Results 171 to 180 of about 18,916 (214)
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2023
The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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Solidification Behaviour of a H21 Tool Steel
Advanced Materials Research, 2014Solidification behaviour of a H21 tool steel has been studied. The aim of this work is to give better understanding of the as cast microstructure of the steel. The investigated H21 tool steel was made using induction vacuum furnace with air cooling. The microstructure observation was carried out using optical and electron microscopy.
Meilinda Nurbanasari +2 more
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Alloy Digest, 2013
Abstract LSS H21 is a hot work tool steel recommended for difficult hot work tooling applications. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on heat treating and machining. Filing Code: TS-713.
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Abstract LSS H21 is a hot work tool steel recommended for difficult hot work tooling applications. This datasheet provides information on composition, physical properties, hardness, and elasticity as well as fracture toughness. It also includes information on heat treating and machining. Filing Code: TS-713.
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Alloy Digest, 1971
Abstract AISI Type H21 is a tungsten-chromium hot-work tool and die steel having good red-hardness and resistance to abrasion with relatively good shock resistance. It will withstand high operating temperatures up to 1000 F for long periods of time.
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Abstract AISI Type H21 is a tungsten-chromium hot-work tool and die steel having good red-hardness and resistance to abrasion with relatively good shock resistance. It will withstand high operating temperatures up to 1000 F for long periods of time.
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Failures of AISI H21 die in copper hot extrusion
Materials at High Temperatures, 2014The failure of a tool steel die used for hot extrusion of copper has been investigated with a view to improving tool life. Hardness measurements and microstructural investigations together with finite element method have been used to map the local softening of the die material resulting in plastic deformation, thus the necessity of the die to be ...
M. Schwartz +3 more
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The erosion of H21 tool steel in molten A380 alloy
Journal of Materials Science, 2000The chemical interaction between H21 tool steel and molten A380 alloy was investigated at 700°C under dynamic conditions. Cr2O3-coated H21 samples were also investigated under the same condition for comparison. Samples were rotated at 300 rpm. The test time was varied between 1 and 36 hours.
M. Yan, Z. Fan
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Generalized Viral Illness Caused by an Intermediate Strain of Adenovirus (21/H21 + 35)
Journal of Infectious Diseases, 1980Ten isolates of an antigenically intermediate strain of adenovirus were recovered from eight persons who presented febrile upper respiratory illness, pneumonia, or multisystem disease between November 1976 and August 1978. Six isolates were recovered from four members of an extended family in which the other nine members all had serologic evidence of ...
J C, Hierholzer +2 more
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Transition of Mild Wear to Severe Wear in Oxidative Wear of H21 Steel
Tribology Letters, 2008Under atmospheric conditions at 400 °C, we studied the wear mechanism of H21 steel with different tempering states as a function of normal load. Typical oxidative wear was identified by X-ray diffraction patterns with predominant tribo-oxides of Fe3O4 and Fe2O3.
S. Q. Wang +4 more
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A molecular marker associated with the H21 Hessian fly resistance gene in wheat
Molecular Breeding, 1997Near-isogenic lines in conjunction with bulked segregant analysis were used to identify a DNA marker in wheat (Triticum aestivum L.) associated with the H21 gene conferring resistance to biotype L of Hessian fly [Mayetiola destructor (Say)] larvae. Near-isogenic lines were developed by backcross introgression BC3F3:4 (‘Coker 797’ * 4 / ‘Hamlet’) and ...
Y. W. Seo, J. W. Johnson, R. L. Jarret
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H21 These Barbies were dermatologists
British Journal of DermatologyAbstract Greta Gerwig’s 2023 Barbie blockbuster provided an infectious reminder that women are capable of the success of their male counterparts, as well as emphasizing the impressiveness of female empowerment and leadership. Luckily, in dermatology, we have had this leadership from the beginning.
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