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1.
基于253家浙江省众创空间的微观数据,文章在运用连续距离的测度方法测算众创空间集聚水平的基础上,采用零膨胀负二项回归等方法实证分析众创空间集聚的影响机制。研究发现,众创空间的地理分布存在显著的区域差异,主要分布在杭州和宁波市辖区,选址具有明显的集聚特征。回归结果显示,区域创新能力和生态环境均对众创空间的地理集聚具有促进作用,但两者之间存在明显的替代效应;尽管不能直接促进众创空间的集聚,政策引导与创新能力之间具有较显著的互补效应。据此,文章从培育创新能力和优化创新激励等方面提出了政策建议。 相似文献
2.
韩克强 《中小企业管理与科技》2021,(3)
随着经济社会的全面发展,经济全球化已经成为全新的发展趋势,紧随其后的是后金融危机时代的到来。区块链是一种特定的数据技术,它在安全和便捷方面一直被业内人士所看好。论文围绕区块链技术对小微企业信用认证及融资的作用展开讨论分析,通过讨论分析有助于实现小微企业成功融资,为我国小微企业提供强有力的保障与支撑。 相似文献
3.
跟踪空间邻近目标时,仅依靠运动学信息不足以实现可靠的数据关联,而基于动目标指示器(Moving Target Indicator,MTI)雷达和电子支援措施(Electronic Support Measurement,ESM)的多源异类传感器数据融合可以通过提升数据关联性能达到改善跟踪性能的目的。通过构建基于五种成比例再分配规则(Five Proportional Conflict Redistribution Rules,PCR5)置信度量的数据关联策略,将目标运动学信息和属性信息结合做多特征推理,解决异类传感器数据的不确定性和不一致性;利用Dempster-Shafer(DS)证据理论方法进行属性融合更新,完成属性信息在时间序列上的相干积累,实现空间邻近目标的可靠跟踪。该方法从数据关联和状态估计两方面联合进行改进,通过引入属性信息提升数据关联的正确性,从而提升跟踪性能,实现多源异类信息下的协同跟踪。仿真表明,相比于仅雷达跟踪、雷达和ESM序惯跟踪等方案,该方法可有效提升跟踪精度和关联性能。 相似文献
4.
TIMOTHY CONLEY SILVIA GONÇALVES CHRISTIAN HANSEN 《Journal of Accounting Research》2018,56(4):1139-1203
We review developments in conducting inference for model parameters in the presence of intertemporal and cross‐sectional dependence with an emphasis on panel data applications. We review the use of heteroskedasticity and autocorrelation consistent (HAC) standard error estimators, which include the standard clustered and multiway clustered estimators, and discuss alternative sample‐splitting inference procedures, such as the Fama–Macbeth procedure, within this context. We outline pros and cons of the different procedures. We then illustrate the properties of the discussed procedures within a simulation experiment designed to mimic the type of firm‐level panel data that might be encountered in accounting and finance applications. Our conclusion, based on theoretical properties and simulation performance, is that sample‐splitting procedures with suitably chosen splits are the most likely to deliver robust inferential statements with approximately correct coverage properties in the types of large, heterogeneous panels many researchers are likely to face. 相似文献
5.
This paper examines the aggregation of preferences with a finitely additive measure space of agents. We consider three types of non-dictatorship axioms: non-dictatorship, coalitional non-dictatorship, and atomic non-dictatorship. First, we show that the existence of an atom is a necessary and sufficient condition for the existence of a social welfare function that satisfies weak Pareto, independence of irrelevant alternatives, and coalitional non-dictatorship. Second, we simultaneously impose non-dictatorship and coalitional non-dictatorship, and specify a necessary and sufficient condition for the finitely additive measure that guarantees the compatibility among the axioms. Third, we impose all non-dictatorship axioms and show that the corresponding measure is extremely restricted. 相似文献
6.
本文基于2018—2020年“中国城市生活质量调查”数据,以新冠肺炎疫情为一次准自然实验,利用双重差分法,检验新冠肺炎疫情对消费者信心的影响。研究发现:新冠肺炎疫情在一定程度上降低了消费者信心,但收入较高人群的消费者信心非但没有降低,反而升高了。另外,从政府信息公开角度进行机制检验发现,政府关于新冠肺炎疫情方面的信息公开会在一定程度上缓解疫情对消费者信心的负面影响。因此,应当理性地看待新冠肺炎疫情对消费者信心的影响,针对特定群体制定相应的政策措施;同时,充分利用各种信息公开渠道,缓解疫情对消费者信心的负面影响,提振消费者信心,激发市场活力。 相似文献
7.
《International Journal of Forecasting》2020,36(4):1362-1379
I propose applying the Mixed Data Sampling (MIDAS) framework to forecast Value at Risk (VaR) and Expected shortfall (ES). The new methods exploit the serial dependence on short-horizon returns to directly forecast the tail dynamics of the desired horizon. I perform a comprehensive comparison of out-of-sample VaR and ES forecasts with established models for a wide range of financial assets and backtests. The MIDAS-based models significantly outperform traditional GARCH-based forecasts and alternative conditional quantile specifications, especially in terms of multi-day forecast horizons. My analysis advocates models that feature asymmetric conditional quantiles and the use of the Asymmetric Laplace density to jointly estimate VaR and ES. 相似文献
8.
We study a non-traditional cooperative game where returns from coalitions are nondeterministic. The long-standing concept of core can be generalized to reflect players’ contentment with their allocations. It is now imperative to formalize the restrictions, such as those pertaining to information, on allocations. The latter are also at times more conducive to fractional representations. With probabilistic structures added, nondeterministic returns become random variables, utility functions attain risk-attitude connotations, and the timing of players’ allocation resolutions gains significance. Under various conditions for utility functions, we show how various core concepts of the general game can be related to its traditionally defined auxiliaries. These developments help pave the way for our illustrations, within two distinct settings, that players’ increased risk aversion would promote the formation of the grand coalition. 相似文献
9.
信心是影响产业政策实施效果背后的重要无形因素。本文从“信心效应”的新视角出发,基于2012—2017年中国A股上市公司面板数据,以《中国制造2025》为一项准自然实验,使用双重差分法研究促进创新型产业政策对企业研发创新的影响。研究结果表明:促进创新型产业政策的颁布能够通过“外部信心效应”和“内部信心效应”促进受支持企业研发投入增加;通过与受支持企业自身的营运性信心和社会性信心叠加,信心效应的影响分别出现U型与倒U型的差异;信心效应在促进创新型产业政策对受支持企业研发产出数量和实质性的影响中都发挥了作用。研究结论不仅丰富了相关文献,也为新时期产业政策的制定与实践以及企业行为调整提供了有益的启示。 相似文献
10.
Hanjo Odendaal Monique Reid Johann F. Kirsten 《The South African journal of economics. Suid-afrikaanse tydskrif vir ekonomie》2020,88(4):409-434
In this paper, we consider the feasibility of constructing online sentiment indices, using large amounts of media data, as an alternative to the conventional survey method used to create the consumer confidence index in South Africa. A clustering framework is adopted to provide an indication of possible candidate sentiment indices constructed from a combination of different text sources and dictionaries that best mimic the traditional survey-based consumer confidence index from the South African Bureau for Economic Research (BER). The results conclude that it is possible to create an index using sentiment analysis using online editorial data that does resemble the BER’s consumer confidence index. The different media-based sentiment indices (MSI) show a significant level of correlation and co-movement with the BER’s CCI. Impulse responses and cross-correlation functions indicate that the MSI could potentially lead the survey-based method up to two quarters. Furthermore, Granger-causality tests show that the media-based indices are good predictors of future consumer confidence index values. The results provide motivation for further study on the use of sentiment-based techniques and online media data sources to track consumer confidence within an emerging market such as South Africa. 相似文献