Results 71 to 80 of about 71,531 (348)

Auto-detection of strong gravitational lenses using convolutional neural networks

Emergent Scientist, 2018
We propose a method for the automated detection of strong galaxy-galaxy gravitational lenses in images, utilising a convolutional neural network (CNN) trained on 210 000 simulated galaxy-galaxy lens and non-lens images.
Pearson James, Pennock Clara, Robinson Tom   +2 more
doaj   +1 more source

Infrared Counterpart of the Gravitational Lens 1938+66.6 [PDF]

, 1996
We report the detection of a very red source coincident with the gravitational lens 1938+66.6 (Patnaik et al. 1992) in K' (2.12 micron), H (1.6 micron), J (1.25 micron), and Thuan-Gunn r (0.65 micron) bands.
Kundic, Tomislav, Malhotra, Sangeeta, Rhoads, James E.   +2 more
core   +3 more sources

Survey of Gravitationally-lensed Objects in HSC Imaging (SuGOHI). VIII. New galaxy-scale lenses from the HSC SSP [PDF]

, 2022
Kenneth C. Wong, J. H. H. Chan, Dani C. -Y. Chao, Anton T. Jaelani, Issha Kayo, Chien‐Hsiu Lee, Anupreeta More, Masamune Oguri   +7 more
openalex   +1 more source

Youth activism in Poland: Perceptions, participation and diverging perspectives from young people and activists

British Educational Research Journal, EarlyView.
Abstract Recent years have seen a growing scholarly interest in youth activism (YA), a phenomenon often viewed as a positive development in response to declining civic and political engagement among young people. However, most of the research focuses on the activists themselves and gives less attention to how YA is perceived by the broader youth ...
Martyna Elerian, Miri Yemini, Katarzyna Jasikowska   +2 more
wiley   +1 more source

Multimodal multi-output ordinal regression for discovering gravitationally-lensed transients

Machine Learning: Science and Technology
Gravitational lenses are caused by massive astronomical objects that distort space-time, bending light. They can distort transient astrophysical events, such as supernovae (SN), which are the subject of extensive study.
Nicolò Oreste Pinciroli Vago, Piero Fraternali   +1 more
doaj   +1 more source

Quasi-geometrical Optics Approximation in Gravitational Lensing

, 2004
The gravitational lensing of gravitational waves should be treated in the wave optics instead of the geometrical optics when the wave length $\lambda$ of the gravitational waves is larger than the Schwarzschild radius of the lens mass $M$.
Baraldo, Bartelmann, Bontz, De Paolis, De Paolis, Deguchi, Nakamura, Navarro, Ohanian, Peters, Press, R. Takahashi, Ruffa, Seto, Takahashi, Zakharov   +15 more
core   +1 more source

‘Fish in simulated water’? A Bourdieusian analysis of Chinese doctoral students' learning experiences in Southeast Asian developing countries

British Educational Research Journal, EarlyView.
Abstract International student mobility (ISM) has historically followed a pattern of movement from developing regions to developed countries. However, in recent years, there has been a noticeable increase in the number of Chinese students pursuing doctoral studies in Southeast Asian developing countries, an area that has received relatively little ...
Yueyang Zheng, Kun Dai, Alan C. K. Cheung   +2 more
wiley   +1 more source

Non-parametric inversion of gravitational lensing systems with few images using a multi-objective genetic algorithm

, 2007
Galaxies acting as gravitational lenses are surrounded by, at most, a handful of images. This apparent paucity of information forces one to make the best possible use of what information is available to invert the lens system.
Abdelsalam, Blandford, Bradač, Broadhurst, Charbonneau, Deb, Diego, H. Dejonghe, Holland, J. Liesenborgs, Keeton, Kneib, Kochanek, Koopmans, Koza, Liesenborgs, P. Bekaert, Plummer, S. De Rijcke, Saha, Saha, Schneider, Shamos   +22 more
core   +1 more source

The spread of non‐native species

Biological Reviews, EarlyView.
ABSTRACT The global redistribution of species through human agency is one of the defining ecological signatures of the Anthropocene, with biological invasions reshaping biodiversity patterns, ecosystem processes and services, and species interactions globally.
Phillip J. Haubrock, Ali Serhan Tarkan, Irene Martín‐Forés, Stelios Katsanevakis, Ronaldo Sousa, Ismael Soto, Andy J. Green, Antonín Kouba, Teun Everts, Victoria Dominguez Almela, Nadège Belouard, Cang Hui, Jamie Bojko, Victor Deklerck, Margaux Boeraeve, Franz Essl, J. Robert Britton   +16 more
wiley   +1 more source

Detecting Dark Objects with Plasma Microlensing by Their Gravitational Wakes

The Astrophysical Journal
A moving mass makes a gravitational wake in the partially ionized interstellar medium, which acts as a lens for radio-frequency light. Consequently, plasma microlensing could complement gravitational microlensing in the search for invisible massive ...
M. Sten Delos
doaj   +1 more source