四川大学学报. 自然科学版, 1993 为各种开关结构的直流功率变换器提出一种新的、统一的建模方法。该法的基本途径是:将变换器中的全部时变开关集中在一个子网络里,用时间平均技术及脉冲响应法,导出开关子网络的低频等效模型,与变换器的其它部分连结起来,构成了可用SPICE作辅助分析的全等效电路。该方法能够在计算机辅助下,对开关变换器作瞬态分析、输人-输出传递函数的频响分析(纹波抑制特性)、控制信号占空比与输出的交流分析。给出了分析实例。
倪治中, 余伟萍
doaj
[Development and performance testing of a high-sensitivity pulsed flame photometric detector]. [PDF]
Se PuChen JB +4 more
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[Effect of leg-split-free lateral decubitus position and lithotomy position on renal pelvic pressure and clinical outcomes during flexible ureteroscopic lithotripsy]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanLai S +6 more
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[Research on electrooculography artifact removal from electroencephalography signals based on frequency slice wavelet transform]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiFu H +5 more
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[Coupling characteristics of cellular electroporation and electrodeformation based on dynamic Young's modulus: influence of membrane thickness]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiWei X, Zou S, Guo F, Liu L.
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, 2015 湿地由于具有较高的初级生产力以及较低的有机质降解速率而成为缓解全球变暖的潜在有效碳汇.虽然近年来中国湿地生态系统CO2交换过程及其影响机制研究取得了一系列进展,但尚缺乏对数据进行系统性整合分析.基于29篇文献的数据,对中国21个典型湿地植被净生态系统CO2交换(NEE)、生态系统呼吸(Reco)、总初级生产力(GPP)、NEE的光响应参数以及Reco的温度响应参数进行整合分析,并探讨了这些指标对温度与降雨的响应.结果表明:年尺度上,气温和降雨量对NEE(R2=50%,R2=57%)、GPP(R2=60%,
韩广轩, 初小静
core
Gaoya dianqi针对新能源集中送出系统的人工接地短路试验和仿真结果表明，风电、光伏汇集线路发生单相瞬时接地故障后，系统在故障相分闸至重合期间存在暂态过电压，并已成为制约新能源送出能力的主要因素之一。文中基于对典型新能源集中送出工程暂态过电压的仿真计算和人工接地短路试验结果，分析了汇集线路故障发生及清除后暂态过电压的阶段性特征及其产生机制；研究了静止无功发生器（static var generator，SVG）在原有控制策略下的无功响应情况与系统过电压情况的关联性，分析了原有策略的缺陷 ...
王晨星 +4 more
doaj
[Noninvasive nanosecond transcranial pulsed electric fields: deep-penetrating, high-field stimulation for suppressing hippocampal amyloid-β and improving cognitive function in an Alzheimer's disease model]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiChen Y, Yao C, Yan F, Xiao P, Lu X.
europepmc +1 more source
[Duchenne muscular dystrophy-associated cardiomyopathy: advances in diagnosis and management]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiGu J, Liu YH, Hong SQ.
europepmc +1 more source
[Research progress on immune microenvironment imbalance and targeted interventions in osteoarthritis comorbid with diabetes mellitus]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiSun Y, Yang Y.
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