the purpose of this research was to study the role of non-governmental organization inpreserving of urban green areas in the city of tehran. this is a descriptive-correlationresearch method. population of this study was 120 active members of two non-governmentalorganizations in tehran. after distributing the questionnaires, 62 questionnaires werereturned. content and face validity of the instru...

PURPOSE We aimed to determine the effective dose given to patients during neuroradiological C-arm computed tomography (CT) procedures. MATERIALS AND METHODS Measurements were performed on 48 patients using a dose-area product (DAP) meter. A PC-based Monte Carlo program (PCXMC, STUK, Helsinki, Finland) was used to calculate the effective dose from the DAP values of each patient. Organ doses we...

The paper presents the results of studies on selecting a solid sorption material for absorbing liquid crop protection agents which permeate samples of protective clothing fabrics. The sorption materials were investigated and selected with an assumption that they should have a high recovery coefficient for biologically active substances, used as active ingredients in crop protection agents, at a...

Introduction: Ultraviolet radiation down to 195 nm penetrates to the surface of the Martian north polar ice cap during the polar summer on account of the lack of an ozone column, in contrast to the Earth where only radiation above ~290 nm penetrates to the surface (except under ozone depletion, when radiation down to ~280 nm may penetrate). During the winter, spring and fall some ozone producti...

0

one of the most important discharge control ways in hydraulic structures is side weir which is used in irrigation, water distribution, waste-water engineering, drainage, flood control and other water related projects.in order to increases cm value and control on water surface when there is restriction in the weir length(l), side weir with different geometry is used. in present research seventhl...