全文获取类型
收费全文 | 12753篇 |
免费 | 361篇 |
专业分类
管理学 | 1990篇 |
民族学 | 67篇 |
人才学 | 1篇 |
人口学 | 1330篇 |
丛书文集 | 62篇 |
教育普及 | 1篇 |
理论方法论 | 1061篇 |
现状及发展 | 1篇 |
综合类 | 150篇 |
社会学 | 6004篇 |
统计学 | 2447篇 |
出版年
2023年 | 99篇 |
2021年 | 73篇 |
2020年 | 194篇 |
2019年 | 281篇 |
2018年 | 364篇 |
2017年 | 471篇 |
2016年 | 384篇 |
2015年 | 244篇 |
2014年 | 316篇 |
2013年 | 2189篇 |
2012年 | 458篇 |
2011年 | 362篇 |
2010年 | 327篇 |
2009年 | 313篇 |
2008年 | 326篇 |
2007年 | 331篇 |
2006年 | 318篇 |
2005年 | 290篇 |
2004年 | 277篇 |
2003年 | 247篇 |
2002年 | 289篇 |
2001年 | 334篇 |
2000年 | 316篇 |
1999年 | 278篇 |
1998年 | 185篇 |
1997年 | 175篇 |
1996年 | 171篇 |
1995年 | 166篇 |
1994年 | 135篇 |
1993年 | 155篇 |
1992年 | 177篇 |
1991年 | 154篇 |
1990年 | 158篇 |
1989年 | 183篇 |
1988年 | 159篇 |
1987年 | 138篇 |
1986年 | 150篇 |
1985年 | 170篇 |
1984年 | 167篇 |
1983年 | 159篇 |
1982年 | 124篇 |
1981年 | 106篇 |
1980年 | 108篇 |
1979年 | 140篇 |
1978年 | 90篇 |
1977年 | 89篇 |
1976年 | 88篇 |
1975年 | 82篇 |
1974年 | 82篇 |
1973年 | 73篇 |
排序方式: 共有10000条查询结果,搜索用时 265 毫秒
991.
While school-based adolescent victimization has received a great deal of public attention, there exist relatively few theoretically driven studies aimed at explaining this phenomenon. We address this paucity by providing a test of a criminal-opportunity model of school-based victimization using data on over 3,000 students from 40 different Kentucky middle and high schools. The effects of opportunity-related concepts are estimated for both violent and property victimization, and comparisons are made for each victimization type across middle- and high-school student subsamples. Findings suggest that criminal opportunity theory is relevant to the understanding of school-based victimization. In particular, indicators of exposure to crime and target antagonism appear to be robust predictors. Further, there appears to be substantial generalizability in the effects of opportunity-related variables across violent versus property victimization as well as across middle-school versus high-school contexts. 相似文献
992.
The present study examined the impact of domestic violence on maternal and infant health by assessing maternal health during pregnancy and infant health at two months postpartum. Two hundred and two women (68 battered and 134 non-battered) were recruited from the community and completed both pregnancy and 2-month postpartum interviews. Results revealed that domestic violence during pregnancy was associated with numerous health problems for mothers and infants including more health problems during pregnancy, more likelihood of premature labor, later entrance into prenatal care, lower infant birth weight, greater utilization of health care resources, and more prenatal substance use. After income was controlled, the relationship between violence and timing of prenatal care and infant birth weight became nonsignificant. Maternal social support was found to protect against the effects of violence for several health outcomes. The current findings suggest the need for domestic violence screening during pregnancy, as well as clinical interventions for battered, pregnant women in order to prevent serious physical and emotional problems for both mothers and their infants. 相似文献
993.
Bohr PC 《Work (Reading, Mass.)》2002,19(2):185-191
Health and safety literature stresses the value of programs aimed at preventing musculoskeletal injuries. The concepts of empowerment learning are often recommended as guidelines for worker education yet these approaches are largely untested. The present study compares the traditional approach involving lecture and discussion with a participatory method. A sample of 102 participants employed at a centralized reservation facility was used. Participants were randomly assigned to either the traditional education group or the participatory education group. Data collection utilized surveys completed by study participants and observational checklists completed by a trained observer. Data were collected prior to intervention and at approximately 3, 6, and 12 months post intervention. Results of data analysis provide no evidence that participatory methods are more effective than traditional methods in encouraging workers to position their work equipment correctly or to maintain good working postures to prevent musculoskeletal injuries. 相似文献
994.
Millions of workers suffer from upper extremity (musculoskeletal) disorders. Many of these workers are predisposed to upper extremity musculoskeletal disorders because of early exposure to ergonomic risks as students. Computer usage for four or more hours remains the greatest risk for upper extremity musculoskeletal disorders for workers and students alike. Developing preventative methods to reduce student exposure, and thus protect future workers from upper extremity musculoskeletal disorders later in life, requires an appropriate measure for upper extremity musculoskeletal disorder prevalence and related limitations for student functioning. Item response theory analysis was used to evaluate and further develop a upper extremity functioning scale for the student role. 相似文献
995.
Pandorf CE Harman EA Frykman PN Patton JF Mello RP Nindl BC 《Work (Reading, Mass.)》2002,18(2):179-189
To examine correlates of the speed at which female soldiers carrying loads could cover 3.2 km on foot and traverse an obstacle course, 12 volunteers (mean +/- SD: 25.3 +/- 6 years, 166 +/- 7 cm, 61.3 +/- 7 kg) were timed over 3.2 km while carrying loads of 14, 27, and 41 kg, and while traversing an obstacle course with the two lighter loads. Pearson correlations showed that absolute VO_[2 max] and 3.2 km run time without a load were the best predictors of 3.2 km load carriage time for all loads. Also, larger subjects with greater muscle mass were able to carry the heaviest load faster than smaller, less muscular subjects, likely because the 41 kg load represented a smaller percentage of the former's bodyweight. Maximum number of sit-ups and push-ups, composite score of the Army Physical Fitness Test as well as body height were positively correlated with the speed at which some course segments were traversed. 相似文献
996.
The Quality of Stakeholder-Based Decisions 总被引:5,自引:0,他引:5
Thomas C. Beierle 《Risk analysis》2002,22(4):739-749
The increased use of stakeholder processes in environmental decision making has raised concerns about the quality of decisions these processes produce. Some claim that stakeholders make inadequate use of scientific information and analysis and are all too ready to sacrifice technical quality for political expediency. This article looks to the case study record to examine the quality of the decisions from stakeholder-based processes. The data for the analysis come from a "case survey," in which researchers coded information from 239 published case studies of stakeholder involvement in environmental decision making. These cases reflect a diversity of planning, management, and implementation activities carried out by environmental and natural resource agencies at many levels of government. Overall, the case-study record suggests that there should be little concern that stakeholder processes are resulting in low-quality decisions. The majority of cases contain evidence of stakeholders improving decisions over the status quo; adding new information, ideas, and analysis; and having adequate access to technical and scientific resources. Indeed, data suggest that it is the more intensive stakeholder processes--precisely those that have aroused recent concern--that are more likely to result in higher-quality decisions. 相似文献
997.
The costs of hospitals. Developments of the German hospital sector evaluated in the case of Berlin This article illustrates the development of the German hospital sector evaluated in the case of the capital Berlin. Due to the difficult economic situation of the hospital sector after the reunification major reforms became unavoidable. Especially a reduction of the average days of stay per case created overcapacities of personell. But all the reforms which have been taken during the last years had to consider the major role of the hospital sector for the labour market of the city. On the one hand the article shows, that the reforms of the nineties have been successful also with regard to the important role for the labour market. On the other hand the restructuring of the hospital sector is not finished yet, there is still a need for further reforms. 相似文献
998.
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
999.
Hagerty Michael R. Cummins Robert A. Ferriss Abbott L. Land Kenneth Michalos Alex C. Peterson Mark Sharpe Andrew Sirgy Joseph Vogel Joachim 《Social indicators research》2001,55(1):1-96
A number of governments and public policy institutes have developed Quality of Life Indexes – statistics that attempt to measure the quality of life for entire states or regions. We develop 14 criteria for determining the validity and usefulness of such QOL indexes to public policy. We then review 22 of the most-used QOL indexes from around the world. We conclude that many of the indexes are successful in that they are reliable, have established time series measures, and can be disaggregated to study subpopulations. However, many fall short in four areas: (1) indexes vary greatly in their coverage and definitions of domains of QOL, (2) none of the indexes distinguish among the concepts of input, throughput, and output that are used by public policy analysts, (3) they fail to show how QOL outputs are sensitive to public policy inputs, and (4) none have examined convergent validity against each other. We conclude that many of these indexes are potentially very useful for public policy and recommend research to further improve them. 相似文献
1000.
Risk Perception in a Developing Country: The Case of Chile 总被引:2,自引:0,他引:2
In this work we characterize risk perception in Chile, based on the psychometric paradigm, exploring the difference between perceived social and personal risk. For this purpose, we conducted a survey including 54 hazards, 16 risk attributes, and 3 risk constructs. The survey, divided into four parts, was administered to 508 residents of Santiago, Chile. Using factor analysis, three main factors, which accounted for 80% of the sample's variance, were identified: factor 1, commonly called "Dread Risk" in the literature, explained 37% of variance; factor 2, "Unknown Risk," explained 28%; and factor 3, which we called "Personal Effect," explained 15% of the variance. On average, individuals perceived themselves as less exposed to risk and with more control and knowledge about them than the general population. OLS regression models were used to test the association of perceived risk with the three main factors. For social risk, factor 1 had the greatest explanatory power, while factor 2 had a negative sign. For personal risk, only factors 2 and 3 were significant, with factor 3 having the greatest explanatory power. Risk denial (defined as the difference between perceived personal and social risk) was associated with factors 1 and 2 only, with factor 2 having a negative sign. The difference between desired and actual regulation levels proved positive for all hazards, thus indicating that Chileans are dissatisfied with the current regulation level for all the hazards analyzed. The comparison of data at the aggregate and at the individual subject's level suggests that while the aggregate analysis overestimates the magnitude of the correlations it still reflects the tendency of the individual responses. 相似文献