管理科学研究与实践中的问题

科技对社会的影响日益加强的同时,人们也逐渐意识到科学的发展不能脱离人们对价值和伦理的判断。本质上,管理科学或运筹学仍然是一种人文科学。事实上,许多管理科学家都提倡伦理主义,主张把社会的和伦理的关注纳入传统的“理性”技术和管理决策。通过联合两者进行分析,可以拉近管理科学或运筹学和商业伦理的关系。     

识别名人与陌生人面孔的功能磁共振成像

探讨名人与陌生人身份判断的脑功能。6名被试参加实验,运用功能磁共振技术采集数据,AFNI软件进行统计处理。实验结果显示,名人面孔身份识别主要激活了额颞区和梭状回等,陌生人面孔识别主要激活了脑岛和梭状回。实验表明,熟悉名人面孔与陌生人面孔识别有其不同的区域;都有梭状回的视觉加工,但是激活的程度不同。     

不同训练方法对小学生分享行为影响的实验研究

本研究采用情境讨论、角色扮演和归因训练法对小学生分享行为进行为期两个月的训练,结果表明不同训练方法对培养小学生的分享行为都有明显作用,其中角色扮演法对小学生分享行为影响的效果最好,归因训练法次之,情景讨论法稍差;实验训练对培养小学女生分享行为的效果要明显优于对小学男生的效果,但情景讨论法对女生影响的效果优于男生,角色扮演训练对男生的影响效果要稍优于女生,但差异都不明显,而归因训练法对女生的训练效果明显地优于男生。     

基于元胞自动机的濒危植物明党参种群数量动态研究

根据3年来积累的和峨参野外实验数据,利用元胞自动机模型在计算机上模拟了濒危植物明党参(Changium smyrnioides)的种群生长动态,并选取同科的峨参(Anthriscus sylvestris)作为对照种进行比较分析。模拟结果显示,两个物种在种群中的个体数量均随生殖率m和可利用生境比率h的增大而增加,当生殖率大于0.6732时明党参种群才可在模拟时间尺度上(100年)保持不衰退;峨参生殖率的变化则不会使种群衰退,当m>9.15时,种群密度就不再增加。明党参的最小生境需求值小于峨参。明党参在h大于0.7%时,种群密度不再增加,即明党参最多只能利用生境的0.4%,峨参则可占据生境中位置的81.9%。综合分析模拟参数和结论,我们认为:明党参偏向于K策略,峨参偏向于r策略。本文相关资料对于确定明党参相应的保护措施有重要参考价值。研究元胞自动机在生态学上的初步模拟可以为将来进行更加深入的研究奠定基础。     

Does home internet use influence the academic performance of low-income children?

HomeNetToo is a longitudinal field study designed to examine the antecedents and consequences of home Internet use in low-income families (http://www.HomeNetToo.org). The study was done between December 2000 and June 2002. Among the consequences considered was children's academic performance. Participants were 140 children, mostly African American (83%), mostly boys (58%), and most living in single-parent households (75%) in which the median annual income was 15,000 (U.S. dollars) or less. Average age was 13.8 years. Ages ranged between 10 and 18 years, Internet use was continuously recorded, and multiple measures of academic performance were obtained during the 16-month trial. Findings indicated that children who used the Internet more had higher scores on standardized tests of reading achievement and higher grade point averages 6 months, 1 year, and 16 months later than did children who used it less. Older children used the Internet more than did younger children, but age had no effect on the nature or the academic performance benefits of Internet use. Implications for the digital "use" divide are discussed.     

Work organization, economic inequality, and depression among nursing assistants: a multilevel modeling approach

To investigate the relationships among the nursing home work environment, emotional strain, and depression in Nursing Assistants in Ohio and West Virginia, this cross-sectional study was conducted with 395 Nurse Assistants in 49 nursing homes in Ohio and West Virginia. Organizational attributes were measured independently at the individual and organizational levels. Multilevel modeling techniques were used to analyze the data. Our methods examined nursing home organizational structure (ownership type, managerial style), and work organization (emotional strain) was examined in relation to the prevalence of depression among nursing assistants. Our findings suggest workplace emotional strain and age are associated with increased odds of depression. Implications of our work include that work in nursing homes for the environment it fosters has a strong effect on emotional strain and depression among Nursing Assistants.     

呼唤人性的医学——对医学人性化和人文化回归的企盼

当前 ,在医学领域尤其是临床医疗领域存在着严重的“人性淡漠”趋势 ,这一现象令人十分担忧 ,它不仅将严重阻碍医学自身的健康发展 ,而且会产生恶劣的社会影响。列举了当今医界带有普遍性的“人文精神贫乏症”的种种表现 ,在此基础上 ,深入剖析了这一现象背后的历史与现实、社会与个人的诸多原因。最后发出了“人性医学回归”的强烈呼唤 ,并提出了一些具体的且有现实意义的对策措施。     

Dislocations in Bi-Pb-Sr-Ca-Cu-O superconductors

Abstract

Dislocations and dislocation networks in superconducting Bi-Pb-Sr-Ca-Cu-O have been observed by means of TEM, confirming that this compound is a layer structure with low stacking fault energy. On the basal plane, dislocations and dislocation networks dissociate into partial dislocations and partial dislocation networks. However, the dissociation of [010] dislocations is hardly observed, which is related to the structural characteristics of the compound.     

任务框架及利他人格对社会折扣的影响

与自我存在一定社会距离的他人获得收益或遭受损失都会给自我带来一定的效用,这种效用随着与他人间社会距离的增加而减少,该现象被称为社会折扣。本研究采用情境式选择滴定程序,探索并比较了“为他人得益而放弃自我得益”(NG-G)、“为他人不失而放弃自我得益”(NG-NL)、“为他人得益而承担自我损失”(L-G)以及“为他人不失而承担自我损失”(L-NL)4种任务框架下的社会折扣程度。结果发现：(1)4种框架下,指数模型均比双曲模型更好地描绘了被试的社会折扣规律;(2)任务框架影响社会折扣程度,“为他人不失”框架下(含NG-NL、L-NL)的折扣程度比“为他人得益”框架下(含NG-G、L-G)低;(3)任务框架与社会距离的交互作用影响社会折扣程度。随着社会距离增加, NG-G与NG-NL框架下折扣程度的差异逐渐变小, L-G与L-NL框架下折扣程度的差异也逐渐变小;(4)社会距离与利他人格的交互作用显著,高低利他人格者的社会折扣程度只在社会距离较远时存在显著差异。上述结果表明,个体不仅存在自我损失规避倾向,也存在不同程度的他人损失规避倾向。