全文获取类型
收费全文 | 4949篇 |
免费 | 124篇 |
国内免费 | 20篇 |
专业分类
管理学 | 733篇 |
民族学 | 25篇 |
人口学 | 660篇 |
丛书文集 | 29篇 |
理论方法论 | 428篇 |
综合类 | 215篇 |
社会学 | 1985篇 |
统计学 | 1018篇 |
出版年
2023年 | 23篇 |
2022年 | 16篇 |
2021年 | 23篇 |
2020年 | 70篇 |
2019年 | 95篇 |
2018年 | 154篇 |
2017年 | 191篇 |
2016年 | 176篇 |
2015年 | 111篇 |
2014年 | 112篇 |
2013年 | 664篇 |
2012年 | 314篇 |
2011年 | 234篇 |
2010年 | 113篇 |
2009年 | 80篇 |
2008年 | 105篇 |
2007年 | 93篇 |
2006年 | 84篇 |
2005年 | 611篇 |
2004年 | 329篇 |
2003年 | 175篇 |
2002年 | 90篇 |
2001年 | 140篇 |
2000年 | 90篇 |
1999年 | 49篇 |
1998年 | 49篇 |
1997年 | 42篇 |
1996年 | 33篇 |
1995年 | 36篇 |
1994年 | 41篇 |
1993年 | 35篇 |
1992年 | 50篇 |
1991年 | 55篇 |
1990年 | 35篇 |
1989年 | 36篇 |
1988年 | 44篇 |
1987年 | 19篇 |
1986年 | 27篇 |
1985年 | 41篇 |
1984年 | 32篇 |
1983年 | 40篇 |
1982年 | 27篇 |
1981年 | 24篇 |
1980年 | 23篇 |
1979年 | 25篇 |
1978年 | 41篇 |
1977年 | 21篇 |
1976年 | 27篇 |
1975年 | 27篇 |
1968年 | 15篇 |
排序方式: 共有5093条查询结果,搜索用时 866 毫秒
511.
A counterfactual model is used to determine if sex discrimination in salaries existed at Illinois State University. The analysis makes use of detailed peer evaluations of each faculty members's productivity in scholarly productivity, teaching, and service. The model is extended to examine the effects of Affirmative Action salary increments given female faculty members. Evidence of sex discrimination in salaries against female faculty is found. The Affirmative Action salary program erased this discrimination and introduced statistically significant discrimination against male faculty. 相似文献
512.
Use of a suitable stopping rule yields exact uniformly most powerful tests and minimum variance unbiased estimators of various parameters of a Markov branching model with or without immigration. The population model discussed includes the pure birth, simple epidemic, immigration-death, M/M/ 1 queue, linear birth-death and a branching diffusion process, among others, as special cases. 相似文献
513.
An approach to communicating decision and risk analysis findings to managers is illustrated in a real case context. This article consists essentially of a report prepared for senior managers of the Nuclear Regulatory Commission to help them make a reactor safety decision. It illustrates the communication of decision analysis findings relating to technical risks, costs, and benefits in support of a major risk management decision: whether or not to require a safety backfit. Its focus is on the needs of decision makers, and it introduces some novel communication devices. 相似文献
514.
R. M. Haralick E. Dougherty J. Ha T. Kanungo S. Karasu C. K. Lee L. Rystrom V. Ramesh I. Phillips 《Journal of applied statistics》1994,21(1):341-354
This paper first introduces a parametric model for the generation of stationary random correlated binary sequences. The parameters of the model include the probability that a pixel is a binary one pixel and the length of the structuring element which dilates the initially spatially uncorrelated sequence. The spatial statistics of such eroded, dilated, opened and closed correlated binary sequences are derived in terms of the spatial statistics of the input binary sequence. Understanding of such one-dimensional processing is a precondition for understanding what happens in the more interesting two- dimensional case. 相似文献
515.
516.
517.
518.
Rao (1963) has formulated a damage model which we call an additive damage model. A suitable damage model, which we call a multiplicative damage model, has been considered by Krishnaji (1970) for income-related problems. In these models, an original observation is subjected to damage, e.g., death or under-reporting, according to a specified probability law. Within the framework of an additive damage model, with a special form of damage, characterizations of the linear and logarithmic exponential families are formulated using regression properties of the damaged part on the undamaged part. The characterizations of the gamma and Pareto distributions that have been found of some use in the theory of income distributions, are obtained as special cases. Similar results are investigated within the framework of the multiplicative damage model. 相似文献
519.
V. Joksimovich 《Risk analysis》1984,4(4):255-266
A large number of PRA studies have been completed for specific plants at specific sites. From these studies, taken individually or collectively, many significant insights have evolved into items important to risk and safety. The content of this paper is primarily based on the material contained in the EPRI funded review of five PRA studies: Big Rock Point, Zion, Limerick, Grand Gulf, and Arkansas Nuclear One. The first three were the utility sponsored studies publicly available at the time of project initiation while the other two were deemed representative of the NRC's RSSMAP and IREP programs respectively. The results of PRA studies are usually expressed in terms of core melt frequencies, radionuclide release frequencies, and frequencies of occurrence of different reactor accident consequences (e.g., early and latent fatalities) depending on the level of PRA. These subjects are prominently addressed in this paper. One of the results of a PRA study is identification of a relatively small number of accident sequences that represent the dominant contributors to core melt. An analysis of the salient features of the dominant accident sequences from eleven PRA's yielded a characterization of accident sequence categories discussed at some length. Impact of external events is discussed very briefly. Next to an explicit quantification of public risk or core melt frequency, the identification of specific safety concerns and the evaluation of possible solutions to implement risk management are probably the best recognized and most widely used applications of PRA. Several illustrative examples are briefly discussed. Human interactions are extremely important contributors to safety and reliability of the plants. A review of PRA studies concluded that it was necessary to account for five types of human interactions; some of which may mitigate while others may exacerbate an accident sequence. 相似文献
520.