全文获取类型
收费全文 | 24757篇 |
免费 | 464篇 |
国内免费 | 15篇 |
专业分类
管理学 | 3110篇 |
民族学 | 128篇 |
人才学 | 2篇 |
人口学 | 2136篇 |
丛书文集 | 216篇 |
教育普及 | 2篇 |
理论方法论 | 2310篇 |
综合类 | 1018篇 |
社会学 | 12650篇 |
统计学 | 3664篇 |
出版年
2023年 | 121篇 |
2021年 | 165篇 |
2020年 | 390篇 |
2019年 | 460篇 |
2018年 | 536篇 |
2017年 | 806篇 |
2016年 | 584篇 |
2015年 | 477篇 |
2014年 | 543篇 |
2013年 | 3920篇 |
2012年 | 821篇 |
2011年 | 748篇 |
2010年 | 581篇 |
2009年 | 542篇 |
2008年 | 633篇 |
2007年 | 674篇 |
2006年 | 614篇 |
2005年 | 688篇 |
2004年 | 557篇 |
2003年 | 497篇 |
2002年 | 521篇 |
2001年 | 610篇 |
2000年 | 536篇 |
1999年 | 551篇 |
1998年 | 391篇 |
1997年 | 356篇 |
1996年 | 357篇 |
1995年 | 347篇 |
1994年 | 344篇 |
1993年 | 330篇 |
1992年 | 394篇 |
1991年 | 397篇 |
1990年 | 376篇 |
1989年 | 358篇 |
1988年 | 339篇 |
1987年 | 357篇 |
1986年 | 311篇 |
1985年 | 311篇 |
1984年 | 363篇 |
1983年 | 332篇 |
1982年 | 293篇 |
1981年 | 246篇 |
1980年 | 237篇 |
1979年 | 274篇 |
1978年 | 221篇 |
1977年 | 190篇 |
1976年 | 182篇 |
1975年 | 197篇 |
1974年 | 169篇 |
1973年 | 147篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
Stolzenberg Lisa D'Alessio Stewart J. Rivers James E. Newell Augusto L. 《Social indicators research》2003,61(1):19-57
Determining the size and demographiccharacteristics of substance abuse populationsis extremely important for implementing publicpolicies aimed at the control of substanceabuse. Such information not only assists in theallocation of limited treatment resources bythe state, but also in the monitoring ofsubstance abuse trends over time and in theevaluation of innovative policy initiatives. Inthis study, we develop three composite measuresof treatment need. We then use these measuresto estimate treatment need for alcohol abuseand for controlled substance abuse within eachof Florida's 67 counties. This study providesan important empirical component of communityplanning, quantifying and, to a limited degree,specifying the level of need for the substanceabuse treatment of community residents. Anadditional benefit is the development of a costeffective and unobtrusive methodology fordetermining empirically when levels of need arechanging so that treatment levels can beadjusted accordingly. With proper use,policymakers can readily employ the methodologydeveloped in this study in Florida andelsewhere to make better-informed decisions inthe allocation of finite substance abusetreatment resources. 相似文献
63.
William R. Shadish Kevin Ragsdale Renita R. Glaser Linda M. Montgomery 《Journal of marital and family therapy》1995,21(4):345-360
This article reviews the major findings from a multiproject meta-analysis of the effects of marital and family therapy (MFT). Across 163 randomized trials, MFT demonstrates moderate, statistically significant, and often clinically significant effects. No orientation is yet demonstrably superior to any other, nor is MFT superior to individual therapy. Cost effectiveness information is scant in these 163 studies, but supportive. Randomized experiments yield very different answers from nonrandomized experimental studies of the effects of MFT, calling into question whether we should mix the two in reviews. We have also found several new differences in the ways that marital therapy (MT) and family therapy (FT) studies are conducted, making them harder to compare. Finally, important questions still exist about whether any psychotherapy, including MFT, yet has sufficient information about how well research generalizes to everyday clinical practice. 相似文献
64.
65.
66.
D. R. Wingo 《Statistical Papers》1993,34(1):271-276
In a recent paper in this journal, Lee, Kapadia and Brock (1980) developed maximum likelihood (ML) methods for estimating the scale parameter of the Rayleigh distribution from doubly censored samples. They reported convergence difficulties in attempting to solve numerically the nonlinear likelihood equation (LE). To mitigate these difficulties, they employed approximations to simplify the LE, but found that the solution of the resulting simplified equation can give rise to parameter estimates of erratic accuracy. We show that the use of approximations to simplify the LE is unnecessary. In fact, under suitable parametric transformation, the log-likelihood function is strictly concave, the ML estimate always exists, is unique and finite. Furthermore, the LE is easy to solve numerically. A numerical example is given to illustrate the computations involved. 相似文献
67.
A table is presented for the construction and selection of tightened-normal-tightened sampling scheme of type TNT-(n1, n2;c). Efficiency of TNT-(n1, n2;c) scheme over conventional single and double sampling plans is discussed. 相似文献
68.
Murray L. Wax 《The American Sociologist》1995,26(2):22-34
Philadelphia, then and still one of the worst governed of America’s badly governed cities, was having one of its periodic spasms of reform. A thorough study of causes was called for. Not but what the underlining cause was evident to most white Philadelphians: the corrupt semi-criminal vote of the Negro Seventh Ward…. Would it not be well, to elucidate the known causes by a scientific investigation?… With my bride of three months, I settled in one room over a cafeteria run by a College Settlement, in the worst part of the Seventh Ward. We lived there a year, in the midst of an atmosphere of dirt, drunkenness, poverty and crime. Murder sat on our doorstep, police were our government, and philanthropy dropped in with periodic advice. (DuBois, 1968/1975: 194–5 also in Logan, ed. 1944: 42) What had been borne into me during my book studies was my utter ignorance of the manual-working class, that is, of four-fifths of my countrymen…. How was I to get an opportunity of watching, day by day, in their homes and in their workshops, a sufficient number of normal manual-working families to enable me to visualize the class as a whole; to understand what was meant by chronic poverty and insecurity of livelihood. (Webb, 1926: 146–7) 相似文献
69.
70.
Margaret R. Somers 《Theory and Society》1994,23(5):605-649