damavand is a large dormant stratovolcano in the alborz mountains of northern iran located in one of the most populous provinces, which could be adversely affected by tephra fall from damavand. the youngest known eruption is a lava flow on the western flanks with an age of 7.3 ka. the volcanic products are predominantly porphyritic trachyandesite. three major young pumice deposits, named here a...

to assess the effect of time and temperature (in the pumice mixing phase of olive oil extraction) on the quantity and quality features of the extracted oil, a series of experiments comprised of three levels of mixing time (10, 20, and 30 min), and three levels of mixing temperature (30, 45, and 60°c) were carried out. the recorded data were analyzed in the framework of a randomized complete blo...

PURPOSE To evaluate the shear bond strength of resin luting agent to dentin surfaces cleansed with different agents like pumice, ultrasonic scaler with chlorhexidine gluconate, EDTA and the influence of these cleansing methods on wetting properties of the dentin by Axisymmetric drop Shape Analysis - Contact Diameter technique (ADSA-CD). MATERIALS AND METHODS Forty coronal portions of human th...

Nitrate adsorption onto the physically and chemically modified pumice was investigated as an effort for reducing groundwater pollution. The treatments were heating at temperatures of 300°C, 450°C, 600°C physical soaking in acid solutions (HCl, H 2 SO 4 , HNO 3 ) chemical treatments. performed a batch system room temperature (25±1°C) with optimum condition (pH 4; 0.3 g/L adsorbent dose; <63 µ...

PURPOSE The purpose of this study was to assess the periodicity of the recall examination and frequency and most often used technique for cleaning children's teeth. The resulting data were compared to current scientific evidence and recommendations to determine the appropriateness of practices by board-certified pediatric dentists. METHODS A 28-item questionnaire was mailed to the 1,034 membe...

Natural rocks of magmatic origin are alternative precursors in alkali-activated materials and provide opportunities the search for more environmentally friendly binders compared to portland cement. The pumice is one these its amorphous structure chemical composition make it candidates as a precursor producing geopolymer binder when finely ground. Since majority reserves located Turkey increases...