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131.
A comprehensive framework for guiding analyses of internal migration is lacking. This study contributes to the family migration
literature in three important ways. We develop a multilevel theoretical framework emphasizing an integration of individual-,
family-, and neighborhood-level effects; introduce multilevel statistical modeling; and explicitly assess how effects of economic-based
explanatory variables vary by gender. Our data are from the Panel Study of Income Dynamics (PSID). We find that the likelihood
of a family migrating is affected by economic and non-economic factors, some of which vary by gender. We add to the dual-earner
migration literature by finding that wives are not likely to be tied-movers, but husbands are likely to be tied-stayers. Neighborhood
factors also are important to the decision to migrate.
相似文献
Steven Garasky (Corresponding author)Email: |
132.
The Continuing Legacy of the Communist Legacy? The development of family policies in Poland and the Czech Republic 总被引:1,自引:0,他引:1
This article compares family policies in Poland and the CzechRepublic in order to explain why the two countries have differentpolicies. Previous studies are right to claim that post-communistfamily policies are basically going in a refamilialist directionthat gives mothers a greater incentive to return to the home,but they tend to neglect the important differences that existbetween countries. Although previous studies were correct toemphasize the role of the anti-feminist communist legacy inexplaining this trend toward re-famialilization, it is a country'seconomic-institutional legacy that goes the farthest in explainingthe differences in policies. 相似文献
133.
The purpose of this study was to determine the degree to which a novel training program based on activities of daily living (ADL) would affect performance of ADLs, as well as the fitness of older adults. Fourteen individuals (mean age 82 years) took part in a 10-week control period followed by a 10-week ADL-based training program. Pre- and posttests included the Physical Performance Test (PPT), the Physical Functional Performance-10 (PFP-10), and the Senior Fitness Test (SFT). After the training period, improvements ranging from 7% to 33% (p<.05) were seen on the PPT and PFP-10 and on three items of the SFT. After conversion to standard scores, the magnitude of change in the PPT and the PFP10 was significantly greater (p<.05) than the magnitude of change in the SFT. These data support the idea that this novel ADL-based training program was able to facilitate improved performance of ADLs, as well as select measures of fitness among older adults. 相似文献
134.
University research administrators have been generally ignored in basic studies of research integrity. Hensley noted that research administrators are "essential... to the achievement of the specific missions of postsecondary institutions... and to science and the academic infrastructure". The following study sought to extend the scope of research on research integrity to research administrative structures with a new instrument called the Research Environment Norm Inventory or RENI. University research administrators and their professional association were targeted for data collection. Evidence suggested that research administration in the United States supports integrity in the research environment through: (1) respect for community; (2) respect for institutional boundaries; (3) professionalism; (4) respect for authority structures; (5) sensitivity to system conflicts. The study suggested that integrity structures are dictated largely by the institutional settings and environments. 相似文献
135.
Virtual Interpersonal Touch and Digital Chameleons 总被引:1,自引:0,他引:1
We studied the characteristics of hand touch with a mechanical device that approximated a handshake, and we then examined
the effect of handshake mimicry on assessment of a partner. Two participants interacted with a force-feedback joystick that
recorded each of their hand movements individually. The two participants then greeted one another by feeling the recording
of the other person’s movements via the force-feedback device. For each dyad, one of the participants actually received his
or her own virtual handshake back under the guise that it was the other person’s virtual handshake. Results demonstrated three
significant findings. First, for any given participant, a metric that took into account position, angle, speed, and acceleration
of the hand movements correlated highly within individuals across two handshakes. Second, across participants, these metrics
demonstrated specific differences by gender. Finally, there was an interaction between gender and mimicry, such that male
participants liked people who mimicked their handshakes more than female participants did. We discuss the implications of
these findings and relate them to theories of social interaction.
相似文献
Jeremy N. BailensonEmail: |
136.
This paper analyzes the cost increases due to demand uncertainty in single-level MRP lot sizing on a rolling horizon. It is shown that forecast errors have a tremendous effect on the cost effectiveness of lot-sizing techniques even when these forecast errors are small. Moreover, the cost differences between different techniques become rather insignificant in the presence of forecast errors. Since most industrial firms face demand uncertainty to some extent, our findings may have important managerial implications. Various simulation experiments give insight into both the nature and the magnitude of the cost increases for different heuristics. Analytical results are developed for the constant-demand case with random noise and forecasting by exponential smoothing. It is also shown how optimal buffers can be obtained by use of a simple model. Although the analysis in this paper is restricted to simplified cases, the results merit further consideration and study. This paper is one of the first to inject forecast errors into MRP lot-sizing research. As such it attempts to deal with one of the major objections against the practical relevance of previous research in this area. 相似文献
137.
138.
Unmet need for family planning has been a core concept in international population discourse for several decades. This article reviews the history of unmet need and the development of increasingly refined methods of its empirical measurement and delineates the main questions that have been raised about unmet need during the past decade, some of which concern the validity of the concept and others its role in policy debates. The discussion draws heavily on empirical research conducted during the 1990s, much of it localized, in‐depth studies combining quantitative and qualitative methodologies. Of the causes of unmet need other than those related to access to services, three emerge as especially salient: lack of necessary knowledge about contraceptive methods, social opposition to their use, and health concerns about possible side effects. The article argues that the concept of unmet need for family planning, by joining together contraceptive behavior and fertility preferences, encourages an integration of family planning programs and broader development approaches to population policy. By focusing on the fulfillment of individual aspirations, unmet need remains a defensible rationale for the formulation of population policy and a sensible guide to the design of family planning programs. 相似文献
139.
Designing and integrating composite networks for monitoring multivariate gaussian pollution fields 总被引:2,自引:0,他引:2
J. V. Zidek W. Sun & N. D. Le 《Journal of the Royal Statistical Society. Series C, Applied statistics》2000,49(1):63-79
Networks of ambient monitoring stations are used to monitor environmental pollution fields such as those for acid rain and air pollution. Such stations provide regular measurements of pollutant concentrations. The networks are established for a variety of purposes at various times so often several stations measuring different subsets of pollutant concentrations can be found in compact geographical regions. The problem of statistically combining these disparate information sources into a single 'network' then arises. Capitalizing on the efficiencies so achieved can then lead to the secondary problem of extending this network. The subject of this paper is a set of 31 air pollution monitoring stations in southern Ontario. Each of these regularly measures a particular subset of ionic sulphate, sulphite, nitrite and ozone. However, this subset varies from station to station. For example only two stations measure all four. Some measure just one. We describe a Bayesian framework for integrating the measurements of these stations to yield a spatial predictive distribution for unmonitored sites and unmeasured concentrations at existing stations. Furthermore we show how this network can be extended by using an entropy maximization criterion. The methods assume that the multivariate response field being measured has a joint Gaussian distribution conditional on its mean and covariance function. A conjugate prior is used for these parameters, some of its hyperparameters being fitted empirically. 相似文献
140.
Factors influencing Soay sheep survival 总被引:4,自引:0,他引:4
E. A. Catchpole B. J. T. Morgan T. N. Coulson S. N. Freeman & S. D. Albon 《Journal of the Royal Statistical Society. Series C, Applied statistics》2000,49(4):453-472
We present a survival analysis of Soay sheep mark recapture and recovery data. Unlike previous conditional analyses, it is not necessary to assume equality of recovery and recapture probabilities; instead these are estimated by maximum likelihood. Male and female sheep are treated separately, with the higher numbers and survival probabilities of the females resulting in a more complex model than that used for the males. In both cases, however, age and time aspects need to be included and there is a strong indication of a reduction in survival for sheep aged 7 years or more. Time variation in survival is related to the size of the population and selected weather variables, by using logistic regression. The size of the population significantly affects the survival probabilities of male and female lambs, and of female sheep aged 7 or more years. March rainfall and a measure of the North Atlantic oscillation are found to influence survival significantly for all age groups considered, for both males and females. Either of these weather variables can be used in a model. Several phenotypic and genotypic individual covariates are also fitted. The only covariate which is found to influence survival significantly is the type of horn of first-year female sheep. There is a substantial variation in the recovery probabilities over time, reflecting in part the increased effort when a population crash was expected. The goodness of fit of the model is checked by using graphical procedures. 相似文献