نتایج جستجو برای: دمپر mr
تعداد نتایج: 65022 فیلتر نتایج به سال:
پیاده سازی تئوری تغییرشکل های یکنواخت در کنترل نیمه فعال سازه ها با استفاد ه از کنترل کننده های فازی
در این مطالعه هدف پیاده سازی یک سیستم کنترلی فازی بر مبنای تئوری تغییرشکل های یکنواخت برای کنترل نیمه فعال سازه های مجهز به میراگر با استفاده از الگوریتم بهینه یابی pso تحت بارهای لرزه ای است. در این پژوهش کارایی ایده ی یکنواخت کردن دریفت ها در کاهش پاسخ های لرزه ای سازه مورد بررسی قرار گرفته است. برای بررسی توانمندی استراتژی پیشنهادی برای سازه های مختلف و ارتعاشات لرزه ای متفاوت، شبیه سازی عدد...
background access to appropriate images of fetal brain can greatly assist to diagnose of probable abnormalities. the aim of this study was to compare the suitability of t2-true fast imaging with steady state free precession (t2-trufi), and t2-half-fourier acquisition single-shot turbo spin-echo (t2- haste( magnetic resonance imaging (mri) to extract the fetal brain using the level set algorithm...
magnetorheological (mr) dampers have the advantage of being tuned by low voltages. this has attracted many researchers to develop semi-active control of structures in theory and practice. most of the control strategies first obtain the desired forces of dampers without taking their dynamics into consideration and then determine the input voltages according to those forces. as a result, these st...
australian rainfall is related with numerous key climate predictors namely el-nino southern oscillation (enso), indian ocean dipole (iod) and southern annular mode (sam). some studies have tried to discover the effects of these climate predictors on rainfall variability of different parts of australia, particularly western australia, queensland and victoria. nonetheless, clear association betwe...
با توجه به کاربردهای روزافزونی که کدهای ترکیبی به خصوص کدهای ضربی در سامانه های مخابرات بی سیم نظامی و ارتباطی دارند، توانایی شناسایی کور این کدها در سامانه های جنگ الکترونیک یکی از نیازهای دانش بنیان است. تاکنون روش های مختلفی برای شناسایی کدهای تشخیص خطای کانال ارائه گردیده است، اما در زمینه شناسایی کور کدهای ضربی هیچ روشی معرفی نشده است. در این مقاله با معرفی کدهای ضربی دوبعدی، تلاش نموده ای...
objectives: the main purpose of this study is to produce an instrument for handwriting evaluation and to execute it on mentally retarded (mr) students. methods: this was a descriptive, cross-sectional, and relationship study. 126 mr students (53 girls and 73 boys) ranging from 9 to 19 years old (13.23±2.17) from two exceptional children schools in shahr-e-rey participated in this study. a handw...
Background: The magnetic resonance imaging (MRI)-based radiotherapy planning method have been considered in recent years because of the advantages of MRI and the problems of planning with two images modality. The first step in MRI-based radiotherapy is to evaluate magnetic resonance (MR) images geometric distortion. Therefore, the present study aimed to evaluate system related geometric distort...
background: this study was undertaken to compare the outcome in patients with moderate to severe ischemic mitral regurgitation (imr) undergoing coronary artery bypass grafting (cabg) with either mitral valve repair or mitral valve replacement. methods: between march 2002 and february 2005, 49 consecutive patients (mean age: 62.84±8.42 years; mean euroscore: 10.03±3.12) with coronary artery dise...
Introduction: Hamstring and patellar ligaments are the most common ligaments that used in arthroscopic anterior cruciate ligament reconstruction (ACLR). Preoperative knowledge about the diameter of the graft can be so useful for the surgeons. In the current study, the efficacy of measuring the graft diameter using MR imaging was investigated. Methods: In the present study 50 patients with ACL ...
The effect of intelligent semi-active thermal exchange-fuzzy controller in structural rehabilitation by attenuating seismic responses of structural systems is investigated. In the suggested control system, MR dampers and sensors are employed as a semi-active controller. Resultant control forces of MR damper are administrated by providing external voltage supply, during the earthquakes and high ...
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