منابع مشابه
Petrophysical and durability tests on sandstones for the evaluation of their quality as building stones using Analytical Hierarchy Process (AHP)
Due to their widespread availability, sandstones are commonly used as a natural stone for buildings, monuments and sculptures. In thecurrent study, nine sandstone samples from the Upper Red Formation (specified by the letters A, B, C, CG, S, S1, Sh, Tr and Min)were studied from a petrophysical point of view and their durability was evaluated. Then, their suitability as building stones wasassess...
متن کاملAlteration dependent physical-mechanical properties of quartz-diorite building stones
The microscopic and geomechanical properties of igneous building stones include the level of alteration, presence of micro cracks, peak strength, porosity, proportion of detrimental minerals, etc. Porosity is reportedly of a devastating impact on the peak strength of igneous rocks. The quartz diorite rock samples in this study were selected from five quarries in Natanz, Iran and subject to micr...
متن کاملBuilding Stones of Resilience of Vulnerable Older Persons
Introduction: Vulnerable older persons need sufficient resilience to deal with (age-related) adversities and safeguard their quality of life. In this study, we investigate which sources of strength vulnerable older persons use to deal adversities. Methods: This qualitative study is based on fifteen narratives of community-dwelling vulnerable older persons in Belgium, who were selected through ...
متن کاملEstimating the durability of building stones against Salt crystallization: considering the physical properties and strength characteristics
Salt crystallization is one of the most important weathering agents and may limit the durability of building stones. Salt crystallization induces stresses inside the pores of stones. Consequently, stone durability is closely related to its physical properties and strength. The purpose of this study was to propose a statistical model for estimating stone durability against salt crystallization c...
متن کاملVCO2 calorimetry: stop tossing stones, it’s time for building!
We followed with interest the discussion [1, 2] fueled by the study of Stapel et al. [3] who reported fairly accurate assessment of energy expenditure (EE) in critically ill patients based on ventilator-derived carbon dioxide production (VCO2). The proposed technique is elegant and valid but has inherent limitations. It is applicable in patients who are in one way or another ventilator-dependen...
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ژورنال
عنوان ژورنال: Science
سال: 1898
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.7.168.392-a