The cross-plane thermoelectric performance of strained Si/Ge/Si superlattices is studied from a quantum point of view using the nonequilibrium Green’s function method. Strain causes the germanium well layers to turn into barriers that promote electron tunneling through the barriers. Electron tunneling produces oscillations in the Seebeck coefficient due to shift in subband energies near the Fer...

We investigate the influence of slab thickness on the electronic structure of the Si(1 0 0)- p([Formula: see text]) surface in density functional theory (DFT) calculations, considering both density of states and band structure. Our calculations, with slab thicknesses of up to 78 atomic layers, reveal that the slab thickness profoundly affects the surface band structure, particularly the danglin...

Crystalline S(urface)-layers are the most commonly observed cell surface structures in prokaryotic organisms (bacteria and archaea). S-layers are highly porous protein meshworks with unit cell sizes in the range of 3 to 30 nm, and thicknesses of ~10 nm. One of the key features of S-layer proteins is their intrinsic capability to form self-assembled mono- or double layers in solution, and at i...

The prime requirements for the spin transfer torque based ferromagnetic (FM)/nonmagnetic (NM) bilayer spin devices are (i) the absence of two-magnon scattering (TMS) noise, (ii) minimum energy dissipation and (iii) fast switching. To realize these objectives we have studied the thickness, Py (permalloy) thicknesses (tPy) and b-Ta thicknesses (tTa), dependent magnetization dynamics behaviour of ...

Grain-size distributions and thicknesses of tephra layers are used to reconstruct characteristics, dynamics, hazards explosive volcanic eruptions, but the extent which preservation is influenced by depositional environments unclear. This paper analyses grain-size produced Eyjafjallajökull (2010) Grímsvötn (2011) eruptions. We collected 110 samples layer thickness measurements from 86 sites at t...

This work presents comparisons between numerical simulations and secondary electron emission yield measurements. The impact on the of a growing graphite layer deposited copper substrates is analyzed. confirm experimental observations showing that very thin coating deposit, with thickness few nm, can affect significantly an irradiated material. Beyond 5 nm thickness, surface material alone drive...

Lenses made of negative index materials have the ability to focus the propagating and evanescent components of electromagnetic waves. Such a possibility enables super resolution, in turn resulting in sharper, subwavelength size images. In this present work, we present subwavelength imaging that was obtained from a one-dimensional left-handed metamaterial (LHM) composed of alternating layers of ...

Results of recent experimental measurements of the effect of passive boundary layer flow control method using Large-Eddy Break-Up devices on aero-optical distortions caused by turbulent subsonic boundary layers at a range of trans-sonic speeds are presented. Measurements were performed using a Malley probe to collect instantaneous onedimensional wavefronts with high resolution. Detailed statist...

Ultrathin layers of polypyrrole (PPy) were electrochemically grown between microelectrodes on a Si/SiO(2) substrate. Conducting nanolayers of PPy are directly grown onto ultrathin discontinuous gold (Au) film between the microelectrodes, with thicknesses in the range 10-100 nm. The system therefore forms a novel (PPy/Au) nanocomposite conductor. Atomic force microscopy (AFM) imaging and conduct...

High quality gallium nitride (GaN) thin films have been grown on 6H-silicon carbide (0001) substrates at varying substrate temperatures using molecular beam epitaxy and characterized at low and high film thicknesses. The epitaxial layers show two regimes in temperature distinguishable by different morphology. For film thicknesses around the critical thickness, low temperature growth is two dime...