A lightweight convergent personal mobile service delivery approach based on phone book

Mobile phone users are demanding an efficient convergent communication approach for efficient communication and information sharing with their real life social circles. Unfortunately, the existing telecom services and the popular Internet services are not organically integrated to provide convenient convergent services. To overcome this issue, one of the promising convergent communication services considered by telecom carriers is RCS (Rich Communication Suite). However, existing issues, such as insufficient interoperability among different operators, shortage of terminals and heavy dependence on large‐scale IP multimedia subsystem (IMS) network deployment, mean that it will take time to implement RCS across worldwide networks and for it to become a service equally universal as voice and short message. Instead of a heavyweight RCS solution, in this paper, we propose a lightweight, quick deployment mobile phone book application system based on cloud computing without a fully deployed IP multimedia subsystem infrastructure, which seamlessly integrates traditional telecommunication services, instant messaging services, social networking services and automatic contact information management. Based on this, ‘Telco‐OTT’ service provision approach, telecom carriers can allow their subscribers to enjoy conveniently the rich convergent personal service experience quickly without a large initial investment. Thus, it is a low‐risk opportunity for telecom carriers to meet subscriber demand for advanced user‐centric convergent service features. Copyright © 2013 John Wiley & Sons, Ltd.     

自适应阈值函数小波算法的电机振动信号去噪

通常采集的电机振动信号中都含有噪声成分,一般采用小波阈值去噪处理可以达到理想的效果,但是传统软、硬阈值函数存在恒定偏差或不连续等缺点,不能很好的保留有用信息。针对这一问题,文中提出了随分解层数自适应且具有调整参数的阈值函数。改进的小波阈值函数连续、可微且具有渐进性,通过遗传算法做调整参数寻优,在保留大部分原始信号的基础上进行去噪,使得新的小波去噪算法在保留有用信息与去除噪声之间有较好的平衡性。实验中将该方法应用于所采集的电机振动信号,结果显示,该方法具有更高的信噪比与较低的均方根误差,能够更好的滤除噪声,保留原信号的有用信息。     

加油机器人动力学建模与分析

以五自由度加油机器人为研究对象,采用牛顿-欧拉法建立了机器人的动力学模型并进行动力学分析.基于Matlab软件进行了动力学理论计算并绘制了力矩曲线.基于SolidWorks软件构建了机器人的三维模型并进行动力学仿真,得到各关节的力矩曲线.结果表明,各关节力矩的理论值和仿真值随时间变化的曲线相似,偏差小,动力学模型和算法合理可行.     

FeSe2‐Decorated Bi2Se3 Nanosheets Fabricated via Cation Exchange for Chelator‐Free 64Cu‐Labeling and Multimodal Image‐Guided Photothermal‐Radiation Therapy

Multifunctional theranostic agents have become rather attractive to realize image‐guided combination cancer therapy. Herein, a novel method is developed to synthesize Bi₂Se₃ nanosheets decorated with mono‐dispersed FeSe₂ nanoparticles (FeSe₂/Bi₂Se₃) for tetra‐modal image‐guided combined photothermal and radiation tumor therapy. Interestingly, upon addition of Bi(NO₃)₃, pre‐made FeSe₂ nanoparticles via cation exchange would be gradually converted into Bi₂Se₃ nanosheets, on which remaining FeSe₂ nanoparticles are decorated. The yielded FeSe₂/Bi₂Se₃ composite‐nanostructures are then modified with polyethylene glycol (PEG). Taking advantages of the high r ₂ relaxivity of FeSe₂, the X‐ray attenuation ability of Bi₂Se₃, the strong near‐infrared optical absorbance of the whole nanostructure, as well as the chelate‐free radiolabeling of ⁶⁴Cu on FeSe₂/Bi₂Se₃‐PEG, in vivo magnetic resonance/computer tomography/photoacoustic/position emission tomography multimodal imaging is carried out, revealing efficient tumor homing of FeSe₂/Bi₂Se₃‐PEG after intravenous injection. Utilizing the intrinsic physical properties of FeSe₂/Bi₂Se₃‐PEG, in vivo photothermal and radiation therapy to achieve synergistic tumor destruction is then realized, without causing obvious toxicity to the treated animals. This work presents a unique method to synthesize composite‐nanostructures with highly integrated functionalities, promising not only for nano‐biomedicine but also potentially for other different nanotechnology fields.     

运用信息技术改造传统企业实现企业管理现代化——“斯达”模式介绍

介绍了“斯达”管理模式－－用信息技术改造传统企业,全面实现现代化管理的经验。     

武夷德化-尤溪-永泰矿集区遥感解译与光谱特征分析

德化-尤溪-永泰矿集区位于武夷山成矿带南端,已发现多处与火山-次火山作用有关的热液型矿床。本次研究通过遥感影像解译来分析矿集区内断裂、火山机构等构造特征,通过遥感蚀变信息、岩矿光谱特征研究和蚀变矿物填图,提取矿集区主要蚀变矿物信息,探索蚀变矿物组合及分布特征。遥感影像解译表明,本区以NE向断裂带为主,为矿区火成岩喷溢和矿液上升提供了通道,控制着矿脉和岩脉的产出。遥感蚀变信息提取揭示,矿集区羟基和铁染蚀变具有分布规律性,主要分布在西部沿NE向断裂走向蚀变区、中部环绕雷潭－安村火山机构的蚀变区和东北部环绕和顺火山机构的蚀变区,对矿体分布具有一定的指示意义。岩矿光谱识别表明,矿集区主要蚀变矿物类型有蒙脱石、伊利石、多硅白云母、绿泥石、硬石膏等。在此基础上,进一步构建了邱村金矿蚀变分带模型,伊利石+多硅白云母的蚀变组合位于主矿体附近,而蒙脱石+硬石膏的蚀变组合则位于主矿体边缘,对于区域找矿方向具有指示意义。     

Fundamentals of electrochemistry (Ⅳ) --Electrode kinetics

电极过程动力学对电化学过程起着支配作用,研究成果广泛用于化学工业,能源领域,材料科学和环境保护等领域.电极过程主要由扩散传质,传荷过程以及表面吸附/脱附步骤构成.电活性物质从溶液主体到电极表面的传质过程包括对流,扩散和电迁移三种基本形式.电流-电势关系是表征电极反应动力学的基本途径,并在特定的电极条件下,可以推导得出Tafel半对数极化曲线公式和Butler-Volmer电极动力学公式.广义的表面转化过程包含了前置的表面转化步骤和后置的表面转化步骤.此外,利用流体力学计算能够反映电极表面流体流动对旋转圆盘电极过程的传质影响.通过对上述基本概念的总结与归纳,能够加深对电化学核心内容的把握,有利于研究开发新型应用电化学技术.     

Fundamentals of electrochemistry(Ⅴ)--Electrochemical kinetic and charge-transfer process for electrochemical reaction

电荷传递过程是电化学反应的本质.了解电荷传递过程有助于揭示电化学反应的内在规律,实现电化学工业过程控制和电化学反应设计.本文通过回顾电极过程动力学理论的发展历程及数学表达式的演化过程,阐述电化学反应中电荷传递过程的科学背景,理解其中的科学思想,相信对于促进现代电化学研究的发展具有启示意义.     

形状因子对微观定向结构Cu-W复合材料触头的力学和电学性能的影响

设计了三种微观定向结构的Cu-W复合电触头材料,用差异显著的形状因子对其表征,研究了形状因子对其导电性能和力学性能的影响。基于有效介质方程(GEM)和导电通道理论并结合仿真计算,得到不同骨架结构复合材料的电流密度分布及其与形状因子的关系。结果表明,形状因子F越接近1导电通道越容易形成团簇,导电性能越好;基于Mises屈服准则计算力学性能,仿真分析了不同结构复合材料的形变特性,提出其力学性能与形状因子的关系,即随着形状因子圆形度的增大力传导微元的稳定性随之提高;形状因子的圆形度越大,力传导微元越不易发生变形,机械性能越好。根据Cu-W复合电触头材料的导电性能和力学特性,可进一步优化其综合性能。