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Optical polarized properties related to the oxygen vacancy defect in the PbW04 crystal

Chinese Physics B 2005年第6期14卷 1142-1146页

作者：刘廷禹张启仁庄松林 universityofshanghai/orScienceandTechnology Shanghai200093China

The electronic structures, dielectric functions, complex refractive index and absorption spectra for the PbWO4 (PWO) crystal with and without oxygen vacancy V2O2+ have been calculated using the full-potential (linearized) augmented planewave (FP-LAPW)+local orbitals (LO) method with the lattice structure optimized. The calculated results indicate that the optical properties of the PWO crystal show anisotropy and its optical symmetry coincides with the lattice structure geometry of the PWO crystal. The calculated absorption spectra indicate that the stoichiometric PWO crystal does not display absorption band in the visible and near-ultraviolet range. However, in this range, the absorption spectra of the PWO crystal containing VO2+ exhibit two peaks at 3.35eV (370nm) and 2.95eV (420nm), respectively. It is revealed that the 350nm and 420nm absorption bands are related to the existence of VO2+ in the PWO crystal.

关键词： PbWO4 crystal electronic structure optical properties oxygen vacancy

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SOME PHYSICAL ASPECTS OF ADOLESCENCE IN CHINESE STUDENTS

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中华医学杂志(英文版) 1934年第1期048卷 37-46页

作者： C.HART WESTBROOK DANIELG.LAI SIDNEY D.HSIAO universityofshanghai NationalMedicalCollegeofShanghai andCentralChinaUniversity respectively. universityofshanghai NationalMedicalCollegeofShanghai andCentralChinaUniversity respectively. universityofshanghai NationalMedicalCollegeofShanghai andCentralChinaUniversity respectively.

*** view of physiological and educational importance,throughquestionnaires and medical examinations,we attempted to study theadolescence of 1,000 boys and 336 girls in schools at Shanghai and *** four standard criteria of adolescence adopted for boys werethe presence of 1)pubic hairs and 2)axillary hairs,3) change of voice,and 4)night emissions;for girls,1)pubic hairs,2)axillary hairs,3)mammary development,and 4)first *** means for the four signs of puberty in boys were:1)firstemission,age 15.48±0.03 years;2)first pubic hairs,age 15.24±0.03;3) first axillary hairs,age 16.01+0.04,and 4)first signs of change ofvoice,age 15.2±*** means for the four signs of puberty in girls were:1)firstmenstruation,age 13.56±0.05 years;2)first signs of enlargement ofbreasts noted,age 13.56±0.07,3)first pubic hairs,age 14.83±0.16,and 4) first axillary hairs,age 15.33±*** the group of 665 school boys examined,pre-pubescents werefound extending over 8 years,at II years 100 per cent being pre-pubes-cent,and at 18 years,1.2 per cent;the age of pubescents ranged from12 to 19 years;and of post-pubescents,from 13 to 20 years.

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