نتایج جستجو برای: a simulation

تعداد نتایج: 13518778  

ژورنال: Journal of Railway Research 2014
Yalçınkaya*, Özgür,

One of the important problems in management of railway systems is train scheduling problem. This is the problem of determining a timetable for a set of trains that do not violate infrastructure capacities and satisfies some operational constraints. In this study, a feasible timetable generator framework for stochastic simulation modeling is developed. The objective is to obtain a feasible tr...

Journal: :فیزیک زمین و فضا 0
عباسعلی علی اکبری بیدختی استاد، گروه فیزیک فضا، مؤسسة ژئوفیزیک دانشگاه تهران سرمد قادر دانشیار، گروه فیزیک فضا، مؤسسة ژئوفیزیک دانشگاه تهران معصومه شاهسواری دانش آموخته کارشناسی ارشد، گروه فیزیک فضا، مؤسسة ژئوفیزیک دانشگاه تهران

geophysical fluids such as atmosphere and ocean often have stable density stratification; hence internal gravity waves are generated and propagated through them which are important in momentum and energy transfer in these media. these waves are also believed to generate layered structures in such media. recently there have been numerous theoretical, experimental and numerical studies on the way...

Journal: :علوم و تحقیقات هوافضا 0
فرشاد پازوکی دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، دانشکده مهندسی مکانیک و هوافضا علیرضا باصحبت نوین زاده دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، دانشکده مهندسی مکانیک و هوافضا امیر لبیبیان دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، دانشکده مهندسی مکانیک و هوافضا

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Journal: :iranian journal of hydrogen & fuel cell 2015
mohammad alijanpour majid shateri mojtaba aghajani delavar mousa farhadi

in this research the simulation of an air independent proton exchange membrane fuel cell (pemfc) propulsion system was taken into consideration. the system consists of several parts including pem fuel cell stack, metal hydride and liquid oxygen (lox) tanks, and also pre-heaters of oxygen and hydrogen gases along with other heat exchangers, to ensure proper operation of system. the heat recovery...

Journal: :international journal of energy and environmental engineering 2010
k javaherdeh h karimi

this study represents effect of four variables in performance of a heat-pump in two cities of tehran and rasht. a computer program has been developed, simulating a certain heat pump acting in different environments with different refrigerants in heating season. the analysis is based on a homogeneous model. effect of different refrigerants, depth of the buried heat exchangers and moisture conten...

Journal: :نشریه علمی - پژوهشی هیدرولوژی کاربردی 0
mohammad moazami sadat feiznia majid kholghi arash malekian

abstract the coupled modflow-hydrus software package was used to produce a saturated-unsaturated flow model for a flood spreading system (fss) and its associated aquifer. the study aim to improve simulations of near-surface hydrological processes, including temporal and spatial variation in groundwater recharge rates. the coupled model was built with average rmse=1.1 and 1.3 for calibration and...

Journal: :journal of petroleum science and technology 2014
javad - ivakpour norolah kasiri

the simulation of distillation columns is an essential step in design, optimization, and rating. in this paper, a new procedure has been proposed for the initial estimation of column profiles based on modified kremser’s group method for simple and/or complex columns. the effect of this initialization algorithm on simulation procedure has been studied through two examples. the results show signi...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2012
pejman ganjeh-anzabi vahid hadadi-asl mehd salami-kaljahi hossein roghani-mamaqani

in this work, based on experimental observations and exact theoretical predictions, the kinetic scheme of raft polymerization is extended to a wider range of reactions such as irreversible intermediate radical terminations and reversible transfer reactions. the reactions which have been labeled as kinetic scheme are the more probable existing reactions as the theoretical point of view. the deta...

Journal: :international journal of automotive engineering 0
b. sakhaei m. durali

by new advancements in vehicle manufacturing vehicle quality evaluation and assurance has become a more critical issue. in present work, the vibration transfer path analysis and vibration path ranking of a car interior has been performed. the method is similar to classical multilevel tpa methods but has distinct differences. the method is named vivs which stands for vehicle interior vibration s...

Journal: :روش های عددی در مهندسی (استقلال) 0
محمد اقدسی m. aghdasi فریماه مخاطب رفیعی و قاسم مصلحی f. mokhatab rafiei and g. moslehi

this paper presents a summary of the results from the simulation of a given two-stages production system which uses jit. the system consists of an assembly line with two automated assembly cells and two assembly stock points and one manufacturing cell with three manufacturing stock points for storing reserved parts and one receiving stock. carts with fixed capacity are used for handling the par...

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