基于大数据的警用知识处理框架的研究

当前,大数据已成为学术界、企业界乃至政府关注的焦点。将大数据应用于公安领域,将大大推动公安情报工作的发展与变革。分析了公安大数据知识处理系统的需求和关键技术,提出了警用大数据知识处理框架,为新一代协同智慧警用信息系统的构建提供了参考。     

锅炉启动过程中汽包壁温差的控制

锅炉设备在启动过程中,由于温度升高的幅值和各金属部件受热条件的差别,部件之间总是存在着相对温度差,金属厚壁结构的部件——汽包尤其如此。锅炉启动过程中经常出现汽包壁温差过大,致使汽包壁热应力过大,严重影响了汽包运行的安全性及其使用寿命。通过采取适当的措施,汽包壁温差能够控制在合理的安全范围内。     

Dietary Inclusion of Tea Catechins Changes Fatty Acid Composition of Muscle in Goats

This study was conducted to examine dietary tea catechins (TC) supplementation on the fatty acid composition of muscle and ruminal bacteria in goats fed a maize stover-based diet. Forty goats, 8 months old (16.2 ± 1.2 kg), were randomly divided into four equal groups (10 animals in each group) and assigned to four experiment diets with TC supplementation at four levels (0, 2,000, 3,000 and 4,000 mg TC/kg feed, namely TC0, TC2000, TC3000 and TC4000, respectively). After a 60-day feeding period, all the goats were slaughtered and sampled. The results showed that dietary TC inclusion increased the average daily gain (ADG), protein content in the semimembranosus muscle and dry matter in the longissimus dorsi muscle (LD). Dietary TC supplementation increased the ratio of n-6 to n-3 fatty acid, the ratio of polyunsaturated fatty acids to saturated fatty acids was higher in TC3000 and TC4000 than in TC0 and TC2000 for LD. The current results implied that dietary inclusion of a suitable TC dose could improve the growth performance and increase the proportions of unsaturated fatty acids in muscle, and the biohydrogenation of ruminal microorganisms might change the profiles of fatty acids in the muscle of growing goats.     

电厂给水泵电机振动原因分析与处理

对华美热电公司#2给水泵电机#1、#2轴瓦振动大的问题进行分析,认为其主要原因为:电机内冷却系统冷却不均匀,造成转子质量不平衡、冷态时转子高度预留系数太大,使热态时各转子抬高不在同一水平线上,轴系中心偏差太大。由于采取了相应的处理措施,轴瓦振动得到有效的解决,为同类型泵的振动处理起到了一定的借鉴作用。     

CS16100高速高精度数据采集分析系统

介绍了ＣＳ１６１００高速高精度数据采集分析系统的组成，性能指标和系统内各部件，包括数据放大器、数字化箱体、主控机以及系统软件的特点和功能。     

Microstructures and properties of ultrafine-grained pure titanium processed by equal-channel angular pressing and cold deformation

Equal-channel angular pressing (ECAP) has been used to refine the grain size of commercially pure (CP) titanium as well as other metals and alloys. CP-Ti is usually processed at about 400 degrees C because it lacks sufficient ductility at lower temperature. The warm processing temperature limits the ability of the ECAP technique to improve the strength of CP-Ti. We have employed cold deformation following warm ECAP to further improve the strength of CP-Ti. Ti billets were first processed for eight passes via ECAP route Bc, with a clockwise rotation of 90 degrees between adjacent passes. The grain size obtained by ECAP alone is about 260 nm. The billets were further processed by cold deformation (cold rolling) to increase the crystalline defects such as dislocations. The strength of pure Ti was improved from 380 to around 1000 MPa by the two-step process. This article reports the microstructures, microhardness, tensile properties, and thermal stability of these Ti billets processed by a combination of ECAP and cold deformation.     

PP/EPDM/滑石粉微孔发泡复合材料的制备和性能

通过微发泡注射成型方法制备PP/EPDM(三元乙丙橡胶)/滑石粉复合材料制品,并研究滑石粉的含量对PP/EPDM/滑石粉微孔发泡复合材料的微观形态和力学性能的影响。结果表明:添加适量滑石粉的PP/EPDM/滑石粉复合材料的发泡效果优于仅添加单一的EPDM的PP/EPDM复合材料的发泡效果,而且当PP/EPDM/滑石粉的质量比为79/21/4时,微孔制品的微观形态最好;且此比例的PP/EPDM/滑石粉微孔发泡制品与未添加滑石粉的PP/EPDM微孔发泡复合材料制品相比,其拉伸强度、弯曲强度、冲击强度分别提高了2%、6%、4%。     

基于局部关键路径与截止期限分配的云工作流调度算法

为了解决云计算中截止期限约束下的工作流调度代价优化问题,提出一种基于局部关键路径和截止期限分配的工作流任务调度算法。为了满足期限约束,并最小化执行代价,算法将工作流任务的调度过程划分为两个阶段:期限分配阶段和调度资源选择阶段。期限分配阶段定义工作流的局部关键路径,并以递归的方式在局部关键路径上的任务间进行子期限分配;调度资源选择阶段在满足任务子期限的同时,为每个任务选择执行代价最低的资源进行任务调度,以实现调度代价优化。分析算法的时间复杂度,并通过一个算例对算法的实现思路进行了详细阐述。通过科学工作流结构的仿真实验,证明了算法不仅可以满足截止期限约束,而且可以降低工作流任务的执行代价。     

Nucleation mechanism for the direct graphite-to-diamond phase transition

Graphite and diamond have comparable free energies, yet forming diamond from graphite in the absence of a catalyst requires pressures that are significantly higher than those at equilibrium coexistence. At lower temperatures, the formation of the metastable hexagonal polymorph of diamond is favoured instead of the more stable cubic diamond. These phenomena cannot be explained by the concerted mechanism suggested in previous theoretical studies. Using an ab initio quality neural-network potential, we carried out a large-scale study of the graphite-to-diamond transition assuming that it occurs through nucleation. The nucleation mechanism accounts for the observed phenomenology and reveals its microscopic origins. We demonstrate that the large lattice distortions that accompany the formation of diamond nuclei inhibit the phase transition at low pressure, and direct it towards the hexagonal diamond phase at higher pressure. The proposed nucleation mechanism should improve our understanding of structural transformations in a wide range of carbon-based materials.     

张家港枢纽立交地涵设计中止水方案的选择

1工程概况张家港枢纽是走马塘拓浚延伸工程的重要组成部分,位于走马塘与高等级航道申张线(张家港,规划Ⅲ级航道)交汇处。工程由64.8m2立交地涵、50m3/s排水泵站、总净宽24m(2×12m)节制闸、单孔净宽14m退水闸组成。立交地涵工程建筑物等级为Ⅱ等2级,地涵设计流量50m3/s,共3孔,总长约150m。地涵主要由上、下洞首、洞身、上下游连接段等部分组