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Search Results: 1 - 10 of 227257 matches for " 刘雷 "
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RIGID-FLEXIBLE COUPLED DYNAMICAL ANALYSIS OF ANTENNA PEDESTAL DRIVE SYSTEMS
天线座驱动系统刚柔耦合动力学分析


力学与实践 , 2009,
Abstract: In order to analyze the dynamic characteristics of an antenna pedestal drive system, a new dynamic model called a rigid-flexible coupled model is proposed. In the new model, the deformation of spinnings and the supporting of bearings are considered. Gear tooth mesh is also taken into account based on an advanced contact model. The traditional multi-body transmission system model is improved, where the deformation of spinnings and the supporting of bearings are neglected. The simulation results reflect the dynamic characteristics of the antenna pedestal drive system, consistent with the theoretical analysis. The dynamic model and results may provide a guidance to engineering design and capability checkout.
天线座驱动系统刚柔耦合动力学分析

力学与实践 , 2009, DOI: 10.6052/1000-0992-2008-419
Abstract: 为了分析天线座驱动系统的动力学特性,建立了一种新的多级齿轮传动系统动力学模型------刚柔耦合模型,不仅考虑了轴的变形、轴承的支撑作用,而且采用了先进的轮齿接触模型,克服了采用多体动力学方法研究齿轮系统动力学时存在的诸如忽略轴承的支撑作用、轴的变形等缺陷.动力学分析的计算结果和理论分析结果相一致,较准确地反映了该系统的齿轮动力特性,对工程设计及性能校核具有指导意义.
蒙东地区煤炭下海铁路通路布局研究

铁道工程学报 , 2012,
Abstract: ?研究目的:近年来蒙东地区煤炭产量及外运量逐年攀升,除供往东三省外,经港口下海供往南方的煤炭增长迅猛。与此同时,服务蒙东煤运的多个铁路项目陆续开展前期或开工建设,将形成多条下海铁路通路。为此,有必要针对煤源、下海港及运输径路,统筹研究蒙东地区煤炭下海需求及铁路通道的合理布局。研究结论:(1)蒙东地区煤炭下海合理运距应在600~800km;(2)规划年度形成以白音华、巴其北、五间房、巴彦宝力格等煤田为主要煤源,以锦州、曹妃甸、绥中为主下海港,以白音华—大板—锦州、锡林浩特—曹妃甸、锡赤—赤绥、巴彦乌拉—新邱—阜新—义县—锦州四条组成的煤炭下海铁路通路运输体系;(3)为蒙东煤炭下海运输提供条件完备、能力大且极具弹性的保障。
大型钢制油罐的整体迁移与风险预防

武汉理工大学学报 , 2009,
Abstract: ?通过轨道牵引法,利用托架、钢制轨道、垫块、滚动体整体迁移大型钢制油罐,并对迁移过程中容易发生的罐体变形、撕裂、倾斜、碰撞、底板变形更换等风险进行了分析,提出了预防和解决方案。结果表明:此方法与传统的分割还原、机械吊运等方法相比使用安全、费用经济、操作简便。
焦碳-铁屑法处理含铬废水设备的研制

武汉理工大学学报 , 2008,
Abstract: ?在对传统处理含铬废水与焦碳-铁屑法处理含铬废水的方法进行比较的基础上提出焦碳-铁屑法处理含铬废水设备的设计方案及构成。介绍该设备的主要零部件的功能,提出了该方法处理含铬废水的工艺流程。实验表明,该设备是一种省材,成本低,能连续处理废水,标准化程度高,符合国家节能减排要求,适合于企业大批量生产的环保设备。
戊型肝炎病毒的基因组结构及生物学功能研究进展
Development of Genomic Structure and Function of Hepatitis E Virus
 [PDF]

雅昕, , 王玲
Advances in Microbiology (AMB) , 2013, DOI: 10.12677/AMB.2013.21007
Abstract:
戊型肝炎病毒(HEV)是发展中国家引起急性病毒肝炎的重要病原体之一。HEV4个主要基因型,1型和2型只感染人,通过污染的水源引起暴发流行;3型和4型属于人畜共患病原体,常引起散发病例。为进一步阐明HEV的致病和跨种系传播机理,本文就近年来在HEV基因及其蛋白质的生物学特性和功能研究方面取得的进展进行综述。
Hepatitis E virus (HEV) is one of the most important pathogens of acute viral hepatitis prevailing in developing countries. There are four major genotypes of mammalian HEV, genotype 1 and 2 are restricted to human infection, and induce epidemic hepatitis E which is mainly transmitted by contaminated water; whereas genotype 3 and 4 are zoonotic causing sporadic cases which are common in developed countries. In recent years, much more attention has been paid to the structures of viral genes and the functions of viral proteins. The research progress achieved in such field will help us uncover the veil of HEV in pathogenesis and infection.
意象图式在日语被动句教学中的探索与应用
Exploration and Application of Image Schema on the Japanese Teaching about Passive Sentences
 [PDF]

, 振新, 朱婷婷
Modern Linguistics (ML) , 2015, DOI: 10.12677/ML.2015.32007
Abstract:
借鉴日本語文法記述協会关于被动句的分类标准,将日语被动句划分为:直接被动句、间接被动句和所有者被动句。运用认知语言学中的意象图式理论,探讨日语各被动句的表现形式与其体现的事态构造之间的关系,在此基础上进一步指出:直接被动句是原型,所有者被动句介于直接被动句与间接被动句之间,与二者构成连续的统一体。这一发现为日语被动句的教学提供了新的思路和手段,同时也为日语学习者提供了一种非传统语言学的可行方式。
According to the Classification of the Japanese Grammar-Account Association (JGAA) about passive sentences, Japanese passive sentences are divided into three types: direct passive sentences, indi-rect passive sentences and owner passive sentences. In this paper, the relation between the ex-pression forms of all types of Japanese passive sentences and their event structure is discussed by ap- plying the image schema theory of cognitive linguistics. Based on it, a conclusion is further pointed out, i.e., of the unity constituted by the three types of Japanese passive sentences, direct passive sentences are the prototype while owner passive sentences are linked between the other two types. The presented conclusion provides new ideas and means for Japanese teaching of passive sentences. Meanwhile, it also provides a feasible learning style of non-traditional linguistics for Japanese learners.
我国鲆鲽类循环水养殖设施与疾病防控技术研究进展
Research Progress on Culture Equipment and Diseases Controlling of the Flounder under Circulating Water Conditions in China
 [PDF]

高淳仁, , 霁霖
Open Journal of Fisheries Research (OJFR) , 2016, DOI: 10.12677/OJFR.2016.34008
Abstract:
封闭式海水循环养殖是当前国内外先进的养殖模式,也是未来的发展方向。本文概要阐述了我国鲆鲽类循环水养殖系统的现状和规模,论述了在此条件下鲆鲽类生长和生理特性。简介了工厂化循环水条件下鲆鲽类常见的病害以及防控措施。对工厂化循环水养殖半滑舌鳎、大菱鮃等鲆鲽类的系统主要热点和难点问题,并对该领域技术和研究的发展趋势进行了探讨。
Closed circulating water system culture is the advanced culture model and is also the future trend. The paper summarized the status and the scale of the recirculating aquaculture system of the flounder in our country and discussed the growth and physiologic characteristics of the flounder under the condition. Flounders’ common diseases and control measures in the factory circulating water were introduced. We discussed the hotspot and nodus problems in circulating water culture system of the flounders such as Cynoglossus semilaevis and turbot and also discussed the devel-opment trend of technology and research in the field.
基于ANP的动态联盟项目选择评价及实证分析
,
科技进步与对策 , 2009,
Abstract: 对拟投标项目的科学评价,关键在于构建项目选择的评价指标体系。通过对动态联盟项目选择内涵和相关文献的分析,构建了评价的指标体系,考虑指标间的相互影响与制约关系,研究了网络分析法评价的可行性,建立了项目选择评价模型,应用网络分析法确定了模型中各层次指标的权重,并对某动态联盟拟投标的项目进行了系统评价与实证分析。建设项目动态联盟网络分析法(ANP)项目选择评价模型实证分析
中国东部沿海地带人地关系状态分析
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地理学报 , 2004, DOI: 10.11821/xb200402018
Abstract: 作为中国现代社会经济发展的主体发动机,东部沿海地区人地关系的演进状态和趋势不仅决定着地区自身而且决定着整个国家可持续发展的基本取向。有鉴于此,本文试图通过人地关系对应公式进行东部沿海地区人地关系演进状态的总体评价。评价的结果表明第一,与中西部相比,东部沿海地区人地关系演进的实际紧张状态严峻的多,人地关系演进系数达到了2.13(表观);第二,在地区人地关系的演进过程中,经济活动和人口集聚起着决定影响,其中尤以经济活动的作用最为关键,其贡献度达到75%;第三,未来人地关系状态的协调和改善主要取决于地区自身资源环境基础的扩展和改造能力。
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