منابع مشابه
Neutron activation analysis of nickel purified by floating zone-refining and anion exchange.
Nondestructive neutron activation analysis was performed on the nickel purified by floating zone-refining and anion exchange. It is found that floating zone-refining in vacuum is effective to remove Na, Sc, Cr, Zn, As, Ag, Sb and Hg through vaporization in addition to elimination of Se, Sb, Ta, Sm and Tb through segregation. Anion exchange method is also effective to separate Fe, Co, Zn, Mo, Hg...
متن کاملpH-zone-refining countercurrent chromatography.
A recently developed preparative technique, pH-zone-refining countercurrent chromatography (CCC), separates organic acids and bases according to their pKa and hydrophobicity. The hydrodynamic mechanism of pH-zone-refining CCC is illustrated in two elution modes along with a simple mathematical analysis. Separations include acidic and basic derivatives of amino acids and peptides, hydroxyxanthen...
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The crystal growth of high-temperature oxide superconductors has been hampered by the complexities of these materials and the lack of knowledge of corresponding phase diagrams. The most common crystal growth technique adopted for these materials is the so-called “Flux” method. This method, however, suffers from several drawbacks: (i) crystals are often crucible and flux contaminated; (ii) cryst...
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The discovery of superconductivity at temperatures above 30 K in KxFe2-ySe2 compounds has attracted considerable attention [1]. The crystal structure of KxFe2-ySe2 descends from the well-known ThCr2Si2 structure with vacancies at the Fe sites. It was soon found that magnetism and superconductivity coexist in AxFe2-ySe2 (A = K, Rb, and Cs) [2-3]. Even in single crystals which show full shielding...
متن کاملHeat Affected Zone in Surfacing Chromium Ledeburitic Steel
Repair welding is not used enough in the industry 1 . One of the reasons for this lies in the insufficient and unrealiable knowledge in many segments of this area. A very important part is having appropriate knowledge of metallurgical processes in heating of the base material 2-4 . Unsuitable heating deteriorates the microstructure as it reduces toughness and fracture behaviour of the weld 5 . ...
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ژورنال
عنوان ژورنال: Transactions of the Japan Institute of Metals
سال: 1979
ISSN: 0021-4434,2432-4701
DOI: 10.2320/matertrans1960.20.611