首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   683篇
  免费   99篇
  国内免费   3篇
财政金融   4篇
工业经济   86篇
计划管理   250篇
经济学   36篇
综合类   39篇
运输经济   5篇
旅游经济   6篇
贸易经济   332篇
农业经济   4篇
经济概况   23篇
  2024年   1篇
  2023年   9篇
  2022年   11篇
  2021年   12篇
  2020年   22篇
  2019年   30篇
  2018年   15篇
  2017年   26篇
  2016年   21篇
  2015年   35篇
  2014年   55篇
  2013年   124篇
  2012年   69篇
  2011年   89篇
  2010年   58篇
  2009年   29篇
  2008年   50篇
  2007年   29篇
  2006年   23篇
  2005年   18篇
  2004年   12篇
  2003年   14篇
  2002年   8篇
  2001年   4篇
  2000年   2篇
  1999年   1篇
  1998年   2篇
  1997年   1篇
  1996年   1篇
  1995年   1篇
  1994年   1篇
  1993年   1篇
  1992年   1篇
  1985年   3篇
  1983年   3篇
  1982年   4篇
排序方式: 共有785条查询结果,搜索用时 15 毫秒
101.
IDI保险是工程质量类保险的一种,在国内主要应用于住宅项目。IDI保险需要在工程建设的全过程中进行质量管控和风险评估。常规水准检测、GPS等技术难以满足IDI保险对风险建筑进行大范围、快速、长期监测的需要。光学遥感观测技术是一种可以实现大面积地物监测的遥感观测技术,该技术可以为IDI保险的监测工作提供数据信息支持。论文整理了近几年关于光学遥感观测技术应用于建筑高度监测的文献,对分类法、边缘检测法、阈值法进行介绍和总结,说明光学遥感观测技术在IDI保险行业中有较高的应用价值和广阔的应用前景。  相似文献   
102.
The Philippines has performed creditably well in the past few years. Ensuring better infrastructure and connectivity is crucial in attaining inclusive growth. This will require substantial investments in infrastructure. Various reforms to address the infrastructure lack were implemented but there is scope for more reforms: improving fiscal space, reforming budgetary processes, improving public‐private partnerships (PPPs) and the regulatory environment, and better policy coordination to address problems of connectivity and infrastructure. The Philippines has to continuously improve the governance framework, ensure stability and predictability of policies and regulations. Better coordination among a diverse set of governmental infrastructure bodies, and also between government and the private sector is needed to address infrastructure bottlenecks.  相似文献   
103.
释光仪作为考古和矿物研究仪器,以前激发光源和光子计数均为单色光。笔者研制了1种由计算机控制、激发光源可以选择、被测样品发射光是分频计数的选频光释光断代仪。该仪器通过计算机控制可以成功获得结晶固体的光释光谱图。利用选频光释光进行矿物分析,由于得到了光谱图,所以提高了矿物分析和鉴定的准确度,用该仪器测定年代,结果可以互比。本文介绍了该仪器的特点以及软、硬件的研制。  相似文献   
104.
The pro- and anti-competitive implications of technical compatibility standards are introduced in general terms and then applied to current issues in telecommunications policy. The demand and supply for standards under regulated monopoly and the transition to deregulation and competitive entry create a tradeoff between the traditional goal of achieving positive externalities from interconnection and the alternative goal of providing enhanced service offerings that may involve sacrificing universal connectivity. We argue that this tradeoff has affected the utilization of data communication networks in the U.S. and Europe. In addition, we identify problems of competing interests that complicate the European approach to standards “harmonization” in the case of telecommunications. We conclude by noting that the nature of standards and standard-setting process can have marked effects on the incentives to conduct private research and development.  相似文献   
105.
Satellite communications systems are the outcome of the fusion of big governments, high technology and big business, whose needs they meet. As a major growth sector they are becoming extremely important in economic terms. But satellite communications raise wider issues of the relationships between rich and poor countries and within rich countries. They will crucially influence the location of economic activity and the future prospects for countries in terms of access to information, decision making and income. The article discusses these questions and suggests how Europe might improve its position. It also argues that participation in public policy on satellite communications should be opened to a wider range of parties.  相似文献   
106.
网络编码的基本思想是网络节点不仅参与数据转发,还参与数据处理,可大幅提高网络性能。传统文件传输系统存在文件分发时间的"瓶颈"问题,为此,提出一种在无线Mesh网络中网络编码的简化文件共享模型,采用理论分析和实验仿真的方法,研究节点间的4种合作机制。结果表明,在总分发时间上,基于网络编码转发机制比无网络编码的转发机制平均减少11.67%,显著地降低了文件传输系统的分发时间,从而提高了网络的吞吐量。  相似文献   
107.
Targeting messages to the different segments of a population is necessary to achieve support for policy addressing climate change. Finer segmentation and archetypal prototyping may be advantageous to provide an in-depth understanding of the most politically-salient segments. The research, conducted in Australia, used quantitative analysis to identify subsegments and prototypical respondents, followed by Jungian-style in-depth interviews to reveal the responses of segment representatives to different marketing stimuli. The results suggest that there are challenges in achieving majority support for action against climate change, but there are archetypal words and images that may garner action.  相似文献   
108.
刀学龙  杜桢 《价值工程》2013,(17):186-187
随着无线电行业的高速发展,无线电通信仿真的数据分布的管理也在提升。文章利用基于无线电通信的分布式仿真技术来建立HLA的对抗仿真环境,这是解决无线电通信系统以及对抗仿真和效能评估问题的最佳途径。  相似文献   
109.
We measure whether, in a developing country, existence of a ‘hard’ strategic human resource management (SHRM) strategy developed at high organizational levels or one designed to enhance employee knowledge inputs and thereby promote employer–employee interdependence (EEIN) is a stronger antecedent of direct communication to employees. We use data from a comprehensive survey of HR practices in Mauritius, one of Africa's most open and successful economies. We find that both SHRM and EEIN are antecedents, but that the latter is stronger in public organizations and in smaller and older companies. We conclude that EEIN is a significant analytic category for explaining management practices especially in a historic sense in this and possibly other developing country contexts.  相似文献   
110.
This article presents a hybrid wireless network integration scheme in cloud services-based enterprise information systems (EISs). With the emerging hybrid wireless networks and cloud computing technologies, it is necessary to develop a scheme that can seamlessly integrate these new technologies into existing EISs. By combining the hybrid wireless networks and computing in EIS, a new framework is proposed, which includes frontend layer, middle layer and backend layers connected to IP EISs. Based on a collaborative architecture, cloud services management framework and process diagram are presented. As a key feature, the proposed approach integrates access control functionalities within the hybrid framework that provide users with filtered views on available cloud services based on cloud service access requirements and user security credentials. In future work, we will implement the proposed framework over SwanMesh platform by integrating the UPnP standard into an enterprise information system.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号