This document is an inclusive method for the double bass and comprises etudes and exercises inspired by Sei Studi (1981/83) composed by the Italian double bass virtuoso Stefano Scodanibbio (1956-2012). The etudes and exercises in the method are based on the analysis of seven categories of harmonic gestures that exemplify Scodanibbio’s “Avant Garde”...
© 2018. The American Astronomical Society. All rights reserved. The shape of the damping profile of kink oscillations in coronal loops has recently allowed the transverse density profile of the loop to be estimated. This requires accurate measurement of the damping profile that can distinguish the Gaussian and exponential damping regimes, otherwise...
Parallel operation of multiple grid-connected power converters through LCL filters is known to have the potential problem of triggering oscillations in the ac mains. Such oscillatory frequencies are not integral multiples of the fundamental frequency and hence form a new source of interharmonics. Early detection of such oscillations is essential fo...
Permanent Magnet Synchronous Machines (PMSMs) are popular due to their high efficiency and favorable dynamic properties. In practice, these machines often have a back-emf waveform which deviates from an theoretically ideal sinusoid or trapezoid. In the past, current waveform shaping techniques were developed for these machines to calculate non-conv...
We demonstrate that the amplification of attosecond pulse in Xray free electron laser (FEL) undulator can be tailored. The characteristic of the amplification of an isolated attosecond pulse in the FEL undulator is investigated. An isolated 180 attoseconds full width half maximum (FWHM) pulse at 1.25 nm with a spectral bandwidth of 1% is injected i...
A method to generate an isolated single-cycle attosecond pulse from the interaction of a high-power femtosecond laser pulse with a nano-tube array is demonstrated using a two-dimensional relativistic particle-in-cell simulation. The radiation mechanism is relativistic nonlinear Thomson scattering from the electrons in a target material. Coherent ra...
Improvement of the power quality in the utility grid can be obtained by connecting damping power-electronic devices. Regarding the increased presence of converter-based distributed generation units in the power system, an active front end for distributed generation units is extended with a mitigating function. However, in order to encourage the con...
We derive the algebraic relations of alternating and non-alternating finite harmonic sums up to the sums of depth 6. All relations for the sums up to weight 6 are given in explicit form. These relations depend on the structure of the index sets of the harmonic sums only, but not on their value. They are therefore valid for all other mathematical ob...
This paper describes an effective frequency doubler scheme for SASE free electron lasers. It consists of an undulator tuned to the first harmonic, a dispersion section, and a tapered undulator tuned to the second harmonic. The first stage is a conventional soft X-ray SASE FEL. Its gain is controlled in such a way that the maximum energy modulation ...
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