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   3375篇
  免费   108篇
  国内免费   64篇
财政金融   288篇
工业经济   262篇
计划管理   853篇
经济学   535篇
综合类   607篇
运输经济   23篇
旅游经济   56篇
贸易经济   381篇
农业经济   199篇
经济概况   343篇
  2024年   1篇
  2023年   28篇
  2022年   59篇
  2021年   48篇
  2020年   81篇
  2019年   49篇
  2018年   51篇
  2017年   56篇
  2016年   65篇
  2015年   76篇
  2014年   184篇
  2013年   218篇
  2012年   250篇
  2011年   338篇
  2010年   251篇
  2009年   237篇
  2008年   282篇
  2007年   242篇
  2006年   267篇
  2005年   182篇
  2004年   150篇
  2003年   99篇
  2002年   90篇
  2001年   67篇
  2000年   48篇
  1999年   34篇
  1998年   28篇
  1997年   22篇
  1996年   20篇
  1995年   6篇
  1994年   2篇
  1993年   2篇
  1992年   4篇
  1990年   4篇
  1989年   1篇
  1985年   1篇
  1983年   2篇
  1982年   2篇
排序方式: 共有3547条查询结果,搜索用时 15 毫秒
1.
创新程度在资源配置中的作用日趋明显,但目前创新程度常以专利作为测量值。随着标准在产业发展中引导性增强,作为创新重要产出的标准在创新程度提升中的地位日渐凸显。提出一个以标准数据为依据,通过对标准创新程度值的测量,结合国际国内创新程度四分图模型,研究具体领域创新程度提升路径。以信息技术应用领域标准为分析对象,结合国际标准化组织颁布标准和中国标准,确定信息技术在各应用领域创新现状。结果显示:信息技术在办公系统和银行业务两个领域应用的国际国内创新程度都很低,应在完成产业升级后逐渐淘汰;其在健康关怀领域应用的国际发展前景良好但国内创新程度很低,是重点研究领域。随后,对信息技术在健康关怀领域应用的国际和国内标准具体内容进行对比分析,发现中国与国际发展存在差距,并以国际国内创新程度为依据对位于四分图不同区域的信息技术应用领域创新程度提升提出合理建议。  相似文献   
2.
The introduction of automated vehicles (AVs) is a virtual certainty. Much less certain is the timing of their introduction and how rapid the transition to full automation will be. Various governments are already working to facilitate this shift by, for example, amending and elaborating regulations to support the introduction of AVs, or supporting tests in different urban environments. Meanwhile, urban and regional planners and decision-makers are still grappling with the uncertainties and differing opinions about the possible impacts of AVs on land-use changes and location choices, particularly in relation to the space available for vehicles, both moving (i.e. roadspace) and stationary (i.e. parking space). This paper uses a backcasting approach to identify critical policy decisions and measures to be taken before the implementation of AVs, so as to achieve a more desirable, attractive and high-quality city. These policy measures primarily relate to the reuse and reallocation of parking and roadspace. Two strategic decisions are found to be essential to meet the major goals of sustainable and liveable cities: a clear commitment to a shared mobility and the delimitation of Core Attractive Mixed-use Spaces (CAMS). In order to deliver these desired urbanisation patterns, a set of three policy paths, involving eight policy packages, is proposed for the next 20–30 years. This article provides urban and regional decision-makers with examples of interventions that can be implemented beyond and during the implementation of AVs.  相似文献   
3.
基于交易成本理论,在渠道合作情境下,以制造商的合同监督和企业间联合行动为工具测量合同治理的保障功能和协作功能,探讨二者对经销商主动投机行为和被动投机行为的影响差异。通过对512份问卷数据的统计分析,得到以下结论:第一,合同监督有助于抑制经销商的主动投机行为,但对其被动投机行为的影响不显著;第二,企业间联合行动有助于抑制经销商的被动投机行为,但对其主动投机行为的影响不显著;第三,经销商的主动投机行为和被动投机行为均会负向影响合作绩效;第四,经销商的主动投机行为中介合同监督对合作绩效的正向影响,被动投机行为中介企业间联合行动对合作绩效的正向影响。  相似文献   
4.
刘凯 《金融研究》2020,486(12):56-74
本文构建了一个包含美元本位特征的两国模型,在此基础上分析了美国加征关税及引发的贸易摩擦对美国贸易逆差和全球福利的影响,并详细探讨了相关传导机制。在基准模型设定下,美国单方面加征20%关税会使得美国贸易逆差占GDP比重小幅缩小约0.40个百分点,美国长期稳态GDP下降约2.50%,其他国家GDP下降约1.10%,美国居民福利上升约0.60%,其他国家居民福利下降约1.20%。美国单方面加征关税在抑制全球贸易和生产的同时,会通过更加不公平的国际贸易恶化全球福利分配。当其他国家采取报复性措施时,其他国家自身福利并不会进一步恶化,但美国福利会大幅下滑,同时美国贸易逆差相对规模变化不大。贸易摩擦博弈的“囚徒困境”特征在一定程度上能够解释贸易战的发生。削弱美元本位地位能促进国际贸易公平性的提升,进而能减弱贸易摩擦带来的负面影响、提升全球福利水平,并能有效缩窄美国贸易逆差。  相似文献   
5.
In recent years, labor-intensive agricultural products from developing countries have exhibited inferior performance in international trade due to quality and safety incidents, among which pesticide residue is a major issue. Aiming to improve food quality and safety in the context of cooperatives, we introduced three categories of control measures: outcome control, process control and social control. Based on the Pre-Harvest Interval Standard (PHIS), we selected three indices, farmers’ implementation rate of PHIS, absolute distance to PHIS and relative distance to PHIS, to evaluate appropriateness of pesticides use, reduction of pesticide residue and safety improvements of agricultural products. By using random sampling survey data, we empirically analyzed the marginal effects of control measures and their combinations on food quality and safety standards. The empirical results show that implementing process control, namely, unified production standards or supply of unified agricultural inputs, can comprehensively improve farmers’ implementation rate of PHIS, absolute distance and relative distance to PHIS respectively by 34.9%, 3.2 days and 46.0% on average. While the effects of outcome control (safety inspection) and social control (bonus-penalty incentive or training) are restricted to other measures. Therefore, we suggest cooperatives should take farmers’ features, implementation conditions and the effects of control measures into consideration in order to make a sustainable management plan for improving food quality and safety and enhancing competitiveness in international markets.  相似文献   
6.
Using data on a five-minute interval basis, this article analyses the effects of intraday seasonality on volatility transmission between the spot and futures markets of the CAC40, DAX30 and FTSE100. Remarkable differences in the impulse response analysis and in the dynamic and directional measurement of volatility spillovers are encountered depending on whether the intraday periodic component is considered. Thus, the convenience of removing intraday seasonality seems to be critical to reduce the risk of spurious causality when employing high-frequency data in volatility transmission. Moreover, the impact of market microstructure noise seems negligible when using an optimal frequency of observations.  相似文献   
7.
8.
We investigate the role of contract volition and motives for accepting temporary employment in the relationship between precariousness of life and negative psychological symptoms in a sample of 275 Italian temps. Results suggest that the negative effect of contract volition on negative psychological symptoms is partially mediated by precariousness of life. A moderated mediation model shows that specific motives moderate the negative effects of contract volition on precariousness of life, so that when contract volition is higher, workers with weaker motives feel less precarious. This study broadens our understanding of temporary employment outcomes by showing that the negative consequences of precariousness of life seem to be less troublesome among temporary workers with higher contract volition and lower motivation. © 2018 ASAC. Published by John Wiley & Sons, Ltd.  相似文献   
9.
This study proposes a hybrid information approach to predict corporate credit risk. In contrast to the previous literature that debates which credit risk model is the best, we pool information from a diverse set of structural and reduced‐form models to produce a model combination based on credit risk prediction. Compared with each single model, the pooled strategies yield consistently lower average risk prediction errors over time. We also find that while the reduced‐form models contribute more in the pooled strategies for speculative‐grade names and longer maturities, the structural models have higher weights for shorter maturities and investment grade names.  相似文献   
10.
“城市双修”的提出,促进了屋顶绿化的发展。将农业活动引入到校园建筑屋顶空间,增加城市的绿化率和人居空间环境的归属感,发挥积极的社会作用。通过实际案例对屋顶农场的概念、建设要求、设计及意义进行分析和说明。屋顶农场的建设,增加了学生们与大自然的亲密接触,丰富了课外活动,引导了学生们的自主学习和创新能力,还解决了生活中师生对部分食品的需求。通过案例研究,以期对城市建筑屋顶农场的推广有一定的促进作用。  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