USB与RS232接口转换器的设计

针对RS232接口向USB接口转换的需求,提出两类设计方案。一类方案以CY7C68013芯片为代表,从硬件底层固件开始,进行全面系统开发。另一类采用类似CP2102的USB/RS232双向转换专用芯片进行设计,只需对芯片功能了解和应用,无须深入开发。第一类方案由于成本和开发难度的限制而很少被采用,但在特殊的操作系统或专门的应用条件下是优选方案。第二类方案经常被采用,但因受到芯片生产商的限制而无法进行特殊的应用。应用设计人员可以根据实际情况选择适合的方案。     

《易经》之军事学说研究

诞生于殷末、周初的《易经》内容涵盖广泛,涉及到社会生活的方方面面,其中,军事学说占有相当大的比重。它记录了君王、诸侯从和平相处到相互征战的全过程:有作战对象、出征时间的选择,有战略战术的制定、地形与气象的运用,还有作战中的协同配合与后勤补给,及至战后胜利的庆祝以及对待俘虏的态度都有相当细致的描述。这些史料极其珍贵,很值得我们去研究。     

采用保角变换法分析铁磁材料缺陷漏磁场

利用保角变换的方法求出了金属表面缺陷裂纹形状为半椭圆的情况下的漏磁场的模型。介绍了保角变换的过程, 边界等效磁荷的求解过程, 铁磁材料以外自由空间的漏磁场的求解过程, 并讨论了漏磁场与缺陷裂纹的大小的关系, 为缺陷定量提供了理论基础。     

验前信息在武器装备试验中的应用研究

针对武器装备定型试验时如何把验前积累大量的先验信息科学合理利用,根据武器装备不同种类的验前信息,确定其分布类型并采用参数和非参数检验方法进行相容性检验,使经过预处理的验前信息能够为试验所用,并通过实例验证了该方法的科学可行性。该方法对验前信息在武器装备试验及结果评定中的应用具有一定意义。     

基于SysML的车辆信息系统设计

针对目前车辆信息系统缺乏有效设计方法的现状,结合新时期车辆信息系统的特点,提出了一种基于SysML的车辆信息系统设计方法。该方法明确了车辆信息系统设计过程的阶段和产物,并通过标准建模语言SysML的运用,用模型来支持系统的设计和有效性验证。该方法在智能巡航系统的设计中得到了运用。实践结果表明,该方法不仅能够自顶向下完整地设计系统、利用可视化的语言准确清晰地描述系统,而且能够在系统设计层面对系统功能逻辑和数据流进行动态仿真和迭代验证。该方法能够较好地指导新时期车辆信息系统的设计过程,满足信息系统的设计要求。     

Multi-objectives nonlinear structure optimization for actuator in trajectory correction fuze subject to high impact loadings

This paper presents an actuator used for the trajectory correction fuze, which is subject to high impact loadings during launch. A simulation method is carried out to obtain the peak-peak stress value of each component, from which the ball bearings are possible failures according to the results. Subsequently, three schemes against impact loadings, full-element deep groove ball bearing and integrated raceway, needle roller thrust bearing assembly, and gaskets are utilized for redesigning the actuator to effectively reduce the bearings' stress. However, multi-objectives optimization still needs to be conducted for the gaskets to decrease the stress value further to the yield stress. Four gasket's structure parameters and three bearings' peak-peak stress are served as the four optimization variables and three objectives, respectively. Optimized Latin hypercube design is used for generating sample points, and Kriging model selected according to estimation result can establish the relationship between the variables and objec-tives, representing the simulation which is time-consuming. Accordingly, two optimization algorithms work out the Pareto solutions, from which the best solutions are selected, and verified by the simulation to determine the gaskets optimized structure parameters. It can be concluded that the simulation and optimization method based on these components is effective and efficient.     

Fullerene bisadduct stabilizers: The effect of different addition positions on inhibiting the autocatalytic decomposition of nitrocellulose absorbed nitroglycerin

To explore the effect of different positions and number of pyrrolidine bound to the carbon cage on the stabilization effect of fulleropyrrolidine derivatives to nitrocellulose (NC)/nitroglycerine (NG), we synthesized N-(4-methoxy) phenylpyrrolidine-C₆₀ and four different of bis(N-(4-methoxy) phenylpyrrolidine)-C₆₀ compounds through Prato reaction. Their structures were characterized by UV–vis, ¹H NMR, ¹³C NMR, high-resolution mass spectroscopy, and single-crystal X-ray diffraction. Their stabilization effect to NC/NG were investigated using differential scanning calorimetry, methyl violet, vacuum stabilization effect, weight loss, and accelerating rate calorimeter tests. The results indicated these compounds had excellent stabilization effect to NC/NG. The stabilization effect of the fulleropyrrolidine bisadducts to NC/NG is significantly better than that of fulleropyrrolidine monoadduct and C₆₀. Moreover, the position where pyrrolidine binds to fullerene in fulleropyrrolidine bisadducts is different, and its stabilization effect to NC is also different. The stabilization effect order of different bisadduct isomers to nitrocellulose is as follows: e-edge > trans-2> cis-2> trans-3. Electron paramagnetic resonance (EPR) and FT-IR were used to study the stabilization mechanism of fulleropyrrolidine derivatives to NC/NG. The EPR results also show that fulleropyrrolidine bisadducts with different addition sites have different abilities to absorb nitroxide, and their ability is better than that of the monoadduct and C₆₀, which is consistent with the results of stabilization effect performance test.     

过程方法在防化科研质量管理系统中的应用

介绍了根据国军标要求建立的科研质量管理系统．运用“过程方法”,对现行科研体制下的科研进程进行了识别,并提出了具体的控制要求。     

中国古代军事情报保密思想述略

文章认为中国古代兵家对于军事情报保密重要性的认识极为深刻、对于军事情报保密的法令极为严厉、对于在对外交往过程中军事情报保密和防奸防谍极为重视、对于军事情报传递和应用中保密及其技术方法的描述极为具体。同时,也存在着论述较为零散、艰涩、简单和走极端,以致愚弄士卒等明显的不足。     

帕罗斯远征与雅典海军的发展

公元前489年的帕罗斯远征是雅典海军发展史上一个重要的转折点,同时也对雅典民主的进一步深入发展起到了积极作用。米太亚德是第一个认识到海军重要性的雅典领导人,是雅典发展海上政策的先驱,泰米斯托克利只是其追随者。通过对帕罗斯远征的研究,对于我们深入认识海军的发展与雅典民主之间的关系将有所裨益。