关于局部对称空间的几个Pinching定理

研究了局部对称空间中具有平行平均曲率向量的紧致伪脐子流形,利用活动标架法和Hopf极大值原理讨论了子流形的Pinching问题,即估算子流形第二基本形式模长的平方的Laplacian,再对截面曲率和Ricci曲率加以某种限制,得到这类子流形成为全脐子流形的几个拼挤定理.     

高速椭圆曲线密码协处理器的设计与实现

为提高椭圆曲线密码协处理器的性能,首先提出了一种改进的蒙哥马利模乘算法以及针对该算法的流水线结构,然后对椭圆曲线的点加和点倍计算流程进行优化,充分发挥模乘单元的流水线优势,使得协处理器计算参数为256 b的点乘只需要232 704个时钟周期.实验结果表明:在Cycloe Ⅱ EP2C35芯片上实现协处理器需要21000个基本单元,位长为256 b的点乘的计算性能达到1287次/s.     

基于Speech SDK的语音应用程序实现

利用Microsoft Speech SDK的API for Text-to-Speech和API for Speech Recognition,采用Visual Basic 6．0语言,建立文本语音转换应用程序和实现语音识别程序,简单地实现了语音识别的功能,识别出来的内容即可保存为文件,也可作为命令使用,让计算机执行某项操作。     

Trajectory shaping guidance law based on virtual angle with terminal constraints

A trajectory shaping guidance law based on virtua angle （TSGLBVA） is proposed for a re-entry vehicle with the constraints of terminal impact angles and their time derivatives. In the view of differential properties of the maneuvering trajectory, a virtual angle and a virtual radius are defined. Also, the shaping trajectory of the vehicle is established by the polynomials of the virtual angle. Then, four optimized parameters are selected according to the theorem of parameters transformation presented in this paper. Finally, a convergent variant of the Nelder-Mead algorithm is adopted to obtain the reference trajectory, and a trajectory feedback tracking guidance law is designed. The simulation results demonstrate that the TSGLBVA ensures the re-entry vehicle to impact a target precisely from a specified direction with smal terminal load factor command, as well as to obtain a maximum or constrained terminal velocity according to various requirements.     

磁流变减振器优化设计及特性试验

针对某轻型军用轮式越野车辆的减振需求,设计磁流变减振器(Magneto-rheological Damper, MRD)代替原被动减振器。以平板模型推导MRD阻尼力模型,讨论了结构参数对阻尼力和可调系数的影响。针对结构参数难以确定的问题,采用多目标遗传算法(Multi-objective Genetic Algorithm, MOGA)对参数进行优化,并通过磁场分析进行验证。对MRD进行性能试验,并利用最小二乘法对建立的MRD多项式模型进行校验。结果表明：可调阻尼力与可调系数间呈反比关系,利用MOGA可有效优化MRD结构参数,试验结果与设计值基本吻合,所建立的MRD模型与试验结果一致性较好。     

异菸酸的表面增强喇曼散射(SERS)光谱

自七十年代中期Fleischmann等发现表面增强喇曼散射(Surface EnhancedRaman Scattering,简称SERS)以来,SERS研究已成为光散射研究中一个很活跃的领域。Fleischmann最早发现吸附在银电极表面吡啶的SERS光谱,以后Creighton等得到了吡啶吸附在金和银溶胶颗粒上的SERS光谱,还发现了岛膜表面吸附分子(离子)的SERS光谱。目前,半导体表面的SERS现象研究进一步引起人们的关注。本文就首次观察到的异菸酸在银溶胶上的SERS光谱及异菸酸在银电极上的SERS光谱作简单介绍。     

CTS及M-CTS与Men+的配位

进行了ＣＴＳ的降解,研究了ＣＴＳ及Ｍ－ＣＴＳ与Ｍｅｎ＋的配位．用光谱分析ＣＴＳ及Ｍ－ＣＴＳ与Ｍｅｎ＋的配位结果,提出ＣＴＳ及Ｍ—ＣＴＳ的配位规律．即不同分子量ＣＴＳ的配位能力,低分子量大于高分子量;不同基团的配位能力：－ＮＨ２＞＞—ＯＨ＞—Ｃ＝Ｏ不同金属离子与相同分子量的ＣＴＳ配位,基本遵循与游离氨配位规律．     

Respective roles of short-and long-range interactions in protein folding

A new method was presented to discuss the respective roles of short- and long-range interactions in protein folding. It‘s based on an off-lattice model, which is also being called as toy model. Simulated annealing algorithm was used to search its native conformation. When it is applied to analysis proteins lagt and laho, we find that helical segment catmot fold into native conformation without the influence of long-range interactions. That‘s to say that long-range interactions are the main determinants in protein folding.     

风车草泡板型浮岛在污染河水中的脱氮试验

介绍了泡板型浮岛在污染河水中的脱氮试验.实验表明浮岛植物的脱氮效能依次为:风车草>香根草>菖蒲.研究了去除负荷与覆盖率及进水负荷之间关系,结果表明以30%覆盖率为分界点,去除负荷与覆盖率之间的关系有明显的变化;去除负荷与进水负荷之间满足二次函数关系.最后得出了实验条件下的最适宜的覆盖率和进水负荷.