microwave energy has potential for the efficient heating of minerals. minerals or materials, which couple to microwave energy are called dielectrics and many valuable minerals are found to be dielectric. the mineral ilmenite is one which shows good dielectric heating characteristics. in this paper, the effect of microwave heat energy on the partial reduction of oxidized ilmenite oxidized in ...

the sirri jacket offshore platform was designed and installed in persian gulf of iran in 1975 and has been in service since that time. the importance of offshore structure's stability and the failure of this kind of structure during an earthquake in different active zones revealed that earthquake loading has to be considered. in this paper, magnetorheological (mr) fluid dampers have been propos...

for large and complex reacting systems, computational efficiency becomes a critical issue in process simulation, optimization and model-based control. mechanism simplification is often a necessity to improve computational speed. we present a novel approach to simplification of reaction networks that formulates the model reduction problem as an optimization problem and solves it using genetic al...

in this study, synthesis of copper nanoparticles and effect of the reaction conditions on the particle size were investigated. the copper nanoparticles were synthesized and stabilized in a narrow temperature range in the presence of polyvinylpyrrolidone under nitrogen atmosphere. reaction temperature and concentration ratio of the reducing agent to the precursor (r/p) as two main conditions i...

introduction: restoration of normal anatomic alignment is a key component of the treatment of distal radius fractures (drf). this study aimed to evaluate the accuracy of ultrasonography (us) in determining the adequacy of closed reduction in these fractures. methods : drf patients admitted to the emergency department of al-zahra hospital, isfahan, iran from september 2011 to 2012, were enrolled...

the ministry of health, treatment and medical education of iran has recently announced an estimated figure of 200,000 injecting drug users (idus). the aim of this study was to pilot a national program using demographics, types of drug abuse and prevalence of blood-borne infections among idus.in order to elicit data on demographics, types of drug abuse and prevalence of blood-borne infections am...

due to shortage of precipitation and the spatial and periodical disparity of rainfalls, iran iscounted among the arid and semi-arid countries of the world, and therefore the water utilities have put thecontrol of consumption and efficient use of water high on their priorities. water consumption management isconsidered as a field of energy management, and the impacts of effective measure related...

background: in order to transfer teachers’ knowledge, the presence of students is necessary in the classroom. despite numerous studies on the causes of absence, the strategies of its reduction have not been yet investigated and this study intends to address this issue. methods: inthis cross-sectional study 401 students were participated who were selected with systematic random sampling. the stu...

background: overexpression of rad51 protein in many tumor cells has been proven to increase radioresistance and can be related to the resistance of chemosensitivity of tumor cells. this preliminary study was conducted to determine the relationship between the rad51 expression level in nasopharyngeal carcinoma and the response of the treatment based on the measurement of the tumor reduction. met...

Background: Ramsar, a northern city in Iran, lies on the coast of the Caspian Sea. This city has areas with some of the highest levels of natural radiation measured to date. The radon concentration in some areas of Ramsar is up to 3700 Bq m–3. On the other hand, due to high level of humidity, damp-proof barriers should be used in construction of new buildings in radon prone areas of this cit...