全文获取类型
收费全文 | 10327篇 |
免费 | 169篇 |
专业分类
管理学 | 1527篇 |
民族学 | 45篇 |
人才学 | 1篇 |
人口学 | 975篇 |
丛书文集 | 32篇 |
理论方法论 | 887篇 |
综合类 | 136篇 |
社会学 | 4623篇 |
统计学 | 2270篇 |
出版年
2023年 | 61篇 |
2021年 | 68篇 |
2020年 | 167篇 |
2019年 | 228篇 |
2018年 | 290篇 |
2017年 | 382篇 |
2016年 | 298篇 |
2015年 | 202篇 |
2014年 | 260篇 |
2013年 | 1641篇 |
2012年 | 374篇 |
2011年 | 341篇 |
2010年 | 256篇 |
2009年 | 249篇 |
2008年 | 225篇 |
2007年 | 282篇 |
2006年 | 243篇 |
2005年 | 237篇 |
2004年 | 228篇 |
2003年 | 208篇 |
2002年 | 209篇 |
2001年 | 257篇 |
2000年 | 231篇 |
1999年 | 224篇 |
1998年 | 159篇 |
1997年 | 146篇 |
1996年 | 156篇 |
1995年 | 126篇 |
1994年 | 131篇 |
1993年 | 111篇 |
1992年 | 164篇 |
1991年 | 143篇 |
1990年 | 135篇 |
1989年 | 129篇 |
1988年 | 110篇 |
1987年 | 100篇 |
1986年 | 114篇 |
1985年 | 119篇 |
1984年 | 123篇 |
1983年 | 134篇 |
1982年 | 112篇 |
1981年 | 96篇 |
1980年 | 96篇 |
1979年 | 113篇 |
1978年 | 101篇 |
1977年 | 83篇 |
1976年 | 72篇 |
1975年 | 71篇 |
1974年 | 65篇 |
1973年 | 60篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
B G Link F P Mesagno M E Lubner B P Dohrenwend 《Journal of health and social behavior》1990,31(4):354-369
The problems that people experience in social roles can be regarded as either causes or consequences of psychological symptoms. To reflect one of these possibilities, Pearlin et al. (1981) developed measures of "role strains" which are considered sources of psychopathology. To reflect the other position, Dohrenwend et al. (1981) constructed measures of "role functioning" which are seen as consequences of psychopathology. We show that the measures developed by these two teams of investigators are similar in content and show substantial empirical overlap despite the different meanings attributed to them. In an effort to understand whether these highly correlated measures assess, "role strain" or "role functioning," we conduct an exploratory analysis of marital and housework role problems, using a small panel sample of New York City residents. Specifically, we use instrumental variables to identify reciprocal effects between psychological distress and each role area. We find that the relationship between housework role problems and distress is more consistent with Pearlin et al.'s interpretation, whereas the relationship between marital problems and distress is more consistent with that of Dohrenwend et al. Investigators interested in measuring either role strain or role functioning must bear in mind the strong possibility of contamination from the other construct. 相似文献
102.
Originally presented to the Society of Home Health Care Management of the American College of Physician Executives at its November 16, 1993, meeting in Tucson, Ariz., the program described in this article was the winner of the College's 1994 Innovations Award in Medical Quality Management, sponsored by Merck Sharp & Dohme. The program shows the potential of case management for both improvement in the quality of care and containment of costs for a managed care population with a substantial Medicaid segment. This article is part of a continuing series on innovative programs in home health care. 相似文献
103.
Duenas G 《Latin American population history bulletin》1994,(25):2-22
The author examines family structure in Santa Fe, the capital of New Granada, a Spanish colony that included Colombia, Ecuador, Panama, and Venezuela. The focus is on the late eighteenth and early nineteenth centuries. He finds that social class structure was closely related to ethnic group and skin color, and that the sex ratio was biased toward women. Women also headed nearly 50% of all households. Data are mainly from the 1801 smallpox census. 相似文献
104.
Rubén G. Rumbaut 《Sociological Forum》1994,9(4):583-621
Contemporary immigration to the United States and the formation of new ethnic groups are the complex and unintended social consequences of the expansion of the nation to its post-World War II position of global hegemony. Immigrant communities in the United States today are related to a history of American military, political, economic, and cultural involvement and intervention in the sending countries, especially in Asia and the Caribbean Basin, and to the linkages that are formed in the process that open a variety of legal and illegal migration pathways. The 19.8 million foreign-born persons counted in the 1990 U.S. census formed the largest immigrant population in the world, though in relative terms, only 7.9% of the U.S. population was foreign-born, a lower proportion than earlier in this century. Today's immigrants are extraordinarily diverse, a reflection of polar-opposite types of migrations embedded in very different historical and structural contexts. Also, unlike the expanding economy that absorbed earlier flows from Europe, since the 1970s new immigrants have entered an hourglass economy with reduced opportunities for social mobility, particularly among the less educated, and new waves of refugees have entered a welfare state with expanded opportunities for public assistance. This paper seeks to make sense of the new diversity. A typology of contemporary immigrants is presented, and their patterns of settlement, their distinctive social and economic characteristics compared to major native-born racial-ethnic groups, and their different modes of incorporation in—and consequences for—American society are considered. 相似文献
105.
Davis WG 《Physician executive》1994,20(2):15-17
In October 1992, the American College of Physician Executives sponsored a study tour to Berlin, Germany, and Amsterdam, Holland. Meetings were held with government officials, third-party payers, and providers, and on-site visits were made at hospitals, clinics, and academic centers. The purpose was to study the health care delivery system in those countries and to share some insights with the countries' hosts on the U.S. system. In a series of reports that began in the July issue of the journal, 5 of the 10 study tour participants describe their impressions of the tour and of the health care systems in the countries that were visited. In this final report, the implications of the German and Dutch systems for reform of the U.S. health care system are discussed. 相似文献
106.
107.
Spencer G. Niles Walter P. Anderson Gary Goodnough 《The Career development quarterly》1998,46(3):262-275
Responses to the Adult Career Concerns Inventory (ACCI: Super, Thompson, Lindeman, Myers, & Jordaan, 1988) were organized through cluster analysis to identify different ways in which adults use exploratory behavior to cope with career development tasks. Significant differences in life-role salience among the types of adult career explorers identified were also investigated. Findings indicated a variety of ways in which adults use exploratory behavior. However, no significant differences were found in life-role salience among the types of career explorers. The discussion explains how career counselors can interpret their clients' ACCI profiles to select appropriate career interventions. 相似文献
108.
Immigration has long been a national and state concern. The 1989 Legalized Population Survey (LPS-1) collected data on illegal immigrants to the US who subsequently became legalized aliens under the provisions of the 1986 Immigration Reform and Control Act. These data are used in a study assessing whether undocumented male and female immigrants improve their earnings and occupational status over time and the extent of variation in occupational status and mobility by gender and region. The data indicate that both undocumented men and women, on average, improved their earnings and occupational status between their first jobs in the US and their jobs just before applying for legalization under the 1986 Immigration Reform and Control Act. However, the earnings, occupational status, and occupational mobility of men were greater than for women. 相似文献
109.
A Multivariate Model for Repeated Failure Time Measurements 总被引:1,自引:1,他引:0
Martin Crowder 《Scandinavian Journal of Statistics》1998,25(1):53-67
A parametric multivariate failure time distribution is derived from a frailty-type model with a particular frailty distribution. It covers as special cases certain distributions which have been used for multivariate survival data in recent years. Some properties of the distribution are derived: its marginal and conditional distributions lie within the parametric family, and association between the component variates can be positive or, to a limited extent, negative. The simple closed form of the survivor function is useful for right-censored data, as occur commonly in survival analysis, and for calculating uniform residuals. Also featured is the distribution of ratios of paired failure times. The model is applied to data from the literature 相似文献
110.
LetX1,X2, ..., be real-valued random variables forming a strictly stationary sequence, and satisfying the basic requirement of being either pairwise positively quadrant dependent or pairwise negatively quadrant dependent. LetF^ be the marginal distribution function of theXips, which is estimated by the empirical distribution functionFn and also by a smooth kernel-type estimateFn, by means of the segmentX1, ...,Xn. These estimates are compared on the basis of their mean squared errors (MSE). The main results of this paper are the following. Under certain regularity conditions, the optimal bandwidth (in the MSE sense) is determined, and is found to be the same as that in the independent identically distributed case. It is also shown thatn MSE(Fn(t)) andnMSE (F^n(t)) tend to the same constant, asn→∞ so that one can not discriminate be tween the two estimates on the basis of the MSE. Next, ifi(n) = min {k∈{1, 2, ...}; MSE (Fk(t)) ≤ MSE (Fn(t))}, then it is proved thati(n)/n tends to 1, asn→∞. Thus, once again, one can not choose one estimate over the other in terms of their asymptotic relative efficiency. If, however, the squared bias ofF^n(t) tends to 0 sufficiently fast, or equivalently, the bandwidthhn satisfies the requirement thatnh3n→ 0, asn→∞, it is shown that, for a suitable choice of the kernel, (i(n) ?n)/(nhn) tends to a positive number, asn→∞ It follows that the deficiency ofFn(t) with respect toF^n(t),i(n) ?n, is substantial, and, actually, tends to ∞, asn→∞. In terms of deficiency, the smooth estimateF^n(t) is preferable to the empirical distribution functionFn(t) 相似文献