Results 131 to 140 of about 65,518 (228)
Guangtongxin yanjiu, 1999 高副载波复用（ＭＳＣＭ）ＡＭ－ＶＳＢＣＡＴＶ系统在国内正日渐引起人们的关注。本文提出了采用掺铒光纤放大器（ＥＤＦＡ）和线性化外调制器在系统中进行优化，以实现高副载波复用。并首次采用定量的无约束数值优化法，即单纯形法，对全系统中一些关键参数进行优化，从而为ＭＳＣＭＡＭ－ＶＳＢＣＡＴＶ系统的优化设计提供了一种有实际意义的通用方法。
刘锦高 +3 more
doaj
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Multi‐element Prussian blue analog (PBA) nanocomposites have attracted wide attention for their superior characteristics to single‐functional nanomaterials in extensive applications of diagnosis and therapy. In this study, a novel hollow nanocomposite was designed and fabricated by embedding S2− and Ag nanoparticles into a NiCuMnFe (PBA).
Tao Ji +7 more
wiley +1 more source
Gaoya dianqi, 2018 对于超、特高压变压器的设计而言,角环的优化布置是变压器端部主绝缘结构设计的重要组成部分。本文运用多目标优化算法、粒子群优化算法并结合有限元子模型计算技术,在保持原变压器内部的角环个数、各角环厚度及圆弧半径不变的基础上,分别对左、右两侧角环的位置进行优化布置。优化过程中,选取各个考核油隙中沿电力线上最小的绝缘裕度作为优化的目标函数,使角环分割的各油隙关键位置沿电力线方向的绝缘裕度尽量接近。对绕组端部角环位置优化后,不仅使得各考核区域的最小绝缘裕度浮动范围变小,而且使得整个端部绝缘的最小裕度得到了提高。
张良县 +4 more
doaj
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT In conventional piezoceramics, the coordinated change between the dielectric constant (εr) and the piezoelectric charge constant (d33) usually limits the piezoelectric voltage constant g33 (g33 = d33/εr), a critical figure of merit for piezoelectric sensors.
Xiaoying Feng +7 more
wiley +1 more source
Dianci bileiqi介电功能梯度绝缘子可以在不改变几何结构基础上，优化整体电场分布，提高沿面闪络电压。依据经典电磁场理论，得到梯度绝缘子电场分布特性及优化理论。针对盆式绝缘子，以降低沿面最大场强为优化目标，提出一种基于迭代计算的盆式绝缘子电场优化设计方案。结合电场优化理论及迭代算法流程，通过分析叠层数、介电常数上限及表层厚度等影响因素，对设计方案的电场优化效果进行对比研究。计算结果表明，对比匀质盆式绝缘子，体/表层梯度盆式绝缘子沿面最大场强降幅明显，最高可达34.37%、39.08%，优化效果显著，电场分布均匀性大大提升。
何柏娜 +8 more
doaj
Jixie chuandong, 2004 遗传算法是基于生物进化论的思想 ,生物自然选择与遗传机理的随机搜索的全局优化算法。该算法适合处理复杂和非线性优化问题。文章针对机构运动轨迹能够最佳逼近某一给定运动轨迹 ,且机构的约束较多 ,将遗传算法引入四杆机构的优化设计中 ,为避免局部收敛 ,获得全局最优解 ,在早期进化阶段采用适当放宽约束条件的方法 ,最后解决了四杆机构复杂的非线性优化问题 ,并验证了其可行性和可效性。
崔艳梅, 王丽萍, 付坤霞
doaj
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Two‐dimensional (2D) nonlayered niobium nitrides have attracted considerable interest for electrochemical energy storage. However, the synthesis of these materials is hampered by their nonlayered crystal structures, which are characterized by strong three‐dimensional chemical bonding.
Rui Huo +7 more
wiley +1 more source
Optimized treatment for severe ulcerative colitis: A case report. [PDF]
Zhong Nan Da Xue Xue Bao Yi Xue Ban, 2021 Long M, Liu M, Wu C, Mrigul K, Guo Q.
europepmc +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Efficient and durable bifunctional electrocatalysts are vital for scalable water electrolysis. Here, we realize cobalt‐vacancy (Covac) engineering in CoFeP supported on N,P‐codoped carbon nanocages (Co1‐vacFeP/NPC) through a simple route comprising a CoFe Prussian blue analog precursor, phosphidation–pyrolysis, tannic‐acid etching, and a ...
Yuan‐Liang Yuan +6 more
wiley +1 more source