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41.
Rafael Escamilla Glen Fleisig Steven Barrentine James Andrews Claude Moorman III 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(2):213-228
The purpose of this study was to quantify and compare kinematic, temporal, and kinetic characteristics of American and Korean professional pitchers in order to investigate differences in pitching mechanics, performance, and injury risks among two different cultures and populations of baseball pitchers. Eleven American and eight Korean healthy professional baseball pitchers threw multiple fastball pitches off an indoor throwing mound positioned at regulation distance from home plate. A Motion Analysis three‐dimensional automatic digitizing system was used to collect 200 Hz video data from four electronically synchronized cameras. Twenty kinematic, six temporal, and 11 kinetic variables were analyzed at lead foot contact, during the arm cocking and arm acceleration phases, at ball release, and during the arm deceleration phase. A radar gun was used to quantify ball velocity. At lead foot contact, the American pitchers had significantly greater horizontal abduction of the throwing shoulder, while Korean pitchers exhibited significantly greater abduction and external rotation of the throwing shoulder. During arm cocking, the American pitchers displayed significantly greater maximum shoulder external rotation and maximum pelvis angular velocity. At the instant of ball release, the American pitchers had significantly greater forward trunk tilt and ball velocity and significantly less knee flexion, which help explain why the American pitchers had 10% greater ball velocity compared to the Korean pitchers. The American pitchers had significantly greater maximum shoulder internal rotation torque and maximum elbow varus torque during arm cocking, significantly greater elbow flexion torque during arm acceleration, and significantly greater shoulder and elbow proximal forces during arm deceleration. While greater shoulder and elbow forces and torques generated in the American pitchers helped generate greater ball velocity for the American group, these greater kinetics may predispose this group to a higher risk of shoulder and elbow injuries. 相似文献
42.
Agriculture, industry and medicine are being altered by new biotechnologies. Biotechnology education is important because todays students and citizens will make decisions about the development and application of these new molecular biologies. This article reports an investigation of the teaching of biotechnology in an Australian state, New South Wales (NSW). In NSW few students were electing to answer examination questions related to biotechnology, suggesting that few students were studying the topic. This study looks at why electives relating to biotechnology are chosen or not chosen by students and teachers, with the intention of developing a greater understanding of the requirements for provision of a successful unit of study in this subject. Data was obtained through a survey of secondary science teachers, interviews with teachers and two case studies of the teaching of a biotechnology unit. Teachers reported a range of obstacles to the teaching of biotechnology including the difficulty of the subject matter and a lack of practical work that was suited to the content of the teaching unit. If biotechnology is worth learning in school science, then further research is needed to identify ways to promote the effective teaching of this topic, which teachers regard as important for, and interesting to, students but which most teachers choose not to teach. 相似文献
43.
Satomi Izumi Taylor Vivian Gunn Morris Cosby Steele Rogers 《Early Childhood Education Journal》1997,24(4):235-238
Toys can be used to promote children's cognitive, physical, motor, language, social, and emotional development. Safety and
developmental appropriateness are of the utmost importance when selecting children's toys. Parents and teachers and other
helping professionals need to teach children the safe use of toys to prevent toy-related accidents.
Obtain additional information regarding toy safety by calling the U.S. Consumer Product Safety Commission at 1(800)638-CPSC. 相似文献
44.
Whilst graphical user interfaces (GUI) have gained much popularity in recent years, the need of the visually impaired to use applications in a non-visual environment is great. This paper promotes the provision of interfaces that allow users to access most of the functionality of existing GUIs using speech. This has been achieved by the design of a speech control tool that incorporates speech recognition and synthesis into existing packaged software, such as Teletext, the Internet or a word processor. The tool developed has taken the menu structure as a means of demonstrating what is accessible by the use of speech input and output. The tool provides the facility to dump screen text into clipboard and read it out loud. Adapting existing GUI applications in this way requires successful integration of speech, which in turn requires a profound understanding of the medium and the development of human engineering techniques. 相似文献
45.
Michael D. Steele Kimberly Cervello Rogers 《Journal of Mathematics Teacher Education》2012,15(2):159-180
Teachers of mathematics orchestrate opportunities for interactions between learners and subject matter. Therefore, mathematics
teachers need rich, multidimensional content knowledge for teaching mathematics, which incorporates knowledge of the subject
matter, students, and teaching. Studying this mathematical knowledge for teaching (MKT) necessitates more than a unidirectional
assessment. In this study, the mathematical knowledge for teaching reasoning and proving of two secondary mathematics teachers
was investigated through classroom observations and clinical assessments. Results indicate that using MKT as a frame for examining
classroom practice, in addition to assessing the MKT a teacher possesses in a clinical setting, provides an in-depth and innovative
method for investigating MKT. The comparison of the two cases also identifies student positioning as a key mediating factor
between MKT and opportunities to learn. Implications for using MKT as a lens for examining practice in teacher education are
discussed. 相似文献
46.
This article examines whether academic libraries are still reclassifying materials, how they are doing so, and if the acquisition of electronic materials has an impact on reclassification efforts. An online survey was sent to the heads of cataloging units at libraries belonging to the Association of Research Libraries to answer these questions. Almost one-third of libraries are currently involved in reclassification projects. Most respondents reported they do not believe that purchasing e-books has affected their decisions about reclassification. The article also examines the faceted search capability of next-generation catalogs and their possible impact on patrons’ use of classification. 相似文献
47.
The purpose of this study was to examine the factor structure of the Family Child Care Environment Rating Scale—Revised (FCCERS-R) in high-stakes contexts. The results of an exploratory factor analysis revealed three dimensions of quality on the FCCERS-R: (1) Activities/Materials, (2) Language/Interaction, and (3) Organization. This study also explored whether abridged versions of the FCCERS-R could serve as a proxy for the full instrument. In addition to subsets of FCCERS-R items created from the factor structure, purposively and randomly chosen item subsets were created. The purposively chosen subsets included 6-, 9-, and 12-item scales comprised of the items with the highest factor loading across the three factors, whereas the randomly chosen subsets consisted of 12 items. Results of a discriminant analysis showed that the factor subsets were poorer proxies for the total FCCERS-R score than were the other subsets, which demonstrated comparable internal consistencies and discriminant power as the full FCCERS-R when classifying homes into general quality categories. Implications for adopting shorter versions of the FCCERS-R are discussed. 相似文献
48.
49.
Claude Diebolt 《Zeitschrift für Erziehungswissenschaft》2000,3(4):517-538
Zusammenfassung Nach einer langen Phase, in der die Theorie der Langen Wellen keine Beachtung fand, wurde sie in den 1970-er Jahren von Wirtschaftshistorikern
wieder belebt, um sie neuen, dynamischen Anwendungen in der makro?konomischen Analyse zuzuführen. Im gleichen Zeitraum erh?hte
sich in den gro?en Volkswirtschaften die Variabilit?t der Wachstumsraten der Realeinkommen. Hierdurch wurde das Ende der Phase
fast ununterbrochenen Wachstums markiert, die die meisten industrialisierten Volkswirtschaften nach dem Zweiten Weltkrieg
durchlaufen hatten. Das erneuerte Interesse an der Theorie der Langen Wellen, das mit der Krise der Keynesianischen Wirtschaftstheorie
einher ging, wurde zunehmend als grundlegender Neuansatz innerhalb der makro?konomischen Theorie angesehen. Dieser Artikel
stellt einen Beitrag zu diesem Prozess dar; es wird postuliert, dass zwischen den Ausgaben für Humankapital (Bildung und Ausbildung,
L?hne, Gesundheitsvorsorge etc.) und den Ausgaben, die für das materielle Wachstum get?tigt werden, ein Zusammenhang besteht.
Summary A Method of Recording Educational Investment in the 19th and 20th Century — Germany, France, Great Britain and Spain compared After a long period of hibernation, long wave theory was brought out and dusted off again by economic historians in the 1970s for new, vigorous applications in macroeconomic analysis. During the same period, the major market economies experienced greater variability in real income growth rates, thus marking the end of a period of an almost uninterrupted growth enjoyed by most industrialized economies since World War II. This renewed interest in long wave theory, which coincided with the crisis in Keynesian economics, became increasingly identified with a profound rethinking of macroeconomic theory. This paper is a contribution to the process, and postulates a link between expenditure on human development (education, wages, health care, etc.) and that devoted to material growth.相似文献
50.
Camille Sabourin Christiane Trottier Eric Frenette Martin Camiré Vicky Drapeau Claude Goulet 《Measurement in physical education and exercise science》2020,24(1):33-48
ABSTRACTResearch on positive youth development and life skills in sport has gained considerable attention over the past decades. However, there is a lack of translated questionnaires examining youth development and life skills available to non-English researchers and practitioners. The purpose of this research project was to adapt in French two questionnaires and to accumulate validity evidence of these adaptations. The short form – Youth Experiences Survey for Sport and the Life Skills Scale for Sport were adapted using a procedure based on a transcultural validation methodology applied to psychological measures. This research comprises four studies, which led to the French adaptation and validation process of each questionnaire. In conclusion, the results obtained show that these adapted French questionnaires can now be used to evaluate the perceptions and lived experiences of French-speaking athletes regarding positive youth development and life skills in sport. 相似文献