Determinants of obesity: The case of Germany

Obesity now has the rank of a global epidemic, but finds its severest expression in the economically advanced parts of the world. This study offers an interdisciplinary analysis of obesity in Germany, including socio-economic factors. In comparison to related studies, it uses a continuous BMI variable as well as an improved empirical design. The coefficient of the term for sport activities is significantly negative, and the coefficient for the age terms are significantly positive. The results for the income variable are ambiguous. Cigarette consumption does not indicate negative relationships with individual BMI-levels. No evidence was found for systematic differences in BMI between the eastern and western regions in reunified Germany.     

相对剥夺视角下我国职业教育发展的思考

职业教育在教育体系中处于不可替代的地位.职业教育在年轻人增强职业技能、获得职业资格和满足劳动力市场需求方面扮演着至关重要的角色.然而,当下我国职业教育的边缘化处境一直未得到很好的解决.职业教育一直被学生和公众认为是次等选择.其中最为重要的原因就是职业教育让学生及其家庭萌生了“相对剥夺感”.“相对剥夺感”为我们分析我国职业教育的现状及发展制约因素提供了一种新的视角和思路,对于构建职业教育良好的社会运行环境具有重要作用.     

Sleep Patterns of College Students at a Public University

Objective: The authors' purpose in this study was to determine the sleep patterns of college students to identify problem areas and potential solutions. Participants: A total of 313 students returned completed surveys. Methods: A sleep survey was e-mailed to a random sample of students at a North Central university. Questions included individual sleep patterns, problems, and possible influencing factors. Results: Most students reported later bedtimes and rise times on weekends than they did on weekdays. More than 33% of the students took longer than 30 minutes to fall asleep, and 43% woke more than once nightly. More than 33% reported being tired during the day. The authors found no differences between freshmen, sophomores, juniors, seniors, and graduate students for time to fall asleep, number of night wakings, or total time slept each night. Conclusions: Many students have sleep problems that may interfere with daily performance, such as driving and academics. Circadian rhythm management, sleep hygiene, and white noise could ameliorate sleep difficulties.     

An extended Gini approach to inequality measurement

It is well-known that, when the Lorenz curves do not cross, the ranking of distributions provided by the Gini index is identical to the one implied by the Lorenz criterion. This does not preclude inequality as measured by the Gini index to increase while the Lorenz curves cross. A suitable modification of the Gini coefficient allows the Lorenz quasi-ordering to coincide with the ranking generated by the application of unanimity over the class of extended Gini indices. Recently the Lorenz quasi-ordering and the underlying principle of transfers have come under attack, while new criteria – the differentials, deprivation and satisfaction quasi-orderings – have been proposed for providing unambiguous rankings of distributions. We suggest to weaken the principle of transfers by imposing additional restrictions on the progressive transfers, which take into account the positions on the income scale of the donors and beneficiaries. We identify the subclasses of extended Gini indices that satisfy these weaker versions of the principle of transfers and we show that the application of unanimity among these classes generate rankings of distributions that coincide with those implied by the differentials, deprivation and satisfaction quasi-orderings.      

The Impact of Socio-economic Status and Mobility on Perceived Family Functioning

Perceptions of current family functioning in relation to current household income level, educational status, social-class at birth and social mobility over the lifecourse were investigated in a group of 483 individuals at age 50. Subjective report of family functioning was assessed using the McMaster Family Assessment Device (FAD) with socio-economic information obtained from a self-report Health and Lifestyle Questionnaire. Results indicated significant relationships between household income, social mobility and FAD scores for men but not for women in this sample. For men, lower current income and downward social mobility over the lifecourse were associated with a more negative perception of family functioning. Further research is required to understand the gender differences observed and delineate cause versus effect mechanisms.     

Auditory evoked potentials as a function of sleep deprivation

Event-related brain potentials (ERPs) were studied in subjects deprived of sleep over a 48-h test period to assess the effects of different durations of continuous wakefulness on ERP components and to determine whether changes in the ERP components were related to changes in performance. Forty subjects were randomly assigned to either an experimental (sleep deprived) group (n = 30) or a control (not sleep deprived) group (n = 10). For the experimental subjects, ERP and performance measures were obtained in four-h test blocks throughout the 48-h period. Performance was assessed using the Walter Reed performance assessment battery. The control subjects were tested at the same times except during designated sleep periods. Both performance and evoked potential measures showed systematic changes over the experimental test period in association with sleep deprivation, time of day, and repeated testing. The latency of the N2 component of the evoked potential covaried with throughput measures on the performance assessment battery across the 12 four-h test blocks of the experiment. These data suggest that ERPs reflect central processes that change across the sleep deprivation period and that ERP measures might be useful in assessment and prediction of performance degradation under adverse conditions such as sleep loss.     

电商技术、动态能力与小农户增收

电商技术作为数字经济催生的新业态,成为推动小农户增收的重要途径。基于陕南地区实地调研数据,使用Tobit回归模型分析电商技术对小农户增收的影响,利用条件分位数回归模型分析小农户电商技术采纳增收情况的异质性,利用中介效应模型剖析电商技术采纳促进小农户收入中的作用机制。研究结果表明：电商技术采纳对小农户增收具有显著的促进作用,这种促进作用呈波动变化;电商技术采纳能够有效缩小小农户收入的不平衡性,这种影响呈现先增后减的特征;电商技术通过提高小农户的动态能力促进其收入增加,通过提高知识获取能力、整合利用能力缩小小农户收入不均衡。在此基础上,提出通过强化地方政府对电商技术采纳的重视程度、提升小农户动态能力等举措来增加小农户收入、促进收入均衡等对策建议。     

Motivating Auto Safety Belt Wearing in Industrial Settings:

Employees at an industrial plant (n = 141) participated in 40-minute safety belt "awareness sessions," which for some groups included opportunities to sign buckle up pledge cards. The duration of the pledge period was one week, one month, or three months for different groups of approximately 35 employees each. The awareness sessions, alone or with pledge cards, yielded a three-fold increase in safety belt use (from approximately 20% to 60%), which was sustained over the 13 weeks of post-session observation. While most employees signed pledge cards regardless of the pledge duration, pledging did not produce greater increases in safetey belt use than the awareness sessions without pledge cards. Further, pledge duration had no differential effect on likelihood of signing, or subsequent compliance. The usual white/blue-collar difference was found, with white-collar employees showing higher rates of safety belt use throughout the study. The results suggest strongly that an "intrinsic control" strategy of raising awareness and increasing personal commitment to buckle up can substantially increase safety belt use. The application of this approach as a cost-effective component of an overall program to increase safety belt use is discussed.     

婚姻挤压下农村流动人口的生育性别偏好——基于相对剥夺感视角的分析

中国的出生性别比偏高持续了三十年,婚姻挤压问题日益凸现,大规模的城乡人口流动则加剧了婚姻挤压问题及其社会影响的严重性与复杂性。受制度与非制度因素影响,农村流动人口在城市处于社会底层,易遭遇成婚困难、诱发相对剥夺感,可能对生育偏好产生重要影响。本文基于相对剥夺感视角,对2009年福建省X市外来农村流动人口调查数据的分析发现,婚姻挤压对农村流动人口的生育性别偏好的观念与行为均无显著影响,但相对剥夺感对生育性别偏好行为有显著影响。本研究有助于理解婚姻挤压与相对剥夺感对农村流动人口生育性别偏好演化的特殊作用,对国家调整生育政策、提高流动人口计生服务与管理、促进性别平等有一定借鉴意义。