Temperature Dynamics in Rat Brains Exposed to Near-Field Waveguide Outputs at 2.8 GHz.

Biological effects in the microwave band of the radiofrequency (RF) spectrum are thermally mediated. For acute high-power microwave exposures, these effects will depend on transient time-temperature histories within the tissue. In this article, we summarize the transient temperature response of rats exposed to RF energy emanating from an open-ended rectangular waveguide. These exposures produced specific absorption rates of approximately 36 and 203 W/kg in the whole body and brain, respectively. We then use the experimentally measured thermal data to infer the baseline perfusion rate in the brain and modify a custom thermal modeling tool based upon these findings. Finally, we compare multi-physics simulations of rat brain temperature against empirical measurements in both live and euthanized subjects and find close agreement between model and experimentation. This research revealed that baseline brain perfusion rates in rat subjects could be larger than previously assumed in the RF thermal modeling literature, and plays a significant role in the transient thermal response to high-power microwave exposures. © 2021 Bioelectromagnetics Society.

Aula virtual para el aprendizaje sobre redes informáticas. Municipio Yara, 2013 / Virtual classroom for the learning of computer networks. Yara, 2013

Se realizó una investigación aplicada con el propósito de implementar un entorno virtual de enseñanza - aprendizaje como aula virtual para el aprendizaje sobre redes informáticas en la Filial Universitaria Municipal: Policlínico Luis E de la Paz Reina del municipio Yara. Para la realización de este trabajo se utilizaron métodos científicos, entre los teóricos se encuentran el análisis –síntesis, inducción –deducción y sistémico-estructural funcional. El universo estuvo representado por 15 estudiantes en el período 2013. Entre los empíricos: observación y experimento. Se diseñó el entorno virtual de manera exitosa quedando definida la interfaz gráfica con sitiosy aplicaciones visuales atractivas, que superaron todas las expectativas, el cual fue implementado como aula virtual en dicha filial y se valoró su factibilidad en la práctica social(AU)

It was carried out an investigation with the purpose of implementing a virtual environment of the teaching -learning process like a virtual classroom for the learning of computer networks in the Municipal University Branch: Luis E de la Paz Reina in Yara. For the performance of this work there were used some scientific methods, among the theoretical ones we applied the analysis -synthesis, induction - deduction and systemic-structural functional. The universe was represented by 15 students in the period 2013. Among the empiricalones we applied the observation and experiment. It was designed the virtual environment in a successful way being defined the graphic interfacewith sites and attractive visual applications that overcame all the expectations, it was implemented as a virtual classroom in this branch and its feasibility was valued in the social practice(AU)