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781.
782.
What happens when a major, well publicized state-level scandal occurs? Do opinions of federal politicians improve because of relative comparisons to state politicians caught in the scandal? Do attitudes toward all politicians suffer? Little work has been done to investigate about how scandals related to one level of government affect attitudes about political actors at other levels. We investigate what happens when a major and well publicized state-level scandal occurs. Using individual-level public opinion data collected during the summer of 2006, we analyze the impact that a state-level scandal had on citizen approval of state and federal political actors, considering the mediating impact of exposure to media coverage of the scandal. Overall consumption of news coverage of state governors boosts approval of the governor relative to the president. At the same time, however, citizens exposed to negative scandalous news coverage of their governor show a decline in relative gubernatorial approval. 相似文献
783.
As urbanization expands into rural areas, an increase in the number of non-native plant species at the urban-rural interface is expected due in large part to the increased availability of propagules from ornamental plantings. A study investigating the distribution of non-native plants in the understories of riparian forests across an urban-to-rural gradient north of Columbus, GA was initiated in 2003. A significantly greater number of non-native plant species occurred at the urban sites and at one site at the urban-rural interface, where 20 to 33% of the species encountered were non-native. In contrast, at the more rural sites non-native species comprised 4–14% of the total number of species. However, the importance values of non-native species as a whole did not change significantly across the land use gradient due to the high frequency and abundance of three non-native species (Ligustrum sinense, Lonicera japonica, and Microstegium vimineum) in the majority of the watersheds. Reductions in species richness and overstory reproduction associated with these non-natives could impact long-term forest structure and ecosystem function. 相似文献
784.
The cultural context in which rural farm children are raised has a significant effect on their lives. Researchers have traditionally viewed rural environments from a deficit perspective. Yet many children demonstrate resilience even in the face of significant adversity. This article focuses on strengths of rural farming communities in providing a cultural context that supports healthy development in children. It also notes practice considerations for child welfare in small agricultural communities. 相似文献
785.
Stein LA Colby SM O'Leary TA Monti PM Rohsenow DJ Spirito A Riggs S Barnett NP 《Journal of drug education》2002,32(4):271-286
A wide range of data are obtained with self-report. Information obtained from persons using substances is generally reliable and valid, however, many studies show that some proportion of self-reports regarding substance use are inaccurate. This study examines self-reported response distortion in adolescents who received a brief intervention to reduce their smoking. Findings indicate that age and ethnicity of respondent may influence reported response distortion. Factors that appear to influence under- and over-reporting include social desirability and fear of repercussion. Response distortion does not appear to affect rated usefulness of the intervention, nor does intervention type appear to influence whether respondents thought the researcher wanted them to report less use. Results point to the need for further research regarding adolescents and response distortion. 相似文献
786.
We investigate how inequalities in political participation are shaped across generations by considering the influence of family
background-in particular, parents' education and political involvement-on political participation. We pursue this issue, first,
for individuals, investigating the effects of parental characteristics on the participatory profile of their offspring. Then,
we use what we have learned to understand how group differences in political participation-between women and men and among
Latinos, African Americans, and Anglo Whites-are rooted in the legacy of class and political background and in experiences
throughout the life cycle.
They are co-authors of The Private Roots of Public Action: Gender, Equality, and Political Participation (Cambridge: Harvard University Press, 2001) which was the co-writer of the Victoria Schuck Award of the American Political
Science Association for the best book on gender and politics of its year. 相似文献
787.
788.
Nancy Lo Ferguson 《Australian & New Zealand Journal of Statistics》1973,15(3):191-209
Given a random sample(X1, Y1), …,(Xn, Yn) from a bivariate (BV) absolutely continuous c.d.f. H (x, y), we consider rank tests for the null hypothesis of interchangeability H0: H(x, y). Three linear rank test statistics, Wilcoxon (WN), sum of squared ranks (SSRN) and Savage (SN), are described in Section 1. In Section 2, asymptotic relative efficiency (ARE) comparisons of the three types of tests are made for Morgenstern (Plackett, 1965) and Moran (1969)BV alternatives with marginal distributions satisfying G(x) = F(x/θ) for some θ≠ 1. Both gamma and lognormal marginal distributions are used. 相似文献
789.
Nancy J. Balter 《Risk analysis》1997,17(6):705-715
In some areas where oxygenated fuel programs have been implemented, there have been widespread complaints of non-specific health effects attributed to the gasoline. There are a number of hypotheses that can account for this apparent association. This paper examines the hypothesis that the use of oxy-fuel (either oxygenated gasoline or reformulated gasoline) results in exposure of the general population to one or more chemicals at concentrations that cause toxicologic injury. Although several oxygenates can be used in oxy-fuels, this analysis focuses on MTBE because it is the most widely used oxygenate and because the database of relevant toxicologic data is greatest for this oxygenate. The causal assessment is based on an evaluation of the qualitative and quantitative plausibility that oxygenated fuel-related exposures have toxicological effects, and the epidemiologic studies that directly test the hypothesis that the use of oxygenated fuels causes adverse health effects. The plausibility that chemical exposures related to oxy-fuel use cause toxicological effects is very low. This determination is based on consideration of the exposure-response and time-action profiles for relevant toxicological effects of MTBE in animals, experimental MTBE exposure studies in humans, and the possibility that the addition of MTBE to gasoline results in toxicologically significant qualitative and/or quantitative changes in gasoline-related exposures. Similarly, the epidemiologic studies of oxy-fuel exposed cohorts do not support a causal relationship between oxy-fuel use and adverse health effects. Although the data are insufficient to rule the possibility of unique sensitivity in a small segment of the population, the strength of the evidence and the availability of other more plausible explanations for the health complaints reported in association with oxy-fuels support a high degree of confidence in the conclusion that MTBE-containing oxygenated fuels are not the cause of acute toxicity in the general population. 相似文献
790.
Bridget?K.?GormanEmail author Nancy?S.?Landale 《Population research and policy review》2005,24(4):335-358
Puerto Rican children are more likely to have asthma than children in any other racial/ethnic group in the United States,
yet little research has examined the factors contributing to childhood asthma among Puerto Ricans. Using data from a representative
sample of mainland Puerto Rican children, the present study investigates the relationship between preterm birth and early-childhood
asthma (i.e., in the first years of life). The roles of other risk factors (i.e., socioeconomic and demographic characteristics,
environmental conditions, and maternal health behavior) in the development of asthma in early childhood also are considered.
The analysis reveals a relatively high rate of asthma for preterm children as well as differences between term and preterm
children in the risk factors for early-childhood asthma. Measures of socioeconomic status and the cleanliness of the home
environment are related to asthma for term, but not preterm, children; in contrast, demographic characteristics and maternal
health behavior are important risk factors for asthma among preterm children. 相似文献