全文获取类型
| 收费全文 | 611篇 |
| 免费 | 31篇 |
专业分类
| 财政金融 | 44篇 |
| 工业经济 | 39篇 |
| 计划管理 | 203篇 |
| 经济学 | 94篇 |
| 综合类 | 65篇 |
| 运输经济 | 5篇 |
| 旅游经济 | 12篇 |
| 贸易经济 | 77篇 |
| 农业经济 | 34篇 |
| 经济概况 | 69篇 |
出版年
| 2025年 | 5篇 |
| 2024年 | 7篇 |
| 2023年 | 8篇 |
| 2022年 | 19篇 |
| 2021年 | 15篇 |
| 2020年 | 25篇 |
| 2019年 | 20篇 |
| 2018年 | 10篇 |
| 2017年 | 20篇 |
| 2016年 | 14篇 |
| 2015年 | 24篇 |
| 2014年 | 36篇 |
| 2013年 | 47篇 |
| 2012年 | 38篇 |
| 2011年 | 43篇 |
| 2010年 | 31篇 |
| 2009年 | 44篇 |
| 2008年 | 42篇 |
| 2007年 | 46篇 |
| 2006年 | 37篇 |
| 2005年 | 28篇 |
| 2004年 | 11篇 |
| 2003年 | 14篇 |
| 2002年 | 12篇 |
| 2001年 | 10篇 |
| 2000年 | 6篇 |
| 1999年 | 13篇 |
| 1998年 | 3篇 |
| 1997年 | 2篇 |
| 1996年 | 1篇 |
| 1994年 | 2篇 |
| 1993年 | 1篇 |
| 1992年 | 4篇 |
| 1991年 | 3篇 |
| 1989年 | 1篇 |
排序方式： 共有642条查询结果，搜索用时 15 毫秒
21.
Zhenlong Chen 《Metrika》2007,66(2):173-196
The properties of the polar sets are discussed for a real-valued (N, d)-fractional Brownian sheet with Hurst index. Sufficient conditions and necessary conditions for a compact set to be polar
for the fractional Brownian sheet are proved. The infimum of Hausdorff dimensions of its polar sets are also obtained by means
of constructing a Cantor-type set to connect its Hausdorff dimension and capacity.
Research supported by the National Natural Foundation of China (10471148), the Sci-tech Innovation Item for Excellent Young
and Middle-Aged University Teachers of Educational Department of Hubei (200316). 相似文献
22.
23.
This paper analyses factors determining open environmental innovation (EI) and explores the possibility of embracing their tensions to achieve integrated environmental strategic goals. Building on recent literature linking open innovation and EI, the study assumes open EI strategic goals as a multidimensional construct based on the “synergistic and interwoven nature” of four identified enabling factors, that is, partners, knowledge, benefits, and motivations. A fuzzy‐set qualitative comparative analysis (fsQCA) based on Boolean algebra is conducted to analyse a set of 186 European companies operating in the telecommunication and information and communication technology (ICT) service industries. Making important theoretical, managerial, and policy contributions, this paper offers insights into the key factors enabling open EI and the tensional relationships within and between them. In doing so, it captures the non‐linear effects among these factors and the strategic goals related to an open EI strategy. It also suggests how the paradox theory might help in addressing the tensional dilemma of open EI strategy. 相似文献
24.
We introduce an extension of the Mas-Colell bargaining set and construct, by an elaboration on a voting paradox, a superadditive four-person non-transferable utility game whose extended bargaining set is empty. It is shown that this extension constitutes an upper hemicontinuous correspondence. We conclude that the Mas-Colell bargaining set of a non-levelled superadditive NTU game may be empty. 相似文献
25.
本文主要利用粗集理论针对图像分割后的区域形状进行分类研究。依据粗集理论研究离散化数据的特点,考虑类分布信息,采用信息熵理论进行连续条件属性的离散化。在此基础上,利用约简算法剔除冗余属性,获取约简属性,并进一步提取决策规则。最后选取测试样本进行实验分析,结果表明分类是有效的。 相似文献
26.
27.
针对岩滩电厂混流式水轮发电机组机械制动存在的安全隐患,岩滩电厂对水轮发电机组的制动方式进行了改造,采用国内比较成熟的电气制动技术。文章就该电厂机械制动存在的不足及引用电气制动系统的必要性进行了阐述,并对电气制动系统的可靠性设计、制动方式设计、电气制动主接线系统方案的选择、电制动控制系统方案设计等方面的内容作了阐述。 相似文献
28.
XBRL(可扩展商业报告语言)是一种企业信息的电子化沟通语言,它是以W3C制订的XML技术标准为基础,参照企业报告的实际需要所做的技术性延伸。我国财政部已出台相关标准进行推广,但是如何对企业披露的XBRL实例文档进行审计却是亟待解决的问题。本文在传统审计理论的基础上,从我国XBRL实例文档编制特点出发,分析了适用于XBRL实例文档的审计认定框架,提出了不同认定下的具体审计流程,为审计人员鉴证XBRL实例文档的公允性提供参考。 相似文献
29.
旱灾在世界范围内具有普遍性,我国也是一个旱灾频繁的国家。针对建国以来我国旱灾的概况、旱灾的成因、抗旱的措施作一粗浅梳理,认为加大水利建设的投入、采取科学的救灾措施和制定抗旱的预警机制,是提高抗旱能力的当务之急。 相似文献
30.
Jannette van Beek Michel J.J. Handgraaf Gerrit Antonides 《International Journal of Consumer Studies》2017,41(1):54-60
Eating and exercising behaviour are both characterized by immediate and future consequences. Consequently, consideration of these consequences (i.e. time orientation) predicts eating and exercising behaviour. We investigate whether construal level acts as an underlying mechanism of these relations. Students (N = 101) completed measures of consideration of immediate and future consequences (i.e. CFC‐food and CFC‐exercise), construal level, eating and exercising behaviour and preferences. For self‐reported eating and exercising behaviour, only direct effects of consideration of immediate and future consequences were found. For eating preferences, however, there was evidence of an indirect effect through construal level. A stronger tendency to consider future consequences led to a stronger preference for utilitarian (as compared with hedonic) food products through a more abstract construal level. All in all, construal level partially explains the differential relations between consideration of immediate and future consequences and eating and exercising behaviour and preferences. 相似文献