Results 81 to 90 of about 23,536 (235)
Can teaching be taught? Improving teachers' pedagogical skills at scale in rural Peru
Quantitative Economics, Volume 16, Issue 1, Page 185-233, January 2025.We evaluate the impact of a large‐scale teacher coaching program in Peru, a context with high teacher turnover, on teachers' pedagogical skills and student learning. Previous studies find that small‐scale coaching programs can improve teaching of reading and science in developing countries.
Juan F. Castro +4 more
wiley +1 more source
Recognizing Blazars Using Radio Morphology from the VLA Sky Survey
The Astrophysical JournalBlazars are radio-loud active galactic nuclei whose jets have a very small angle to our line of sight. Observationally, the radio emissions are mostly compact or compact-core with a one-sided jet.
Zhang-Liang Xie +6 more
doaj +1 more source
Polarization Vector Rotations: Real, Spurious, Hidden and Imaginary
Galaxies, 2016 Large and variable polarization is an inherent property of a majority of blazars. Systematic rotations of the polarization vector have been claimed for several blazars. In some cases, however, the reality of these rotations may be questionable.
Valeri M. Larionov +3 more
doaj +1 more source
TeV gamma rays from blazars beyond z=1?
, 2013 At TeV energies, the gamma-ray horizon of the universe is limited to redshifts z1, if the observed gamma rays are secondary photons produced in interactions of high-energy protons originating from the blazar jet and propagating over cosmological ...
A. Zech +4 more
core +1 more source
Astroparticle Physics, 1999 TeV emission can be a common characteristic of low power blazars. This is in line with the sequence of blazars relating the observed bolometric luminosity with their overall spectral energy distribution. Detecting new TeV blazars, possibly at different redshifts, is important for studying the particle acceleration process operating in the jet, and it ...
openaire +3 more sources
Radiation processes in blazars [PDF]
AIP Conference Proceedings, 1997 We present an overview of the current theoretical models attempting to describe the structure and radiative processes operating in blazars and discuss the observational constraints that these models must confront.
openaire +2 more sources
Review of Education, Volume 12, Issue 3, December 2024.Abstract The world map is changing due to waves of immigration, population and demographic changes in mainland Europe and North America. There is a growing need for a more diverse teacher workforce to close the racial and ethnic gap between students and teachers in populations with high diversity.
Eman Abo‐Zaed Arar, Ahmed Tlili
wiley +1 more source
Extragalactic jets: the high energy view
, 2004 I review the current knowledge of high-energy emission from extragalctic jets. First I discuss gamma-ray emission from blazars, which provides us numerous precious information on the innermost portions of the relativistic jets. I describe the constraints
Tavecchio, Fabrizio
core +2 more sources
Astronomy and Astrophysics Supplement Series, 1998 The results of both BVRI CCD photometric monitoring and fast photometry for 8 blazars and variable quasars are presented. There is intraday variability for 6 blazars and very short timescales (minutes to two hours) variability for 5 objects. Implications for relativistic beaming are briefly discussed.
Guibin Jia +3 more
openaire +1 more source
Lessons from the apparent peculiar nature of the star TYC 6544‐3483‐1
Astronomische Nachrichten, Volume 345, Issue 4, May 2024.Abstract We report a radio and optical study of the star TYC 6544‐3483‐1 originally selected as a follow‐up target in the course of our efforts to cross‐identify Galactic high‐energy sources. The star by itself finally turned out to be a very ordinary main‐sequence star despite the initial expectations that apparently pointed to the contrary.
Josep Martí +5 more
wiley +1 more source