نتایج جستجو برای: such as lightning

تعداد نتایج: 5966108  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - پژوهشکده فنی و مهندسی 1388

asymmetric polyethersulfone (pes) microfiltration flat sheet membranes were composed by the phase inversion method (pim) and were used as supports. composite membranes were fabricated by coating silicone rubber as selective layer. effect of different concentrations of pes and pdms and different solvent such as nmp, dmf and dms effects as pes solvents and support thickness and different coagulat...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه مازندران - دانشکده علوم انسانی و اجتماعی 1392

tourism , today as one of the ways to make money, create jobs , and social and political interactions is considered. this paper aims to examine the strengths and weaknesses of tourism development in mahmoud abad ( mazandaran ). the research method in this study is " descriptive - analytical " and to collection of data used field methods such as questionnaires and documentation - library. the sa...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد مرودشت - دانشکده علوم تربیتی و روانشناسی 1392

the purpose of this study was to investigate the relationship between family functioning and marital adjustment humor couples are due to the nature and objectives of the research and application of methods for its implementation correlation was used. the study population consisted of all the couples in the city who uses random cluster sampling of 200 students were selected as sample. data from ...

2011
Ebrahim A. Badran Mohammad E. M. Rizk Mansour H. Abdel-Rahman

The rapid expansion of wind power generation has brought problems involving lightning strikes to the fore. Many such incidents have damaged not only the wind turbine that was actually struck, but also other turbines that were not. The phenomenon of surge invasion to the distribution line is categorized as “back-flow surge”. It has been reported that this back-flow surge sometimes burns out surg...

Journal: :Ying yong sheng tai xue bao = The journal of applied ecology 2013
Ji-Li Zhang Wu Bi Xiao-Hong Wang Zi-Bo Wang Di-Fei Li

Lightning-caused fire is the most important natural fire source. Its induced forest fire brings enormous losses to human beings and ecological environment. Many countries have paid great attention to the prediction of lightning-caused fire. From the viewpoint of the main factors affecting the formation of lightning-caused fire, this paper emphatically analyzed the effects and action mechanisms ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید چمران اهواز - دانشکده ادبیات و علوم انسانی 1389

this study purported to compare and contrast the use of self-mention and evidentials as two mtadiscourse features in opinion columns of persian and english newspapers. the theoretical basis of this study is the idea that metadiscourse features vary across cultural boundaries. for this purpose, 150 persian and 150 english opinion columns were collected based on three factors of topic, audience a...

2003
Y. Kuleshov

Lightning, one of the most powerful forces in nature, once was mysterious, magical and feared as the great weapon of the Gods. Ancient Greeks feared lightning as it was believed to be hurled by Zeus, the king of the Gods. For the Vikings, lightning was produced by Thor as his hammer struck an anvil while riding his chariot across the sky. American Indians believed that lightning was caused by b...

1999
Gerhard Diendorfer Wolfgang Schulz V. A. Rakov

In this paper, we compare various lightning characteristics measured by the Austrian lightning locating system [Austrian Lightning Detection and Information System (ALDIS)] with those found in the literature. The latter are typically based on measurements of lightning electric fields. We show that lightning peak electric fields due to subsequent strokes measured by the ALDIS are similar to thos...

2009
Arthur Tu David Danks

Introduction: The Puzzle Consider the following scenario: on a stormy night, a tree was struck by lightning, caught fire and burned down. What caused the tree to burn down? Even though both the lightning strike and the presence of oxygen were required and sufficient for combustion, we usually say the lightning strike is " the cause " of the fire and the presence of oxygen is merely a background...

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