全文获取类型
收费全文 | 3028篇 |
免费 | 170篇 |
国内免费 | 34篇 |
专业分类
财政金融 | 305篇 |
工业经济 | 167篇 |
计划管理 | 1000篇 |
经济学 | 552篇 |
综合类 | 274篇 |
运输经济 | 32篇 |
旅游经济 | 73篇 |
贸易经济 | 439篇 |
农业经济 | 144篇 |
经济概况 | 246篇 |
出版年
2024年 | 11篇 |
2023年 | 75篇 |
2022年 | 61篇 |
2021年 | 107篇 |
2020年 | 129篇 |
2019年 | 106篇 |
2018年 | 84篇 |
2017年 | 80篇 |
2016年 | 93篇 |
2015年 | 112篇 |
2014年 | 202篇 |
2013年 | 296篇 |
2012年 | 180篇 |
2011年 | 271篇 |
2010年 | 187篇 |
2009年 | 191篇 |
2008年 | 187篇 |
2007年 | 170篇 |
2006年 | 174篇 |
2005年 | 120篇 |
2004年 | 88篇 |
2003年 | 70篇 |
2002年 | 59篇 |
2001年 | 39篇 |
2000年 | 34篇 |
1999年 | 25篇 |
1998年 | 13篇 |
1997年 | 14篇 |
1996年 | 13篇 |
1995年 | 3篇 |
1994年 | 7篇 |
1993年 | 8篇 |
1992年 | 4篇 |
1991年 | 5篇 |
1989年 | 1篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1979年 | 1篇 |
排序方式: 共有3232条查询结果,搜索用时 537 毫秒
51.
Benis Egoh Mathieu Rouget Andrew T. Knight Albert S. van Jaarsveld 《Ecological Economics》2007,63(4):714-721
A call has been made for conservation planners to include ecosystem services into their assessments of conservation priority areas. The need to develop an integrated approach to meeting different conservation objectives and a shift in focus towards human wellbeing are some of the motivations behind this call. There is currently no widely accepted approach to planning for ecosystem services. This study contributes towards the development of this approach through a review of conservation assessments and the extent to which they include ecosystem services. Of the 476 conservation assessments identified by a set of search terms on the Web of Science, 100 were randomly selected for this review. Of these only seven had included ecosystem services, while another 13 had referred to ecosystem services as a rationale for conservation without including them in the assessment. The majority of assessments were based on biodiversity pattern data while 19 used data on ecological processes. A total of 11 of these 19 assessments used processes, which could be linked to services. Ecosystem services have witnessed an increase in attention received in conservation assessments since the year 2000, however trends were not apparent beyond this date. In order to assess which types of ecosystem services and how they have been accounted for in conservation assessments, we extended our review to include an additional nine conservation assessments which included ecosystem services. The majority included cultural ecosystem services, followed by regulatory, provisioning and supporting services respectively. We conclude with an analysis of the constraints and opportunities for the integration of ecosystem services into conservation assessments and highlight the urgent need for an appropriate framework for planning for ecosystem services. 相似文献
52.
This paper analyses the political support for a social insurance that includes elements of redistribution when there exists an imperfect private insurance alternative. Individuals differ both in their income and risk. The social insurance is compulsory and charges an income-related contribution with pooling of risks. The private insurance is voluntary and charges a contribution based on individual risks. However due to the adverse selection problem, private insurance companies provide only partial insurance. Adopting a non-expected utility model, we show that there is a general majority support for social insurance and that this support is increasing with risk aversion. We also show that a mixed insurance is politically impossible, regardless of the degree of redistribution of social insurance and the joint distribution of risk and income in the population. Lastly, we analyse how the political support for social insurance is affected by any change in its redistributive component and the possibility of using genetic tests. 相似文献
53.
This paper uses the experimental method to investigate behavior in a coordination game when the information available to subjects
is limited to their feasible choices and their experienced payoffs. In the experiment subjects converge to an absorbing state
at rates that are orders of magnitude faster than reinforcement learning algorithms, but slower than under complete information.
This state is very close to a mutual best response outcome. All cohorts converged to the market statistic predicted by the
interior equilibrium regardless of the information conditions or the stability conditions.
Eric Battalio programmed the graphical user interface. The National Science Foundation and Texas Advanced Research Program
provided financial support. Any opinions, findings, and conclusions or recommendations expressed in this material are those
of the authors and do not necessarily reflect the views of the National Science Foundation or the Texas Advanced Research
Program. 相似文献
54.
随着新经济的到来,知识越来越成为企业快速响应市场机遇和获取竞争优势的最短缺资源.而企业自身知识资源的有限性使企业越来越多地采用虚拟企业的高级形态--知识联盟型虚拟企业来弥补企业知识资源的不足以快速响应变化的市场需求.本文首先对知识联盟型虚拟企业的知识缺口类型进行研究和划分,然后分析并描述虚拟企业生命周期各阶段的知识活动;在此基础之上,探讨虚拟企业组建阶段考虑知识要素的伙伴选择过程;最后,针对不同的知识缺口,提出伙伴选择过程的评价指标体系设计中应考虑的知识性因素. 相似文献
55.
遗传模拟退火算法在配送中心选址中的应用 总被引:4,自引:0,他引:4
物流配送中心是现代物流系统的枢纽,而配送中心地址的确定是物流系统分析的核心内容.合理的配送中心选址可以降低企业的运营成本,本文根据配送中心地址问题的特点和要求,提出用遗传模拟退火算法解决选址模型.最后通过一个实例求得了模型的最优解,验证了该算法的有效性. 相似文献
56.
Constantinos S. Hilas Author Vitae Sotirios K. Goudos Author Vitae John N. Sahalos Author Vitae 《Technological Forecasting and Social Change》2006,73(5):495-509
In this paper, forecasting models for the monthly outgoing telephone calls in a University Campus are presented. The data have been separated in the categories of international and national calls as well as calls to mobile phones. The total number of calls has also been analyzed. Three different methods, namely the Seasonal Decomposition, Exponential Smoothing Method and SARIMA Method, have been used. Forecasts with 95% confidence intervals were calculated for each method and compared with the actual data. The outcome of this work can be used to predict future demands for the telecommunications network of the University. 相似文献
57.
Suduan Chen 《Applied economics》2019,51(31):3376-3388
The purpose of this study is to construct a two-stage effective and innovative going concern prediction model to predict going concern doubt for the sustainability of enterprises and capital market development. Samples of this study are the companies listed on the Taiwan Stock Exchange or the Taipei Exchange, totalling 196 companies and including 49 companies with going concern doubt and 147 normal companies (with no going concern doubt). The data are taken from the Taiwan Economic Journal (TEJ) and the Market Observation Post System during the period from 2001 to 2016 (totalling 16 years). This study adopts a two-stage way to construct the going concern prediction models. In Stage I, the traditional statistical method of stepwise regression (SR) and the data mining technique artificial neural network (ANN) are applied to select the important variables. In Stage II, two decision tree algorithms (data mining techniques): classification and regression tree (CART) and C5.0 are used to establish the prediction models. The results show that the SR + CART model has the highest going concern prediction accuracy, with an overall accuracy of 87.42%. 相似文献
58.
利率市场化中的风险转移与商业银行风险规避 总被引:1,自引:0,他引:1
利率市场化通过对利率管制下扭曲利率的校正 ,实现了资源的有效配置 ,促进了经济增长。然而利率市场化以后 ,基准利率的确定、利率的波动趋势以及外资金融机构的进入 ,将使商业银行面临风险转嫁的可能。商业银行必须适时建立起完善的风险防范和风险管理制度。 相似文献
59.
60.
地区综合实力的ANN分析 总被引:11,自引:0,他引:11
人工神经网络通过神经元之间的相互作用来完成整个网络的信息处理,具有自学习和自适应等一系列优点,因而用它来评价地区综合实力是可行的。针对地区综合实力评价问题,建立了基于神经网络的评价系统,给出了应用实例。 相似文献