Mixed-valence impurity in a nanoscale particle

We consider a mixed-valence Anderson impurity with infinite U embedded into a small metallic particle. The nanosize of the system leads to discrete energy levels rather than to a continuum of energy eigenstates for the host. Using the Brillouin-Wigner approximation we show that the magnetic susceptibility, which arises from the van Vleck admixing of the magnetic configuration into the ground state, is only weakly affected by the finite spacing of energy levels, while the specific heat and the entropy display an exponential activation at low temperatures, that is have properties deviating from a Fermi liquid.     

形状-宜人性的内隐联结及其对公平决策的影响

已有研究表明,形状感知与抽象概念之间具有隐喻联结并能够影响个体的判断与决策。当前研究在此基础上提出,不同形状与人格的宜人性存在关联且能够影响个体决策。实验1采用内隐联想范式的变式探讨不同形状与宜人性词汇之间的联系,结果未发现长方形和圆形与宜人性词汇存在内隐联结。实验2采用内隐联想测验探讨圆润面孔与棱角面孔与宜人性词汇之间的联系,结果发现圆润面孔与宜人词、棱角面孔与非宜人词之间存在内隐联结。实验3进一步考察形状与宜人性词汇的联结对公平决策的影响,结果发现圆润面孔更易知觉为宜人,个体更容易接受其作出的不公平分配,而棱角面孔更易知觉为非宜人,个体更容易拒绝其作出的不公平分配; 并且,宜人性感知在面孔形状与被试的接受率之间起中介作用。研究结果表明,圆润形状面孔与宜人词、棱角形状面孔与非宜人词存在隐喻联结,且这一联结能够进一步影响个体公平决策。     

Overvaluation of shape and weight among overweight children and adolescents with loss of control eating

Little is known about the phenomenology of pediatric loss of control (LOC) eating. Overvaluation of shape and weight, however, appears to be diagnostically meaningful among binge eating adults. We explored the significance of shape and weight overvaluation among children and adolescents with LOC eating. Participants (n = 526) included 149 overweight youth with LOC eating and 377 overweight controls (CON). Participants were categorized as those reporting at least moderate overvaluation (LOC-Mod, n = 74; CON-Mod, n = 106) or less than moderate overvaluation (LOC-Low, n = 75; CON-Low, n = 271), and compared on measures of eating-related and general psychopathology. LOC-Mod evidenced lower self-esteem than CON-Low, and greater behavioral problems than CON-Mod and CON-Low, but did not differ from LOC-Low in these domains. With the exception of LOC-Low and CON-Mod, all groups differed on global eating-disorder severity, with LOC-Mod scoring the highest. Overvaluation of shape and weight appears to be of questionable importance in defining subtypes of youth with LOC eating. However, as overvaluation and LOC eating each independently predicts eating-disorder onset, their confluence may confer even further risk for eating-disorder development. Longitudinal studies should address this possibility. Developmentally appropriate discussion about body image disturbance may be indicated in interventions targeting pediatric LOC eating and/or obesity.