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   3424篇
  免费   71篇
  国内免费   6篇
财政金融   185篇
工业经济   210篇
计划管理   403篇
经济学   1512篇
综合类   133篇
运输经济   28篇
旅游经济   53篇
贸易经济   524篇
农业经济   211篇
经济概况   242篇
  2024年   6篇
  2023年   71篇
  2022年   137篇
  2021年   135篇
  2020年   179篇
  2019年   158篇
  2018年   134篇
  2017年   166篇
  2016年   182篇
  2015年   105篇
  2014年   173篇
  2013年   253篇
  2012年   209篇
  2011年   299篇
  2010年   162篇
  2009年   198篇
  2008年   184篇
  2007年   151篇
  2006年   108篇
  2005年   93篇
  2004年   55篇
  2003年   64篇
  2002年   32篇
  2001年   20篇
  2000年   19篇
  1999年   23篇
  1998年   45篇
  1997年   30篇
  1996年   13篇
  1995年   5篇
  1994年   11篇
  1993年   10篇
  1992年   5篇
  1991年   9篇
  1990年   6篇
  1989年   6篇
  1988年   2篇
  1987年   2篇
  1986年   1篇
  1985年   7篇
  1984年   20篇
  1983年   6篇
  1982年   1篇
  1981年   1篇
  1980年   1篇
  1979年   1篇
  1978年   1篇
  1977年   2篇
排序方式: 共有3501条查询结果,搜索用时 31 毫秒
71.
This paper presents a comparative case study of academic group leaders, active in three different scientific fields at a leading Swiss technical university. It examines the obstacles that prevent scientists from commercializing their technologies and how they can be reduced. Traditional models of technology transfer assume that scientists prefer either to 'go it alone' and become entrepreneurs (the inventor entrepreneur model) or to let go of their technologies to people interested in their commercialization (the surrogate entrepreneur model). The results of qualitative research suggest that these two models capture the extremes of a continuum populated by a variety of intermediate situations where scientists are unwilling completely to let go of their findings, but also do not want to become full time entrepreneurs. This results in considerable commercial potential that is unexploited. The Founding Angels approach might be a solution to this problem; it is designed for academics in these intermediate situations. The study contributes to the literature on university-industry technology transfer and should be useful for practitioners and scientists interested in maximizing the synergies between academia and industry.  相似文献   
72.
The study employed two theories, the technology acceptance model (TAM) and the Attention-Interest-Desire-Action (AIDA) model, to provide an understanding of the process of consumers accepting an on-demand food-delivery app, and to establish the effect of marketing communication on outcomes related to consumer behavior. A conceptual model and hypotheses were developed by combining the key constructs of the two models to predict behavioral intentions. Findings revealed the attention and interest in the AIDA model related strongly to the salient behavioral beliefs of TAM, perceived usefulness and perceived ease of use. Thus, it can be concluded that marketing communication acts as an external element in the process of accepting new innovations. Besides, it was confirmed that attitude towards the adoption of new technology acts as a mediator that promotes desire for the app. From the disciplines of information system and marketing communication, the study suggests an innovative approach to incorporating models.  相似文献   
73.
战明华  李欢 《金融研究》2018,455(5):20-36
本文利用SVAR模型脉冲偏导分离技术,从利率市场化和影子银行两个维度测算了金融市场化进程对货币政策不同传导渠道相对地位的影响。实证结果揭示了中国货币政策传导的一些重要特征:第一,以信贷渠道为代表的数量化渠道效应要强于以利率和汇率渠道为代表的价格渠道,并且该结果没有因金融市场化的推进而改变。第二,利率市场化的推进主要强化了利率渠道的作用,但一定程度上弱化了其他渠道尤其是信贷渠道的作用。第三,影子银行的发展,强化了资产价格渠道的效应,而相对弱化了信贷渠道和利率渠道的效应。研究为在金融与实体经济市场仍存在一定程度摩擦的条件下,央行采用价格与数量货币政策调控方式有机结合的必要性与有效性,提供了实证支持。同时研究还表明,要充分发挥利率市场化改革完善货币政策价格传导机制的作用,既需要加强对各种形式金融创新的监管,还需要实体经济体系进一步市场化改革相配合。  相似文献   
74.
While it is often recognised that agricultural technology adoption decisions are intertwined and best characterised by multivariate models, typical approaches to examining adoption and impacts of agricultural technology have focused on single technology adoption choice and ignored interdependence among technologies. We examine farm‐ and market‐level impacts of multiple technology adoption choices using comprehensive household survey data collected in 2010/11 and 2012/13 in Ethiopia. Economic surplus analysis combined with panel data switching endogenous regression models are used to compute the supply shift parameter (K‐shift parameter), while at the same time controlling for the endogeneity inherent in agricultural technology adoption among farmers. We find that our improved technology set choices have significant impacts on farm‐level maize yield and maize production costs, where the greatest effect appears to be generated when various technologies are combined. The change in maize yield and production costs results in an average 26.4% cost reduction per kilogram of maize output (the K‐shift parameter). This increases the producer and consumer surpluses by US$ 140 and US$ 105 million per annum, respectively. These changes in economic surplus help to reduce the number of poor people by an estimated 788 thousand per year. We conclude that deliberate extension efforts and other policies that encourage integration of technologies are important for maize technologies to yield their full potential at both farm and market levels.  相似文献   
75.
Crop management innovations are often not discrete fixed stand‐alone options—and their adoption may imply various combinations and adaptations. This potentially confounds their impact assessment. This article assesses the resource saving and productivity enhancing impacts of a crop management package revolving around minimum tillage in maize‐based farming systems in northwest Ethiopia. An endogenous switching regression model was applied to plot‐ and household‐level survey data collected from 290 rural households operating 590 maize plots during the 2012 production year. Controlling for variations in plot and household characteristics, the average effect of minimum tillage package (minimum tillage package) on maize productivity is 0.44 t/ha. Compared to conventional practice (CP), adoption of the MTP decreased the average male and female labor use in maize production by 14.4 and 8.2 person‐days per ha, respectively. Similarly, MTP adoption decreased draft power use for land preparation by 13.2 pair of oxen‐days per ha. Compared to CP, in general, there is a considerable short‐run maize productivity gain and reduction in labor and draft power use under MTP.  相似文献   
76.
This study assesses the level of sophistication of livestock products in Africa by evaluating technology intensity and economic complexity of each product. Using trade data from 1995 to 2012, livestock commodity exports are classified based on technology intensity. Employing a method of reflection in computing the economic complexity of export products, we find that one fifth of African livestock commodity exports are manufactured with low technology while the rest is composed of raw materials. The results also show that the ten most complex livestock commodities represent about a third of African livestock total exports while the world level is almost double this figure. Yet African countries spend a huge share of their wealth on importing complex products. The results imply that by exporting non-complex products Africa loses nearly a third of the total value of its livestock exports. To boost the value of livestock products, African countries should exploit their untapped potential while securing the domestic market to achieve import substitution. This can be done by integrating with global value chains or developing niche markets at the regional or international markets and improving productive capabilities.  相似文献   
77.
基于2009—2017年中国内地31个省域面板数据,利用空间计量模型分析科技创新驱动经济高质量发展的时空差异,认为中国经济高质量发展指数稳步上升,空间聚集及正向溢出效应显著,空间依赖性强。R&D投入强度、科技研发成果、万人高校在校人数及城镇化率对经济高质量发展的影响均为正,财政教育支出的影响为负;经济地理距离相近省份R&D投入强度、财政教育支出及城镇化率对本省经济高质量发展的影响均为正,科技研发成果、万人高校在校人数及互联网基础条件的影响均为负。西部及中部地区科技创新人力与科技财政支出要素对经济高质量发展的积极影响大于其它地区,而东部地区科技资金投入、科技研发成果及科技成果转化度要素对经济高质量发展的积极影响大于其它地区。  相似文献   
78.
夏春秋 《价值工程》2014,(14):307-308
文章对成都理工大学6个教职工体育协会的建制、经费、场地设施、指导人员以及活动开展状况等方面进行了调查访谈,发现协会中仍然存在着协会成员固化、成员覆盖面小以及资金不足、场地匮乏等问题,并提出加大宣传力度,狠抓培训、扩大会员人数;扩展资金来源,寻求学校场地人力支持以及多层次创造活动交流平台等建议措施,以促进成都理工大学教职工体育协会的进一步发展。  相似文献   
79.
Green and organic markets have grown rapidly in recent times, thanks to the increasing global popularity of having a healthier lifestyle. Rising consumer awareness of the risks of synthetic chemicals for humans as well as the environment have boosted the demand for organic personal care products (PCPs). To better understand the micro-mechanisms guiding the organic PCPs buying process, this study builds on the social proof theory by examining the drivers leading this process in two different national contexts. Partial least squares structural equation modelling was used to conduct a multigroup analysis on a sample of 473 consumers (n = 266 from Spain, n = 207 from Italy). Findings reveal the significant role of environmental value, product knowledge, convenience & quality, and information adoption. Furthermore, the study introduces and validates the new construct ‘social reassurance’ explaining the psychological mechanisms leading the organic PCPs buying process.  相似文献   
80.
Academic research suggests a number of technology evaluation models. To ensure effective use, models need to be improved in accordance with changing internal and external environments. However, a majority of previous studies focus on model development, while a few emphasize their implementation or improvement. To fill this research gap, this study suggests a systematic approach to examining the validity of technology evaluation models and improving them. We consider three propositions as criteria for improvement: 1) the coherence of the evaluation results with the evaluation purpose, 2) the appropriateness of the evaluation methods, and 3) the concreteness of the evaluation model. Rather than using expert opinions, this study takes a data-driven approach, wherein we analyze actual evaluation results and determine whether the model produces the intended results. A case study of 291 technology evaluation results, all made by the South Korean government in support of technology-based small and medium-sized enterprises, is conducted to verify the suggested approach's applicability. This is one of the few studies to address issues regarding improvements to a technology evaluation model. Its approach can help to develop and continuously improve a valid technology evaluation model, thus leading to more effective practice.  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