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In this research, YBa2Cu3O7-d (0 < d < 1) nanocrystalite superconductor was prepared by mechanochemical alloying method. We synthesized YBa2Cu3O7-d via mixing the BaCO3, Y2O3, CuO powders and milling in SPEX 8000 for 5h with weight ratio of ball to powder 10:1 and steel balls of 11mm diameter, followed by heating for 4h at 850 ˚C. The superconductor phase formation process was completed with si...
We have searched for the charmless hadronic decay of B mesons into two neutral pions. Using 9.13 fb taken at the Υ(4S) with the CLEO detector, we obtain an improved upper limit for the branching fraction B(B → ππ) < 5.7 × 10 at the 90% confidence level.
OBJECTIVE To examine whether the recent increasing prevalence of obesity was accompanied by variations in energy and macronutrient intakes by weight status. DESIGN Time series of cross-sectional surveys. SETTING National Health and Nutrition Examination Surveys (NHANES) in the USA. SUBJECTS Adult participants of NHANES I (1971-1974), II (1976-1980), III (1988-1994) and continuous (1999-20...
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