Influence of annealing on the crystallographic structure and some magnetic properties of the Fe73.5Cu1Nb3-xUxSi13.5B9 nanocrystalline alloys

The influence of annealing on the structure and some magnetic properties of Fe73.5Cu1Nb3-xUxSi13.5B9 (x=1, 2, 3) alloys has been studied. The results confirmed the nanocrystalline character of these alloys in the temperature range 550–650 °C. The influence of the uranium content on the structural stability has been observed for annealing treatment at high temperature, i.e. at about 700 °C. The coercive field strongly depended both on the annealing temperature and on the uranium content. A minimum value of Hc was observed after annealing at 550 °C. Core losses of all alloys in the nanocrystalline state decreased with increasing uranium content. © 1998 Kluwer Academic Publishers     

Dural arteriovenous fistula in association with heterotopic brain nodule in the transverse sinus

We describe a 56-year-old woman with a dural arteriovenous fistula involving the transverse sinus in association with a nodule of heterotopic brain tissue in the sinus. This finding is discussed in light of a recent radiologic study of nodules in the transverse sinus.     

When coding-and-counting is not enough: using epistemic network analysis (ENA) to analyze verbal data in CSCL research

Research on computer-supported collaborative learning (CSCL) is often concerned with the question of how scaffolds or other characteristics of learning may affect learners’ social and cognitive engagement. Such engagement in socio-cognitive activities frequently materializes in discourse. In quantitative analyses of discourse, utterances are typically coded, and differences in the frequency of codes are compared between conditions. However, such traditional coding-and-counting-based strategies neglect the temporal nature of verbal data, and therefore provide limited and potentially misleading information about CSCL activities. Instead, we argue that analyses of the temporal proximity, specifically temporal co-occurrences of codes, provide a more appropriate way to characterize socio-cognitive activities of learning in CSCL settings. We investigate this claim by comparing and contrasting a traditional coding-and-counting analysis with epistemic network analysis (ENA), a discourse analysis technique that models temporal co-occurrences of codes in discourse. We apply both methods to data from a study that compared the effects of individual vs. collaborative problem solving. The results suggest that compared to a traditional coding-and-counting approach, ENA provides more insight into the socio-cognitive learning activities of students.     

Fence Safety Clearances for Electric Supply Stations

Recommended clearances for substation fences from energized live parts within an electric supply station are not addressed in the National Electrical Safety Code. This paper documents the activities of the authors to develop guidelines for establishing such fence safety clearances. Results of questionnaires designed to determine present practices and the balloting process for the initial recommendation are summarized. Also, a final suggestion for fence safety clearances is presented with example applications. The intent of this paper is to generate discussions and obtain comments on the suggested safety clearances.     

Multichannel responses to an interpersonal stressor: Interrelationships among facial display, heart rate, self-report of emotion, and threat appraisal.

60 undergraduates were exposed to a potent, provocative interpersonal stressor while facial displays of emotion were unobtrusively videotaped and heart rate was continuously monitored. Following the stressor situation, Ss completed the Differential Emotions Scale and a questionnaire designed to assess S's appraisal of threat. The video-taped facial expressions were coded by 13 naive judges to assess the intensity of the expression displayed. Minimally expressive Ss reported experiencing more guilt, displayed a significant heart rate increase, and evaluated the situation as more threatening than did the expressive Ss. Results are consistent with aspects of a discharge model of emotion that predict an inverse relationship between overt emotional displays and physiological reactivity in response to an emotional stressor. Findings argue against a facial-feedback hypothesis. (24 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)