نتایج جستجو برای: micro structure of intact rocks
تعداد نتایج: 21239398 فیلتر نتایج به سال:
highly crystalline bi3+-doped cadmium oxide (cdo) sub-micron structures were synthesized by calcination the obtained precursor from a sol-gel reaction. the reaction was carried out with cadmium nitrate (cd(no3)2.4h2o), bismuth nitrate (bi(no3)3.5h2o) and ethylene glycol (c2h6o2) reactants without any additives at 80°c for 2h. resulting gel was calcined at 900 °c with increasing temperature rate...
available online at http://meteoritics.org 1493 © The Meteoritical Society, 2005. Printed in USA. Bosumtwi impact structure, Ghana: Geochemistry of impactites and target rocks, and search for a meteoritic component Xiongxin DAI1, 4, Daniel BOAMAH1, Christian KOEBERL1*, Wolf Uwe REIMOLD2, Gordon IRVINE3, and Iain MCDONALD3 1Department of Geological Sciences, University of Vienna, Althanstrasse 1...
A model for heat-recirculating micro combustor is developed. It investigates the structure of laminar, one-dimensional and steady state flame propagation in uniformly premixed wood particles with considering the effects of heat recirculation caused by configuration of micro combustor. The flame structure is divided into three regions: a preheat-devolatilization zone where the rate of the gas-ph...
investigating the feasibility of a proposed model for geometric design of deployable arch structures
deployable scissor type structures are composed of the so-called scissor-like elements (sles), which are connected to each other at an intermediate point through a pivotal connection and allow them to be folded into a compact bundle for storage or transport. several sles are connected to each other in order to form units with regular polygonal plan views. the sides and radii of the polygons are...
abstract in aggregate, active forms of reactive silica with mineral names are sometimes associated with sand and gravel in concrete mixture. alkali hydroxides originated from alkalis in the cement or other resources form an alkaline silica gel with this reactive silica which becomes swallowed and expanded during time causing damage to concrete. there have been growing researches on alkaline r...
Evaluation of the excavation-induced ground movements is an important design aspect of supporting system in urban areas. This evaluation process is more critical to the old buildings or sensitive structures which exist in the excavation-affected zone. Frame distortion and crack generation are predictor, of building damage resulted from excavation-induced ground movements, which pose challenges ...
The concrete–rock interfacial transition zone (ITZ) is generally considered the weak layer in hydraulic engineering, for it more permeable than intact concrete or rocks. water permeability of ITZ a critical parameter concerned with structural safety and durability. However, pore structure has not been investigated previously, mathematical model established. This study performed multi-scale expe...
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