نتایج جستجو برای: tunnelling
تعداد نتایج: 4451 فیلتر نتایج به سال:
BACKGROUND Catheter-related infections are a serious complication of continuous thoracic epidural analgesia. Tunnelling catheters subcutaneously may reduce infection risk. We thus tested the hypothesis that tunnelling of thoracic epidural catheters is associated with a lower risk of catheter-related infections. METHODS Twenty-two thousand, four hundred and eleven surgical patients with contin...
Many ant species excavate nests that are made up of chambers and interconnecting tunnels. There is a general trend of an increase in nest complexity with increasing population size. This complexity reflects a higher ramification and anastomosis of tunnels that can be estimated by the meshedness coefficient of the tunnelling networks. It has long been observed that meshedness increases with colo...
The early papers by Klein, Sauter and Hund which investigate scattering off a high step potential in the context of the Dirac equation are discussed to derive the ’paradox’ first obtained by Klein. The explanation of this effect in terms of electron-positron production is reassessed. It is shown that a potential well or barrier in the Dirac equation can become supercritical and emit positrons o...
Dynamics of a low-density exciton system is simulated using the kinetic Monte Carlo algorithm. The temperature dependences photoluminescence (PL) intensity and PL band Stokes shift in high-Al-content AlGaN epilayer are calculated fitted to experimentally measured ones. key features nonradiative recombination via delocalized states direct tunnelling centres their influence on efficiency analyse...
We study, analytically and numerically, the dynamics of interband transitions in two-dimensional hexagonal periodic photonic lattices. We develop an analytical approach employing the Bragg resonances of different types and derive the effective multi-level models of the Landau-Zener-Majorana type. For two-dimensional periodic potentials without a tilt, we demonstrate the possibility of the Rabi ...
We report a multi tunnelling junction characteristic in P-type porous silicon core coated with thin film platinum silicide. Detailed analysis of electron transport in this device admits the existence of a structure like a twodimensional Multi Tunnelling Junctions (2D-MTJ) clearly originate from the sharp edge of created platinum silicide on porous surface. Furthermore, using SIMON simulator, el...
We discuss the possibility of deciding on the symmetry of the superconducting phase in the organic superconductors (Bechgaard salts), using tunnelling experiments. We first briefly review the properties of organic superconductors, and the possibility to have unconventional (triplet) superconductivity in these systems. We then present a simple scheme for computing the full current-voltage charac...
Nowadays, most communication networks such as local area networks (LANs), metropolitan area networks (MANs), and wide area networks (WANs) have replaced or are about to replace coaxial cable or twisted copper wire with fiber optical cables. Light-wave communication systems comprise a transmitter based on a visible or near-infrared light source, whose carrier is modulated by the information sign...
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