The subband structures, distributions of electron and hole wave functions, state density, optical gain spectra, and transparency carrier density of the V-groove Zn 1-x Cd x Se/ZnSe quantum wires are investigated theor...The subband structures, distributions of electron and hole wave functions, state density, optical gain spectra, and transparency carrier density of the V-groove Zn 1-x Cd x Se/ZnSe quantum wires are investigated theoretically using four band effective-mass Hamiltonian, which takes into account the effects of the valence band anisotropy and the band mixing. The biaxial strain effect for quantum wires is included in the calculation. The compressive strain in the Zn 1-x Cd x Se wire region increases the energy separation between the uppermost subbands. The optical gain with xy -polarized light is enhanced, while optical gain with z -polarized light is strongly decreased. The xy -polarized optical gain spectrum has a peak at around 2.541 eV, with the transparency carrier density of 0.75×10 18 cm -3 . The calculated results also show that the strain tends to increase the quantum confinement and enhance the anisotropy of the optical transitions.展开更多
BACKGROUND: Before introducing the transobturator tape into our practice we undertook 52 transobturator tape procedures. The transobturator tape procedures were undertaken with an “outside-in”approach, using nonwove...BACKGROUND: Before introducing the transobturator tape into our practice we undertook 52 transobturator tape procedures. The transobturator tape procedures were undertaken with an “outside-in”approach, using nonwoven polypropylene mesh with average pore size of 50 μm. CASES: Five cases of vaginal erosions have been identified, 1 complicated by a groin abscess. All cases required further procedures to trim(n=3), resect(n=1) or remove(n=1) the tape. One woman had a tension-free vaginal tape procedure. To date, 3 women remain incontinent. CONCLUSION: Possible reasons for the complications in-clude 1) surgical inexperience(unlikely, given that we have undertaken more than 2000 tension-free vaginal tape procedures without similar complication rates); 2) inherent susceptibility of the “hammock”position of the transobturator tape; or 3) the nonwoven polypropylene tape with mesh size of 50 μm itself may predispose to erosion or abscess.展开更多
文摘The subband structures, distributions of electron and hole wave functions, state density, optical gain spectra, and transparency carrier density of the V-groove Zn 1-x Cd x Se/ZnSe quantum wires are investigated theoretically using four band effective-mass Hamiltonian, which takes into account the effects of the valence band anisotropy and the band mixing. The biaxial strain effect for quantum wires is included in the calculation. The compressive strain in the Zn 1-x Cd x Se wire region increases the energy separation between the uppermost subbands. The optical gain with xy -polarized light is enhanced, while optical gain with z -polarized light is strongly decreased. The xy -polarized optical gain spectrum has a peak at around 2.541 eV, with the transparency carrier density of 0.75×10 18 cm -3 . The calculated results also show that the strain tends to increase the quantum confinement and enhance the anisotropy of the optical transitions.
文摘BACKGROUND: Before introducing the transobturator tape into our practice we undertook 52 transobturator tape procedures. The transobturator tape procedures were undertaken with an “outside-in”approach, using nonwoven polypropylene mesh with average pore size of 50 μm. CASES: Five cases of vaginal erosions have been identified, 1 complicated by a groin abscess. All cases required further procedures to trim(n=3), resect(n=1) or remove(n=1) the tape. One woman had a tension-free vaginal tape procedure. To date, 3 women remain incontinent. CONCLUSION: Possible reasons for the complications in-clude 1) surgical inexperience(unlikely, given that we have undertaken more than 2000 tension-free vaginal tape procedures without similar complication rates); 2) inherent susceptibility of the “hammock”position of the transobturator tape; or 3) the nonwoven polypropylene tape with mesh size of 50 μm itself may predispose to erosion or abscess.
