نتایج جستجو برای: loss length
تعداد نتایج: 738341 فیلتر نتایج به سال:
OBJECTIVE Investigate the effects of 12 months of dietary weight loss and/or aerobic exercise on leukocyte telomere length in postmenopausal women. DESIGN AND METHODS Four hundred and thirty nine overweight or obese women (50-75 years) were randomized to: (i) dietary weight loss (N = 118); (ii) aerobic exercise (N = 117), (iii) diet + exercise (N = 117), or (iv) control (N = 87). The diet int...
In this study, thermal performance of the collector with analytic and quasi-dynamic method is evaluated based on energy balance equations for each part of the U-pipe evacuated tube solar collector. Using this approach, effect of different parameters such as tube size, overall heat loss coefficient, absorber tube absorptivity, mass flow rate and air layer thermal resistance on thermal performanc...
Irrigation channels, which are parts of rainwater catchment systems, have been used for water supply in agriculture for a long time. Seepage loss in irrigation channels is one of the farmers' concerns. Seepage loss, especially in earthen channels, can be noticeable. Different equations have been developed to estimate seepage loss amount in irrigation channels. However, the accuracy of the equat...
We investigate loss mechanisms in 1.55m InGaAsP–InP multiquantum-well ridge-waveguide laser diodes at room temperature. The common method of measuring light versus current curves and plotting the inverse slope efficiency versus laser length is employed to extract the internal optical loss i and the differential internal efficiency i. This method neglects the dependence of both the parameters on...
To maintain a high system-uniformity and also acceptable water use efficiency in a solid-set sprinkler irrigation system, the total committed pressure variation to subunits should not exceed 20% of the pressure head of the sprinkler which operates with the average pressure. Although some references often recommend giving the major part of this pressure variation to laterals, a scientific and pr...
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We investigate the radiative collision rate in an ultracold, optically trapped cesium gas near a magnetically tunable Feshbach resonance. The radiative trap loss is suppressed by a factor of up to 15 when the node of the ground state pair correlation function is tuned to the Condon point. This constitutes a direct measurement of both the sign and the magnitude of the s-wave scattering length. I...
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