Video recordings are used to quantitatively analyze pitchers' techniques. However, reliability and validity of such analysis is unknown. The purpose of the study was to investigate the reliability and validity of joint and segment angles identified during a pitching motion using video analysis. Thirty high school baseball pitchers participated. The pitching motion was captured using 2 high-speed video cameras and a motion capture system. Two raters reviewed the videos to digitize the body segments to calculate 2-dimensional angles. The corresponding 3-dimensional angles were calculated from the motion capture data. Intrarater reliability, interrater reliability, and validity of the 2-dimensional angles were determined. The intrarater and interrater reliability of the 2-dimensional angles were high for most variables. The trunk contralateral flexion at maximum external rotation was the only variable with high validity. Trunk contralateral flexion at ball release, trunk forward flexion at foot contact and ball release, shoulder elevation angle at foot contact, and maximum shoulder external rotation had moderate validity. Two-dimensional angles at the shoulder, elbow, and trunk could be measured with high reliability. However, the angles are not necessarily anatomically correct, and thus use of quantitative video analysis should be limited to angles that can be measured with good validity.
Dispersion relations and polarizations for surface waves in infinite planar
samples in the QHE regime are explicitly determined in the small wavevector
limit in which the dielectric tensor can be considered as local. The wavelength
and frequency regions of applicability of the results extends to the infrared
region for typical experimental conditions. Then, standard samples with
millimetric sizes seem to be able to support such excitations. Forced
oscillations are also determined which should be generated in the 2DEG by
external electromagnetic sources. They show an almost frequency independent
wavevelength which decreases with the magnetic field. A qualitative model based
in these solutions is also presented to describe a recently found new class of
resonances appearing near the edge of a 2DEG in the QHE regime.Comment: latex file, 18 pages, 3 figures, spelling correcte
Graphical Abstract
Summary:
Transfer of passive immunity (TPI) at d 1 of life was categorized based on serum immunoglobulin G (IgG-Poor: IgG <18 g/L; IgG-Good: IgG 18 to <25 g/L; IgG-Excellent: IgG ≥25 g/L) and total protein concentrations (TP-Poor: <5.8 g/dL; TP-Good: 5.8 to <6.2 g/dL; TP-Excellent: ≥6.2 g/dL) for a total of 35 calves housed at a commercial raising operation. Overall, serum IgG (determined with radial immunodiffusion) and total protein (determined with refractometry) concentrations decreased during the first 16 d of life; however, the dynamics during these days varied based on TPI classification at d 1 of life.
Este artigo é constitutivo de reflexões teórico-metodológicas, apresentadas no projeto de mestrado na UFRJ. Está articulado em dois momentos, tendo por objetivo, trazer elementos acerca da centralidade da questão racial enquanto chave analítica, estrutural e estruturante do capitalismo e dinamizador da “questão social” na particularidade da formação econômica-social do Brasil, e as determinações para pensar o serviço social nesta trama; tomando como mediação os acúmulos da categoria profissional e as Diretrizes Curriculares da ABEPSS (1996), resgatando a perspectiva da totalidade social para análise dos núcleos de fundamentação, a estrutura e lógica curricular. As conclusões, longe de se esgotarem, nos mostram que a atual quadra histórica carrega avanços significativos para pensarmos a produção do conhecimento acerca da matéria e a centralidade da luta antirracista na afirmação do projeto ético-político, ainda que incorra atravessamentos e dilemas a serem postos na agenda do dia.
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