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Relevant bibliographies by topics / Power Specturm

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Journal articles

Academic literature on the topic 'Power Specturm'

Author: Grafiati

Published: 1 April 2023

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Journal articles on the topic "Power Specturm"

1

Fedi, Maurizio, Tatiana Quarta, and Angelo De Santis. "Inherent power‐law behavior of magnetic field power spectra from a Spector and Grant ensemble." GEOPHYSICS 62, no. 4 (1997): 1143–50. http://dx.doi.org/10.1190/1.1444215.

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The Spector and Grant method, which has been in use for 25 years, relates average depths to source to rate of decay of the magnetic power spectra. This method, which assumes a uniform distribution of parameters for an ensemble of magnetized blocks, leads to a depth‐dependent exponential rate of decay. We show that also inherent in this model is a power‐law rate of decay that is independent of depth. For most cases, except for extreme depths and small block sizes, the observed power spectrum should be corrected for a power law decay rate of β∼3. If the depth distribution of the magnetic blocks

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Deepali, Deepali, and Supratik Banerjee. "Scale-dependent anisotropy of electric field fluctuations in solar wind turbulence." Monthly Notices of the Royal Astronomical Society: Letters 504, no. 1 (2021): L1—L6. http://dx.doi.org/10.1093/mnrasl/slab027.

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ABSTRACT We study the variation of average powers and spectral indices of electric field fluctuations with respect to the angle between average flow direction and the mean magnetic field in solar wind turbulence. Cluster spacecraft data from the years 2002 and 2007 are used for the present analysis. We perform a scale-dependent study with respect to the local mean magnetic field using wavelet analysis technique. Prominent anisotropies are found for both the spectral index and power levels of the electric power spectra. Similar to the magnetic field fluctuations, the parallel (or antiparallel)

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3

Koch, Eric W., I.-Da Chiang (江宜達), Dyas Utomo, et al. "Spatial power spectra of dust across the Local Group: No constraint on disc scale height." Monthly Notices of the Royal Astronomical Society 492, no. 2 (2019): 2663–82. http://dx.doi.org/10.1093/mnras/stz3582.

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ABSTRACT We analyse the 1D spatial power spectra of dust surface density and mid to far-infrared emission at $24\!-\!500\, \mu$m in the LMC, SMC, M31, and M33. By forward-modelling the point spread function (PSF) on the power spectrum, we find that nearly all power spectra have a single power-law and point source component. A broken power-law model is only favoured for the LMC 24 μm MIPS power spectrum and is due to intense dust heating in 30 Doradus. We also test for local power spectrum variations by splitting the LMC and SMC maps into 820 pc boxes. We find significant variations in the powe

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4

Jang, Doyoung, Jongmann Kim, Yong Bae Park, and Hosung Choo. "Study of an Atmospheric Refractivity Estimation from a Clutter Using Genetic Algorithm." Applied Sciences 12, no. 17 (2022): 8566. http://dx.doi.org/10.3390/app12178566.

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In this paper, a method for estimating atmospheric refractivity from sea and land clutters is proposed. To estimate the atmospheric refractivity, clutter power spectrums based on an artificial tri-linear model are calculated using an Advanced Refractive Prediction System (AREPS) simulator. Then, the clutter power spectrums are again obtained based on the measured atmospheric refractivity data using the AREPS simulator. In actual operation, this spectrum from measured reflectivity can be replaced with real-time clutter spectrums collected from radars. A cost function for the genetic algorithm (

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Unruh, J. F., and D. D. Kana. "Power/Response Spectrum Transformations in Equipment Qualification." Journal of Pressure Vessel Technology 107, no. 2 (1985): 197–202. http://dx.doi.org/10.1115/1.3264434.

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Since its introduction a few years ago the use of the power/response spectrum transformation has gained considerable interest and acceptance, and a number of new applications of the transformation have been developed in the equipment qualification area. A brief review of the power/response spectrum transformation is given with a discussion of the input/output relationships for linear systems required for elevated power spectrum generation. Frequency content of earthquakelike signals is discussed with emphasis on the resolution given by the PSD. The problem of excessive ZPA due to inconsistent

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6

Kurita, Toshiki, Masahiro Takada, Takahiro Nishimichi, Ryuichi Takahashi, Ken Osato, and Yosuke Kobayashi. "Power spectrum of halo intrinsic alignments in simulations." Monthly Notices of the Royal Astronomical Society 501, no. 1 (2020): 833–52. http://dx.doi.org/10.1093/mnras/staa3625.

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ABSTRACT We use a suite of N-body simulations to study intrinsic alignments (IA) of halo shapes with the surrounding large-scale structure in the ΛCDM model. For this purpose, we develop a novel method to measure multipole moments of the three-dimensional power spectrum of the E-mode field of halo shapes with the matter/halo distribution, $P_{\delta E}^{(\ell)}(k)$ (or $P^{(\ell)}_{{\rm h}E}$), and those of the auto-power spectrum of the E-mode, $P^{(\ell)}_{EE}(k)$, based on the E/B-mode decomposition. The IA power spectra have non-vanishing amplitudes over the linear to non-linear scales, an

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Czarnecki, Mirosław A. "Two-Dimensional Correlation Spectroscopy: The Power of Power Spectra." Applied Spectroscopy 74, no. 8 (2020): 894–99. http://dx.doi.org/10.1177/0003702820931156.

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Power spectra are a powerful tool provided by two-dimensional correlation analysis. However, this tool is seldom used in practice. This work shows selected examples of using of the power spectra for the study of various kinds of samples with the aim to promote more common use of this tool. By examination of the power spectrum of specific sample, one can estimate the sensitivity of different molecular fragments on a given perturbation. Determination of the power spectra for smaller data subsets provides information on the dynamics of perturbation-induced spectral changes. If the experimental sp

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Jackson, Ross A. "Haunted Across the Political Spectrum: The Specter of Communism in Two Midcentury American Organizations." International Journal of Languages, Literature and Linguistics 7, no. 4 (2021): 149–56. http://dx.doi.org/10.18178/ijlll.2021.7.4.303.

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Organizations operating in midcentury America experienced a period of relative economic prosperity and global power. While political tensions existed between the United States and the Soviet Union since the culmination of the World War II, when the Soviet Union conducted its first nuclear test in 1949 and then successfully launched Sputnik 1 in 1957, these political tensions became more pressing concerns to American organizations. In fact, the perceived existential threat posed by communism became an observable rhetorical justification for organization and action within the United States. Thro

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Cheng, Yun-Ting, and Tzu-Ching Chang. "Cosmic Near-infrared Background Tomography with SPHEREx Using Galaxy Cross-correlations." Astrophysical Journal 925, no. 2 (2022): 136. http://dx.doi.org/10.3847/1538-4357/ac3aee.

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Abstract The extragalactic background light (EBL) consists of integrated light from all sources of emission throughout the history of the universe. At near-infrared wavelengths, the EBL is dominated by stellar emission across cosmic time; however, the spectral and redshift information of the emitting sources is entangled and cannot be directly measured by absolute photometry or fluctuation measurements. Cross-correlating near-infrared maps with tracers of known redshift enables EBL redshift tomography, as EBL emission will only correlate with external tracers from the same redshift. Here, we f

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Karaçaylı, Naim Göksel, Andreu Font-Ribera та Nikhil Padmanabhan. "Optimal 1D Ly α forest power spectrum estimation – I. DESI-lite spectra". Monthly Notices of the Royal Astronomical Society 497, № 4 (2020): 4742–52. http://dx.doi.org/10.1093/mnras/staa2331.

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ABSTRACT The 1D Ly α forest flux power spectrum P1D is sensitive to scales smaller than a typical galaxy survey, and hence ties to the intergalactic medium’s thermal state, suppression from neutrino masses, and new dark matter models. It has emerged as a competitive framework to study new physics, but also has come with various challenges and systematic errors in analysis. In this work, we revisit the optimal quadratic estimator for P1D, which is robust against the relevant problems such as pixel masking, time evolution within spectrum, and quasar continuum errors. We further improve the estim

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