This paper presents the Zero-Voltage Switching (ZVS) performance of Dual Active Bridge (DAB) DC-DC converter for high power density aerospace applications. Switching transitions of the transistor occurring in favorable conditions such as device zero-voltage or zero-current is called as soft-switching. The benefits of soft-switching are reduced switching losses, switch stress, low electromagneti...

RESUMEN Este estudio pretende develar contradicciones en el cuidado humanizado del enfermero en la UCI. Se trata de una investigación cualitativa, de orientación dialéctica, realizada con siete enfermeros, cuatro familiares y un paciente en una UCI de Adultos de un Hospital Universitario del Estado de Santa Catarina. Utilizamos la observación participativa y la entrevista semi-estructurada. El ...

Infrared radiative cooling of the thermosphere by carbon dioxide (CO2, 15 µm) and by nitric oxide (NO, 5.3 µm) has been observed for 12 years by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics satellite. For the first time we present a record of the two most important thermospheric infrared c...

Assimilation of stratospheric and mesospheric temperatures from MLS and SABER into a global NWP model K. W. Hoppel, N. L. Baker, L. Coy, S. D. Eckermann, J. P. McCormack, G. E. Nedoluha, and D. E. Siskind Naval Research Laboratory, Washington, WA, USA Naval Research Laboratory, Monterey, CA, USA Received: 17 March 2008 – Accepted: 7 April 2008 – Published: 7 May 2008 Correspondence to: K. Hoppe...

A mobile Rayleigh temperature lidar was deployed in Golmud (36.25°N 94.54°E), Qinghai in China for making measurements of mesosphere temperature from 55 up to 90 km. The mesospheric thermal structure was obtained during the winter seasons of Year 2013 and Year 2014. At the altitude of 57~79 km, lidar temperatures were much colder than the MSIS-00 model predictions. However, in the lower mesosph...

This paper presents complete behavioral analysis of a surface micro-machined MEMS varactor for frequency tuning application in voltage controlled oscillators in RF applications with high Quality factor and tunability. The dimensions of the MEMS device have been optimized with Finite Element Method based CoventorWare analysis and verified through lumped parameter analysis in Saber platform. The ...