全文获取类型
收费全文 | 11388篇 |
免费 | 250篇 |
专业分类
管理学 | 1711篇 |
民族学 | 59篇 |
人才学 | 1篇 |
人口学 | 1086篇 |
丛书文集 | 56篇 |
理论方法论 | 925篇 |
综合类 | 126篇 |
社会学 | 5174篇 |
统计学 | 2500篇 |
出版年
2021年 | 63篇 |
2020年 | 167篇 |
2019年 | 225篇 |
2018年 | 291篇 |
2017年 | 367篇 |
2016年 | 278篇 |
2015年 | 206篇 |
2014年 | 264篇 |
2013年 | 1985篇 |
2012年 | 348篇 |
2011年 | 344篇 |
2010年 | 265篇 |
2009年 | 241篇 |
2008年 | 254篇 |
2007年 | 293篇 |
2006年 | 237篇 |
2005年 | 251篇 |
2004年 | 230篇 |
2003年 | 226篇 |
2002年 | 256篇 |
2001年 | 278篇 |
2000年 | 262篇 |
1999年 | 232篇 |
1998年 | 184篇 |
1997年 | 178篇 |
1996年 | 170篇 |
1995年 | 166篇 |
1994年 | 155篇 |
1993年 | 147篇 |
1992年 | 181篇 |
1991年 | 170篇 |
1990年 | 157篇 |
1989年 | 149篇 |
1988年 | 151篇 |
1987年 | 142篇 |
1986年 | 121篇 |
1985年 | 142篇 |
1984年 | 157篇 |
1983年 | 178篇 |
1982年 | 128篇 |
1981年 | 121篇 |
1980年 | 114篇 |
1979年 | 126篇 |
1978年 | 127篇 |
1977年 | 111篇 |
1976年 | 101篇 |
1975年 | 93篇 |
1974年 | 75篇 |
1973年 | 73篇 |
1972年 | 58篇 |
排序方式: 共有10000条查询结果,搜索用时 109 毫秒
351.
Castel AD Reed G Davenport MG Harrison LH Blythe D 《Journal of American college health : J of ACH》2007,56(2):119-127
OBJECTIVE: Maryland became the first state to pass a vaccination law requiring college and university students living on campus to obtain a meningococcal vaccination or to sign a waiver refusing vaccination because college students are at increased risk for disease. The authors sought to identify how Maryland colleges addressed the law and determine whether schools were in full compliance. PARTICIPANTS: The authors surveyed 32 college/university administrators via a self-administered questionnaire. METHODS: The authors calculated vaccination and waiver rates and assessed compliance with the law overall and with specific law components. RESULTS: Among 28 participating schools, annual vaccination rates and waiver rates among students during 2000-2004 ranged from 66%-76% and 12%-17%, respectively. Two (7%) schools were compliant with all components of the law. CONCLUSIONS: Mandatory vaccination laws do not ensure compliance at the college and university level. Mandatory reporting, increased education, and collaboration between colleges and universities and public health agencies are needed. 相似文献
352.
Demographic studies indicate a remarkable aging trend in North America. An accurate profile of the decline in physical and cognitive capabilities over time is essential to our understanding of the aging process. This study examined the maintenance of skilled performance across the careers of 96 professional golfers. Data were collected on scoring average, driving distance, driving accuracy, greens in regulation, putts per round, and number of competitive rounds played using online data archives. Analyses indicate that performance in this activity can be maintained to a greater extent than in activities relying on biologically constrained abilities. Although the generalizability of these results to "normal" aging populations is not known, they suggest that acquired skills can be maintained to a large extent in the face of advancing age. 相似文献
353.
Publishing performance information about local public services,an increasing trend in many Organisation for Economic Co-operationand Development countries, matters politically because it hasan effect on incumbent local governments' electoral support.Voters are able to use performance information to punish orreward incumbents in the elections that follow their publication,which may fill a gap in the chain of accountability betweenvoters and governments. We model the introduction of publishedComprehensive Performance Assessments of local authorities inEngland, which make summary information about performance availableto voters, as a "shock" to the relationship between voters andincumbents. Controlling for an unpublicized measure of performancechange over time, change in the local tax level, change in localeconomic conditions, and whether the local incumbent is theparty of the incumbent government at the national level, wefind negativity bias. Incumbents in local authorities in the"poor" performance category experience a substantial reductionin aggregate vote share at the election following publication,but there is no similarly sized reward for those in the highestperformance category. 相似文献
354.
This paper reviews the main bodies of contemporary urban sustainability theory. From this analysis, two underpinning paradigms
of urban sustainability are identified: (1) The ‘Human Exemptionalism Paradigm’ (HEP), which emphasizes the ability of humans
to overcome environmental problems—see Urban Sociology, Urban Ecology, Urban Geography, Urban Psychology and Political Economy;
and (2) The ‘New Ecological Paradigm’ (NEP), which emphasizes the criticality of ecological limits to human progress—see Urban
Metabolism, Energy/Emergy Analysis and Ecological Footprinting. Each of these approaches is critically reviewed, highlighting
their main assumptions, theoretical and practical foci. It is argued in the paper that if the related issues of urban sustainability
and development are to be progressed, there needs to be: (1) a greater maturation of the NEP approaches, which are ‘relative
newcomers’ to the area of urban theory; and (2) greater integration and dialogue between the HEP and NEP approaches to urban
sustainability than has hitherto been the case.
相似文献
Murray G. PattersonEmail: |
355.
Shumway ST Kimball TG Korinek AW Arredondo R 《Journal of marital and family therapy》2007,33(2):134-148
Employee assistance professionals are expected to be proficient at intervening in organizations and creating meaningful behavioral change in interpersonal functioning. Because of their training in family systems theories and concepts, marriage and family therapists (MFTs) are well suited to serve organizations as "systems consultants." Unfortunately, the authors were unable to identify any family systems-based models for organizational intervention that have been empirically tested and supported. In this article, the authors present a family systems-based model of intervention that they developed while working in an employee assistance program (EAP). They also present research that was used to refine the model and to provide initial support for its effectiveness. 相似文献
356.
Morris J 《Journal of marital and family therapy》2007,33(4):439-442
357.
358.
A knowledge-based system supporting managerial problem diagnosis is described. The system provides the capability to monitor values of selected variables for problem situations. When problems are located, a list of problem symptoms is delivered to a problem processor for structuring and diagnosis. Problem structuring is based on a combination of concepts from expert systems and structural modeling. User assertions about cause-effect relationships between pairs of variables are maintained in a semantic network. Problem diagnosis uses the relationships in the semantic network to construct causation trees, the branches of which represent potential explanations of the problem symptoms. Mathematical models are constructed based on causation-tree branches, and values from the data base are used to test whether the model confirms the diagnosis. If so, the source of the problem has been located and it is then up to the user to resolve the problem. If the model fails to explain the problem, the model apparently is deficient and the user may perform “what if…” type scenarios in attempts to improve the model and search for problem causes. Realistic applications in the accounting and health care areas are discussed. 相似文献
359.
James R. Evans 《决策科学》1986,17(2):250-262
Creative problem solving is seldom addressed directly in the decision sciences literature. The first half of this paper reviews current thinking about creativity and its educational importance. The remainder addresses creative problem-solving processes and, in particular, the process developed by Parnes, Noller and Biondi [24] and Osborn [23]. This process has been integrated into an OR/MS problem-solving course which is described. Conclusions and implications for decision sciences education and practice in general are discussed. 相似文献
360.
Sergio G. Koreisha 《决策科学》1984,15(2):177-196
This article presents an efficient way of dealing with adaptive expectations models—a way that makes use of all the information available in the data. The procedure is based on multiple-input transfer functions (MITFs): by calculating lead and lag cross correlations between innovations associated with the variables in the model, it is possible to determine which periods have the greatest effects on the dependent variable. If information about k periods ahead is required, fitted values for the expectation variables are used to generate k-period-ahead forecasts. These in turn can be used in the estimation of the transfer function equation, which not only contains the usual lagged variables but also allows for incorporation of lead-fitted values for the expectation variables. The MITF identification and estimation procedures used are based on the corner method. The method is contrasted with the Almon distributed-lag approach using a model relating stock market prices to interest rates and expected corporate profits. 相似文献