The effect of surface geometry on soccer ball trajectories     

S. Barber  M. J. Carré 《Sports Engineering》2010,13(1):47-55

Two different measurement techniques are used to examine the effect of surface geometry on soccer ball trajectories. Five professional players are observed using high-speed video when taking curling free kicks with four different soccer balls. The input conditions are measured and the average launch velocity and spin are found to be approximately 24 m/s and 106 rad/s. It is found that the players can apply more spin (~50%) on average to one ball, which has a slightly rougher surface than the other balls. The trajectories for the same four balls fired at various velocities and spin rates across a sports hall using a bespoke firing device are captured using high-speed video cameras, and their drag and lift coefficients estimated. Balls with more panels are found to experience a higher lift coefficient. The drag coefficient results show a large amount of scatter, and it is difficult to distinguish between the balls. Using the results in a trajectory prediction programme it is found that increasing the number of panels from 14 to 32 can significantly alter the final position of a 20 m-curling free kick by up to 1 m.  相似文献   

Community,culture and identity: geography,the National Curriculum and Wales     

Richard Daugherty  Sian Jones 《Curriculum Journal》2013,24(3):443-461

ABSTRACT

The 1988 Education Reform Act legislated for a National Curriculum not for one nation but for two, Wales and England. This article reviews the way in which attempts to develop a distinctive curriculum in Wales for one subject, geography, were thwarted by the dominance among key policy‐makers in England of views about the study of place which were unsympathetic to the idea of the school curriculum being a vehicle for the development of a sense of community and national identity. Drawing on evidence from a survey of secondary school geography teachers in Wales, it considers the extent to which the teaching of geography is seen by teachers as a means of achieving such educational goals.  相似文献   

The Electronic Cataloging in Publication Cataloging Partnership Program: A Model for Cooperative Cataloging for the Twenty-First Century     

Karl E. Debus-López  Diane Barber  Caroline Saccucci  Camilla Williams 《Cataloging & classification quarterly》2013,51(1-3):25-54

The Library of Congress’ Cataloging in Publication (CIP) Program has been in existence for forty years. During this time, the CIP Program has moved from a model where the Library of Congress created all pre-publication metadata for publishers to a partnership where other libraries share in the creation of metadata. This article documents the evolution of the Electronic Cataloging in Publication (ECIP) Cataloging Partnership Program. The ECIP Cataloging Partnership Program can be used as a model to leverage limited resources across libraries to the benefit of library users nationwide.  相似文献   

School Effectiveness and School Improvement in the United Kingdom   总被引：2，自引：0，他引：2  

David Reynolds  Pam Sammons  Louise Stoll  Michael Barber  Josh Hillman 《School Effectiveness & School Improvement》2013,24(2):133-158

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University Students’ Conceptualization and Interpretation of Topographic Maps     

Douglas Clark  Stephen Reynolds  Vivian Lemanowski  Thomas Stiles  Senay Yasar  Sian Proctor 《International Journal of Science Education》2013,35(3):377-408

This study investigates the strategies and assumptions that college students entering an introductory physical geology laboratory use to interpret topographic maps, and follows the progress of the students during the laboratory to analyze changes in those strategies and assumptions. To elicit students’ strategies and assumptions, we created and refined a topographic visualization test that was administered before and after instruction to 26 students during the first semester of the study and to 92 students during the second semester. To more deeply understand how students think about and conceptualize topographic maps, we focused on eight individual students who were interviewed about their pretest and posttest answers as well as videotaped during three laboratory sessions. We found that even students who claim never to have worked with topographic maps often perform impressively on their pretests by making useful assumptions about symbolic topographic information. Some students, however, begin with less productive assumptions that may be unfamiliar to some instructors (e.g., thinking that the spacing of contour lines indicates elevation instead of slope). Initial success should not be misinterpreted, however, as an integrated understanding of topographic maps. Only in posttest interviews do most students express explanations integrating multiple normative assumptions. In addition to highlighting the strategies and assumptions that college students use to interpret topographic maps, we outline the implications of these findings for the design of learning objectives, curricular activities, and assessments for topographic lessons in introductory college geology courses and the training of future geoscientists.  相似文献   

Trust in science     

Bernard Barber 《Minerva》1987,25(1-2):123-134

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Product Review: The allied and Alternative Medicine/CATS database     

Graeme Barber 《Health information and libraries journal》1991,8(3):181-183

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Identity tensions in lesbian intercollegiate coaches     

Krane V  Barber H 《Research quarterly for exercise and sport》2005,76(1):67-81

Using social identity perspective, we investigated the experiences of 13 lesbian college coaches. Through semistructured interviews, the coaches revealed the daily identity tensions they experienced. There was constant negotiation between their social identities of "coach" and "lesbian." The social context of intercollegiate women's athletics created a complex web that juxtaposed these identities against commanding social norms. The challenges these coaches faced ranged from doing what they believed was best for the well being of their athletes (e.g., fighting homonegativism) versus what was best for their professional well being (e.g., remaining silent). These coaches did not passively accept their fate; while they struggled with identity negotiation, they also found ways to counter the heterosexist atmosphere and create positive social change.  相似文献   

Associations between Parental Psychological and Behavioral Control and Youth Internalized and Externalized Behaviors   总被引：9，自引：0，他引：9  

Brian K. Barber  Joseph E. Olsen  Shobha C. Shagle 《Child development》1994,65(4):1120-1136

In this study, psychological control of children was conceptually and empirically distinguished from behavioral control. Further, it was demonstrated as hypothesized that psychological control was more predictive of adolescent internalized problems, and that behavioral control was more predictive of externalized problems. Subjects were 473 fifth-, eighth-, and tenth-grade males and females from a Southern suburb. Control was measured by the Child Report of Parent Behavior Inventory and the Colorado Self-Report of Family Functioning Inventory. Problem behaviors were measured with the Child Behavior Checklist. First- and second-order factor analyses discriminated psychological and behavioral control, and structural equation analyses demonstrated the differential prediction of internalized and externalized problems. These last analyses were conducted using youth-reported data and validated using a subsample of 227 mother-youth pairs.  相似文献   

Conditioned inhibition of rotation-induced taste aversion     

Joseph V. Lambert  Rose Mary Barber  Phyllis Carpenito  Marilyn Cianfrani  Bernadette Mendez  Linda C. Potosnak 《Learning & behavior》1989,17(4):457-467

In three experiments, we investigated the existence of conditioned inhibition of body rotation-induced taste aversion. Rats were given conditioned inhibition training in which the taste of saccharin was always followed by rotations, but the taste of vanilla was not. Flavor-preference tests, retardation-of-acquisition tests, and summation tests of inhibition indicated that the vanilla stimulus had acquired conditioned inhibitory properties. These findings could not be interpreted as functions of either initial solution preferences or simple nonassociative effects of flavor preexposure. They lend support to a theory that views learning mechanisms as being central to the phenomenon of motion sickness, and suggest that inhibitors might be effectively employed to ameliorate its symptoms.  相似文献