[99Tcm(NO)Cl(PL)2]＋类配合物的定量构效关系

用半经验量子化学方法中的ZINDO/1对15种[99Tcm(NO)Cl(PL)2]＋类配合物的结构进行了优化，得到各种物理化学参数和电性参数，并将这些参数对心肌初始摄取值进行多元线性回归分析，得到了4个方程.利用所得方程，提出了该类配合物的心肌摄取机理主要为氧化还原反应机理.     

螯合剂在炸药机械加工防锈切削液中的应用

为了满足不同的装药需求,军用炸药件常被加工成不同的形状。为了保证安全,炸药机械加工必须使用切削液。目前国内外市场尚没有炸药机械加工专用切削液产品出现,相关研究报道也较少。炸药机械加工切削液在与炸药相容的同时,还应具有良好的防锈性能,保证机床和刀具不被锈蚀。碱性     

基于单磨粒微米划刻的单晶硅精密切削机理研究

为了探究硅片器件精密磨削加工的切削特征与机理,运用三棱锥形状的金刚石磨粒以不同加载压力划刻单晶硅材料表面模拟磨削加工过程,分析了划痕形貌特征、切削力与切削深度的演变规律,阐释了单晶硅的微米级切削加工机理。单晶硅微破碎去除发生的临界条件为法向切削力80 mN,临界切削深度2.03 μm;剥落去除发生的临界条件为法向切削力800 mN,切削深度5.65 μm。切削深度、切削力比在不同切削机理条件下具备可区分的差异化特征。平均切削深度随加载压力的变化规律呈现出鲜明的自相似性特征。此外,还分别构建了塑性去除、微破碎去除、剥落去除三个阶段的切削力方程,更准确地描述了切削力与切削深度的密切关系。     

A polyhedral study of the generalized vertex packing problem

The traditional vertex packing problem defined on an undirected graph identifies the largest weighted independent set of nodes, that is, a set of nodes whose induced subgraph contains no edges. In this paper, we examine a generalized vertex packing problem (GVP-k) in which k ``violations' to the independent set restriction are permitted, whereby k edges may exist within the subgraph induced by the chosen set of nodes. A particular context in which such problems arise is in the national airspace planning model of Sherali, Smith, and Trani (2000), where a set of flight-plans need to be composed for various flights subject to conflict, workload, and equity considerations. The GVP-k structure arises in modeling the air-traffic control sector workload restrictions, which stipulate that for each sector and during each discretized time-slot, the number of aircraft conflicts that would need to be resolved should not exceed k, for some k≥1. We derive several classes of facetial valid inequalities for GVP-k for certain specially structured subgraphs, identifying polynomial-sized convex hull representations for some of these cases. Related constraint generation routines are also developed, and some computational results are provided to demonstrate the efficacy of utilizing the proposed valid inequalities in solving GVP-k for different values of k.     

116例冠心病患者血清中10种必需微量元素水平的研究

１１６例冠心病患者血清中１０种必需微量元素的含量与正常值比较，具有如下特点：（１）铁，锌、铬，镍含量升高；２硒钴，钒，钼含量降低；（３）铜和锰差异无显著性。     

Cutting of nonmetallic materials using Nd:YAG laser beam

This study deals with Nd:YAG laser cutting nonmetallic materials, which is one of the most important and popular industrial applications of laser. The main theme is to evaluate the effects of Nd:YAG laser beam power besides work piece scanning speed. For approximate cutting depth, a theoretical study is conducted in terms of material property and cutting speed. Results show a nonlinear relation between the cutting depth and input energy. There is no significant effect of speed on cutting depth with the speed being larger than 30 mm/s. An extra energy is utilized in the deep cutting. It is inferred that as the laser power increases, cutting depth increases. The experimental outcomes are in good agreement with theoretical results. This analysis will provide a guideline for laser-based industry to select a suitable laser for cutting, scribing, trimming, engraving, and marking nonmetallic materials.     

用于不锈钢薄板切割的直接半导体激光源

针对高功率半导体激光器存在的光束质量差、单元功率低的缺点,利用合束技术来提高激光功率及光束质量,配合QBH光纤前端帽优化聚焦镜以实现高效耦合。采用11个条宽5.4 mm的迷你线阵合束,通过光束整形、空间合束、偏振合束和波长合束,聚焦耦合进200μm/0.2光纤。在50 A电流下,实现连续386 W输出,功率密度为1.23 MW/cm2,电光效率为43.6%。在200 W的功率下,该激光器可以切割厚度为1 mm的不锈钢薄板。     

铬,硒,镉,锰与心脑血管疾病

通过对５０例心脑血管疾病病人及５０例健康对照组血中微量元素铬、硒、镉、锰的检测分析证实，心脑血管疾病病人血清Ｃｒ、Ｓｅ含量下降，Ｃｄ含量未见明显升高，并进一步探讨了这些微量元素与心脑血管疾病的发生发展的关系及其临床意义。     

Selection of the most influential factors on the water-jet assisted underwater laser process by adaptive neuro-fuzzy technique

Water-jet assisted underwater laser cutting has shown some advantages as it produces much less turbulence, gas bubble and aerosols, resulting in a more gentle process. However, this process has relatively low efficiency due to different losses in water. It is important to determine which parameters are the most important for the process. In this investigation was analyzed the water-jet assisted underwater laser cutting parameters forecasting based on the different parameters. The method of ANFIS (adaptive neuro fuzzy inference system) was applied to the data in order to select the most influential factors for water-jet assisted underwater laser cutting parameters forecasting. Three inputs are considered: laser power, cutting speed and water-jet speed. The ANFIS process for variable selection was also implemented in order to detect the predominant factors affecting the forecasting of the water-jet assisted underwater laser cutting parameters. According to the results the combination of laser power cutting speed forms the most influential combination foe the prediction of water-jet assisted underwater laser cutting parameters. The best prediction was observed for the bottom kerf-width (R² = 0.9653). The worst prediction was observed for dross area per unit length (R² = 0.6804). According to the results, a greater improvement in estimation accuracy can be achieved by removing the unnecessary parameter.     

基于ZigBee的心脏起搏器定位非接触充电系统研究

非接触充电技术为实现心脏起博器永久供电提供了可能,其可靠性和抗强电磁场干扰的能力还不能满足医学应用的要求。该文提出了一种基于ZigBee的定位非接触充电技术。该方案在心脏起搏器内安装CC2531无线模块,用来实现定位测距、控制体内充电装置、体温检测等功能,此模块也是起搏器的核心控制器件。在病人房间的墙壁上安装3个CC2531无线模块,用于配合测量内置无线模块的位置。在病人的床板下安装体外供电装置(包含非接触供电电路和1个CC2531无线模块),该模块获取其余模块的测距信息,当测定出内置无线模块进入特定地点,且内置电池欠压时,非接触供电系统并向内置的锂电池启动充电。为了提高内置的受电线圈抵御强电磁场干扰的能力,提高非接触供电系统的可靠性,对非接触供电系统的电磁波特性作了理论阐释,并提出了的过压保护的原理,且由此给出了可行的保护电路。仿真与实验证明了以上结论。