全文获取类型
收费全文 | 21950篇 |
免费 | 86篇 |
专业分类
管理学 | 2878篇 |
民族学 | 116篇 |
人才学 | 8篇 |
人口学 | 1943篇 |
丛书文集 | 122篇 |
教育普及 | 2篇 |
理论方法论 | 1982篇 |
现状及发展 | 1篇 |
综合类 | 257篇 |
社会学 | 10657篇 |
统计学 | 4070篇 |
出版年
2024年 | 120篇 |
2023年 | 129篇 |
2021年 | 116篇 |
2020年 | 352篇 |
2019年 | 555篇 |
2018年 | 516篇 |
2017年 | 705篇 |
2016年 | 531篇 |
2015年 | 406篇 |
2014年 | 505篇 |
2013年 | 3570篇 |
2012年 | 765篇 |
2011年 | 655篇 |
2010年 | 531篇 |
2009年 | 515篇 |
2008年 | 581篇 |
2007年 | 573篇 |
2006年 | 548篇 |
2005年 | 510篇 |
2004年 | 505篇 |
2003年 | 471篇 |
2002年 | 483篇 |
2001年 | 522篇 |
2000年 | 429篇 |
1999年 | 432篇 |
1998年 | 360篇 |
1997年 | 337篇 |
1996年 | 355篇 |
1995年 | 311篇 |
1994年 | 292篇 |
1993年 | 297篇 |
1992年 | 333篇 |
1991年 | 338篇 |
1990年 | 311篇 |
1989年 | 292篇 |
1988年 | 276篇 |
1987年 | 257篇 |
1986年 | 245篇 |
1985年 | 278篇 |
1984年 | 272篇 |
1983年 | 278篇 |
1982年 | 213篇 |
1981年 | 195篇 |
1980年 | 191篇 |
1979年 | 189篇 |
1978年 | 159篇 |
1977年 | 164篇 |
1976年 | 148篇 |
1975年 | 131篇 |
1974年 | 105篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Potenza MN Steinberg MA Wu R Rounsaville BJ O'malley SS 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2006,22(2):241-254
Background Few investigations have characterized groups of older adults with gambling problems, and published reports are currently limited by small samples of older adult problem gamblers. Gambling helplines represent a widespread mechanism for assisting problem gamblers to move into treatment settings. Given data from older adult problem gamblers in treatment, we hypothesized that older as compared with younger adult problem gamblers calling a gambling helpline would be less likely to report gambling-related problems.Design and methods Logistic regression analyses were performed on data obtained from January 1, 2000 to December 31, 2001, inclusive, from callers with gambling problems (N = 1,084) contacting the Connecticut Council on Problem Gambling Helpline.Results Of the 1,018 phone calls used in the logistic regression analyses, 168 (16.5%) were from older adults and 850 (83.5%) from younger adults. Age-related differences were observed in demographic features, types and patterns of gambling reported as problematic, gambling-related problems and psychiatric symptoms, substance use problems, patterns of indebtedness, and family histories of addictive disorders. Older as compared with younger adult problem gamblers were more likely to report having lower incomes, longer durations of gambling, fewer types of problematic gambling, and problems with casino slot machine gambling and less likely to report gambling-related anxiety, family problems, illegal behaviors and arrests, drug problems, indebtedness to bookies or acquaintances, family histories of drug abuse, and problems with casino table gambling.Conclusions Older as compared with younger adult problem gamblers calling a gambling helpline differ on many clinically relevant features. The findings suggest the need for improved and unique prevention and treatment strategies for older adults with gambling problems. 相似文献
993.
As a number of new nations emerged in the early nineties, there has been a spurt in regulatory initiatives in transition countries
toward nation building and socio-economic reforms. A key prerequisite to policy changes is an understanding of the related
patterns and policies. This paper provides an overview of the smoking trends in transition nations, broken by gender and age,
and the antismoking policies in place. In particular, four different types of non-price policies are studied. Comparisons
with the rest of the world show that transition countries do not fare badly in terms of implementing antismoking policies
and are, in fact, better in some cases than other countries. However, greater smoking prevalence for some population subgroups
in transition nations suggests that either some other socio-economic factors influencing smoking prevalence might be at play
or there might be some enforcement issues with the policies in place. 相似文献
994.
Urban vegetation is commonly described as dominated by weedy species that are adapted to human disturbance. In this study,
we determined the original (pre-agriculture) habitats of urban plant species sampled quantitatively in the spontaneous vegetation
of a university campus in Halifax, Nova Scotia (eastern Canada). We sampled 11 distinct patch types corresponding to different
built forms. Differences in vegetation among patch types were related in part to environmental variables such as soil moisture
and light availability. The urban vegetation was dominated by species from rocky habitats such as cliffs and talus slopes,
with lesser representation from grassland and floodplain habitats. When compared to a null model of species origins based
on the global area and species richness of different original habitats, species from rock outcrops and grassland habitats
were overrepresented in the urban vegetation. These results contrast with the received view that cities represented highly
“unnatural” ecosystems: built form appears to replicate the habitat templates required by rock outcrop species. Urban ecological
theory should incorporate the replication of habitat analogs by built forms in addition to the creation of ecologically novel
habitats. 相似文献
995.
Stephen D. Whitney M.S. Emiko A. Tajima Ph.D. Todd I. Herrenkohl Ph.D. Bu Huang Ph.D. 《Child and Adolescent Social Work Journal》2006,23(3):316-342
This study investigated child welfare practitioners’ ratings of the severity of parental discipline practices. Ratings varied by the type of act, age of the child, and by chronicity. Exploratory investigation into changes across time found that current practitioners (N = 27) rated several practices (e.g. spanking and shaking) as more severe than did professionals (N = 24) sampled in 1977. Results underscore the complexity of defining child maltreatment and offer implications for practitioners, applied researchers, and child welfare policy makers.The authors Stephen D. Whitney, Emiko A. Tajima, Todd I. Herrenkohl, and Bu Huang are affiliated with the School of Social Work, University of Washington.Work on this project is supported by funds from the Social Work Prevention Research Center, School of Social Work, University of Washington (National Institute of Mental Health Grant R24MH56599, Lewayne Gilchrist, PI) and by the University of Washington Royalty Research Fund. 相似文献
996.
Survey nonresponse and the distribution of income 总被引:1,自引:0,他引:1
The paper examines the distributional implications of selective compliance in sample surveys, whereby households with different
incomes are not equally likely to participate. Poverty and inequality measurement implications are discussed for monotonically
decreasing and inverted-U compliance-income relationships. We demonstrate that the latent income effect on the probability
of compliance can be estimated from information on response rates across geographic areas. On implementing the method on the
Current Population Survey for the U.S. we find that the compliance probability falls monotonically as income rises. Correcting
for nonresponse appreciably increases mean income and inequality, but has only a small impact on poverty incidence up to poverty
lines common in the U.S.
Martin Ravallion: Corresponding author. 相似文献
997.
998.
999.
C. Nakhanakhup P. Moungmee H. J. Appell J. A. Duarte 《European review of aging and physical activity》2006,3(1):10-19
It is widely accepted that regular physical exercise helps diabetic patients control blood glucose, reduce cardiovascular risk factors, and prevent other related complications. In spite of the undoubted benefits of regular physical exercise, diabetic patients with chronic complications should be aware of potential hazards of practicing exercise. To avoid some harmful consequences of acute exercise, it is necessary to adopt a vigilant attitude with these risk patients and to carefully adjust type and intensity of exercise to the individual situation. This article intends to summarize and analyze the current literature concerning the preventive and therapeutic effects of regular exercise in diabetic patients, pointing out its physiological influence on blood glucose regulation, and to analyze the potential risks of acute physical exercise and the precautions given to patients with a variety of complications. 相似文献
1000.
Problems with ambulation and mobility are frequent problems in older adults. Each year, about one in 100 older adults develops new severe mobility disability. Assessment of abnormal gait constitutes a major component of clinical practice and may lead to fall reduction. Clinicians can benefit from simple gait and mobility assessment tools to be used in busy clinical settings. This review focuses on gait and stepping performance measures that can be used by the busy clinician to assess gait, mobility performance, balance, and falls risk in the older adult. 相似文献