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   40488篇
  免费   1498篇
  国内免费   1383篇
财政金融   2441篇
工业经济   2068篇
计划管理   12395篇
经济学   3178篇
综合类   3909篇
运输经济   453篇
旅游经济   832篇
贸易经济   3994篇
农业经济   2117篇
经济概况   2637篇
水利工程   9344篇
信息产业经济   1篇
  2024年   88篇
  2023年   372篇
  2022年   495篇
  2021年   970篇
  2020年   1014篇
  2019年   732篇
  2018年   732篇
  2017年   875篇
  2016年   988篇
  2015年   1229篇
  2014年   3019篇
  2013年   3523篇
  2012年   3362篇
  2011年   4031篇
  2010年   3045篇
  2009年   2444篇
  2008年   2737篇
  2007年   2651篇
  2006年   2569篇
  2005年   2070篇
  2004年   1565篇
  2003年   1216篇
  2002年   839篇
  2001年   677篇
  2000年   509篇
  1999年   344篇
  1998年   260篇
  1997年   194篇
  1996年   179篇
  1995年   155篇
  1994年   129篇
  1993年   84篇
  1992年   64篇
  1991年   43篇
  1990年   32篇
  1989年   42篇
  1988年   23篇
  1987年   6篇
  1986年   4篇
  1985年   13篇
  1984年   16篇
  1983年   17篇
  1982年   4篇
  1981年   2篇
  1980年   5篇
  1978年   1篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
刘艳 《科技和产业》2018,(11):49-52
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   
2.
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   
3.
21世纪 ,企业面临“非连贯性”的新竞争环境 ,需要建立健全企业人才资源开发与管理的机制和相应的策略。本文在分析企业面临的新形势的基础上 ,对当前企业人力资源开发与管理机制进行了分析 ,并进一步提出企业人力资源开发与管理的相应策略 ,即彻底转变和更新人才观念 ;实施战略性人力资源管理 ;建立企业高素质人才资源开发机制等。  相似文献   
4.
为了提高非稳定渗流计算的计算精度 ,通过数学分析得到了水位传导系数随时间变化时 ,一类非稳定渗流井流模型的半解析解 ,并进行了计算比较  相似文献   
5.
We examine the association between abnormal returns and earnings management in the context of price control regulations to test the construct validity of the earnings management model. Abnormal returns are used as a market–based measure, and discretionary accruals are employed to measure earnings management. Our results support the hypotheses that (1) price control regulations affect firms' security prices negatively, (2) firms make income–decreasing discretionary accruals to increase the likelihood of price increase approval, and (3) firms that are affected most negatively by the regulations manage earnings more aggressively. We conclude that the earnings management model we use in this study is capable of predicting opportunistic discretionary accruals.  相似文献   
6.
供应链核心在于实现供应链环节中的信息沟通,数据互换和协同工作,改造和整合企业的业务流程,因此供应链系统模型应该具有动态可重构的特点,系统主体的构成也应反映这种思想,在系统中引入“大规模定制”,“工作流”的新思想和“异构系统兼容”,“通用报表”以及“三层架构应用体系及开发手段”等新技术将使供应链系统更为“敏捷”。  相似文献   
7.
An approach is presented to satisfy the demand for simple criteria, guidelines and models for the preliminary sizing of horizontal subsurface flow (SF) constructed wetland systems. This approach eliminates time-consuming calculations and iterations by providing graphical solutions for wetland system sizing. Therefore, it can be used for the preliminary assessment of new or performance evaluation of existing subsurface flow constructed wetland systems. The validity of this methodology is checked with data from existing systems and is found to be quite satisfactory. This methodology is combined with simple equations predicting the maximum wetland capacity in summer, so as to assist designers in sizing installations in tourist areas with increased summer populations. Furthermore, based on this methodology, a sensitivity analysis is performed of the area requirements for wastewaters of various strengths and various design conditions and performance criteria. The results provide a useful overview to engineers and further simplify the design methodology of new subsurface flow constructed wetland systems.  相似文献   
8.
The purpose of this article is to describe how households in Novgorod the Great, Russia, deal with food provision in everyday life. The study focuses on changes experienced in food provision and consumption in Russian society, in order to illustrate how households respond to the transformation towards a market economy. The study reflects women's perspective on food provision. Students from Novgorod the Great visited 105 households and asked the women in the household to answer a questionnaire. Results from the study show that in order to cope with changes in society related to economic reforms, Russian households had changed both their food consumption and food production patterns. There was no big difference between urban and rural households. Nearly all of the households were self‐sufficient in the provision of vegetables and potatoes. Many households had a ‘dacha’ (plot), where they produced most of what they needed. Among the changes experienced during recent years (i.e. during the end of the 1990s), a decade after perestroika was initiated, households mentioned the rise in food prices and the decrease of income. Households reported that they consumed less fruit and/or meat. Some households also mentioned that the quality of nourishment had decreased, thereby indicating lower general quality, lower nutrition value, or less healthy foodstuffs.  相似文献   
9.
掺气减蚀保护作用的新概念   总被引:8,自引:0,他引:8  
利用针式掺气流速仪测量原型和模型掺气浓度场、流速场,气泡尺寸及其概率分布的研究成果表明,原型水流韦伯数高,形成微小气泡的能力比模型强,气泡上浮慢,接近底部的小尺寸气泡概率及掺气浓度比模型大。初步研究认为:0.2mm或0.5mm以下的微小气泡在掺气减蚀中起着主要作用,可能只要很小掺气浓度即可达到掺气减蚀的效果。因此以小尺寸气泡的掺气浓度,作为判断掺气减蚀保护作用的指标将更为准确。  相似文献   
10.
The results of a comparison of international banks using a three-factor multi-index model and a modified value-at-risk (VaR) analysis indicate that the use of options increases the interest rate beta for all banks, while both interest rate and currency swaps generally reduce risk. The results are the strongest and the most consistent for U.S. dealer banks, followed by European banks, and then Japanese banks. Furthermore, the evidence suggests that the VaR approach to risk management can effectively be used by both domestic as well as international banks, although the results appear to be somewhat sensitive to the regulatory environment in which the bank operates.  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