Quantum surface effects in the electromagnetic coupling between a quantum emitter and a plasmonic nanoantenna: time-dependent density functional theory vs. semiclassical Feibelman approach.

We use time-dependent density functional theory (TDDFT) within the jellium model to study the impact of quantum-mechanical effects on the self-interaction Green's function that governs the electromagnetic interaction between quantum emitters and plasmonic metallic nanoantennas. A semiclassical model based on the Feibelman parameters, which incorporates quantum surface-response corrections into an otherwise classical description, confirms surface-enabled Landau damping and the spill out of the induced charges as the dominant quantum mechanisms strongly affecting the nanoantenna-emitter interaction. These quantum effects produce a redshift and broadening of plasmonic resonances not present in classical theories that consider a local dielectric response of the metals. We show that the Feibelman approach correctly reproduces the nonlocal surface response obtained by full quantum TDDFT calculations for most nanoantenna-emitter configurations. However, when the emitter is located in very close proximity to the nanoantenna surface, we show that the standard Feibelman approach fails, requiring an implementation that explicitly accounts for the nonlocality of the surface response in the direction parallel to the surface. Our study thus provides a fundamental description of the electromagnetic coupling between plasmonic nanoantennas and quantum emitters at the nanoscale.

Morbilidad por traumatismo abdominal en niños 0-14 años; hospital Dr. Robert Read Cabral, 1981-1986

Con el propósito de determinar el comportamiento del traumatismo abdominal en el hospital de niños Robert Read Cabral, se sometieron a estudio los expedientes clínicos de los pacientes que fueron hospitalizados entre 1981 y 1986 y que tuvieron diagnóstico de traumatismo abdominal. Se revisaron 102 casos y se encontró que el traumatismo abdominal predominó en el sexo masculino en las edades comprendidas entre 5-10 años, el tipo más frecuente de trauma abdominal fue el no penetrante. Los órganos más afectados fueron el bazo, intestino delgado y riñon. Igualmente, se identificó que los traumas son más frecuentes durante el invierno y que su ocurrencia ha ido en ascenso durante el período en estudio