نتایج جستجو برای: روشman ray
تعداد نتایج: 302977 فیلتر نتایج به سال:
this study reports the simple process to synthesis of cuo/cui nanocomposite in a non-aqueous solution. in the conducted experiments cui and dimethyl sulfoxide (dmso) were used as the precursors. moreover, dmso had role of solvent and ligand simultaneously. in experiments the effects of oleic acid as the particles size modifier, temperature and concentration were investigated. crystalline struct...
introduction: the image quality as well as film speed is influenced by the film processing conditions. different combinations of films and processing methods affect the diagnostic accu-racy. temperature and developer exhaustion result in different image quality. the purpose of this study was to evaluate the influence of film type and processing conditions on caries detec-tion. material and met...
background: seaweeds contain significant quantities of lipids, protein, vitamins and minerals. aquavac ergosan contains 1% alginic acid extracted from two brown seaweeds, laminaria digitata and ascophyllum nodosum. both in vivo and in-vitro researches have mainly been focused on the effect of ergosan on fish growth, survival rate, reproductive performance and innate immunity in blood and epider...
abstract background: the radiographic image accuracy depends on the x-ray film information visibility. good visibility is found by good contrast. radiation exposure parameters (kvp, mas) and film processing conditions have impact on contrast. in dentistry radiography machines, exposure time and processing procedure are set by radiographer. no optimized exposure time and processing conditions ma...
conclusions performing the routine chest ct in high-energy blunt trauma patients (with a mean injury severity of 9), although leading to the diagnosis of some occult injuries, has no impact on the outcome and does not decrease the in-hospital stay and icu admission time. it seems that performing the routine chest ct in these patients may lead to overtreatment of nonsignificant injuries. the dec...
in this paper a novel fuzzy scheme for medical x-ray image classification is presented. in this method, any image is partitioned in to 25 overlapping subimages and then shape-texture features are extracted from shape and directional information extracted from any subimage. in the classification stage, we apply a fuzzy membership to any subimage with respect to euclidean distance between feature...
پارامتر rms پراکندگی تاخر یکی از پارامترهای مهم در طراحی سیستمهای مخابرات سیار می باشد. در این پایان نامه خصوصیات rms پراکندگی تاخیر در محیط تونل بررسی شده است . منحنیهای طیف توان تاخیری که برای محاسبه rms پراکندگی تاخیر در مکانهای مختلف مورد نیاز می باشند توسط شبیه سازی انتشار امواج داخل تونل با روش ray tracing محاسبه شده اند. مبنای روش ray tracing یافتن همه مسیرهای انتشاری بین فرستنده و گیرند...
کپسیتابین، با نام شیمیایی n4-پنتیل اکسی کربونیل 5-دی اکسی 5-فلورور سیتیدین، یک فلورورپیریمیدین غیر سمی است که به عنوان پیش-دارو 5-فلوروراوراسیل برای درمان برخی از سرطان¬های پیشرفته به صورت خوراکی استفاده می¬شود. ساختار کریستـالی کاپسیتابین به طور تجربی از پراش x-ray بدست آمده است. از آنجایی که پراش x-ray موقعیت دقیق اتم¬های هیدروژن را نشان نمی¬دهد، بنابراین بهینه سازی مختصات اتم¬های هیدروژن در...
background: the purpose of this study was to find the accurate absorbed dose in the femur bone marrow during the x-ray radiography for constant mas and aec techniques. materials and methods: the dosxyznrc was used to simulate radiation doses in two human femurs during diagnostic radiography. egsnrc phantoms produced from actual ct images of human femurs were modified by adding seven micrometre ...
background coronary artery anomalies are not common, but could be very serious. objectives this study determines the frequency of coronary anomalies and normal variants by multi-detector-row computed tomography (mdct). patients and methods the results of cardiac mdct study in 2697 consecutive patients were analyzed retrospectively. acquisition was performed by a 64-detector row ct machine. imag...
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