搜索结果: 31-45 共查到“理学 SPECTRAL”相关记录517条 . 查询时间(0.151 秒)
THE NONCOMMUTATIVE WIENER LEMMA,LINEAR INDEPENDENCE,AND SPECTRAL PROPERTIES OF THE ALGEBRA OF TIME-FREQUENCY SHIFT OPERATORS
NONCOMMUTATIVE WIENER LEMMA LINEAR INDEPENDENCE SPECTRAL PROPERTIES OF THE ALGEBRA TIME-FREQUENCY SHIFT OPERATORS
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2015/9/29
In this paper we analyze the Banach *-algebra of time-frequency shifts with absolutely summable coefficients. We prove a noncommutative version of the Wiener lemma. We also construct a faithful tracia...
Sensitivity experiments to mountain representations in spectral models
spectral models mountain representations
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2015/9/28
This paper describes a set of sensitivity experiments to several formulations of orography. Three sets are considered: a "Standard" orography consisting of an envelope orography produced originally fo...
Time intermittency and spectral features of the geomagnetic field
nonlinear processes in geophysics geomagneticfield Earth's core fluid dynamics turbulence
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2015/9/11
In the field of geomagnetism a number of studies have been devoted to the investigation of turbulence and intermittency in the outer core fluid motions. Here, in order to obtain information on such ph...
Accuracy in mineral identification: image spectral and spatial resolutions and mineral spectral properties
reflectance spectroscopy VIS-SWIR rock identification spectral resolution spatial resolution noise effects
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2015/9/7
Problems related to airborne hyperspectral image data are reviewed and the requirements for data analysis applied to mineralogical (rocks and soils) interpretation are discussed. The variability of mi...
FASA Fire Airborne Spectral Analysis of natural disasters
remote sensing wild fires volcano emissions Fourier spectrometry data-fusion
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2015/9/7
At present the authors are developing the system FASA, an airborne combination of a Fourier Transform Spectrometer and an imaging system. The aim is to provide a system that is usable to investigate a...
Spectral emissivity and temperature maps of the Solfatara crater from DAIS hyperspectral images
hyperspectral data surface temperature spectral emissivity ara (Phlegraean Fields) DAIS
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2015/9/7
Quantitative maps of surface temperature and spectral emissivity have been retrieved on the Solfatara crater at Pozzuoli (Naples) from remote sensing hyperspectral data. The present study relies on th...
Asymptotic Equivalence of Spectral Density Estimation and Gaussian White Noise
Stationary Gaussian process spectral density Sobolev classes Le Cam distance asymptotic equivalence Whittle likelihood log-periodogram regression nonparametric Gaussian scale model signal in Gaussian white noise
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2015/8/25
We consider the statistical experiment given by a sample y(1), . . . , y(n) of a stationary Gaussian process with an unknown smooth spectral density f. Asymptotic equivalence, in the sense of Le Cam’s...
ASYMPTOTIC EQUIVALENCE OF SPECTRAL DENSITY ESTIMATION AND GAUSSIAN WHITE NOISE
ASYMPTOTIC EQUIVALENCE SPECTRAL DENSITY ESTIMATION GAUSSIAN WHITE NOISE
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2015/8/25
We consider the statistical experiment given by a sample y(1), . . . , y(n) of a stationary Gaussian process with an unknown smooth spectral density f . Asymptotic equivalence, in the sense of Le Cam’...
Spectral Regularization Algorithms for Learning Large Incomplete Matrices
collaborative filtering nuclear norm spectral regularization netflix prize large scale convex optimization
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2015/8/21
We use convex relaxation techniques to provide a sequence of regularized low-rank solutions for large-scale matrix completion problems. Using the nuclear norm as a regularizer, we provide a simple and...
FIR filter design via spectral factorization and convex optimization
Finite impulse response filter filter coefficient variables spectral decomposition linear and nonlinear convex programming
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2015/8/11
We consider the design of finite impulse response (FIR) filters subject to upper and lower bounds on the frequency response magnitude. The associated optimization problems, with the filter coefficient...
A duality view of spectral methods for dimensionality reduction
Duality spectrum the nonlinear dimension reduction locally linear embedding Laplacian sparse matrix
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2015/8/10
We present a unified duality view of several recently emerged spectral methods for nonlinear dimensionality reduction, including Isomap, locally linear embedding, Laplacian eigenmaps, and maximum vari...
Pan-spectral observing system simulation experiments of shortwave reflectance and long-wave radiance for climate model evaluation
Pan-spectral observing system simulation experiments shortwave reflectance long-wave radiance climate model evaluation
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2015/8/6
Top-of-atmosphere (TOA) spectrally resolved shortwave reflectances and long-wave radiances describe the response of the Earth's surface and atmosphere to feedback processes and human-induced forcings....
SPECTRAL REFLECTANCE OF ALFALFA GROWN UNDER DIFFERENT WATER TABLE DEPTHS
Multispectral Detection Agriculture Monitoring Reflectance
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2015/7/30
Plant water stress can limit productivity and has an effect on plant physiology and canopy architecture. Changes in water status of a
canopy can have indirect effects on remotely sensed optical refl...
Sensitivity Analysis of Spectral Indices to Ozone Absorption Using Physical Simulations in a Forest Environment: Comparative Study between MODIS, SPOT VéGéTATION & AVHRR
Spectral Indices Ozone Absorption Using Physical Simulations
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2015/7/29
Considering a forest cover (Balsam Fir with various densities) we analyze the sensitivity of several vegetation indices to
ozone absorption using physical simulations in the spectral bands of MODIS,...
QUANTIFYING THE ECOLOGICAL PATTERNS OF URBAN DENSIFICATION THROUGH MULTIPLE ENDMEMBER SPECTRAL MIXTURE ANALYSIS, LANDSCAPE METRICS, AND FUZZY LOGIC
Sustainability Urban Change MESMA Fuzzy Logic Landscape Metrics Los Angeles
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2015/7/29
This paper introduces an integrative methodology that has been developed to measure temporal changes in urban morphology based
on the techniques of multiple endmember spectral mixture analysis (MESM...