original article     the aim of this study was to design and build a software for noise propagation prediction (indoor and from indoor to outdoor spaces) which is being commonly used in industry.  in this regard, firstly a mathematical complex model was created based on existing relationships about noise propagation in indoor spaces and transmission through the walls and propagation in outdoor ...

noise is a common and widespread problem in workplaces. noise can lead to hearing loss, hypertension, nervous and mental disorders, annoyance and stress, sleep disturbance, negative impact on productivity and working capacity. the undesirable effects of noise on an individual or group are called annoyance. some personal and social characteristics can affect on annoyance. this study was aimed to...

from a long time ago, religious scholars have been competing to best determine the very miracles of the holy quran. from among these scholars some have tended to its language, style and structure while some other have been absorbed by its scientific miracles. the present study is an attempt to analyze one of these miracles, i.e. miracle of sound. quran was first revealed unto muhammad (pbuh) in...

Diagnosis of infected and affected dentine is an important factor in clininal restorative treatment of dentine. In this study, the IR and Raman spectra of the sound dentine, infected dentine and affected dentine are reported. The structure of infected dentine and affected dentine has been compared with the sound dentine and hydroxyapatite. It is shown while the infected dentine has lost its...