نتایج جستجو برای: Physical Model
تعداد نتایج: 2649977 فیلتر نتایج به سال:
a semi-empirical mathematical model for predicting physical part of ignition delay period in the combustion of direct - injection diesel engines with swirl is developed . this model based on a single droplet evaporation model . the governing equations , namely , equations of droplet motion , heat and mass transfer were solved simultaneously using a rung-kutta step by step unmerical method . the...
run-out-table (rot) is located between last finishing stand and down coiler in a hot strip mill. as the hot steel strip passes from rot, water jets impact on it from top and bottom and strip temperature decreases approximately from 800-950 °c to 500-750°c. the temperature history that strip experience while passing through rot affects significantly the metallurgical and mechanical properties, s...
for non-darcy flow in submerged porous media a one- dimensional mathematical model has been developed. rockfill detention dams are one of these porous media that comprised of relatively homogenous coarse rockfill which can be used to reduce flood discharge and hydrograph peak. in this research the focus was on the rockfill detention dams in submerged condition. the existence of overtopping rock...
background: obesity is a major problem in both developed and underdeveloped countries. the aim of this study is to investigate the effects of a physical education program (pep) on promoting health belief model (hbm) scores, increasing physical activity (pa), and reducing obesity among iranian high school students. methods: this quasi‑experimental study was accomplished at four high schools that...
background: educational interventions to promote physical activity are one of the health priorities. a theoretical approach to promote and maintain physical activity is the transtheoretical model (ttm). this research was conducted to determine the effects of this model on students' physical activity habits in 2011. methods: this quasi-experimental study was conducted on 200 students in two grou...
background : lack of physical activity is the fourth common cause of human death. given the increased rate of sedentary life style among employees, the aim of this study was to evaluate physical activity status of governmental employees in changing stage based on the transtheoretical model (ttm) in hamadan, iran, in 2014. methods: this descriptive-analytical study was performed on 1200 governme...
background: regular physical activity (pa) has positive effects on physical, psychological and social health in the individual and the community. reduced pa is a major global problem that is increasing in prevalence every day. the present study aimed to determine the status of pa among adolescent girls and their perceptions of obesity prevention. materials and methods: the present descriptive-a...
background: promoting physical activity is one of the most effective strategies for reducing the risk of some chronic and non-communicable diseases. one of the theoretical approaches to the promotion of physical activity is the transtheoretical model. the aim of this study was to determine the effect of transtheoretical model-based education on promoting physical activity among employees of abu...
abstract part one: the electrode oxidation potentials of a series of eighteen n-hydroxy compounds in aqueous solution were calculated based on a proper thermodynamic cycle. the dft method at the level of b3lyp-6-31g(d,p) was used to calculate the gas-phase free energy differences ,and the polarizable continuum model (pcm) was applied to describe the solvent and its interaction with n-hydroxy ...
abstract background: beginning and continuing pregnancy with obesity and being overweight has some known side effects for the mother and the fetus. preventing these complications requires medical interventions before pregnancy. because designing health improvement interventions requires understanding of the related factors of the behavior, the aim of this study was to determine the relation bet...
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