Results 41 to 50 of about 6,151 (176)
connection optimization of joint source and channel coding based on protograph LDPC codes [PDF]
, 2016 香农的经典分离定理已证明，信源和信道编码分别达到最优时，整个系统的性能仍能保持最优。然而分离系统适用于码长无限长的点对点传输系统，并不适用于实际的传输系统中，联合信源信道编译码系统因为其良好的传输性能和低功耗的特点吸引了更多的关注。 目前存在很多联合信源信道编译码系统的设计方案，其中低密度奇偶校验码（LDPC码）由于其良好的逼近香农限的特点且较低的译码复杂度，被引入到信源和信道的编译码联合系统（JSCC）中，称之为D-LDPC的JSCC系统，为了更好的改进联合系统的性能和降低译码复杂度 ...
曹沙沙
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Nanocomposite permanent magnets with reduced rare‐earth content represent a promising class of materials for next‐generation high‐performance applications. However, asynchronous precipitation of soft and hard magnetic phases often results in grain size mismatch and limited coercivity.
Xiaowei Zhang +6 more
wiley +1 more source
Study on Remote Monitoring System for Fish Activity and Water Quality Environment in Offshore Fish Cage [PDF]
, 2016 在全球海洋渔业资源日益衰减的今天，深水网箱以其抗风浪、耐海流能力强、养殖容量大、高产高效、环保等优势成为现代耕海牧渔的发展方向。深水网箱养殖过程中，由于网箱离岸远，范围广，水体浑浊，不容易观察鱼群活动状态，同时也往往难以把握合适的投饲量，投饵过少将影响鱼类生长健康，过多则增大养殖饲料成本，同时剩余饵料又会污染环境。为了进行鱼群状态监测和避免饲养投喂的随意性和盲目性，急需加强深水网箱鱼群状态与水质环境监测，为正确判断鱼群食欲、科学进行投饲提供重要参考依据。本文根据深水网箱养殖环境的特殊要求 ...
邵志文
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The development of high‐performance electromagnetic protection materials integrating broadband absorption and effective shielding capabilities is hindered by challenges in simultaneously optimizing multiple electromagnetic properties through conventional material designs.
Changlong Du +9 more
wiley +1 more source
Giant Tunability of Individual Magnetic Skyrmion Size via an Oscillating Local Magnetic Field
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Magnetic skyrmions hold great promise as memory and computing elements in future spintronic devices. Despite the demonstration of various devices, techniques for addressable and high‐precision manipulation of individual skyrmions remain scarce.
Cai‐Hong Xie +13 more
wiley +1 more source
Gaoya dianqi, 2007 对550kV/4000A SF6 GIS用母线多点接地与单点接地系统中额定运行条件下不同罐体材料、不同壁厚罐体上感应电流、感应电流形成的损耗功率及其阻抗特性进行了分析计算;比较了接地方式、罐体材料及罐体壁厚对损耗功率及母线阻抗特性的影响。分析结果表明:在多点接地系统中,当罐体材料为铝材和不锈钢材时罐体损耗功率随罐体壁厚的增大而减小,罐体材料为锅炉钢时罐体损耗功率几乎不随罐体壁厚变化而变化,当罐体材料为不锈钢材和锅炉钢时的损耗功率分别是罐体材料为铝材时损耗功率的14倍和32倍。在单点接地系统中 ...
魏俊梅, 林莘, 魏长宇
doaj
Research on the Intrinsically Packaged LC Wireless Pressure Sensor [PDF]
, 2016 LC谐振无线压力传感器采用无线无源方式实现对压力信号的检测，适用于狭小封闭的空间以及高温、腐蚀的恶劣环境，在生物医疗、航空航天、工业控制等领域具有广阔的应用前景。目前，国内主要采用LTCC、HTCC技术制备LC谐振无线压力传感器，其敏感元件尺寸大，灵敏度低，且电感线圈制作在结构外部，容易受外部环境破坏，降低了传感器的实用性。而采用MEMS技术能够制备小尺寸、高灵敏度、内嵌式的LC谐振无线压力传感器，提高LC谐振无线压力传感器的实用性。因此，本论文提出并实现一种基于MEMS技术的LC内嵌式无线压力传感器 ...
郑成
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Developing low‐energy‐input electrocatalytic systems for efficient hydrogen production is crucial for advancing sustainable energy technologies. The overall hydrazine splitting (OHzS) has emerged as a promising strategy to reduce the overall energy consumption by replacing the sluggish oxygen evolution reaction.
Haozhou Chen +13 more
wiley +1 more source
Realization mechanism and performance of room-temperature gas sensors [PDF]
, 2016 降低工作温度对于提高气体传感器的安全性，增加便携式或可穿戴设备的续航时间和组建高可靠性的无线传感网络有至关重要的作用。然而对于金属氧化物气体传感器来说，工作温度的降低并不是一件简单的事情。任何定量检测的本质都是事先构建一个可量化的不稳定平衡，然后让待测物打破这个平衡来获得响应。把传感器看作一个封闭系统，工作温度的降低意味着系统稳定性的增强，以至于在较低的温度下电流（或电压）平衡难以被痕量待测气体的出现所打破。近年来有研究表明借助紫外光活化可以显著地降低气体传感器的工作温度，甚至实现了对多种气体的室温检测，
刘彬
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Harnessing solar energy for self‐heating presents an effective strategy to suppress surface ice formation. In this paper, we fabricated nano‐silver‐modified multilayer graphene sheets (Ag@MGs) that integrate photothermal and superhydrophobic properties for anti‐icing applications.
Yihan Zhang +7 more
wiley +1 more source