Context. Polarization phase curves of asteroids and other small airless bodies are influenced by the compositional physical properties their regolith. The mixing minerals composing regolith influences negative polarization at angles because it changes multiple scattering medium. Aims. This work aims to demonstrate experimentally how effect curve for different mineralogies relevant asteroids, de...

Abstract AlGaN/GaN high electron mobility transistors (HEMTs) with different device sizes were prepared and exposed to 0.4 MeV proton irradiation. The low-field carrier transport characteristics of the gate channel are obtained from capacitance-voltage curves current-voltage curves. For a longer gate-drain distance (30 μm), after irradiation, gate-channel increases by 14.3% on average. shorter ...

To any pair of coverings fi : X → Xi, i = 1, 2 of smooth projective curves one can associate an abelian subvariety of the Jacobian JX , the Prym variety P (f1, f2) of the pair (f1, f2). In some cases we can compute the type of the restriction of the canonical principal polarization of JX . We obtain 2 families of Prym-Tyurin varieties of exponent 6.

High density sodium lithium niobate lead free ceramics near the morphtropic phase boundary [NaxLi1−xNbO3, (LNN), x=0.12] were prepared by the solid state reaction method. XRD patterns showed that the lattice structures were changed after polarization. The temperature dependence of the dielectric constant and dielectric loss, pyroelectric coefficient and DSC curves of LNN ceramics showed that th...

New stack for proton exchange membrane fuel cells (PEMFCs) has been developed to improve the performance of PEMFCs under nonumidifying condition by supplying reactant in series. The electromagnetic pump was used in the circulation pipeline to enhance the flow rate of eactants and thus to reduce the uneven distribution of water. Performance of the new stack was studied by using polarization curv...

Solid oxide cells (SOCs) are high temperature energy-conversion devices, which have attracted a growing interest in the recent years. Indeed, this technology presents efficiency and good reversibility fuel cell (SOFC) electrolysis (SOEC) modes. Nevertheless, SOCs durability is still insufficient due to performance degradation during operation. In context, physics-based model has been proposed i...