The influence of Cardan rotation sequence on angular orientation data for the lower limb in the soccer kick

Abstract

The influence of the Cardan rotation sequence on the orientation angles for joints is well known but has not been explored for dynamic sports movements. The purpose of this study is to establish the influence of Cardan rotation sequence on the orientation angles of the ankle, knee, and hip of the support leg and pelvis during dynamic sports movements, typified by a maximal instep kick in soccer. We found that: (a) the X (flexion/extension) axis rotations provide data that are robust for any sequence used other than the YXZ sequence, although the Y (abduction/adduction) and Z (internal/external) axes rotations are variable in both shape and offset magnitude; (b) the preferred rotation sequence is either XYZ or XZY for dynamic sports movements, although for the soccer kick the XYZ rotation sequence has been widely used and so this is recommended as a standard; and (c) most uncertainties exist in the Y and Z axes and are most apparent at the beginning of the movement. Where uncertainty exists in identifying Y and Z axes orientations, the integrated angular velocity may be considered as an alternative to determine the relative changes in segment orientation.     

Visualization of Twitter Data in the Classroom

The expression “big data” is ubiquitous in the business world today, but few undergraduate business students have the opportunity to gain practical experience with how new business analytics tools can be used in decision making. This article describes a set of hands‐on labs that prepare students to incorporate streaming data analysis into group research projects. Splunk is used to help students analyze and visualize streaming social media data. An evaluation of student projects and student survey results show that this practical approach of training students to manipulate and visualize big data was largely successful in achieving instructional goals.     

What would make them read more? Insights from Western Australian adolescents

The link between recreational book reading and improved literacy performance is consistently supported by educational research. Increasing engagement in recreational book reading remains imperative for English teachers, though how to best facilitate this in a secondary context is an object of contention, with limited research in this field. The West Australian Study in Adolescent Book Reading explored attitudes and engagement in recreational book reading. Student responses provide valuable insight directly from the target group that can help to shape best practice for adolescent literacy educators. Findings are presented around six key themes, and include strategies for choice, access to attractive and diverse books, time availability, time allocation, concentration and encouragement.     

Using Virtual Field Trips to Connect Students with University Scientists: Core Elements and Evaluation of zipTrips?

Physical field trips to scientists?? work places have been shown to enhance student perceptions of science, scientists and science careers. Although virtual field trips (VFTs) have emerged as viable alternatives (or supplements) to traditional physical fieldtrips, little is known about the potential of virtual field trips to provide the same or similar science career exploration advantages as physical field trips. The overarching goal of this paper is to describe a VFT, zipTrips?, designed to provide middle school students, especially those in resource limited rural areas, with access to university scientists. Using zipTrips as a case example, the paper identifies and describes some of the core characteristics and elements of high quality authentic VFTs that foster student-scientist interactions. In addition, the paper uses program evaluation data to examine the impact of zipTrips on student perceptions of scientists.     

Data use by Flemish school principals: impact of attitude,self-efficacy and external expectations

There is an increasing expectation that school principals use data to develop and justify school policy. There is also a strong belief among a wide variety of stakeholders that the quality of decisions within the school increases in proportion to the extent to which these decisions are based on good data. In most schools, however, it appears that data use is still quite limited. Research shows that the school principal plays a key role in data use in schools. In the present study, we examine the impact of external expectations, attitude and self-efficacy on the use of data by principals. The results of a survey among 451 school principals in Flanders show that affective aspects of attitude exhibit the strongest correlation with data use by principals. The impact of cognitive attitude and self-efficacy is statistically significant, but quite limited. The same applies to the perception of external school development-orientated and accountability-orientated expectations to use data.     

Are Student Protests in Arab States Caused by Economic and Political Grievances? Empirical Evidence from the 2006–07 Arab Barometer

We investigate the nature of protests by students (age 18 and older) in Algeria, Jordan, Morocco, and Yemen by using subsamples of students from nationally representative and acclaimed public opinion data (the 2006–07 Arab Barometer). We find between 22.1% (Jordan) and 54.7% (Yemen) participated in either the signing of petitions, or marching in street protests, or both between the years 2003–07. To explain student protest participation, we draw from the political economy literature to test four grievance-based hypotheses that link protest to student perceptions on the performance of the economy, personal family socioeconomic status, political exclusion, and preference for democracy. Ordered probit regression analyses indicate that students protest for different reasons in the four countries. We find statistical evidence that student protests are associated with grievances about the economy (Algeria and Morocco) and lack of democracy (Algeria only). Joint hypothesis tests reveal that the four grievances jointly matter in Algeria, Morocco, and Yemen but not Jordan.     

Cognitive preconditions of early reading and spelling: a latent-variable approach with longitudinal data

The aim of the present study was to empirically disentangle the interdependencies of the impact of nonverbal intelligence, working memory capacities, and phonological processing skills on early reading decoding and spelling within a latent variable approach. In a sample of 127 children, these cognitive preconditions were assessed before the onset of formal education, whereas reading as well as spelling achievement was measured at the end of grade 1. The findings indicate that working memory does contribute to the prediction of early reading and spelling, and that this contribution outperforms that of general intelligence and phonological recoding from long-term memory during the early steps of reading and spelling acquisition. Moreover, the results show that phonological awareness mediates the effects of working memory capacities on early literacy outcomes. The role of working memory and phonological awareness as key cognitive preconditions of early reading and spelling are discussed.     

Using communities of practice to enhance interdisciplinary teaching: lessons from four Australian institutions

We report on the establishment of communities of practice at four Australian institutions and evaluate their effectiveness and durability as a means of building staff and institutional capacity for interdisciplinary teaching. A community of practice approach is a potentially valuable methodology for overcoming dynamics of fragmentation, isolation and competition within universities. The communities we established were anchored by a shared focus on the topic of climate change and they worked collaboratively to build relationships of trust and reciprocity between teachers in a wide range of disciplines. The aim of each community was to improve the teaching of climate change through enabling members to integrate diverse disciplinary perspectives, to teach collaboratively, to promote innovation through exchange and to demonstrate leadership within their institutions. The key factors that made our communities effective and durable are: (1) designation of two leadership roles, activator and facilitator, (2) provision for institutional autonomy in domesticating the model to fit local circumstances and (3) a pragmatic emphasis on opportunities for teaching innovation and leadership within existing administrative structures, teaching programs and workloads. We conclude that suitably designed and resourced communities of practice are a viable means of improving interdisciplinary teaching of complex problems by facilitating both staff development and institutional learning.     

Reconnecting the Disconnects: Library Outreach to Faculty as Addressed in the Literature

While academic librarians have always sought to create the best services for college faculty and students, the increasingly self-defined “teacher-librarian” needs more than ever to promote positive relationships and collaboration with classroom faculty. Based on a review of library literature, this article explores the nature of several disconnects between librarians and college or university faculty and examines the ways in which library outreach to faculty in its various forms seeks to bridge those gaps. The author maintains that library outreach addresses the issues between librarians and may result in higher levels of advocacy, collaboration, and collegiality.