5,738 research outputs found
4. Bagnal L. (Roger S.), Frier (Bruce W.), Rutherford (Ian C), The Census Register P. Oxy, 984 : The Reverse of Pindar's Paeans
No full textHusson Geneviève. 4. Bagnal L. (Roger S.), Frier (Bruce W.), Rutherford (Ian C), The Census Register P. Oxy, 984 : The Reverse of Pindar's Paeans. In: Revue des Études Grecques, tome 111, Juillet-décembre 1998. pp. 761-762
Depth dependent elastic strain in ZnO epilayer: combined Rutherford backscattering/channeling and X-ray diffraction
No full textA ZnO layer was grown by metalorganic chemical vapor deposition (MOCVD) on a sapphire (0 0 0 1) substrate. The perpendicular and parallel elastic strain of the ZnO epilayer, e(perpendicular to) = 0.19%, e(parallel to) = -0.29%, respectively, were derived by using the combination of Rutherford backscattering (RBS)/channeling and X-ray diffraction (XRD). The ratio vertical bar e(parallel to)/ e(perpendicular to)vertical bar = 1.5 indicates that ZnO layer is much stiffer in the a-axis direction than in the c-axis direction. By using RBS/C, the depth dependent elastic strain was deduced. The strain is higher at the depth close to the interface and decreases towards the surface. The negative tetragonal distortion was explained by considering the lattice mismatch and thermal mismatch in ZnO thin film. (c) 2004 Elsevier B.V. All rights reserved
sj-docx-1-eso-10.1177_23969873231173282 – Supplemental material for Sex differences in associations between creatinine and cystatin C-based kidney function measures with stroke and major bleeding
No full textSupplemental material, sj-docx-1-eso-10.1177_23969873231173282 for Sex differences in associations between creatinine and cystatin C-based kidney function measures with stroke and major bleeding by Jennifer Susan Lees, Nicole L De La Mata, Michael K Sullivan, Melanie L Wyld, Brenda M Rosales, Rachel Cutting, James Alan Hedley, Elaine Rutherford, Patrick Barry Mark and Angela C Webster in European Stroke Journal</p
Composition and luminescence studies of InGaN epilayers grown at different hydrogen flow rates
No full textIndium gallium nitride (In(x)Ga(1-x)N) is a technologically important material for many optoelectronic devices, including LEDs and solar cells, but it remains a challenge to incorporate high levels of InN into the alloy while maintaining sample quality. A series of InGaN epilayers was grown with different hydrogen flow rates (0-200 sccm) and growth temperatures (680-750 °C) to obtain various InN fractions and bright emission in the range 390-480 nm. These 160-nm thick epilayers were characterized through several compositional techniques (wavelength dispersive x-ray spectroscopy, x-ray diffraction, Rutherford backscattering spectrometry) and cathodoluminescence hyperspectral imaging. The compositional analysis with the different techniques shows good agreement when taking into account compositional gradients evidenced in these layers. The addition of small amounts of hydrogen to the gas flow at lower growth temperatures is shown to maintain a high surface quality and luminescence homogeneity. This allowed InN fractions of up to ~16% to be incorporated with minimal peak energy variations over a mapped area while keeping a high material quality
The Impacts of Contract Type on Broker Performance: Submarket Effects
No full textRutherford et al. (2001) develop and empirically test a model that analyzes the effect the type of listing contract, either exclusive agency (EA) or exclusive right to sell (ERTS), has on the performance of the agent/broker. This paper extends the work of Rutherford et al. (2001) and looks at differences between housing submarkets delineated by price. The results show a selling price discount associated with both broker-effected and owner-effected sales for lower-priced houses with EA contracts. For higher-priced houses, there is no price advantage to an EA-listing if the broker achieves the sale, but if the owner sells the house, there is a modest price premium associated with the sale. The primary implication of the results is that owners of lower-priced houses should be wary of alternative listing arrangements, namely exclusive agency contracts.
Photography as an act of collaboration
No full textThe camera is usually considered to be a passive tool under the control of the operator. This definition implicitly constrains how we use the medium, as well as how we look at – and what we see in – its interpretations of scenes, objects, events and ‘moments’. This text will suggest another way of thinking about – and using – the photographic medium. Based on the evidence of photographic practice (mine and others’), I will suggest that, as a result of the ways in which the medium interprets, juxtaposes and renders the elements in front of the lens, the camera is capable of depicting scenes, events and moments that did not exist and could not have existed until brought into being by the act of photographing them. Accordingly, I will propose that the affective power of many photographs is inseparable from their ‘photographicness’ – and that the photographic medium should therefore be considered as an active collaborator in the creation of uniquely photographic images
Early atomic models - from mechanical to quantum (1904-1913)
No full textA complete history of early atomic models would fill volumes, but a reasonably coherent tale of the path from mechanical atoms to the quantum can be told by focusing on the relevant work of three great contributors to atomic physics, in the critically important years between 1904 and 1913: J.J. Thomson, Ernest Rutherford and Niels Bohr. We first examine the origins of Thomson’s mechanical atomic models, from his ethereal vortex atoms in the early 1880’s, to the myriad “corpuscular” atoms he proposed following the discovery of the electron in 1897. Beyond qualitative predictions for the periodicity of the elements, the application of Thomson’s atoms to problems in scattering and absorption led to quantitative predictions that were confirmed by experiments with high-velocity electrons traversing thin sheets of metal. Still, the much more massive and energetic α-particles being studied by Rutherford were better suited for exploring the interior of the atom, and careful measurements on the angular dependence of their scattering eventually allowed him to infer the existence of an atomic nucleus. Niels Bohr was particularly troubled by the radiative instability inherent to any mechanical atom, and succeeded in 1913 where others had failed in the prediction of emission spectra, by making two bold hypotheses that were in contradiction to the laws of classical physics, but necessary in order to account for experimental facts.Peer reviewe
Analysis of losses in superconducting magnets based on the Nb3Sn Rutherford cable configuration for future gantries
No full textProton therapy for the treatment of cancers adopts a rotating gantry to irradiate the tumor from any direction. The gantry system consists of different beamline magnets that bend the proton beam towards the patient. The use of superconducting magnets allows reducing the size and weight of the last bending section. During the gantry operation, it is necessary to change the magnetic field of the last bending section in order to vary the proton penetration depth. This change determines electrodynamic transients in the superconducting strands and cables that generate losses. A thorough computation of these losses is essential for a safe design of the cryogenic system. Two main types of losses must be accounted for when dealing with multistrand superconducting cables, related to the magnetization and coupling of the superconducting filaments (intrastrand losses) and to the current loops induced between different strands during electrodynamic transients (interstrand losses). This work describes the methodologies and numerical codes adopted to compute the hysteresis and coupling losses in an innovative magnet system designed by the Paul Scherrer Institute for future superconducting gantries. In this design the superconducting coils are wound using Nb3Sn Rutherford cables. The validation of the numerical tools versus analytical results is presented for simplified cases with uniform magnetic flux density applied to the conductor. The results of the losses calculation and the impact of the different contributions are then presented for the actual proposed magnet system configuration
Billeroo North alkaline magmatic complex: geology and economic significance
No full textLachlan Rutherford, Andrew C. Burtt, Karin M. Barovich, Martin Hand and John Fode
Quasielastic scattering of He-6 from C-12 at 82.3 MeV/nucleon
No full textQuasielastic scattering of He-6 on a C-12 target was measured at 82.3 MeV/nucleon. Special care was taken to treat the background subtraction at very small angles. The measured differential cross-sections show a large enhancement at small angles relative to the Rutherford cross-section, similar to those observed at lower energies for the scattering of halo nuclei. The overall structure of the cross-section is reasonably reproduced by the optical model calculations. The inelastic channels which populate two low-lying excited states of C-12 target nucleus were included in the framework of the coupled channel analysis. Further systematic theoretical analysis is encouraged.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000288695800002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Physics, NuclearSCI(E)12ARTICLE3null8
- …
