全文获取类型
收费全文 | 7380篇 |
免费 | 176篇 |
国内免费 | 1篇 |
专业分类
管理学 | 990篇 |
民族学 | 33篇 |
人口学 | 760篇 |
丛书文集 | 32篇 |
理论方法论 | 661篇 |
综合类 | 90篇 |
社会学 | 3581篇 |
统计学 | 1410篇 |
出版年
2023年 | 40篇 |
2020年 | 97篇 |
2019年 | 141篇 |
2018年 | 168篇 |
2017年 | 254篇 |
2016年 | 179篇 |
2015年 | 124篇 |
2014年 | 160篇 |
2013年 | 1301篇 |
2012年 | 228篇 |
2011年 | 206篇 |
2010年 | 147篇 |
2009年 | 134篇 |
2008年 | 147篇 |
2007年 | 141篇 |
2006年 | 171篇 |
2005年 | 152篇 |
2004年 | 148篇 |
2003年 | 136篇 |
2002年 | 153篇 |
2001年 | 164篇 |
2000年 | 170篇 |
1999年 | 173篇 |
1998年 | 137篇 |
1997年 | 133篇 |
1996年 | 126篇 |
1995年 | 110篇 |
1994年 | 107篇 |
1993年 | 110篇 |
1992年 | 116篇 |
1991年 | 128篇 |
1990年 | 125篇 |
1989年 | 144篇 |
1988年 | 85篇 |
1987年 | 109篇 |
1986年 | 93篇 |
1985年 | 114篇 |
1984年 | 96篇 |
1983年 | 103篇 |
1982年 | 80篇 |
1981年 | 81篇 |
1980年 | 76篇 |
1979年 | 81篇 |
1978年 | 83篇 |
1977年 | 60篇 |
1976年 | 66篇 |
1975年 | 61篇 |
1974年 | 59篇 |
1973年 | 48篇 |
1971年 | 41篇 |
排序方式: 共有7557条查询结果,搜索用时 15 毫秒
991.
992.
993.
B C Fletcher 《Human Relations》1983,36(2):123-133
The relationship between a married woman's life expectancy and the occupation of her husband is explored using official data for the United Kingdom for 1959-1963 and 1970-1972. The author notes that not only are there large and specific effects of employees' occupations on life expectancy and mortality rates, but that these mortality differentials also affect the spouses of those in high-risk occupations. It is suggested that such occupational risks are transmitted via the domestic psychological environment to the married women concerned, and thus the males' job risks affect the life expectancy of both partners. 相似文献
994.
The impact of public health insurance on price and output of medical care is analyzed within the context of monopolistic markets for health services. An important result, which is not obtained in competitive markets, is that indemnity benefits cause smaller price increases than service benefits, both directly and indirectly through the effect of benefit structure on the production of information. Various types of price regulation are considered, including limitation to "usual, customary, and prevailing" levels, a frequently used technique. With a simple dynamic model this type of regulation is shown to cause chronic price inflation. 相似文献
995.
996.
In an ordinary linear program a single objective vector is constructed and one attempts to choose a decision vector to optimize this objective. Often multiple criteria exist or exact estimates for the components of a single objective vector are not entirely clear. For these cases a conservative decision-maker may want to choose an alternative that maximizes the objective value under the worst foreseeable circumstances. Herein we develop a unified framework for applying the maximin criterion to problems with various degrees of uncertainty attached to the objective vector. Three cases are solved via linear programming: (1) Complete Information, (2) Partial Information, and (3) Total Ignorance. It is shown that the functional value of the maximin solution decreases in a convex manner with increasing uncertainty. In addition certain relationships between maximin and efficient solutions are provided. Finally, an extension to integer constrained decision variables is presented. 相似文献
997.
998.
天线罩覆盖的波束近轴场 总被引:2,自引:0,他引:2
本文根据复射线法对通过介质天线罩的高斯波束场进行近轴近似分析。实空间的轴向复射线追综大大简化了计算过程,而复相位差、反射-传输系数和曲面扩散系数的进一步校正则提供了相当精确的结果。所得数字结果表明,在波束的近轴区域内为获得同样的计算精度,近轴近似法所需要的计算机时间远小于复射线追综法的时间。 相似文献
999.
B. C. Burrows 《Long Range Planning》1982,15(6):84-99
The considerable amount of published literature on venture management is reviewed in an attempt to see how successful this technique is in promoting new products. It was found that earlier articles were optimistic but later articles were more realistic with several describing failed projects.
An attempt is made to relate this with the published literature on the failure of traditional Research and Development but little published evidence is available. The role of New Towns in innovation is briefly mentioned. Finally the reasons for failure are identified and guidelines are established as a means of making venture groups more successful. 相似文献
1000.