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On the perturbation of the Q‐factor of the QR factorization
Numerical Linear Algebra with Applications, 2011SUMMARYThis paper gives normwise and componentwise perturbation analyses for the Q‐factor of the QR factorization of the matrix A with full column rank when A suffers from an additive perturbation. Rigorous perturbation bounds are derived on the projections of the perturbation of the Q‐factor in the range of A and its orthogonal complement.
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A Note on the Perturbation Bound of Q-factors
Acta Mathematicae Applicatae Sinica, English Series, 2004By adding the orthogonal projectors into the bound of unitary polar factors, a uniform perturbation bound of \(Q\)-factors is obtained, and on this basis the previous bounds are improved.
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Wavelet Transform With Tunable Q-Factor
IEEE Transactions on Signal Processing, 2011This paper describes a discrete-time wavelet transform for which the Q-factor is easily specified. Hence, the transform can be tuned according to the oscillatory behavior of the signal to which it is applied. The transform is based on a real-valued scaling factor (dilation-factor) and is implemented using a perfect reconstruction over-sampled filter ...
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Large Q-Factors in Small WGM Resonators
2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2019Thanks to progress in fabrication techniques, quality factors (Q) of whispering gallery mode (WGM) resonators are now well above one million with materials that are relevant to Photonic Integrated Circuits (PIC) [1,2]. However, so far only cavities with radii much larger than the operating wavelength λ reach such performances. In order to fully exploit
Acharyya, Nirmalendu, Kozyreff, Gregory
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Antenna Q-factor computation with FDTD method
11th International Symposium on Antenna Technology and Applied Electromagnetics [ANTEM 2005], 2005In this work, we have developed a new method for the calculation of the antenna quality factor by using the numerical method FDTD. The results obtained with our method are compared with the analytical approach of McLean and Geyi. The results show good agreement between FDTD and Geyi formulation.
Collardey, Sylvain +2 more
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Tolerable Q-Factor Variations in PCM Lines
IEEE Transactions on Communications, 1981This paper makes a theoretical assessment of the performance impairments that may be caused on PCM lines by the use of different timing extraction bandwidths in tandem. Two basic situations are examined: 1) random transmitted pattern, and 2) transition between two repetitive patterns.
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Mode localization and the Q-factor of a cylindrical microresonator
Optics Letters, 2010As opposed to the modes in an optical spherical/spheroidal microresonator, the whispering gallery modes in a long cylindrical microresonator are delocalized. Consequently, a circulating light beam that is evanescently coupled into the cylinder and experiences total internal reflection eventually radiates out along the cylinder axis.
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Economic Development. The Q Factor
National Civic Review, 1987Perry Davis, Editor, David L. Birch
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q-factor estimation for timber Blockhaus buildings
2016This paper investigates the structural response and vulnerability of Blockhaus buildings under seismic loads. Blockhaus systems are widely used in daily practice for the construction of wooden houses or commercial buildings (see for example (Rubner Haus AG SpA)). Native of forested areas, they are often built also in earthquakeprone regions.
BEDON, CHIARA +3 more
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