نتایج جستجو برای: resonance
تعداد نتایج: 214426 فیلتر نتایج به سال:
conclusion adrenal iron in β-tm can be reliably measured in 3 tesla mri. the results highlight the absence of correlation between adrenal iron deposition both with serum ferritin and hepatic iron. results among patients, there was no significant correlation between plasma ferritin and adrenal t2*. significant difference was detected among t2* values of adrenals between the patient and control g...
introduction: the use of high-cost and high-tech magnetic resonance imaging (mri) has expanded over the past decade. a recently conducted research reported various causes with regard to their own country and healthcare system included aging population and advances in diagnostic technologies which could result in diagnostic services to become more applicable in clinical arena. increasing number ...
cerebral palsy is the most common chronic motor disorder of childhood, that affecting approximately 3 infants per 1000 live-births. the risk of brain injuries that potentially cause cerebral palsy has amplified with increasing in survival rates for preterm infants. in addition cerebral palsy has a huge economic impact, to immeasurable health, social, and psychological problems that affected chi...
Introduction: Staff and patient Movement in static magnetic field MRI scanner induces current density in the human tissues, so cause biologic effects in people. The aim of this study was the Modelling of current density induced by moving individual with different velocities in static magnetic field of magnetic resonance imaging. Materials and Methods: current ...
introduction radiofrequency planar microcoils are used to increase the resolution of magnetic resonance images of small samples. in this study, we aimed to design and fabricate a spiral planar microcoil constructed on a double-sided printed circuit board (pcb). it has four rings with an internal diameter of 241 microns tuned and matched at 63.8 mhz. materials and methods to achieve the maximum ...
چرخش صفحه پلاریزاسیون، یک موج اکوستیک در داخل یک کریستال منفرد با استفاده از تئوری (alpher & rubin) مورد مطالعه قرار داده شده است . عدم استفاده از تقریب الکترون آزاد منجر به پیدایش چرخش صفحه پلاریزاسیون موج اکوستیک میشود. میزان چرخش صفحه پلاریزاسیون، برحسب مقدار میدان مغناطیسی خارجی، و پارامتر (تعداد الکترون های هادی موثر برای هریون) بدست آمده است . حساسیت تشدید مکانیکی نسبت به تغییرات محاسبه ش...
The purpose of this study was to investigate magnetic resonance imaging (MRI) of the normal feline eyeand optic nerves using T1-weighted and T2-weighted images. A total of 6 healthy female domestic short haircats age 2-2.5 years and weighing 3.2 ± 0.4 kg were selected. Magnetic resonance imaging data werecollected using GEMSOW (Philips) at a magnetic field strength of 1.5 T. Dorsal, sagittal, a...
In this paper, nonlinear modal interactions caused by one-to-three internal resonance in a beam-mass-spring-damper system are investigated based on nonlinear system identification. For this purpose, the equations governing the transverse vibrations of the beam and mass are analyzed via the multiple scale method and the vibration response of the system under primary resonance is extracted. Then,...
روش تصویربرداری functional mri روشی غیر تهاجمی برای بررسی عملکرد تابعی مغز است. به بیان واضح تر برای بررسی اینکه برای هر دسته از اعمال بدن انسان کدام قسمت از مغز فعال است، ازاین نوع تصویربرداری استفاده می شود. همانطور که واضح است در یک لحظه مشخص بیش از یک قسمت از مغز انسان فعال است. لذا برای شناسایی عملکرد بخش خاصی از مغز نیاز داریم تا با یک روش خاص مراکز مختلف فعالیت در مغز را از یکدیگر متمای...
In this paper, the electronic conductance of a polyacetylene polymer embedded between two simple chains is studied by using transfer matrix method within the tight-binding and first neighbor approach. Also, by adding benzene molecules to polyacetylene we obtain the system conductance in its conversion to polystyrene polymer. The results show that as the number of benzene molecules in the middle...
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