evaporative cooling system and high air velocity management are important tools in alleviating the effects of heat stress on broilers performance during hot weather. in this study, technical and economical aspects of ventilation in varamin township broiler farms during summer were investigated. data were obtained from completed questionnaires through 20 broiler houses. information of air veloci...

The purposes of this study were to examine age and gender differences in knee extensor strength, power, and fatigue using open- and closed-chain testing procedures. We tested the hypothesis that specific strength (strength/unit muscle mass) would not differ by age, whereas age differences in specific power and fatigue would remain consequent to blunted maximal contractile velocity. Skeletal mus...

A high-resolution upper-ocean survey of a cyclonic jet meander and an adjacent cyclonic eddy in the California Current region near 388N, 1268W was conducted as part of the summer of 1993 Eastern Boundary Currents program. Temperature and salinity were measured from a SeaSoar vehicle, and velocity was measured by shipboard acoustic Doppler current profiler (ADCP). SeaSoar data show a density fro...

[Purpose] The aim of this study was to identify how to effectively use elastic stockings. [Subjects and Methods] Ten young healthy men participated in this study. Time-averaged maximum flow velocity in the common femoral vein was measured for 20 seconds using a pulse Doppler method with a diagnostic ultrasound system under six conditions (three different positions and with and without stockings...

The purpose of this study was to determine the kinematic variables that identify the quality of velocity in soccer players at different competitive levels and playing positions. This study had two independent variables: 1) a competitive level (competitive and non-competitive players); and 2) a playing position, with four levels (central defenders, wide defenders/midfielders, central midfielders...

Force-velocity relationships reported in the literature for functional tasks involving a combination of joint rotations tend to be quasi-linear. The purpose of this study was to explain why they are not hyperbolic, like Hill's relationship. For this purpose, a leg press task was simulated with a musculoskeletal model of the human leg, which had stimulation of knee extensor muscles as only indep...

Objective: To evaluate the screening efficiency of ultrasound and Doppler measurements in the prediction of fetal anemia in alloimmunized pregnancies. Materials and Method: In a prospective study, 24 nonhydropic fetuses with red blood cell alloimmunization were evaluated with ultrasound and Doppler imaging. Middle cerebral artery peak systolic velocity, intrahepatic umbilical venous maximum vel...

1. The relationship between force and velocity of shortening and between power and velocity were examined for myotomal muscle fibre bundles from the dogfish. 2. The maximum velocity of shortening, mean value 4-8 ± 0-2 (ms" 1 half sarcomere" (±S.E.M., N = 13), was determined by the 'slack step' method (Edman, 1979) and was found to be independent of fish length. 3. The force-velocity relationshi...

AIMS To use microstructural computer models to study how four features of myocardial architecture affect propagation: brick wall tissue structures, jutting at cell ends, gap junction distribution and conductance along cell borders, and increased structural discontinuity. METHODS AND RESULTS Simulations of longitudinal and transverse plane wave propagation and point propagation were performed ...