نتایج جستجو برای: ray methods

تعداد نتایج: 2121726  

Introduction: As the absorption of radiation in environment is increasing, the present study was performed to evaluate the knowledge and practices of Babol’s dentists about x-ray protection . Materials &Methods: This cross-sectional study was designed to assess the knowledge and practices of dentists. The questionnaires were distributed among 70 dentists in Babol city. Analysis of the ...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده برق و الکترونیک 1390

there are many approaches for solving variety combinatorial optimization problems (np-compelete) that devided to exact solutions and approximate solutions. exact methods can only be used for very small size instances due to their expontional search space. for real-world problems, we have to employ approximate methods such as evolutionary algorithms (eas) that find a near-optimal solution in a r...

Journal: :iranian journal of radiology 0
lida gholamkar department of medical radiation engineering, science and research branch, islamic azad university, tehran, iran ali asghar mowlavi physics department, hakim sabzevari university, sabzevar, iran; international center for theoretical physics (ictp), associate federation scheme, medical physics field, trieste, italy; physics department, hakim sabzevari university, sabzevar, iran. tel: +98-5144012521 mahdi sadeghi radiation application research school, nuclear science and technology research institute, tehran, iran mitra athari department of medical radiation engineering, science and research branch, islamic azad university, tehran, iran

conclusion by comparing the results, we saw that w/rh anode/filter combination is the best choice in breast mammography imaging because of the lowest delivered dose in comparison with w/ag and rh/al. moreover, breast thickness and g value have significant effects on mgd. objectives the aim of this study was to determine the average absorbed dose of x-ray radiation in the glandular tissue of the...

Journal: :Environmental Health Perspectives 1995
H Hu A Aro A Rotnitzky

In vivo X-ray fluorescence (XRF) measurement of bone lead concentration (XRF) has emerged as an important technique for future epidemiological studies of long-term toxicity. Several issues germane to epidemiologic methodology need to be addressed, however. First, sources of variability in measurements of bone lead need to be quantified, including imprecision related to the physical measurement ...

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