Influence of aging pathways on the evolution of heterogeneous solute-rich features in peak-aged Al-Mg-Si-Cu alloy with a high Mg/Si ratio

We report on a study of the influence of aging pathways on the evolution of solute-rich features in peak-aged Al-Mg-Si-Cu alloys. The concentration and partitioning ratios of Mg, Si and Cu and Mg/Si ratios in the heterogeneous solute-rich features all increase with increasing size, with Si exhibiting the highest partitioning ratio, but notably these ratios change dramatically depending on the aging pathway selected. Accordingly, the short-time age hardening response can be enhanced by promoting both homogeneous and heterogeneous precipitate nucleation, while simultaneous improvements in peak-aged strength and elongation can be attained by a vacancy-assisted aging pathway.     

Effect of heat treatment on the microstructure and mechanical properties of spray-formed 7055 aluminium alloy

7055 Al alloys samples were prepared by spray forming and hot-extrusion followed by two different aging treatment procedures. Their different distributions of GP zones, and nanoscale precipitates η′ (MgZn) and η (MgZn₂) are extensively investigated by transmission electron microscope (TEM). The mechanical properties, including tensile strength, Vickers hardness and elongation of both aged 7055 Al alloys, have also been measured and analysed. It is found that T6 and T76 aging treatment results in quite different microstructure and mechanical properties. The outstanding performance of the 7055 Al alloys after T6 aging treatment is attributed to nanoscale semi-coherent dispersion precipitates.     

Neuroticism and Marital Satisfaction During the Early Years of Chinese Marriage: The Mediating Roles of Marital Attribution and Aggression

On the basis of three annual waves of data obtained from 268 Chinese couples, we tested an actor–partner interdependence mediation model in which spouses’ neuroticism was linked to their own and partners’ marital satisfaction through both intrapersonal processes (i.e., marital attribution) and interpersonal processes (i.e., marital aggression). Considering intra‐ and interpersonal processes simultaneously, four indirect, mediating pathways were identified: Time 1 Wives’ Neuroticism → Time 2 Wives’ Attribution or Aggression, while controlling for Time 1 Wives’ Attribution or Aggression → Time 3 Wives’ or Husbands’ Marital Satisfaction, while controlling for Time 1 Wives’ or Husbands’ Marital Satisfaction. This study not only adds to a limited body of research examining why neuroticism is associated with conjugal well‐being, but also extends prior research by focusing on Chinese couples and utilizing a longitudinal, dyadic mediation model. Such findings have important practical implications. Couples involving neurotic partners may benefit from interventions based on cognitive‐behavioral approaches. When working with couples challenged by neuroticism, practitioners need to help them address dysfunctional interactive patterns as well as distorted cognitive styles.     

刻板印象提升与刻板印象促进

刻板印象提升指个体意识到外群体具有消极刻板印象, 而产生与受诋毁的外群体向下的社会比较, 以提高个体自我效能感和动机, 进而提高表现; 刻板印象促进是积极刻板印象被激活后的积极结果, 指当个体处在他们的积极刻板印象身份被激活的情境中, 表现上升的一种现象。在刻板印象提升与刻板印象促进概念论述的基础上, 重点探讨了调节变量和结果影响这两种联系, 并从相关概念、被试要求和心理机制这三方面论述了这两者的区别。最后, 指出未来研究应加强对二者的关注, 消除其在概念上的混淆, 开展相关心理与神经机制的研究, 以及结合刻板印象阻抗进行探讨。     

Temporal modulations of agonist and antagonist muscle activities accompanying improved performance of ballistic movements

Although many studies have examined performance improvements of ballistic movement through practice, it is still unclear how performance advances while maintaining maximum velocity, and how the accompanying triphasic electromyographic (EMG) activity is modified. The present study focused on the changes in triphasic EMG activity, i.e., the first agonist burst (AG1), the second agonist burst (AG2), and the antagonist burst (ANT), that accompanied decreases in movement time and error. Twelve healthy volunteers performed 100 ballistic wrist flexion movements in ten 10-trial sessions under the instruction to "maintain maximum velocity throughout the experiment and to stop the limb at the target as fast and accurately as possible". Kinematic parameters (position and velocity) and triphasic EMG activities from the agonist (flexor carpi radialis) and antagonist (extensor carpi radialis) muscles were recorded. Comparison of the results obtained from the first and the last 10 trials, revealed that movement time, movement error, and variability of amplitudes reduced with practice, and that maximum velocity and time to maximum velocity remained constant. EMG activities showed that AG1 and AG2 durations were reduced, whereas ANT duration did not change. Additionally, ANT and AG2 latencies were reduced. Integrated EMG of AG1 was significantly reduced as well. Analysis of the alpha angle (an index of the rate of recruitment of the motoneurons) showed that there was no change in either AG1 or AG2. Correlation analysis of alpha angles between these two bursts further revealed that the close relationship of AG1 and AG2 was kept constant through practice. These findings led to the conclusion that performance improvement in ballistic movement is mainly due to the temporal modulations of agonist and antagonist muscle activities when maximum velocity is kept constant. Presumably, a specific strategy is consistently applied during practice.     

儿童同伴接纳知觉准确性及偏差与孤独感的关系:一项交叉滞后研究

以515名小学3年级到6年级的儿童为研究对象,采用交叉滞后研究设计,探讨同伴接纳知觉准确性和偏差与孤独感之间的关系。研究中,由儿童评定自己对同班每个同学的喜欢程度,预计同班同学对自己的喜欢程度,并完成社交自我知觉和孤独感量表。结果表明:(1)同伴接纳知觉绝对准确性与孤独感相关不显著,但同伴接纳知觉相对准确性可以显著预测当前和一年后的孤独感。(2)同伴接纳知觉偏差与孤独感具有双向影响作用,积极同伴接纳知觉偏差有利于降低儿童的孤独感,并且孤独感能正向预测后期的同伴接纳知觉偏差。     

决策中后悔的ERP研究

采用运气轮博弈范式探讨后悔的加工时程。分析决策正误的ERPs发现,200～300ms决策错误比正确诱发更为负走向的波,表现为典型的FRN（feedback-related negativity, FRN）;300～400ms决策正确比错误诱发更大的P300。500～900ms决策正确比错误诱发更大的LPC（late positive component, LPC）,并表现出明显的右半球优势效应。上述结果支持了FRN加工反馈刺激显著性信息和P300加工反馈刺激效价的观点,研究发现后悔与LPC可能具有密切关联。将来研究须在控制得失程度基础上,考察FRN、P300和LPC与效价、得失及得失程度和情绪体验的关系。     

自我、文化与记忆：自传体记忆的跨文化研究

自传体记忆不仅是对过去自我经验的加工和提取,还反映了特定的社会和文化背景。近年来,自传体记忆跨文化研究表明,东西方被试在最早记忆年龄、记忆容量和具体性、内部语言的使用、记忆取向等方面存在差异。文章从自我概念、亲子回忆和叙事方式、社会变迁和文化多元化等角度,探讨了文化自我观对于自传体记忆的核心意义。Nelson和Fivush的社会文化发展观则从发展的角度动态考察了内外因素对自传体记忆产生文化和个体差异的机制。文章还回顾了自传体记忆跨文化研究的主要方法。最后,文章探讨了自传体记忆跨文化及相关领域的研究前景和存在的问题     

社会网络视角下的同伴关系与心理健康

近年来, 从社会网络视角考察同伴关系与心理健康的相互作用正成为发展心理学和健康心理学研究的热点。研究者多借助整体网和纵向数据, 通过两种作用机制, 即选择过程(selection process) (强调心理和行为变量对社会网络和同伴关系的影响, 如关系的形成、维持和解除)和影响过程(influence process) (强调社会网络和同伴关系对心理和行为变量的影响), 来分析同伴关系与心理健康协同演进的动态过程。实证研究关注的领域集中在青少年健康风险行为(如吸烟、喝酒、药物滥用)和情绪问题(如抑郁、焦虑、孤独感)。未来研究应该注重拓展社会网络的类型和样本、加强理论建构、增加对积极心理和消极关系的研究, 并有望在互联网领域及社会网络的生物学基础等方面取得进展。     

情绪的确定性评价对信息加工的影响

检验了情绪的效价和确定性评价对个体的信息加工策略选择的影响及其心理机制。结果表明,情绪效价对个体的信息加工方式的影响会受到情绪确定性评价的调节。高确定评价的情绪中,积极情绪的被试更倾向于采用启发式加工,消极情绪的被试更倾向于采用系统式加工。积极情绪中,高确定评价情绪的被试更倾向于采用启发式加工,低确定评价情绪的被试更倾向于采用系统式加工。当个体对自己产生情绪的原因进行合理归因后,情绪效价和确定性评价对个体信息加工方式的影响效应都消失了,说明情绪的效价和确定性评价均以信息的方式对对个体信息加工策略的选择产生影响。