电化学性能,其于0.5C、1C、1.5C、2C、3C放电倍率的初始比容量依次为167、163、163、157、147mAh/g,电池的循环性能也较好,说明低热固相合成的材料的有较好的高倍率性能.在L iBOB/EC+DEC+DE电解液中,0.5C倍率下比容量为160 mAh/g,较之L iPF6盐电解液的相差不大,但在高倍率下的比容量有所下降.     

改性LiClO_4－（PEO）_（20）电解质锂离子迁移数的测定

采用交流阻抗和恒电位计时电流法测定了ＬｉＣｌＯ４·（ＰＥＯ）２０·（ＰＣ）１２·（ＥＣ）１２高分子电解质的锂离子迁移数。在非水溶液和高分子电解质中,锂是热力学不稳定的,表面生成一层固体电解质钝化膜,严重地影响了锂离子迁移数的准确测定。本方法避免固体电解质钝化膜的影响,给出正确的锂离子迁移数测定值,实验表明,ＬｉＣｌＯ４·（ＰＥＯ）２０·（ＰＣ）１２·（ＥＣ）１２电解质的电导率为０．８×１０－３／ｃｍ,锂离子迁移数为０．３。     

氧化铝柱上的Beckmann重排反应——一个新的异︽唑啉环合付产物

By using Beckmann rearrangement on alumina to prepare 7α-acetylamino-6, 14-endo-etheno-tetrabydrothebaine (2a) and its N-allyl analogue (2b) from the corrssponding ketoxime tosylates (1a and 1b), we obtained novel isoxazoline by-products (3a and 3b). Their structures were determined by IR, ^1H NMR, MS and elemental analyses. The mechanism of this side reaction was beiefly discussed.     

Lumped modeling with circuit elements for nonreciprocal magnetoelectric tunable band-pass filter

This paper presents a lumped equivalent circuit model of the nonreciprocal magnetoelectric tunable microwave bandpass filter.The reciprocal coupled-line circuit is based on the converse magnetoelectric effect of magnetoelectric composites,includes the electrical tunable equivalent factor of the piezoelectric layer,and is established by the introduced lumped elements,such as radiation capacitance,radiation inductance,and coupling inductance,according to the transmission characteristics of the electromagnetic wave and magnetostatic wave in an inverted-L-shaped microstrip line and ferrite slab.The nonreciprocal transmission property of the filter is described by the introduced T-shaped circuit containing controlled sources.Finally,the lumped equivalent circuit of a nonreciprocal magnetoelectric tunable microwave band-pass filter is given and the lumped parameters are also expressed.When the deviation angles of the ferrite slab are respectively 0° and45°,the corresponding magnetoelectric devices are respectively a reciprocal device and a nonreciprocal device.The curves of S parameter obtained by the lumped equivalent circuit model and electromagnetic simulation are in good agreement with the experimental results.When the deviation angle is between 0° and 45°,the maximum value of the S parameter predicted by the lumped equivalent circuit model is in good agreement with the experimental result.The comparison results of the paper show that the lumped equivalent circuit model is valid.Further,the effect of some key material parameters on the performance of devices is predicted by the lumped equivalent circuit model.The research can provide the theoretical basis for the design and application of nonreciprocal magnetoelectric tunable devices.     

中国原子能科学研究院的长寿命核素加速器质谱测量及其应用(英文)

加速器质谱是近年来蓬勃发展的一种十分活跃的核分析技术,其应用涉及环境科学、地质学、核物理及天体物理、生物医学等多个领域。中国原子能科学研究院的加速器质谱装置自从1989年建立至今,已经对^36Cl,^10Be,^129I,^26Al,^79Se和^41Ca等多种核素进行了成功测量。介绍了中国原子能科学研究院的加速器质谱计系统、核素的测量原理及几种相关核素的成功应用。The Accelerator Mass Spectrometry facility at the China Institute of Atomic Energy was established in 1989. The measurement methods for interesting nuclides such as ^36Cl, ^10Be, ^129I, ^26Al, ^79Se and ^41Ca etc. have been established and studies on their applications have been carried out. The facility and some interesting applications are briefly introduced.     

光致变色水杨醛缩胺类Schiff碱的荧光性质

测字了双杨醛缩邻苯二胺（１）,缩对苯二胺（２）、缩１,２－环已二胺（３）、缩乙二胺（４）、缩１,６－已二胺（５）中和水杨醛缩a－苯乙胺（６）在溶液中以及固态时的荧光光谱,研究了Ｓchiff减１,３,４,５和６在固态和溶液中的光致变色行为。     

微波辐射一锅法合成1-羧甲基-3-甲基咪唑四氟硼酸离子液体

以N-甲基咪唑为原料,微波辐射一锅法合成了1-羧甲基-3-甲基咪唑四氟硼酸离子液体,其结构经1HNMR和IR表征。     

纳米TiO_2材料对人类健康的环境风险分析

纳米二氧化钛具有卓越的物理化学性能,在环境、医学、电子信息等众多领域得到了广泛的应用.然而,随着纳米二氧化钛材料的广泛应用,它给环境及人类健康带来的潜在风险也开始引起人们的关注.相关研究表明,纳米二氧化钛颗粒或含纳米二氧化钛的材料对某些生物具有明显的毒性作用,且在特定条件下这种毒性作用会加强.本文对目前有关纳米二氧化钛应用中有关环境及健康风险的文献进行了综述,在介绍纳米二氧化钛材料在光催化作用等领域应用的基础上,分析了其对环境及人类健康可能带来的潜在风险,并提出了目前研究中存在的不足及进一步研究的建议.