Browsing Faculty of Arts and Sciences by Title
Now showing items 6472-6491 of 24540
-
Energy flows in thick accretion discs and their consequences for black hole feedback
(Oxford University Press (OUP), 2016)We study energy flows in geometrically thick accretion discs, both optically thick and thin, using general relativistic, three-dimensional simulations of black hole accretion flows. We find that for non-rotating black holes ... -
Energy Injection in Gamma-Ray Burst Afterglows
(IOP Publishing, 2015)We present multi-wavelength observations and modeling of Gamma-ray Bursts (GRBs) that exhibit a simultaneous re-brightening in their X-ray and optical light curves, and are also detected at radio wavelengths. We show that ... -
Energy input from quasars regulates the growth and activity of black holes and their host galaxies
(Nature Research (part of Springer Nature), 2005)In the early Universe, while galaxies were still forming, black holes as massive as a billion solar masses powered quasars. Supermassive black holes are found at the centres of most galaxies today(1 - 3), where their masses ... -
The energy penalty of post-combustion CO2 capture & storage and its implications for retrofitting the U.S. installed base
(Royal Society of Chemistry (RSC), 2009)A review of the literature has found a factor of 4 spread in the estimated values of the energy penalty for post-combustion capture and storage of CO2 from pulverized-coal (PC) fired power plants. We elucidate the cause ... -
Energy Pooling and Implications for the Unique Traits of the Human Life History Strategy
(John Wiley & Sons, 2009)Compared to non-human primates, human life history is characterized by slow juvenile growth, late age at maturity, short interbirth intervals, and a decoupling of reproductive senescence and somatic senescence. Some of ... -
Energy rate density as a complexity metric and evolutionary driver
(Wiley-Blackwell, 2010)The proposition that complexity generally increases with evolution seems indisputable. Both developmental and generational changes often display a rise in the number and diversity of properties describing a wide spectrum ... -
Energy rate density. II. Probing further a new complexity metric
(Wiley-Blackwell, 2011)Appraisal of the concept of energy rate density continues, as both a potential quantitative metric for complexity studies and a key feature of a unifying hypothesis for the origin and evolution of material systems throughout ... -
Energy Relaxation In Collisions Of Hydrogen And Deuterium With Oxygen Atoms
(American Geophysical Union, 2009)Collision energy transfer processes between hydrogen, deuterium, and oxygen atoms in the upper atmospheres of the terrestrial planets are studied. A new set of interaction potentials has been constructed using an accurate ... -
Energy Saving Potential of Natural Ventilation in China: The Impact of Ambient Air Pollution
(Elsevier BV, 2016)Natural ventilation (NV) is a key sustainable solution for reducing the energy use in buildings, improving thermal comfort, and maintaining a healthy indoor environment. However, the energy savings and environmental benefits ... -
Energy Spectra and High-Frequency Oscillations in 4U 0614+091
(American Astronomical Society, 1997)We investigate the behavior of the high-frequency quasi-periodic oscillations (QPOs) in 4U 0614+091, combining timing and spectral analyses of RXTE observations. The energy spectra of the source can be described by a power ... -
Energy Transfer in O Collisions with He Isotopes and Helium Escape from Mars
(Wiley-Blackwell, 2011)[1] Accurate data on energy-transfer collisions between hot oxygen atoms and the atmospheric helium gas on Mars, are reported. Anisotropic cross sections for elastic collisions of O(3P) and O(1D) atoms with helium gas have ... -
Energy transfer mediated by asymmetric hydrogen-bonded interfaces
(Royal Society of Chemistry (RSC), 2012)Amidine-appended ferrocene derivatives form a supramolecular assembly with Ru(ii)(bpy-COOH) (L)22+ complexes (bpy-COOH is 4-CO2H-4′-CH3-bpy and L = bpy, 2,2′-bipyridine or btfmbpy, 4,4′-bis (trifluoromethyl)-2,2′-bipyridine). ... -
Energy transfer of CdSe/ZnS nanocrystals encapsulated with rhodamine-dye functionalized poly(acrylic acid)
(Elsevier BV, 2012)Energy transfer between a CdSe/ZnS nanocrystal (NC) donor and a rhodamine isothiocyanate (RITC) acceptor has been achieved via a functionalized poly(acrylic acid) (PAA) encapsulating layer over the surface of the NC. The ... -
Energy, momentum and mass outflows and feedback from thick accretion discs around rotating black holes
(Oxford University Press, 2013)Using long-duration general relativistic magnetohydrodynamic simulations of radiatively inefficient accretion discs, the energy, momentum and mass outflow rates from such systems are estimated. Outflows occur via two fairly ... -
Energy-Resolved Positron Annihilation in Flight in Solid Targets
(American Physical Society (APS), 1999)Energy-resolved two-quantum annihilation in flight of positrons with energies ranging from 10 to 71.6 keV was observed. An energy-dispersive two-detector coincidence system was used to observe the sum and difference energies ... -
Enforced Presentation of an Extrahelical Guanine to the Lesion Recognition Pocket of Human 8-Oxoguanine Glycosylase, hOGG1
(American Society for Biochemistry and Molecular Biology, 2012)A poorly understood aspect of DNA repair proteins is their ability to identify exceedingly rare sites of damage embedded in a large excess of nearly identical undamaged DNA, while catalyzing repair only at the damaged ... -
Enforcement Is Central to the Evolution of Cooperation
(Springer Science and Business Media LLC, 2019-06-24)Cooperation occurs at all levels of life, from genomes, complex cells and multicellular organisms to societies and mutualisms between species. A major question for evolutionary biology is what these diverse systems have ... -
Enforcement of Civil Rights Law in Private Workplaces: The Effects of Compliance Reviews and Lawsuits Over Time
(Wiley-Blackwell, 2006)Has federal antidiscrimination law been effective in moving women and minorities into management? Early studies show that government affirmative action reviews improved the numbers, and rank, of blacks, but evidence of ... -
Engagement, Gentrification, and the Neoliberal Hijacking of History
(University of Chicago Press, 2010)Drawing primarily on fieldwork in Greece, Italy, and Thailand, I examine the use of historic conservation to justify gentrification. This commoditization of history expands into urban design a classification that serves ... -
Engaging Chiral Cationic Intermediates by Anion-Binding in Asymmetric Catalysis
(2016-01-13)Anion-binding catalysis by dual hydrogen-bond donors such as ureas and squaramides has been demonstrated as a powerful strategy for the development of highly enantioselective transformations involving prochiral cationic ...