In ducts with varying cross-sectional area and sustaining a subsonic non-isentropic mean flow, the axially flow conditions affect acoustic energy balance of system. This is significant in understanding controlling thermo-acoustic phenomena, particularly combustors. work aims at quantifying change such configurations, using absorption coefficient, $\Delta$. The response duct to forcing determine...

background: changes in global temperature and its health effects have recently been under much investigated. consequently, these changes have affected mortality and morbidity rates which are important public health indices. the present study examines the effect of mean temperature on the frequency of hospitalization due to cardiovascular and respiratory diseases in ali ibn abi talib hospital of...

introduction the city population, in particular at the industrialized cities and centers of provinces, has increased dramatically in iran during recent decades. arak city is among of those industrialized cities as a centers of markazi province which has experienced a fast increase in population. this changes in population numbers tend to increase in consuming water resources as well as increasi...

introduction the city population, in particular at the industrialized cities and centers of provinces, has increased dramatically in iran during recent decades. arak city as center of markazi province is among those industrialized cities which has experienced a fast increase in population. these changes in population numbers tend to increase consuming water resources as well as increasing in en...

Global climate change poses one of the greatest threats to biodiversity. Most analyses of the potential biological impacts have focused on changes in mean temperature, but changes in thermal variance will also impact organisms and populations. We assessed the combined effects of the mean and variance of temperature on thermal tolerances, organismal survival, and population growth in Drosophila ...

the use of satellite data in an estimation of air temperature (ta) near the earth’s surface has turned into an effective way for a large area of high spatial and temporal resolution. throughout the present study, artificial neural network (ann) as well as m5 model tree were employed to estimate ta in khuzestan province (south west of iran), using satellite remotely sensed land surface temperatu...