排序方式: 共有80条查询结果,搜索用时 449 毫秒
61.
崔新军 《军械工程学院学报》1995,(1)
基于综合符合思想,通过诸参数对于弹道影响敏感特性的分析,及诸符合方案的对比论证,提出了在一个射角下,以零阻力系数C_(xo)和相对静力臂系数h/l作为符合系数,以射程X和偏流Z为符合对象的符合方案;同时,与国外符合方案进行了对比。 相似文献
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Nonlinear initial alignment is a significant research topic for strapdown inertial navigation system(SINS).Cubature Kalman filter(CKF)is a popular tool for nonlinear initial alignment.Standard CKF assumes that the statics of the observation noise are pre-given before the filtering process.Therefore,any unpredicted outliers in observation noise will decrease the stability of the filter.In view of this problem,improved CKF method with robustness is proposed.Multiple fading factors are introduced to rescale the obser-vation noise covariance.Then the update stage of the filter can be autonomously tuned,and if there are outliers exist in the observations,the update should be less weighted.Under the Gaussian assumption of KF,the Mahalanobis distance of the innovation vector is supposed to be Chi-square distributed.Therefore a judging index based on Chi-square test is designed to detect the noise outliers,determining whether the fading tune are required.The proposed method is applied in the nonlinear alignment of SINS,and vehicle experiment proves the effective of the proposed method. 相似文献
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The aim of this paper is to investigate the determinants of international arms transfers in a gravity model framework. By distinguishing between the decision to export arms (extensive margin) and the value of the arms exported (intensive margin), while also considering its interdependence, is what differentiates this paper from previous research. A theoretically justified gravity model of trade augmented with political and security motives is estimated using a two-stage panel data approach for 104 exporting countries over the period from 1950 to 2007. In addition to the usual gravity variables related to the economic mass of the trading countries and the trade cost factors, the model is extended with political and security factors. The level of democracy in both trading partners, political differences between trading partners and voting similarity with the United States in the UN General Assembly of the countries engaged in trade are the main political factors, whereas the existence of conflicts, military pacts, and embargoes are taken as security motives. The key result indicates that both political and security motives are an important determinant of an arms trade, but their effects on the extensive margin of exports (the decision to order a transfer) differs from their effect on the intensive margin (average value of exports). Moreover, the relative importance of the factors under study has changed since 1989. In the post-cold war period, countries that are less democratic are more likely to export arms, military pacts are less relevant and embargoes play a role. 相似文献
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李青 《中国人民武装警察部队学院学报》2009,25(9):78-81
构建和谐警民关系在当前公安工作中具有全局性意义。在和谐社会建设正成为时代精神精华的背景下,和谐警民关系的构建不仅具有历史逻辑的可能性,而且具有改善社会关系、化解各种矛盾、维护社会公平正义、全面促进社会和谐的根本意义和现实需求。面对队伍建设的新情况、新局面,和谐警民关系的构建应立足现状,分析局面,寻求对策,以利公安工作和队伍建设再上新台阶。 相似文献
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在指控系统应用过程中,需要审查与系统安全相关的所有操作,并对不安全的操作行为进行报警。根据指控系统中数据库审计四要素的要求,提出将应用系统级审计与数据库级审计相结合的方法,最终实现两种级别审计的统一。解决了以往指控系统审计方式单一的问题,满足了军用数据库安全防护的要求。 相似文献
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决策者、决策辅助人员和指挥决策信息系统是部队指挥决策系统的基本组成部分,防空兵指挥自动化和决策支持系统则是指挥决策信息系统的一部分,环境因素和决策信息是影响防空兵指挥决策系统的重要因素.从系统的观点阐述了防空兵指挥决策系统与内外环境因素的关系,提出在新技术条件下,系统信息是防空兵指挥决策系统的又一组成要素.从这个观点出发,可以准确、全面地了解和分析系统环境因素对防空兵指挥决策系统影响,最终达到提高防空兵指挥决策效能的目的. 相似文献
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社会转型、价值观念的变革对我国青少年的价值取向产生了重大影响,也呈现了新的面貌,具体表现如下:人生价值观日渐趋向多元化;人生行为选择低于理性认识水平,言行脱节现象严重。要改变这样的状况,就需要社会、家庭、学校共同关注,给青少年正确的价值导向。 相似文献
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董静 《中国人民武装警察部队学院学报》2010,26(2):53-57
从分析农村消防工作面临的严峻现状着手,探讨新农村建设中消防工作存在问题的产生原因,以山西省晋城市为例,就做好社会主义新农村建设消防工作的工作要点以及需注意的方面提出了具体的意见和观点。 相似文献