1. introduction one of the most important conditions to have dusty weather beside of unstable weather is existence or non-existence of humidity. unstable weather having enough humidity will produce rain and thunder storm, else if the result will be dust storm. number of particles of dusty storm is depended to wind speed, sec of soil and its dimension. furthermore, vegetation type has importance...

1. introduction while human habitation was formed as concentrated and stable communities, air pollution had become perceptible on human life. by passing of time and the improvement of thriving and particularly by the industrial revolution commencement, air pollution gradually has converted into an international issue, principally in the present times (ghanbari and azizi, 1388: 16). whereas air ...

A comparison has been made of the air-kerma standards for low-energy x rays at the National Institute of Standards and Technology (NIST) and the Physikalisch-Technische Bundesanstalt (PTB). The comparison involved a series of measurements at the PTB and the NIST using the air-kerma standards and two NIST reference-class transfer ionization chamber standards. Results are presented for the refere...

1. General legislative procedures in environmental control 2. Legislative procedures concerning ambient air quality standards 3. The social and economical aspects in setting air quality standards. 4. Summary of the WHO guidelines 4.1 Guideline values based on effects other than cancer 4.2. Criteria Based on Carcinogenic Effects 4.3. Guidelines Based on Ecological Effects on Vegetation 4.4 . Use...

aims: nowadays nosocomial infection control is one of the important management issues in neonatal intensive care unit that in this context, the nicu’s physical structure can improve infection control processes or interfere it. the aim of the present study is assessing physical environment of neonatal intensive care unit from the perspective of nosocomial infection control indicators. methods: t...

Buildings are expected to provide healthy and comfortable indoor environmental conditions for their users. Such have diverse dimensions, including thermal, visual, air quality, auditory, olfactory aspects. Indoor quality standards, guidelines, codes typically inform professionals in the building design operation phase view of procedural, contractual, legal boundary conditions. Given this critic...

introduction occurrence of heavy and rainstorm events is among the characteristics of arid and semi-arid regions all over the world and particularly in iran which is causing large floods and debris town. how ever, they can be used to supply and store water by controlling and exploiting the run off water floods. indexes of atmospheric instability are very useful scientific instruments to underst...