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Search Results: 1 - 10 of 98664 matches for " 孔华 "
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APF中完美谐波消除法的仿真与分析
Simulation and Analysis of the Perfect Harmonic Cancellation Method for APF
 [PDF]

, 王宝
Smart Grid (SG) , 2015, DOI: 10.12677/SG.2015.56034
Abstract:
谐波检测是有源电力滤波器(Active Power Filter, APF)的重要控制策略之一,当电网电压不平衡或畸变时,采用传统谐波检测方法会导致APF的谐波检测产生误差,最终的补偿效果变差。本文基于瞬时无功功率理论,推导了完美谐波消除法(Perfect Harmonic Cancellation, PHC)的补偿电流计算公式。PHC法检测谐波时提取了电网电压的正序基波分量,排除电网不平衡和畸变的影响,减小了谐波检测的误差。最后,本文对PHC法进行仿真验证,分别仿真了电网电压正常和电网电压畸变或畸变的情况,并与传统的p-q法和d-q法的补偿效果进行对比,证明了在电网电压不平衡或畸变的情况下,采用PHC法的APF具有更理想的补偿效果,验证了PHC法的正确性和优越性。
Harmonic detection is one of the most important control strategies in active power filter (APF). When the grid voltage is under distorted or unbalanced circumstance, the harmonic detection of APF causes error using the conventional harmonic detection methods, and the compensation effect is unsatisfactory. The compensating current equation of the perfect harmonic cancellation (PHC) is derived based on Instantaneous Reactive Power Theory in the paper. The PHC method uses positive sequence components of the grid voltage without the effect of distortion and unbalance while detecting harmonic. It makes for error reduction. Finally, the PHC method is simulated in the paper when the grid voltage is under normal circumstance or distorted and unbalanced circumstance. The simulation results verify that the APF using the PHC method has more satisfied compensation effect when the grid voltage is under distorted and unbalanced circumstance, and it proves that the PHC method is correct and superior.
城镇职工基本养老保险基金系统动力学模型分析
System Dynamics Model Analysis on Basic Endowment Insurance Fund of Town Employees
 [PDF]

祥东, 刘欢, 王卫
Advances in Social Sciences (ASS) , 2015, DOI: 10.12677/ASS.2015.44046
Abstract:
根据城镇职工养老保险制度的相关规定,结合人社部公报和统计年鉴的数据,构建了城镇职工养老保险基金收支的系统动力学模型,以老化链人口模型取代传统生命表预测模型,预测了20年内的养老保险基金的收支情况,测算了基金在目标期内能否保持平衡,并针对影响平衡的主要因素提出相关意见,以确保保险基金的有效运行。
According to the relevant provisions of endowment insurance system for urban workers, a system dynamics model for urban workers pension fund payments is built based on the data from Ministry of Human Resources and Social Bulletin and Statistical Yearbook. With population aging chain model instead of traditional forecasting model, the system dynamics model predicts the income and expenditure of the fund in the next 20 years, estimates the balance of the fund in the target period, and makes relevant comments on the main factors affecting the balance to ensure the effective operation.
基于养老保险基金的保值增值影响因子研究
Research on the Impact Factor of Preserving and Increasing Value Based on the Endow-ment Insurance Fund
 [PDF]

刘欢, 祥东, 王卫
Finance (FIN) , 2016, DOI: 10.12677/FIN.2016.61002
Abstract:

针对今年国家养老保险基金入市政策的提出,论文运用层次分析法理论,通过对GDP、CPI指数、利率、通货膨胀率、发行量以及基金累计结余等六个主要因素进行分析,找出对养老保险基金影响最大的因子——CPI指数,从而为养老保险基金入市指明了方向,为养老保险基金的保值增值提供了依据。

For this year’s national pension fund market policy is proposed, this paper by using hierarchy theory analysis method analyzed the six main factors, which are GDP, CPI, interest rate, inflation rate, circulation and the amount of funds accumulated balances. And we find the greatest impact on the pension fund’s factor—CPI index. Thus we point out the direction for the pension fund on the market and provide a basis for increasing the value of pension funds.

某些抗氧化剂对体外辐射诱导的红细胞钾离子渗漏的影响
陈瑷,
生物化学与生物物理进展 , 1985,
Abstract: 脂质体辐射研究说明钾离子的渗漏量是照射剂量的函数,并与脂质过氧化物的生成相平行。Kocmierska Grodzka 对全身照射大鼠肝体外灌注试验观察到灌注液中钾离子含量增加,并与肝溶酶体脂质过氧化物含量升高相关。Prince等对缺乏和不缺乏维生素E(VE)小鼠的红细胞(RBC)体外辐射研究发现,前者钾离子的渗漏远较后者为明显。以上事实说明,辐射诱导的RBC钾离子渗漏与RBC膜的脂质过氧化作用有关。辐射脂质过氧化作用的特点之一是剂量率效应。最近Konings报道了辐
云南省可培养丝孢真菌资源的调查研究Ⅱ

生物多样性 , 1995,
Abstract: 本文继续报道曲霉属的16个分类群;杂色曲霉原变种,杂色曲霉疣梗变种,聚多曲霉,焦曲霉,土曲霉原变种,土曲霉金色变种,黄柄曲霉,温特曲霉,黄曲霉原变种,黄曲霉柱头变种,溜曲霉,炭黑曲霉,黑曲霉,泡盛曲霉,塔宾曲霉和日本曲霉。
Investigations on resources of cultural Hyphomycetes in Yunnan Province IV/
云南省可培养丝孢真菌资源的调查研究(Ⅳ)


生物多样性 , 1996,
Abstract: 本文报道裸胞壳属和新萨托菌属的如下8个种:四脊裸胞壳、褶皱裸胞壳、费希新萨托菌、光滑新萨托菌、刺孢新萨托菌、宽脊新萨托菌、浅黄新萨托菌和四绕新萨托菌。其中,后面的3个种是我国的新记录种,并有详细的描述、线条图和子囊孢子的扫描照片。
云南省可培养丝孢真菌资源的调查研究Ⅰ

生物多样性 , 1994,
Abstract: 作者于1992年在云南省实地考察,历时60天。在此期间共采集了土壤样品和其他材料共414号,并从这些基物中分离到大量菌株,研究结果将陆续整理并发表。除新种、罕见种和我国新记录种进行详细描述并附图外,其他物种均以名录形式予以报道。本文报道曲霉属(Aspergillus)的8个分类单位:帚状曲霉,烟色曲霉原变种,烟色曲霉椭孢变种,绿垂曲霉,棒曲霉,矮棒曲霉,烟束曲霉和爪甲曲霉。
云南省可培养丝孢真菌资源的调查研究

生物多样性 , 1996,
Abstract: 本文报道曲霉属及其相关的有性型属、即散囊菌属和裸胞壳属的分类群共15个,其中新变种1个,我国新记录3个。它们是:日本曲霉小囊变种(新变种),赭曲霉,蜂蜜曲霉,孔曲霉,埋藏曲霉(新记录),佩特曲霉(新记录)、亮白曲霉,阿姆斯特丹散囊菌,谢瓦散囊菌,腊叶散囊菌,赤散囊菌,匍匐散囊菌原变种,构巢裸胞壳,无冠裸胞壳和刺孢裸胞壳(新记录)。
新千年的挑战:第三届世界植物化感作用大会综述

应用生态学报 , 2003,
Abstract: 新千年的挑战:第三届世界植物化感作用大会综述@孔垂华$华南农业大学热带亚热带生态研究所!广州510642
篮状菌属的一个新种

菌物学报 , 1999,
Abstract: 新种短密篮状菌(Talaromyces brevicompactus sp. Nov.),其无性型为短密梅丽霉(Merimbla brevicompacta sp.nov.)。它的子囊果原基可能是由卷曲的菌丝形成;子囊孢子的壁平滑或近于平滑;帚状枝主要是三轮生或三轮和双轮生于同一个孢梗茎的顶端,偶有双轮生或不规则者。这些特征和近似种榛色篮状菌T. arellaneus (Thom & Turesson)C. Rbenj.]具有明显的区别。另外,该新种在一般标准条件下培养未发现有性型。在偶然的情况下发现了有性型。曾 几次重复试验,只在查氏(CA)斜面上20℃时才产生有性型(详见正文)。但是,它也很快就完全失去了产生有性型的能力。
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