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91.
SMOOTH TESTS FOR THE BIVARIATE POISSON DISTRIBUTION 总被引:1,自引:0,他引:1
A theorem of Rayner & Best (1989) is generalised to permit the construction of smooth tests of goodness of fit without requiring a set of orthonormal functions on the hypothesised distribution. This result is used to construct smooth tests for the bivariate Poisson distribution. The test due to Crockett (1979) is similar to a smooth test that assesses the variance structure under the bivariate Poisson model; the test due to Loukas & Kemp (1986) is related to a smooth test that seeks to detect a particular linear relationship between the variances and covariance under the bivariate Poisson model. Using focused smooth tests may be more informative than using previously suggested tests. The distribution of the Loukas & Kemp (1986) statistic is not well approximated by the x2distribution for larger correlations, and a revised statistic is suggested. 相似文献
92.
Workplace exposures to airborne chemicals are regulated in the U.S. by the Occupational Safety and Health Administration (OSHA) via the promulgation of permissible exposure limits (PELs). These limits, usually defined as eight-hour time-weighted average values, are enforced as concentrations never to be exceeded. In the case of chronic or delayed toxicants, the PEL is determined from epidemiological evidence and/or quantitative risk assessments based on long-term mean exposures or, equivalently, cumulative lifetime exposures. A statistical model was used to investigate the relation between the compliance strategy, the PEL as a limit never to be exceeded, and the health risk as measured by the probability that an individual's long-term mean exposure concentration is above the PEL. The model incorporates within-worker and between-worker variability in exposure, and assumes the relevant distributions to be log-normal. When data are inadequate to estimate the parameters of the full model, as it is in compliance inspections, it is argued that the probability of a random measurement being above the PEL must be regarded as a lower bound on the probability that a randomly selected worker's long-term mean exposure concentration will exceed the PEL. It is concluded that OSHA's compliance strategy is a reasonable, as well as a practical, means of limiting health risk for chronic or delayed toxicants. 相似文献
93.
The purpose of this essay is to develop a way to look at doing therapy based on (a) Wittgenstein's concept of “language game”; (b) the relationship between Wittgenstein's “private language” argument, language games, and constructivism; and (c) post-structural thinking about language, how therapy works within language, and how language works within therapy. Case material is used to illustrate the usefulness of this approach. 相似文献
94.
Rural often is viewed as a setting for study rather than an object of study. Often a priori definitions of rural are used; these definitions may bear little resemblance to residents' understanding of the concept. A cognitive mapping experiment to explore the meaning of rural is undertaken in this paper. Results indicate that urban residents could readily identify rural areas on a blank map of Pennsylvania. Their responses to the question varied, however, with some respondents indicating urban areas or writing images on the map. A discussion of these thought processes and implications from these varying responses are presented. Then, the cognitive maps are compared to three commonly accepted definitions of rural. Population density was found to best approximate the areas that urban residents perceived as rural. The paper concludes by discussing policy implications of the findings. 相似文献
95.
Modeling Benzene Pharmacokinetics Across Three Sets of Animal Data: Parametric Sensitivity and Risk Implications 总被引:1,自引:0,他引:1
Robert C. Spear Frédéric Y. Bois Tracey Woodruff David Auslander Jennifer Parker Steve Selvin 《Risk analysis》1991,11(4):641-654
Typically, the uncertainty affecting the parameters of physiologically based pharmacokinetic (PBPK) models is ignored because it is not currently practical to adjust their values using classical parameter estimation techniques. This issue of parametric variability in a physiological model of benzene pharmacokinetics is addressed in this paper. Monte Carlo simulations were used to study the effects on the model output arising from variability in its parameters. The output was classified into two categories, depending on whether the output of the model on a particular run was judged to be generally consistent with published experimental data. Statistical techniques were used to examine sensitivity and interaction in the parameter space. The model was evaluated against the data from three different experiments in order to test for the structural adequacy of the model and the consistency of the experimental results. The regions of the parameter space associated with various inhalation and gavage experiments are distinct, and the model as presently structured cannot adequately represent the outcomes of all experiments. Our results suggest that further effort is required to discern between the structural adequacy of the model and the consistency of the experimental results. The impact of our results on the risk assessment process for benzene is also examined. 相似文献
96.
ABSTRACT This study investigated the outcomes of using a consultant workshop model to help implement performance management (PM) methods in selected Chinese autism agencies. A need for improvement of educational services in Chinese autism agencies was identified. However, the theory and methods of organizational behavior management (OBM) in general and PM in particular are still foreign in the Chinese autism community. The primary research question of the current study was whether first-line teacher performance in Chinese autism agencies could be improved by the use of a consultant workshop model to train management staff to implement a PM system. Four autism agencies in different Chinese provinces participated in this study. Results demonstrated that after the implementation of the PM system through a consultant workshop model in the participating agencies, the performance of first-line teachers in these agencies improved in several important areas. The intervention appeared modestly effective. Implications of the outcome data and future directions for practitioners and researchers are discussed. 相似文献
97.
Steve Keen 《Globalizations》2017,14(6):803-809
In this brief article I explain why the expectation amongst economists that Brexit means Britain will experience significant economic losses, thanks to the reversal of the gains from specialisation, is incorrect. The background assumptions regarding comparative advantage are false and cannot inform real-world situations. However, this is not the same as to suggest Britain as a post-Brexit country will follow successful trade policies. 相似文献
98.
Denver M. Y. Brown Steve R. Bray Kevin R. Beatty Matthew Y. W. Kwan 《Journal of American college health : J of ACH》2013,61(4):234-242
AbstractObjective: To examine the effects of a Healthy Active Living (HAL) community intervention on moderate-to-vigorous physical activity (MVPA), fruit and vegetable consumption (FVC), and psychosocial mediators of physical activity among students transitioning into university. Methods: Sixty undergraduate students were assigned to reside in either the HAL community or no-treatment control residence and completed questionnaire measures at the beginning and end of the academic year. Results: Students living in the HAL community reported significantly more MVPA (F[1, 58] = 19.93, p <.001, ηp2 =.26) and greater FVC (F[1, 56] = 3.12, p =.08, ηp2 =.05) compared with controls. Participants in the HAL condition also scored significantly higher in action planning (F[1, 58] = 4.79, p <.05, ηp2 =.08), partially mediating the effect of the intervention on MVPA. Conclusion: A peer-delivered healthy lifestyles intervention targeting first-year university students appears to be effective in preserving or enhancing health behaviors and cognitions during their transition into university life. 相似文献
99.
100.
Kathleen Stacey Steve Allison Vicki Dadds Leigh Roeger Andrew Wood Graham Martin 《Australian and New Zealand Journal of Family Therapy》2001,22(4):181-188
Brief family therapy, including single session therapy, is widely used to provide a timely and responsive service for children with emotional and behavioural problems. However, there is surprisingly little information about how these children and families fare in the longer term. The brief family therapy program described here was directed toward children with problems of moderate severity. Child Behaviour Checklists (CBCL) were completed by parents before, three months after, and twelve months after therapy; 110 parents also participated in semi‐structured telephone interviews twelve months after therapy. Parents' CBCL ratings showed a significant decrease in children's problems after therapy, which were maintained over the subsequent year, although some children continued to experience difficulties. Parents generally found brief therapy a helpful experience. Ways to strengthen the preventive possibilities of brief therapy work will be identified at both a practical and conceptual level. 相似文献