摘要：提出一种基于T型有源滤波器(APF)的三相整流器拓扑结构,给出了系统主电路参数设计方法,建立了T型APF的数学模型,设计了两种控制策略并进行了比较研究,即仅采用系统电流反馈控制策略和系统电流反馈控制与负载电流前馈控制相结合的控制策略。采用PSCAD/EMTDC对两种控制策略进行了仿真分析,并进行了实验验证。仿真和实验结果的一致性表明,本文提出的拓扑结构是可行的,提出的控制策略是有效的。

摘要：Malaysia is a multicultural, multireligious, and multiethnic country that is located in Southeast Asia. The social background of Malaysia as a multicultural state calls for the adoption of an alternative method to resolve community dispute which would offer solution and simultaneously promote harmonization in the society. Community mediation may be one of such alternative, if not the best method for interethnic relations. The government of Malaysia has introduced community mediation in Malaysia by providing training for community mediators through a pilot program, known as Rukun Tetangga （Peaceful Neighbor）. The purpose of this program is to promote unity among the multi-races and multiethnic citizens. This paper will refer to the current practice of community mediation in Malaysia as provided by the National Unity Department in Peninsula Malaysia and the practice of community mediation in Singapore. It is hoped that by comparing the practices in both countries, suggestions and recommendations could be made to improve the practice of community mediation in Malaysia.

摘要：This study provides details of the energy management architecture used in the Goldwind microgrid test bed. A complete mathematical model, including all constraints and objectives, for microgrid operational management is first described using a modified prediction interval scheme. Forecasting results are then achieved every 10 min using the modified fuzzy prediction interval model, which is trained by particle swarm optimization.A scenario set is also generated using an unserved power profile and coverage grades of forecasting to compare the feasibility of the proposed method with that of the deterministic approach. The worst case operating points are achieved by the scenario with the maximum transaction cost. In summary, selection of the maximum transaction operating point from all the scenarios provides a cushion against uncertainties in renewable generation and load demand.

摘要：列举了检验机构对自动扶梯防逆转保护功能的几种检测方法；分析了现有的自动扶梯防逆转保护监测的几种形武．指出了这些形式存在的不足；提出了用于防逆转保护的一种新的速度监控相位法——双传感器安装于梯级棱对面监测法，分析了该方法的设计原则，并进行了试验测量。

摘要：通信系统是多模块变换器系统(MMCS)中非常重要的部分。传统的MMCS多采用模拟线路传递信号。灵活性低,可控性差,隔离要求高。提出一种基于数字信号总线的环形通信架构,该架构可很好地应用于MMCS,不仅可降低模块间通信隔离的等级,更增强了整个MMCS的可扩展性。详细分析了环形通信架构的工作原理及其应用于MMCS的优势所在,并以输入串联输出并联(ISOP)直流变换器的设计为例,展示了环形通信架构在MMCS设计中的具体实现,并给出了应用数字总线的MMCS的一般性设计步骤。一个采用环形通信架构的四模块ISOP DC/DC变换器原型机已搭建并测试完成,证明了环形通信架构在MMCS中应用的可行性。

摘要：随着网络技术的飞速发展,社会对于网络应用的质量要求也越来越高,而并发能力作为网络应用的基本能力之一,在很大程度上影响了用户的使用体验。针对基于多线程的并发成为限制并发能力提升的瓶颈,基于多线程的应用在高并发场景中会浪费大量系统资源等问题,文章设计并实现了一个基于事件的异步请求响应方案。该方案使用基于事件的并发方法,对用户的请求可以进行无阻塞的响应,同时可以有效降低系统的内存消耗,并根据后端响应服务的特性将后端服务器群划分为负载均衡模块和Web响应集群模块,然后将这些模块整合成一套高并发Web响应系统,该系统能够实现Linux平台的高并发响应。文章最后对此原型系统进行了实验,实验结果表明,系统在并发能力、可靠性、稳定性方面均有较好的表现,能够利用系统完成万级并发的稳定响应任务,具有较高的实际应用价值。

摘要：This report presents a design system based on the use of CsI(TI) detectors to search for lost radioactive sources that are dangerous and harmful to individuals, including searching persons. For this purpose, the GEANT4 simulation toolkit was utilized to develop a system based on three detectors. Various simulated analyses were performed on the dose rates of the three detectors using different source–detector distances and detector separation. There were good agreement between the simulated results and the experimentally measured data. A new method was discussed to detect and search for radioactive sources based only on the dose rates in detectors with source activity. Numerical analyses were performed based on the measured dose rates and the difference of distances to determine the actual location of the lost single or multiple γ-ray sources at a specific angle. The detection limit was calculated from the background radiation to establish the sensitivity and capability of the proposed detector system. This system can be applied in fields in which it is necessary to locate unknown radioactive sources.

摘要：叶绿素含量是田间诊断氮素营养供应状况指标之一,与氮代谢密切相关。【目的】为探讨播期和密度对迟直播棉花主茎不同叶位氮代谢与产量的影响。【方法】采用裂区试验设计,以播期(月-日)(S1,05-30;S2,06-14)为主区,密度(株·m-2)为副区(D1,7.5;D2,9.0;D3,10.5),在大田试验条件下研究了不同生育时期棉花主茎不同叶位叶绿素含量的动态变化。【结果】1)棉花叶绿素a、b、(a+b)含量盛花期>初花期>现蕾期,且随叶位由上而下先升高(倒3~5叶最高)后降低,随密度增加而降低,播期间(现蕾期、初花期、盛花期)S2显著高于S1(现蕾期叶绿素b无显著差异),播期、密度均不改变这些指标在叶位间的变化趋势,播期与密度交互作用存在差异(应作相应的统计分析);2)棉花叶绿素a/b现蕾期>初花期(盛花期),不同叶位间现蕾期随叶位由上而下先升高(倒3~4叶最高)后降低,但初花期和盛花期变化平缓,播期、密度不影响叶位间的变化趋势;3)通过逐步回归分析法,得到单叶叶绿素含量(叶绿素(a+b)、叶绿素a、叶绿素b、叶绿素a/b)能够显著代表整株平均水平的叶位,即为棉花叶绿素含量典型叶,现蕾期为倒5叶,初花期为倒4叶,而盛花期随叶绿素指标不同而异。【结论】S1D2产量最高,叶绿素含量、a/b值比较合理。

摘要：The exchange bias is of technological significance in magnetic recording and spintronic *** a large bias field is a long-term goal for the research field of magnetic shape memory *** this work,a large bias field of 0.53 T is achieved in the Ni50Mn34In16-xFex(x=1,3,5)system by tuning the magnetic ground state(determined by the composition x)and the magnetic-field history(determined by the magnetic field HFCduring field cooling and the maximum field HMaxduring isothermal magnetization).The maximum volume fraction of the interfaces between the ferromagnetic clusters and antiferromagnetic matrix and the strong interfacial interaction are achieved by tuning the magnetic ground state and the magnetic-field history,which results in strong magnetic unidirectional anisotropy and the large exchange ***,two guidelines were proposed to obtain the large bias ***,the composition with a magnetic ground state consisting of the dilute spin glass and the strong antiferromagnetic matrix is preferred to obtain a large bias field;secondly,tuning the magnetic-field history by enhancing HFCand reducing HMaxis beneficial to achieving large exchange *** work provides an effective way for designing magnetically inhomogeneous compounds with large exchange bias.

摘要：Bone is an essential organ for health and quality of *** to current shortfalls in therapy for bone tissue engineering,scientists have sought the application of synthetic materials as bone graft *** a composite organic/inorganic material with significant extra cellular matrix(ECM),one way to improve bone graft substitutes may be to engineer a synthetic matrix that is influenced by the physical appearance of natural ECM *** this work,the authors evaluate composite,hybrid scaffolds for bone tissue engineering based on composite ceramic/polymer microsphere scaffolds with synthetic ECM-mimetic networks in their pore *** thermally induced phase separation,nanoscale fibers were deposited in the pore spaces of structurally sound microsphere-based scaffold with a density proportionate to the initial polymer *** and mechanical testing indicated no significant changes in overall pore characteristics or mechanical integrity as a result of the fiber deposition *** scaffolds displayed adequate mechanical integrity on the scale of human trabecular bone and supported the adhesion and proliferation of cultured mouse calvarial *** from natural cues,these scaffolds may represent a new avenue forward for advanced bone tissue engineering scaffolds.