Soheila Hafezi

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One of the most important and prevalent isotopes of radium (Ra) in the human food chain, and especially in drinking water, is 226Ra. To determine the contribution of this radionuclide to the annual effective dose to the public in Iran, a national program for determination of this radionuclide was established. Over 500 water samples from different surface(More)
Environmental education as a learning process increases people's knowledge and awareness about the environment. Although in some countries, the Environmental Communal Education (ECE) is the core of the environmental education by formal and informal organizations and groups, but, it has not clarified the meaning of the ECE’s concept. Therefore the aim of(More)
The web is playing a central role in distance education. The word “usability” is usually synonymous with functionality of the system for the user. Also, usability of a website is defined as something that can be used by a specific group of people to carry out specific objectives in an effective way, with efficiency and satisfaction. There are some useful(More)
Many materials that are usually found in the earth's crust contain small but measurable amount of naturally occurring radioactivity (NORM). Some particular ores contain natural radionuclide at levels much higher those usually present in earth's crust; and are also subject to radioisotope enrichment, during technological process, known as technologically(More)
Background: Impairment of exercise tolerance in chronic respiratory disorders and in particular, chronic obstructive pulmonary disease (COPD), has important implications on health-related quality of life, hospitalization rate and survival. Although COPD patients have shortness of breath, programmed exercise can increase the activity tolerance in these(More)
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