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The Datta-Das-type spin field-effect transistor, using a two-dimensional electron gas in a semiconductor heterostructure as a channel, plays a key role in spintronics. Here, we theoretically present a type of spin field-effect transistor based on massless birefringent Dirac fermions in polar Dirac semimetals. The manipulation of spin arises from the existence of the strong spin-orbit coupling, polar space groups, and Dirac cones in a single phase. The oscillatory channel conductance can be controlled by the sign of gate voltage in addition to its magnitude due to the gapless band structures of polar Dirac semimetals. Such spin field-effect transistor provides guidance for the further design of spintronic devices., Comment: 14 pages, 3 figures

The effects of different microstructure on the dynamical stab-resistant property of TA15 alloy are investigated. The specimens were tested on the stab apparatus after heat treatment at temperature of 850, 930 and 1030°C, time of 30min and air cooled. The impact force-time curves, microstructure and fracture morphology of specimens were analyzed. The results showed that the properties of higher strength and plasticity are benefit to the performance of stab resistance of TA15 specimens, and the curves of 930°C and 850°C exhibit two peaks and longer time ranges, but the curve of 1030°C exhibits the shortest time to reach the peak of impact force, and the specimens heat treated at 850°C exhibit the better performance against the knife impactor because of fine grain and stronger grain boundary binding force to absorb the impact force energy.

2016 International Nanotoxicology Congress in Boston, Massachusetts. This research was supported in part through IHSFC funding to Professor Subhash Risbud, Professor of Material Sciences in the College of Engineering, UC Davis. Center grant support is acknowledged on the poster.

The hot deformation behavior of Ti53311S titanium alloy in the temperature range of 880–1080 °C and strain rate range of 0.001-10 s −1 have been studied by hot compressive testing on a Gleeble-1500 simulator. The flow behavior was described by the hyperbolic sine constitutive equation, the activation energies in (α+ β ) region and in β region were calculated as 641 kJ/mol and 244 kJ/mol, respectively. The microstructure of Ti53311S was observed and analyzed using an optical microscope. The experimental results show that this alloy is sensitive to deformation temperature and strain rate, and the strain rate sensitivity exponent values ( m ) decreases with increasing of deformation temperature while the deformation activation energy ( Q ) increases. The leading deformation mechanism in the single phase β region is dynamic recover, while that in (α+ β ) region is grain boundary slipping and grain globularizing.