In this article we present infinitely many 3–manifolds admitting infinitely many universally tight contact structures each with trivial Ozsváth–Szabó contact invariants. By known properties of these invariants the contact structures constructed in this article are non weakly symplectically fillable.

The dynamical evolution of protoplanetary disks is key interest for building a comprehensive theory planet formation and to explain the observational properties these objects. Using magnetohydrodynamics code Athena++, with an isothermal shearing box setup, we study boundary between active dead zone, where accretion rate changes mass can accumulate. We quantify how turbulence level affected by p...

Good ohmic contacts with low contact resistance, smooth surface morphology, and a well-defined edge profile are essential to ensure optimal device performances for the AlGaN/GaN high electron mobility transistors [HEMTs]. A tantalum [Ta] metal layer and an SiNx thin film were used for the first time as an effective diffusion barrier and encapsulation layer in the standard Ti/Al/metal/Au ohmic m...

I describe work on two aspects of magnetic field evolution relevant for the “recycling” scenario for making millisecond radio pulsars. First, many of the theoretical ideas for bringing about accretion-induced field decay rely on dissipation of currents in the neutron star crust. I discuss field evolution in the crust due to the Hall effect, and outline when it dominates Ohmic decay. This emphas...

This article looks at the Soret and Dufour effects on the magnetohydrodynamic (MHD) peristaltic flow of variable viscosity fluid in a symmetric channel. Analysis is presented in the presence of Ohmic heating. Results for the stream function, temperature and concentration are constructed. The variations of sundry parameters are analyzed.

Abstract The seven planets orbiting TRAPPIST-1 have sizes and masses similar to Earth mean densities that suggest their interior structures are comprised of a fluid iron core rocky mantle. Here we use idealized analytical models compute estimates the viscous dissipation in cores induced by mantle libration precession. at orbital periods is largest for TRAPPIST-1b, order 600 MW, decreases with d...

The standard weak-coupling approximations associated to open quantum systems have been extensively used in the description of a two-level system, qubit, subjected relatively weak dissipation compared with qubit frequency. However, recent progress experimental implementations controlled increased levels on-demand engineered has motivated precision studies parameter regimes that question validity...

hydraulics of stepped spillway is a very complicated phenomenon, as it consists of a two phase flow passing through a set of designed steps. the steps increase the rate of energy dissipation taking place on the spillway face. turbulence, flow aeration and energy dissipation are the main tasks in the design of such structures. this study consists of the experimental investigation to determine th...