全文获取类型
收费全文 | 15066篇 |
免费 | 247篇 |
国内免费 | 2篇 |
专业分类
管理学 | 1940篇 |
民族学 | 69篇 |
人才学 | 4篇 |
人口学 | 1349篇 |
丛书文集 | 83篇 |
理论方法论 | 1358篇 |
综合类 | 128篇 |
社会学 | 7266篇 |
统计学 | 3118篇 |
出版年
2022年 | 76篇 |
2021年 | 77篇 |
2020年 | 207篇 |
2019年 | 268篇 |
2018年 | 394篇 |
2017年 | 510篇 |
2016年 | 353篇 |
2015年 | 286篇 |
2014年 | 354篇 |
2013年 | 2729篇 |
2012年 | 506篇 |
2011年 | 396篇 |
2010年 | 361篇 |
2009年 | 292篇 |
2008年 | 343篇 |
2007年 | 356篇 |
2006年 | 359篇 |
2005年 | 348篇 |
2004年 | 302篇 |
2003年 | 304篇 |
2002年 | 322篇 |
2001年 | 380篇 |
2000年 | 335篇 |
1999年 | 337篇 |
1998年 | 256篇 |
1997年 | 230篇 |
1996年 | 284篇 |
1995年 | 228篇 |
1994年 | 240篇 |
1993年 | 213篇 |
1992年 | 244篇 |
1991年 | 259篇 |
1990年 | 240篇 |
1989年 | 206篇 |
1988年 | 223篇 |
1987年 | 211篇 |
1986年 | 160篇 |
1985年 | 202篇 |
1984年 | 221篇 |
1983年 | 194篇 |
1982年 | 159篇 |
1981年 | 143篇 |
1980年 | 128篇 |
1979年 | 144篇 |
1978年 | 113篇 |
1977年 | 107篇 |
1976年 | 87篇 |
1975年 | 81篇 |
1974年 | 78篇 |
1973年 | 80篇 |
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
41.
Summary Based on 14 case studies of highly effective therapies and the reasons they succeeded less frequently than they could, we
propose a variety of steps to improve the health care system of the U.S.A. Whatever proposal emerges from current national
debates until innovations are shown to be safe and effective, they should not be supported; when slightly better technologies
are much more expensive than other good ones we need to consider appropriate choices carefully; simplified billing and bookkeping
would reduce our costs; when a technology is rapidly introduced cautionnary measures may be needed; tracking immunization
and repairing their omissions requires a new system; educational programs such as seen effective in hypertension should be
applied in other areas such as vaccination; in organ transplantation the nation should consider “presumed consent”; our payment
system sometimes creates perverse incentives and therefore needs review; and the preferences of the public in allocation of
health resources need to be discovered once the public is informed about the issues.
Research supported by Andrew W. Mellon Foundation. 相似文献
42.
43.
STRUCTURE, INSTITUTIONS, POWER, AND IDEOLOGY: New Directions Within Symbolic Interactionism 总被引:1,自引:0,他引:1
Gil Richard Musolf 《The Sociological quarterly》1992,33(2):171-189
Responding to a fusillade of criticism in the 1970s, interactionists made numerous studies to accentuate the structural elements of constraint. This reconstruction of symbolic interactionism (SI) has led to some convergences with the British School of Cultural Studies (BSCS). A selected group of SI studies are reviewed under the rubrics of negotiated order, master institutions, structural categories of gender and race, and power and ideology. Throughout, the article argues that SI's concern with institutions. structure, and power and ideology has some similarities with BSCS but differences are fundamental. Even though its reconstruction remains incomplete, especially in an adequate account of social structure, SI is now making a concerted effort to diminish the astructural bias by articulating macrosociological links between communication and community. 相似文献
44.
In the development of many diseases there are often associated random variables which continuously reflect the progress of a subject towards the final expression of the disease (failure). At any given time these processes, which we call stochastic covariates, may provide information about the current hazard and the remaining time to failure. Likewise, in situations when the specific times of key prior events are not known, such as the time of onset of an occult tumour or the time of infection with HIV-1, it may be possible to identify a stochastic covariate which reveals, indirectly, when the event of interest occurred. The analysis of carcinogenicity trials which involve occult tumours is usually based on the time of death or sacrifice and an indicator of tumour presence for each animal in the experiment. However, the size of an occult tumour observed at the endpoint represents data concerning tumour development which may convey additional information concerning both the tumour incidence rate and the rate of death to which tumour-bearing animals are subject. We develop a stochastic model for tumour growth and suggest different ways in which the effect of this growth on the hazard of failure might be modelled. Using a combined model for tumour growth and additive competing risks of death, we show that if this tumour size information is used, assumptions concerning tumour lethality, the context of observation or multiple sacrifice times are no longer necessary in order to estimate the tumour incidence rate. Parametric estimation based on the method of maximum likelihood is outlined and is applied to simulated data from the combined model. The results of this limited study confirm that use of the stochastic covariate tumour size results in more precise estimation of the incidence rate for occult tumours. 相似文献
45.
In this paper we argue for the importance of a sociologically informed study of organizational accounting practices. By making the nexus between accounting and decision making problematic, instead of given, we move issues of interpretation and hierarchical control to the center stage of understanding the social construction of accounting practices. We suggest that inductive case studies of the organizational setting is a promising methodological strategy for identifying how accounting operates as an organizational control system. We focus on debates and proceedings of the board of directors as an overlooked source of data on decision making and organizational practices. We show how accounting practices are part of the strategic control system that functions to interpret the environment and direct the adaptation of the organization in a manner particular to the substantive rationality of corporate decision makers. We illustrate these contentions with a case study of accounting practice changes over a six year period. 相似文献
46.
This study investigated the gender-specific, self-reported sexual behaviors and attitudes of never-married college students attending a southeastern university in 1973 and 1988. Data were collected by means of a mailed questionnaire that remained essentially unchanged for both years. The authors found that both men and women reported an increase in heterosexual relationships that included sexual intercourse and a decrease in nonsexual relationships with the other gender. The majority of the students perceived themselves as adequately informed about sexuality and satisfied with their relationships, although the proportion of men who reported being satisfied with their relationships declined over the 15 years. The students indicated that sexuality education should focus primarily on information about AIDS and on preparation for marriage. 相似文献
47.
48.
Bivariate probit estimates with partial observability identify the factors influencing the worker’s decision to seek a state
or local government job and the factors influencing the government’s decision to hire particular workers. The estimates routinely
confirm the presence of a local job queue but confirm the presence of a state job queue only when the role of unionization
is explicitly recognized. Our results suggest that the net benefits from local and state government employment are greater
than those from private sector employment. The estimates also indicate that local governments disproportionately hire racial
minorities relative to the local governments’ pool of applicants but indicate no such relationship for state governments.
The authors thank Dale Belman, Jugal Ghorai, and Matt Higgins for help on this and related work. We also thank the referee
and the editor for useful suggestions. 相似文献
49.
The effect of 1980s tort reform legislation on general liability and medical malpractice insurance 总被引:1,自引:1,他引:0
W. Kip Viscusi Richard J. Zeckhauser Patricia Born Glenn Blackmon 《Journal of Risk and Uncertainty》1993,6(2):165-186
A large number of states adopted tort reforms in the mid-1980s to limit the dramatic surge in insurance losses and premiums. Evidence based on liability insurance data by state indicates that these reforms substantially influenced general liability insurance. The levels of losses, premiums, and loss ratios (a measure of insurance profitability) all reflected the impact of the reforms. The large-scale reform efforts in 1986 were particularly influential. Medical malpractice insurance was much less sensitive to the reform efforts. 相似文献
50.