The effect of a flexed elbow on bowling speed in cricket

The laws of bowling in cricket state 'a ball is fairly delivered in respect of the arm if, once the bowler's arm has reached the level of the shoulder in the delivery swing, the elbow joint is not straightened partially or completely from that point until the ball has left the hand'. Recently two prominent bowlers, under suspicion for transgressing this law, suggested that they are not 'throwing' but due to an elbow deformity are forced to bowl with a bent bowling arm. This study examined whether such bowlers can produce an additional contribution to wrist/ball release speed by internal rotation of the upper arm. The kinematics of a bowling arm were calculated using a simple two-link model (upper arm and forearm). Using reported internal rotation speeds of the upper arm from baseball and waterpolo, and bowling arm kinematics from cricket, the change in wrist speed was calculated as a function of effective arm length, and wrist distance from the internal rotation axis. A significant increase in wrist speed was noted. This suggests that bowlers who can maintain a fixed elbow flexion during delivery can produce distinctly greater wrist/ball speeds by using upper arm internal rotation.     

Patient education and health outcomes: implications for library service

Many librarians take an active role in patient education, for practical and ethical reasons; however, it is important to examine the effect of such activities on health outcomes. Although the rationale for patient education is that increased knowledge leads to a change in attitude that in turn affects behavior, studies have shown that this is not always true. Furthermore, other studies have shown that patient education programs by themselves have no lasting influence on patient compliance with therapy that has been linked to improved health. Librarians should examine a variety of reasons for their involvement in patient education activities. For librarians who accept improved patient compliance as a goal, specific recommendations based on literature review are made to help implement effective strategies.     

Spaces for Change: Gender and Technology Access in Collaborative Software Design

Equitable computer collaborations in mixed-gender teams have been a pressing issue for many years. While some have argued for creating single-gender teams or girls-only computer activities, our approach was different. The current study examines a three-month software design activity in which mixed teams of girls and boys (10–12 year olds) designed and implemented multimedia astronomy resources for younger students. In this context we assessed gender differences in students' levels of access to technology and how these participation patterns changed throughout the project duration. We found through our qualitative analyses that the configuration of social, physical and cognitive spaces in the project environment contributed to a positive change in girls' levels of access. We discuss the implications of these results in regard to issues surrounding the development and maintenance of gender equity in computer use and further research.     

Innovation in PhD completion: the hardy shall succeed (and be happy!)

What is it that makes a PhD such a difficult process, and prevents candidates from completing on time? In this paper, we propose that self‐sabotaging behaviours, including overcommitting, procrastination and perfectionism, have a role to play. At Flinders University, we have developed a program in which we work with PhD students to help to reduce these behaviours and give them the strategies and attitudes they need to successfully (and happily!) complete their thesis. The program utilises cognitive–behavioural coaching, an evidence‐based strategy that we claim leads to significant and long‐term behavioural change. An evaluation of the program indicates that it is very successful, improving students’ ability to manage their time, set specific times for writing, and show work to their supervisor regularly, and that these behaviours were associated with lower levels of stress and improved ability to complete.     

Philosophy as Literature

How best to introduce philosophical ideas? Is the best and only way by studying the history of philosophy and its rational arguments and discussions? But can literature, usually hived off from philosophy, be used instead and can this be as effective as rational argument? This paper explores these questions. First it considers a text which introduces philosophy through the analysis of literature, in particular James Joyce's 'Araby', arguing that the traditional analytic approach employed by the text, by concentrating on epistemology, obscures other philosophical insights offered by Joyce. It then turns to French philosophy and literature and suggests that Sartre, Beauvoir and Camus by 'blurring' the analytic distinction between philosophy and literature have much to offer to the grasping and understanding of philosophical ideas and principles.     

Students' mathematical modeling of motion

We present results of an investigation of university students' development of mathematical models of motion in a physical science course for preservice teachers and graduate students in science and mathematics education. Although some students were familiar with the standard concepts of position, velocity, and acceleration from physics classes, most students had difficulty using these concepts to characterize actual or hypothetical motions. Furthermore, some students developed their own nonstandard method of describing accelerated motion in terms of changes in the average velocity, from the start of the motion up to a given time. This is in contrast to the physics community's use of the acceleration construct, defined in terms of changes in the instantaneous velocity, to describe such motion. Although the change in average velocity is not typically identified as an important construct in traditional physics texts, some students found it intuitively appealing, and were able to use it successfully to describe and predict motion. We conclude that by focusing on standard constructs, and ignoring possible intuitive ways that students might view motion, standard kinematics instruction may miss an opportunity to maximize student understanding. © 2007 Wiley Periodicals, Inc. J. Res. Sci. Teach 45: 153–173, 2008.     

How schools and students respond to school improvement programs: The case of Brazil's PDE

This study uses rich empirical data from Brazil to assess how a government program (PDE) that decentralizes school management decisions changes what goes on in schools and how these changes affect student outcomes. It appears that the PDE resulted in some improvements in management and learning materials, but little change in other areas including evaluation and community relations. However, we find no evidence that schools’ participation in the PDE improved student achievement. The results for grade passing are stronger. Students in PDE schools saw greater increases in grade passing rates than students in non-PDE schools during the period of our study. We also estimate a positive relationship between PDE spending and student gains for those schools in the program, especially for spending on teaching and learning materials and furniture. We find no benefit of electronics spending or spending on teacher training, two of the three largest areas of school investment.     

Measuring the value and impact of health library and information services: past reflections, future possibilities

Objectives: To summarize the context, history and results of research studies conducted on the value and impact of health library and information services by the author since 1975 and to use this as a basis for examining ongoing developments related to evaluation research. To provide a comprehensive bibliography of library value and impact studies. Methods: Literature review and background based on personal involvement in the studies under discussion. Results: The author's studies demonstrate an ongoing evolution of value and impact studies since the mid‐1970s. In health sciences libraries, the approach taken to measuring value and impact has been strongly influenced by the type of research being conducted in the health sciences field as a whole. As a result, health sciences library researchers have become early adopters of methods that incorporate outcome and impact measures and rigorous research designs, and the concept of evidence‐based library and information practice. The paper recommends that a range of research approaches from various disciplines be used to guide future evaluation research. Conclusions: Value and impact studies will continue to be important resources for evidence‐based practice as health information professionals deal with evolving user needs and new ways of delivering information to a variety of audiences.     

说声"谢谢"就好

呵斥别人出于善意的良言,只会使我们自己的形象大打折扣。何不学着感恩?感恩的心,感谢有你,伴我一生。