Analysis of speed accuracy using video analysis software

Determining an athlete’s speed from broadcast video is a common practice in sport. Many software packages that perform data extraction from video files are expensive; however, open source software is also available, but lacks published validation for speed measurements. The purpose of this research was to examine the error of speed measurements extracted from video during an ice hockey skating exercise using open source software. The subject completed four exercises, at two speeds recorded by broadcast cameras set at five angles. The speeds from the broadcast cameras were compared to speeds calculated from a high-speed camera placed orthogonally to the exercise. Speeds from the broadcast cameras correlated well with the high-speed video for motion more than 12 m away from the broadcast camera. When comparing all the measured speeds, no significant difference was found between the speeds calculated by the high-speed camera (slow: 4.46 m/s ± 0.2; fast: 7.2 m/s ± 0.7) and the speed calculated from the broadcast cameras (slow: 4.50 m/s ± 0.4; fast: 7.34 m/s ± 0.6) (p > 0.05). The open source method was found to be less accurate when the athlete was close to (within 12 m of camera position) or moving directly toward the broadcast cameras.     

BACKGROUND CHARACTERISTICS AS PREDICTORS OF ACADEMIC SELF-CONFIDENCE AND ACADEMIC SELF-EFFICACY AMONG GRADUATE SCIENCE AND ENGINEERING STUDENTS

This study uses data from the 1995-96 Graduate Experience Project to explore differences among, and possible predictors of, academic self-confidence, academic self-efficacy, and outcome expectations of entering graduate students in science and engineering. The results suggest that at time of entry, women and U.S. minority graduate students entered with similar academic credentials and academic expectations as their Anglo male peers. Further, gender was not found to be a significant factor in predicting academic self-confidence, academic self-efficacy, or careerrelated outcome expectations. Rather, student perceptions of academic preparedness, status-related disadvantages, and expectations about faculty/student interactions emerged as significant predictors of academic self-efficacy and career-related outcome expectations.     

Effectiveness of antigraffiti treatments in connection with penetration depth determined by different techniques

The elimination of spray paint using traditional (chemical and mechanical) methods inevitably entails altering surface characteristics. Hence, the impact and deterioration caused by graffiti in heritage buildings and monuments have led to the development and application of preventive systems in the form of antigraffiti coatings (which prevent paint from seeping into the pores of the surface material and facilitate cleaning). The effectiveness of two of these treatments, a commercial product (fluoroalkyl siloxane, protectosil, marketed by Degussa) and a hybrid organic-inorganic material (Ormosil), was evaluated in five construction materials (limestone, granite, cement mortar, lime mortar and brick), in terms of their penetration into the substrate. A number of techniques were used to determine the penetration depth (SEM/EDX, micro-Raman and LIBS), because a comparative analysis showed that none was universally valid for all types of treatments. The results show that the presence of the coating on the surface of less porous materials only ensures effective cleaning when the surface is fairly smooth. In granite, for instance, the CF₃ terminals in the fluorinated treatment hinder spray paint bonding more effectively than Ormosil, but not efficiently enough to ensure complete removal of the paint from granite surfaces.     

Changing knowledge and the academic profession in Portugal

The paper analyses the Portuguese academics' perceptions about changes in their research activities and modes of knowledge production. Quantitative data gathered from an on‐line national survey have been used to develop this analysis. Results reveal that the majority of academics declared that they were not involved in knowledge and technology transfer and that their research activities were not influenced by external sponsors or clients. However, they did recognise that were strong external pressures to reconfigure the epistemologies, ontologies and the institutional conditions under which knowledge is produced. The data analysis also reveals that academics recognise forms of hybridism between autonomy and endogenous dynamics and heteronomy and exogenous dynamics in the development of their research activities and knowledge production.     

Critical Race Theory and the Transfer Function: Introducing a Transfer Receptive Culture

In California, the majority of students of color who enter postsecondary education do so in the community colleges. However large numbers of them leave and do not transfer to four-year institutions; in particular to highly selective public four-year colleges and universities. By using the theoretical perspective of critical race theory, transfer can be seen as a dual commitment between both the sending and receiving institution as we put forth the conceptual framework of a “transfer receptive culture.” We define a transfer receptive culture as an institutional commitment by a four-year college or university to provide the support needed for students to transfer successfully—that is, to navigate the community college, take the appropriate coursework, apply, enroll, and successfully earn a baccalaureate degree in a timely manner. We outline five elements, informed by critical race theory, that are necessary to establish a transfer receptive culture and outline specific strategies within each element that practioners can employ on their home campuses.     

Gender Differences on Research: The perceptions and use of academic time

In the last years, the increasing pressure over higher education institutions to promote alternative non‐state funding sources has lead to an increasing importance given to research and, more specifically to applied research. The notion that women dedicate less time to research may be seen in the new context, as a prominent threat for women to reach universities top positions. In this article, which draws from an exploratory study case of two public universities in Portugal, we examine whether there are gender differences on perceptions about time dedicated to different academic activities. Findings reveal no significant gender differences in the academics' perceptions about their work.     

Opportunities to Learn and Achievement in Mathematics in a Sample of Sixth Grade Students in Lima, Peru

In recent years, the mathematics achievement of Peruvian students has been evaluated in three national and two international studies. The results in all cases suggest very poor learning. A similar situation is found in many developing countries. In this study, we analyzed the opportunities to learn (OTL) mathematics of sixth grade students from 22 public schools in Lima, Peru. OTL were defined in this study as curriculum coverage, cognitive demand of the tasks posed to the students, percent of mathematical exercises that were correct and quality of feedback. These variables were coded in the workbooks and notebooks of the students, which were gathered at the end of the school year (at the same time, the mathematics achievement test was administered). The results show that: (a) regarding OTL, less than half of the exercises available in the workbooks were solved, teachers overemphasize some topics of the national curriculum ({i.e.} related to Number and Number Sense), they pose tasks that are at very low levels of cognitive demand, and it is common to find mistakes in the students' answers to problems that have no feedback (or even worse, the feedback is wrong); (b) students in relatively poorer, multigrade classrooms have less OTL; (c) OTL, as defined earlier, is positively associated with achievement.A preliminary version of this paper received the Research Medal in the category Knowledge, Education andTechnology at the Annual Meeting of the Global Development Network (GDN) in Cairo, in January 2003.