Warm-up with baseball bats of varying moments of inertia: effect on bat velocity and swing pattern

The purpose of this study was to determine if warm-up with baseball bats of different moments of inertia has an effect on swing pattern and bat velocity. Ten experienced baseball players (ages 20-25 years) voluntarily participated in this study. Each participant was required to complete 10 dry swings (5 warm-up and 5 postwarm-up) at maximum effort within 3 different conditions. Post warm-up was always with a standard bat (I = .27 kgm2; 83.8 cm, 9.1 N). Warm-up for Condition 1 was with the standard bat. Condition 2 required participants to warm up with a standard bat plus a 6.1 N lead donut (I = .49 kgm2, 83.8 cm, 15.6 N). Condition 3 required participants to warm up with a hollow plastic bat (I = .08 kgm2; 83.8 cm, 3.34 N). Quantitative and qualitative analyses indicated that following warm-up with the weighted bat (largest moment of inertia), swing pattern was significantly altered, and post warm-up velocity was the lowest of the three conditions.     

Promoting toddlers' self-regulation and healthy eating habits among families living in poverty: A randomized controlled trial of Recipe 4 Success

The Recipe 4 Success preventive intervention targeted multiple factors critical to the health and well-being of toddlers living in poverty. This randomized controlled trial, which was embedded within Early Head Start home visits for 12 weeks, included 242 racially and ethnically diverse families (51% girls; toddler mean age = 2.58 years; data collected 2016–2019). Compared to parents in usual practice home visits, parents in Recipe 4 Success displayed greater sensitive scaffolding of toddlers' learning and more responsive food parenting practices (Cohen's d = .21–.30). Toddlers in Recipe 4 Success exhibited greater self-regulation and had healthier eating habits (Cohen's d = |.16–.35|). Results highlight the value of Recipe 4 Success in promoting parent and toddler behavior change that could have life-long benefits.     

Geometric algebra for the High School Program

Summary Plane affine geometry is developed from four axioms, up to the construction of a field (in general non-commutative), introduction of coordinates and derivation of equations for lines. The development is intended to be intelligible and rewarding to better high school students.     

Using a whole‐class token economy and coaching of teacher skills in a preschool classroom to manage disruptive behavior

The Level System is a whole‐classroom approach for managing disruptive behavior that utilizes behavioral management strategies such as a token economy, response cost, stimulating rewards, and strategic attention. Using an ABACC′ treatment comparison design with follow‐up, this study evaluated the effectiveness of the Level System in a preschool classroom compared to (a) strategies already employed by the teacher, and (b) coaching the teacher in the Child‐Directed Interaction (CDI) and Parent‐Directed Interaction (PDI) phases of Parent–Child Interaction Therapy (PCIT). Teacher‐ and parent‐report measures were administered, and behavioral observation data were collected for child and teacher behavior using videotapes. Results suggested that the amount of inappropriate behavior exhibited by children decreased when the Level System was implemented. Additionally, inappropriate behavior decreased further during the CDI and PDI conditions. © 2004 Wiley Periodicals, Inc. Psychol Schs 41: 351–361, 2004.     

Experiential Learning in Social Science Theory: An investigation of the relationship between student enjoyment and learning

This paper provides an analysis of student experiences of an approach to teaching theory that integrates the teaching of theory and data analysis. The argument that supports this approach is that theory is most effectively taught by using empirical data in order to generate and test propositions and hypotheses, thereby emphasising the dialectic relationship between theory and data through experiential learning. Bachelor of Commerce students in two second-year substantive organisational theory subjects were introduced to this method of learning at a large, multi-campus Australian university. In this paper, we present a model that posits a relationship between students' perceptions of their learning, the enjoyment of the experience and expected future outcomes. The results of our evaluation reveal that a majority of students: ’ enjoyed this way of learning; ’ believed that the exercise assisted their learning of substantive theory, computing applications and the nature of survey data; and ’ felt that what they have learned could be applied elsewhere. We argue that this approach presents the potential to improve the way theory is taught by integrating theory, theory testing and theory development; moving away from teaching theory and analysis in discrete subjects; and, introducing iterative experiences in substantive subjects.     

Dynamics of Illegal Participation in Peer-to-Peer Networks—Why Do People Illegally Share Media Files?

In 1997, a law was passed in Spain that mandated that “broadcastings of general interest” be free-to-air rather than pay-per-view. Since that time, a soccer match of the Spanish First Division—considered a public benefit activity—can be viewed on a weekly basis for free throughout the regular season. The aim of this article is to determine whether a “general interest” for these free-to-air broadcastings exists. To perform the empirical analysis, a demand equation for a TV audience is estimated using a unique panel data set on a regional level, in which the dependent variable is the number of viewers of free-to-air matches in each Spanish region during the period 2008–2012. The model specifications consider whether a particular region has a team competing in the First Division and other socioeconomical and sporting variables. The results conclude that a nationwide “general interest” in free-to-air broadcasting of soccer matches, which would support Spanish law, does not exist, with the exception of matches played by Real Madrid Club de Fútbol, Fútbol Club Barcelona, and local teams.     

Messages About Sex on Israeli Television: Comparing Local and Foreign Programming

A content analysis of 584 prime-time programs examines messages about sex on Israeli television, comparing local and foreign shows. A 2-week composite sample from 7 commercial broadcast, cable, and satellite channels is analyzed. Results show that sexual content is highly prevalent, with a significantly higher frequency in foreign than local shows. Less than 20% of programs with sexual content address sexual health and risks; foreign shows again exceed local ones. Few differences emerge between local and foreign content in the contextual presentation of sex. Findings are discussed in light of theory, research, and implications for audience effects, policy, and education.