“We investigated parallel arrays of superconducting Nb/AlO(x)/Nb tunnel junctions nonevenly distributed in a superconducting Nb/SiO/Nb microstrip transmission line. Such devices are discretized Josephson transmission lines (DJTLs) in which, from theory, magnetic flux quanta (“”fluxons”") can travel as solitonic waves when a dc current bias and a dc magnetic field are applied. We observed a reproducible series of resonant branches in each device’s I-V curve, at Josephson submillimeter-wave
frequencies (from 240 to 720 GHz) matching the resonances predicted using a transmission line analysis, where the loading of the N=5 junctions is fully taken into account. The nonperiodic distribution was optimized to provide rf matching over GF120918 a large bandwidth (450-650 GHz typically), implying that the plasma resonance of junctions is inductively tuned out over a similar band www.selleckchem.com/products/poziotinib-hm781-36b.html by the array. A confirmation of this comes from the observation, at frequencies higher than the untuned junctions plasma frequency, of several Josephson phenomena reported
in this article: Fiske-like resonances, phase-locking of the n=3 resonance to an external 600 GHz microwave source, rf-induced zero crossing, and resonances at fractional harmonics of the rf signal. These experimental results are all compatible with a fluxon-based resonances interpretation, as in the extensively studied long Josephson junctions yet at higher frequencies. As reported elsewhere, we could detect similar to 500 GHz microwave radiation emitted by our devices in the n=1 and n=3 modes. In light
of these unique properties, we propose nonuniform DJTLs as a promising type of Josephson device for submillimeter-wave oscillators and fast fluxon-based electronics.”
“A copolymer, poly(L-lactide)-g-poly(N-vinyl pyrrolidone) (PLLA-g-PVP) was prepared with poly(L-lactide) (PLLA) and N-vinyl pyrrolidone in the presence of methanol as a solvent by gamma-ray irradiation. The structure of PLLA-g-PVP was characterized by (1)H-NMR and Fourier transform infrared spectroscopy. The PLLA-g-PVP graft ratio calculated by the percentage increase in weight increased with the increase of absorbed dose, and the percentage JQ1 crystallinity of PLLA-g-PVP decreased with increasing graft ratio. The introduction of the poly(N-vinyl pyrrolidone) chain into PLLA resulted in a decrease in the contact angle of PLLA-g-PVP with increasing graft ratio. In vitro degradation testing showed that PLLA-g-PVP had a higher degradation rate both in the weight-loss test and molecular weight measurement because of a lower crystalline percentage and higher hydrophilicity compared to PLLA. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 114: 3152-3157,2009″
“Objective To determine an effective mode of therapy of ingrown nail using two different methods.