Toward a definition of self-care children: A commentary on Steinberg (1986).

This comment responds to an article by Steinberg (1986) in which he stressed the desirability of investigating a wide variety of after-school experiences when examining consequences for latchkey (self-care) children. In presenting his results, he inadvertently confounded latchkey children with adolescents who spent time at a friend's house or who "hang out" with friends without adult supervision. Steinberg reported that these adolescents showed greater susceptibility to peer pressure to engage in antisocial activities. We point out that these adolescents do not fit the usual conceptualization of latchkey children and that Steinberg's study may lend support to practitioners and policy makers who assume negative latchkey consequences in the absence of research evidence. To avoid future confusion we indicate the need for a definition of latchkey children and offer a tentative definition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Strategies in Structure and Electrolyte Design for High-Performance Lithium Metal Batteries

Lithium metal is the “holy grail” anode for next-generation high-energy rechargeable batteries due to its high capacity and lowest redox potential among all reported anodes. However, the practical application of lithium metal batteries (LMBs) is hindered by safety concerns arising from uncontrollable Li dendrite growth and infinite volume change during the lithium plating and stripping process. The formation of stable solid electrolyte interphase (SEI) and the construction of robust 3D porous current collectors are effective approaches to overcoming the challenges of Li metal anode and promoting the practical application of LMBs. In this review, four strategies in structure and electrolyte design for high-performance Li metal anode, including surface coating, porous current collector, liquid electrolyte, and solid-state electrolyte are summarized. The challenges, opportunities, perspectives on future directions, and outlook for practical applications of Li metal anode, are also discussed.     

Formalised EMFTVM bytecode language for sound verification of model transformations

Model-driven engineering is an effective approach for addressing the full life cycle of software development. Model transformation is widely acknowledged as one of its central ingredients. With the increasing complexity of model transformations, it is urgent to develop verification tools that prevent incorrect transformations from generating faulty models. However, the development of sound verification tools is a non-trivial task, due to unimplementable or erroneous execution semantics encoded for the target model transformation language. In this work, we develop a formalisation for the EMFTVM bytecode language by using the Boogie intermediate verification language. It ensures the model transformation language has an implementable execution semantics by reliably prototyping the implementation of the model transformation language. It also ensures the absence of erroneous execution semantics encoded for the target model transformation language by using a translation validation approach.     

Preparing Bilingual Metadata for a Bilingual Repository

The Digital Repository of Ireland (DRI) is Ireland’s national trusted digital repository for the social and cultural, historical and contemporary data held by Irish institutions. DRI provides users with a bilingual (Irish and English) user interface at all user access levels, and provides innovative ways to process and display bilingual metadata. This article details our experience in enriching the bilingual metadata and developing the bilingual features of the repository. We present solutions to some of the linguistic and technical challenges we faced and provide recommendations to developers and archivists on how best to prepare bilingual content for contemporary archival repositories.     

Glycerokinase in human adipose tissue

The presence of glycerokinase has been demonstrated in human omental and subcutaneous adipose tissue. The enzyme reaction showed a linear time course for 5 min at 30 C and pH optima at pH 7.6 and 9.0. Saturation of the enzyme was observed at 1.8 mM adenosine triphosphate (ATP) and the double reciprocal plot of activity vs. ATP concentration was nonlinear giving two apparent Km values of 0.094 and 0.518 mM. The apparent Km for glycerol, 0.112 mM, was obtained from a linear double reciprocal plot, and the enzyme was saturated at about 0.4 mM glycerol. The activity of glycerokinase in human adipose tissue excised under general anaesthesia was low and was unrelated to adipose cell size or the degree of obesity of the subject from whom the fat was obtained.     

ESCA applied to aspects of coal surface chemistry

A recent evaluation of the surface sensitive analytical technique, Electron Spectroscopy for Chemical Applications (ESCA), in the analysis of coal, kerogen and gilsonite pitch is reviewed. The ability of ESCA to provide structural information on the materials as studied in their solid state is demonstrated. Comparison has been made of ESCA-derived atomic concentrations with corresponding data from standard elemental analyses for a series of well documented coal samples (Lower Kittanning seam, Ohio and Pennsylvania, USA). For organic oxygen atomic concentrations, ESCA-derived values are shown to be consistently higher than bulk data obtained from the Pennsylvania State University Coal Bank. A rankdependent trend has been noted for the organic oxygen data set, the coal of lowest rank showing the most deviation from a one-to-one, ESCA to bulk relationship. The ability of the ESCA experiment to monitor changes in surface chemistry has been clearly demonstrated with reference to the interaction of gilsonite pitch with u.v. light. Under the mild conditions employed, ESCA was able to detect extensive surface oxidation of both the carbon and sulphur components. Thus the combined use of ESCA and other analytical techniques holds considerable promise in studies of the structure and reactivity of coal and coal-related materials.     

Structural brain correlates of verbal and nonverbal fluency measures in Alzheimer's disease.

This study examined the relationships between regional brain volumes and semantic, phonological, and nonverbal fluency in 32 participants with Alzheimer's disease (AD). Object but not animal semantic fluency correlated with frontal and temporal gray matter volumes. Phonological fluency was not significantly associated with any brain volume examined. Nonverbal fluency was selectively associated with bilateral frontal gray matter volumes. Hippocampal volumes, although markedly reduced in these patients, were not related to any of the fluency measures. Results lend evidence to the importance of the frontal lobes in the directed generation of nonverbal and verbal exemplars by AD patients. Furthermore, both left and right-hemisphere regions contribute to the generation of verbal and nonverbal exemplars. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Cortisol reactivity and regulation associated with shame responding in early childhood.

The purpose of this study was to characterize cortisol response and regulation associated with shame responding in early childhood and to examine how general the relation between shame and cortisol is. It was predicted that children responding to task failure with shame would show a larger and more prolonged cortisol response than other children. Participants were 214 children (124 boys, 90 girls) ranging from 3.7 to 4.5 years of age (M = 4.14 years, SD = 0.24). Shame responding was assessed from children's emotion-expressive behavior in response to failing 6 performance tasks, 2 preceding (initial) and 4 following (subsequent) assessment of hypothalamic-pituitary-adrenal axis activation. Cortisol response and regulation associated with failure were assessed from saliva sampled before and 15, 20, 25, 30, and 40 min following the first of the 2 initial failures. For boys and for some girls, high initial shame was associated with greater cortisol reactivity and slower regulation of the cortisol response. For boys, high initial shame and relatively slow regulation of the associated cortisol response predicted subsequent shame responding occurring after recovery of the cortisol response. For girls, high initial shame, but not cortisol response, predicted subsequent shame responding. (PsycINFO Database Record (c) 2010 APA, all rights reserved)