نتایج جستجو برای: wave effect

تعداد نتایج: 1833471  

Journal: مهندسی دریا 2005
Ali Nakhaee, Aliasghar Golshani, Majid Jandaghi Alaee, Soheila Taebi, Vahid Chegini,

The significant effect of waves on coastal and marine activities urges the precise identification of wave characteristics using field measurements, theoretical studies, physical modeling or numerical simulations. In order to study thoroughly the wave climate in the Caspian Sea, a wave modeling and hindcast project was performed by Iranian National Center for Oceanography. In this study, one of ...

احمد درودی, , محمدتقی توسلی, ,

  Optical interferometry is being used as an efficient tool to analyse smooth surfaces for more than a century. Although, due to introduction of novel computer assisted analyzing techniques and array detectors, like CCD, the speed and the precision of processing have been increased tremendously, but the main equation involved is not changed. The main equation is the intensity distribution in th...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علم و صنعت ایران - دانشکده مهندسی برق 1386

در این پایان نامه سعی کرده ایم برای یک سری از ساختارهای خطوط انتقالی که عموما با روش های عددی یا با استفاده از نرم افزارهای full wave حل می شوند، مدلی ساده و در عین حال دقیق ارایه دهیم که می تواند رفتار مدل فیزیکی را از دید پایانه ها به خوبی پیش بینی کند. این ساختار خطوط انتقال میکرواستریپی می شوندکه در بردهای pcb چند لایه به صورت عمود بر هم قرار می گیرند. خطوط مایکرواستریپ عمود برهم به دلیل ...

Journal: :رادار 0
سمانه پاک نیت حبیب اله عبیری هومن بهمن سلطانی

in this paper, the operation of helix traveling wave tube in interaction region is investigated by using a three dimensional large signal lagrangian model in frequency domain. the complete simulation of these tubes is essential for optimum design and minimum manufacturing cost. this 3d code can compute interception current (or current losses ), beam radius changes in interaction region and the ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه - دانشکده علوم 1391

گرافن ابررسانای طبیعی نیست اما افرادی بودند که لایه های ابررسانایی بوسیله لایه نشانی یک ابررسانا برروی یک لایه گرافن بر پایه گرافن تولید کرده اند ، به طوری که علاوه بر جفت شدگی معمول s-wave دیگر جفت شدگی های غیر معمول نیز با روش مجاورت یک ابرسانای غیر معمول نظیر ابررساناهای دما بالا قابل دسترسی خواهد بود. در نتیجه توجهات خاصی به تاثیر جفت شدگی های غیر معمول در انتقالات کوانتومی در اتصالات ابر ر...

In this paper we have studied the effect of magneto-static field onpropagation of thermal wave generated in metal by pulsed laser. In fact this interactiongenerate acoustic wave in different mechanisms. However, always the commonmechanism in the interactions of laser pulse and metal is the thermo-elastic wavegeneration. Applying the suitable magneto-static field on the s...

راشدی, غلامرضا,

In this paper, a dc Josephson junction between two singlet superconductors (d-wave and s-wave) with arbitrary reflection coefficient has been investigated theoretically. For the case of high Tc superconductors, the c-axes are parallel to an interface with finite transparency and their ab-planes have a mis-orientation. The physics of potential barrier will be demonstrated by a transparency coeff...

Abdolrasoul Gharaati Nasrin Miri Zahra Zareian

In this paper, we study two different Graded Index (GRIN) photonic crystal (PC) structures which are named as structure type I and type II. The PC structures are made of the square rod in an air background. To design a GRIN PC structure the lattice constant has been altered in the direction transverse to propagation. We investigated focusing effect             and waveguiding behavior of electr...

Journal: :auditory and vestibular research 0
tahereh esmaeilnia breast feeding research center, vali-e-asr hospital, tehran university of medical sciences, tehran, iran mamak shariat maternal fetal and neonatal research center, vali-e-asr hospital, tehran university of medical sciences, tehran, iran bita ebrahim maternal fetal and neonatal research center, vali-e-asr hospital, tehran university of medical sciences, tehran, iran faezeh moghimpour bijani school of medicine, tehran university of medical sciences, tehran, iran

background and aim: neonatal jaundice is one of the common causes of early sensori­neural hearing loss and an important cause of deafness in children. auditory responses are the most sensitive parts of the nervous system to the toxic effect of bilirubin. this study was aimed to examine the effect of neonatal hyperbili­rubinemia and its treatment on auditory brain­stem responses (abr). methods: ...

ژورنال: مهندسی دریا 2011
اسکافی, مجید , لاری, کامران , مروتی, حسین ,

In this study two breakwater models with different conditions of bed, waves and water level are employed to analyze the toe stability and scour depth. The tests are conducted with regular waves. It is found that the scour depth in front of the rubble-mound breakwater depends on wave height, structure slope, water level and wave period, but the results reveal the effect of wave period toe is mor...

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