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Different magnetic and magnetotransport properties of a hexagonal Ni2In-type MnCo0.8V0.2Ge magnetic shape memory alloy are investigated. The parent MnCoGe alloy undergoes first order martensitic phase transition (MPT) at 650 K during cooling and orders ferromagnetically (FM) below 345 K. V-doping at the cobalt site decreases the MPT temperature and affects the lattice parameters that induces a short range antiferromagnetic (AFM) interaction in this intrinsically FM system at low temperature. The studied alloy shows three important magnetofunctional properties namely exchange bias effect, magnetocaloric effect, and magnetoresistance which indicate that the alloy may be a potential candidate for practical applications. [ABSTRACT FROM AUTHOR]

This paper deals with phase change materials (PCMs), used in conjunction with thermal conductivity enhancer (TCE), as means of thermal management of electronic systems. This work was motivated by the need for short term thermal management of high packing density equipments (such as in avionics). Eicosane is used as PCM, while aluminium pin or plate fins are used as TCE. The test section considered in all cases is 42×42 mm square base with TCE height of 25 mm. An electronic heater producing 4, 6 and 8 W was used to simulate the heat generation of electronic chips. Various volumetric percentages of TCE in the conglomerate of PCM and TCE were considered, namely, 0, 2, 8, 18 and 27%. The case with 8% volumetric percentage of TCE was found to have the best thermal performance. A numerical model was developed to enable interpretation of experimental results and to perform parametric studies. [ABSTRACT FROM AUTHOR]