نتایج جستجو برای: raw and mineral materials
تعداد نتایج: 16890923 فیلتر نتایج به سال:
Abstract For operational and quality control of ferrous metal ores, ionizing radiation sources are used, which main characteristics energy, activity half-life. The technological parameters the Americium-241, Thulium-170 Cadmium-109 have been compered, Americium-241 with an energy 60 keV a half-life 458 years has selected. Laboratory studies dependence integrated flux scattered gamma rays on con...
on three lines?(1) the measurement of the physical indices of the nutritional conditions of the people, (2) the measurement of the prevalence of deficiency diseases, and (3) the estimation of the food values (mainly protein, mineral and vitamin values) of the diets as indicated by their daily or monthly purchases of raw food materials. The deficiencies so ascertained have been sought to be reme...
today, scouring is one of the important topics in the river and coastal engineering so that the most destruction in the bridges is occurred due to this phenomenon. whereas the bridges are assumed as the most important connecting structures in the communications roads in the country and their importance is doubled while floodwater, thus exact design and maintenance thereof is very crucial. f...
TENORM are found in a wide variety of waste materials, some raw mineral ores and in some consumer products (in trace amounts) where molecules of radionuclides may be bound to specific minerals used in the manufacturing process and can result in increases in radiation exposures to workers and the public. The aim of this paper is to understand this problem and to develop effective ways to protect...
abstract the present study deals with a comparison between reactive and pre-emptive focus-on-form in terms of application and efficiency. it was conducted in an intermediate english class in shahroud. 15 male learners participated in this research and their age ranged from 18 to 25. a course book, new interchange 3, and a complementary book were used. every session the learners gave lectures o...
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