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This study examines deterrence theory in light of three questions. First, is there an inverse relation between crime rates and maximum statutory penalties? Second, is there an inverse relation between crime rates and maximum penalties as perceived by potential offenders? Third, what is the accuracy of those perceptions? Classical versions of deterrence theory seemingly assume that the perceptions of potential offenders are substantially accurate, but the present findings (based on a survey of adult Tucson residents) show only a positive correlation (not absolute agreement) between statutory and perceived maximums. Yet there is a substantial inverse relation among types of crimes between statutory maximums (actual or perceived) and crime rates. However, that relation becomes problematic when public disapproval of criminality is controlled because of the collinearity between that aspect of social condemnation and the statutory maximums. 相似文献
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Dallas M. Hyde Robert P. Bolender Jack R. Harkema Charles G. Plopper 《Risk analysis》1994,14(3):293-302
Recent advances in quantitative morphology provide all the tools necessary to obtain structural information in the lung that can be quantified and interpreted in the three-dimensional world of toxicology. Structural hierarchies of conducting airways and parenchyma of the lung provide: (1) numbers of cells per airway, lobe, or lung; (2) surface areas of cells, airways, and alveoli; (3) length of airways and vessels; and (4) volumes of cells, alveoli, airways, vessels, and individual lobes or the entire lung. Unbiased sampling of these subcompartments of the lung requires fractionation of lobes or individual airways. Individual airways of proximal and distal generations are obtained by airway microdissection along one axial pathway and comparisons made between airway generations. Vertical sections of selected airways are used to sample epithelium and interstitium. Using this unbiased approach of quantitative morphology, we have shown that inhalation of low ambient concentrations of ozone ([O3 ]0.15 ppm) near or at the United States National Ambient Air Quality Standard (NAAQS) (0.12 ppm O3 ) induces significant alterations in bronchiolar epithelium and interstitium in nonhuman primates but not rats. The alterations do not appear to be concentration- or time-dependent, thereby bringing into question the current NAAQS that may be at or above the threshold for distal airway injury in primates. Unbiased morphometric methods are critical in a quantitative evaluation of toxicological injury of mammalian tracheobronchial airways. 相似文献
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‘Land to the tiller’ is woven intimately into the ideological and institutional fabric of the United States. Yet in the late nineteenth century tenancy and landlordism were endemic. Thereafter, the agricultural ladder metaphor was popularized to depict the mobility ‘rungs’ by which tenants could climb to full ownership. Tenancy persisted and even grew, however, until basic structural features of U.S. agriculture changed during and after the 1930s. Though empirical evidence that the ladder functioned as hypothesized is lacking, it appears to have served ideologically to prepare the nation for part-owner-operatorship — the ascendant tenure form in the new structure of agriculture. An analysis of the historical literature and agricultural census data from 1900 to 1978 is presented to support this interpretation. 相似文献
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Jack C. Kiefer 《Revue canadienne de statistique》1981,9(1):1-10
The design of statistical experiments, as developed by R. A. Fisher and his followers, often used combinatorial structures that yielded simple calculation of estimates and/or symmetric variances and covariances. Examples are block designs with balance, regression experiments with equally spaced observations, etc. More recently, considerations of optimality (choosing a design that achieves most accurate inference in some sense) have sometimes justified the traditional designs, but have sometimes led to new combinatorial investigations. Illustrations are given. 相似文献
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The authors draw on their experiences as members of EU-funded projects for training social workers in post-communist countries to reflect on developments in social work education there and in the United Kingdom. They argued that the emergence of social work in Central and Eastern Europe has a double agenda—to improve professional skills and values in the public services, and to contribute to the strengthening of a democratic and participatory civil society. Hence it is concerned both with changing the organizational culture and practices of the official social services, and with promoting voluntary organizations, community associations and service-user groups. Training in partnership, negotiation, networking and empowerment is as relevant as the teaching and learning of professional competences. This double agenda leads to tensions, both within universities and in various parts of the organizational systems in which social workers are employed. But these issues are not fundamentally different from the ones still being struggled over in the UK context. Similar issues over the respective roles of official social control and the authoritative enforcement of responsibilities, and empowerment and participation among excluded and deprived communities, are central to British social work education also. 相似文献