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警务绩效评估有利于强化警察机构的组织管理,提高警察的工作效能。针对警务绩效的综合评价问题,制定了警务绩效评估原则,建立了多因素、多层次的警务绩效评价指标体系,并基于模糊数学的评判理论,提出对警务绩效进行整体评价的多级模糊综合评价方法,最后通过一个应用实例,验证了该方法的有效性和实用性。 相似文献
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文章对企业信息安全需求进行了分析,通过对信息安全管理标准BS7799描述,分析了其风险管理各要素间的关系,并定义了一种风险评估的基本流程,在此基础上构建了一种适于企业的风险分析法。 相似文献
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实验以NaCl-KCl-NaF为电解质体系,WO3为原料,利用循环伏安法、计时电位法、计时电流法和方波伏安法, 研究温度为973 K时钨离子在钨电极上的电化学过程.结果表明:W(Ⅵ)离子的还原过程分2步进行,第1步还原过程为两电子转移,电极反应方程式为W6++2e-→W4+; 第2步还原过程为四电子转移过程,电极反应方程式为W4++4e-→W,且都为准可逆反应. W(Ⅵ)离子在钨电极上的还原过程受扩散控制,扩散系数为1.05×10-9 cm2/s. 相似文献
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针对当前我国大气污染防治正逐步由污染治理转向风险防控,而现有空气质量监测设备和平台服务仅限于环境监测而非暴露监测的问题,设计研发了一套基于B/S架构的可视化综合分析与决策支持平台——大气污染暴露风险测量系统(APERMS)。首先,基于大气污染浓度监测数据和暴露时空行为活动模式,耦合集成污染浓度制图、个体暴露测量、人群暴露测量、暴露风险评价这一完整的大气污染暴露风险测量技术路线;其次,基于高可用和可靠原则,进行系统的总体架构设计、数据库设计和功能模块设计;最终,采用GIS与J2EE Web等技术,完成APERMS开发,实现了大气污染浓度分布高时空分辨率模拟、个体和人群大气污染暴露状况精准评估、大气污染暴露风险水平全方位评价等功能。APERMS主要应用于大气污染监控和环境健康管理行业,为风险规避和污染防控提供有效的技术支持。 相似文献
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《Materials Letters》2004,58(27-28):3613-3617
Miscibility and crystallization of linear low-density polyethylene (LLDPE)/poly(ethylene-co-vinylacetate) (EVA) blends were investigated by optical microscopy (OM) and differential scanning calorimetry (DSC). It was found that there existed liquid–liquid phase separation (LLPS) below 220 °C over the whole composition. However, the depression in the crystallization temperature, melting temperature and equilibrium melting temperature of LLDPE all indicated that this polymer pair was partially miscible. The crystallization and melting behavior of LLDPE were determined by the dilute effect of non-crystalline EVA and the probable co-crystallization of parts of EVA chains with LLDPE chains. The crystallization and melting behavior of EVA was determined by the competence between a nucleation effect of LLDPE crystals and partial miscibility between this polymer pair, which was different from that of LLDPE. 相似文献
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我国政务系统中缺乏统一的接口与平台,使得数据共享与访问困难。文章针对电子公文系统的交换特征与传递规律,结合消息中问件技术,提出了一种基于消息中间件的松耦合电子公文传递解决方案,以解决在异构环境下正确、高效地传递和交换电子公文的问题。 相似文献
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《Ceramics International》2017,43(15):11848-11854
LiNi0.5Co0.2Mn0.3O2 (523) coated with ~ 20 nm thick Y2O3 nano-membrane is prepared via a sol-type chemical precipitation process based on electrostatic attraction between the materials. The nano-Y2O3-coated 523 cathode can deliver 160.3 mA h g−1 (87.8% of its initial discharge capacity) after 50 cycles at 1 C (180 mA g−1) between 3.0 and 4.6 V by coin cell testing, while the pristine 523 keeps only 146.2 mA h g−1 with 78.6% capacity retention left. The capacity retention rate increases from 50% to 86.7% after 150 cycles at 1 C in 3.0–4.35 V by soft package testing under 45 °C. Through this novel Y2O3 coating operation, both the charge transfer resistance and the electrode polarization of the 523 electrode have been suppressed, and its structure stability is also improved. 相似文献