A stochastic model for wound healing

We present a discrete stochastic model which represents many of the salient features of the biological process of wound healing. The model describes fronts of cells invading a wound. We have numerical results in one and two dimensions. In one dimension we can give analytic results for the front speed as a power series expansion in a parameter, p, that gives the relative size of proliferation and diffusion processes for the invading cells. In two dimensions the model becomes the Eden model for p near 1. In both one and two dimensions for small p, front propagation for this model should approach that of the Fisher-Kolmogorov equation. However, as in other cases, this discrete model approaches Fisher-Kolmogorov behavior slowly.Comment: 16 pages, 7 figure

EDUCATIONAL ADMINISTRATION AND QUEER EDUCATORS: BUILDING RELATIONSHIPS OF INCLUSION AND DIVERSITY

This collection represents a plethora of emergent perspectives on queer educators. We begin this collection starting in Canada with Tonya Callaghan’s empirical study, which illustrates the current struggles facing queer educators in Catholic schools in Alberta and Educational Administration and Queer Educators 5 Ontario. Jan Buterman uses life narrative as a transgender teacher in Alberta to demonstrate the “Meantime” that targets gender variance. Next, Kaela Jubas points out how internationalization strategies have implications for queer educators working at post-secondary institutions, and uses the University of Calgary as an example. This collection continues with the transnational work of Robert Mizzi, which points out the difficulties for gay men teaching internationally in adult education settings and compares the experiences of gay male expatriates working in Kosovo with gay male immigrants working in Toronto. This collection then takes another international turn in order to learn of some of the emergent issues facing queer educators in other countries and as a means to motivate further Canadian scholarship. Mitsunori Misawa brings attention to gay male professors of colour in the United States, and illustrates how both racism and homophobia intersect in the workplace despite the presence of equity policies. Last, we draw attention to recent developments in Australia, where Tania Ferfolja and Efty Stavrou present research from a national survey of lesbian and gay male K–12 teachers and their experiences creating a queer- positive culture and climate. As editors, we were thrilled to receive each of these papers as they advance the topic of queer educators and break new ground for further theory and research. We recognize that this collection gauges the current climate for queer educators in different work settings and realize that more work is to be done if we are to actually develop pluralistic and inclusive educational environments in Canada and elsewhere.

Penetration of Air Jets Issuing from Circular, Square, and Elliptical Orifices Directed Perpendicularly to an Air Stream

An experimental investigation was conducted to determine the penetration of air jets d.irected perpendicularlY to an air stream. Jets Issuing from circular, square, and. elliptical orifices were investigated. and. the jet penetration at a position downstream of the orifice was determined- as a function of jet density, jet velocity, air-stream d.enaity, air-stream velocity, effective jet diameter, and. orifice flow coeffIcient. The jet penetrations were determined for nearly constant values of air-stream density at three tunnel-air velocities arid for a large range of Jet velocities and. densities. The results were correlated in terms of dimensionless parameters and the penetrations of the various shapes were compared. Greater penetration was obtained. with the square orifices and the elliptical orifices having an axis ratio of 4:1 at low tunnel-air velocities and low jet pressures than for the other orifices investigated. The square orifices gave the best penetrations at the higher values of tunnel-air velocity and jet total pressure

G20 2014: perspectives from business, civil society, labour, think tanks and youth

This paper brings together policy contributions from a wide cross-section of society interested in feeding into the G20 process. Summary G20 engagement partners from Business (B20), Civil Society (C20), Labour (L20), Think Tanks (T20) and Youth (Y20) have each provided a contribution for this issue of the Monitor. Each address how the groups are organising their contribution to the G20 process in 2014, their priorities for the G20, and thoughts on what would constitute ‘success’ in terms of possible outcomes from the Brisbane Summit. The Australian G20 Sherpa, Heather Smith, has provided an opening comment. Key points One characteristic that all engagement partners share is their recognition of the importance of strengthening the G20. Through their engagement with the G20 presidency, the G20 engagement partners have an important role to play in communicating the G20’s work to the wider public for greater understanding. The engagement partners can use their networks to help convey what the G20 is doing, and why the involvement of the non-government sector is important

Loading range for the development of peak power in the close-grip bench press versus the traditional bench press

The close-grip bench press (CGBP) is a variation of the traditional bench press (TBP) that uses a narrower grip (~95% biacromial distance) and has application for athletes performing explosive arm actions where the hands are positioned close to the torso. Limited research has investigated CGBP peak power. Twenty-six strength-trained individuals completed a one-repetition maximum TBP and CGBP. During two other sessions, subjects completed two repetitions as explosively as possible with loads from 20% to 90% for each exercise, with peak power measured by a linear position transducer. A factorial ANOVA calculated between- and within-exercise differences in peak power. Partial correlations controlling for sex determined relationships between absolute and relative strength and peak power load. Peak power for the TBP occurred at 50% 1RM, and 30% 1RM for the CGBP. There were no significant (p = 0.680) differences between peak power at each load when comparing the TBP and CGBP. For the within-exercise analysis, there were generally no significant differences in TBP and CGBP peak power for the 20–50% 1RM loads. There were no significant relationships between strength and peak power load (p = 0.100–0.587). A peak power loading range of 20–50% 1RM for the TBP and CGBP is suggested for strength-trained individual

Lower-body power, linear speed, and change-of-direction speed in Division I collegiate women\u27s volleyball players

© 2020 Institute of Sport. All rights reserved. Volleyball players need to sprint and change direction during a match. Lower-body power, often measured by jump tests, could contribute to faster movements. How different jumps relate to linear and change-of-direction (COD) speed has not been analyzed in Division I (DI) collegiate women\u27s volleyball players. Fifteen female volleyball players completed the vertical jump (VJ), two-step approach jump (AppJ), and standing broad jump (SBJ). Peak power and power-to-body mass ratio (P:BM) were derived from VJ and AppJ height; relative SBJ was derived from SBJ distance. Linear speed was measured via a 20-m sprint (0-10 and 0-20 m intervals); COD speed was measured using the pro-agility shuttle. Pearson\u27s correlations (p \u3c 0.05) calculated relationships between the power variables, and speed tests. There were no significant relationships between the power variables and the 0-10 m sprint interval. Greater VJ height (r = -0.534) and P:BM (r = -0.557) related to a faster 0-20 m sprint interval. This be due to a greater emphasis on the stretch-shortening cycle to generate speed over 20 m. However, although a 20-m sprint may provide a measure of general athleticism, the distance may not be specific to volleyball. This was also indicated as the AppJ did not relate to any of the speed tests. Nonetheless, VJ height and P:BM, and SBJ distance and relative SBJ, all negatively correlated with the pro-agility shuttle (r = -0.548 to -0.729). DI women\u27s collegiate volleyball players could develop absolute and relative power in the vertical and horizontal planes to enhance COD speed

VALIDATION OF TWO MOBILE APPS TO PREDICT MAXIMAL STRENGTH

Through recent advances in smartphone technology, two mobile applications (apps), LizaPlus and PowerLift, have been developed to monitor strength training and predict 1RM based on maximal concentric velocity during submaximal exercises. The aim of this study was to assess the validity of the two apps to predict 1RM using the bench press exercise. Strong correlations were found between actual 1RM and predicted 1RM values (r-values: 0.80 to 0.86, p \u3c 0.001). Bland and Altman plots show a systematic bias such that predicted 1RMs tend to be higher than actual 1RM for both apps. Results indicate both apps are valid in predicting 1RM but there appears to be systematic bias to overestimate actual 1RM. Caution should be used when basing training loads on these predicted 1RM values as there is an increased risk of injury through prescription of excessive training load