نتایج جستجو برای: coefficient of efficiency

تعداد نتایج: 21187501  

Journal: :physical chemistry and electrochemistry 0

in this study, a temperature-dependent of the dispersion coefficients is calculated from equation state.the lennard-jones lj (12-6-3) effective pair potential function and simple thermodynamic argumentwith the input pvt data of liquid metals are used to calculate the dispersion coefficients. the dispersioncoefficients ( , , ) 3 6 12 c c c are found to be a linear function of 1/t1+α , where t is...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2013
Fangxu Jing Silas Alben

We analyze two- and three-link planar snakelike locomotion and optimize the motion for efficiency. The locomoting system consists of two or three identical inextensible links connected via hinge joints, and the angles between the links are actuated as prescribed periodic functions of time. An essential feature of snake locomotion is frictional anisotropy: The forward, backward, and transverse c...

Journal: :اکو هیدرولوژی 0
حسین سلمانی دانشجوی دکتری آبخیزداری، دانشگاه علوم کشاورزی و منابع طبیعی گرگان عبدالرضا بهره مند دانشیار دانشگاه علوم کشاورزی و منابع طبیعی گرگان کاظم صابرچناری دانشجوی دکتری آبخیزداری، دانشگاه علوم کشاورزی و منابع طبیعی گرگان محمد رستمی خلج دانشجوی دکتری آبخیزداری، دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج

according to variety of accessible hydrological models, evaluateing the efficiency of models for different management objectives are essential. therefore, models with simple structure and using minimal input that can provide an acceptable result can serve as an effective tool to watershed managers. hence, the objective of this research is to evaluate the relative performances of the lumped conc...

Journal: :چغندرقند 0
حمید زارع ابیانه دانشیار مهندسی آب، دانشگاه بوعلی سینا همدان

to determine sugar beet water requirement and the effect of changing the quantity of applied water on some production components, a study was carried out in ekbatan agricultural research station of hamedān, iran in four years (1994-1997) during which optimum water requirement, root and sugar yield, water use efficiency on the basis of root yield, sugar percentage and water use efficiency on the...

Journal: :jundishapur journal of health sciences 0
mansooreh dehghani department of environmental health, research center for health sciences, school of health, shiraz university of medical sciences, shiraz, ir iran; mansooreh dehghani, department of environmental health, research center for health sciences, school of health, shiraz university of medical sciences, shiraz, ir iran. tel: +98-9164490350, fax: +98-7137260225 mehdi hoseini department of environmental health engineering, student research committee, school of health, shiraz university of medical sciences, shiraz, ir iran mohammad-kazem fathi fath-aabaadi department of environmental health engineering, student research committee, school of health, shiraz university of medical sciences, shiraz, ir iran zahra elhamiyan department of environmental health engineering, student research committee, school of health, shiraz university of medical sciences, shiraz, ir iran narges shamsedini department of environmental health engineering, student research committee, school of health, shiraz university of medical sciences, shiraz, ir iran masoud ghanbarian department of environmental health engineering, school of health, shiraz university of medical sciences, shiraz, ir iran

conclusions in conclusion, the electrocoagulation process can be used for removing nitrate from water resources because of high efficiency, simplicity, and relatively low cost. results results of the present study showed that the removal efficiency was increased from 27% to 86% as ph increased from 3 to 11 at the optimal condition of 30 v and 75 min operation time. moreover, by increasing the r...

Journal: :journal of industrial engineering, international 2010
a hatami-marbini saber saati a makui

in this paper, by introducing two virtual decision-making units (dmus) called ideal dmu (idmu) and anti-ideal dmu (admu) with fuzzy inputs-outputs, the efficiency evaluation of dmus are done by fuzzy data envelopment analysis (fdea). therefore, we evaluate dmus from the perspective of the best and worst possible relative efficiency. for each dmu two efficiencies are calculated while inputs and ...

Journal: :Computers & Mathematics with Applications 2006
Marta Z. Kwiatkowska Gethin Norman António Pacheco

Abstract—In this paper we extend CSL (Continuous Stochastic Logic) with an expected time and an expected reward operator, both of which are parameterized by a random terminal time. With the help of such operators we can state for example that the expected sojourn time in a set of goal states within some generally distributed delay is at most (at least) some time threshold. In addition, certain ...

2015
Joachim Piprek Bernd Witzigmann

III-nitride light-emitting diodes (LEDs) suffer from a severe efficiency reduction with increasing injection current (droop). Auger recombination is often seen as primary cause of this droop phenomenon. The corresponding Auger recombination coefficient C is typically obtained from efficiency measurements using mathematical models. However, C coefficients reported for InGaN active layers vary ov...

In thermoelectric coolers (TECs) applied external voltage potential is generated to a temperature difference based on the Peltier effect. Main and basic structure of TECs is in the form of single stage device. Due to the low efficiency, especially low coefficient of performance (COP) of thermoelectric coolers, optimal design of geometrical parameters of such devices is vital. For this purpose, ...

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