Results 271 to 280 of about 235,731 (299)

Accelerating ptychography with spectral initializations

Quantitative Phase Imaging VII, 2021
Combining synthetic aperture approaches with reference-less setups, ptychography is a promising phase retrieval technique for label-free quantitative phase imaging. Within the phase retrieval community, spectral methods are known to accelerate gradient descent schemes, however their positive effect on experimental ptychographic datasets has not been ...
Lorenzo Valzania, Jonathan Dong, Sylvain Gigan   +2 more
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Empirical Correlations between the Spectral Input Energy and Spectral Acceleration

Journal of Earthquake Engineering, 2022
Correlating different intensity measures (IMs) enables the joint consideration of multiple IMs in various performance-based earthquake engineering applications, such as ground motion selection. The correlations between the spectral input energy and spectral accelerations have not been previously examined.
Yin Cheng, Jianfeng Wang, Yingbin Zhang, Fabrizio Mollaioli   +3 more
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Accelerated Spectral Analysis of Compact Operators

SIAM Journal on Numerical Analysis, 1984
Let K be a linear compact operator in a Banach space. The eigenvalues and eigenelements of K are to be approximated. Let \(\tilde K\) be an operator of a finite rank such that \(r(\Delta)
Dellwo, David R., Friedman, Morton B.
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Which Spectral Acceleration are you Using?

Earthquake Spectra, 2006
Analysis of the seismic risk to a structure requires assessment of both the rate of occurrence of future earthquake ground motions (hazard) and the effect of these ground motions on the structure (response). These two pieces are often linked using an intensity measure such as spectral acceleration. However, earth scientists typically use the geometric
Jack W. Baker, C. Allin Cornell
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Spatial Correlation of Spectral Acceleration in European Data

Bulletin of the Seismological Society of America, 2012
Abstract Quantification of regional seismic risk is based on spatially correlated random fields and requires modeling of the joint distribution of ground‐motion intensity measures at all sites of interest. In particular, when a portfolio of buildings or a transportation/distribution network (lifeline) is of concern, correlation models for elastic ...
Esposito S., IERVOLINO, IUNIO
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Photon spectral characteristics of dissimilar linear accelerators

Medical Physics, 2008
This work measures and compares the energy spectra of four dosimetrically matched beams, generated from four physically different linear accelerators. The goal of this work is twofold. First, this study determines whether the spectra of dosimetrically matched beams are measurably different.
William H. Hinson, William T. Kearns, Allan F. deGuzman, J. Daniel Bourland   +3 more
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Spectral Analysis of Ground Acceleration-Based Testing

Transportation Research Record: Journal of the Transportation Research Board, 2009
Spectral analysis of downhole acceleration data is used to identify changes in elastic properties of track substructure. The spectral analysis is based on the power spectral density (PSD) as an indicator of frequency content. This method was developed and tested at the Transportation Technology Center, Inc., in Pueblo, Colorado. The system provides an
Ho, Carlton L, Hyslip, James P, Li, Dingqing   +2 more
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Accelerating spectral clustering with partial supervision

Data Mining and Knowledge Discovery, 2010
Spectral Clustering is a popular learning paradigm that employs the eigenvectors and eigenvalues of an appropriate input matrix for approximating the clustering objective. Albeit its empirical success in diverse application areas, spectral clustering has been criticized for its inefficiency when dealing with large-size datasets.
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Accelerating spectral unmixing by using clustered images

2017 IEEE International Conference on Image Processing (ICIP), 2017
We propose the usage of a clustering step before the unmixing of hyperspectral images. This circumvents or at least mitigates the drawback of having a large amount of data that has to be processed by taking advantage of the large number of similar pixels and merging similar pixels into clusters. Afterwards, only the cluster centroids have to be unmixed
Bauer, Sebastian, Winterbauer, Eric, Puente León, Fernando   +2 more
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A Ground Motion Prediction Model for Average Spectral Acceleration

Journal of Earthquake Engineering, 2021
Héctor Dávalos, Eduardo Miranda
exaly