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布赖恩·罗伯茨 《中国农业大学学报(社会科学版)》2008,25(1):52-60
文章关注于发展中国家城市化的当代模式,并探讨这些模式对农村发展的涵义。发展中国家的不同国家和地区之间的城市化并不是统一的模式,且当代城市化模式所导致的在农村-城市联系中经济和社会多样性的程度是前所未有的。移民和分权是城市化在微观层次的两方面。城市化必然意味着或是永久的或是暂时的从农村流向城市的人口的净转移,而这些移民也对农村地区不平等产生了影响。而发展中国家城市化的一个新特征表现在它是伴随着行政的分权而发生的。分权的一个结果是使影响地方发展的行动者增加,另一个结果是没有任何一个人可以垄断资源或外部联系和信息。 相似文献
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Julia R. Heiman Brian A. Gladue Carl W. Roberts Joseph LoPiccolo 《Journal of marital and family therapy》1986,12(2):163-174
Clinical literature has noted numerous past and current psychosocial factors characteristicof sexually dysfunctional individuals. However, there is almost no empirical documentation of factorsdiscriminating sexually functional from dysfunctional couples. The present study compared the responses of 94 clinical couples accepted for sex therapy with 110 nonclinical couples, selected from the same community. The couples were in their mid-30s, married an average of 12 years, middle income, rather well educated, and over 75% had at least one child. Individuals completed a 517-question Personal History Questionnaire (PHQ), and sex and marital defensiveness scales. The PHQ wasclinically and empirically developed, resulting in 54 internally consistent scales. Major analyses tested the discriminating power of past and current PHQ scales. The best discriminators were sexual functioning scales, historical and affective scales for women, and current and fantasy scales for men. Several surprising results appeared, including the importance of first coitus and the lack of importance of marital satisfaction, communication and sexual history scales. Four conclusionswere discussed relevant to the separation of sex and relationship satisfaction, the separation of sexualfunctioning and sexual satisfaction, and the differential impact of sexual problems on men and women. 相似文献
45.
In this paper, we introduce non-centered and partially non-centered MCMC algorithms for stochastic epidemic models. Centered
algorithms previously considered in the literature perform adequately well for small data sets. However, due to the high dependence
inherent in the models between the missing data and the parameters, the performance of the centered algorithms gets appreciably
worse when larger data sets are considered. Therefore non-centered and partially non-centered algorithms are introduced and
are shown to out perform the existing centered algorithms. 相似文献
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The purpose of this study is to develop an instrument for measuring the quality of life of university students, and to report its validity and reliability. The study used a representative sample of undergraduate and graduate students in the faculty of education at a major Canadian university. The construct validity of the scales was assessed by Piazza's technique for the analysis of attitude items. The findings supported conceptualizing the quality of life of university students in four dimensions including Positive Affect, Interaction with Students, Interaction with Professors, and Negative Affect. The alpha reliabilities of these scales ranged from 0.75 to 0.93. Some potential applications of this instrument for understanding educational attainment, as well as for the evaluation of university departments and faculties, are mentioned. 相似文献
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Mary Roberts Smith M.S. 《Journal of the American Statistical Association》2013,108(31):219-262
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Topics in Microbial Risk Assessment: Dynamic Flow Tree Process 总被引:5,自引:0,他引:5
Microbial risk assessment is emerging as a new discipline in risk assessment. A systematic approach to microbial risk assessment is presented that employs data analysis for developing parsimonious models and accounts formally for the variability and uncertainty of model inputs using analysis of variance and Monte Carlo simulation. The purpose of the paper is to raise and examine issues in conducting microbial risk assessments. The enteric pathogen Escherichia coli O157:H7 was selected as an example for this study due to its significance to public health. The framework for our work is consistent with the risk assessment components described by the National Research Council in 1983 (hazard identification; exposure assessment; dose-response assessment; and risk characterization). Exposure assessment focuses on hamburgers, cooked a range of temperatures from rare to well done, the latter typical for fast food restaurants. Features of the model include predictive microbiology components that account for random stochastic growth and death of organisms in hamburger. For dose-response modeling, Shigella data from human feeding studies were used as a surrogate for E. coli O157:H7. Risks were calculated using a threshold model and an alternative nonthreshold model. The 95% probability intervals for risk of illness for product cooked to a given internal temperature spanned five orders of magnitude for these models. The existence of even a small threshold has a dramatic impact on the estimated risk. 相似文献