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31.
Allan Mazur 《Journal of sex research》2013,50(3):281-303
Men place more importance on the physical attractiveness of women than women do on the physical attractiveness of men. As a result, women's social opportunities are more affected by their physical beauty than are men's, so that women are under more pressure to conform to an ideal of beauty. Although standards of female beauty are not as arbitrary as is sometimes claimed, they do vary greatly over time and across cultures. Modern institutions of advertising, retailing, and entertainment now produce vivid notions of beauty that change from year to year, placing stress upon women to conform to the body image currently in vogue. The best known of these beauty standards are the “bosom mania” of the 1950s and 1960s and the current trend toward slenderization. As women attempt to adapt to each of these changes, a minority overadapt, sometimes to the point of incapacitation. Among these over‐adaptations have been hysteria, early in the century, which was an exaggeration of the fragile feminine ideal of that time; bosom anxieties of the 1950s and 1960s, when women worried if their breasts were sufficiently large; and anorexia and bulimia today. 相似文献
32.
We present results of the first longitudinal study of long‐term outcome correlates of sexual experiences in early childhood (“sex play”). Two hundred children participated in the UCLA Family Lifestyles Project (FLS), beginning at birth to the current wave of data collection at ages 17–18. For most of the current analyses, data were complete for 96 of the young men and 88 of the young women. Participants were assessed on a wide range of adjustment variables devised for the FLS and the UCLA Adolescent Growth Study. Participation in early childhood sex play was determined by parent self‐reports at child's age three and age six. Forty‐eight percent of children were reported to have engaged in interactive sex play prior to age six. Using socioeconomic status, sex of participant, family attitudes toward sexuality, and family type (conventional two‐parent versus nonconventional) as controls, no significant long‐term associations were found between exposure to sex play and adjustment at ages 17–18. Sexual liberalism/conservativism in family of origin was significantly associated with sexual liberalism I conservativism at ages 17–18. These results converge on earlier cross‐sectional retrospective work, suggesting that the experience of childhood sex play in itself is unrelated to long‐term adjustment. 相似文献
33.
"Counting' power indices for games with a priori unions 总被引:1,自引:0,他引:1
Marcin Malawski 《Theory and Decision》2004,56(1-2):125-140
34.
When a finite population is to be stratified, one of constraints in stratification is that sample sizes from strata may not be greater than the corresponding stratum sizes and may not be smaller than two. There are several ways of treating this allocation constraint, each providing an alternative approach to stratification. In this article, it is shown that a choice of the approach has a bearing on stratification efficiency. Unfortunately, no particular approach out of the four compared is shown to be the most efficient for each population studied. In addition, the approaches are applied to stratify a real population. 相似文献
35.
This study examined the impact of motion pictures about the family on viewers' attitudes about family life and sexual orientation. Viewers were randomly assigned to view either Father of the Bride II (control group) or Object of My Affection (treatment group). Viewers' attitudes toward nontraditionalism and homosexuality were assessed before and after viewing their respective film. Treatment and control groups significantly differed in their attitudes toward nontraditionalism, but did not significantly differ in their attitudes toward homosexuals after viewing their respective films. However, the treatment group experienced more favorable attitudes toward homosexuals than the control group after viewing the film. Gender differences were also observed. Men were less tolerant of homosexuals and held fewer nontraditional beliefs about the family than women. Implications and discussion follow. 相似文献
36.
Domingos M. Cardoso Marcin Kamiński Vadim Lozin 《Journal of Combinatorial Optimization》2007,14(4):455-463
Independent sets, induced matchings and cliques are examples of regular induced subgraphs in a graph. In this paper, we prove
that finding a maximum cardinality k-regular induced subgraph is an NP-hard problem for any fixed value of k. We propose a convex quadratic upper bound on the size of a k-regular induced subgraph and characterize those graphs for which this bound is attained. Finally, we extend the Hoffman bound
on the size of a maximum 0-regular subgraph (the independence number) from k=0 to larger values of k. 相似文献
37.
Pawe??Micho?apEmail author Aneta?Sikora Maria?Kelm Marcin?Sikora 《Urban Ecosystems》2017,20(6):1339-1345
Based on current research the agglomerations are potentially desirable habitats for bumblebees. However, the relationship between the biodiversity of these bees and the green areas where they live is poorly understood. The aim of the study was to estimate the influence of green areas (ranging from 8 to 102 ha) of big cities on bumblebee species richness, composition, and the relative number of these insects. The studies were conducted within the administrative borders of the city of Wroc?aw (Poland) in 2011–2012 in 12 green areas such as parks, cemeteries and other places with trees and shrubs. Species richness and abundance of bumblebees was determined by direct observation during 30 min. The gathered materials were used to calculate how areas of urban green space affected qualitative and quantitative bumblebee community structure. In total, 13 species of bumblebees (Bombus Latr.) were recorded, of which 3 belonged to cuckoo bumblebees (Psithyrus subgenus). The share of the most similar groups was congregated in green areas not smaller than 30 ha. This was proved by analysis of qualitative structure (Sørensen index), quantitative structure (Renkonen index), and qualitative-quantitative structure (Cody’s index). The number of bumblebee species in the surveyed green areas (r = 0.7497) was decisive for the arrangement of the mutual similarity of group structure. Green urban areas should be created in a size of at least 30 ha. Such sites provide conditions for the most diversified bumblebee species communities. Sites smaller than 30 ha can play an important role as refuges, and allow migration to all pollinators. 相似文献
38.
Amy G. Mazur 《Journal of Women, Politics & Policy》2017,38(1):64-83
ABSTRACTThis article proposes an analytical construct, based on feminist and non-feminist policy studies, to be eventually used in the systematic study of feminist policy in practice in postindustrial democracies. The measurement allows for the analysis of democracy, representation, and symbolic reform in terms of the array of policy actors who come forward during the crucial implementation and evaluation stages, the policy instruments that are used in these phases, and policy outcomes. As the article argues, developing this analytical measurement constitutes the essential first step in the emerging research cycle on feminist policy postadoption in a comparative perspective. 相似文献
39.
Marcin Kozak 《统计学通讯:模拟与计算》2013,42(4):901-910
The problem of a sample allocation between strata in the case of multiparameter surveys is considered in this article. There are several multivariate sample allocation methods and, moreover, several criteria to deal with in such a case. A maximum coefficient of variation of estimators of the population mean of characters under study is taken as the optimality criterion. This article contains a study on a group of the methods that are easy to implement and do not need complex numerical computation; however, they all are approximate. Five such methods are presented and compared using a simulation study. Finally, it is shown which methods should be considered when designing a survey in which the multivariate sample allocation is to be involved. 相似文献
40.
In this article, a choice of the optimum sampling design to study a finite population is studied. Three sampling schemes are compared, viz., Sunter's procedure of unequal probability sampling, stratified sampling under optimum stratification, and simple random sampling without replacement. The comparison is made against a background of various correlation between stratification and survey variables and various variability in the variables. Under weak correlation and large variability, stratification appeared to be more efficient than Sunter's procedure. Under strong correlation and/or low variability in the variables, the latter procedure was the most efficient. Simple random sampling was usually the least efficient. 相似文献