RESUMEN
This paper discusses the use of nanomaterials for the improved performance of time-of-flight particle detectors based on secondary electron emission (SEE). The purpose of the research presented in this paper is to find a nanomaterial that has a higher SEE than gold. In this article, we present a measurement of the SEE properties from 1D (one-dimensional) nanostructures of ZnO and ZnO/GaN (ZnO with GaN coating) composed of a mostly regular pattern of nanotubes grown on a thin Si3N4 substrate. The study was performed with 4.77 meV/u Au beam. We observed an average increase of 2.5 in the SEE properties from the 1D ZnO nanotubes compared to gold.
RESUMEN
The neutron-rich nuclei 94,96Kr were studied via projectile Coulomb excitation at the REX-ISOLDE facility at CERN. Level energies of the first excited 2(+) states and their absolute E2 transition strengths to the ground state are determined and discussed in the context of the E(2(1)(+)) and B(E2;2(1)(+)â0(1)(+)) systematics of the krypton chain. Contrary to previously published results no sudden onset of deformation is observed. This experimental result is supported by a new proton-neutron interacting boson model calculation based on the constrained Hartree-Fock-Bogoliubov approach using the microscopic Gogny-D1M energy density functional.
RESUMEN
The disposition kinetics of ofloxacin, a quinolone antibacterial agent excreted essentially unmodified by the kidney, was studied after single oral administration in 8 patients with compensated liver cirrhosis and in 8 control subjects. Mean elimination half-life and apparent volume of distribution were significantly increased in the cirrhotic group (7.6 vs. 4.9 h and 1.6 vs. 1.2 liters kg-1, respectively). A reduction in the renal clearance of ofloxacin was also observed in the cirrhotic patients, in spite of an apparently normal renal function. These observations indicate that also the pharmacokinetics of unmetabolized drugs may be altered in compensated liver cirrhosis. The serum concentration-time profiles of nearly all subjects exhibited a secondary peak 4-6 h after dosing. This double-peak behavior was interpreted as either enterohepatic circulation or biphasic gastric emptying of ofloxacin.