We report the results of an experimental study of thermal and magnetic properties of nanostructured ferrimagnetic iron oxide composites with graphene and graphite fillers synthesized via the current activated pressure assisted densification. The thermal conductivity was measured using the laser-flash and transient plane source techniques. It was demonstrated that addition of 5 wt. % of equal mixture of graphene and graphite flakes to the composite results in a factor of ×2.6 enhancement of the thermal conductivity without significant degradation of the saturation magnetization.The microscopy and spectroscopic characterization reveal that sp 2 carbon fillers preserve their crystal structure and morphology during the composite processing. The strong increase in the thermal conductivity was attributed to the excellent phonon heat conduction properties of graphene and graphite.The results are important for energy and electronic applications of the nanostructured permanent magnets. management 3 | P a g e

Abstract:We report results of experimental investigation of temperature rise in concentrated multi-junction photovoltaic solar cells with graphene-enhanced thermal interface materials. Graphene and few-layer graphene fillers, produced by a scalable environmentally-friendly liquid-phase exfoliation technique, were incorporated into conventional thermal interface materials. Graphene-enhanced thermal interface materials have been applied between a solar cell and heat sink to improve heat dissipation. The performance of the multi-junction solar cells has been tested using an industry-standard solar simulator under a light concentration of up to 2000 suns. It was found that the application of graphene-enhanced thermal interface materials allows one to reduce the solar cell temperature and increase the open-circuit voltage. We demonstrated that the use of graphene helps in recovering a significant amount of the power loss due to solar cell overheating. The obtained results are important for the development of new technologies for thermal management of concentrated photovoltaic solar cells.

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El análisis espacial en la actualidad es muy usado para obtener información nueva y tomar decisiones informadas. Diversas organizaciones utilizan el análisis espacial para su trabajo, yendo desde los gobiernos locales y nacionales, empresas privadas, universidades, organizaciones no gubernamentales. El campo de la salud no es ajeno a este aspecto, y en los últimos años está haciendo uso de estas herramientas para el análisis de las enfermedades o daños y sus tendencias en el tiempo y espacio. El Zika es una enfermedad infecciosa causada por el virus Zika (ZIKV). Se transmite por la picadura del zancudo Aedes aegypti, vector transmisor del dengue y chikungunya. La Región Tumbes ha notificado casos autóctonos de Zika desde el año 2016. Las necesidades que plantea la infección por virus Zika son de gran alcance y requieren un abordaje urgente, por lo que el uso del análisis geoespacial en el análisis epidemiológico de la situación de salud en la Región Tumbes resulta de utilidad y ha permitido en base a la información estadística del Zika en la Región Tumbes presentar la información de manera clara en gráficos de mapas de casos y tendencias. El análisis resultante permite ubicar las zonas de mayor riesgo y orientar las estrategias intervenir en su control.

The increase in the temperature of photovoltaic (PV) solar cells affects negatively their power conversion efficiency and decreases their lifetime. The negative effects are particularly pronounced in concentrator solar cells. Therefore, it is crucial to limit the PV cell temperature by effectively removing the excess heat. Conventional thermal phase change materials (PCMs) and thermal interface materials (TIMs) do not possess the thermal conductivity values sufficient for thermal management of the next generation of PV cells. In this paper, we report the results of investigation of the increased efficiency of PV cells with the use of graphene-enhanced TIMs. Graphene reveals the highest values of the intrinsic thermal conductivity. It was also shown that the thermal conductivity of composites can be increased via utilization of graphene fillers. We prepared TIMs with up to 6% of graphene designed specifically for PV cell application. The solar cells were tested using the solar simulation module. It was found that the drop in the output voltage of the solar panel under two-sun concentrated illumination can be reduced from 19% to 6% when graphene-enhanced TIMs are used. The proposed method can recover up to 75% of the power loss in solar cells.