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Computational study of noise generation and propagation from a wind turbine

The flow and acoustic fields around a wind turbine are computed using a hybrid method. The flow computations reveal the presence of large-scale structures which are convected downstream without significant decay. The strong interaction between the tip vortices and the wind turbine tower is highlighted. The acoustic computations show that the resulting acoustic near-field is dominated by the bla

Phase noise reduction in RF CMOS VCO's via capacitive filtering

This paper presents the experimental results of two different techniques, the already known inductive degeneration technique and the new capacitive filtering technique, for reducing the phase noise in RF CMOS VCO's. The techniques are applied to two distinct VCO designs, showing that the largest phase noise reduction (up to 7 dB at 3 MHz offset frequency from the carrier) is achieved via inductive

Numerical Simulation of Fluid Flow in a Monolithic Exchanger Related to High Temperature and High Pressure Operating Conditions

The purpose of this work is the enhancement of performance by a new design of monolithic heat exchangers under steady-state operating conditions. Heat transfer phenomena and hydrodynamics have been studied and visualized by computational fluid dynamics (CFD). Further, a simple gas distribution system has been analyzed in purpose to find best performance of the exchanger. To achieve this, 3D simula

Minimization of the chromatic dispersion over a broad wavelength range in a single-mode optical fiber

The effective refractive-index as a function of vacuum wavelength is approximated by Lagrange interpolation polynomials. The root-mean-square value of the chromatic dispersion is then calculated analytically. It is demonstrated that use of fourth degree polynomials is far more efficient than use of second degree polynomials. The rms-value of the chromatic dispersion over the wavelength range [1.25