Vacancy-mediated structural changes in Au–Cu nanoparticles

We report the formation of new phases in bimetallic Au–Cu nanoparticles. These phases were observed in nanoparticle synthesised by adopting a three-step protocol in a single pot. Nanoparticles at 180°C for 1?h led to the formation of single-phase solid solution of Cu in Au. Subsequent heat treatment at 290°C for 2?h of these Au–Cu nanoparticles revealed three new phases. One of them relates to the modification of occupancy of Cu in an ordered AuCu tetragonal phase (tP4). This cell although retains tetragonal symmetry but displays metrical properties akin to that of a cube. The other two relates to vacancy ordering along <111> directions in the {111} planes of an ordered AuCu3 cubic phase (cP4). On the one hand, statistical occupancy of vacancy on Cu site in this cell leads to the reduction of cell size from ～3.75?Å to ～3.5?Å whereas ordering of vacant layer on the other hand gives rise to symmetry breaking. Former continues to display cubic symmetry whereas latter transforms to a trigonal cell.     

Freud and narcissism: Developing links for inclusion of the ‘object’

Abstract

The problematic of narcissism in the way Freud visualized forces us to acknowledge the dualism of drives inside the subject; the object relations theory then builds up on the inherent need and the structuring potential of the object. The paper traces the growth of this concept in Freud's thinking in a bid to show how the object's otherness is not fully metabolized within the Freudian corpus. On the other hand, recent criticisms of object relations theory point to the perfunctory role ascribed to Freud's most radical discovery of the dualism of drives. Winnicott, Laplanche and Green have all developed theories that have provided pertinent rejoinders to the problematic of narcissism and object relations. The paper discusses how deconstructing and “going back over Freud” helps us to redefine object relations and give the drive functioning due importance. Hence the main thesis of the paper – that of narcissism – reveals the decentered subject's tussle with itself and with the alienness emanating from the object's otherness. If used creatively, ideas such as “otherness”, “objectalizing function” and Green's conceptualization of the clinical significance of negative and positive narcissism then seek to enrich the theorization on narcissism.     

Individual Growth Curve Modeling of Specific Risk Factors and Memory in Youth with Type 1 Diabetes: An Accelerated Longitudinal Design

Objective: To examine if diabetes risk factors disrupt memory score trajectories in youth with T1D over three years with a powerful accelerated longitudinal method and individual growth curve modeling. Methods: Participants aged 9–17 completed memory measures at study enrollment and two years later. Results: Poorer metabolic control over the course of the study related to a significant decrease in visual memory scores. Compared to baseline, these youth scored 1.99 points lower at follow-up. Generally appropriate developmental gains were made in memory trajectories and girls' visual and verbal memory improved more than boys. No significant effects of disease duration, age of onset, or severe hypoglycemia were found on visual or verbal memory over three years time. Conclusions: Of the risk factors studied, only poorer metabolic control had a significant impact upon visual memory after three years. Verbal memory was unaffected. However, given that level of metabolic control tends to remain relatively consistent over time, the effect of continued poorer metabolic control on memory should be monitored.     

Influence of precipitation of intermetallics on Young's modulus in nickel and zirconium base alloys

The influence of precipitation of intermetallic phases on changes in Young's modulus in nickel and zirconium base alloys is discussed. This study shows clearly for the first time that the change in the modulus due to precipitation of intermetallic phases in these alloys is essentially governed by the change in the modulus of the matrix due to removal of precipitation forming elements, and not by the modulus of the precipitated intermetallics or the matrix/intermetallic interface.     

Pressure-induced structural transition in UGa2

High-pressure X-ray diffraction has been performed on UGa₂ up to 20?GPa using a diamond anvil cell. UGa₂ exhibits the AlB₂-type structure with space group P6/mmm at room temperature and atmospheric pressure. At about 16?GPa a reversible structural transformation to a tetragonal phase was observed. The bulk modulus of the AlB₂-type phase has been determined to be ～100?GPa, which is comparable to rare earth digallides like TmGa₂ and HoGa₂.     

Emotion perception is mediated by spatial frequency content

Spatial frequencies have been shown to play an important role in face identification, but very few studies have investigated the role of spatial frequency content in identifying different emotions. In the present study we investigated the role of spatial frequency in identifying happy and sad facial expressions. Two experiments were conducted to investigate (a) the role of specific spatial frequency content in emotion identification, and (b) hemispherical asymmetry in emotion identification. Given the links between global processing, happy emotions, and low frequencies, we hypothesized that low spatial frequencies would be important for identifying the happy expression. Correspondingly, we also hypothesized that high spatial frequencies would be important in identifying the sad expression given the links between local processing, sad emotions, and high spatial frequencies. As expected we found that the identification of happy expression was dependent on low spatial frequencies and the identification of sad expression was dependent on high spatial frequencies. There was a hemispheric asymmetry with the identification of sad expression, especially in the right hemisphere, possibly mediated by high spatial frequency content. Results indicate the importance of spatial frequency content in the identification of happy and sad emotional expressions and point to the mechanisms involved in emotion identification.     

Responses of low-IQ students on the learning awareness questionnaire compared to students matched on mental and chronological age

Learning awareness, including semantic content, response strategy, processing strategy, summarization, and memory in the classroom, were examined in students with mental retardation. From urban schools in Japan special high school students with average IQ of 60 (n = 40) and students with normal intellectual capacity matched on mental (n = 40) and chronological age (n = 40) were administered a 16-item Learning Awareness Questionnaire. Students of low IQ on the Tanaka-Binet test obtained lower scores on semantic content and memory strategies than chronological or mental age-matched controls, but not on response and processing. Scores indicated that students of low IQ may be equally aware of learning processes related to response and processing strategies.     

Spirituality in Disability and Illness

Spirituality appears with increasing frequency in the research literature, and a paradigm involving mind-body-spirit interaction is emerging. The relationship of spirituality to disability and illness is at the center of a growing body of knowledge. A comprehensive literature review supported spirituality as coping method among individuals experiencing a variety of illnesses including hypertension, pulmonary disease, diabetes, chronic renal failure, surgery, rheumatoid arthritis, multiple sclerosis, HIV/AIDS, polio and addictive illnesses. Additionally, spirituality is a resource when dealing with critical illness as well as terminal illness and end of life issues, and it is utilized by both patients, and family members. Discussion of research findings, implications for health care practice and future research is also presented.