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Search Results: 1 - 10 of 161088 matches for " 杨 强 "
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创业企业家的最优消费与投资
Optimal Consumption and Investment for an Entrepreneur
 [PDF]

, 招军
Finance (FIN) , 2011, DOI: 10.12677/fin.2011.11001
Abstract: 本文考虑一个面临随机需求风险的创业企业家,如何通过消费平滑策略与动态调整企业规模,实现效用最大化的公司金融问题。运用动态随机控制方法,得到了风险厌恶下企业资本的平均价值与边际价值的半闭式解及相应的最优消费与投资策略。数值结果表明,创业企业家的风险态度对企业资本的边际价值与平均价值以及相应的最优消费与投资决策具有显著的影响。
This paper considers an optimal investment problem for a risk-averse entrepreneur facing stochastic demands to maximize the expectation of total consumption utility through consumption and business investment with costly reversibility. Utilizing dynamic stochastic control, we derive semi-closed-form solutions for the average value and marginal value of the capital and the corresponding optimal consumption and investment strategies in a non-risk-neutral world. The numeric results show that the risk attitude of the entrepreneur has a significant effect on the value of the capital and the optimal consumption strategy and investment decision.
当代中国族际政治整合的挑战与对策研究
Study on the Challenges and Countermeasures of Political Integration among Ethnic Groups in Contemporary China
 [PDF]

, 兴玉
Advances in Social Sciences (ASS) , 2013, DOI: 10.12677/ASS.2013.24014
Abstract:  1949年新中国的成立标志着以中华民族为国族的民族国家的建立,中国进入了民族国家时代。而从国家的民族构成来看,中国是一个由56个民族共同组成多民族国家,是一个民族国家形态的多民族国家,为了将多个民族维持在统一的国家政治共同体中并提高国族的整体性,进行族际政治整合就成了必要的选择。但当代中国的族际政治整合同时面临着来自国际和国内的压力与挑战,分析这些压力与挑战并研究相应的对策对于我国族际政治整合的开展是有一定意义的。
The foundation of new China in 1949 marked the establishment of Chinese nation’s nation-state. From then on, China entered the nation-state era. Seen from the components of different ethnic groups, China is a multi-ethnic nation-state consisting of 56 ethnic groups. In order to maintain ethnic groups in the united political community and improve the integrity of the nation, integration of interethnic politics becomes a necessary choice. But the ethnic political integration in contemporary China is facing the international and domestic pressures and challenges at the same time. To analyze the pressures and challenges and to research the countermeasures will be of great significance to carry out the integration among Ethnic Groups in contemporary China.
基于梯级水库常规调度图的优化绘制
The Optimizing Drawing of Cascade Reservoirs Operation Chart Based on the Routine Operation
 [PDF]

元园,, 王义民
Journal of Water Resources Research (JWRR) , 2012, DOI: 10.12677/JWRR.2012.16066
Abstract: 水库调度图作为指导水电站安全高效运行的依据,一直是水库调度研究的热点,然而现有研究大多以单库调度图为对象进行优化,或是基于中长期发电优化调度模型绘制梯级水库调度图。单库优化调度图较难满足梯级调度要求,而后者虽然理论成熟、应用广泛,但存在建模、求解复杂,步骤繁琐,误差较大等的缺点。鉴此,本文提出了一种采用模拟与优化相结合的技术绘制梯级水库优化调度图的实用方法。该法通过直接优化梯级水库常规调度图的调度线,从而获得优化调度图。以乌江流域4座调节性能较好的水库构成的梯级水库为研究对象进行实例分析,模拟调度结果表明较大地提高了梯级长期发电效益,验证了该法的可靠性和有效性,从而为梯级水库优化调度图的绘制提供了新思路。
Reservoir operation chart has been a hot topic of the reservoir operation study as a basis for the guidance of the efficient and safe operation of the hydropower station. However, existing studies are mostly studying on the optimizing drawing of single reservoir, or research on the drawing of cascade reservoirs operation chart using a long-term power optimization scheduling model. Single reservoir optimized operation chart is hard to meet the cascade scheduling requirements, while the latter theory is mature, widely used, but has its flaws. For this, this paper puts forward a drawing way of cascade reservoirs optimal operation charts, using the combination technology of simulation and optimization, through the direct optimization of the cascade reservoirs conventional operation curves. For the cascade hydropower stations on the WujiangRiver, simulation scheduling results show considerably increase on the cascade long-term generation benefit. Thus verify the reliability and validity of the method, so as to provide a new idea to draw the cascade reservoirs operation chart.
DKDP表面潮解对其机械性能影响的研究
The Effects of DKDP Surface Deliquescence on Its Mechanical Properties
 [PDF]

何中凯, 曹志, 倩茹
Applied Physics (APP) , 2014, DOI: 10.12677/APP.2014.46013
Abstract:
本文采用显微拉曼光谱法和纳米压痕法对表面潮解后的磷酸二氘钾(DKDP)晶体进行了研究。光学显微镜下观察到样品表面出现大量微米级离散点状潮解区。拉曼光谱结果表明,潮解并未造成DKDP光谱的主要峰位发生改变。证明潮解过程并没有生成新的物质,不是化学反应。纳米压痕测试结果表明,荷载分别为10 g、20 g、30 g、40 g、50 g、60 g时,所测得的模量值和硬度值的变化趋势基本一致,在40 g模量随荷载增加从54.7 GPa下降至46 GPa (硬度从1.95 GPa下降至1.50 Gpa),40 g以后随荷载增加模量上升至53 GPa (硬度上升至1.67 GPa),表明DKDP表面机械性能受到潮解影响。
This deliquesced surface of DKDP, deuterated potassium dihydrogen phosphate, was studied with microscopes Raman spectroscopy and Nano-indentation. Two Raman spectra were acquired at the surface of the specimen before and after it was deliquesced. Modulus and hardness were measured with Nano-indentation under 6 different loads. Discrete deliquesced spots were observed on the surface with an optical microscope. Results show that the Raman spectra, before and after de-liquesced, are almost the same. No new products are created after deliquesced and it is not a chemical change. 6 Loads are 10 g, 20 g, 30 g, 40 g, 50 g and 60 g. The measured modulus and hardness vary with increased loads and their variation trends are nearly identical. Before 40 g, the modulus decreases with the load from 54.7 GPa to 46GPa (hardness from 1.95 GPa to 1.50 GPa). From 40 g to 60 g, the modulus raised up to 53 GPa again (hardness raised up to 1.67 GPa). Thus, the mechanical properties of the deliquesced surface have been modified.
水通道蛋白生理学功能的研究进展
The Physiological Functions of Aquaporins
 [PDF]

耿晓, 宝学
Journal of Physiology Studies (JPS) , 2014, DOI: 10.12677/JPS.2014.24004
Abstract:
水通道蛋白是介导水跨细胞膜转运的膜整合蛋白,可以高选择性地通透水并且对体内水的转运发挥调控作用。对于水通道蛋白的研究经历了从发现到结构、功能的探索,研究结果表明水通道蛋白在机体多个组织器官都有表达,发挥重要的生理作用,包括肾脏的尿浓缩功能、外分泌腺的分泌功能、大脑水合功能、神经信号传导和新陈代谢等,水通道基因突变与某些疾病的发生发展有关。因此,研究水通道蛋白的生理功能可为阐明相关疾病的发病机制和确定药物靶点提供新的思路。本文就近年来水通道蛋白的生理学研究进展予以综述。
The aquaporins (AQPs) are a family of 13 small hydrophobic integral transmembrane water channel proteins involved in transcellular and transepithelial water movement and fluid transport. The study of aquaporins has experienced from discovery to the exploration of their physiological functions. It has been found that aquaporins are expressed in various tissues and organs and they have different physiological functions, including urine concentration, exocrine gland secretion, hydration of brain, transduction of neuronal signaling and metabolism. The studies on aquaporins can provide novel ideas to the mechanism and therapy of related diseases. This review article dis-cusses the recent researches on the physiological functions of AQPs in different tissues and organs.
考虑可控负荷停电成本的微电网经济调度策略
Microgrid Economic Dispatch Considering Outage Costs of Controllable Load
 [PDF]

杨林, , 姚志
Transmission and Distribution Engineering and Technology (TDET) , 2015, DOI: 10.12677/TDET.2015.44007
Abstract:
微电网中的负荷具有灵活而易于控制管理的特点。将负荷积极参与到微电网调度计划中,可以有效提高微电网运行的经济性。本文根据影响可控负荷停电成本的各要素,建立可控负荷停电成本模型,并将其与常见的微电网调度模型结合,制定了多时间尺度下的考虑可控负荷停电成本的微电网经济调度方案,有效地将可控负荷参与到微电网经济调度中。通过对其进行仿真分析,验证了该方法的合理性和有效性。
The loads in microgrid are flexible and easy to control. The economical operation of microgrid would become more economic by loads actively participating in. A cost model of controllable load was built based on factors affecting the outage costs. Combining it and the traditional microgrid operating model, a multi-time scale microgrid operating model was constructed, engaging controllable loads in the operation effectively. By simulation analysis, the rationality and validity of the model were proved.
半同胚空间类和半拓扑性质

科学通报 , 1984,
Abstract: 一、引言半同胚与半拓扑性质的概念是由Crossley等人于1972年引入并随后进行一系列研究的。本文较深入地分析了与某个拓扑空间(X,U)具有相同半开集族的全体拓扑空间组成的拓扑族U]的结构,得到了U]中最强拓扑的两种新的结构形式。另一方面,我们研究了U]中存在最弱拓扑的条件。在此基础上,给出了拓扑空间半同胚的两个充要条件,并
磁学方法在重金属污染研究中的应用
,王勇
安全与环境工程 , 2012,
Abstract: 随着人类对环境安全的重视,重金属污染已得到广泛的关注和研究。环境磁学的诞生,使得利用环境载体的磁性特征来监测重金属污染的来源、污染范围和程度等成为可能。本文简述了重金属污染磁学监测的基本原理,并在介绍和归纳国内外磁学方法在重金属污染研究中的具体应用和研究进展的基础上,对磁学方法研究重金属污染存在的问题和今后的发展趋势进行了探讨。
湖南道县、宁远一带中泥盆统棋梓桥组中的台地前缘斜坡异地碳酸盐沉积

沉积学报 , 1985,
Abstract: 沿台地边缘斜坡沉积的古代碳酸盐再沉积物是最近十年来才引起沉积学者广泛注意的一种深水碳酸盐类型,包括碳酸盐重力流,重力滑动(滑塌)沉积及塌磊裙。重力流及由于重力作用引起的沉积物与浅水碳酸盐或深水原地碳酸盐沉积相比,有很大的差异。它们的主要岩石类型是异地碳酸盐,为一套在重力作用下顺坡而下流动的碳酸盐沉积物。前礁塌磊是台地边缘礁坠落到陡崖下的礁块堆积,也称为礁崖塌积。
湖北省保康磷矿区开采面及固体废弃物遥感信息提取方法研究
,张志
国土资源遥感 , 2009, DOI: 10.6046/gtzyyg.2009.02.18
Abstract: 统计分析了湖北保康磷矿区有关目标地物(道路、建筑物、坡耕地、植被、水体及阴影等)的SPOT5影像特征,认为它们具有一定相似性和差异性,依赖单一的遥感分类方法难以实现对矿区开采面及固体废弃物信息的准确提取。采用决策树分类方法,设置一定的分类规则,结合数字高程模型和含矿地层等相关辅助数据,逐一对矿区相关地物进行分类,经分类结果后处理,分类精度达83.4%。
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