中间相沥青基介孔炭的表征及其用作锂离子电池负极材料的电化学性能

以中间相沥青为碳源、CaCO_3为模板,制备中间相沥青基介孔炭(MPMC)。采用XRD、SEM、TEM等手段表征所制介孔炭的结构和形貌,并将其用作锂离子电池的负极材料,测试电化学性能。结果表明,所制MPMC具有丰富的介孔结构和较大的比表面积及孔体积,随着CaCO_3质量分数的增加,MPMC的比表面积和孔体积先增加后减小,当CaCO_3的质量分数为70%时,所制MPMC的比表面积和孔体积最大;MPMC用作锂离子电池负极材料具有良好的电化学性能,能有效提高锂离子电池的可逆比容量,具有良好的循环稳定性和倍率性能。     

Nanoindentation response analysis of TiN-Cu coating deposited by magnetron sputtering

To investigate the change of the mechanical properties of soft metals doped PVD(Physical Vapor Deposition)coatings after the migration of soft metal to the surface, TiN-Cu coating was deposited on Si(100) by magnetron sputtering. The microstructure and mechanical properties at room temperature and after vacuum heat treatment at 300 ℃ were investigated. The results showed that the grains were clustered and the microstructure was porous for TiN-Cu coating at room temperature, while many micro-and nano-sized Cu particles were observed on the surface after vacuum heat treatment at 300 ℃. The elastic properties of the TiN-Cu coating after vacuum heat treatment at 300℃ degraded compared with that at room temperature. The hardness and elasticity modulus of TiN-Cu coating kept constant(3.7 GPa and 125.0 GPa, respectively) with the increase of nano-indentation depth, while the hardness and elasticity modulus of TiN-Cu coating after vacuum heat treatment at 300 ℃ increased gradually.     

永磁同步电机直接转矩控制新型占空比调制策略

针对传统永磁同步电机直接转矩控制系统转矩脉动和磁链脉动较大,现有占空比调制策略计算复杂等问题,提出一种新型占空比调制策略.该调制策略利用定子磁链和扇区电压矢量的作用角区分转矩脉动和磁链脉动在控制系统中的权重系数,并设计新型开关表,保证在任一控制周期中最佳电压矢量的选择.在保证系统计算量较低的前提下,利用权重系数和最佳电压矢量推导最优占空比计算公式.仿真和实验结果证明,所提出的新型占空比调制策略可以大幅度抑制转矩脉动和磁链脉动,获得较好的稳态运行性能,并保持系统快速动态响应性能.     

Echo-state-network classification based multi-services awareness in high-speed optical passive networks

With the challenge of great growing of services diversity,service-oriented supporting ability is required by current high-speed passive optical network (PON).Aimed at enhancing the quality of service (QoS) brought by diversified-services,this study proposes an echo state network (ESN) based multi-service awareness mechanism in 10-Gigabite ethernet passive optical network (10G-EPON).In the proposed approach,distributed architecture is adopted to realize this ESN based multi-service awareness.According to the network architecture of 10G-EPON,where a main ESN is running in OLT and a number of ESN agents works in ONUs.The main-ESN plays the main function of service-awareness from the total view of various kinds of services in 10G-EPON system,by full ESN training.Then,the reservoir information of well-trained ESN in OLT will be broadcasted to all ONUs and those ESN agents working in ONUs are allowed to conduct independent service-awareness function.Thus,resources allocation and transport policy are both determined only in ONUs.Simulation results show that the proposed mechanism is able to better support the ability of multiple services.     

略论江西红色文化与高校学生党建工作

江西红色文化是中国共产党领导新民主主义革命在江西区域留下的丰硕成果,在物质和非物质两个层面展示出中华文明璀灿的光辉。高校是培养建成社会主义全面小康社会人才和接班人的重要阵地,学生党建工作更是事关实现中华民族伟大复兴。本文比较全面和深刻地分析了江西红色文化的载体、内涵和特征,就新时期高校学生党建工作面临挑战条件下,如何运用这一宝贵文化资源,创新学生党建的质量和水平,提出了理念思路和方式方法。     

杂谈新媒体视觉下“微教育”的推广

以新媒体视觉为切入点,以微教育风暴为契合点,以微教育平台为着眼点,借助时尚元素为社区教育添彩,搭乘网络快车为教育工作提速,是当前社区教育直面的时代课题。     

带漂移布朗运动的一个局部时的Laplace变换

在Borodin和Salminen(2002)文献中有关带漂移布朗运动占位时的Laplace变换结果的基础上,运用Li等(2014)计算局部时的方法,推出了带漂移布朗运动在独立指数时间e_q前,及停留在0处的局部时的Laplace变换表达式Ee~(-λl(e_q,0))=lima→0I(λ/a;0,a,e_q)=((2q+μ~2)~(1/2))/(λ+(2q+μ~2)~(1/2))。当μ=0时,本文结果与标准布朗运动的结果吻合。     

达州革命老区红色旅游对农村体育的影响研究

根据革命老区的特点,结合达州当前农村体育和红色旅游在发展过程中的重要成效、主要不足及制约因素,通过探究达州农村体育与红色旅游协同发展的可行性,提出红色旅游与农村体育相辅相成、互动发展的思路,从而更好地促进革命老区达州红色旅游与农村体育的良性、和谐、共同发展.     

Cost and Service-Level-Based Model for a Seru Production System Formation Problem with Uncertain Demand

With increasing demand diversification and short product lifecycles, industries now encounter challenges of demand uncertainty. The Japanese seru production system has received increased attention owing to its high efficiency and flexibility. In this paper, the problem of seru production system formation under uncertain demand is researched. A multi-objective optimization model for a seru production system formation problem is developed to minimize the cost and maximize the service level of the system. The purpose of this paper is to formulate a robust production system that can respond efficiently to the stochastic demand. Sample average approximation (SAA) is used to approximate the expected objective of the stochastic programming. The non-dominated sorting genetic algorithm II (NSGA-II) is improved to solve the multi-objective optimization model. Numerical experiments are conducted to test the tradeoff between cost and service level, and how the performance of the seru production system varies with the number of product types, mean and deviation of product volume, and skill-level-based cost.