激光增材制造技术专利概况

对激光增材制造技术的政策背景、技术发展现状及其专利概况进行了研究,从技术的构成、技术特点以及专利技术方面进行了调查,并重点在专利技术领域分类、专利申请趋势、申请国别、国外和国内重要申请人和发明人、专利侵权国别分布、专利诉讼主要申请人等方面进行了专利分析,明晰了我国激光增材制造的全球定位,找准薄弱环节,为国内相关产业链提供了有力的支持和决策建议。     

激光增材制造研究前沿与发展趋势

从激光增材制造材料、工艺、装备、应用等方面分析了激光增材制造技术当前的研究热点以及相关的研究进展,梳理了未来主要发展方向.材料和成型工艺方面的相关研究主要集中于轻质合金和高价值合金增材制造;从成型装备来看,设备大型化、高速化、复合加工是未来的主要发展方向;而应用方面则主要面向高性能、高价值零部件的增材制造与生物植入体....     

基于增材制造技术的光纤布拉格光栅土压力传感器

基于增材制造(AM)技术和光纤布拉格光栅(FBG)制备了一种土压力传感器.标定实验结果表明,FBG土压力传感器的灵敏度为0.2 pm/kPa,最小分辨率为5 kPa,量程为1000 kPa;且该传感器的灵敏度可根据需求用AM参数(填充密度、填充材料)进行调整,从而减小测量误差.室内模型箱的实验结果表明,该传感器能有效测...     

基于光纤布拉格光栅和增材制造技术的测斜传感器

增材制造技术可以制备高灵活度的测斜传感器,即传感器的灵敏度、分辨率、量程均可以根据需求进行设计与制作,因此,基于光纤布拉格光栅和增材制造技术研发了一种新型测斜传感器.为了验证该传感器的性能,推导了该传感器的测量原理并开展了标定实验和边坡模型加载实验.实验结果表明,该传感器的测斜灵敏度为0.0824(°)/pm,分辨率为...     

点阵结构热交换器激光增材制造及换热性能测定

采用激光粉末床熔化成形增材制造技术制备了具有点阵结构的316L不锈钢、TC4钛合金和铜合金三种不同材料的热交换器。采用微纳计算机断层扫描(CT)技术对制备成形后的点阵结构热交换器进行三维图形的重构,获得热交换面积的数值;测量了激光粉末床熔化成形的点阵结构热交换芯体的尺寸及表面粗糙度;使用由加热单元、流动水和热电偶组成的试验装置(水流量为0.5 L/min,入水口温度恒定为22℃,环境温度为25℃,加热单元的加热功率维持在400 W),对热交换器的换热性能进行了测定。测试结果如下：三种材料的热交换芯体尺寸均达到了150 mm×150 mm,尺寸精度控制在±0.1 mm,表面粗糙度(R_a)小于10μm,热交换效率>1000 m²/m³。相比传统的具有相同芯体尺寸的热交换效率为875 m²/m³的板翅式热交换结构,三种材料的点阵热交换结构(具有相同点阵结构、尺寸、结构表面积和结构表观体积,未考虑材料的热物性参数)在热交换效率提高10%的情况下,体积减小了24.9%,质量减少了6...     

Latest Developments and Problems in Standardization of Resource Control Technologies for NGN

As a hot spot of next generation network, research over resource control has been carried out for years both in China and abroad. With a gradual progress in standardization, this field presents new development trends and features. Based on latest progresses in standardization promoted by ITU-T, TISPAN and 3GPP, new technologies concerned with resource control are introduced. Considering the problems faced in standardization deployment, relevant resource control functions are also analyzed in this article.     

Additive Manufacturing of Batteries

Additive manufacturing, i.e., 3D printing, is being increasingly utilized to fabricate a variety of complex‐shaped electronics and energy devices (e.g., batteries, supercapacitors, and solar cells) due to its excellent process flexibility, good geometry controllability, as well as cost and material waste reduction. In this review, the recent advances in 3D printing of emerging batteries are emphasized and discussed. The recent progress in fabricating 3D‐printed batteries through the major 3D‐printing methods, including lithography‐based 3D printing, template‐assisted electrodeposition‐based 3D printing, inkjet printing, direct ink writing, fused deposition modeling, and aerosol jet printing, are first summarized. Then, the significant achievements made in the development and printing of battery electrodes and electrolytes are highlighted. Finally, major challenges are discussed and potential research frontiers in developing 3D‐printed batteries are proposed. It is expected that with the continuous development of printing techniques and materials, 3D‐printed batteries with long‐term durability, favorable safety as well as high energy and power density will eventually be widely used in many fields.     

IPTV的关键技术及发展现状

随着互联网宽带业务的不断发展,IPTV这一新的服务模式正在成为现实。本文主要介绍IPTV技术原理和关键技术,并对国内目前IPTV的发展状况进行分析。     

EPON的标准化与关键技术

本简要介绍IEEE802．3 EFM正在研究的EPON技术。以及EPON作为一种宽带接入技术的优势、EPON的基本工作原理和实现EPON关键的技术问题。     

片上雷达技术研究进展及发展趋势

本文回顾和梳理了当前片上雷达(Radar on Chip, RoC)的架构和射频前端、天线及信号处理等芯片化研究进展,以及基于异质异构集成、3D先进封装技术的雷达系统集成实现方案。在此基础上,从物理形态、实现工艺及技术发展等方面对片上雷达未来发展趋势进行了分析,指出基于硅基半导体工艺,片上集成多路雷达收发前端、波形产生及信号处理等雷达功能单元,实现片上系统（System on Chip, SoC）;或者通过异质异构及先进封装技术,将高度集成的雷达芯片集成在一个封装内,实现封装系统（System in Package, SiP）,从而满足雷达系统微型化、轻重量、低成本和低功耗的发展需求。同时,基于芯片化可扩充多通道阵列模块也有望构建大型复杂阵列雷达系统。该方案为未来小型化武器装备提供有效的探测感知手段,也为蓬勃发展的民用雷达提供可行的技术路径。     

Additive Manufacturing of Porous Biominerals

Nature fabricates hard functional materials from soft organic scaffolds that are mineralized. To enable an energy-efficient locomotion of these creatures while maintaining their structural stability, nature often renders parts of these minerals porous. Unfortunately, methods to produce synthetic minerals with a similar degree of control over their multi length scale porous structure remain elusive. This level of control, however, would be required to design lightweight yet robust biominerals. Here, a room temperature process is presented that combines a localized mineralization with emulsion-based 3D printing to form cm sized biominerals possessing pores whose diameters range from the 100 s of nm up to the mm length scale. The samples encompass up to 80 wt% of CaCO₃ and display a specific compressive strength that is significantly higher than that of previously reported 3D printed porous biominerals and close to those of trabecular bones. The universality of this approach by forming different types of bioactive minerals, including calcite, aragonite, and brushite is demonstrated. The ability to 3D print these materials under benign conditions renders this energy-efficient process well-suited to construct cm-sized lightweight yet load-bearing structures that might find applications, for example, in the design of the next generation of flying or motile objects.     

IMS新技术及进展

1概述3GPP-IMS当前的进展情况和热点讨论中的问题主要有:IMS phase2、网络融合和IMS commonalityand interoperability、IP flow based bearer charging evo-lution和QoS。1.13GPP IMS phase2进展情况标准主要包含以下内容,如表1:●进展情况如下:R6IMSPhase2内容。Stages(122.2     

自组织网络技术及标准进展

对自组织网络(SON)在3GPPSA5的标准化进展进行了介绍,分析了目前SON标准化工作中的热点问题及研究进展,展望了SON的发展趋势。     

云计算关键技术及标准化

分析了云计算关键的技术,包括虚拟化/分布式文件系统/分布式数据库等,介绍了相关云方案实现,并对云计算在IETF/ITU等标准组织的最新研究竞争做了说明。     

OTN多业务承载技术和标准进展

文章主要介绍了光传送网（OTN）多业务承载技术和标准的进展情况,包括中国标准化协会（CCSA）和ITU-T等标准组织在OTN多业务承载、ODUflex、带宽无损调整（HAO）和P-OTN等方面的相关标准化工作。