Hydrodynamics of undulatory underwater swimming: A review

Undulatory underwater swimming (UUS) occurs in the starts and turns of three of the four competitive swimming strokes and plays a significant role in overall swimming performance. The majority of research examining UUS is comparative in nature, dominated by studies comparing aquatic animals' undulatory locomotion with the UUS performance of humans. More recently, research directly examining human forms of UUS have been undertaken, providing further insight into the factors which influence swimming velocity and efficiency. This paper reviews studies which have examined the hydromechanical, biomechanical, and coordination aspects of UUS performance in both animals and humans. The present work provides a comprehensive evaluation of the key factors which combine to influence UUS performance examining (1) the role of end-effector frequency and body amplitudes in the production of a propulsive waveform, (2) the effects of morphology on the wavelength of the propulsive waveform and its subsequent impact on the mode of UUS adopted, and (3) the interactions of the undulatory movements to simultaneously optimise propulsive impulse whilst minimising the active drag experienced. In conclusion, the review recommends that further research is required to fully appreciate the complexity of UUS and examine how humans can further optimise performance.     

Extending Validity Evidence for Multidimensional Measures of Coaching Competency

This study extended validity evidence for multidimensional measures of coaching competency derived from the Coaching Competency Scale (CCS; Myers, Feltz, Maier, Wolfe, & Reckase, 2006) by examining use of the original rating scale structure and testing how measures related to satisfaction with the head coach within teams and between teams. Motivation, game strategy, technique, and character building comprised the dimensions of coaching competency. Data were collected from athletes (N = 585) nested within intercollegiate men's (g = 8) and women's (g = 13) soccer and women's ice hockey (g = 11) teams (G = 32). Validity concerns were observed for the original rating scale structure and the predicted positive relationship between motivation competency and satisfaction with the coach between teams. Validity evidence was offered for a condensed post hoc rating scale and the predicted relationship between motivation competency and satisfaction with the coach within teams.     

Sources of continuity and change in activity level in early childhood

Actigraphs and parent and observer ratings were used to explore genetic influences on continuity and change in activity level (AL) in early childhood. Over 300 pairs of twins wore actigraphs for a 48-hr period in the home and laboratory at ages 2 and 3. AL was genetically influenced at both ages with little evidence of differential heritability across age. For all measures, genetic influences contributed to phenotypic continuity. With the exception of the actigraph measure of AL in the home, new genetic effects emerged at age 3 indicating that genetic factors influence both continuity and change in AL in early childhood. Nonshared environmental influences were also a source of change in AL across the transition from infancy to early childhood.     

Mexican-Origin Adolescent Mothers’ Economic Contexts,Educational Re-Engagement,and Their Children’s School Readiness

Drawing on data from a longitudinal study of 204 Mexican-origin adolescent mothers, their mother figures, and their children, the current investigation examined (a) adolescent mothers’ educational re-engagement and attainment beginning during their pregnancy and ending when their child was 5 years old; and (b) the influence of the family economic context on adolescent mothers’ educational re-engagement and attainment and their children’s academic and social-emotional outcomes. Findings detailed adolescent mothers’ re-engagement in school after the birth of their child and revealed that family income during adolescents’ pregnancies was directly associated with re-engagement and attainment, and also initiated cascade effects that shaped adolescents’ economic contexts, their subsequent re-engagement and attainment, and ultimately their children’s academic and social-emotional outcomes at age 5.     

Voluntary use of online study questions as a function of previous minimal use requirements and learner aptitude

This study investigates voluntary use of online study questions, the relationship of study question use to examination performance, and the relationship of aptitude to study question use following an initial phase during which students either received course points for passing mastery quizzes or for completing a designated number of study questions. The results indicate a) students who first received points for completing study questions later made greater voluntary use of study questions, b) less able readers made less voluntary use of study questions than more able readers, and c) less able readers performed better on course examinations when awarded course points for completing a required number of study questions rather than quizzes.     

Assessment of an online piloted module targeted toward home‐based food operators in Iowa

Understanding safe food practice is important for home‐based food operators to prevent foodborne illness. Earlier work has found that home‐based food operators lack food safety knowledge and may benefit from training that is specifically tailored to their needs. Unfortunately, home‐based food operators may be deterred from enrolling in traditional educational formats due to their busy schedules. The objective of this study was to pilot and evaluate the effectiveness of an online food safety education module for home‐based food operators in Iowa through three learning assessments. Twenty‐one participants enrolled in a blended workshop in which participants completed one online module before attending a face‐to‐face session where they completed the remaining five modules. The effectiveness of the online module was measured by examining the first‐attempt average scores on learning assessments, the number of assessment attempts required to achieve 100%, and the first‐attempt performance by question type. The three learning assessment tools resulted in first‐attempt averages of approximately 86%, 90%, and 83%, surpassing our standard of effectiveness of 75% and showing good potential for the online format. The learning assessment attempt numbers of 4.65, 1.67, and 3.81 showed difficulty with knowledge transfer for some topics. Comprehension and analysis‐style questions had first‐attempt success rates of approximately 85% and 88%, respectively. Scores on knowledge and application‐style questions were lower with first‐attempt success rates of approximately 80% and 75%, respectively. These findings were used to improve the first online module and guide the transition of the remaining five modules to the online format.     

Population education in the USA

By the late 1960s, universities and private organizations began to develop population education programs and courses in the wake of the warning of demographer Philip M. Hauser about the lack of demographic information in the school curriculum. In the early 1970s, the US Department of Health, Education, and Welfare provided limited funding for teacher training workshops and classroom materials. Baltimore City's district wide population education program proved successful in 1975 after 10 years of work, population education materials were adopted in the official social studies curriculum, and this model was accepted later by other school systems. In 1979 not quite 15 US colleges and universities taught population issues at graduate-level training or by offering workshops and materials. By the mid-1970s, universities and private organizations were conducting conferences and workshops for secondary school teachers. In the 1970s, these included the Center for Information on America. Environment-Population Education Services, Planned Parenthood, Population Institute, Population Reference Bureau (PRB), the World Bank, and Zero Population Growth (ZPG). In the 1970s and early 1980s various other organizations contributed to population educations, e.g. the University of Cincinnati by organizing institutes, the National Catholic Educational Association representing 8200 schools ZPG with teacher-training workshops, and PRB with meaningful materials for students and teachers. The state of population education in 1992 means that PRB staff lead 15-30 workshops each year and provide workshop materials for teachers. ZPG emphasizes hands-on learning. Pet Net, a network of volunteer teacher trainers leading workshops, and ZPG staff conducted 88 workshops in 1991.     

A rationale for differentiated staffing

The improvement of staff utilization practices through the technique of differentiated staffing is the subject of this paper. The authors bring together the various definitions of the term differentiated staffing and propose a more inclusive definition. Drawing from the literature in organizational change, the authors document in a logical and systematic manner the parameters of differentiated staffing and the problems that are likely to be associated with its introduction. The major part of the paper analyzes the potential of differentiated staffing for improving many deficiencies that are apparent in present methods of utilizing professional personnel in the public schools and in the decision-making procedures of those organizations. The authours urge controlled and systematic pilot projects be undertaken before largescale or even system-wide adoption.

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Résumé Le sujet de cette étude porte sur l'amélioration des méthodes d'utilisation du personnel au moyen de la technique de la différenciation du personnel. Les auteurs regroupent les diverses définitions de l'expression différenciation du personnel et proposent une définition plus globale. En s'inspirant des documents relatifs aux changements structuraux en matière d'organisation, les auteurs appuient sur des documents, d'une manière logique et systématique, leur idée des paramètres de la différenciation du personnel et des problèmes qui vraisemblablement accompagneront sa mise en application. Cette étude est consacrée principalement à l'analyse des possibilités qu'offre la différenciation du personnel en vue d'améliorer les nombreuses lacunes que l'on constate à l'égard des méthodes actuelles d'utilisation du personnel qualifié dans les écoles publiques et au niveau des méthodes de prise de décision des ces organismes. Les auteurs préconisent le recours à des projets pilotes méthodiques et bien dirigés avant que cette nouvelle technique soit adoptée sur une vaste échelle ou même à celle du système.

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The authors wish to express their appreciation to the following for their helpful criticisms of an earlier draft of this paper: Dr. John Brubacher, Dept. of Educational Administration, University of Connecticut, Storrs; Dr. Walter J. Hartrick, Centre for the Study of Education Administration, The University of British Columbia, Vancouver; Dr. James L. Olivero, The Southwestern Cooperative Educational Laboratory, Albuquerque, New Mexico; Dr. Philip J. Runkel, Center for the Advanced Study of Educational Administration, University of Oregon, Eugene.     

When Is Teleconsultation Acceptable to School Psychologists?

ABSTRACT

School psychologists report a desire to increase consultation with teachers but are limited by competing job demands. Consultation via videoconference (i.e., teleconsultation) offers one possible means of increasing consultant availability to teachers, but little is known about the acceptability of this technology in actual practice. In this exploratory study, we conducted an online survey to assess the conditions under which school consultants would use teleconsultation to assist teachers remotely. Sixty-two school psychology practitioners, trainers, and trainees completed a choice-based conjoint survey designed to assess teleconsultation acceptability in the context of varying commute times, consultee comfort levels, and student problem severities. Findings suggest important differences in teleconsultation acceptability in the context of real-world tradeoffs. Implications of these results are discussed, as well as the potential for using conjoint analysis to better understand technology decisions among school consultants.