对象中间件技术及其发展趋势

指出了中间件是位于操作系统和应用软件之间的一类系统软件，它简化了分布式应用系统的开发．概述了中间件的含义，给出了中间件的一种分类方式，比较了现存的对象中间件模型，提出了对象中间件今后的发展方向及需要解决的关键问题．     

半导体热电材料Bi1-xSbx薄膜的电化学制备

B I1-XSBX半导体合金是性能优异的热电和磁电功能材料,为制备固态电制冷器件、温差发电器件和磁电器件的重要材料。电化学沉积薄膜技术工艺设备简单成本低,在半导体薄膜制备方面有很好的应用前景。系统研究了高浓度盐酸(2.4 MOL/L)的B I和SB盐酸溶液,成份从纯铋逐步变化到纯锑的B I1-XSBX合金半导体薄膜电化学沉积特性。测试了沉积过程I-V循环曲线和和沉积电荷效率等电化学参数。结果表明在所有成份范围内都可以得到典型的B I1-XSBX固溶体结构的高质量薄膜。薄膜生长为典型的溶液扩散控制过程,具有高的沉积电荷效率。薄膜沉积和溶解之间的电位差随溶液中SB(Ⅲ)离子浓度增加而增大,生长的薄膜越来越稳定。在30%SB浓度附近,电化学过程、薄膜结构和性能发生明显的突变。应用X射线衍射和电子显微镜研究薄膜结构,发现薄膜具有明显的(012)择优取向,薄膜晶粒尺寸也随SB浓度的增加而变化。     

具有充分下降性的修正PRP算法及其收敛性

共轭梯度法因其算法简单、存储需求小,非常适合于求解大规模优化问题。在所有的共轭梯度法中,PRP方法被认为是数值表现最好的方法之一。然而,对一般非凸函数,PRP方法即使采用精确线搜索也不能保证全局收敛。本文基于一个修正的PRP公式,提出了一类无需线搜索而具有充分下降性的共轭梯度算法。在一定条件下,建立了该算法的全局收敛性结果。数值试验表明这种改进是有效的。     

多重上市股价异常效应的影响因素——来自中国A、B股证券市场的证据

实证检验了多重上市的股价异常效应及其影响因素。结果表明,多重上市的股价异常效应并非市场过度反应的结果,而与A、B股的市场分割、发行价格与原股票价格的差异、上市前后流动性的变化紧密联系。另外,A股市场多重上市的股价异常效应主要表现在招股公告前,B股市场多重上市的股价异常效应则主要表现在招股公告后。从股东构成、时间因素、散户投资者的损失厌恶心理方面探讨了以上不对称反应模式的原因。     

市场分割下的股价微观行为及其行为金融学解释

以交易量、股价波动率和收益率的自相关性作为流动性、波动性和价格有效性等微观行为指标,实证分析了中国A股和B股市场在微观行为上的差异.结果发现,三个指标在两个市场之间存在显著差异.在B股向境内居民开放前,A股的三个指标都要显著大于B股.而B股开放之后,B股的这些指标都大于开放之前.最后运用行为金融理论中投资者结构对微观行为的影响进行了分析和解释.     

一阶循环到达角估计及其在干涉仪中的应用

研究了基于信号一阶循环平稳特性的空间源信号到达角估计方法,推导得到了在双阵元条件下的测角方法和测角精度,以及空间干扰信号对测角性能的影响,并与传统干涉仪测角性能进行了比较。理论分析和仿真结果说明,基于一阶循环平稳特性的空间源信号到达角估计方法,不仅具有和干涉仪近似一致的单目标测角性能,并且能同时实现对多个具有不同一阶循环频率的目标信号的测向,这是传统干涉仪所不具备的。     

Rare earth effect of yttrium on formation and property of Cr_2O_3 oxide film formed on Co-Cr binary alloy

The isothermal oxidizing kinetics of Co-40Cr alloy and its yttrium ion-implanted samples were studied at 1000 ℃ in air by thermal-gravity analysis (TGA). Scanning electronic microscopy (SEM) was used to examine the Cr2O3 oxide film's morphology after oxidation. Secondary ion mass spectrum (SIMS) method was used to examine the binding energy change of chromium caused by Y-doping and its influence on formation of Cr2O3 film. Acoustic emission (AE) method was used in situ to monitor the cracking and spalling of oxide films formed on both samples during oxidizing and subsequent air-cooling stages. Theoretical model simulating the film fracture process was proposed to analyze the acoustic emission spectrum both on time domain and on AE-event number domain. It is found that yttrium ion-implantation can remarkably reduce the isothermal oxidizing rate of Co-40Cr and improve the anti-cracking and anti-spalling properties of Cr2O3 oxide film. Reasons for the improvement are mainly that the implanted yttrium can reduce the grain size of Cr2O3 oxide, increase the high temperature plasticity of oxide film, and remarkably reduce the number and size of Cr2O3/Co-40Cr interfacial defects.     

Microbial starch-binding domains are superior to granule-bound starch synthase I for anchoring luciferase to potato starch granules

Microbial starch-binding domains (SBD) and granule-bound starch synthase I (GBSSI) are proteins which are accumulated in potato starch granules. The efficiency of SBD and GBSSI for targeting active luciferase reporter proteins to granules during starch biosynthesis was compared. GBSSI or SBD sequences were fused to the N- or C-terminus of the luciferase (LUC) gene, via an artificial Pro-Thr encoding linker sequence. The genes were introduced into an amylose-free (amf) potato mutant. It appeared that SBD was superior to GBSSI as a targeting sequence, mainly because the luciferase retained higher activity in the SBD-containing fusion proteins than in the GBSSI-containing ones.     

基于EXCEL和MATLAB的矩形薄片热传导计算与仿真研究

对二维导热问题进行了离散化研究,推导出了节点差分方程,以矩形薄片为例,用MS.Excel对节点温度进行了计算,用MATLAB对计算结果进行了仿真,得到了薄片的温度分布仿真图.