Browsing Research publications by Title
Now showing items 1325-1344 of 22784
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Associative Memories with Small World Connectivity
(Springer Nature, 2005)In this paper we report experiments designed to find the relationship between the different parameters of sparsely connected networks of perceptrons with small world connectivity patterns, acting as associative memories. -
Associative memory models with structured connectivity.
(ACTA Press, 2003)High capacity associative memory models with dilute structured connectivity are trained using naturalistic bitmap patterns. The connectivity of the model is chosen to reflect the local spatial continuity of the data. The ... -
Assuring quality in transnational higher education : a matter of collaboration or control?
(2010)As transnational education collaborations increase so too do concerns about the quality of provision. To address these concerns, national codes of good practice have been written to guide exporting institutions on how to ... -
Astraeus V: the emergence and evolution of metallicity scaling relations during the epoch of reionization
(2023-01-30)In this work, we have implemented a detailed physical model of galaxy chemical enrichment into the ASTRAEUS (seminumerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body dark matter simUlationS) ... -
Astrobiological signatures: prospects for the detection of non-terrestrial biological material
(2007)The possibilities for detecting non-terrestrial biological material are briefly reviewed in light of the flurry of extrasolar planet detections over the last ten years and the forthcoming space missions designed to search ... -
Astrochemical Properties of Planck Cold Clumps
(2017-03-01)We observed thirteen Planck cold clumps with the James Clerk Maxwell Telescope/SCUBA-2 and with the Nobeyama 45 m radio telescope. The N$_2$H$^+$ distribution obtained with the Nobeyama telescope is quite similar to SCUBA-2 ... -
AstroGrid Virtual Observatory Access to Large Scale Surveys: The IPHAS Galactic Plane Survey - a Science Driven Example
(Astronomical Society of the Pacific, 2007)This paper describes how the IPHAS galactic plane survey data products are being made available utilizing the AstroGrid Virtual Observatory system (http://www.astrogrid.org). This is enabling the analysis of the large ... -
Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey - I. The Pleiades
(2012-05-01)We present the results of a deep wide-field near-infrared survey of the entire Pleiades cluster recently released as part of the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Clusters Survey (GCS) Data Release 9 (DR9). ... -
Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey - II. The Alpha Persei open cluster
(2012-11-11)We present the results of a deep (J = 19.1mag) infrared (ZYJHK) survey over the full α Per open cluster extracted from the Data Release 9 of the United Kingdom Infrared Telescope Infrared Deep Sky Survey Galactic Clusters ... -
Astrometric and photometric initial mass functions from the UKIDSS Galactic Clusters Survey - III. Praesepe
(2012-11-11)Over the past decades open clusters have been the subject of many studies. Such studies are crucial considering that the universality of the initial mass function is still a subject of current investigations. Praesepe is ... -
Astronometry with the Hubble Space Telescope : trigonometric parallaxes of planetary nebula nuclei NGC 6853, NGC 7293, Abell 31 and DeHt 5
(2009)We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae NGC 6853 (The Dumbbell), NGC 7293 (The Helix), Abell 31, and DeHt 5. This paper details our reduction and analysis ... -
Astronomia ex machina: a history, primer and outlook on neural networks in astronomy
(2023-05-31)In this review, we explore the historical development and future prospects of artificial intelligence (AI) and deep learning in astronomy. We trace the evolution of connectionism in astronomy through its three waves, from ... -
Astrophysical analysis of the measurement of (alpha,gamma) and (alpha,n) cross sections of Tm-169
(2012-07-05)Reaction cross sections of Tm-169(alpha, gamma)Lu-173 and Tm-169(alpha, n)Lu-172 have been measured in the energy range 12.6 -
Astrophysical and nuclear physics aspects of the r-process
(World Scientific Publishing, 1998)The formation of elements as heavy as Th and U and beyond is due to the rapid neutron-capture process (r-process), which causes the production of highly unstable nuclei near the neutron drip-line and functions via neutron ... -
Astrophysical conditions for an r-process in the high-entropy wind scenario of type II supernovae
(2005-07-25)Within a full dynamical parameter study including freezeout effects, we have determined the astrophysical conditions for an r-process in the so-called "neutrino-wind" scenario of core-collapse type II supernovae (SNII). ... -
The astrophysical r-process : A comparison of calculations following adiabatic expansion with classical calculations based on neutron densities and temperatures
(1999-05-01)The rapid neutron-capture process (r-process) encounters unstable nuclei far from beta-stability. Therefore its observable features, like the abundances, witness (still uncertain) nuclear structure as well as the conditions ... -
Astrophysical Rates for Explosive Nucleosynthesis : Stellar and Laboratory Rates for Exotic Nuclei
(2010-03-01)A selected overview of stellar effects and reaction mechanisms with relevance to the prediction of astrophysical reaction rates far off stability is provided. -
Astrophysical reaction rate for the Li-8(n,gamma)Li-9 reaction
(2003-01)An attempt was made to measure the excitation function of the cross section for the Li-8(n,gamma)Li-9 reaction by performing the inverse reaction Li-9(gamma,n)Li-8, with the equivalent photons in the electric field of ... -
Astrophysical Reaction Rates as a Challenge for Nuclear Reaction Theory
(American Institute of Physics (AIP), 2010)The relevant energy ranges for stellar nuclear reactions are introduced. Low-energy compound and direct reactions are discussed. Stellar modifications of the cross sections are presented. Implications for experiments are outlined. -
Astrophysical reaction rates for B-10(p,alpha)Be-7 and B-11(p,alpha)Be-8 from a direct model
(1996-05)The reactions B-10(p,alpha)Be-7 and B-11(p,alpha)Be-8 are studied at thermonuclear energies using DWBA calculations. For both reactions, transitions to the ground states and first excited states are investigated. In the ...