全文获取类型
收费全文 | 971篇 |
免费 | 54篇 |
专业分类
管理学 | 188篇 |
民族学 | 4篇 |
人口学 | 95篇 |
丛书文集 | 9篇 |
理论方法论 | 126篇 |
综合类 | 12篇 |
社会学 | 495篇 |
统计学 | 96篇 |
出版年
2023年 | 16篇 |
2022年 | 9篇 |
2021年 | 11篇 |
2020年 | 30篇 |
2019年 | 40篇 |
2018年 | 31篇 |
2017年 | 43篇 |
2016年 | 46篇 |
2015年 | 27篇 |
2014年 | 25篇 |
2013年 | 136篇 |
2012年 | 31篇 |
2011年 | 42篇 |
2010年 | 41篇 |
2009年 | 33篇 |
2008年 | 34篇 |
2007年 | 27篇 |
2006年 | 22篇 |
2005年 | 21篇 |
2004年 | 25篇 |
2003年 | 20篇 |
2002年 | 27篇 |
2001年 | 23篇 |
2000年 | 10篇 |
1999年 | 21篇 |
1998年 | 17篇 |
1997年 | 9篇 |
1995年 | 6篇 |
1994年 | 9篇 |
1993年 | 10篇 |
1991年 | 7篇 |
1989年 | 5篇 |
1988年 | 8篇 |
1987年 | 8篇 |
1986年 | 5篇 |
1985年 | 12篇 |
1984年 | 5篇 |
1983年 | 10篇 |
1982年 | 10篇 |
1981年 | 5篇 |
1980年 | 6篇 |
1979年 | 8篇 |
1978年 | 8篇 |
1977年 | 8篇 |
1976年 | 12篇 |
1975年 | 10篇 |
1974年 | 9篇 |
1973年 | 9篇 |
1972年 | 5篇 |
1971年 | 5篇 |
排序方式: 共有1025条查询结果,搜索用时 953 毫秒
81.
Benjamin GC 《Physician executive》2001,27(4):61-62
Crafting the budget is an annual process that Congress and the administration use to define the national policy agenda. It is a massive undertaking to decide how more than two trillion dollars is spent by the federal government. Over 20 percent of the budget is used for health care. The budget is a political document that defines the priorities of the federal government and directly influences overall health policy. Its construction deserves to be followed and influenced by physicians to ensure the health of the public. 相似文献
82.
83.
Bernard Gendron Alain Hertz Patrick St-Louis 《Journal of Combinatorial Optimization》2007,13(2):163-178
We consider the problem of orienting the edges of a graph so that the length of a longest path in the resulting digraph is
minimum. As shown by Gallai, Roy and Vitaver, this edge orienting problem is equivalent to finding the chromatic number of
a graph. We study various properties of edge orienting methods in the context of local search for graph coloring. We then
exploit these properties to derive four tabu search algorithms, each based on a different neighborhood. We compare these algorithms
numerically to determine which are the most promising and to give potential research directions. 相似文献
84.
A method for evaluating the robustness of medium term multisite distributed schedule is presented. The method of robustness evaluation is based on steps and tools associated with the conceptual model of a MultiSite Reactive Production Activity Control (MSR-PAC). The MSR-PAC makes it possible to study the sensitivity of the scheduled plans in presence of perturbations. These must be evaluated before being dispatched to the shop-floors. At present, to the best of the authors' knowledge, there is no means to make this evaluation in the distributed systems such as extended enterprise. The monitoring of errors is based on the discrepancy between the two flow-shape functions that model respectively the dynamics of the scheduled manufacturing orders and the state of the perturbed production. The MSR-PAC is based on a multisite agent system and on the monitoring of the perturbed virtual jobshops. The method can also be used for controlling short term distributed production activities. 相似文献
85.
86.
Longitudinal associations among adolescents’ organized activity involvement and sociopolitical values 下载免费PDF全文
Benjamin Oosterhoff Kaitlyn A. Ferris Cara A. Palmer Aaron Metzger 《Social Development》2017,26(4):846-859
Organized activities represent a potentially important context for the development of adolescent sociopolitical values, but few studies have examined longitudinal associations between youths’ sociopolitical values and activity involvement. Adolescents (N = 299, Time 1 Mage = 15.49, SD = .93, 62% female) reported on their organized activity involvement (volunteering, church, sports, arts/music, school and community clubs) and sociopolitical values (materialism, social dominance, authoritarianism, patriotism, spirituality) at baseline and one year later. Greater involvement in arts/music predicted lower spirituality and patriotism one year later and greater involvement in church predicted higher levels of spirituality and lower levels of social dominance one year later. Higher levels of materialism predicted less involvement in arts/music one year later and higher social dominance values predicted less involvement in volunteering one year later. Findings support the importance of organized activities in sociopolitical development, and suggest that sociopolitical values may guide decisions concerning future organized activity involvement. 相似文献
87.
88.
Bayesian Monte Carlo (BMC) decision analysis adopts a sampling procedure to estimate likelihoods and distributions of outcomes, and then uses that information to calculate the expected performance of alternative strategies, the value of information, and the value of including uncertainty. These decision analysis outputs are therefore subject to sample error. The standard error of each estimate and its bias, if any, can be estimated by the bootstrap procedure. The bootstrap operates by resampling (with replacement) from the original BMC sample, and redoing the decision analysis. Repeating this procedure yields a distribution of decision analysis outputs. The bootstrap approach to estimating the effect of sample error upon BMC analysis is illustrated with a simple value-of-information calculation along with an analysis of a proposed control structure for Lake Erie. The examples show that the outputs of BMC decision analysis can have high levels of sample error and bias. 相似文献
89.
90.