全文获取类型
收费全文 | 42162篇 |
免费 | 1022篇 |
专业分类
财政金融 | 7871篇 |
工业经济 | 3282篇 |
计划管理 | 7099篇 |
经济学 | 9406篇 |
综合类 | 438篇 |
运输经济 | 283篇 |
旅游经济 | 728篇 |
贸易经济 | 6483篇 |
农业经济 | 1970篇 |
经济概况 | 5549篇 |
信息产业经济 | 1篇 |
邮电经济 | 74篇 |
出版年
2021年 | 256篇 |
2020年 | 433篇 |
2019年 | 570篇 |
2018年 | 839篇 |
2017年 | 806篇 |
2016年 | 763篇 |
2015年 | 557篇 |
2014年 | 870篇 |
2013年 | 4203篇 |
2012年 | 1177篇 |
2011年 | 1258篇 |
2010年 | 1069篇 |
2009年 | 1256篇 |
2008年 | 1239篇 |
2007年 | 1087篇 |
2006年 | 1019篇 |
2005年 | 900篇 |
2004年 | 932篇 |
2003年 | 911篇 |
2002年 | 839篇 |
2001年 | 850篇 |
2000年 | 877篇 |
1999年 | 768篇 |
1998年 | 745篇 |
1997年 | 745篇 |
1996年 | 718篇 |
1995年 | 649篇 |
1994年 | 694篇 |
1993年 | 739篇 |
1992年 | 683篇 |
1991年 | 708篇 |
1990年 | 649篇 |
1989年 | 555篇 |
1988年 | 557篇 |
1987年 | 535篇 |
1986年 | 572篇 |
1985年 | 815篇 |
1984年 | 757篇 |
1983年 | 763篇 |
1982年 | 702篇 |
1981年 | 635篇 |
1980年 | 636篇 |
1979年 | 619篇 |
1978年 | 528篇 |
1977年 | 484篇 |
1976年 | 392篇 |
1975年 | 368篇 |
1974年 | 343篇 |
1973年 | 327篇 |
1972年 | 258篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
C. Anthony Di Benedetto 《Journal of Product Innovation Management》2004,21(3):153-153
32.
33.
34.
35.
In this paper we will analyze the relationship between the value and duration moments of a cash flow and movements in the yield curve. We will show that for changes in the yield curve which can be related to tn , the 1st order changes in the net present value of a cash flow are linearly dependent on the n + lth duration moments, and that the 2nd order changes are dependent on the sum of duration moments of order 2 n + 1 and 2 n + 2. We will use this relationship to tilt tracking portfolios so as to protect them against specific changes in the yield curve. 相似文献
36.
Asses prices and investment were unusually weak throughout theindustrial world during the early 1990s. This paper highlightsthis stylized fact, and connects it with another: in most ofthe industrial world, asset markets boomed for several yearsbefore collapsing around 1989. The paper suggests that assetmarket bubbles during the late 1980s may have left the industrialworld with an 'asset market hangover' in the early 1990s, inthe form of sluggish asset markets and investment. Empiricalsupport for this hypothesis is provided based on cross-countrydata for equity and real estate markets in most industrial countries.We suggest that financial market developments not justifiedby fundamentals can substantially affect real activity. 相似文献
37.
38.
The introduction of traffic management schemes has been one response of the National Parks to the problem of ever-increasing car-borne visitors and the consequent damage caused to the rural environment. By reviewing these schemes and by determining and explaining attitudes towards one particular traffic management experiment, the paper aims to deduce lessons for future policy. The analysis, based on two visitor surveys, suggests that the likelihood of success is improved when schemes are integrated, containing both ‘carrot’ and ‘stick’ elements. Since public perceptions are also found to be pivotal to its success, appropriate marketing of a scheme is vital. The paper concludes, however, that to achieve the fundamental objective of greater accessibility with less mobility, a more wide-ranging marketing effort is required intended to engender a sea change in attitude towards both the car and public transport. 相似文献
39.
40.
In many previous rice trade models, the commodity has been regarded as a homogeneous product. However, homogeneity is not an appropriate assumption, given the various types of rice that are traded and consumed. Parameters estimated from these models, therefore, do not reflect the real world market for rice and, hence, may mislead decision makers who use the results for policy evaluation purposes. This study uses an Armington approach to model the world rice trade as a differential good market and to derive trade elasticity parameters. 相似文献