Anodic growth of nanoporous tin oxide layers in acidic electrolytes

The aim of this work was to synthesize SnO2 nanostructures with various morphologies by simple anodic oxidation (anodization) of metallic tin in acidic electrolytes. A series of Sn foil anodizations was performed in different electrolytes (oxalic acid, citric acid, tartaric acid) with various concentrations. It was confirmed that anodic oxidation of tin in the oxalic acid results in the formation of nanoporous oxide layers with completely open pores on the surface of the electrode. On the other hand, when citric acid or tartaric acid were used as an electrolyte, porous oxide with a compact layer on the surface was formed during electrolysis

FIRST CRYOMODULE TEST AT AMTF HALL FOR THE EUROPEAN X-RAY FREE ELECTRON LASER (XFEL)

Abstract The Accelerator Module Test Facility (AMTF) at DESY in Hamburg is dedicated to the tests of RF cavities and accelerating cryomodules for the European X-ray Free Electron Laser (XFEL). The AMTF hall is equipped with two vertical cryostats, which are used for RF cavities testing and three test benches that will be used for tests of the accelerating cryomodules. Recently, the first cryomodule teststand (XATB3) was commissioned and the first XFEL cryomodule (XM-2) was tested by team of physicists, engineers and technicians from The Henry

Hierarchical models of social competence in preschool children: A multisite, multinational study

The generality of a multilevel factorial model of social competence (SC) for preschool children was tested in a 5-group, multinational sample (N = 1,540) using confirmatory factor analysis. The model fits the observed data well, and tests constraining paths for measured variables to their respective first-order factors across samples also fit well. Equivalence of measurement models was found at sample and sex within-sample levels but not for age within sample. In 2 groups, teachers’ ratings were examined as correlates of SC indicators. Composites of SC indicators were significantly associated with both positive and negative child attributes from the teachers’ ratings. The findings contribute to understanding of both methodological and substantive issues concerning SC in young children

Automated Quench Limit Test Procedure for Serial Production of XFEL RF Cavities

In the Accelerator Module Test Facility (AMTF) at DESY in Hamburg RF cavities and accelerating cryomodules are tested for the European X-ray Free Electron Laser (XFEL). Measurements are done by a team of physicists, engineers and technicians from The Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences in Kraków, Poland, as a part of Polish in-kind contribution to the XFEL. The testing procedures providing information about maximum available gradient and heat loads measurement are performed for the high gradients (up to 31MV/m). During these tests the cavity deformation caused by the Lorentz force is compensated by piezo (fast) tuners. For this purpose automated high level software was developed. This paper describes a method used to tune automatically the cavities during the RF tests. It was validated with the XFEL cryomodules. This improvement was implemented into the testing software and it is successfully used for testing of serial production cavities

Maternal attachment script representations: Longitudinal stability and associations with stylistic features of maternal narratives

To evaluate the temporal stability of maternal attachment representations obtained using a word-prompt task, a sample of mothers (N = 55) was assessed on two occasions, 12 - 15 months apart. Each mother responded to six word-prompt sets on each assessment occasion (4 word-prompt sets were designed to prime secure base themes, 2 word-prompt sets were designed to prime different themes), and the resulting stories were scored in terms of the presence and quality of the secure base scripts evident in each story. The story scriptedness scores (average across four stories) were internally consistent at each assessment (alphas >.85) and the mean difference in scores was not significant across assessments. The cross-time correlation for the composites (aggregates of scores at each age) was positive and significant, r(53) = .54. Other aspects of maternal stories were also stable (e.g., number of words used, number of sentences per story, use of words from the prompt list). Controlling for stable stylistic features of the stories did not reduce the magnitude of association for scriptedness scores across time. These results suggest that the presence and quality of secure base scripts is a stable aspect of maternal representations of attachment and that the word-prompt task is useful for prompting the script in narrative production

Longitudinal analyses of a hierarchical model of peer social competence for preschool children structural fidelity and external correlates

Achieving consensus on the definition and measurement of social competence (SC) for preschool children has proven difficult in the developmental sciences. We tested a hierarchical model in which SC is assumed to be a second-order latent variable by using longitudinal data (N = 345). We also tested the degree to which peer SC at Time 1 predicted changes in positive adjustment from Time 1 to Time 2, based on teacher and peer ratings. Using a multiple-method data-collection strategy, information for three subdomains of SC (social engagement/motivation, profiles of social interaction and personality assets assessed with Q-sorts, peer acceptance) were collected across consecutive years in preschool programs. Longitudinal confirmatory factor analyses (CFAs) demonstrated invariance of both the measurement and the structural models across age levels and yielded a cross-time path weight of .74 for the second-order factor. Analyses of latent means suggested significant increases in SC scores from the first year to second year of participation, and longitudinal cases in their second year of participation had higher scores than did age peers who entered the program as older children. Finally, Time 1 SC predicted increases from Time 1 to Time 2 for SC-relevant indicators rated by teachers and peers (standardized path coefficient of .29, p < .0011