Gate-tuned Josephson effect on the surface of a topological insulator

In the study, we investigate the Josephson supercurrent of a superconductor/normal metal/superconductor junction on the surface of a topological insulator, where a gate electrode is attached to the normal metal. It is shown that the Josephson supercurrent not only can be tuned largely by the temperature but also is related to the potential and the length of the weak-link region. Especially, the asymmetry excess critical supercurrent, oscillatory character, and plateau-like structure have been revealed. We except those phenomena that can be observed in the recent experiment.     

Development of a novel flexure-based microgripper for high precision micro-object manipulation

Micro-scaled parts with dimension below 1 mm need to be manipulated with high precision and consistency in order to guarantee successful microassembly process. Often these requirements are difficult to be achieved particularly due to the problems associated with the structural integrity of the grasping mechanism which will affect the accuracy of the manipulation. Furthermore, the object's texture and fragility imply that small perturbation by the grasping mechanism can result in substantial damage to the object and leads to the degradation of its geometry, shape, and quality. This paper focuses on the unification of two designing approaches to develop a compliant-based microgripper for performing high precision manipulation of micro-objects. A combination of Pseudo Rigid Body Model (PRBM) and Finite Element Analysis (FEA) technique has proven to improve the design efficiency by providing the essential guideline to expedite the prototyping procedure which effectively reduces the cost and modeling time. An Electro Discharge Machining (EDM) technique was utilized for the fabrication of the device. Series of experimental studies were conducted for performance verification and the results are compared with the computational analysis results. A high displacement amplification and maximum stroke of 100 μm can be achieved.     

孕早期脐血流与出生不良结局的关系

目的:探讨孕早期多普勒超声静脉导管血流异常与围产儿预后的相关性.方法:应用彩色多普勒超声检测同期妊娠11-13+6周于我院产前保健的单胎孕妇胎儿的静脉导管血流频谱.其中静脉导管血流频谱异常者69例为研究组,静脉导管血流频谱正常者143例作为对照组,比较两者的妊娠结局情况.结果:孕11-13+6周胎儿脐血流异常组有3例因严重心脏畸形而中期引产,有1例早产后因严重心脏畸形而夭折;胎儿脐血流正常组无严重异常情况,两组间有显著统计学差异.结论:孕早期静脉导管血流异常与新生儿不良预后有关,包括新生儿死亡、新生儿畸形.孕早期静脉导管血流异常对胎儿心脏畸形诊断的阳性预测价值:4/69＝5.8%,阴性预测价值为100%;早孕期存在静脉导管异常血流应加强围产保健.     

低碳钢在碳化氨水介质中短裂纹疲劳扩展规律的探讨

根据短裂纹的观点，讨论了低碳钢在碳化氨水介质中短裂纹疲劳扩展的规律。得出在短裂纹疲劳扩展范围内，随Δｋ增加，断裂从ＣＦ→ＳＣＦ→Ｆ转变；Δｋ（１ＳＣＣ）≈２１０Ｎ／ｍｍ（３／２）；在腐蚀疲劳条件下外加阴极保护电位促进短裂纹扩展；充氢条件下，大大加速短裂纹疲劳扩展。     

Ni/Al2O3催化制备碳/碳复合材料研究

提出了催化化学气相渗透（CCVI）法制备碳／碳复合材料的新工艺，即在针刺碳布预制体中添加3．5％～4％Ni／Al2O3负载型金属催化剂，以丙烯作碳源气体，在750～900℃下，经过100h的沉积，碳／碳复合材料的密度达到1．68g／cm^3。该材料经高温处理后，氧化失重率低、氧化起始温度高。应用扫描电镜（SEM）、X射线衍射分析（XRD）和偏光显微镜（PLM）观察了基体碳的形貌，初步探讨了催化沉积碳和抗氧化机理。     

“旅游一卡通”系统的研究与设计

通过分析河南旅游的特点,对“旅游一卡通”系统进行了研究与设计。文章阐述了“旅游一卡通”的功能,并对系统的总体设计进行了研究。分析了传统三层应用软件系统的不足,提出了一个适合该系统运行的新的四层体系结构。文章的最后提出了一个“旅游一卡通”计费系统模型.该模型利用了目前国内比较热门的业务规则管理技术,使计费规则与程序代码完全分开,便于计费规则的灵活运用。     

Windows应用程序向Windows CE平台移植的研究

针对嵌入式操作系统Windows CE的特性以及它的编译环境EVC的特点,研究了Windows CE程序与Windows程序的不同之处,提出了程序的移植策略和移植步骤.该方法成功地将某故障诊断专家系统移植到嵌入式系统中并对该系统进行开发和应用.实践表明这种软件移植方法是加快嵌入式系统软件开发效率和提高软件质量的有效途径之一.     

基于竞价的日发电计划混合智能优化算法

针对电力市场下基于竞价的日发电计划的特点，提出一种充分结合遗传算法和排队算法各自优点的混合智能算法。该算法利用遗传算法在求解离散组合优化问题上的强收敛性和鲁棒性进行机组优化组合，利用排队算法的简洁性和快速性进行经济功率分配。同时，利用基于专家知识的免疫遗传算法来提高机组优化组合的计算速度。通过对某实际电力市场基于竞价的日发电计划的计算和分析，验证了该算法的正确性和实用性。     

Fe_3Al反相畴界及择优代位的对势计算

基于由第一性原理计算的结合能曲线经过晶格反演获得的原子间相互作用对势,计算了Fe3Al合金的反相畴界(AntiphaseBoundary,APB)的畴界能,并对DO3型Fe3Al不同位置进行元素代换,计算了合金的择优代位情况,其结果证实或扩充了已知的实验结果.     

酸性亚硫酸盐法蒸煮白松生产描图纸浆初探

本文就松木用酸性亚硫酸盐法蒸煮，生产描图纸浆进行了探讨性试验。对试验所得浆中戊糖含量偏低的原因从理论上进行了分析。同时，提出了提高戊糖含量的改进措施。