Optimal design of complex experiments with qualitative factors of influence

A complex experiment with qualirarive factors influencing the outcome of the experiment can be seen as a general ANOVA setup. A design of such an experiment will be the assignment at which of the possible levels of the factors the actual experiment should be performed. In this paper optimal designs of such experiments will be characterized with respect to three different optimality criteria including the so called uniform optimality of a design. The possible applications of the main optimization result providing these characterizations can be used to more general experiments. The particular results on these generalizations will be indicated at the end of this paper.     

Sexual Frequency and the Stability of Marital and Cohabiting Unions

Prior research found that lower sexual frequency and satisfaction were associated with higher rates of divorce, but little research had examined the role of sexual activity in the dissolution of cohabiting unions. We drew upon social exchange theory to hypothesize why sexual frequency is more important in cohabitation: (a) cohabitors' lower costs of finding sexual alternatives, (b) cohabitors' lower barriers to ending the relationship in the form of union‐specific economic and noneconomic capital, and (c) cohabitors' higher expectations for sexual activity. Using the National Survey of Families and Households (N = 5,902), we examined the relationship between sexual frequency and union dissolution. Results indicated that low sexual frequency was associated with significantly higher rates of union dissolution among cohabitors than married couples.     

Economics of Disaster Risk,Social Vulnerability,and Mental Health Resilience

We investigate the relationship between exposure to Hurricanes Katrina and/or Rita and mental health resilience by vulnerability status, with particular focus on the mental health outcomes of single mothers versus the general public. We advance a measurable notion of mental health resilience to disaster events. We also calculate the economic costs of poor mental health days added by natural disaster exposure. Negative binomial analyses show that hurricane exposure increases the expected count of poor mental health days for all persons by 18.7% (95% confidence interval [CI], 7.44–31.14%), and by 71.88% (95% CI, 39.48–211.82%) for single females with children. Monthly time‐series show that single mothers have lower event resilience, experiencing higher added mental stress. Results also show that the count of poor mental health days is sensitive to hurricane intensity, increasing by a factor of 1.06 (95% CI, 1.02–1.10) for every billion (U.S.$) dollars of damage added for all exposed persons, and by a factor of 1.08 (95% CI, 1.03–1.14) for single mothers. We estimate that single mothers, as a group, suffered over $130 million in productivity loss from added postdisaster stress and disability. Results illustrate the measurability of mental health resilience as a two‐dimensional concept of resistance capacity and recovery time. Overall, we show that natural disasters regressively tax disadvantaged population strata.     

基于单片机AT89C51的全自动变频恒压供水系统

介绍了一种新型的变频恒压供水系统.该系统根据供水管网的用水情况,调整水泵投入台数及转速,实行全自动恒压供水,达到高效节能的目的;其水泵用变频器软启动,对电网无冲击,能延长水泵的使用寿命.     

“生产的自然条件”与生产力发展的二重性——析马克思主义生产力理论之生态文明视角

马克思的生产力理论具有双重视角。唯物史观所谓的"生产力标准",是立足于工业文明的视角,在不考虑"生产的自然条件"前提下而得出的价值观;因此,它尽管赋有"决定历史发展的终极动力"地位,毕竟只能在普遍性的意义上存在。而在对现实的生产力发展模式的研究中,马克思立足于后工业文明的生态文明视角,创立了"生产的自然条件"范畴,并据此界定了生产力发展的现实意义:生产力能否实现与"生产的自然条件"之良性结合。这就为人类从工业文明的生产方式转型为生态文明的生产方式指明了路向。     

甘洛县新市坝镇尔苏藏族的琅玕比研究

"琅歼比"又称"还山鸡节",是川西南尔苏藏族时本族一个重要传统节日名称的汉语音译.该节日定期举行于每年的农历九月初一,主题是敬奉山神以及历代先祖.本文以甘洛县新民村尔苏藏族的"琅矸比"为例.通过民族学田野实地考察与访谈并结合相关文献记载,指出该习俗系尔苏藏族远古时期万物有灵的多神崇拜的文化遗存,认为"琅玕比"反映了人与自然和谐相处理念.     

论重大自然灾害作为合同免责事由的原因力

重大自然灾害在合同法上被界定为不可抗力，作为法定的免责事由而免除当事人合同不履行的法律责任。但司法实践中却可能存在诸多的因素导致合同不履行，重大自然灾害可能不是唯一的合同不履行的原因，故在重大自然灾害背景下探讨重大自然灾害与合同不履行之间的原因力关系，对司法实践中处理与重大自然灾害有关的合同纠纷案件具有重要的现实意义。     

财政扶持政策对西部地区农民参加新农村合作医疗的影响——基于自然实验的研究途径

本文将对西部农民参加新农村合作医疗的财政扶持政策的实施作为一个自然实验,应用微观经济计量方法分析了财政扶持政策对西部农民参加新农村合作医疗的影响。研究结果表明,与2004年相比,2006年西部农民参加新农村合作医疗的概率增加了96.46%,说明针对西部农民参加新农村合作医疗的财政扶持政策作用效果显著。     

Adolescent Victims of Natural Disasters: A Phenomenological Study on Lived Experiences and Behaviors Displayed after a Crisis

This qualitative study explored lived experiences and behavioral changes among 15 adolescent victims of natural disasters utilizing the behaviorism perspective. Volunteer adolescent victims participated in a semi-standardized open-end interview, and data were coded using pattern recognition, theme, and content analysis. Results identified that participants' most prevalent themes for behavioral changes were isolation, social withdrawal, increased arguments with family and friends, avoid relationships, and over-protectiveness. Prevalent themes for lived experiences were moving to a new home, changing schools, and mother or father lost job. The majority of the participants reported hurricanes as their natural disaster experience. In conclusion, adolescent victims reported multiple behavioral changes that were a result of a natural disaster such as hurricanes. Likewise, these victims reported facing many lived experiences after a natural disaster occurrence.     

Optimal designs for exponential regression

This paper is concerned with the optimal design problem for the particular case of non-linear parametrisation:the parameters to be estimated are included in exponents.Some properties of locally optimal designs as functions of estimated parameters are investigated and a table of such designs in given.We consider also designs to be optimal in the sense of minimax approach.