浅谈云计算在公安警卫信息化工作中的应用与发展前景

随着公安警卫部队信息化建设的全面高速发展,云计算技术将更多地应用于警卫信息化建设。展望云计算在警卫信息化建设中的应用前景,分析当前警卫信息化建设中运用云计算技术所面临的问题及对策。     

基于Q-MMSPF的海杂波多重分形互相关分析和目标检测

提出一种研究长程互相关和多重分形的新方法——Q阶混合矩结构分割函数法(Q-MMSPF),并利用Q-MMSPF分析了海杂波时间序列的多重分形互相关特征。通过对实测海杂波数据的计算分析发现,海杂波互相关多重分形特征较弱,目标信号之间的互相关多重分形特征明显,而目标信号与海杂波之间的互相关多重分形程度介于二者之间。据此,本文采用一种新的特征值进行海杂波背景下的目标检测。通过对不同条件下的实测海杂波数据验证,表明使用本文提出的特征值测量方法可以十分有效地检测出海杂波背景下的小弱目标。     

Performances and direct writing of CL-20 based ultraviolet curing explosive ink

A new type of explosive ink formulation that can be quickly cured was prepared with unsaturated polyester as binder,styrene as active monomer,2,4,6-trimethylbenzoyl-diphenylphosphine oxide as photoinitiator,and hexanitrohexaazaisowurtzitane (CL-20) as the main explosive.Then the explosive ink direct writing technology was used to charge the micro-sized energetic devices,the curing mechanism of the explosive ink was discussed,and the microstructure,safety performance and explosive transfer performance of the explosive ink molded samples were tested and analyzed.Results indicate that the composite material has a fast curing molding speed,its hardness can reach 2H within 8 min.The crystal form of CL-20 in the molded sample is still ε type.The CL-20 based W-curing explosive ink formulation has good compatibility,its apparent activation energy is increased by about 3.5 kJ/mol.The composite presents a significant reduction in impact sensitivity and its characteristic drop height can reach 39.8 cm,which is about 3 times higher than the raw material.When the line width of charge is 1.0 mm,the critical thickness of the explosion can reach 0.015 mm,and the explosion velocity is 7129 m/s when the charge density is 1.612 g/cm3.     

Numerical investigation of the failure mechanism of cubic concrete specimens in SHPB tests

Cylindrical specimens are commonly used in Split Hopkinson pressure bar (SHPB) tests to study the uniaxial dynamic properties of concrete-like materials.In recent years,true tri-axial SHPB equipment has also been developed or is under development to investigate the material dynamic properties under tri-axial impact loads.For such tests,cubic specimens are needed.It is well understood that static material strength obtained from cylinder and cube specimens are different.Conversion factors are obtained and adopted in some guidelines to convert the material strength obtained from the two types of specimens.Previous uniaxial impact tests have also demonstrated that the failure mode and the strain rate effect of cubic specimens are very different from that of cylindrical ones.However,the mechanical background of these findings is unclear.As an extension of the previous laboratory study,this study performs numerical SHPB tests of cubic and cylindrical concrete specimens subjected to uniaxial impact load with the validated numerical model.The stress states of cubic specimens in relation to its failure mode under different strain rates is analyzed and compared with cylindrical specimens.The detailed analyses of the numerical simulation results show that the lateral inertial confinement of the cylindrical specimen is higher than that of the cubic specimen under the same strain rates.For cubic specimen,the corners are more severely damaged because of the lower lateral confinement and the occurrence of the tensile radial stress which is not observed in cylindrical specimens.These results explain why the dynamic material strengths obtained from the two types of specimens are different and are strain rate dependent.Based on the simulation results,an empirical formula of conversion factor as a function of strain rate is proposed,which supplements the traditional conversion factor for quasi-static material strength.It can be used for transforming the dynamic compressive strength from cylinders to cubes obtained from impact tests at different strain rates.     

试论教师职业纪律的他律、自律与遵守

教师职业纪律是教师职业道德的构成因素之一,是教师必须遵守的行为规范。职业纪律必须通过后天的教育、学习,尤其是通过教师职业道德向教师个体道德的内化才能实现其作用。因此,研究教师职业纪律的他律与自律及二者的关系,以及遵守教师职业纪律的有效途径,对于提高教师职业道德教育的针对性和实效性,提高教师队伍的整体道德素质与职业道德水平,都有着积极的意义。     

螺旋桨梢涡卷起数值计算

通过解析公式计算得到面源和面偶的诱导速度,在面偶附近区域,用涡环代替面偶,计算得到螺旋桨的速度场,根据尾涡面必须和当地流体流速相切的原则,修正原来尾涡面的形状,逐步迭代直至尾涡形状收敛,用这种方法预报了三维水翼和螺旋桨的尾涡面的形状和梢涡卷起,与试验结果有较好的一致性。     

电子信息化武器装备标准化发展趋势

本文从电子信息化武器装备的概念和标准化工作出发,简要分析了以美军为主的外军电子信息化武器装备标准化发展趋势。并结合我国的国情分析了我军电子信息化武器装备的发展趋势与对策。     

用科学发展观筹划指导信息化武器装备建设

发展信息化武器、建设信息化军队、打赢信息化战争是我军建设信息化军队的必然选择。用科学发展观指导信息化武器装备建设,要按照全面发展思想,从顶层设计、整体效益、系统思维筹划指导信息化武器装备建设;要按照协调发展思想,从信息化武器平台配套建设、信息化武器系统软硬件建设和重点武器配套建设筹划指导信息化武器装备建设;要按照可持续发展思想,从提高武器装备的信息化程度、提高我军武器装备的自主研发能力、搞好我军武器装备的梯次发展和加强武器装备建设人才培养筹划指导信息化战争武器装备建设与发展。     

项目管理标准比较研究

从指导思想、体系结构、核心要素等方面对美国项目管理学会(PMI)编制的PMBOK2004、英国政府商务部(OGC)开发的PRINCE2、国际项目管理协会(IPMA)编制的ICB3.0、项目管理研究委员会组织编写的《中国项目管理知识体系》(C-PMBOK)等项目管理标准进行比较分析,从中为我们指导和规范国防科技工业领域的项目管理提供借鉴。     

美国推进军民一体化的主要措施

美国强调要“利用民用经济中发生的高新技术爆炸来实现国防科技的跨越式发展”,因此美国国会、政府和国防部一直在积极地采取措施推进军民一体化的进程。由于军民一体化问题复杂、涉及面广,所以美国通过制定法规、实施高科技计划,设立开发机构、消除技术壁垒、培育创新主体等五个方面的措施,推进军民一体化的快速形成,以确保美国在21世纪的绝对军事优势。