一锅法合成噁唑啉金属配合物研究进展

一锅法合成金属配合物是近年来金属有机化学研究的一个热点之一。在对国内外噁唑啉金属配合物的合成及应用进行大量文献调研基础上,综述了本课题组近年来用腈类与手性氨基醇作用,在不同物质的量的金属盐如氯化锌、乙酸铜和氯化钴等金属氯化物或金属乙酸盐作用下,一锅法一步合成系列噁唑啉金属配合物及应用研究进展。同时,对该方法在其他噁唑啉金属配合物合成及应用领域提出展望。

优势区图的计算机绘制系统

介绍了新开发的优势图计算机绘制系统，提出了绘制优势区图的一种新算法——主元素活度项法，说明了绘制含一种金属的三元系及含两种金属的四元系的优势区图绘制的算法原理，解决了四元系中双金属化合物的归属问题．算法简易，效率高，符合热力学原理．系统采用Ｃ＋＋语言，基于Ｗｉｎｄｏｗｓ３．Ｘ／Ｗｉｎ９５平台编制了优势图绘制系统的应用程序．该系统具有使用简单，维护方便，界面友好，输入少量的信息即可得到完整的优势区图．

Prosthetic Impingement in Total Hip Arthroplasty—The Trigger for Adverse Wear

Development of total hip arthroplasty (THA) now spans more than 5 decades encompassing combinations of metal-on-metal (MOM), ceramic-on-metal (COM), metal-on-plastic (MOP), ceramic-on-plastic (COM), and ceramic-on-ceramic (COC). In every arena of extensive technical development, there exists a data set that when viewed in isolation seemed of little import, but when assembled in-toto may produce a generational shift in perception. Our review focused on two such THA events. Firstly, COC retrieval studies (1999-2001) noted habitual wear patterns on heads and peripheral wear stripes, along with femoral-neck impingement, and ceramic surfaces stained gray by metal debris. These COC data indicated THA risks included, 1) cup edge-loading (E/L) on heads producing “stripe wear”, 2) component impingement releasing metal particles resulting in 3) tissues contaminated by metal debris. A corresponding MOM impingement-debris mechanism was only perceived by Howie (2005) in a McKee-Farrar retrieval study. Our anticipation at LLUMC was that MOM retrievals would provide superior wear details to those seen on COC retrievals. We noted stripe wear in the polar zone of CoCr heads and basal stripes in the non-wear areas. The basal-polar stripe combinations were found in all MOM retrievals. Basal-polar stripe combinations followed cup-rim profiles in our LLUMC simulations of prosthetic impingement. LPUH videos demonstrated the formation of stripe wear in functional-standing and functional-sitting postures for both impingement and subluxation episodes using THA and RA designs. The stripes on CoCr heads revealed the large scratches we now term “microgrooves”. Microgroove width varied from 40 - 400 um with 100 um being typical. The longitudinal striations in microgrooves, the raised jagged lips, scratches with shallow entry and exit termini, were all indicative of a classic 3rd-body wear mechanism. The THA impingement simulations denoted four sites of edge-loading, i.e. neck-E/L, inferior cup-E/L, superior cup-E/l and head-E/L, and ingress of Ti64 particles as a contaminating-roughness effect. Individual MOM cases referred to LLUMC demonstrated dramatic evidence of neck notching. At one end of the debris spectrum, a Ti64-notch model predicting a 6 mm3 annual wear-rate represented the release of 5700 particles of 126 um-size (approximating daily release of 16 particles). At the other end of the spectrum, if metal particles were crushed between MOM surfaces to the equivalent nanometer size found in tissues, our notch model represented approximately 22-trillion Ti64 particles annually deposited in tissues. The anatomical THA models represented in LPUH videos demonstrated that even 1-degree of head subluxation from a rigid cup created a cup “lift-off” scenario (CLO) that would open a gap of 250 - 400 microns between femoral head and cup. This would void all lubrication potential and focus the total hip-joint force along the beveled cup rim, i.e. stripe wear. It is therefore interesting that MOM impingement/debris predictions by Howie et al. have not been confirmed until now or discussed in contemporary literature. Therefore, this review of 50 years of THA data demonstrated that hip impingement was always the trigger for adverse wear and that metal-backed cups represent the potential for release of metal debris at extremes of functional standing and sitting postures.

粉球电阻的理论分析

在粉体金属中,基于理想粉球单轴向压缩变形模型,推导出单个变形粉球的电阻公式,分析了公式自身存在条件和有意义物理的适用范围:即变形端面的半径必须大于零,小于粉球半径;用Mathematica软件绘制了不同参数变化时电阻变化趋势的三维图形,显示其变化规律为:R随变形端面的半径的增加而下降,初始时下降很快,随后降幅趋于平缓;随着粉球半径增大,R先迅速上升,后开始下降,当粉球半径达到一定值后,电阻R接近一水平线.

双金属金属有机骨架材料的制备及性能研究进展

金属有机骨架材料(MOFs)具有拓扑结构的多样性和丰富的比表面积,使其在催化和吸附领域具有潜在的应用价值。双金属MOFs具有两种金属中心,较之单金属MOFs具有更加多元的催化活性位点和吸附位点,因此吸附选择性、选择催化性以及结构稳定性等均得到了提升。本文就如何制备性能优异的双金属MOFs材料,以及这种材料的结构特点、性能提升和应用前景展开了概述。

金属酞菁化合物多晶体的“金属—半导”性转变

本文研究了掺碘酞菁镍多晶体、掺碘酞菁铜多晶体及它们两者混合物的粉末压片的电导率随温度变化的关系,发现有“金属—半导”性转变存在。并探讨了这种转变出现的原因及机理。研究表明这种转变不是导电金属酞菁化合物的结构在某一温度下发生了突变,而是由非均相结构的存在所致。根据非均相模型推导出来的电导率公式对实验结果进行拟合后所得的曲线与实验点相符很好。

智能手机前壳设计方案研究

针对智能手机前壳的设计方案要求,介绍了纯塑胶前壳、塑胶+金属嵌件前壳、一体式金属中框的结构、材质、制作、表面处理的选择方法。

A One-dimensional Linear Polymeric Au(Ⅰ) Compound With Strong Au-Au Interaction: Preparation and Structure of [AuS_2CNEt_2]_(4n)

Dialkyldithiocarbamate （R2NCS-2） acting as either bridging or terminal ligand plays an important role in modern coordination chemistry. The molecules of the univalent coinage metals （Cu, Ag, and Au） with dialkyldithiocarbamate ligands form a class of compounds in which the sterical restriction influences strongly the crystal structures, and several types of polymerizates were found. However, only a few structures in linear form