全文获取类型
收费全文 | 107946篇 |
免费 | 4094篇 |
国内免费 | 2384篇 |
专业分类
财政金融 | 7383篇 |
工业经济 | 4692篇 |
计划管理 | 25688篇 |
经济学 | 13044篇 |
综合类 | 12000篇 |
运输经济 | 1079篇 |
旅游经济 | 2139篇 |
贸易经济 | 11042篇 |
农业经济 | 6782篇 |
经济概况 | 9964篇 |
水利工程 | 20610篇 |
信息产业经济 | 1篇 |
出版年
2024年 | 311篇 |
2023年 | 1224篇 |
2022年 | 1764篇 |
2021年 | 2897篇 |
2020年 | 3343篇 |
2019年 | 2369篇 |
2018年 | 2216篇 |
2017年 | 2727篇 |
2016年 | 3072篇 |
2015年 | 3381篇 |
2014年 | 7901篇 |
2013年 | 8816篇 |
2012年 | 9010篇 |
2011年 | 10952篇 |
2010年 | 7931篇 |
2009年 | 6842篇 |
2008年 | 7112篇 |
2007年 | 6550篇 |
2006年 | 6127篇 |
2005年 | 4814篇 |
2004年 | 3543篇 |
2003年 | 2806篇 |
2002年 | 1988篇 |
2001年 | 1718篇 |
2000年 | 1280篇 |
1999年 | 806篇 |
1998年 | 548篇 |
1997年 | 458篇 |
1996年 | 384篇 |
1995年 | 290篇 |
1994年 | 258篇 |
1993年 | 196篇 |
1992年 | 163篇 |
1991年 | 96篇 |
1990年 | 49篇 |
1989年 | 79篇 |
1988年 | 46篇 |
1987年 | 19篇 |
1986年 | 13篇 |
1985年 | 62篇 |
1984年 | 92篇 |
1983年 | 69篇 |
1982年 | 44篇 |
1981年 | 15篇 |
1980年 | 20篇 |
1979年 | 13篇 |
1978年 | 3篇 |
1977年 | 6篇 |
1973年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
为检查工程质量,查找输水系统可能存在的问题并消除隐患,保障电站安全运行,福建仙游抽水蓄能电站在投产发电前,要对输水发电系统进行充水试验与放空排水试验,在试验过程中监测输水系统的应力、应变与渗漏水情况。本文以尾水系统为例,介绍了试验所应具备的工程条件、工作程序及技术要求、试验成果分析和存在问题处理等。试验表明,仙游抽水蓄能电站尾水系统设计合理,施工质量优良,结构可靠,可供同类工程参考与借鉴。 相似文献
2.
文章通过对黑龙江省高效节水现状,存在问题的分析,结合黑龙江省高效节水发展的支撑能力,阐述黑龙江省节水增粮目标、任务及总体布局,为黑龙江省2012—2015年节水增粮实施提供依据。 相似文献
3.
We characterize the individual's attitude towards risk, prudence and temperance in the gain and loss domains. We analyze the links between the three features of preferences for a given domain and between domains for each feature of preferences. Consequently, the reflection effect, the mixed risk aversion and the risk apportionment, are key concepts of our study. We also display some determinants for risk aversion, prudence and temperance in each domain. To do this, we conducted a lab experiment with students eliciting risk aversion, prudence and temperance in the two domains, and collected information about each subject's characteristics. 相似文献
4.
Nicoleta Iliescu 《Applied economics letters》2019,26(5):387-395
In this article, we investigate the existence of long-run common trends between imports and remittances in 11 Central and Eastern European countries which are part of the European Union. Using the Engle–Granger two-step procedure, we determine that for all countries in our sample there are no long-run common trends (no cointegration) between imports and remittances. However, the results are mixed when running a Granger causality test. For nine countries, we can establish either a bidirectional or unidirectional Granger causality, indicating that past values of one variable have predictive content on the other variable. In two countries, there is no Granger causality between imports and remittances. 相似文献
5.
Are poor macroeconomic outcomes primarily the result of economic policies, or of deeper underlying state fragility problems in sub‐Saharan Africa? We attempt to answer this question by using carefully specified dynamic panel regression techniques to show how state fragility conditions help to explain the differences in the macroeconomic performance of sub‐Saharan African economies, and to identify the most plausible mechanisms of transmission. We find that countries with greater fragility suffer higher macroeconomic volatility and crisis; they also experience weaker growth. When we disaggregate state fragility into its various components, we find that it is the security and social components that have the strongest causal impact on macroeconomic outcomes, while the political component is, at best, weak. Therefore, we conclude that it is state fragility conditions, and not necessarily macroeconomic policies, that are of first‐order importance in explaining the differences in macroeconomic performance for African countries. The knock‐on effects are mostly mediated through the fiscal channel, the aid channel, and the finance channel. Accordingly, we recommend that interventions in fragile states should best focus on exploiting the potential for using fiscal policy, aid, and finance as instruments to improve macroeconomic outcomes in sub‐Saharan Africa. 相似文献
6.
Catapults(弹射中心)作为一种新型研发组织形式,在英国创新发展战略的实施中扮演着重要角色。精准的组织功能定位、高效的组织管理运作模式和紧密的网络化组织关系,是Catapults组织管理模式创新的重要三大重要内容。为我国新型研发机构的培育和发展提供了良好的参考样本。 相似文献
7.
Advocates of public‐private partnerships (PPPs) argue that they can deliver public infrastructure more efficiently than traditional procurement through timelier completion and superior value for money. Despite these claims comparative analysis of the performance of both procurement methods has received scant attention in the PPP literature to date. This paper addresses this issue by providing an in‐depth, case‐based comparison of PPP versus traditional procurement in the schools sector in Ireland. Through detailed semi‐structured interviews with key stakeholders and an examination of the available documentation, we assess whether the key objectives of using PPP have been achieved. Overall, we find no evidence that PPP leads to faster delivery of infrastructure when the overall procurement process from contract notice to delivery is accounted for. In addition, we find only limited evidence to suggest that PPP results in better value for money. 相似文献
8.
9.
根据某面板堆石坝施工期、蓄水初期以及几年来的沉降观测资料,对坝体填筑材料计算参数进行反馈分析,得出了能够反映坝体实际变形的弹塑性应力变形计算参数,有利于今后建立大坝变形预报模型,更准确地把握大坝实时运行状态。 相似文献
10.
Synopsis In contrast to the neoclassical economic presumption in favor of markets, we argue that organizations, not markets should be taken as our default assumption. We do so on information processing grounds. We distinguish between Zen and market Knowledge. The first is embodied and hard to articulate and the second abstract-symbolic. In human evolution, the first type of knowledge came first, and, on any pragmatic definition of knowledge, it still incorporates most of what we mean by the term. We take codification and abstraction as the two data processing activities that lead to the articulation of knowledge into an abstract-symbolic form. We develop a conceptual framework, the Information-Space (I-Space) to show how far the articulation of knowledge leads to its being shared. Whereas an unlimited sharing of information and knowledge leads to market-oriented outcomes, a more limited sharing leads to organizational outcomes. A market-oriented economics has tended to look to physics for its models; the field of organization theory has tended to look to biology. A more organization-oriented economics would thus look more to biology for its models. 相似文献