Results 31 to 40 of about 19,748,042 (292)

Solid Harmonic Wavelet Bispectrum for Image Analysis

Advanced Science, EarlyView.
The Solid Harmonic Wavelet Bispectrum (SHWB), a rotation‐ and translation‐invariant descriptor that captures higher‐order (phase) correlations in signals, is introduced. Combining wavelet scattering, bispectral analysis, and group theory, SHWB achieves interpretable, data‐efficient representations and demonstrates competitive performance across texture,
Alex Brown, Mathilda Avirett‐Mackenzie, Carolin Villforth, Georgios Exarchakis   +3 more
wiley   +1 more source

Supergalactic Structure of Multiplets with the Telescope Array Surface Detector [PDF]

EPJ Web of Conferences, 2019
Evidence of supergalactic structure of multiplets has been found for ultra-high energy cosmic rays (UHECR) with energies above 1019 eV using 7 years of data from the Telescope Array (TA) surface detector.
Lundquist Jon Paul, Sokolsky Pierre V.
doaj   +1 more source

Decay of High-Energy Astrophysical Neutrinos [PDF]

Physical Review Letters, 2003
Existing limits on the non-radiative decay of one neutrino to another plus a massless particle (e.g., a singlet Majoron) are very weak. The best limits on the lifetime to mass ratio come from solar neutrino observations, and are $τ/m \agt 10^{-4}$ s/eV for the relevant mass eigenstate(s).
Beacom, John F., Bell, Nicole F., Hooper, Dan, Pakvasa, Sandip, Weiler, Thomas J.   +4 more
openaire   +3 more sources

Investigation of Stray‐Light Patterns in the eROSITA X‐Ray Cameras

Astronomische Nachrichten, EarlyView.
ABSTRACT eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is the soft X‐ray instrument aboard the Spectrum‐Roentgen‐Gamma (SRG) mission, developed under the responsibility of the Max Planck Institute for Extraterrestrial Physics (MPE).
Veronika Stieglitz, Peter Friedrich, Susanne Friedrich, Konrad Dennerl, Michael Freyberg   +4 more
wiley   +1 more source

High Energy Astrophysics Program (HEAP) [PDF]

, 1998
This report reviews activities performed by the members of the USRA contract team during the 6 months of the reporting period and projected activities during the coming 6 months.
Palmer, David, Drake, Stephen, Cannizzo, John, Chan, Kai-Wing, Soong, Yang, McGlynn, Thomas A., Corcoran, Michael, Rots, Arnold, Sreekumar, P., Barthelmy, Scott, Snowden, Stephen, Mukai, Koji, Mitchell, John, Angelini, Lorella, Hua, Xin-Min, Lochner, James, Mandzhavidze, Natalie, Esposito, Joseph, Christian, Eric, Barrett, Paul   +19 more
core   +2 more sources

Unveiling hidden millihertz quasi-periodic oscillations in 1A 0535+262

Astronomy & Astrophysics
Context. Be/X-ray binary pulsars exhibit transient outbursts and complex timing behaviour, including millihertz quasi-periodic oscillations (QPOs), whose physical origin and energy dependence remain poorly understood.
Yang Zihan, Ma Ruican, Méndez Mariano, Li Ze-Xi, Zhao Q. C., Li Panping, Tao Lian, Zhang Shuang-Nan, Zhang Liang, Feng Hua, Ma Xiang, Huang Yue   +11 more
doaj   +1 more source

High-energy photon polarimeter for astrophysics [PDF]

Journal of Astronomical Telescopes, Instruments, and Systems, 2018
A high-energy photon polarimeter for astrophysics studies in the energy range from 10 MeV to 800 MeV is considered. The proposed concept uses a stack of silicon micro-strip detectors where they play the roles of both a converter and a tracker. The purpose of this paper is to outline the parameters of such a polarimeter and to estimate the productivity ...
Eingorn, Maxim, Fernando, Lakma, Vlahovic, Branislav, Ilie, Cosmin, Wojtsekhowski, Bogdan, Urciuoli, Guido Maria, De Persio, Fulvio, Meddi, Franco, Nelyubin, Vladimir   +8 more
openaire   +2 more sources

Unintegrated Gluon Distributions as Probability Densities for QCD Dynamical Entropy

Astronomische Nachrichten, EarlyView.
ABSTRACT We present a systematic procedure for constructing normalized transverse momentum probability distributions from phenomenological unintegrated gluon distributions (UGDs). These distributions provide the probabilistic foundation of the QCD dynamical entropy formalism and can be employed in the evaluation of other statistical observables.
G. S. Ramos, Magno V. T. Machado
wiley   +1 more source

High Energy Astrophysics Program [PDF]

, 1996
This report reviews activities performed-by members of the USRA contract team during the six months of the reporting period and projected activities during the coming six months.

core   +2 more sources

Principal Component‐Based Classification of Blazar Candidates of Uncertain Type in the 4FGL/LAT

Astronomische Nachrichten, EarlyView.
ABSTRACT We adopted principal component analysis (PCA), linear discriminant analysis (LDA), and support vector machines (SVM), to study classification for a sample of 2708 Fermi blazars: 1142 BL Lac objects (BLLs), 759 flat spectrum radio quasars (FSRQs), and 807 blazar candidates of uncertain type (BCUs).
Wen‐Xin Yang, Guo‐Hai Chen, Jing‐Tian Zhu, Hong‐Guang Wang, Denis Bastieri, Xu‐Hong Ye, Jing‐Chao Liang, De‐Xiang Wu, Jiang‐He Yang, Anton A. Strigachev, Rumen S. Bachev, Jun‐Jie Feng, Yi Liu, Jun‐Hui Fan   +13 more
wiley   +1 more source