托马斯伦理学中的柏拉图主义因素--论托马斯对synderesis与conscientia的区分

托马斯伦理学总体上看虽然主要源于亚里士多德,但这并不排除它在个别理论问题上有其他理论渊源.据此笔者认为,托马斯伦理学中也不乏柏拉图主义因素.本文一方面试图厘清托马斯对于synderesis与conscientia所作的区分,另一方面深人审视这种区分的历史渊源,以期从一个侧面把托马斯伦理学中的柏拉图主义因素彰显出来.     

多维项目反应理论补偿性模型参数估计:基于广义回归神经网络集合

运用广义回归神经网络(GRNN)方法对小样本多维项目反应理论(MIRT)补偿性模型的项目参数进行估计,尝试解决传统参数估计方法样本数量要求较大的问题。MIRT双参数Logistic补偿模型被设置为二级计分的二维模型。首先,模拟二维能力参数、项目参数值与考生作答矩阵。其次,把通过主成分分析得到的前两个因子在每个题目上的载荷作为区分度的初始值以及题目通过率作为难度的初始值,这两个指标的初始值作为神经网络的输入。集成100个神经网络,其输出值的均值作为MIRT的项目参数估计值。最后,设置2×2种(能力相关水平:0.3和0.7; 两种估计方法:GRNN和MCMC方法)实验处理,对GRNN和MCMC估计方法的返真性进行比较。结果表明,小样本的情况下,基于GRNN集成方法的参数估计结果优于MCMC方法。     

Romantic Crushes Promote Variety‐Seeking Behavior

Consumers making repeat consumption choices often need to decide whether to stick to their favorite option or to select something different. Understanding the situational factors that influence their willingness to seek more or less variety in consumption is of both theoretical and practical importance. The current research proposes that a salient relationship state—romantic crush—can increase consumers' variety‐seeking tendency in unrelated consumption situations. Building on the compensatory consumption literature, we suggest that the lack of reciprocal response in the romantic crush experience may lower consumers' sense of control in the romantic relationship. Therefore, they are motivated to restore their sense of control by making more varied choices in consumption domains. Five studies provide support for this hypothesis. In line with our control‐restoration account, the effect disappears when consumers' sense of control is boosted via other means. Moreover, the effect is specific to the experience of a romantic crush and cannot be generalized to other types of romantic relationship (e.g., initial stage of love).     

Experimental Power for Indirect Effects in Group-randomized Studies with Group-level Mediators

Mediation analyses have provided a critical platform to assess the validity of theories of action across a wide range of disciplines. Despite widespread interest and development in these analyses, literature guiding the design of mediation studies has been largely unavailable. Like studies focused on the detection of a total or main effect, an important design consideration is the statistical power to detect indirect effects if they exist. Understanding the sensitivity to detect indirect effects is exceptionally important because it directly influences the scale of data collection and ultimately governs the types of evidence group-randomized studies can bring to bear on theories of action. However, unlike studies concerned with the detection of total effects, literature has not established power formulas for detecting multilevel indirect effects in group-randomized designs. In this study, we develop closed-form expressions to estimate the variance of and the power to detect indirect effects in group-randomized studies with a group-level mediator using two-level linear models (i.e., 2-2-1 mediation). The results suggest that when carefully planned, group-randomized designs may frequently be well positioned to detect mediation effects with typical sample sizes. The resulting power formulas are implemented in the R package PowerUpR and the PowerUp!-Mediator software (causalevaluation.org).     

Help yourself by helping others: The joint impact of group member organizational citizenship behaviors and group cohesiveness on group member objective task performance change

This paper examines how a group member's individual‐targeted citizenship behavior (OCBI) and organization‐targeted citizenship behavior (OCBO) interact with a salient group‐level contextual variable, group cohesiveness, to foster positive change for that group member, starting with job self‐efficacy change, and followed by objective task performance change. Over a span of 6 months, we engaged in multilevel, multisource, multistage data collection and surveyed 587 members in 83 work groups. Our results indicate that a group member's OCBI, in comparison with OCBO, is more positively related to his or her job self‐efficacy change. Group cohesiveness was found to attenuate the relationship between a group member's OCBI and job self‐efficacy change, and conversely, to accentuate the relationship between a group member's OCBO and job self‐efficacy change. Furthermore, a group member's job self‐efficacy change mediated the interactive effects of the group member's OCBI and group cohesiveness (as well as the group member's OCBO and group cohesiveness) on his or her objective task performance change.     

Influence of plastic strain localisation on the mechanical properties of metal matrix composites

The aim of the present study is to reveal the most critical underlying factor influencing the mechanical properties of metal matrix composites (MMCs). It is shown that the mechanical properties of MMCs are essentially governed by the degree of strain localisation during plastic deformation. In other words, the MMCs exhibit superior mechanical performance only if the strain localisation is obviously inhibited and the accumulated stresses can be effectively transferred out. The work provides a new perspective in guiding the design of next-generation high-performance MMCs by suppressing the strain localisation as far as possible.     

Engagement Attentional Bias toward Value-Associated Stimuli

Recent evidence has shown that learning to associate the value of behavioral outcomes with specific stimuli (i.e., value learning/association) can induce attentional capture in a subsequent visual search task. Here we investigated the component of attentional bias toward value-associated stimuli in the dot-probe paradigm. In the training phase, participants learned to associate nonsense shape outlines with monetary wins or losses. The shapes were then used as cues in an explicit no feedback dot-probe task. Probe appeared at either the salient (congruent trial) or nonsalient location (incongruent trial). Results indicate attentional bias toward value-associated stimuli, futher more this attentional bias is driven by an engagement bias.     

浅议青年文化发展与构建社会主义和谐社会

本文以分析青年群体的基本特点为起点,集中阐释了青年群体在实现自身社会化的过程中,青年文化对其社会角色的塑造以及青年文化在构建社会主义和谐社会历史进程中的独特作用。     

系统化细菌鉴定方法的探索及其启示

细菌鉴定有着悠久的历史。随着现代科学技术的快速发展,许多新方法、新技术在细菌鉴定中广泛应用,大大提高了鉴定水平。细菌鉴定技术的发展历程,引发我们探索系统化细菌鉴定的新方法,并带给我们对认识事物、看待问题、进行科学思维、继承与创新等方面的哲学思考。