以太网串口服务模块的光端机监控系统设计

设计了以太网串口服务模块,移植了TCP/IP协议,具有一个IP地址、多个端口号.系统具有多个套接字地址,每个套接字地址分配给一台终端设备,客户端通过套接字地址寻址终端设备,实现了客户端对设备的一对一的管理.该模块同时支持多连接,将其安装在局端光端机内,引出监控网口连接到以太网交换机土,能够分布式管理系统中的各个终端设备.     

Tuning the Electrolyte Solvation Structure to Suppress Cathode Dissolution,Water Reactivity,and Zn Dendrite Growth in Zinc-Ion Batteries

The cycle life of aqueous zinc-ion batteries (ZIBs) is limited by the notable challenges of cathode dissolution, water reactivity, and zinc dendrites. Here, it is demonstrated that by tuning the electrolyte solvation structure, the issues for both the electrodes and the electrolyte can be addressed simultaneously. Specifically, a fire-retardant triethyl phosphate (TEP) is demonstrated as a cosolvent with strong solvating ability in a nonaqueous/aqueous hybrid electrolyte. The TEP features a higher donor number (26 kcal mol⁻¹) than H₂O (18 kcal mol⁻¹), preferring to form a TEP occupied inner solvation sheath around Zn²⁺ and strong hydrogen bonding with H₂O. The TEP coordinated electrolyte structure can inhibit the reactivity of H₂O with V₂O₅ and leads to a robust polymeric-inorganic interphase (poly-ZnP₂O₆ and ZnF₂) on zinc anode effectively preventing the dendrite growth and parasitic water reaction. With such an optimized electrolyte, the Zn/Cu cells perform high average Coulombic efficiency of 99.5%, and the full cell with a low capacity ratio of Zn:V₂O₅ (2:1) and lean electrolyte (11.5 g Ah⁻¹) delivers a reversible capacity of 250 mAh g⁻¹ for over 1000 cycles at 5 A g⁻¹. This study highlights the promise of a successful electrolyte regulation strategy for the development of high-performance and practical ZIBs.     

可穿戴设备中基于人体通信的身份识别方法研究*

针对目前生物识别技术在穿戴式设备上应用的缺陷,提出一种可应用于可穿戴设备上的生物识别方法。利用300KHz-1.5GHz的电磁波在人体通信信道传输中产生的幅度衰减特性曲线作为生物特征。为了验证此方法的可行性,首先,利用矢量网络分析仪测量生物特征;其次,提取数据的梯度,使用支持向量机进行分类器模型训练和测试。验证结果与直接对采集的生物特征进行分析的方法对比,引入梯度的分析方法使得正确识别率从90.45%提高到94.54%、等错误率从0.95%降低到0.14%、接收者操作特征曲线下面积从0.9971增加到0.9999。因此,基于人体通信的身份识别方法可为穿戴式设备的身份认证系统研究提供一种方法。     

A design for a common‐sense knowledge‐enhanced decision‐support system: Integration of high‐frequency market data and real‐time news

According to efficient markets theory, information is an important factor that affects market performance and serves as a source of first‐hand evidence in decision making, in particular with the rapid rise of Internet technologies in recent years. However, a lack of knowledge and inference ability prevents current decision support systems from processing the wide range of available information. In this paper, we propose a common‐sense knowledge‐supported news model. Compared with previous work, our model is the first to incorporate broad common‐sense knowledge into a decision support system, thereby improving the news analysis process through the application of a graphic random‐walk framework. Prototype and experiments based on Hong Kong stock market data have demonstrated that common‐sense knowledge is an important factor in building financial decision models that incorporate news information.     

Self-sensing actuation for improved audio-induced vibration rejection in dual-stage hard disk drives

Microsystem Technologies - In this paper, a general circuit topology of enhanced indirect-driven self-sensing actuation (EIDSSA) is proposed to allow independent design of actuation and...     

Properties of cellulose/PAN blend membrane

The water flux of a cellulose/PAN blend membrane increased with the PAN content, while retention to glucosan T40 decreased. The water flux decreased and the retention increased with the whole solid content. The membrane obtained had a high ability to remove creatinine and urea. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 3105–3111, 2002; DOI 10.1002/app.10021     

助剂对聚乙烯防雾滴膜性能的影响

采用熔融共混法制备母料,然后将母料与基体树脂(聚乙烯)按一定比例混合,于吹塑机上吹塑成膜。研究了流滴缓释剂、减雾剂、防老剂及母料中防雾滴剂含量对薄膜防雾滴性能的影响。     

Phase diagrams of polyethylene blends by Raman spectroscopy

Summary The Raman internal mode region analysis of polyethylene (PE) is extended to studies of blends of different PEs so as to obtain a phase diagram showing the magnitude of crystalline (P_c), amorphous (P_a) and interfacial (P_b) phases at different compositions. The non-cocrystallizable HDPE/LDPE blends shows additivity in phase structure with blend composition. Enlarged share of P_b is seen for compatible blends of HDPE/LLDPE and especially for HDPE with VLDPE of low crystallinity. This method offers an easy access to direct observing compatibility of different PEs on a molecular level. Supported by Chinese Petrochemical Corporation (SINOPEC)     

Studies on the blends of CO2 copolymer. IV. Natural rubber/poly(propylene carbonate) systems

The blends of a carbon dioxide copolymer, poly(propylene carbonate)(PPC) with natural rubber (NR), were prepared and their mechanical properties and morphology were studied. The optimum formulation blend was obtained by orthogonal experiments. The tensile strength of the blend containing 30 phr PPC was 18.9 MPa, with an elongation at break of 755%. The factors such as PPC and dicumyl peroxide content, PPC molecular weight, sulfur content, curing time, and curing temperature responsible for controlling the mechanical properties were discussed. Transverse electron micrographs showed a two‐phase structure for this blend. Gel content data revealed that PPC was crosslinked. The phase stability of PPC in the blend improved because of the interpenetrating new work structure. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2140–2144, 2002     

用于直驱式机电作动器的PMSM自抗扰控制研究

基于永磁同步电机(PMSM)的直驱式机电作动器,要求电机位置控制精度高、鲁棒性强,且具有极高的抗负载冲击能力.针对以上需求,设计了实用的PMSM自抗扰控制器.首先,采用线性控制率实现误差反馈控制,并应用扩张状态观测器(ESO)估计交、直轴电流交叉耦合及电量参数摄动所引起的扰动以进行前馈补偿,实现id=0的矢量控制及交轴电流随动控制;然后,应用跟踪微分器安排位置响应的过渡过程,用ESO估计出系统状态及负载和摩擦转矩引入的总扰动,分别用于实现非线性状态反馈控制及扰动补偿,完成以交轴电流为内环的位置伺服控制.仿真及实验结果表明,PMsM自抗扰控制系统精度高,响应快速无超调,刚度大,算法本身计算量小,且易于工程实现,具备可行性.