Reverse evolution in nanoscale Cu-rich precipitates of an aged Fe–Cu alloy under electropulsing

Nanoscale Cu-rich precipitates (CRPs) are one of the most important microstructural nano-features responsible for embrittlement and hardening of reactor pressure vessels (RPVs), which threaten the safe operation of nuclear power plants (NPPs) and hinder the lifetime extension of nuclear reactors. A thermally aged Fe-1.1 wt.%Cu alloy, which is used to simulate embrittlement of the irradiated RPV steels, was treated by electropulsing with various parameters. The effect of electropulsing on nanoscale CRPs was investigated by using transmission electron microscopy (TEM). Compared to the traditional heat treatment, the electropulsing treatment (EPT) can accelerate the dissolution of CRPs in an aged Fe-Cu alloy on account of the higher atomic drift flux and the additional Gibbs free energy induced by electropulsing. More importantly, EPT is likely to be a new way of eliminating irradiation-induced Cu-rich precipitates.     

生活事件对初中生抑郁的影响:自尊和反刍思维的链式中介作用

为了探讨生活事件、自尊、反刍思维和初中生抑郁之间的关系,研究采用青少年生活事件量表、自尊量表、反刍思维量表和儿童抑郁量表对684名初中生进行调查。结果显示：（1）生活事件与初中生抑郁呈显著正相关;（2）自尊和反刍思维在生活事件和初中生抑郁间起链式中介作用。生活事件不仅是触发初中生抑郁的重要外部因素,而且生活事件还会通过影响自尊和经由反刍思维对初中生抑郁产生间接作用。因此,减少和避免生活事件对初中生心理的冲击,增强其自尊水平,调整其负性认知方式是改善和预防初中生抑郁的重要途径。     

汉语儿童语素意识对阅读理解的影响:默读流畅性的中介效应

通过对149名小学一年级学生两年的追踪研究,在控制了一般认知能力、语音意识以及所关注变量自回归效应的情况下,探讨默读流畅性在语素意识与阅读理解关系中的作用。结果发现：（1）儿童语素意识、默读流畅性及阅读理解随时间均有显著发展;（2）一年级下学期儿童的默读流畅性在一年级上学期语素意识影响二年级上学期阅读理解过程中的中介作用显著,而二年级上学期的默读流畅性在一年级下学期语素意识影响二年级下学期阅读理解过程中的中介作用不显著。结果表明,在小学低年级阶段,默读流畅性在早期语素意识与之后的阅读理解中发挥跨时间点的中介作用,且该中介效应随儿童认知技能的发展会发生一定的变化。     

组织中的韧性：基于心理路径和系统路径的保护性资源建构

作为跨学科的研究构念, “韧性” (resilience)呈现出心理和系统两条独立的发展轨迹。基于心理路径和系统路径, 本文系统梳理了韧性在组织不同层面的类型特质、影响因素及测量, 依托资源保护理论, 以保护性资源的建构为主线勾勒出韧性在组织不同层面的产生路径, 并据此提出相关干预策略。未来研究可尝试探究积极事件对韧性的诱发机理以及跨层面韧性之间的促进作用, 并基于心理和系统两条发展脉络开展本土化实证研究。     

揭秘经济管理中的行为异象：心理账户理论的应用启示

2017年Richard H. Thaler获得诺贝尔经济学奖, 其重要的研究贡献之一是催生并发展了心理账户理论。心理账户理论被广泛用于解释经济管理中的行为异象。文章以消费决策、金融管理决策两大领域的应用研究为外在逻辑, 以心理账户的设立、运算和关闭过程的特点为内在逻辑, 重点探讨了消费决策中的“标签效应”、“预算效应”、“价格幻觉”、“解耦效应”和“效用偏差”; 金融管理决策中的“粘蝇纸效应”、“薪酬感知之谜”、“税收-投资之谜”、“会计信息披露之谜”和“处置效应”十大行为异象。文章进一步提出未来可能的两个研究方向, 一是通过眼动技术和认知神经科学方法揭示心理账户影响行为决策的内在过程及神经机制; 二是将心理账户理论应用于“以小拨大”的行为助推, 助力政府公共管理和企业管理决策。     

奖赏环路与阿片成瘾:喙内侧被盖核的调节作用

喙内侧被盖核(RMTg)位于腹侧被盖区(VTA)的尾部, 富含抑制性的γ-氨基丁酸(GABA)能神经元.RMTg是中脑边缘多巴胺系统的一个综合调节器.它的GABA能神经元接受外侧缰核(LHb)的输入, 然后投射到VTA多巴胺能神经元, 进而抑制多巴胺的释放.这三个脑区是奖赏环路的重要组成部分, 其中RMTg在阿片类物质激活的奖赏环路中尤为重要.阿片类物质主要通过抑制RMTg GABA能神经元使VTA多巴胺能神经元去抑制, 进而激活奖赏系统.因此, RMTg有望成为治疗药物成瘾(尤其是阿片成瘾)的一个重要靶点.此外, 胆碱类物质作用于RMTg的毒蕈碱受体能够抑制阿片类物质诱导的奖赏效应.未来研究应深入探讨RMTg调控的负性奖赏环路, 这对弱化觅药动机,促进消退和戒断具有重要意义.     

条件性恐惧记忆消退的提取干预范式及其作用的神经机制

基于记忆再巩固理论的恐惧记忆提取干预范式被证明可以有效消退恐惧记忆, 能克服传统消退容易复发的缺点。该范式通过单独呈现条件刺激激活原有恐惧记忆, 使记忆重返不稳定状态, 随后在再巩固时间窗内实施干预则能改写原有记忆。目前该范式起作用的神经机制尚不明确, 本文在现有的人类研究和动物研究基础上, 总结了杏仁核、前额叶和海马三个脑区在提取干预过程中的作用, 以及该领域研究的争议点, 为之后的研究提供思路。     

睾酮与人类决策行为

睾酮是一种类固醇激素, 主要的雄性激素之一。在神经科学与神经内分泌学领域中, 早期研究发现睾酮会对人类的攻击性、社会交往、冲动性等方面产生一定的影响; 后来心理学研究者开始关注睾酮与决策之间的关系, 包括社会性决策的信任、合作、利他与竞争方面以及经济性决策的风险决策。多项研究显示, 睾酮的水平与经济性决策中的风险寻求行为呈正相关关系; 在社会性决策领域中, 高睾酮水平的个体会表现出更高的攻击性、支配性和公平性行为, 同时表现出更低的人际信任。然而这些研究结果也存在难以重复验证的现象, 需要更多的研究探寻可能影响睾酮与决策的其他因素。未来对睾酮与决策的研究可以关注睾酮与消费决策领域、探寻青少年睾酮水平与社会行为的关系以及临床应用等。     

The Experience of Intimate Relationships Among Homosexual Men in Malaysia

Malaysia is relatively conservative regarding topics like sex, and, especially, research on homosexual relationships is scarce. The current study aims to understand the experience of intimate relationships among homosexual men in Malaysia using a phenomenological qualitative approach. A total of 12 participants of various ethnic backgrounds (between 21 and 35 years of age) were recruited through purposive and snowball sampling via the Malaysian-based LGBT-friendly Facebook group. Thematic analysis was applied for data analysis, and themes emerged through looking into the perception and practice of intimate relationships. The findings of the current study reflect that the hetero-normative perception of intimate relationships is common among the participants, and is compatible with the cultural norms. However, in terms of sexual practices, the findings show similarities with more liberal parts of the world, as open relationships and casual sex is common among homosexual men. Hence, open relationships are being adopted as a strategy to improve the survivability of the relationship instead of just to satisfy sexual needs. The findings highlight the lack of a frame of reference for homosexual relationships in Malaysia. The current study adds to the scarce research on homosexuality in this country, which could assist professional helpers to better understand the different dynamics and beliefs of relationships among homosexual men and the challenges they may face.     

Perfectionism mediated the relationship between brain structure variation and negative emotion in a nonclinical sample

In maladaptive respects, perfectionism reflects an individual’s concern over making mistakes and doubting the quality of his or her own actions excessively, which would affect one’s emotion. However, little is known about the neural mechanisms associated with the perfectionism and negative affect. In this study, voxel-based morphometry was performed to identify the brain regions underlying individual differences in perfectionism, which was measured by the Chinese Frost Multidimensional Perfectionism Scale (CFMPS), in a large sample of nonclinical young adults. Our results showed that the two subdimensions of the perfectionism, concern over mistakes (CM) and doubts about actions (DA), were both positively correlated with the self-reported anxiety and depression as well as the gray matter volume (GMV) in the anterior cingulate cortex (ACC), a pivotal brain region in cognitive control, affective state, and regulation. Moreover, CM, DA, and organization scores were respectively correlated with distributed brain regions involved in multiple cognitive and emotion processes. Our results furthermore revealed that the score of DA acted a mediational mechanism underlying the relationship between the GMV of ACC and self-rating negative affect (anxiety and depression). Taken together, these results might suggest the neuroanatomical basis of perfectionism and the association among the perfectionism, negative emotion, and brain architecture. This study emphasized that perfectionism could play a crucial role in the arousal of negative affect.