Results 31 to 40 of about 9,120 (157)
Guangtongxin yanjiu, 1986 本文介绍一种适合140Mb/s数字光纤通信系统光发送机的实用化电路。在电路工作原理的论述中,着重对高速调制下激光器的电-光延时特性作了理论分析;对温控电路的精度进行了理论上的探讨。最后叙述了减少激光器在高速调制下的张驰振荡、自脉动及模式噪声的方法。
郑庆镒
doaj
, 2010 讨论了一类矩阵的逆奇异值问题.给定非负实数1σ,2σ,…,nσ,两非零实向量x=(x1,x2,…,xm)T,y=(y1,y2,…,yn)T,求m×n阶实矩阵A,使得1σ,2σ,…,σn为A的奇异值,并且x,y分别为A的左右奇异向量.基于Householder变换和矩阵秩1的修正方法得到了问题的算法,而且算法比较经济且易于并行,同时给出了相应的数值例子.国家自然科学基金(10531080);; 厦门理工学院科学技术研究项目 ...
卢琳璋, 吴春红
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Platinum (Pt)‐based catalysts are crucial for the commercialization of hydrogen/metal air batteries, but they suffer from Pt scarcity, high cost, and nanoparticle dissolution/agglomeration, mainly leading to performance degradation. We address this by synthesizing a PtFe alloy catalyst (PtFe–PA–NC) via a phytic acid (PA) assisted pyrolysis ...
Chenyang Shu +9 more
wiley +1 more source
Numerical Optimization Methods For Solving Several Inverse Quadratic Eigenvalue Problems [PDF]
, 2012 反二次特征值问题在结构力学、振动、控制设计、应用力学及电路理论等方面有着 广泛的应用背景。工程上往往利用有限元等技巧将结构体离散为矩阵二阶系统，并通过 测量得到的自然频率和模态来更新系统物理矩阵。 反二次特征值问题旨在构造物理矩阵使得重构的二阶系统满足给定的部分特征信 息，同时保持原始模型的结构性质：如对称性、正定性、稀疏性及内部连通性等。本文 主要探讨了几类结构化反二次特征值问题的优化算法。本文由以下四部分组成。 第一节主要介绍了反二次特征值问题的背景、已有的数值方法、及本文所涉及的几 ...
陈梅香
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Tellurium (Te), emerging as a promising alternative to sulfur (S) and selenium (Se), offers significant advantages for potassium (K) ion storage due to its comparable theoretical volumetric capacity (2619 mAh cm−3) and higher electronic conductivity (∼102 S m−1), which promotes rapid charge transfer and improves reaction kinetics.
Sung Woo Cho +7 more
wiley +1 more source
Gaoya dianqi, 2022 随着我国高压直流输电技术的不断发展，短路故障电流值也随之增加。针对直流电网中短路大电流开断这一难题，文中基于直流短路故障时断路器的工作原理研究，对短路电流采用先限流、再关断的方案，提出了一种利用限流电路进行两次限流的混合式断路器拓扑。同时，研究了限流电路参数的选取对断路器工作性能的影响，并对相关参数进行了优化。在仿真研究和理论分析的基础上，与没有第二次限流的断路器进行了比较。结果表明，该断路器可通过两次限流成功将电流限制住并在故障发生的5 ms内关断 ...
熊迪 +5 more
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868MHz wireless receive module design based on TDA5210 [PDF]
, 2011 为解决采用315 MHz或433 MHz频段无线接收模块的系统,干扰源多,接收灵敏度低,设计调试复杂等问题,提出了一种868 MHz无线接收模块的设计方案。方案中采用英飞凌低功耗单芯片fSk/ASk超外差无线接收器TdA5210,以及少量的外围分立器件。通过改善接收模块PCb中铜箔天线走向,提高接收灵敏度;在接收模块的电源和地的输入端串入磁珠,以减少来自应用系统中晶振等高频器件的噪声干扰。实验结果表明,基于TdA5210的无线接收模块,设计调试简单,干扰源少,抑制噪声能力强,接收灵敏度高,工作稳定 ...
陈良琳
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Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Ni3S2 has emerged as a promising catalyst for the electrochemical oxidation of biomass‐derived 5‐hydroxymethylfurfural (HMF) to 2,5‐furandicarboxylic acid (FDCA), driven by its distinctive physicochemical properties. However, its practical catalytic efficiency is severely hindered by abundant electrochemically inactive surface sites and poor ...
Cheng‐Feng Yi +5 more
wiley +1 more source
Fast Transient Response Low Dropout Regulator Design [PDF]
, 2012 在电子系统应用越来越广泛的今天，集成电路芯片的研发和制造越来越呈现出高速，低电压，低功耗的特点。电源管理芯片是电子系统不可或缺的重要模块，随着电子应用的多样化，电源管理芯片提供了多种对应的电源解决方案。在便携式应用领域和一些低压电子系统中，低压差线性稳压器（LowDropoutRegulator，LDO）由于成本较低，电源纹波抑制性能好，结构简单而获得了大量的应用。相对其他电源管理芯片来说，LDO线性稳压器的电源转化效率较低，因此研究具有高电源转化效率，低压差 ...
钮海洋
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Orbitally Driven Anomalous Thermal Transport Under High Pressure in Gallium Nitride
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Extreme conditions such as high pressure offer opportunities for innovative materials design and applications. For over a century, studies on thermal transport in crystals under high hydrostatic pressure have shown that lattice thermal conductivity generally exhibits a monotonic increase with pressure.
Zong‐Hao Yuan +8 more
wiley +1 more source