Results 301 to 310 of about 463,274 (346)
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2019
Porosity in carbonate rocks, most commonly limestones and dolostones, is of great importance to study since around half of world’s hydrocarbon reserves are made up of dolomite and limestone, which formed mostly in a shallow marine environment and usually close to where such sediments originate from the source rocks.
Soumyajit Mukherjee, Troyee Dasgupta
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Porosity in carbonate rocks, most commonly limestones and dolostones, is of great importance to study since around half of world’s hydrocarbon reserves are made up of dolomite and limestone, which formed mostly in a shallow marine environment and usually close to where such sediments originate from the source rocks.
Soumyajit Mukherjee, Troyee Dasgupta
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ChemInform, 2006 AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
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Shrinkage Porosity and Gas Porosity
2008Abstract This article provides a detailed discussion on the causes of formation of shrinkage porosity and gas porosity along with the methods involved in eliminating them. It discusses the process of porosity formation and the factors affecting porosity formation, including alloy composition, external pressure, and cooling conditions.
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2011
Porosity in castings seems to be entrained air bubbles, although sometimes it is a more uniform dispersion of bifilms partly or fully inflated with a gas from solution in the melt. At other times what appears to be shrinkage porosity is not shrinkage at all, but rather a mass of oxides generated by the entrainment of the oxide surface in the turbulence
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Porosity in castings seems to be entrained air bubbles, although sometimes it is a more uniform dispersion of bifilms partly or fully inflated with a gas from solution in the melt. At other times what appears to be shrinkage porosity is not shrinkage at all, but rather a mass of oxides generated by the entrainment of the oxide surface in the turbulence
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Welding International, 1992
Porosity constitutes the main defect in aluminium welds. It is generally assumed that the basic reason for its formation is the presence of hydrogen. Hydrogen can originate from a variety of sources. Major sources of hydrogen are surface contamination of both the parent and deposited metals in the form of hydroxides, hydrocarbons or oxides with ...
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Porosity constitutes the main defect in aluminium welds. It is generally assumed that the basic reason for its formation is the presence of hydrogen. Hydrogen can originate from a variety of sources. Major sources of hydrogen are surface contamination of both the parent and deposited metals in the form of hydroxides, hydrocarbons or oxides with ...
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, 2019
This work investigates the effect of Winkler/Pasternak/Kerr foundation and porosity on dynamic behavior of FG plates using a simple quasi-3D hyperbolic theory. Four different patterns of porosity variations are considered in this study. The used quasi-3D
Farouk Yahia Addou +6 more
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This work investigates the effect of Winkler/Pasternak/Kerr foundation and porosity on dynamic behavior of FG plates using a simple quasi-3D hyperbolic theory. Four different patterns of porosity variations are considered in this study. The used quasi-3D
Farouk Yahia Addou +6 more
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Porosity of restorative resins
European Journal of Oral Sciences, 1983Abstract – Polyethylene tubes were filled with different types of composite resins using either the bulk‐packing technique or the syringe injection technique. The porosity of the specimens was studied. Specimens made by light‐activated systems were less porous compared to specimens made by two‐paste systems. Use of the injection technique was followed
Gotfredsen, P, Hörsted, P, Kragstrup, J
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Porosity and Approximate Derivatives
Canadian Journal of Mathematics, 1986In recent years, a considerable amount of research has been devoted to questions involving set porosity, particularly as it relates to differentiation theory. We may express the type of question in which we are interested by using the language of path derivatives and sequential derivatives.
G. Petruska +3 more
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An overview on engineering the surface area and porosity of biochar.
Science of the Total Environment, 2020Lijian Leng +8 more
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POROSITY: VI. DETERMINATION OF POROSITY BY THE METHOD OF GAS EXPANSION*
Journal of the American Ceramic Society, 1922ABSTRACT Theory of the method.—The pore volume is measured by allowing the gas which fills the pores to expand into a measured volume and measuring the accompanying fall in pressure. Applicability.—The method is in general applicable to pieces of any size and shape and to all classes of porous bodies or materials. A new porosimeter.—For rapid work with
Elmer N. Bunting, Edward W. Washburn
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