全文获取类型
收费全文 | 48852篇 |
免费 | 737篇 |
专业分类
财政金融 | 8556篇 |
工业经济 | 3143篇 |
计划管理 | 7910篇 |
经济学 | 11112篇 |
综合类 | 794篇 |
运输经济 | 218篇 |
旅游经济 | 547篇 |
贸易经济 | 9326篇 |
农业经济 | 1572篇 |
经济概况 | 5747篇 |
信息产业经济 | 45篇 |
邮电经济 | 619篇 |
出版年
2021年 | 181篇 |
2020年 | 309篇 |
2019年 | 430篇 |
2018年 | 2825篇 |
2017年 | 2610篇 |
2016年 | 1775篇 |
2015年 | 502篇 |
2014年 | 750篇 |
2013年 | 3316篇 |
2012年 | 1304篇 |
2011年 | 2810篇 |
2010年 | 2486篇 |
2009年 | 2331篇 |
2008年 | 2374篇 |
2007年 | 2629篇 |
2006年 | 863篇 |
2005年 | 1102篇 |
2004年 | 1195篇 |
2003年 | 1303篇 |
2002年 | 937篇 |
2001年 | 742篇 |
2000年 | 723篇 |
1999年 | 595篇 |
1998年 | 606篇 |
1997年 | 563篇 |
1996年 | 574篇 |
1995年 | 502篇 |
1994年 | 557篇 |
1993年 | 548篇 |
1992年 | 533篇 |
1991年 | 552篇 |
1990年 | 510篇 |
1989年 | 434篇 |
1988年 | 426篇 |
1987年 | 429篇 |
1986年 | 457篇 |
1985年 | 649篇 |
1984年 | 596篇 |
1983年 | 599篇 |
1982年 | 591篇 |
1981年 | 505篇 |
1980年 | 495篇 |
1979年 | 502篇 |
1978年 | 440篇 |
1977年 | 397篇 |
1976年 | 322篇 |
1975年 | 309篇 |
1974年 | 286篇 |
1973年 | 269篇 |
1972年 | 211篇 |
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
71.
The American Psychological Association Task Force recommended that researchers always report and interpret effect sizes for quantitative data. However, no such recommendation was made for qualitative data. Thus, the first objective of the present paper is to provide a rationale for reporting and interpreting effect sizes in qualitative research. Arguments are presented that effect sizes enhance the process of verstehen/hermeneutics advocated by interpretive researchers. The second objective of this paper is to provide a typology of effect sizes in qualitative research. Examples are given illustrating various applications of effect sizes. For instance, when conducting typological analyses, qualitative analysts only identify emergent themes; yet, these themes can be quantitized to ascertain the hierarchical structure of emergent themes. The final objective is to illustrate how inferential statistics can be utilized in qualitative data analyses. This can be accomplished by treating words arising from individuals, or observations emerging from a particular setting, as sample units of data that represent the total number of words/observations existing from that sample member/context. Heuristic examples are provided to demonstrate how inferential statistics can be used to provide more complex levels of verstehen than is presently undertaken in qualitative research. 相似文献
72.
73.
Eric F. Parkinson 《International Journal of Technology and Design Education》2004,14(3):219-243
Construction kits have played a significant part in nurturing the growth and development of the minds and manipulation-based
skills of children (and adults) in formal and non-formal education settings. These kits have origins rooted in the representation
of the built world and now have a diversity of form and function, including technical versions with moving parts. This article
examines some of the historically based ideas that lie behind the role that kits may have in terms of physical modelling.
The article traces the transformation of kits from simple bricks and blocks into more complicated pieces for space-filling
and achieving the transfer of forces and motion. This transformation occurred during the Victorian era when the influence
of the ideas of educationalists and, perhaps rather strangely, exponents of early aviation, played major roles in determining
the diversity of forms of construction kit and modelled possibilities that are now to be seen in classrooms and homes. The
article ends with a review of some of the lessons from the past and present that will need to be considered in relation to
concrete modelling in schools for the future.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
74.
75.
76.
Using the agency and institutional perspectives, this study advances several hypotheses about the board structure–firm performance relationship within Russia. We tested these hypotheses using survey data. Despite a relatively small sample size, predictions from both theoretical perspectives were supported. Specifically, we found a negative relationship between “informal” CEO duality and firm performance. This finding is noteworthy given the 1996 Russian Federal law which prohibits the CEO from also serving as board chair. Also, we found that the more vigorously the firm pursues a retrenchment strategy, the more negative the relationship between proportion of inside directors and firm performance. Overall, these findings suggest that effective corporate governance may be essential to firm performance in Russia. 相似文献
77.
Calvyn Potgieter 《International Journal of Technology and Design Education》2004,14(3):205-218
In this article the impact of technology education, as a new learning area (subject) in the curriculum, on in-service teacher
education in South Africa is described in order to ascertain the extent of the impact. The research on which this article
is based draws on a variety of experiences and observations in the field at grassroots level (in particular an outreach project
in rural communities). The envisaged impact of technology education on South African schools, communities, teacher educators
and teachers, the range of in-service teacher education that is required, and the impacts in urban and rural areas are discussed.
Finally a number of concluding remarks are made about the extent of the impact of the inclusion of technology education in
the new National Curriculum Statement and whether the situation has changed since the implementation of a pilot technology
education project in 1998.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
78.
79.
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
80.