Simulation of Static and Dynamic Properties of Edge-Emitting Multi Quantum Well Lasers

Edited b

Simulation of Static and Dynamic Properties of Edge-Emitting Multi Quantum Well Lasers

This paper demonstrates simulation tools for edge-emitting multi quantum well (MQW) lasers. Properties o

Existence and Uniqueness Results for Equations Modelling Transport of Dopants in Semiconductors

. This paper is devoted to the analytical investigation of some nonlinear reaction--diffusion system modelling the transport of dopants in semiconductors. Estimates by the energy functional and L 1 --estimates obtained by a modified De Giorgi method imply global existence and uniqueness as well as results concerning the asymptotic behaviour. 1. Transport of dopants in semiconductors Modelling the transport of dopant impurities in semiconducting materials is of great interest, both for scientific and technological reasons. It may be rather surprising that given the significance of that phenomenon there exists neither a generally accepted physical model nor a comprehensive mathematical analysis of the various model equations. There have been developed different models from a chemical kinetics viewpoint (see e.g. [5, 14, 15, 17]). More or less simplified models have been used for engineering analysis and computer aided simulation (see e.g. [9, 11, 12, 16]). This paper is devoted to t..

Acute and Long-Term Hemodynamic Effects of MitraClip Implantation on a Preexisting Secondary Right Heart Failure

Positive results of MitraClip in terms of improvement in clinical and left ventricular parameters have been described in detail. However, long-term effects on secondary pulmonary hypertension were not investigated in a larger patient cohort to date. 70 patients with severe mitral regurgitation, additional pulmonary hypertension, and right heart failure as a result of left heart disease were treated in the heart centers Hamburg and Göttingen. Immediately after successful MitraClip implantation, a reduction of the RVOT diameter from 3.52 cm to 3.44 cm was observed reaching a statistically significant value of 3.39 cm after 12 months. In contrast, there was a significant reduction in the velocity of the tricuspid regurgitation (TR) from 4.17 m/s to 3.11 m/s, the gradient of the TR from 48.5 mmHg to 39.3 mmHg, and the systolic pulmonary artery pressure (PAPsyst) from 58.6 mmHg to 50.0 mmHg. This decline continued in the following months (Vmax TR 3.09 m/s, peak TR 38.6 mmHg, and PAPsyst 47.4 mmHg). The tricuspid annular plane systolic excursion (TAPSE) increased from 16.5 mm to 18.9 mm after 12 months. MitraClip implantation improves pulmonary artery pressure, tricuspid regurgitation, and TAPSE after 12 months. At the same time, there is a decrease in the RVOT diameter without significant changes in other right ventricular and right atrial dimensions

A boundary multivalued integral “equation” approach to the semipermeability problem

summary:The present paper concerns the problem of the flow through a semipermeable membrane of infinite thickness. The semipermeability boundary conditions are first considered to be monotone; these relations are therefore derived by convex superpotentials being in general nondifferentiable and nonfinite, and lead via a suitable application of the saddlepoint technique to the formulation of a multivalued boundary integral equation. The latter is equivalent to a boundary minimization problem with a small number of unknowns. The extension of the present theory to more general nonmonotone semipermeability conditions is also studied. Int the last section the theory is illustrated by two numerical examples

Characterization of Symmetry Properties of Pt(111) Electron Bands by Means of Angle-, Energy-, and Spin-Resolved Photoemission with Circularly Polarized Synchrotron Radiation

Eyers A, Schäfers F, Schönhense G, et al. Characterization of Symmetry Properties of Pt(111) Electron Bands by Means of Angle-, Energy-, and Spin-Resolved Photoemission with Circularly Polarized Synchrotron Radiation. Physical review letters. 1984;52(17):1559-1562.An angle-, energy-, and spin-resolved photoemission experiment has been performed for Pt(111) with the circularly polarized synchrotron radiation of the new German dedicated storage ring BESSY. The photoelectron polarization measured as function of the kinetic energy at different photon energies between 6.5 and 24 eV for normal incidence and normal emission shows a pronounced spectral variation up to +/-55%. The electron intensities and polarizations observed allow a symmetry-resolved band characterization of Pt in the [Gamma]-L direction