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Search Results: 1 - 10 of 157749 matches for " 杨庆 "
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基于改进爬山法的最大功率跟踪控制研究
Maximum Power Point Tracking Control Based on Improved Hill Climbing Method
 [PDF]

, 屈克
Sustainable Energy (SE) , 2013, DOI: 10.12677/SE.2013.33010
Abstract: 为实现风能的最大功率跟踪控制,本文在传统爬山法的基础之上进行了改进,提出了一种1/2变步长的爬山法,该方法能够快速而准确的实现最大功率追踪,有效的改善了系统的输出特性,提高了系统输出效率。仿真结果表明了该方法能够提高风能最大功率跟踪的快速性和稳定性。
To achieve the wind energy maximum power point tracking control, this paper makes an improvement based on the traditional hill climbing method. A 1/2 variable step hill climbing method is proposed, which can achieve the maximum power point tracking rapidly and steadily, and the output characteristics and efficiency of the system are improved. The simulation results show that this method can improve the speed and stability of the maximum power point tracking of wind energy.
甘蔗幼叶组织培养中培养基的优化
 
北方园艺 , 2010, DOI: 10.11937/bfyy.2010014053
Abstract:
丛枝病对泡桐木材材性的影响

西北农林科技大学学报(自然科学版) , 2002,
Abstract: 对感染丛枝病的泡桐木材和正常泡桐木材的主要物理力学性能进行了测试,并对二者作了对比分析,结果表明,丛枝病显著降低了泡桐材的密度,抗压强度,抗弯强度和抗弯弹性模量,从而降低其使用价值,影响其使用范围。
我国癌症患者自我管理的文献计量分析
Bibliometrical Analysis on the Current Research Status of Self-Management in Cancer Patients in China
 [PDF]

,, 张金花, 张爱华
Nursing Science (NS) , 2016, DOI: 10.12677/NS.2016.53009
Abstract:
目的:使用文献计量法分析我国癌症患者自我管理研究的现状和趋势。方法:通过制定专业检索策略在CNKI数据库、万方数据库、维普数据库中进行文献检索,导出文献的题目、发表时间、作者、文献来源、摘要、关键词、基金等内容,建立Excel数据库并进行统计分析。结果:我国癌症患者自我管理相关研究的文献数量逐年快速增长。国内期刊最早于2002年发表癌症患者自我管理相关文献,且发表文献数量从2010年~2015年呈逐年上升趋势;文献类型以调查报告类最多(60.78%),综述类(17.65%)次之;研究内容主要集中在癌症患者自我管理效果评价和研究进展(分别占44.12%、19.61%)方面;研究设计欠严谨,文献质量不高,统计分析方法较单一;文献中采用最多的量表是癌症患者自我效能感量表。结论:我国癌症患者自我管理相关研究尚处于起步阶段,近几年越来越受到关注,但在研究方法、研究领域及研究内容等方面有进一步发展空间。
Aim: To investigate current research status of self-management in patients with cancer in China by bibliometrical method. Method: Literatures were retrieved from “CNKI”, “Wanfang”, “Weipu” in the professional retrieval formula, and the title, published year, author, sources of literature, abstract, keywords, fund, etc. were exported to establish Excel database. Results: The number of the papers on the self-management of cancer patients in China grew fast. The literatures about self-management in cancer were published as early as 2002, and the number of papers showed a rising trend from 2010 to 2015. Among the paper types, the report was 60.78%, the review was 17.65%. Research content is mainly concentrated on self management effect evaluation and re-search progress (44.12% and 19.61%, respectively). The research design is less rigorous, the quality of literature is not high and statistical analysis method is relatively simple. Most researchers used self-efficacy scale to evaluate the self-management of patients. Conclusions: The related research of self-management is still in the initial stage and has got more and more attention in recent years, but has further development space on research method, field, and contents.
土-水特征曲线测定过程中潜在影响因素与异常现象研究
,
岩土力学 , 2014,
Abstract: 基于压力板仪对相同制样参数的4个环刀试样与12个三轴试样进行土-水特征曲线(swcc)试验,研究影响试验的各种潜在因素以及相关的异常现象。试验结果表明:即便是相同条件制备的试样,其swcc之间也会存在差异性,这种差异与土的颗粒级配不良有直接关系,而与平衡时间无关;蒸发效应在swcc试验中持续存在,并在平衡后期成为失水的主要因素,因此,对平衡条件应适当修正;试样的侧面防护对试样的swcc影响显著,特别对于大高径比试样,蒸发效应将因其侧面防护脱离而成为失水的主要因素,严重影响swcc的试验结果;横向裂纹这一异常现象并未影响swcc测量结果,但其产生机制却可能反应了轴平移技术的不足,值得进一步研究。根据上述研究结果和其他相关试验成果,对swcc试验提出建议和改进方法。
江苏省银行业发展小微企业信贷业务中的问题及其对策
Micro Finance Business Problems and Policy of M Bank in Jiangsu Province
 [PDF]

,, 耿多
Service Science and Management (SSEM) , 2014, DOI: 10.12677/SSEM.2014.34B006
Abstract:

小微企业是促进江苏经济发展的重要力量。由于小微企业往往缺乏银行认可的抵押物或担保人,且融资具有“短、频、急”特点,导致其融资难。商业银行重视小微信贷业务的发展,有利于寻找到利润新的增长点。银行只有加强创新,加强与企业互利合作,才能开发出适合小微企业的业务,提高市场竞争力。

Micro Finance Business is the important force to promote the development of economy in Jiangsu. Lacking of the mortgaged property or the guarantor approved by the bank, and with the characteristics of “short, frequency, and urgent”, Micro Finance Business are easy to be lost in the financing difficulties. It is helpful for the commercial banks to find the new profit growth point when they pay attention to the development of Micro Finance Business. Only by enhancing innovation, strengthening the mutual beneficial cooperation with the enterprise can Micro Finance Business find a way to survive and improve the market competitiveness. 


我国环保投资研究综述
Research Reviews of Environmental Protection Investment of China
 [PDF]

, 肖宁, 美丽
World Economic Research (WER) , 2014, DOI: 10.12677/WER.2014.34007
Abstract:
本文对我国环保投资的概念、环保投资资金总量、环保投资结构、环保资金利用效率等问题结合国内外相关研究文献进行了梳理。
In this paper, the concepts of environmental protection investment in our country, the environ-mental protection investment amount, investment structure, environmental protection fund use efficiency in combination with related literature at home and abroad were combed.
有机硅改性聚丙烯酸酯纳米乳液的聚合稳定性研究
The Stability of Emulsion Polymerization for Organosiloxane Modified Acrylate Nanolatex
 [PDF]

, 普江
Hans Journal of Chemical Engineering and Technology (HJCET) , 2016, DOI: 10.12677/HJCET.2016.62004
Abstract:
以甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)为主单体,利用不同乳液聚合工艺合成了有机硅改性聚丙烯酸酯纳米乳液,通过测定聚合过程的凝聚率及单体转化率,考察了聚合工艺、反应温度、乳化剂用量、乙烯基三乙氧基硅烷(A-151)用量、甲基丙烯酸羟基乙基酯(HEMA)用量、甲基丙烯酸(MAA)用量、pH值等因素对反应稳定性的影响。结果表明:采用半连续滴加工艺,温度在80℃~85℃,引发剂、复合乳化剂、有机硅A-151、HEMA、MAA的质量百分含量分别为0.5%、3%、4%、2%、2%时反应过程稳定性较好,凝聚物的质量百分含量低于0.5%,乳液粒径为80 nm左右,固含量40%。提高乳化剂用量有利于改善聚合反应的稳定性;升高温度、增加A-151用量不利于聚合反应过程的稳定;而搅拌速率、pH值和引发剂用量均存在使乳液聚合过程稳定的最佳值。
Organosiloxane modified acrylate nanolatex was synthesized by different emulsion polymerization processes with methylmethacrylate (MMA) and butylacrylate (BA) as main monomers. The effects of polymerization methods, reaction temperatures, amounts of initiator, emulsifier, vinyl-triethoxysilane (A151), 2-hydroxyethl methacrylate (HEMA), methyl acrylic acid (MAA) contents and pH on polymerization stability were investigated by measuring coagulation rate and monomer conversion. The results showed that with semi-continuous emulsion polymerization, organosiloxane modified acrylate nanolatex with particle size of about 80 nm and with low coagulation rate of 0.5% as well as solid content of 40 wt% was obtained under the condition of the better reaction stability when temperature at 80?C - 85?C, the mass fraction of initiator, emulsifier, A151, HEMA, MAA at 0.5%, 3%, 4%, 2%, 2% respectively. The increase of emulsifier contents can improve the stability of the polymerization process; but the temperature increase and the more dosage of A-151 are not conducive to the reaction stability. The optimal values for the stirring speed, pH and dosage of initiator exist for the stable state in emulsion polymerization.
甲基丙烯酰氧乙基二甲基苄基氯化铵的合成
The Synthesis of Methacryloyl Oxyethyl Dimethyl-Benzyl Ammonium Chloride
 [PDF]

, 普江
Hans Journal of Chemical Engineering and Technology (HJCET) , 2016, DOI: 10.12677/HJCET.2016.66014
Abstract:
以甲基丙烯酸二甲胺基乙酯和氯化苄为原料合成了甲基丙烯酰氧乙基二甲基苄基氯化铵,分析了温度、原料配比、反应时间、溶剂量等因素对产品产率以及洗涤次数对产品纯度的影响。结果表明:在试验条件下,提高反应温度和延长反应时间有利于产品产率的提高;产品产率随二氯甲烷用量的增加先增加后下降,而随反应体系中氯化苄摩尔量的增加而先增大后趋于平稳。采用傅里叶变换红外光谱(FT-IR)对产物进行了表征;通过正交实验确定了最佳反应条件。
The synthesis of Methacryloyl Oxyethyl Dimethylbenzyl Ammonium Chloride (DMBC) was carried out with dimethylaminoethyl methacrylate and benzyl chloride as raw materials and the effects of reaction temperatures, ratio of raw materials, reaction time and solvent amounts on yields of DMBC as well as the relation of washing times to the purity of the product were studied. The result showed that the increase of reaction temperature and prolonging the reaction time are conducive to the improvement of product yields. The product yield increases and then decreases with the quantity increase of the solvent dichloromethane, but increases and then levels off with the amounts of benzyl chloride. The molecular structure of the product was determined by means of Fourier transform infrared spectroscopy (FT-IR) and the optimum reaction conditions were obtained by orthogonal experiments.
一个大型能源系统的线性规划模型

系统工程理论与实践 , 1986,
Abstract: 本文在考虑了煤矿、运输(铁路和港口)、电站各自不同的基建和生产规律以及三者之间相互关联相互制约关系的基础上,提出了一个可用来求得以燃煤电站替代燃油电站的最佳方案和相应最佳经济效益的线性规划模型。同时还给出了通过对实例进行计算得出的结论。
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