Analysis on the performance of cell-free massive MIMO system with network-assisted full duplexing [PDF]
As the Internet of things evolves towards low-power consumption and high speed, full duplex cell-free massive multiple input multiple output (CF-mMIMO) networks have gained significant attention, because of the potential for huge channel capacities.
LI Kundi +4 more
core +1 more source
Research for Theory and Method of Measuring Microwave Ceramic Material and Ceramic Capacitor [PDF]
, 2006 微波介质陶瓷现已广泛应用于微波技术的许多领域，特别是移动通信系统中。对其介电性能的测定已引起人们越来越多的关注。在此基础上，使用陶瓷材料作为介质的多层陶瓷贴片电容也已大量地用于射频和微波电路中，因此对其电路参数的准确测量也显得日益重要。本文根据863项目“新型微波介质陶瓷材料与元件的研制”的需要，围绕着陶瓷材料与陶瓷电容的测量理论和方法进行研究，所作的主要工作可概括如下1.提出一种新的求解任意谐振腔内被测介质复电磁参数的理论方法——本征值法。先把该方法应用于各种平行板内介质谐振器复介电常数的计算 ...
骆超艺
core
Coordinated Optimization of Intelligent Soft Open Points and Multiple Types of Shared Energy Storage in Distribution Networks Considering Flexibility Deficiency Risk [PDF]
ObjectivesTo address the operational security issues in the new-type distribution network caused by the high-penetration integration of renewable energy, this paper proposes a coordinated optimization method for intelligent soft open points and multiple ...
FAN Xiaochao +5 more
core +1 more source
A Meibomian Gland Massage Mechanism for Upper and Lower Eyelids Based on Anti-phase Rolling and Enveloping Movement [PDF]
, 2014 在睑板腺功能障碍的治疗过程中,睑板腺按摩是一种有效的辅助治疗手段。该文针对传统的机械辅助按摩结构中的缺陷进行了改进,提出了一种基于反相按摩辊滚压和包络原理的按摩机构,以提高阻塞物排出顺畅度和提高按摩区域覆盖率,最终达到提高辅助治疗效果的目的。同时,针对机构中电机受尺寸影响较大的情况,对运转过程中输入动力与输出载荷和损耗进行了评估计算,初步验证了所设计机构的可行性。During the course of meibomian gland dysfunction(MGD) treatment ...
周圆 +5 more
core
Research on intelligent conveying technology of 500 m ultra-long face scraper [PDF]
In the field of medium and thick coal seam mining, intelligent mining of ultra-long face is the development trend of coal mining technology, and intelligent transportation is an important part of it.Based on the summary of the problems of the scraper ...
Hongzhang XIE +3 more
core +1 more source
Preparation and Properties of (Zr0.8Sn0.2)TiO4 Microwave Dielectric Ceramics by Wet Chemical Method [PDF]
, 2006 摘要本论文选取(Zr0.8Sn0.2)TiO4(简称ZST)介质陶瓷作为研究对象，采用共沉淀法和水热法等液相法来合成ZST陶瓷材料。在共沉淀法制备ZST陶瓷中，分散剂PEG6000的加入能有效改善粉体的团聚；制备的粉体可在1480℃烧结成瓷，添加1wt%的ZnO后能降低陶瓷的烧结温度，但陶瓷的介电性能变差；添加Zn(NO3)2·6H2O或复合添加ZnO/Nb2O5均能得到介电性能优良的陶瓷(er=36～40，Q×f>50000GHz，τf=-10～10ppm/℃)。采用水热法合成陶瓷粉体 ...
鲍德艳
core
Gaoya dianqi, 2017 针对变压器的直流偏磁问题,分析了特高压变压器直流偏磁时无功损耗的响应机理,给出无功损耗计算方法,进行无功损耗特性分析。采用增加串联电阻的方法,提高计算电流中直流分量的计算精度。结合电压补偿,消除增加串联电阻后导致的电压下降问题。根据特高压变压器的实际参数,建立变压器的场路耦合模型,进行特高压变压器不同直流偏磁电流下的仿真计算。研究表明,变压器直流偏磁时,励磁电流波形严重畸变。随着直流偏磁电流的增加,特高压变压器的空载无功功率逐渐增加,直流偏磁电流超过一定范围后 ...
王泽忠, 谭瑞娟, 刘连光, 邓涛
doaj
Research on Current Control Strategy of the LCL-Type Grid-Connected Inverter Based on State Reconfiguration With Quasi Resonant-Extended State Observer [PDF]
The LCL-type grid-connected inverter (GCI) is a critical device for realizing energy transmission between distributed generation and the power grid. The current control of the GCI typically requires multiple sensors to enable active damping and grid-side
FANG Jian, LI Hui
core +1 more source
Guangtongxin yanjiu, 2017 为解决行波光电探测器阵列在高功率要求下集成过多的光电二极管导致结构变复杂、响应速度下降的问题,提出了一种基于二极管组的行波光电探测器阵列结构。从功率合成、频率响应和回波损耗等方面对新旧两种结构进行了分析。在应用相同数量二极管的条件下,改进型行波光电探测器阵列采用更少的电感元件且输出功率不变,工作带宽不变,回波损耗有较大改善。研究结果表明,这种改进型行波光电探测器阵列结构能够更好地满足功率要求。
柯昂, 文化锋, 徐敏松, 何云
doaj
Performance of different DCSK schemes over the UWB in- body channel [PDF]
, 2016 混沌调制(differential chaos shift keying,DCSK)技术应用于超宽带(ultra wideband,UWB)短距离传输系统具有潜在的优势。提出了分别基于多元DCSK(M-ary DCSK,M-DCSK)、调频DCSK(frequency modulation-DCSK,FM-DCSK)和QCS-DCSK(quadrature code shifted-DCSK)的超宽带无线体内传输系统,分析了提出的基于最新几种混沌调制的超宽带体内传输系统的BER(bit error ...
吕毅博, 曹学鹏, 王琳, 黄婷婷
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