Photoelastic analysis of stress concentration for beams in pure bending with a central hole     

James J. Ryan  Leander J. Fischer 《Journal of The Franklin Institute》1938,225(5):513-526

This paper presents a photoelastic study of the conditions of stress concentration about a hole in a beam subjected to pure bending. Rules for stress determination in beams of this type are suggested.  相似文献   

What static and dynamic properties should slalom skis possess? Judgements by advanced and expert skiers     

Fischer C  Overney LS  Fauve M  Blanke O  Rhyner H  Herzog MH  Bourban PE  Månson JA 《Journal of sports sciences》2007,25(14):1567-1576

Flexural and torsional rigidity are important properties of skis. However, the flexural and torsional rigidity that lead to optimal performance remain to be established. In the present study, four pairs of slalom skis that differed in flexural and torsional rigidity were tested by advanced and expert skiers. Using a 10-item questionnaire, different aspects of the skis' performance were rated on a 9-point scale. For each pair of skis, physical measurements were compared with the ratings of the two groups of skiers. Correlations (Spearman) were then determined between (i) different mechanical properties of the skis (static and dynamic), (ii) subjective assessments of the participants, and (iii) properties of the skis and the participants' assessments. The latter showed that expert skiers rate the aspects of the skis more accurately than advanced skiers. Most importantly, expert skiers are particularly sensitive to torsion of the skis. These results suggest that such highly rated elements should be addressed in future ski designs.  相似文献   

Sport in China. Entwicklungsskizze und Bestandsaufnahme     

Rolf von der Laage  H. Fischer 《Sportwissenschaft》1977,7(3):304-306

  相似文献   

Safe spaces: human rights education in diverse contexts     

Gabriela Martínez Sainz 《Teacher Development》2014,18(3):446-448

  相似文献   

Horizontal ground reaction forces to stationary running performed in the water and on dry land at different physiological intensities     

Cristine Lima Alberton  Stephanie Santana Pinto  Gabriela Neves Nunes  Douglas Guerreiro dos Santos Rau  Paula Finatto  Amanda Haberland Antunes 《European Journal of Sport Science》2017,17(8):1013-1020

The aim of the present study was to compare the peak anterior–posterior (Fy) and medio–lateral (Fx) ground reaction forces (GRFs) of women performing stationary running at different intensities in aquatic and dry land environments. Fourteen young women performed the stationary running exercise at three cadences (first ventilatory threshold, second ventilatory threshold and maximum effort, as determined during exercise in water) in aquatic and dry land environments. Two-way repeated measures ANOVA was used to analyse the data (α?=?.05). As a result, significantly lower peak Fy anterior, Fy posterior, Fx medial and Fx lateral values were observed for the aquatic environment, except for the Fy posterior at the first ventilatory threshold. Significant differences were observed between cadences in the peak Fy anterior, Fy posterior, Fx medial and Fx lateral values, with higher values for the cadence corresponding to maximum effort compared to the first ventilatory threshold, except for the Fy posterior and Fx medial in the aquatic environment. The results indicate that the horizontal GRFs are reduced in the aquatic environment and depend on the intensity of stationary running exercise performance.  相似文献   

Re: Trends in child maltreatment literature (Behl, Conyngham, & May, 2003)     

Howard Fischer 《Child abuse & neglect》2003,27(12)

  相似文献   

Book reviews     

M. Borovcnik  R. Fischer  G. Glaeser 《Educational Studies in Mathematics》1983,14(1):101-105

  相似文献   

Psychomotorik in Therapie und Pädagogik     

K. Fischer 《Sportwissenschaft》1990,20(3):346-350

  相似文献   

Studying activities that take place in speech interactions: a theoretical and methodological framework     

Valérie Saint-Dizier de Almeida  Jean-Marc Colletta  Emmanuelle Auriac-Slusarczyk  Antonietta Specogna  Jean-Pascal Simon  Gabriela Fiema 《International journal of qualitative studies in education》2016,29(5):686-713

The paper proposes a theoretical and methodological framework based on a pluralistic, concerted approach to the study of activities that take place in and through speech interactions. The framework has a general scope, applying to any collective activity taking form through language interactions. It contributes to a fuller understanding of the dynamics of activity and the emergence of the phenomena observed. The framework fits a constructivist and interactionist paradigm. It allows an approach to different dimensions of the activity: communicational, functional, discursive and interlocutory. The theories, models, concepts and methods chosen to address each of the dimensions are presented. From the study of a collaborative philosophical inquiry produced in the first year of a French primary school, we illustrate the use of the framework and show how it can be enriched according to the nature of the activity studied and researchers’ aims.  相似文献   

Follow-up of a preschool epidemiological sample: cross-age continuities and predictions of later adjustment with internalizing and externalizing dimensions of behavior   总被引：5，自引：0，他引：5  

M Fischer  J E Rolf  J E Hasazi  L Cummings 《Child development》1984,55(1):137-150

The continuity of behavioral adjustment from preschool through elementary school and junior high school years was examined. 541 children aged 9-15 years from a preschool epidemiological study were relocated and behavior checklist data obtained. Analyses focused on the relationship between internalizing and externalizing behavior dimensions from the preschool to follow-up periods. It was found that preschool externalizing symptoms were positively correlated with later externalizing and internalizing symptoms in the entire sample. Preschool internalizing symptoms, however, were predictive of later internalizing symptoms only for 2-year-old girls and 5- and 6-year-old boys. Similar results were obtained for clinically disturbed preschoolers. Results are consistent with previous findings regarding the longitudinal continuity of externalizing behavior but are at odds with reports of equal or greater stability of internalizing behavior. Given the magnitude of obtained correlations, even when significant, the results support the view that discontinuity rather than continuity in behavioral adjustment from preschool to later ages is the rule. The importance of examining other mediating variables in the prediction of behavioral adjustment and the need for models of development that encompass both stability and change are discussed.  相似文献