论基础公理与反基础公理

"循环并不可恶"。本文在此基础上讨论基础公理和反基础公理。首先指出基础公理原本就是一条有争议的公理;第二,说明基础公理的局限性;第三,详细论述反基础公理家族中的三个成员,并给出它们两两不相容的一个证明;第四,分析反基础公理导致集合论域在V=WF上不断扩张的方法,并指出这种扩张的方法与数系扩张的方法相同;最后结论:良基集合理论(ZFC)与非良基集合理论(ZFC~-+AFA(或者ZFC和ZFC~-+FAFA或者ZFC和ZFC~-+SAFA))之间的关系类似于欧几里得几何学与非欧几何学之间的关系。     

Effect of electron concentration on the Laves phase stability of NbCr2–Ni produced by powder metallurgy

The powder metallurgy technology of mechanical alloying followed by hot-pressing consolidation has been used to obtain NbCr₂–Ni Laves phases. High-purity Nb, Cr, and Ni crystalline powders were milled for periods up to 35 h. These powders were vacuum sintered at 1250°C for 0.5 h under 45 MPa. The phase transformations of NbCr₂–Ni Laves phases have been investigated by X-ray diffraction. The grain size decreases and the microstrain increases with increased Ni content. Different phase transformations were observed from NbCr₂–Ni intermetallics. It is found that the electron concentration and phase stability correlation is obeyed in the Nb–Cr–Ni systems. However, the electron concentration corresponding to the C15/C14 phase transition is found to move to a higher value (i.e. 6.103) than the predicted one (i.e. 5.88) in the literature.     

Culture,social class,and independence–interdependence: The case of Chinese adolescents

Social class demarcates sociocultural environments differing in the relative abundance and scarcity of resources, which in turn differentially afford independent and interdependent psychological processes. The relationships between social class and psychological processes are well documented in Western populations but less so elsewhere. Examining such a relationship is particularly important in China, with its unique historical and sociocultural issues surrounding social class. This research examined the relationship between social class and independence–interdependence among Chinese adolescents (N = 1184). Findings were consistent across a diverse array of psychological processes implicated by independence–interdependence: Participants with well‐educated parents experienced more socially disengaging emotions and a higher level of self‐esteem, and were more inclined toward dispositional attribution and focused attention, compared to participants with less well‐educated parents. These findings highlight the cross‐cultural commonality in the relationship between social class and independence–interdependence.     

Visual field asymmetry in attentional capture

The present study examined the spatial distribution of involuntary attentional capture over the two visual hemi-fields. A new experiment, and an analysis of three previous experiments showed that distractors in the left visual field that matched a sought-for target in color produced a much larger capture effect than identical distractors in the right visual field, revealing a visual field asymmetry in color-based contingent capture. On the other hand, abrupt onsets in the two hemi-fields did not differ in the magnitude of their capture effect, indicating a symmetric distribution of onset capture. The different spatial patterns for contingent capture and onset capture reveal differences between the two types of attentional capture, possibly indicating differences in the underlying brain mechanisms.     

垄断企业高管薪酬:不足还是过度?

垄断的"放大效应"使垄断企业业绩对高管努力的敏感度大干非垄断企业业绩对高管努力的敏感度.本文用模型证明了,当高管能力相同、努力程度相同时,资产规模相同的垄断企业的业绩大干非垄断企业的业绩,主要是因为垄断企业天生被赋予的垄断优势.因此,当垄断企业和非垄断企业业绩相同时,支付给垄断企业高管的薪酬应该低于支付给非垄断企业高管的薪酬.论文还用2008年上市公司的数据验证了垄断的"放大效应",检验了当前垄断企业高管薪酬水平的合理性,最终发现目前垄断企业的高管薪酬相对于其业绩来说是过高的,存在激励过度问题.     

宗教的起源:适应或偶然?

如果把宗教视作一种和生物进化类似的自然现象,那么它就应该有起源和发展的过程。近年来,探索这个意义上的宗教起源已经成为了进化心理学等认知科学领域的一个研究方向。一部分科学家认为,宗教可能是作为促进了人的生存和繁殖机会的一种适应,在自然选择的过程中进化了出来。另一部分科学家则认为宗教是意识进化的一个副产品。或者,宗教的起源是适应和副产品的综合产物。     

A Comparison of Multilevel Imputation Schemes for Random Coefficient Models: Fully Conditional Specification and Joint Model Imputation with Random Covariance Matrices

Abstract

Literature addressing missing data handling for random coefficient models is particularly scant, and the few studies to date have focused on the fully conditional specification framework and “reverse random coefficient” imputation. Although it has not received much attention in the literature, a joint modeling strategy that uses random within-cluster covariance matrices to preserve cluster-specific associations is a promising alternative for random coefficient analyses. This study is apparently the first to directly compare these procedures. Analytic results suggest that both imputation procedures can introduce bias-inducing incompatibilities with a random coefficient analysis model. Problems with fully conditional specification result from an incorrect distributional assumption, whereas joint imputation uses an underparameterized model that assumes uncorrelated intercepts and slopes. Monte Carlo simulations suggest that biases from these issues are tolerable if the missing data rate is 10% or lower and the sample is composed of at least 30 clusters with 15 observations per group. Furthermore, fully conditional specification tends to be superior with intraclass correlations that are typical of crosssectional data (e.g., ICC?=?.10), whereas the joint model is preferable with high values typical of longitudinal designs (e.g., ICC?=?.50).     

语言的群体间偏差研究

个体在用语言来描述他人的行为时,会因为描述对象的群体种类不同而有偏差,具体表现为在描述群体内成员的积极行为和群体外成员的负向行为时,会使用较高抽象水平的词;在描述群体外成员的积极行为和群体内成员的负向行为时,会使用较低抽象水平的词。这种抽象水平的差异由语言范畴模型来具体表明。Maass等人把这种描述上的偏差命名为语言的群体间偏差。并认为在这一现象下有两种机制：动机机制和认知机制,研究表明认知机制能解释大部分语言的群体间偏差现象,而动机机制会在群体内形象受到威胁时发挥作用。