全文获取类型
收费全文 | 9564篇 |
免费 | 163篇 |
专业分类
管理学 | 1412篇 |
民族学 | 52篇 |
人才学 | 1篇 |
人口学 | 953篇 |
丛书文集 | 28篇 |
理论方法论 | 752篇 |
综合类 | 134篇 |
社会学 | 4077篇 |
统计学 | 2318篇 |
出版年
2022年 | 61篇 |
2021年 | 83篇 |
2020年 | 185篇 |
2019年 | 247篇 |
2018年 | 347篇 |
2017年 | 399篇 |
2016年 | 301篇 |
2015年 | 184篇 |
2014年 | 282篇 |
2013年 | 1575篇 |
2012年 | 349篇 |
2011年 | 302篇 |
2010年 | 236篇 |
2009年 | 225篇 |
2008年 | 193篇 |
2007年 | 221篇 |
2006年 | 197篇 |
2005年 | 193篇 |
2004年 | 173篇 |
2003年 | 162篇 |
2002年 | 170篇 |
2001年 | 215篇 |
2000年 | 202篇 |
1999年 | 183篇 |
1998年 | 143篇 |
1997年 | 137篇 |
1996年 | 139篇 |
1995年 | 117篇 |
1994年 | 109篇 |
1993年 | 99篇 |
1992年 | 150篇 |
1991年 | 123篇 |
1990年 | 118篇 |
1989年 | 112篇 |
1988年 | 99篇 |
1987年 | 93篇 |
1986年 | 96篇 |
1985年 | 111篇 |
1984年 | 114篇 |
1983年 | 125篇 |
1982年 | 98篇 |
1981年 | 88篇 |
1980年 | 86篇 |
1979年 | 95篇 |
1978年 | 92篇 |
1977年 | 80篇 |
1976年 | 67篇 |
1975年 | 68篇 |
1974年 | 59篇 |
1973年 | 59篇 |
排序方式: 共有9727条查询结果,搜索用时 15 毫秒
971.
972.
973.
974.
Frank G. Bowe 《Employment relations today》1988,15(2):107-111
975.
This paper describes a simplified optimization algorithm used for the solution of a classical depot location problem as presented in a Greek Manufacturing Company. Algorithms in the literature for this type of problem are based on the assumption of predetermined fixed costs which are independent of the final size of the depots. This assumption is usually far from reality; the size of each depot does not remain constant during the optimization process and so does the associated fixed cost which is variable with the size of the depot. This assumption is relaxed in the proposed algorithm; the associated fixed cost is modified each time a new customer is allocated to a depot thus changing the required depot size. 相似文献
976.
G Schmidt 《Journal of homosexuality》1984,10(3-4):127-140
Using Magnus Hirschfeld (1868-1935) and his Zwischenstufentheorie (theory of intersexual stages) as an example, the problems raised for homosexuals by etiological research into homosexuality are scrutinized. Hirschfeld, one of the most influential sex researchers working in the first part of the century, fully intended his biological theory to support his campaign on behalf of homosexuals' rights. However, the Zwischenstufentheorie and modern variations of it, such as the ideas of the endocrinologist, Günter D?rner, have been converted into strategies for preventing or curing homosexuality. From an historical point of view, it becomes clear that, in a society hostile to homosexuals, the results gained from research into the causes of homosexuality can be used against homosexuals and, in fact, have been. 相似文献
977.
978.
Estimates of extreme winds are essential for engineering design, but in preparing such estimates major statistical issues are encountered. In this case study, the analysts were provided with hourly readings on wind speed, wind direction, and barometric pressure at five Canadian stations for observation periods ranging over several recent decades. Their assignment was to calculate point and interval estimates of 10-, 20-, 50-, and 100-year return values (i.e., upper fractiles) for the wind speeds at these stations. 相似文献
979.
980.