The sports science of curling: a practical review [with radio interview]

Includes radio interview discussing the paper (Bradley, John L. 2009. The sports science of curling: a practical review. Journal of Sports Science and Medicine, 8 (4), pp.495-500.) with Chris Walker on 'Daybreak', Canadian Broadcasting Corporation, radio show on 26 February 2010.Curling is a sport played on ice in which two teams each deliver 8 granite stones towards a target, or 'house'. It is the only sport in which the trajectory of the projectile can be influenced after it has been released by the athlete. This is achieved by sweeping the ice in front of the stone to change the stone-ice friction and thereby enable to stone to travel further, curl more or stay straight. Hard sweeping is physically demanding. Different techniques of sweeping can also have different effects on the stone. This paper will review the current research behind sweeping a curling stone, outline the physiological demands of sweeping, the associated performance effects and suggest potential strategies of sweeping that can be used by both coaches and curling teams

Microstress in the matrix of a melt‐infiltrated SiC/SiC ceramic matrix composite

Microstress in the SiC: Si matrix of a ceramic matrix composite (CMC) has been characterized, using Raman spectroscopy. The matrix of the composite was manufactured using liquid melt infiltration, and has about 20% unreacted free silicon. During the processing of the composite, the unreacted free silicon expands 11 vol% when transforming from liquid to solid. This crystallization expansion creates compressive microstress in the silicon phase of the matrix, which ranges from 2.4 to 3.1 GPa, and tensile microstress in the SiC of the matrix which ranges from 0.24 to 0.75 GPa. The microstress varies significantly with position, following a normal distribution.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/138911/1/jace15038_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/138911/2/jace15038.pd

School sport and academic achievement

ABSTRACT BACKGROUND: Physical Education and School Sport (PESS) is an integral part of the school curriculum in Ireland. Historically the Healthy Body, Healthy Mind philosophy has promoted the inclusion of PESS alongside more cognitive school subjects and research suggests that PESS can promote cognitive function and provide educational benefits. However there is little research on how the choice of school sport influences academic achievement. This case study aims to investigate how participation in school sport influences the Leaving Certificate points score in an Irish secondary school. In particular, the study will investigate how the particular sport chosen by students participating in school sport during their Leaving Certificate years influences their Leaving Certificate results. METHODS: The study recorded the Leaving Certificate scores and sporting participation from 402 school children graduating from an all-boys secondary school in the Republic of Ireland during the period 2008-2011. Sports participation was assigned one of four categories: Rugby; Rowing; Soccer; No Sport. RESULTS: Participation in a sport during the Leaving Certificate years conferred a 25.4 point benefit to the final Leaving Certificate score. However, participation in Rowing, the only individual sport available in the study, resulted in significantly higher Leaving Certificate scores than Rugby, Soccer and No Sport (p < .05), conferring an additional 73.4 point benefit over the next highest group, Rugby. CONCLUSION: Promoting participation in school sport and providing access to a range of team and individual sports throughout the secondary school years may be a beneficial way to improve students Leaving Certificate results

SACSIM: An applied activity-based model system with fine-level spatial and temporal resolution

AbstractThis paper presents the regional travel forecasting model system (SACSIM) being used by the Sacramento (California) Area Council of Governments (SACOG). Within SACSIM an integrated activity-based disaggregate econometric model (DaySim) simulates each resident's full-day activity and travel schedule. Sensitivity to neighborhood scale is enhanced through disaggregation of the modeled outcomes in three key dimensions: purpose, time, and space. Each activity episode is associated with one of seven specific purposes, and with a particular parcel location at which it occurs. The beginning and ending times of all activity and travel episodes are identified within a specific 30-minute time period. Within SACSIM, DaySim equilibrates iteratively with traditional traffic assignment models. SACSIM was calibrated and tested for a base year of 2000 and for forecasts to the years 2005 and 2035, and was subjected to a formal peer-review. It was used to provide forecasts for the Regional Transportation Plan (RTP) and continues to be used for various policy analyses.The paper explains the model system structure and components, the integration with the traffic assignment model, calibration and validation, sensitivity tests, model application and Federal peer review results. We conclude that it is possible to create and apply a regional demand model system using parcel-level geography and half-hour time of day periods. Experiences thus far have pointed to major benefits of using detailed land use variables and urban design variables, but also to new challenges in providing parcel-level land use inputs for future years

Analysis and use of VAS satellite data

A series of interrelated investigations has examined the analysis and use of VAS (VISSR Atmospheric Sounder) satellite data. A case study of VAS-derived mesoscale stability parameters suggested that they would have been a useful supplement to conventional data in the forecasting of thunderstorms on the day of interest. However, the meteorological significance of small or short lived stability features was uncertain. A second investigation examined the roles of first guess and VAS radiometric data in producing sounding retrievals. The radiance data often did not have a decisive influence on the final satellite soundings. Broad-scale patterns of the first guess, radiances, and retrievals frequently were similar, whereas small scale retrieval features, especially in the dew points, were often of uncertain origin

Recent Decisions

Comments on recent decisions by L. D. Wichmann, Lawrence James Bradley, John F. Beggan, John A. Slevin, Robert P. Mone, and F. James Kane