Results 211 to 220 of about 38,287 (265)
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Cooking cellulose in hot and compressed water
Chemical Communications, 2006Crystalline-to-amorphous transformation of cellulose in water, just like that for starch upon cooking called gelatinisation, is revealed at 320 degrees C and 25 MPa.
Shigeru, Deguchi +2 more
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Dissolution Kinetics of Hot Compressed Oxide Glasses
The Journal of Physical Chemistry B, 2017The chemical durability of oxide glasses is an important property for a wide range of applications and can in some cases be tuned through composition optimization. However, these possibilities are relatively limited because around 3/5 of the atoms in most oxide glasses are oxygens. An alternative approach involves post-treatment of the glass.
Nerea Mascaraque +5 more
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Hot compression behaviors and microstructural evolution of beryllium by vacuum hot pressing
Materials Letters, 2021Abstract The uniaxial compressive (UAC) performance of beryllium by vacuum hot pressing (VHP) was investigated in the temperature range from 250 to 550°C and strain rate from 0.01 to 10 s−1. Serrated flow and yield point showed in the stress–strain curve are caused by Portevin-Le Chatelier effect (PLCE).
Xinghui He +11 more
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Hot Deformation Behavior during the Hot Compression of AZ31 Alloy
Advanced Materials Research, 2010The hot deformation behavior of as-cast AZ31 magnesium alloys have been investigated at 200~400°C and strain rates 0.001~1s-1 by means of hot compression tests on a Gleeble-1500D thermal-mechanical simulator. We have analyzed the flow stress-strain curve and presented the constitutive equation by calculating stress exponent, activation energy and Zemer-
Shu Li Sun +4 more
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Quinacridone Solubility in Hot-Compressed Water
Journal of Chemical & Engineering Data, 2007The solubility of quinacridone in hot-compressed water was measured for the first time at temperatures from (453.4 to 592.9) K and at a pressure of 24 MPa with a flow-type apparatus. The solubility varied from 1.07 × 10-5 mol·kg-1 at 453.4 K to 5.89 × 10-3 mol·kg-1 at 592.9 K.
Kiwamu Sue +5 more
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Hot-wire measurements in compressible flows
International Congress on Instrumentation in Aerospace Simulation Facilitie, 2003Conditions for hot-wire fluctuation measurements at high velocities are considered. Particular attention is given to the determination of sensitivity coefficients, the conditions for the application of constant-resistance and constant-current anemometers, and measurements at supersonic velocities. It is concluded that high-velocity measurements will be
V.A. Lebiga, V.N. Zinoviev
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A regular hot-powder compression regime
Journal of Engineering Physics, 1990We propose a new analytical solution for the problem familiar from the theory of hot compression in connection with the axial unilateral compression of a viscous porous material in a cylindrical mold.
A. M. Stolin +2 more
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Dynamical instability of hot and compressed nuclei
Nuclear Physics A, 1989Abstract The dynamical evolution of a hot and compressed nucleus is described by means of an extended liquid-drop model. Using only the continuity equation and the energy conservation we show that the system expands after a while. The possible global instabilities of the drop are studied by applying the general conditions of stability of dynamical ...
Ngo, C., Ngo, H., Leray, S., Spina, M.E.
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An analysis of the isothermal hot compression test
Metallurgical Transactions A, 1992The nominally isothermal, uniaxial hot compression test has been analyzed with special reference to the effects of temperature nonuniformities and friction on sample deformation and flow stress estimates. A simple one-dimensional analysis was used to establish the influence of initial temperature nonuniformities, strain rate, and the temperature ...
S. I. Oh, S. L. Semiatin, J. J. Jonas
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2005
Abstract This article describes the use of compression tests, namely, cylindrical compression, ring compression, and plane-strain compression tests at elevated temperatures. It discusses the effects of the temperature, strain rate, and deformation heating on metals during the cylindrical compression test, with the help of flow curves ...
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Abstract This article describes the use of compression tests, namely, cylindrical compression, ring compression, and plane-strain compression tests at elevated temperatures. It discusses the effects of the temperature, strain rate, and deformation heating on metals during the cylindrical compression test, with the help of flow curves ...
openaire +1 more source