Ultrafine gamma-Fe(C), alpha-Fe(C) and Fe3C particles were prepared by arc-discharge synthesis in a methane atmosphere. The phases, morphology, structure and surface layer of the particles were studied by means of X-ray diffraction (XRD), transmission electron microscopy (TEM) techniques and ...
Gamma-ray bursts (GRBs) are the most violent explosions in the universe, seen primarily as bright, short flashes of gamma-rays. Long GRBs are most likely associated with the violent death of a very massive star. They are thus believed to originate within regions of recent or ongoing star ...
Using the laser pyrolysis method, single phaseγ′-Fe4Nnanoparticles were prepared by a two step method involving preparation of nanoscale iron oxide and a subsequent gas–solid nitridation reaction. Single phaseFe3CandFe7C3could be prepared by laser pyrolysis fromFe(CO)5and3C2H4directly. Characteriza...
C-vacancy concentration in cementite, Fe3C1-z, in equilibrium with alpha-Fe[C] and gamma-Fe[C]CementiteDiffractionIron alloysFirst-principles calculationsThermodynamic modelingNew data are presented on the ambient-temperaturedoi:10.1016/j.actamat.2014.11.046Leineweber...
It was found that single Fe3C phase was obtained from the pre-reduced powders containing 3.26 and 0.59 wt.% oxygen for carburization periods of 15 and 30 min. The kinetic data for the carburization under pure CH4 indicates that there are essentially two successive distinct regimes: reduction of...
PRODUCTION OF NON-AGING HOT ROLLED STEEL PLATE WITH HIGH AVERAGE GAMMA-VALUEPURPOSE: To produce a hot rolled steel plate having high average γ-value as a substitute for that of cold rolled steel sheet, also having stable non-aging characteristic, and excellent in characteristics at a low cost...
The EGS3 Monte-Carlo electron-photon transport simulation package has been used to calculate dose equivalent per unit fluence vs depth curves for broad parallel beams of mono-energetic electrons, positrons and photons incident on a 30-cm... Rogers,WO D. - 《Health Physics》 被引量: 230发表...
Search for ${B}^{0}$ Decays to Invisible Final States and to $$nu${}overline{$nu${}}$gamma${}$ 来自 APS 喜欢 0 阅读量: 11 摘要: We establish upper limits on branching fractions for ${B}^{0}$ decays to final states where the decay products are purely invisible (i.e., no...