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   37498篇
  免费   1241篇
  国内免费   806篇
财政金融   1545篇
工业经济   1810篇
计划管理   7951篇
经济学   6735篇
综合类   5855篇
运输经济   372篇
旅游经济   818篇
贸易经济   4954篇
农业经济   3803篇
经济概况   5702篇
  2024年   95篇
  2023年   424篇
  2022年   631篇
  2021年   901篇
  2020年   956篇
  2019年   603篇
  2018年   565篇
  2017年   756篇
  2016年   816篇
  2015年   947篇
  2014年   2350篇
  2013年   2712篇
  2012年   3143篇
  2011年   4022篇
  2010年   3174篇
  2009年   2693篇
  2008年   2996篇
  2007年   2599篇
  2006年   2528篇
  2005年   1757篇
  2004年   1277篇
  2003年   977篇
  2002年   656篇
  2001年   724篇
  2000年   454篇
  1999年   259篇
  1998年   122篇
  1997年   88篇
  1996年   58篇
  1995年   74篇
  1994年   28篇
  1993年   36篇
  1992年   20篇
  1991年   12篇
  1990年   2篇
  1988年   5篇
  1987年   4篇
  1986年   2篇
  1985年   11篇
  1984年   20篇
  1983年   14篇
  1982年   17篇
  1981年   6篇
  1980年   5篇
  1979年   4篇
  1978年   2篇
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
941.
利用演化博弈模型分析处在竞争的两类制造企业(在位企业和进入企业)的环保技术创新策略问题,考量以环境保护税为主体的环保规制如何科学设置才能更好地促进制造业企业的环保创新.研究发现:创新效应和市场需求均影响企业创新策略演化的均衡结果,并在两阶段博弈分析的基础上,得出市场需求和创新效应共同作用下两类制造企业的生产策略选择方案.因此,环境保护税的改革与实施应注意掌握好时点,税率的设置应充分考虑不同行业环保创新效应和产品市场需求,进行区别化的、动态的税率设置,并加大其他税种对环境保护税的支持.  相似文献   
942.
Suzuki [Automatica, 2016, 67, 33–45] solves the optimal, finitely iterative, three-regime switching problem for investing in a mean-reverting asset that follows an Ornstein–Uhlenbeck price process and find explicit solutions. The remarkable feature of this model is that the investor can explicitly take either a long, short or square position and can switch the position, with transaction costs, during the investment period. We run empirical simulations of such multiple-regime switching models. There are very few such attempts in the existing literature because it is difficult to find, first, an explicit solution to the problem and second, appropriate financial assets that follow the artificial stochastic process required by the mathematical model. According to the Monte Carlo simulations of the optimal pair-trading strategy, the mean daily Sharp ratio is more than 2.3, whereas the mean Sharp ratio for the historical simulation of the ‘stub’ pairs (combinations of parent/subsidiary companies) is 0.6886. We believe that the results obtained from performing the empirical simulations are remarkable and consider that the optimal switching strategy of the rigorous mathematical model is applicable to businesses in the real world. For the reference many pseudo-program codes are added, which can help to replicate the optimal trading strategies.  相似文献   
943.
We examine the importance of total factor productivity (TFP) growth in middle-income countries (MICs) based on cross-country panel data for the period of 1975–2014. We find that TFP growth contributed significantly to a country’s upward transition from middle-income to high-income country group. The TFP growth model reveals that the catch-up effect, human capital, smaller population, weak currency, and research and development growth are significant sources of TFP growth. We do not find a systematic difference in the TFP growth models for MICs. In analyzing the role of factors influencing TFP growth at different income stages, strengthening innovative activities and building innovative capacities are important in overcoming the challenges that MICs face when transitioning to the high-income group. Governments of upper MICs need to initiate reform to motivate innovation by optimizing national R&D systems, and redesigning the educational system to target promoting innovation.  相似文献   
944.
ABSTRACT

Infrastructure is commonly conceptualized as a set of facilities that play a critical role in facilitating activities by individuals and organizations. Conventionally, infrastructure is tightly linked to publicly funded projects that facilitate access to key resources and enable diverse activities. Within entrepreneurial clusters research, infrastructure includes universities, research institutions and telecommunication technologies that facilitate entrepreneurial activities. These capital-intensive investments seek to facilitate start-ups emergence by aiding access to markets and development of ideas. Accelerators facilitate the same activities and have only recently been conceptualized as start-up infrastructure. This study builds upon this research stream by elaborating on how accelerators can play this meaningful role at the cluster level. Specifically, and by relying on the analysis of empirical evidence from three distinct studies, we uncover how accelerators provide tangible and intangible dimensions of start-up infrastructure to form a positively reinforcing cycle of entrepreneurial activities. Additionally, our findings allow us to push further the idea that start-up infrastructure development can be an endogenous process involving multiple actors within the cluster. Our empirical findings and the theoretical insights derived from them have meaningful implications for the aforementioned literature, as well as start-up practitioners and policymakers linked to the funding of entrepreneurial clusters.  相似文献   
945.
The aim of this paper is to clarify the relationship between companies' sustainable behavior and their financial performance (FP), which has been studied for several years without reaching a consensus on the effect and the direction of it. Hypotheses are tested for an unbalanced sample of 1960 multinational non‐financial listed companies from 25 countries and one administrative region for the period between 2002 and 2010. Due to the use of an international database and the differences among countries, it is possible to observe divergence between institutional settings. For this reason, a corporate governance system (Anglo‐Saxon, Germanic, Latin and Asian) is used as characteristic of the macro‐environment. Results obtained via the generalized method of moments estimator allow us to support the existence of a positive bidirectional relationship between corporate social responsibility and FP, evidencing the existence of a synergistic circle. The use of market value indicated that investors are able to identify economic, social and environmental practices generating a positive effect on FP. These relationships differ between corporate governance systems, due to the specific characteristics of each system. Findings are robust for each sustainable sub‐index (society, human rights, environmental and board). Copyright © 2013 John Wiley & Sons, Ltd and ERP Environment  相似文献   
946.
947.
王继凤 《价值工程》2014,(36):268-269
本文以高职电类专业为例,就高职职业能力体系的建立进行了研究,并分析了实践体系的重要性,提出了一些看法。  相似文献   
948.
Policy makers use financial sector strategies to formulate a holistic policy for the national financial system. This article examines and rates financial sector strategies around the world on how well they formulate development targets, arrangements for systemic risk management, and implementing plans. The strategies are also rated on whether they consider policy trade-offs between financial development and systemic risk management. The rated strategies are then benchmarked against a range of country characteristics. The analysis finds that the scope and quality of national strategies for the financial sector are systematically influenced by several country characteristics. Interestingly, policy trade-offs, particularly between financial development and systemic risk management, are not adequately considered in the strategies.  相似文献   
949.
项目组合是连接战略和项目的桥梁。区别于以往有关项目管理中领导力的研究,针对高管和项目经理两种层次的领导角色,界定了领导力的内涵,从战略视角出发构建了领导力对项目组合绩效的影响作用模型,并运用偏最小二乘法和实证方法对理论模型进行检验。研究结果表明,高管及项目经理的领导力均对项目绩效、组合绩效有积极的影响,但项目绩效对组合绩效的作用并不显著。结论强化了领导力在项目组合管理中的关键作用,为研究组合绩效的提升机制提供了新的思路和方法。  相似文献   
950.
本文就计算机视觉的理论框架进行阐述,对计算机视觉理论框架存在的问题进行分析,提出计算机视觉理论框架的新发展,以确保通过计算机视觉获得的景物信息更加完整。  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