Results 51 to 60 of about 152,938 (206)

Redshift Dependence of QSO Spectral Variability

, 2004
We present a combined analysis of the optical spectral variability for two samples of QSOs, 42 objects at $z<0.4$ monitored at the Wise Observatory (Giveon et al 1999), plus 59 objects up to $z\sim 3$ in the field of the Magellanic Clouds, detected and/or monitored within the MACHO Project database (Geha et al 2003). Our analysis shows some increase
VAGNETTI, FAUSTO, Trevese, D.
openaire   +4 more sources

Spectral Variability Augmented Sparse Unmixing of Hyperspectral Images

, 2021
Spectral unmixing (SU) expresses the mixed pixels existed in hyperspectral images as the product of endmember and abundance, which has been widely used in hyperspectral imagery analysis.
Feng, Yan, Zhang, Ge, Ma, Mingyang, Mei, Shaohui, Du, Qian   +4 more
core   +1 more source

Heart Rate Variability Analysis in General Medicine [PDF]

, 2003
Autonomic nervous system plays an integral role in homeostasis. Autonomic modulation can frequently be altered in patients with cardiac disorders as well as in patients with other critical illnesses or injuries.
Marek Malik, Gang, Yi, Malik, M, Gang, Y, Malik, Marek, Yi Gang   +5 more
core  

Reducing the impacts of intra-class spectral variability on the accuracy of soft classification and super-resolution mapping of shoreline

, 2019
The main objective of this research is to assess the impact of intra-class spectral variation on the accuracy of soft classification and super-resolution mapping.
Doan, Huong T.X., Bui, Dieu Tien, Foody, Giles M.   +2 more
core   +1 more source

Comparison of Stochastic Methods for the Variability Assessment of Technology Parameters [PDF]

, 2011
This paper provides and compares two alternative solutions for the simulation of cables and interconnects with the inclusion of the effects of parameter uncertainties, namely the Polynomial Chaos (PC) method and the Response Surface Modeling (RSM).
Stievano, Igor Simone, Fontana, Michele, Paolo Manfredi, Michele Fontana, Igor S. Stievano, Flavio G. Canavero, Manfredi, Paolo, Canavero, Flavio   +7 more
core   +1 more source

A Sparse Representation Method for a Priori Target Signature Optimization in Hyperspectral Target Detection

IEEE Access, 2018
Many target detectors commonly utilize a single a priori target spectral signature as an input. However, the detection results are greatly affected by the quality of the a priori target spectral signature because the spectral variability phenomenon is ...
Ting Wang, Hongsheng Zhang, Hui Lin, Xiuping Jia   +3 more
doaj   +1 more source

Modern spectral analysis in HF radar remote sensing. [PDF]

, 1998
High-Frequency (HF) radar systems are currently used to collect wave data. By applying spectral analysis methods, such as the Fast Fourier Transform (FFT) method, to the radar backscatter from the ocean surface, the so-called Doppler spectrum is ...
Vizinho, A., Vizinho, A
core  

Estimating the irradiance spectrum from measurements in a limited number of spectral bands

, 2006
Accurate measurement and characterisation of fluctuations in the irradiance environment is important for many areas of optical remote sensing. This paper describes a method of estimating spectral irradiance over the region 400 – 1000 nm from the radiance
Milton, E.J., Rollin, E.M.
core   +1 more source

Airborne high spectral resolution lidar observation of pollution aerosol during EUCAARI-LONGREX [PDF]

, 2013
Airborne high spectral resolution lidar observations over Europe during the EUCAARI-LONGREX field experiment in May 2008 are analysed with respect to the optical properties of continental pollution aerosol.
A. Fix, Minikin, Andreas, M. Esselborn, Groß, Silke, Abicht, Florian, Fix, Andreas, A. Minikin, Fix, A., Abicht, F., Esselborn, Michael, S. Groß, F. Abicht, Wirth, M., Minikin, A., Esselborn, M., Groß, S., M. Wirth, Wirth, Martin   +17 more
core   +1 more source

Rotation, spectral variability, magnetic geometry and magnetosphere of the Of?p star CPD -28° 2561 [PDF]

, 2015
peer reviewedWe report magnetic and spectroscopic observations and modelling of the Of?p star CPD -28° 2561. Using more than 75 new spectra, we have measured the equivalent width variations and examined the dynamic spectra of photospheric and wind ...
Petit, V., Sundqvist, J. O., Naze, Y., Barbá, R. H., ud-Doula, A., MiMeS Collaboration, Wade, G. A., Gamen, Roberto Claudio, Alfaro, E. J., Nazé, Yaël, Sota, A., Morrell, Nidia Irene, Sota, A, sMaíz Apellániz, J., Walborn, N. R., Arias, J. I., Maíz Apellániz, J., Townsend, R. H. D., Maíz Apellaniz, J, Grunhut, J., Arias, Julia Ines, Alecian, E., MiMeS Collaboration,, Barbá, Rodolfo Héctor, Gamen, R., Doula, A. ud, Martins, F., Morrell, N.   +27 more
core   +1 more source