Results 21 to 30 of about 6,932 (168)
MXene‐Based Electromagnetic Attenuation Materials in Microwave and Terahertz Bands
Rare Metals, EarlyView.ABSTRACT MXenes exhibit considerable potential for developing high‐performance electromagnetic (EM) shielding and absorption materials operating across microwave and terahertz frequencies, due to their tunable surface chemistry and exceptional charge carrier transport properties.
Guozheng Zhang +9 more
wiley +1 more source
全球能源互联网, 2020 信息通信技术的快速发展使得电力系统成为典型的信息物理系统（cyber physical systems,CPS）。在电网侧控制日趋智能化的同时，也引入了网络攻击的风险。本文基于关联矩阵模型分析了网络攻击对电力CPS的影响，然后针对攻击后的信息组件、物理设备状态对后续控制策略的影响，提出了信息物理协同的双层控制策略调整方法，通过IEEE标准系统验证所提方法的可行性和有效性。
蔡星浦, 王琦, 黄建业, 李周
doaj +1 more source
Fine-grained privacy operation control method for layout documents [PDF]
, 2023 In view of the problem of privacy information disclosure caused by uncontrolled forwarding in the context of frequent exchange of privacy information, a fine-grained privacy operation control method for layout documents was proposed, which could achieve ...
Ben NIU +5 more
core +1 more source
Rare Metals, EarlyView.ABSTRACT Transition metal‐based amorphous/crystalline (a/c) heterostructured catalysts have garnered significant attention due to their exceptional activity, stability, and cost‐effectiveness. However, the precise synergistic regulation of interfacial composition and phase states remains challenging.
Haoran Li +3 more
wiley +1 more source
Gaoya dianqi, 2023 为了解决光伏发电在电网电压跌落过程中，逆变器两侧功率不平衡出现过电流和过电压的问题，设计了一种定功率跟踪控制的光伏并网低电压穿越策略。通过定功率跟踪控制对光伏阵列输出功率进行调节，根据电压跌落深度，合理给定功率参考值，控制光伏阵列的功率输出，实现交、直流侧功率的快速平衡，限制直流母线电压的增长。通过逆变器无功补偿控制，不仅能限制并网电流在安全范围内，还能够根据跌落深度提供无功支撑，有效地利用了逆变器自身的无功调节能力。结果表明，该策略能够抑制过电压和过电流，使系统具备一定的低电压穿越能力。最后 ...
董广凯 +4 more
doaj
全球能源互联网, 2019 针对应用于交直流配电网的电力电子变压器（power electronic transformer, PET），分析了输入级MMC子模块电容电压波动的机理，结合电力电子变压器的特殊结构，提出了一种优化运行控制策略，通过在DC/DC变换器的控制环节上增加电流修正量，以减小输入级MMC子模块电容电压波动。利用Matlab建立了电力电子变压器的仿真模型，通过仿真验证了控制策略的有效性。
檀政 +5 more
doaj +1 more source
Development of a model-based optimal control strategy of Centrifugal Chiller System [PDF]
, 2017 2006-2007 > Academic research: refereed > Publication in refereed journalVersion of ...
Wang, SW, Xu, XH
core
Advances in Elemene Nanodelivery Systems: From Material Design to Disease Treatment
Rare Metals, EarlyView.ABSTRACT Elemene (ELE) is a bioactive sesquiterpenoid extracted from traditional Chinese herbs, demonstrating broad‐spectrum antitumor, anti‐inflammatory, and analgesic properties with significant therapeutic potential. However, its clinical utility is constrained by inherent physicochemical limitations, including volatility and hydrophobicity, which ...
Xiao Wang +9 more
wiley +1 more source
基于改进载波移相SPWM的链式STATCOM电容电压平衡控制策略
Gaoya dianqi, 2012 介绍了传统载波移相SPWM及脉冲循环换位调制策略,指出了上述方法由于级联H逆变桥的电路参数及损耗差异等因素,无法真正实现链式STATCOM的电容电压平衡。笔者通过对传统载波移相SPWM调制策略进行改进,提出了一种新的链式STATCOM电容电压平衡控制策略,分析了该策略的基本原理与实现过程。通过PSCAD/EMTDC对该控制策略进行了仿真,结果说明,该策略可以很好地实现电容电压的平衡,而且对上层控制、装置的谐波特性不会产生影响。
刘正富, 徐政, 刘为群
doaj
IMC-PID Controller Design for Linear Systems with Parametric Uncertainties [PDF]
, 2015 控制系统控制品质的好坏直接决定了生产品质和效益，而工业过程控制中 百分之九十以上的控制器仍是PID控制器。于是，PID控制器参数整定一直以 来是工程应用和理论研究的核心问题之一。众多PID整定法中，IMC-PID控制 器参数整定方法脱颖而出，越来越广受工业控制过程的青睐。原因在于，基 于IMC的PID控制器对模型要求较低，甚至在高阶低阶、不稳定或非线性等情 况下，它都能获得有效的控制品质。而且IMC-PID仅有一个整定参数，该参数 调整与系统动态品质和鲁棒性的关系比较明确，从而无需繁杂的整定就可以使 ...
章垚
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