Results 251 to 260 of about 374,167 (276)
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AIP Conference Proceedings, 1997
We model the temporally evolving nonthermal particle and photon spectra at different stages in the lifetime of a standard shell-type supernova remnant. A characteristic νFν spectrum of a SNR consists of a peak at radio-through-optical energies from nonthermal electron synchrotron emission and another high-energy gamma-ray peak due primarily to ...
Steven J. Sturner +3 more
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We model the temporally evolving nonthermal particle and photon spectra at different stages in the lifetime of a standard shell-type supernova remnant. A characteristic νFν spectrum of a SNR consists of a peak at radio-through-optical energies from nonthermal electron synchrotron emission and another high-energy gamma-ray peak due primarily to ...
Steven J. Sturner +3 more
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2011
In this chapter an investigation is made of the apparent limit on the obtainable SNR of a 1-bit look-ahead sigma-delta modulator. The outcome of this investigation is that there is a point of maximal noise shaping, which depends on the filter order.
Janssen, Erwin, van Roermund, Arthur
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In this chapter an investigation is made of the apparent limit on the obtainable SNR of a 1-bit look-ahead sigma-delta modulator. The outcome of this investigation is that there is a point of maximal noise shaping, which depends on the filter order.
Janssen, Erwin, van Roermund, Arthur
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An investigation of SNRs in the magellanic clouds—SNR B0450-708 and SNR B0455-687
AIP Conference Proceedings, 2001We are studying the nature and the spatial distribution of ∼80 supernova remnants (SNRs) in the Magellanic Clouds (MCs). A multi-frequency comparison of these sources involves the latest radio, IR, optical and X-ray surveys with angular resolution of ∼1′. Their morphology, birth rate and overall properties are investigated and compared with SNRs in our
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Proceedings of the 44th International Conference on Software Engineering, 2022
Yiwen Dong +3 more
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Yiwen Dong +3 more
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Simultaneous SNR and SNR-variation optimization for sigma-delta modulator design
2014 12th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT), 2014Given a loop-filter topology, a switched-capacitor sigma-delta modulator (SC-SDM) can be optimized with respect to its loop transfer function (LTF) coefficients. However, if the goal is to co-optimize signal-to-noise ratio (SNR) and SNR-variation, fast computation of both measures becomes a critical issue. In this paper a simulated-annealing (SA) based
Ailin Zhang +3 more
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A reduced complexity SNR estimator
IET Conference Publications, 2009This paper presents a novel reduced complexity SNR estimator, whose performances are comparable with the maximum-likelihood estimator while saving one half of the floating point multiplications and one third of the floating point sums. A detailed statistical description of the estimate, as well as simulation results, are provided. (4 pages)
CANDREVA, ENZO ALBERTO +2 more
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Arquivos rio-grandenses de medicina, 2012
Srs. Médicos!Contribuí para o progresso de Porto Alegre, fazendo o suprimento de ÓLEO e GASOLINA para o vosso automóvel nos Postos de Serviço.
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Srs. Médicos!Contribuí para o progresso de Porto Alegre, fazendo o suprimento de ÓLEO e GASOLINA para o vosso automóvel nos Postos de Serviço.
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Improved SNR Estimation Algorithm
2017 International Conference on Computer Systems, Electronics and Control (ICCSEC), 2017As for several NDA SNR estimation algorithm for QPSK signal, their SNR estimation performance is poor. This article puts forward an improved low complexity SNR estimation algorithm to improve the SNR estimation range and accuracy. The mean, bias and variance of the new algorithm are simulated.
Xu Qun, Zhou Jian
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Coherent snr estimator performance
IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004, 2005Signal-to-noise ratio (SNR) is an important system parameter in mobile communication systems and other advanced communication systems. Coherent and noncoherent SNR estimators can be used to dynamically estimate SNR. In this paper, a coherent SNR estimator is proposed and its performance is provided.
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Advances in Space Research, 2000
Abstract We present the results of hard X-ray emissions from the shell of supernova remnants (SNR) revealed with the ASCA imaging and spectroscopic observations. The hard X-ray spectra and morphologies are consistent with synchrotron emission from extremely high energy electrons of 10–100 TeV.
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Abstract We present the results of hard X-ray emissions from the shell of supernova remnants (SNR) revealed with the ASCA imaging and spectroscopic observations. The hard X-ray spectra and morphologies are consistent with synchrotron emission from extremely high energy electrons of 10–100 TeV.
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