全文获取类型
收费全文 | 11062篇 |
免费 | 307篇 |
国内免费 | 1篇 |
专业分类
管理学 | 1634篇 |
民族学 | 54篇 |
人才学 | 4篇 |
人口学 | 915篇 |
丛书文集 | 48篇 |
理论方法论 | 1027篇 |
综合类 | 161篇 |
社会学 | 5168篇 |
统计学 | 2359篇 |
出版年
2023年 | 71篇 |
2020年 | 171篇 |
2019年 | 255篇 |
2018年 | 246篇 |
2017年 | 355篇 |
2016年 | 261篇 |
2015年 | 220篇 |
2014年 | 264篇 |
2013年 | 1975篇 |
2012年 | 352篇 |
2011年 | 293篇 |
2010年 | 268篇 |
2009年 | 248篇 |
2008年 | 333篇 |
2007年 | 309篇 |
2006年 | 289篇 |
2005年 | 280篇 |
2004年 | 221篇 |
2003年 | 217篇 |
2002年 | 230篇 |
2001年 | 247篇 |
2000年 | 210篇 |
1999年 | 208篇 |
1998年 | 177篇 |
1997年 | 163篇 |
1996年 | 160篇 |
1995年 | 138篇 |
1994年 | 133篇 |
1993年 | 168篇 |
1992年 | 176篇 |
1991年 | 163篇 |
1990年 | 169篇 |
1989年 | 139篇 |
1988年 | 142篇 |
1987年 | 145篇 |
1986年 | 123篇 |
1985年 | 125篇 |
1984年 | 154篇 |
1983年 | 126篇 |
1982年 | 123篇 |
1981年 | 82篇 |
1980年 | 107篇 |
1979年 | 119篇 |
1978年 | 89篇 |
1977年 | 98篇 |
1976年 | 86篇 |
1975年 | 95篇 |
1974年 | 84篇 |
1973年 | 63篇 |
1972年 | 70篇 |
排序方式: 共有10000条查询结果,搜索用时 281 毫秒
11.
12.
13.
H. Küchenhoff 《Statistical Papers》1995,36(1):41-47
The simple logistic regression model with normal measurement error and normal regressor is shown to be identifiable without any extra information about the measurement error. The multiple logistic regression model with more than one regressor variable measured with error is not identifiable. If the covariance matrix of the measurement error is known up to a scalar factor, the model is identified. Further we discuss why in spite of the identifiability the models cannot be estimated in a reasonable way without extra information about the measurement error. 相似文献
14.
15.
Using an increasing returns specification for distribution, an inverted U pattern between the share of distribution in gross domestic product and the level of development is shown to arise. A cross-section time-series data set is constructed and merged with one used to analyze the service sector. In contrast to the rising pattern found for services, an average time-series relation that exhibits an inverted U pattern is established. The empirical results are robust, for example, to choice of functional form and country and time period coverage. A similar pattern is found in the average cross-section (country) relation between distribution and development. 相似文献
16.
17.
18.
Fred P. Piercy Douglas H. Sprenkle Susan H. McDaniel 《Journal of marital and family therapy》1996,22(2):163-179
The authors present three educational approaches designed to demystify the writing process and to support better writing skills among family therapists. One framework is an academic course in professional writing, another is a writing seminar for family therapy and physician trainees within a medical school setting, and the third is a 2-hour continuing education writing workshop for family therapists. Each is replicable within a variety of settings. 相似文献
19.
This paper describes the design optimization of a robot sensor used for locating 3-D objects employing the Taguchi method in a computer simulation scenario. The location information from the sensor is to be utilized to control the movements of an industrial robot in a 'pick-and-place' or assembly operation. The Taguchi method, which is based on the Analysis-of-Variance (ANOVA) approach, is utilized to improve the performance of the sensor over a wider operating range. A review of the Taguchi method is presented along with step-by-step implementation details to identify and optimize the design parameters of the sensor. The method allows us to gauge the impact of various interactions present in the sensor system exclusively and permits us to single out those factors that have a dominant influence on the overall performance of the sensor. The investigation suggests that the Taguchi method is a more structured and efficient approach for achieving a robust design compared with the classical full factorial design approach. 相似文献
20.
Paul Atkinson 《The Sociological review》2005,53(2):380-382