نتایج جستجو برای: resonance ultrasonic spectroscopy

تعداد نتایج: 385437  

Journal: :iranian journal of oil & gas science and technology 2014
kobra kalvandi sina sodagar

resonances are intrinsic characteristics of an elastic object, which are completely independent of thesource of excitation. the appropriate utilization of the information contained within the resonancespectra and the identification of the resonance frequencies of the object can be used as a potent toolfor material characterization. in this paper, a new mathematical model for the wave diffractio...

Resonances are intrinsic characteristics of an elastic object, which are completely independent of the source of excitation. The appropriate utilization of the information contained within the resonance spectra and the identification of the resonance frequencies of the object can be used as a potent tool for material characterization. In this paper, a new mathematical model for the wave diffrac...

Journal: :journal of paramedical sciences 0
vahid changizi technology of radiology and radiotherapy department, center of health information management research, allied medical sciences school, tehran university of medical sciences, tehran, iran farahnaz azarakhsh department of biology, science and research branch, islamic azad university, tehran, iran mehdi pooladi department of biology, science and research branch, islamic azad university, tehran, iran

nowadays brain tumors remain as a significant cause of morbidity and mortality and are often treatment refractory. the grading of brain tumor has an important implication in clinical management. currently, magnetic resonance spectroscopy (mrs) is an important modality in evaluating and grading brain tumors. the aim of this study is  evaluation of metabolites in the differentiation of brain tumo...

Journal: :iranian journal of child neurology 0
guruprasada shetty 1.department of pediatrics, father muller medical college,mangalore karnataka, india kadke shreedhara avabratha 1.department of pediatrics, father muller medical college,mangalore karnataka, india boodyar sanjeev rai 1.department of pediatrics, father muller medical college,mangalore karnataka, india

how to cite this article: shetty g, avabratha k.s, rai b.s. ring-enhancing lesions in the brain: a diagnostic dilemma. iran j child neurol. 2014 summer;8(3): 61-64. abstract the most common radiological abnormality seen in young indian patients with epilepsy is single small enhancing (ring/disc) computed tomographic (ct) lesions. the two most common differential diagnosis of this lesion in clin...

2004
T. Stepinski M. Jonsson

NDE of airspace sandwich structures is often performed using a simple resonant transducer sensing the information in the frequency domain obtained due to the constructive and destructive interference of elastic waves. Application field of ultrasonic narrowband ultrasonic spectroscopy (NBUS) is likely to increase rapidly with the growing application of layered structures in modern aircraft, for ...

2014
Yoshimi Kobayashi Makoto Hayashi Fumihiko Yoshino Muneaki Tamura Ayaka Yoshida Haruna Ibi Masaichi-Chang-il Lee Kuniyasu Ochiai Bunnai Ogiso

One approach to enhance the disinfection of root canals in endodontic treatment is ultrasonic irrigation with sodium hypochlorite. Reactive oxygen species, such as hydroxyl radical, are generated by biological defense systems to kill invading bacteria. Ultrasonic irrigation with hydrogen peroxide may be a promising option to increase hydroxyl radical generation. We examined the bactericidal eff...

Journal: :Biomechanics and modeling in mechanobiology 2002
T Lee R S Lakes A Lal

The method of resonant ultrasonic spectroscopy (RUS) was evaluated for bovine bone and compared with the traditional wave transmission ultrasound method. In RUS, the resonance structure of a cubic or rectangular specimen is scanned. For some low-damping materials, a single measurement yields sufficient resonant frequencies to determine all of the anisotropic elastic constants. Bone has a high v...

Journal: :iranian journal of radiology 0
feng chen department of radiology, hainan general hospital, haikou, china min guo psychological research center, hainan general hospital, haikou, china; psychological research center, hainan general hospital, haikou, china. tel/fax: +86-89868622423 tao liu department of neurology, hainan general hospital, haikou, china xiang ling jiang psychological research center, hainan general hospital, haikou, china jian jun li department of radiology, hainan general hospital, haikou, china jun cheng guo psychological research center, hainan general hospital, haikou, china

conclusion distinct neurochemical and histological structure changes (cortico-striatal-thalamic-cortical cycle) exist in patients with first-episode ocd. 1h-mrs is capable of identifying these changes by assessing metabolic abnormalities. objectives this study aims to use magnetic resonance spectroscopy (mrs) to discover substance-metabolism abnormalities of brain circuits in patients with firs...

Journal: :iranian journal of radiology 0
hasan aydin mri department, s.b. ankara diskapi yildirim beyazit education and research hospital, irfan bastug st.,, turkey +90-5057994013, [email protected] nilay aydin oktay mri department, s.b. ankara diskapi yildirim beyazit education and research hospital, irfan bastug st.,, turkey +90-5057994013, [email protected] volkan kizilgoz mri department, s.b. ankara diskapi yildirim beyazit education and research hospital, irfan bastug st.,, turkey +90-5057994013, [email protected]; mri department, s.b. ankara diskapi yildirim beyazit education and research hospital, irfan bastug st.,, turkey +90-5057994013, [email protected] elif altin altin mri department, s.b. ankara diskapi yildirim beyazit education and research hospital, irfan bastug st.,, turkey +90-5057994013, [email protected] idil gunes tatar mri department, s.b. ankara diskapi yildirim beyazit education and research hospital, irfan bastug st.,, turkey +90-5057994013, [email protected] baki hekimoglu vascular interventional department, s.b. ankara diskapi yildirim beyazit education and research hospital, turkey

background epilepsy, a well-known mostly idiopathic neurologic disorder, has to be correctly diagnosed and properly treated. up to now, several diagnostic approaches have been processed to determine the epileptic focus. objectives the aim of this study was to discover whether proton-mr-spectroscopic imaging (mrsi) aids in the diagnosis of temporal lobe epilepsy in conjunction with classical ele...

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