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Search Results: 1 - 10 of 38079 matches for " 于鑫 "
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完整Coriolis力作用下非线性Rossby波的精确解
赵强,
地球物理学报 , 2008,
Abstract: 从包含完整Coriolis力的Boussinesq近似的斜压大气运动方程组出发,利用半地转近似导出β效应和地球旋转水平分量fH=2Ωcosφ共同作用下的大气非线性Rossby波动所满足的KdV方程,求得了椭圆余弦波解和孤立波解.结果分析表明,若扰动与纬度有关,Coriolis参数分量fH将影响波动传播的频率特征,并加强水平散度对斜压Rossby波的作用;如果扰动与纬度无关,则Coriolis参数分量fH的影响消失.
宏观审慎监管中的中央银行角色定位
,,,
- , 2016,
Abstract: 20 世纪80 年代以来,特别是1997 年亚洲金融危机之后,传统金融监管理论和实践屡屡受到挑战与质疑。各国学者和政策制定者逐渐认识到,与传统微观审慎监管相比,宏观审慎监管才是防范和化解金融风险的有力工具。在宏观审慎监管政策实践中,首要问题是明确监管主体。目前,尽管中央银行在各国宏观审慎监管实践中的政策地位不尽相同,但均扮演着重要角色,可以概括为决策者、主导者和参与者三种模式,且各具优缺点。本文从宏观审慎监管政策与货币政策协调性视角出发,通过两种政策的辩证关系分析和国际经验借鉴,探讨了中国人民银行以主导者角色参与宏观审慎监管政策制定和执行的可行性及面临的困难。
Since the 1980 s,especially after Asian financial crisis in 1970,traditional finance supervisiontheory and practice have been seriously discredited. Scholars and policy-makers around the world haverecognized that macro-prudential supervision is a more effective tool to prevent and defuse financial riskscompared to the traditional micro-prudential supervision. The key to successful macro-prudential supervisionin practice is to decide who should play the leading role in making the supervision. Currently the roles playedby the central banks vary from country to country,but they are all very important. Though each has its ownstrength and weakness,the central banks usually serve as the policy makers,leaders or key participants inmacro-prudential supervision. Proceeding from the perspectives of macro-prudential supervision policy andcoordinated monetary policy,this paper,based on an analysis of the dialectical relationship between thesetwo kinds of policies and the lessons drawn from the practices of other countries,is intended to examine thefeasibility of and possible difficulties in macro-prudential supervision faced by People’s Bank of China which isexpected to play a leading role in making and implementing the macro-prudential supervision policy
永磁同步风力发电机组建模和控制策略研究
Modeling and Control Research of Direct-Drive Permanent Magnet Synchronous Wind Power Generator
 [PDF]

罗亘,, , 许瑾
Journal of Electrical Engineering (JEE) , 2014, DOI: 10.12677/JEE.2014.24012
Abstract:
永磁同步发电机维护少、效率高、单机容量大,在风力发电系统中已得到广泛使用。分析永磁风力发电系统相关数学理论知识,在PSIM9.0环境下设计额定功率为3 kW的永磁风力发电系统模型,当风速信号发生阶跃变化时,观察机侧输出功率信号和并网侧直流电压信号变化情况,分析并调试系统仿真结果。最终结果显示,在不同风速情况下,风力发电系统各输出信号稳定,波形良好,与理论计算相符。为永磁风力发电系统进一步试验和研究提供了良好的基础和新的平台。
Permanent magnet synchronous generator (PMSG), with less maintenance, high efficiency, large unit capacity, has been widely used in wind power generation system (WECS). This paper analyzes the mathematical theory knowledge of the permanent magnet synchronous wind power system, and designs a rated power of 3 kW permanent magnet wind power system model under PSIM9.0 environment. When the wind speed signal generation has step change, we observe the change status of the output power signal on the machine side and the DC voltage signal changes on the grid side, analyze and debug system simulation results. The final result shows that, under different wind conditions, the output signal of wind power system is stable and waveform is good, which are consistent with the theoretical calculation. It provides a good foundation and new platform for further testing and research of permanent magnet wind power system.
糠醛生产工艺及制备方法研究进展
张璐,宏兵
化工进展 , 2013,
Abstract: 糠醛是一种应用广泛的化工原料,其现有生产工艺在产率、能耗及环境污染等方面存在较大问题。本文介绍了现有的主流生产工艺如QuakerOats工艺,Agrifuran工艺,Petrole-chimie工艺,EscherWyss工艺及Rosenlew工艺存在的不足,分析了半纤维素生成糠醛的机理及水解动力学研究、糠醛生产设备的更新改造。从溶剂体系、催化剂体系、分离方法、加热方式等多方面探讨发展新的糠醛生产工艺。提出今后的研究重点要放在开发绿色的溶剂及催化剂上,以期对生态环境的危害降至最低。
龙凤山区域大气本底站站址特征及其观测资料
Environmental Characteristics and Its Observations at Longfengshan WMO Regional Atmospheric Background Station
 [PDF]

大江, 吴艳玲, 宋庆利,, 林伟立
Climate Change Research Letters (CCRL) , 2012, DOI: 10.12677/CCRL.2012.12008
Abstract: 龙凤山区域大气本底站(以下简称龙凤山站)是东亚中高纬度地区少数几个大气本底污染监测站之一也是WMO GAW的成员站之一。本文分析和总结了龙凤山站的环境、气象和气候特征并利用2009~2010NCEP再分析资料通过后向轨迹聚类方法分析了该站的气流来源的区域分布和季节变化特征。夏季随着西南季风的建立和向北推进从渤海湾一带北上的气流途径辽宁、吉林等地抵达该站。冬季由于季风环流的影响受途经齐齐哈尔、大庆、哈尔滨等大型工业城市的西北及北方气流影响显著。在不同季节里龙凤山站都可受到移动速度相对较慢的源自东北平原气流的影响。自建站以来龙凤山站积累了大量基础数据包括常规地面气象、太阳辐射、温室气体、气溶胶、反应性气体、降水化学、地基遥感等7大类30多种观测要素。一次污染物(
基于支持向量机的蛋白质命名实体识别的研究
Research of Protein Named Entity Recognition Based on SVMs
 [PDF]

龚乐君, 付亚星, 孙啸, 谢建明,
Hans Journal of Computational Biology (HJCB) , 2011, DOI: 10.12677/hjcb.2011.12002
Abstract: 发展一种利用支持向量机识别蛋白质命名实体的方法,选择四组特征对蛋白质语料进行识别实验。实验表明,与基线系统相比,上下文特征有较小的增幅,而当前词的词性及词形的组合特征获得了最好的性能,达到78.43%的准确率。这一研究结果显示词性及词形特征在蛋白质实体识别中起着重要的作用。
This paper describes an approach to identify protein named entity using Supports Vector Machines (SVMs), and selects four groups of features to do experiments for the protein corpus. Experiment results show the system performance of context features increases smaller than baseline system, and the combined feature of part of speech (POS) and word type is achieved 78.43% accuracy which is the best performance in all ex- periments. The research results show the combined feature of POS and word type play important roles in the protein entity recognition.
股骨粗隆周围骨折PFNA治疗体会
Experience in the Treatment of Intertrochanteric Fractures with PFNA
 [PDF]

徐忠露, 常明杰, 孙鹤, , 姜军, 冯兆艳
Hans Journal of Surgery (HJS) , 2013, DOI: 10.12677/HJS.2013.23004
Abstract: 目的:探讨PFNA(螺旋刀片防旋股骨近端髓内钉系统)治疗股骨粗隆周围骨折的临床疗效。方法:20108月至20118月,对20例股骨粗隆周围骨折的患者行闭合复位PFNA固定,其中11例为股骨粗隆部骨折,骨折按Evans分型[1]9例股骨粗隆下骨折,骨折按Seinsheimer分类[2],所有患者获得8~48周随访。结果:骨折全部愈合,愈合时间为
Data Lumber Mill Based on Duckling Application Integration Framework
基于Duckling应用集成框架的数据集成与共享工具DLM

李方,南凯,建军
计算机系统应用 , 2010,
Abstract: Integration and visualization for heterogeneous scientific data is a hot topic in e-Science applications. This paper presents generic information integration and sharing tool based on virtual research environment workbench (duckling) application integration framework. The tool uses portlet technology, is a web application, proving generic data collection, data process, data visualization and data download function, solves the data collection, process and sharing problem in s-science applications. This tool has been realized and used in the atmosphere, meteorological and biological- related projects.
一种改进的分数阶微分掩模算子
王卫星,,赖均
模式识别与人工智能 , 2010,
Abstract: 分数阶微分理论用于图像处理是近期一个新的研究课题。文中从分数阶微分对图像细微细节的增强能力出发,对分数阶微分的机理进行分析,且根据分数阶微分Tiansi算子的作用特点,提出一种可大幅增强边缘信息值的改进Tiansi算子方法。具体的做法是将Tiansi模板分解为8个不同方向的小模板,得到像素点周围8个方向的加权求和值。然后将8个值进行不同的分组,得到增强幅度不同的3种改进方法。最后通过增强的实验表明,对于岩石节理裂隙图像而言,改进方法可有效增强边缘并且比传统算子得到更丰富的细节信息。
受污染水源饮用水处理工艺中的有机氮类化合物
古励,刘冰,
科学通报 , 2010,
Abstract: 溶解性有机氮类化合物(dissolvedorganicnitrogen,DON)是目前饮用水领域关注的新问题.以浙江北部某水厂为对象,研究了受污染水源饮用水处理工艺中的DON的浓度水平和变化规律.结果表明,目前该水厂水源水中DON浓度偏高,水厂所采用的处理工艺对DON的去除效率欠佳;某些处理单元中的微生物活动可在一定程度上增加水中DON的浓度,降低DOC/DON值,可能会导致饮用水的遗传毒理学安全风险增大.
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