全文获取类型
收费全文 | 22335篇 |
免费 | 746篇 |
国内免费 | 2篇 |
专业分类
管理学 | 2977篇 |
民族学 | 139篇 |
人才学 | 1篇 |
人口学 | 1998篇 |
丛书文集 | 94篇 |
教育普及 | 1篇 |
理论方法论 | 2088篇 |
综合类 | 266篇 |
社会学 | 11252篇 |
统计学 | 4267篇 |
出版年
2023年 | 167篇 |
2022年 | 88篇 |
2021年 | 160篇 |
2020年 | 438篇 |
2019年 | 629篇 |
2018年 | 742篇 |
2017年 | 969篇 |
2016年 | 787篇 |
2015年 | 516篇 |
2014年 | 689篇 |
2013年 | 3956篇 |
2012年 | 895篇 |
2011年 | 814篇 |
2010年 | 622篇 |
2009年 | 514篇 |
2008年 | 632篇 |
2007年 | 595篇 |
2006年 | 627篇 |
2005年 | 497篇 |
2004年 | 513篇 |
2003年 | 415篇 |
2002年 | 435篇 |
2001年 | 513篇 |
2000年 | 457篇 |
1999年 | 433篇 |
1998年 | 337篇 |
1997年 | 282篇 |
1996年 | 296篇 |
1995年 | 303篇 |
1994年 | 267篇 |
1993年 | 263篇 |
1992年 | 304篇 |
1991年 | 297篇 |
1990年 | 296篇 |
1989年 | 255篇 |
1988年 | 247篇 |
1987年 | 203篇 |
1986年 | 232篇 |
1985年 | 261篇 |
1984年 | 221篇 |
1983年 | 198篇 |
1982年 | 163篇 |
1981年 | 130篇 |
1980年 | 165篇 |
1979年 | 175篇 |
1978年 | 134篇 |
1977年 | 114篇 |
1976年 | 95篇 |
1975年 | 93篇 |
1974年 | 93篇 |
排序方式: 共有10000条查询结果,搜索用时 875 毫秒
21.
Jamie M. Lawler Erika L. Bocknek Ellen W. McGinnis Cecilia Martinez‐Torteya Katherine L. Rosenblum Maria Muzik 《Infancy》2019,24(2):249-274
The current study examined the role of hypothalamic‐pituitary‐adrenal reactivity (a physiological indicator of stress) in early infancy as a mediator of the relationship between maternal postpartum depression and toddler behavior problems. Participants were 137 at‐risk mothers and their children participating in a longitudinal study of intergenerational transmission of risk. Mothers’ depression was measured five times during the infants’ first 18 months. Infant cortisol was collected during a social stressor (the still‐face paradigm) when infants were 6 months old, and mothers reported on toddlers’ internalizing and externalizing symptoms at 18 months. Among this sample of high‐risk mother–infant dyads, early postpartum depression predicted atypical infant cortisol reactivity at 6 months, which mediated the effect of maternal depression on increased toddler behavior problems. Clinical implications are discussed. 相似文献
22.
Gemma M. Carney 《Journal of women & aging》2018,30(3):242-258
The article proposes a Gender Politics of Aging approach to the study of aging societies. The approach recognizes the feminization of old age, ageism’s roots in sexist discourse, and the need to recognize the role of politics in driving demographic debates. Drawing together arguments from feminist gerontology and political demography, the article argues that the intersection of politics and gender must be considered if appropriate responses to an older, feminized demography are to be produced. I conclude that the work of aging feminists provides a rich vein of research and praxis from which a gender politics of aging approach can draw. 相似文献
23.
24.
More than 100 pieces of anti-lesbian, gay, bisexual, transgender (LGBT) legislation are active in 2018. In this current political climate of “conscience clause” legislation, counselor educators and supervisors are poised to adopt more holistic practices in assessing and evaluating student and supervisee readiness to work with LGBT queer (Q) clients. The purpose of this article is to present a dispositional framework for assessment and evaluation and introduce the flexibility, integrity, awareness, stability, compassion, and openness (FIASCO) rubric of professional counseling dispositions. Two court cases, Keeton v. Anderson-Wiley and Ward v. Wilbanks, are used as case examples for applying the FIASCO rubric to situations involving LGBTQ clients. 相似文献
25.
A simple connected graph G with 2n vertices is said to be k-extendable for an integer k with \(0<k<n\) if G contains a perfect matching and every matching of cardinality k in G is a subset of some perfect matching. Lakhal and Litzler (Inf Process Lett 65(1):11–16, 1998) discovered a polynomial algorithm that decides whether a bipartite graph is k-extendable. For general graphs, however, it has been an open problem whether there exists a polynomial algorithm. The new result presented in this paper is that the extendability problem is co-NP-complete. 相似文献
26.
Daniel Auer 《Journal of ethnic and migration studies》2018,44(3):341-362
Placement of refugees and subsequent labour market integration within a host country represents a key challenge for policymakers and has emerged as one of the most divisive topics in the public debate. Immigration policy in Switzerland adopts random placement of asylum seekers across its different language regions. Hence, this policy allows to estimate the causal effect of language skills on employment chances, as refugees are exogenously placed across regions where the spoken language could either match or deviate from individual language skills. The results of this ‘natural experiment’ indicate substantially higher probabilities of finding employment when asylum seekers are placed in regions with a lingua franca that matches their individual language skills. Additionally, the findings suggest that language course participation can offset the reduced likelihood of employment in cases of a language mismatch. While random placement of refugees may be desirable for political reasons, it is detrimental to the economic integration process. Thereby, the study draws relevant conclusions for a larger European immigration policy. 相似文献
27.
Open innovation and absorptive capacity are two concepts based on the idea that companies can leverage the knowledge generated externally to improve their innovation performance. The aim of this paper is to analyse the joint effect of open innovation and absorptive capacity on a firm's radical innovation. Open innovation is expressed in terms of external search breadth and depth strategies and absorptive capacity is described by distinguishing between potential and realized absorptive capacity. In order to test our hypotheses, we carried out empirical research in firms operating in high-technology industries. The results indicate that internal routines and processes for absorbing external knowledge help explain radical innovation as they show a significant effect of potential and realized absorptive capacity. Also, there is a moderating effect of absorptive capacity on open innovation. Specifically, potential absorptive capacity exerts a positive effect on the relationship between external search breadth and depth and radical innovation. Realized absorptive capacity moderates the influence of external search breadth. These findings confirm the complementary nature of absorptive capacity and open innovation search strategies on radical innovation. 相似文献
28.
A. M. Abd El-Raheem 《Journal of Statistical Computation and Simulation》2019,89(16):3075-3104
The generalized half-normal (GHN) distribution and progressive type-II censoring are considered in this article for studying some statistical inferences of constant-stress accelerated life testing. The EM algorithm is considered to calculate the maximum likelihood estimates. Fisher information matrix is formed depending on the missing information law and it is utilized for structuring the asymptomatic confidence intervals. Further, interval estimation is discussed through bootstrap intervals. The Tierney and Kadane method, importance sampling procedure and Metropolis-Hastings algorithm are utilized to compute Bayesian estimates. Furthermore, predictive estimates for censored data and the related prediction intervals are obtained. We consider three optimality criteria to find out the optimal stress level. A real data set is used to illustrate the importance of GHN distribution as an alternative lifetime model for well-known distributions. Finally, a simulation study is provided with discussion. 相似文献
29.
This article proposes several estimators for estimating the ridge parameter k based on Poisson ridge regression (RR) model. These estimators have been evaluated by means of Monte Carlo simulations. As performance criteria, we have calculated the mean squared error (MSE), the mean value, and the standard deviation of k. The first criterion is commonly used, while the other two have never been used when analyzing Poisson RR. However, these performance criteria are very informative because, if several estimators have an equal estimated MSE, then those with low average value and standard deviation of k should be preferred. Based on the simulated results, we may recommend some biasing parameters that may be useful for the practitioners in the field of health, social, and physical sciences. 相似文献
30.
Fran M. Collyer 《Journal of historical sociology》2021,34(1):41-54
Australia was settled as a colony of Britain from the 17th century, and its early history of violent occupation has gradually given way to a relatively peaceful, wealthy, multicultural society. As a post-colonial country, its people share characteristics with those of Britain, but, as a multicultural society, national identity is increasingly influenced by the cultures of many countries, from both the global North and South. In this paper, the question of Australia's placement as a country of the global North or South is explored. Considerations of geography, the economy, political regimes and national identity are the backdrop to an investigation of Australian scholarship and the attitudes of scholars to the inclusion of Australia as a country of the global South. 相似文献