The HPT value proposition in the larger improvement arena     

Guy W. Wallace 《Performance Improvement》2003,42(2):48-49

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Readers' forum     

Guy W. Wallace 《Performance Improvement》2002,41(5):5-5

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Books and Good Stuff: A Strategy for Building School to Home Literacy Connections     

Pauline Davey Zeece  Betty Morgan Wallace 《Early Childhood Education Journal》2009,37(1):35-42

Engaging young children in literacy activities at home is one way for families to augment and enrich the home literacy setting and to participate in their child’s education at an early age (St. Pierre et al. in Dev Psychol 41(6): 953–970, 2005). Burgess et al. (Read Res Quart 4(4): 408–426, 2002) suggested that the resources families have at their disposal, the quality of literacy role models provided by parents, and the types of literacy and language activities in which parents and children engage, are all related to young children’s developing literacy and language abilities. Other studies demonstrated that even modest literacy-promoting interventions can significantly enhance a young child’s early literacy environment by increasing the frequency of parent–child book-sharing activities (Weitzman et al. in Pediatrics 113(5):1248–1253, 2004). Dever (J Early Educ Fam Rev 8(4):17–28, 2001) and Dever and Burtis (Early Child Dev Care 172(4):359–370, 2002) emphasize the use of family literacy bags for early childhood development. Developing and sharing take-home literacy bags is an exciting literacy-promoting activity that may be shared with children and families to provide support for emergent literacy. This article explores the development of the BAGS (Books and Good Stuff) take-home literacy kits and provides suggestions for content, construction, implementation, and evaluation. Sixteen current books are reviewed and recommended by theme.  相似文献   

How do approaches to solving open-ended problems vary within the science disciplines?     

Christopher Randles  Ross Galloway  Marsali Wallace 《International Journal of Science Education》2018,40(11):1367-1390

This paper describes the results of a comparative study into the approaches used by science undergraduates when solving open-ended problems. This study adopted a pseudo-grounded theory framework to analyse six case studies, one from each of the science disciplines studied. The study involved 70 participants from 5 institutions solving open-ended problems using a think-aloud protocol. Analysis of the data identified a number of different approaches used by each subject group. Participants in psychology, pharmacy and sports rehabilitation used a greater number of novice-like approaches than participants in chemistry, physics and interdisciplinary science. The approaches used by physical science participants were very similar whereas those from pharmacy, sports rehabilitation and psychology were more varied and relied on students’ ability to relate to a familiar context. Evaluation of the relative quality of solutions showed variation with discipline.  相似文献   

Institutional shaping of research priorities: A case study on avian influenza     

Matthew L. Wallace  Ismael Ràfols 《Research Policy》2018,47(10):1975-1989

Since outbreaks in 2003, avian influenza has received a considerable amount of funding and become a controversial science policy issue in various respects. Like in many other global and multidisciplinary societal problems fraught with high levels of uncertainty, a variety of perspectives have emerged over how to “tackle” avian influenza and public voices have expressed concern over how research funds are being allocated. In this article, we document if and how research agendas are being informed by public policy debates. We use qualitative and quantitative approaches to examine the relations between expectations of outcomes of public science and the existing research landscape. Interviews with a cross-section of stakeholders reveal a wide range of perspectives and values associated with the nature and objectives of existing research avenues. We find that the landscape of public avian influenza research is not directly driven by expectations of societal outcomes. Instead, it is shaped by three institutional drivers: pharmaceutical industry priorities, publishing and public research funding pressures, and the mandates of science-based policy or public health organizations. These insights suggest that, in research prioritization, funding agencies should embrace a broad perspective of research governance that explicitly considers underlying institutional drivers. Deliberative approaches in public priority setting might help to make agendas more plural and diverse and thus more responsive to the contested and uncertain nature of avian influenza research.  相似文献   

The relationship between the golf swing plane and ball impact characteristics using trajectory ellipse fitting     

Andrew Morrison  Denise McGrath  Eric S. Wallace 《Journal of sports sciences》2018,36(3):303-310

The trajectory of the clubhead close to ball impact during the golf swing has previously been shown to be planar. However, the relationship between the plane orientation and the orientation characteristics of the clubhead at ball impact has yet to be defined. Fifty-two male golfers (27 high skilled, 25 intermediate skilled) hit 40 drives each in an indoor biomechanics laboratory. This study successfully fitted the trajectory of the clubhead near impact to an ellipse for each swing for players of different skill levels to help better explain this relationship. Additionally, the eccentricities of the ellipses were investigated for links to skill level. The trajectory of the clubhead was found to fit to an ellipse with RMSE of 1.2 mm. The eccentricity of the ellipse was found to be greater in the high-skilled golfers. The club path and angle of attack generated from the ellipse fitted clubhead trajectory were found to have a normalised bias-corrected RMSE of 2% and 3%, respectively. A set of “rule of thumb” values for the relationship between the club path, angle of attack and delivery plane angle was generated for use by coaches.  相似文献   

Body composition of English Premier League soccer players: Influence of playing position,international status,and ethnicity     

Laura Sutton  Mark Scott  Joanne Wallace  Tom Reilly 《Journal of sports sciences》2013,31(10):1019-1026

Abstract

Body composition is a key consideration in the physical make-up of professional soccer players. The aims of the present study were to determine whether the body composition of professional soccer players varied according to playing position, international status or ethnicity, and to establish which variables best distinguished the soccer players from a reference group. Body composition was assessed using dual-energy X-ray absorptiometry in 64 male professional soccer players. Measured variables included bone mineral density and the relative amounts of lean and fat mass. Data were analysed using analysis of variance and stepwise discriminant function. The soccer players recorded better values than a reference group (n = 24) for all body composition compartments. Percent lean mass and bone mineral density were the variables best able to identify the soccer players (95.5% correctly classified). Differences in body composition were evident between goalkeepers and outfield players, but not between outfield playing positions. No differences were found on the basis of international status. The non-Caucasian players demonstrated significantly lower percent body fat (9.2 ± 2.0%) than the Caucasian players (10.7 ± 1.8%). It was concluded that body composition is important for elite soccer players, but that homogeneity between players at top professional clubs results in little variation between individuals.  相似文献   

Ball launch conditions for skilled golfers using drivers of different lengths in an indoor testing facility     

E. S. Wallace  S. R. Otto  A. Nevill 《Journal of sports sciences》2013,31(7):731-737

Abstract

The displacement of the golf ball struck by a driving club is affected by several player characteristics and equipment parameters and their interrelationships. Some modelling and simulation studies have shown a relationship between shaft length and clubhead speed, supported by a few experimental studies. The aim of the present study was to examine the relationship between driver length and ball launch conditions in an indoor test facility using a ball launch monitor. Nine males considered to be skilled golfers participated in the study. Four driving clubs of total length 117, 119, 124, and 132 cm were assembled from commercially available components and were used to strike golf shots while initial ball velocity, backspin rate, and launch angles were measured. Statistical analysis identified a significant difference in initial launch speed due to club length, a significant difference between participants, but no difference between the trials for a given golfer. A positive trend was noted between backspin and launch angle for all four clubs, and significant inverse associations between initial launch speed and backspin rate and launch angle. However, the combined launch conditions associated with increasing length were not considered optimal, with uncontrolled swingweight and moment of inertia effects considered to be limiting factors.  相似文献   

Determination of the swing technique characteristics and performance outcome relationship in golf driving for low handicap female golfers     

Susan J. Brown  Alan M. Nevill  Stuart A. Monk  Steve R. Otto  W. Scott Selbie  Eric S. Wallace 《Journal of sports sciences》2013,31(14):1483-1491

Abstract

Previous studies on the kinematics of the golf swing have mainly focused on group analysis of male golfers of a wide ability range. In the present study, we investigated gross body kinematics using a novel method of analysis for golf research for a group of low handicap female golfers to provide an understanding of their swing mechanics in relation to performance. Data were collected for the drive swings of 16 golfers using a 12-camera three-dimensional motion capture system and a stereoscopic launch monitor. Analysis of covariance identified three covariates (increased pelvis–thorax differential at the top of the backswing, increased pelvis translation during the backswing, and a decrease in absolute backswing time) as determinants of the variance in clubhead speed (adjusted r ² = 0.965, P < 0.05). A significant correlation was found between left-hand grip strength and clubhead speed (r = 0.54, P < 0.05) and between handicap and clubhead speed (r = ?0.612, P < 0.05). Flexibility measures showed some correlation with clubhead speed; both sitting flexibility tests gave positive correlations (clockwise: r = 0.522, P < 0.05; counterclockwise: r = 0.711, P < 0.01). The results suggest that there is no common driver swing technique for optimal performance in low handicap female golfers, and therefore consideration should be given to individual swing characteristics in future studies.  相似文献   

Positive behavioral contrast,autoshaping, and omission responding in the goldfish (Carassius auratus)     

Sarah W. Bottjer  Stanley R. Scobie  Julia Wallace 《Learning & behavior》1977,5(4):336-342

Two experiments with goldfish were performed to investigate the role of stimulus-reinforcer vs. response-reinforcer relationships in omission training and the role of stimulus localizability in a positive behavioral contrast paradigm. The directed behavior of fish, like that of pigeons and rats in other studies, was greatly influenced by positive stimulus-reinforcer correlations, as evidenced by maintained contacts of a signal for food, even though such responses terminated the signal and cancelled reinforcement delivery. Goldfish exhibited positive behavioral contrast when the signals for reinforcement and nonreinforcement were displayed directly on the response key, but no contrast was observed when variations in a diffuse houselight stimulus were used as signals for reinforcement or nonreinforcement. Analysis of sequential-trial data yielded effects analogous to Pavlovian positive and negative induction. Theoretical and methodological problems were briefly considered.  相似文献