oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 244 )

2018 ( 4925 )

2017 ( 5213 )

2016 ( 5461 )

Custom range...

Search Results: 1 - 10 of 231618 matches for " 周军文 "
All listed articles are free for downloading (OA Articles)
Page 1 /231618
Display every page Item
湖南省农业经济增长的动态面板分析
Dynamic Panel Analysis of Hunan Agricultural Economic Growth
 [PDF]

,
World Economic Research (WER) , 2015, DOI: 10.12677/WER.2015.44008
Abstract:
基于1988~2012年湖南省14个市州动态面板数据,运用广义矩估计GMM方法,对湖南省农业经济增长的影响因素进行实证研究。研究发现,前一期的农业经济、农作物播种面积、农业机械总动力和化肥施用量对农业经济增长有着显著的正向促进影响。有效灌溉面积和农业劳动力人数对农业经济增长具有负向影响。在此基础上,就促进湖南省农业经济增长提出了政策建议。
Based on dynamic panel data of 14 regions in Hunan Province from 1988 to 2012 and by applying the method of GMM estimation, this paper conducts an empirical study of the impact of Hunan agricultural economic growth. The result identifies that the former agricultural economic growth, the agricultural crop sown area, the total power of agricultural machinery and fertilizer input have a positive function of agricultural economic growth; while agricultural labor and effective irrigate area have a negative impact. On this basis, this paper puts forward policies to improve the growth of agricultural economy.
湖南省农村金融发展与农业全要素生产率的动态关系研究—基于DEA与VAR的实证分析
Research on the Interaction between Rural Financial Development and Agricultural Total Factor Productivity—Empirical Analysis Based on the Method of DEA and VAR Model
 [PDF]

,
World Economic Research (WER) , 2016, DOI: 10.12677/WER.2016.53008
Abstract:
本文利用1988~2012年湖南省14个市州的农业指标数据,运用DEA Malmquist指数方法测算了农业技术效率、农业技术进步以及农业全要素生产率,同时利用1988~2012年湖南省农村金融发展的数据测算了农村金融发展规模、农村金融发展效率及农村金融发展结构;然后利用协整检验和脉冲响应函数分析湖南省农村金融发展三个指标分别与湖南省农业技术效率、技术进步、农业全要素生产率的相互影响。结果表明:湖南省农村金融发展三个指标分别与其农业技术效率、技术进步和全要素生产率具有长期稳定均衡关系;金融发展规模对农业技术进步及农业全要素生产率影响具有中短期作用,金融发展效率对两者具有长期的影响作用,而金融发展结构对农业技术进步及农业全要素生产率影响为负,对农业技术效率影响为正;农业技术进步与农业全要素生产率对农村金融发展影响相似,前期具有正向影响,而后期具有负向影响;农业技术效率对农村金融发展前期具有正向影响,中期具有负向影响,而后期具有正向影响。
Using DEA Malmquist index, this paper measures the agricultural total factor productivity levels, the efficiency of agricultural technology and the agricultural technological progress in 14 regions of Hunan province during 1988-2012. While using correlated data in Hunan rural finance devel-opment, it also estimates the development scale, development efficiency and development struc-ture of rural financial. Interaction impacts between three indicators of rural financial development and technological efficiency, technological advances and TFP will be analyzed respectively through cointegration test and impulse response function. The results show that: there’s a long-term stable equilibrium relationship between the three indicators of the rural financial development and its agricultural technical efficiency, technological progress and TFP in Hunan province. Financial development scale has short-term and medium-term effects on technological progress; TFP and financial development efficiency have long-term impacts on them, while the financial development structure has negative impacts on agricultural technological progress and TFP, and positive impacts on the efficiency of agricultural technology. Agricultural technological progress and TFP have similar impacts on rural financial development: that is, positive impacts in the earlier stage, negative impacts in the later. Agricultural technical efficiency has positive impacts on rural finance in the earlier stage, negative impacts in the middle, and positive impacts in the later.
复杂地形地表风场诊断模式的改进及在湖北省的应用
,
地理学报 , 1992, DOI: 10.11821/xb199205008
Abstract: 本文结合湖北省梅雨期环流和地形的实际情况,对Mass-Dempsey一层中尺度模式作了改进,通过若干实例的数值试验和对比分析,说明改进后的模式对该地地表流场有较强的诊断能力,也可以为当地降水预报提供参考依据。
教育电子身份认证系统的安全策略研究
A Study on Security Strategies of Educational Electronic Identity Authentication System
 [PDF]

庆华, 刘磊, , 唐俊龙, 唐立
Computer Science and Application (CSA) , 2016, DOI: 10.12677/CSA.2016.66043
Abstract: 教育电子身份认证系统涵盖了以e2ID提供认证服务的教育应用系统日常运行的方方面面,因而保障其安全、稳定地运行显得尤为重要。本文分析了教育电子身份认证系统存在的各种安全隐患,从管理和技术两方面提出了保障教育电子身份认证系统安全、稳定运行的安全策略。
The authentication system of educational electronic identity covers various aspects in daily oper-ations of educational application system in which authentication is served by e2ID. Therefore, its security assurance and steady operation are extremely important. This paper analyzes a variety of security risks in the educational electronic identity authentication system, and puts forward safety strategies from both the management and technical measures.
The Classification and Hierarchy of Models for Concurrency
并发模型的分类与层次

,晓聪
计算机科学 , 2000,
Abstract: 随着处理器性能的不断提高和网络技术的迅速发展,越来越多的计算机应用系统涉及并行与分布式计算。开发这类系统远比传统的串行系统困难,这除了并行与分布式计算本身固有的复杂性外,还有一个原因是人们对并发性的实质缺乏真正了解,因而对并发模型进行深入广泛的研究具有重要的现实意义。并发模型是一种描述与解释并发与分布式系统的形式化数学模型,在理论上可提供对并发系统及其行为的深刻理解,在实践中可为并发系统的设计与分析提供指导方法。探讨并发性的语义往往也集中在并发模型的研究,以此作为并发语言与系统的指称结构。
Researches and Advances in Type System
类型系统的研究与进展

晓聪,
计算机科学 , 2000,
Abstract: In recent years,type system is one of the most important research of theotical computer sci-ence. Based on discussing the general concept of type system,this paper outlines the main contents of type system from programming and logical view,and presents the new results in a systematic way.
同时检测O2和CO2的实时动态传感技术研究
仲柏,
科学通报 , 1997,
Abstract: 氧和二氧化碳是两种与生命过程息息相关的共存气体.我们先期研究建立的微电流法,采用非水电解质在气敏微电极和硅一体化薄膜微电极器件上常温直接检测CO2,取得了满意的结果.但是,O2的干扰难以消除.若要连续检测O2和CO2,则必须分次提取两者的响应信号,以致电极结构复杂,测量费时.而且,这类按Clark电极限流原理稳态工作的电化学传感器,其响应速度不可能跟上生物呼吸过程中O2和CO2气体分压的动态变化频率.
二氧化碳和氧气的快速电化学方法联合测定
仲柏,
分析化学 , 1997,
Abstract: 根据O2和CO2在二甲亚砜(DMSO)介质中Pt电极上的伏安特性,采用微电极并结合计算机控制的电位调制技术,建立了快速联合测定CO2和O2的调制电位脉冲库仑法和调制电位脉冲电流法,取得了满意的结果。一次测量时间快达40ms.CO2检测范围0~10%(体积百分比);O2检测范围不受限制。通过编程设计特定的调制电位-时间波形,可保持连续检测的长期稳定性。
H形截面上弦张弦梁体系施工关键问题的研究
齐永胜,赵风华,
工业建筑 , 2009, DOI: 10.13204/j.gyjz200912023
Abstract: H形截面上弦平面张弦梁结构具有制作方便、便于节点连接的优点,但由于H钢截面构件具有平面外刚度较小的特点,对平面外的缺陷非常敏感,在施工过程中若对此没有采取有效措施,结构会发生平面外失稳,以至无法施工。通过有限元方法三维整体建模,对张弦梁施工过程中的预应力张拉和工作阶段的全过程进行模拟及分析,研究该平面体系由于侧向支撑造成的空间效应,经反复比较提出可行的施工方案,指出应当注意的事项,保证了结构的安全施工,可供类似工程参考。
液压缓冲器特性计算与仿真分析
,
农业机械学报 , 2008,
Abstract: 通过对液压缓冲器的薄壁小孔流特性和球面缝隙流特性的分析,建立了液压缓冲器的综合特性模型和缓冲过程的动态模型,并进行了仿真计算,得出了表征缓冲器特性的缓冲力—活塞行程曲线。液压缓冲器的静态特性仅取决于薄壁小孔流的二次特性和球面缝隙流的一次特性,而动态特性与冲击载荷的大小和油液的压缩性密切相关。
Page 1 /231618
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.