Modelling the deflection of rowing oar shafts     

Brock Laschowski  Cameron C. Hopkins  John R. de Bruyn  Volker Nolte 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(1):76-86

The deflection of rowing oar shafts subjected to a static load was investigated. Two sets of sculling oars of different design stiffness were tested at three different lengths from 2.66 to 2.70 m. Loads up to 201 N were applied to the blade end of the oar shafts, and deflections were measured at six positions along the length of the shafts. The experimental results were compared with theoretical predictions obtained by modelling the oar shafts as homogenous end-loaded cantilever beams. The results show that the oar shafts are not uniform, in contradiction to the assumed model, but rather are most compliant near the sleeves and up to 80% stiffer towards the blades. The effect of oar shaft stiffness and length on the deflection angle at the blade end of the oar shaft was at most 1.18 ± 0.01°. The measured variation of stiffness along the shaft has implications for boat propulsion and rowing performance.  相似文献   

What really matters: Regional versus individual determinants of the digital divide in Germany     

Katrin Schleife 《Research Policy》2010,39(1):173-1521

This paper analyses the regional dimension of the German digital divide. It studies the determinants of home Internet use in Germany on the level of counties as well as on the level of individuals. Based on two large data sets, the analyses show that population density itself cannot explain regional differences in Internet use rates. The results rather indicate that it is the different composition of individual characteristics between rural and urban populations that accounts for the regional digital divide. At individual level, the findings underline the importance of network effects.  相似文献   

The red jacket: UTB as a model for cooperative textbook publishing   总被引：1，自引：0，他引：1  

Volker Huehn  Michael Huter 《Publishing Research Quarterly》2005,20(4):79-82

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Entrance Fees as a Subjective Barrier to Visiting Museums     

Volker Kirchberg 《Journal of Cultural Economics》1998,22(1):1-13

In a 1995 representative survey, 1,080 Germans were asked by standardized questionnaire to assess the subjective significance of 23 motives and barriers to visiting art museums, history museums and technology museums on a scale from 1 (very unimportant motive/barrier) to 5 (very important motive/barrier). An analysis of the results of the survey revealed entrance fees to be the only significant subjective barrier. In contrast to recent price elasticity studies of cultural demand, this study uses a micro-level approach – comparing individual socioeconomic and geographic characteristics with individual and subjective assessments of museum entrance fees as a barrier. The results of an ordered-probit analysis suggest income to be the only significant individual characteristic which can explain this subjective assessment. However, using correspondence analysis, several other individual characteristics such as education and professional status also appear to have a relative impact on the subjective assessment of entrance fees.  相似文献   

„Zurück zu Plessner!“     

Volker Schürmann 《Sportwissenschaft》2007,37(4):445-450

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WOMEN IN SWISS UNIVERSITIES     

Katrin Wiederkehr‐Benz 《Higher Education in Europe》1981,6(3):32-35

The following article is an abstract of the booklet “Frauen an der Hochschule” (Women in Higher Education), published by Mrs. Wiederkehr‐Benz in August 1980, Zurich.>

The article, sent to us by Mrs. Wiederkehr‐Benz, is meant to provide the reader with some complementary information concerning the situation of women in higher education in Switzerland, The article stresses the consequences of early socialization, and later role‐conflicts in performance oriented system of higher education. Similar lines of thought have also been expressed in the articles on the Netherlands and FRG.

Mrs. Wiederkehr‐Benz is a psychologist attached to the"Psyahologische Studentenberatungsstelle” (Centre for Student Counselling), of Zürich's institutions of higher education.  相似文献   

The effects of feedback on achievement,interest and self-evaluation: the role of feedback’s perceived usefulness     

Birgit Harks  Katrin Rakoczy  John Hattie  Michael Besser  Eckhard Klieme 《教育心理学》2014,34(3):269-290

The impact of two types of written feedback (process-oriented, grade-oriented) on changes in mathematics achievement, interest and self-evaluation was compared – with a particular focus on the mediating role of feedback’s perceived usefulness. Participants, 146 ninth graders (aged 14 to 17?years), were assigned to either a process-oriented or a grade-oriented experimental feedback condition. They worked on mathematics tests, received feedback on their test results and completed surveys measuring feedback’s perceived usefulness, interest and self-evaluation. Results of path analysis showed that process-oriented feedback was perceived as more useful than grade-oriented feedback and that feedback’s perceived usefulness had a positive effect on changes in achievement and interest. Consistent with this, process-oriented feedback had a greater positive indirect effect than grade-oriented feedback on changes in mathematics achievement and interest via its perceived usefulness. There were no such effects on changes in self-evaluation. Potential explanations for these findings, educational implications and possible directions for future research are discussed.  相似文献   

An observational model for biomechanical assessment of sprint kayaking technique     

Lisa K. McDonnell  Patria A. Hume  Volker Nolte 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(4):507-523

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Media and Occupational Aspirations: The Effect of Television on Career Aspirations of Adolescents     

Volker Gehrau  Tim Brüggemann  Jutta Handrup 《广播与电子媒介杂志》2016,60(3):465-483

Vocational decisions are important decisions for adolescents. This article takes television effects into account. A literature review for the occupational world in TV programs reveals a strong focus on some occupations as well as small cultivation effects plus learning effects from mediated role models. A secondary analysis of 2 panel waves was undertaken to study the effect of media role models on occupational aspiration. Television usage in a program segment correlated with corresponding aspirations. A process models showed a strong effect of career aspiration in 1 panel wave on related television usage and career aspirations in the following panel wave.  相似文献   

Experiencing Exhibitions: A Review of Studies on Visitor Experiences in Museums     

Volker Kirchberg  Martin Trndle 《Curator: The Museum Journal》2012,55(4):435-452

Abstract This article reviews empirically oriented studies from the United States and Europe concerning visitor experiences in museum exhibitions in order to pinpoint similarities and differences among them. In the last 20 years, only a few scholars have tackled this research question in multifaceted empirical ways, although some of them have done so extensively. By comparing theoretical and methodical issues, as well as important results, we are able to outline several analytical building blocks that compose a complex framework of visitor expectations, experiences, and outcomes. Gathering credible data on experiences of visitors in exhibitions or museums, a method dating back to the tracking records of Robinson (1928) , is an ongoing challenge for the empirically inclined science of museum studies. Social scientists at universities and museums have been asking for 20 years: What are the findings regarding factors, structures, and consequences of exhibition experiences? Where are the blind spots? Which questions should be researched?  相似文献