Browsing by Title
Now showing items 2861-2880 of 24094
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Cheap Newton steps for optimal control problems: automatic differentiation and Pantoja's algorithm
(1999)In this paper we discuss Pantoja's construction of the Newton direction for discrete time optimal control problems. We show that automatic differentiation (AD) techniques can be used to calculate the Newton direction ... -
Checking chess checks with chunks: A model of simple check detection
(Cognitive Science Society, 2009)The procedure by which humans identify checks in check positions is not well understood. We report here our experience in modelling this process with CHREST, a general-purpose cognitive model that has previously successfully ... -
Chemical aspects related to using recycled geopolymers as aggregates
(2018-09-01)Despite extensive research into sustainability of geopolymers, end-of-life aspects have been largely overlooked. A recycling scenario is examined in this study. This requires an investigation of alkali leaching potential ... -
The chemical composition of TS 01, the most oxygen-deficient planetary nebula AGB nucleosynthesis in a metal-poor binary star
(2010)The planetary nebula TS 01 (also called PN G 135.9+55.9 or SBS 1150+599A) with its record-holding low oxygen abundance and its double degenerate close binary core (period 3.9 h) is an exceptional object located in the ... -
Chemical Composition, Structure and Physico-chemical Properties of RNA
(Wiley-Blackwell, 1992) -
Chemical denudation and silicate weathering in Himalayan glacier basins: Batura Glacier, Pakistan
(2002)The major ion, SiO2 and minor element contents of Batura Glacier meltwaters in the headwaters of the Indus Basin, Pakistan are examined. The data are used to examine the controls upon solute acquisition by runoff and to ... -
Chemical enrichment in the carbon-enhanced damped Ly α system by population III supernovae
(2011-04-01)We show that the recently observed elemental abundance pattern of the carbon-rich metal-poor damped Ly alpha (DLA) system is in excellent agreement with the nucleosynthesis yields of faint core-collapse supernovae of ... -
The chemical enrichment in the early Universe as probed by JWST via direct metallicity measurements at z~8
(2022-09-27)We analyse the chemical properties of three z~8 galaxies behind the galaxy cluster SMACS J0723.3-7327, observed as part of the Early Release Observations programme of the James Webb Space Telescope (JWST). Exploiting [O ... -
Chemical enrichment of the intracluster medium by FR II radio sources
(2007-01-21)We present 2D axisymmetric hydrodynamic simulations investigating the long-term effect of Fanaroff-Riley type II radio galaxies on the metal distribution of the surrounding intracluster medium (ICM). A light jet is injected ... -
The Chemical Evolution of Fluorine in the Bulge - High-resolution K-band spectra of giants in three fields
(2014-04-17)Possible main formation sites of F in the Universe include AGB stars, the {\nu}-process in Type II SNe, and/or W-R stars. The importance of the W-R stars has theoretically been questioned and they are probably not needed ... -
Chemical Evolution with Radial Mixing Redux: a detailed model for formation and evolution of the Milky Way
(2023-08-31)We present a multi-zone galactic chemical evolution (GCE) model for the Milky Way that takes the most recently updated yields of major nucleosynthesis channels into account. It incorporates physical processes commonly found ... -
A chemical kinetic study of low alcohol/iso-octane blends in both premixed and partially premixed combustion
(2021-04-15)The use of alcoholic fuels in both compression ignition and spark ignition engines has received much attention in recent years. Using these fuels, either in pure form or in a blended form with gasoline, not only reduces ... -
A chemical survey of exoplanets with ARIEL
(2018-11-01)Thousands of exoplanets have now been discovered with a huge range of masses, sizes and orbits: from rocky Earth-like planets to large gas giants grazing the surface of their host star. However, the essential nature of ...