Results 221 to 230 of about 38,287 (265)
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Compressible flow hot-wire calibration
Experiments in Fluids, 1997A resistance thermal anemometer operated in compressible flow is sensitive to density, velocity, and total temperature fluctuations. To address these effects, a relatively inexpensive compressible flow calibration facility has been developed and tested.
R. Johnston, S. Fleeter
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Acrolein synthesis from glycerol in hot-compressed water
Bioresource Technology, 2007Glycerol conversion was conducted in hot-compressed water (HCW: 573-673 K, 25-34.5 MPa) using a batch and a flow apparatus and the influences of temperature, H(2)SO(4), glycerol concentration, and pressure, were examined. The yield of acrolein was enhanced by higher glycerol and H(2)SO(4) concentration, and higher pressure.
Masaru, Watanabe +4 more
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Isothermal forging of AA2618 + 20% Al2O3 by means of hot torsion and hot compression tests
Materials Science and Engineering: A, 2004Abstract The isothermal forming of AA2618 + 20% Al 2 O 3 was studied by employing hot torsion and hot compression tests in the temperature and strain rate ranges of 350–500 °C and 10-3-1 s-1 strain rate, respectively. The processing and stability maps of the material were calculated following the dynamic material model leading to identification of ...
P. Cavaliere +2 more
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Hot-compression behavior of Al alloy 5182
Journal of Central South University, 2012Hot-compression of aluminum alloy 5182 was carried out on a Gleeble-1500 thermo-simulator at deformation temperature ranging from 350 °C to 500 °C and at strain rate from 0.01 s−1 to 10 s−1 with strain range from 0.7 to 1.9. The microstructures and macro-textures evolution under different conditions were investigated by polarized optical microscopy and
Jian-guo Tang +2 more
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Compressive creep behaviour of hot-pressed PbTe
Scripta Materialia, 2017Abstract Creep deformation is of concern in PbTe thermoelectric modules operating for years at high homologous temperatures while being subjected to internal or external stresses. The creep strain rates of hot-pressed PbTe are measured at 400 °C; a power-law is found, with a stress exponent n = 1.7 at low stresses (2–7 MPa) and n = 4.4 at high ...
C.C. Li, G.J. Snyder, D.C. Dunand
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A wedge plastometer for hot multistage compression testing
Journal of Mechanical Working Technology, 1978Abstract In many hot-forming processes, the workpiece is deformed in a number of stages, with a short time interval between each stages during which some recovery or recrystallization occurs and the subsequent yield-stress level is reduced. Multistage hot-forming processes include hammer forging, rotary forging, tandem rolling and ring rolling.
J.B. Hawkyard, C. Highton, P.H. Lo
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Compressive creep of hot pressed silicon carbide
Materials Science and Engineering: A, 2010Abstract Silicon carbide has a good match of chemical, mechanical and thermal properties and therefore is considered an excellent structural ceramic for high temperature applications. The aim of the present work is compressive creep evaluation of liquid phase sintered silicon carbide with aluminum and rare earth oxide as sintering aids.
C.R.M. Silva +3 more
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Model for the evolution of hot and compressed spherical nuclei
Zeitschrift f�r Physik A Atomic Nuclei, 1986A hydrodynamical approach and the Thomas Fermi approximation have been used to study the evolution of hot and compressed nuclei. Spherical symmetry was assumed in the calculation. The dynamical equations have been transformed into “Schrodinger like” equations (using the Madelung transformation) and were solved numerically.
J. Nemeth +3 more
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Hot-Hole Streaming in Uniaxially Compressed Germanium
1996The streaming motion of charge carriers occurs in sufficiently strong electric field provided that the threshold scattering mechanism (e.g. optical-phonon emission) exists. It is the cyclic process consisted of scattering-free acceleration of holes up to the optical-phonon energy, emission of an optical phonon and the return to the region of small ...
I. V. Altukhov +3 more
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Hot compression of nickel with harmonic structure
2015It is well known that grain size is an important element that affects the mechanical properties of materials, therefore grain refinement strengthening is of extremely high interest. However, materials with an homogeneous nano or ultrafine grained structure show, together with high strength, limited ductility due to their plastic instability.
Okada, Shun +3 more
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