نتایج جستجو برای: peak pond level return period modeling factor

تعداد نتایج: 2713864  

2011
J. Howard M. A. Uman C. Biagi D. Hill V. A. Rakov D. M. Jordan

[1] We characterize the measured electric field–derivative (dE/dt) waveforms of lightning stepped‐leader steps from three negative lightning flashes at distances of tens to hundreds of meters. Electromagnetic signatures of leader steps at such close distances have rarely been documented in previous literature. Individual leader‐step three‐dimensional locations are determined by a dE/dt TOA syst...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید چمران اهواز - دانشکده ادبیات و علوم انسانی 1394

adaptation of the lord of the rings is considered by many to be among the greatest, most successful and at the same time most popular of the above mentioned trend so far. it is my intention to look at the success and popularity of this epic fantasy in the light of the 9/11 attacks and the war on terror context of g. w. bush’s aura. in so doing i aim at bringing into the light the determining fa...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی 1389

this study was an attempt to investigate the effect of using c-test passages on the reading comprehension and incidental vocabulary learning of iranian intermediate efl learners. the participants were 60 male efl learners at kish mehr institute in garmsar. in fact, there were two groups, an experimental group and a comparison group with 30 students in each. the participants were pretested throu...

Journal: :Journal of Geotechnical and Geoenvironmental Engineering 2007

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز 0

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...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2005
amir hossein shamekhi ali ghaffari

the application of ion current signals is one of the most recent approaches in engine management systems. by applying a small constant dc voltage across the electrodes of the spark plug and measuring the current through the electrode gap, the state of gas may be measured and investigated. in this paper a computer code is developed in order to analyze the state of gas during the combustion perio...

2012
Michael A. Haddad Vladimir A. Rakov Steven A. Cummer

[1] We analyzed wideband electric field waveforms of 265 first and 349 subsequent return strokes in negative natural lightning. The distances ranged from 10 to 330 km. Evolution of firstand subsequent-stroke field waveforms as a function of distance is examined. Statistics on the following field waveform parameters are given: initial electric field peak, opposite-polarity overshoot, ratio of th...

A.K.M.R. Amin, M. Shahjahan, M.I. Hossain, M.S. Rahman, S.I. Ahmed,

Sumithion is an organophosphorous pesticide widely used to control tiger bugs in fish larval rearing pond. The present study was aimed to investigate the effects of sumithion on plankton population abundance in aquaculture pond. The experiment was carried out with three treatments, i.e. ponds with no sumithion (T1), ponds with 1.0 ppm sumithion (T2) and those with 2.0 ppm sumithion (T3). The wa...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی 1389

after the soviet union dissolution, a chaotic period was begun in the russia. russia lost its glory and felt disgrace. the first group of elites came to power under yeltsin; they tried to re-define russia’s identity as a european country and build a foreign policy on this baseline. therefore russia tried to become closer with the west especially with the u.s. according to their view the sovie...

Sukuk is the most important Islamic financial securities designed based on Islamic laws, and the relationship between risk and return is the most basic concept in Islamic finance. The results of examining and comparing the similarities between bonds and sukuk show that the most important difference between these two financing tools is the type of asset backed by sukuk and the type of asset cont...

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