Results 71 to 80 of about 6,922,156 (258)

Electrons in the cosmic radiation [PDF]

, 1990
The nature of cosmic ray electrons and their radiation in the Universe has been studied. A convection associated diffusion model is proposed to describe the main characteristics of the large-scale distribution of cosmic ray electrons in the Galaxy: (1) a
Chi, Xinyu, Chi, X
core  

A study of radio frequency spectrum emitted by high energy air showers with LOFAR

EPJ Web of Conferences, 2017
The high number density of radio antennas at the LOFAR core in Northern Netherlands allows to detect radio signals emitted by cosmic ray induced air showers, and to characterize the geometry of the observed cascade in a detailed way.
Rossetto Laura, Bonardi Antonio, Buitink Stijn, Corstanje Arthur, Enriquez J. Emilio, Falcke Heino, Hörandel Jörg R., Mitra Pragati, Mulrey Katie, Nelles Anna, Rachen Jörg P., Schellart Pim, Scholten Olaf, Thoudam Satyendra, Trinh Gia, ter Veen Sander, Winchen Tobias   +16 more
doaj   +1 more source

Remnants of Galactic Subhalos and Their Impact on Indirect Dark-Matter Searches

Galaxies, 2019
Dark-matter subhalos, predicted in large numbers in the cold-dark-matter scenario, should have an impact on dark-matter-particle searches. Recent results show that tidal disruption of these objects in computer simulations is overefficient due to ...
Martin Stref, Thomas Lacroix, Julien Lavalle   +2 more
doaj   +1 more source

New geochronological constraints on Late Pleistocene glaciation in the southern Cadí Massif, SE Pyrenees

Journal of Quaternary Science, EarlyView.
ABSTRACT The Cadí Massif (42°17′09″ N, 1°38′11″ E; 2649 m a.s.l.) in the southeastern Pyrenees preserves clear evidence of Late Pleistocene glaciation, although previous research has focused almost exclusively on its northern slope. By contrast, the southern slope has remained largely unexplored.
M. Oliva, J. Ventura, A. Çiner, M. A. Sarıkaya, J. Bonsoms, K. M. Wilcken   +5 more
wiley   +1 more source

Models of DG‐Carbon Bands in Raman Spectra: Effects of Basis Functions and Initial Values on the Uniqueness and S/N of Fits Obtained for Atmospheric Aerosol Using Automated Methods

Journal of Raman Spectroscopy, EarlyView.
Raman spectra containing D/G features are fit using combinations of basis functions and initial conditions. Fits with two Lorentzian functions converged to a single optimized fit even with variation of initial peak positions. For five‐band fits, sometimes the final fit varied with initial conditions, and constraints on peak center position were ...
David C. Doughty, Steven C. Hill
wiley   +1 more source

Cosmic‐Ray Propagation in the Galaxy: Techniques and the Mean Matter Traversal

The Astrophysical Journal, 1998
After examining the techniques used for solving the equations describing the propagation of cosmic-ray nuclei in the Galaxy, we have introduced a technique that yields exact numerical solutions for the steady state equations. We have implemented this in a new code, which uses the Runge-Kutta numerical method and incorporates current knowledge of ...
S. A. Stephens, R. E. Streitmatter
openaire   +1 more source

Common‐Mode Rejection Shifted‐Excitation Raman Difference Spectroscopy (CMR‐SERDS) Preserves Broad Structure Predictive of Soil Organic Carbon

Journal of Raman Spectroscopy, EarlyView.
Common‐mode rejection (CMR) is introduced as a physics‐motivated preprocessing method for shifted excitation Raman difference spectroscopy (SERDS) that removes the shared background of paired measurements while preserving the noncommon excitation‐dependent component. Applied to more than 900 North American soil samples, CMR improves soil organic carbon
Mahsa Zarei, Miayan Larose, Natalia V. Solomatova, Sadegh Shokatian, Edward Grant   +4 more
wiley   +1 more source

The online laboratories for OCRA - Outreach Cosmic Ray Activities INFN project

, 2021
OCRA – Outreach Cosmic Ray Activities was born in 2018 as a national outreach project of INFN with the aim of collecting, within a national framework, the numerous public engagement activities in the field of cosmic ray physics already present at a local
V. Bocci, de Palma, F., G. Galbato, Convenga, F., Ilaria Veronesi, Di Sciascio, G., Bocci, V., A. Giampaoli, I. Veronesi, L. Caccianiga, F. de Palma, Di Nezza, P., Schioppa, M., R. Paoletti, M. Buscemi, G. Di Sciascio, Coluccia, M. R., Pugliese M., Aramo, Carla, Rossi, N., Liguori, D., P. Di Nezza, N. Rossi, Antolini, R., F. Iacoangeli, Cataldi, G., A. Candela, C. Evoli, M. Schioppa, Miozzi, S., Evoli, C., S. Miozzi, Galbato, G., M. R. Coluccia, R. Antolini, D. Liguori, Buscemi, M., Iacoangeli, F., Hemmer, S., Carla Aramo, F. Convenga, Caccianiga, L., Rozza, D., S. Hemmer, La Verde, G. Cataldi, Veronesi, I., R. Colalillo, D. Rozza, Giampaoli, A., M.R. Coluccia, Paoletti, R., Colalillo, R., Candela, A.   +53 more
core   +2 more sources

COSMIC: A Galaxy Cluster–Finding Algorithm Using Machine Learning

The Astrophysical Journal Supplement Series
Building a comprehensive catalog of galaxy clusters is a fundamental task for studies on structure formation and galaxy evolution. In this paper, we present Cluster Optical Search using Machine Intelligence in Catalogs (COSMIC), an algorithm utilizing ...
Da-Chuan Tian, Yang Yang, Zhong-Lue Wen, Jun-Qing Xia   +3 more
doaj   +1 more source

Establishment of Anti-cosmic Ray HPGe Gamma Spectrometer

Yuanzineng kexue jishu, 2023
Radionuclide verification is one of the four monitoring technologies used in International Monitoring System of Comprehensive Nuclear-Test-Ban Treaty (CTBT). The activity of radionuclides concerned by CTBT generally performs at the low-level.
ZHU Yuchen;LI Qi;FAN Yuanqing;ZHAO Yungang;WANG Shilian;ZHANG Xinjun;JIA Huaimao;ZHANG Ruiqin;LI Ruiying;ZHOU Jianliang
doaj