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991.
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Shoufan Fang George Z. Gertner Svetlana Shinkareva Guangxing Wang Alan Anderson 《Statistics and Computing》2003,13(3):221-226
The Fourier amplitude sensitivity test (FAST) can be used to calculate the relative variance contribution of model input parameters to the variance of predictions made with functional models. It is widely used in the analyses of complicated process modeling systems. This study provides an improved transformation procedure of the Fourier amplitude sensitivity test (FAST) for non-uniform distributions that can be used to represent the input parameters. Here it is proposed that the cumulative probability be used instead of probability density when transforming non-uniform distributions for FAST. This improvement will increase the accuracy of transformation by reducing errors, and makes the transformation more convenient to be used in practice. In an evaluation of the procedure, the improved procedure was demonstrated to have very high accuracy in comparison to the procedure that is currently widely in use. 相似文献
994.
Disabling Pasts,Enabling Futures? How Does the Changing Nature of Capitalism Impact on the Disabled Worker and Jobseeker? 总被引:4,自引:4,他引:0
Alan Roulstone 《Disability & Society》2002,17(6):627-642
Disability scholars have invested much in a stage theory of capitalism, which affords little scope for disabled workers and job seekers this side of Socialism. Parallel discussions of choices and empowerment rarely penetrates the world of paid employment. Mainstream policy writers meanwhile have been concerned with an atheoretical appraisal of enhancing access to and retention of employment. Neither approach has entered into an examination of the changing nature of employment and the impact of wider relationship between state and capitalism. In this way, the important shift to new social movements in progressing identity and social rights may have overlooked the monumental, but not irreversible loss of power in the enabling state and of old social movements. The article offers a starting point in our understanding of the changing nature of employment, its likely impact on disabled people, whilst asking for a reappraisal of the possible links between old and new social movements. 相似文献
995.
Tree consistency and bounds on the performance of the max-product algorithm and its generalizations 总被引:1,自引:0,他引:1
Finding the maximum a posteriori (MAP) assignment of a discrete-state distribution specified by a graphical model requires solving an integer program. The max-product algorithm, also known as the max-plus or min-sum algorithm, is an iterative method for (approximately) solving such a problem on graphs with cycles. We provide a novel perspective on the algorithm, which is based on the idea of reparameterizing the distribution in terms of so-called pseudo-max-marginals on nodes and edges of the graph. This viewpoint provides conceptual insight into the max-product algorithm in application to graphs with cycles. First, we prove the existence of max-product fixed points for positive distributions on arbitrary graphs. Next, we show that the approximate max-marginals computed by max-product are guaranteed to be consistent, in a suitable sense to be defined, over every tree of the graph. We then turn to characterizing the nature of the approximation to the MAP assignment computed by max-product. We generalize previous work by showing that for any graph, the max-product assignment satisfies a particular optimality condition with respect to any subgraph containing at most one cycle per connected component. We use this optimality condition to derive upper bounds on the difference between the log probability of the true MAP assignment, and the log probability of a max-product assignment. Finally, we consider extensions of the max-product algorithm that operate over higher-order cliques, and show how our reparameterization analysis extends in a natural manner. 相似文献
996.
Following the perspective of "sociological miniaturism," proposed by Stolte, Fine, and Cook (2001), we examine the significance of dust in social life in order to examine the reverberations of the micro-features of everyday life on social structure. Through the examination of the routine, the unexamined, and the commonplace, we hope to gain some insight on how the taken-for-granted aspects of lived experience fit into the larger social order. Dust, by virtue of its "smallness," provides a window through which we can explore social structural issues using microsociological analysis. Specifically we examine how dust and techniques for its control are linked to issues of gender, work, political economy and nation. 相似文献
997.
Social and Political Dimensions of Privacy 总被引:2,自引:0,他引:2
Alan F. Westin 《The Journal of social issues》2003,59(2):431-453
This article provides a framework for analyzing privacy in modern societies, defining information privacy and describing three levels that structure the values assigned to privacy. After describing a contemporary privacy baseline (1945–1960), these concepts are applied to social and political privacy developments in three contemporary eras of steadily growing privacy concerns and societal responses across citizen-government, employee-employer, and consumer-business relationships in 1961–1979, 1980–1989, and 1990–2002. Each period is described in terms of new technology applications, changing social climates, and organizational and legal developments. Effects of the 9/11 terrorist attacks on privacy balances are analyzed and predictions for future privacy developments are presented. The relationship of articles in this issue to the author's framework is noted throughout. 相似文献
998.
Alan D. Chave David J. Thomson 《Journal of the Royal Statistical Society. Series C, Applied statistics》2003,52(3):307-322
Summary. Many geophysical regression problems require the analysis of large (more than 104 values) data sets, and, because the data may represent mixtures of concurrent natural processes with widely varying statistical properties, contamination of both response and predictor variables is common. Existing bounded influence or high breakdown point estimators frequently lack the ability to eliminate extremely influential data and/or the computational efficiency to handle large data sets. A new bounded influence estimator is proposed that combines high asymptotic efficiency for normal data, high breakdown point behaviour with contaminated data and computational simplicity for large data sets. The algorithm combines a standard M -estimator to downweight data corresponding to extreme regression residuals and removal of overly influential predictor values (leverage points) on the basis of the statistics of the hat matrix diagonal elements. For this, the exact distribution of the hat matrix diagonal elements p ii for complex multivariate Gaussian predictor data is shown to be β ( p ii , m , N − m ), where N is the number of data and m is the number of parameters. Real geophysical data from an auroral zone magnetotelluric study which exhibit severe outlier and leverage point contamination are used to illustrate the estimator's performance. The examples also demonstrate the utility of looking at both the residual and the hat matrix distributions through quantile–quantile plots to diagnose robust regression problems. 相似文献
999.
1000.
This paper reports on a follow‐up to adolescence of two longitudinal prospective studies of children placed from public care with non‐related adoptive families in the UK. Factors associated with outcome are presented for 99 children (one index child per adoptive family) who were between 5 and 11 years of age at placement. Information concerning the children's backgrounds and care histories was obtained shortly after placement (T1), from social workers. Adopters were interviewed at T1 and again at the end of the first year (T2). A further follow‐up was conducted an average of six years after placement (T3). Outcomes at T3 were classified as either disrupted, which was true for 23%, continuing and ‘positive’ (49%) or continuing but ‘difficult’ (28%). Bivariate analyses revealed a number of attributes, related to both the child and the adoptive parents, which were associated with differential outcomes. Logistic regression produced five predictors of placement disruption: age at placement, behavioural problems, preferential rejection, time in care and the child's degree of attachment to the new mother. Differences were found between ‘positive’ and ‘difficult’ outcomes in continuing placements as well as between continuing and disrupted placements. The analysis suggests that adoption should certainly be considered as an option for children over 5 years of age while recognizing the need for both preparation and post‐placement support. Evidence of differential outcome in continuing placements provides support for efforts to reduce the number of placements and returns home that a child at risk experiences. 相似文献