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  • 1
    ISSN: 1432-0630
    Keywords: 78.70.Bj ; 72.80.Ey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The positron lifetime of undoped Liquid-Encapsulated Czochralski (LEC)-GaAs and Si-doped (1.3×1018 cm−3) LEC-GaAs was measured before and after irradiation with protons (dose 1×1015/cm2, 15 MeV). In Si-doped GaAs, the decrease of positron lifetime at temperatures between 10 and 300 K are due to the decrease of the positron-diffusion length and the increase of the effective shallow traps such as antisite GaAs. The annealing stage of the proton-irradiation-induced defects which show the different behavior from that of electron-irradiation-induced defects suggests that proton irradiation creates more complicated defect complexes, containing vacancies rather than isolated vacancy-type defects or simple complexes which have been observed during electron-irradiation processes. Above 700 K, proton-irradiation-induced defects such as vacancy-type defects and simple vacancy complexes are almost annealed out, while Si-induced defects such as SiGa-VGa complexes cannot be annealed out above 973 K.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0584
    Keywords: Key words Multiple myeloma ; Prognostic factor ; Morphology ; Elderly ; Young
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The prognostic value of morphological classifications and clinical variables was compared between 31 elderly (≥65 years) and 43 young (〈65 years) patients with myeloma. Prognostic factors were divided into three groups: factors useful in elderly patients, e.g., calcium, albumin; factors useful in young patients, e.g., platelet, creatinine, light-chain type; and factors useful in both patients, e.g., clinical stage, hemoglobin, LDH, CRP, bone marrow plasma cell and plasmablast percentages, light- and electron-microscopic classifications. The 5-year survival rates of elderly patients with calcium 〈12 and ≥12 mg/dl were 66.2 and 〈11.1%, respectively (p〈0.01). Those of the young patients were 64.1 and 33.3%, respectively. The 5-year survival rates of elderly patients with platelets ≥200×109/l and 〈100×109/l were 59.7 and 50.0%, respectively. Those of the young patients were 68.9 and 33.3%, respectively (p〈0.05). The 5-year survival rates of elderly patients with few and numerous electron-microscopic abnormalities were 90 and 0%, respectively (p〈0.01), those of young patients were 92.9 and 〈14.3%, respectively (p〈0.01). These findings suggest that individual clinical variables may differ in prognostic importance in elderly and young patients.
    Type of Medium: Electronic Resource
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