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Search Results: 1 - 10 of 6784 matches for " Malcolm Brown "
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The Case for a Learning Space Performance Rating System
Elliot Felix,Malcolm Brown
Journal of Learning Spaces , 2011,
Abstract: Learning spaces are mission-critical for colleges and universities. Yet institutions lack a commonly accepted set of standards for learning spaces, lack a way to measure how well they work through a third-party certification, and lack a substantive way to compare their spaces to peer and aspirant institutions. Inspired by the success of environmental building rating systems, this paper makes the case for a Learning Space Performance Rating System and describes the development of such as system – currently in its early stages – so as to enlist broader interest and support in the initiative.
Hyperspectral imaging spectroscopy of a Mars analogue environment at the North Pole Dome, Pilbara Craton, Western Australia
Adrian J. Brown,Malcolm Walter,Thomas Cudahy
Physics , 2014, DOI: 10.1080/08120090500134530
Abstract: A visible and near infrared (VNIR) to shortwave infrared (SWIR) hyperspectral dataset of the Early Archaean North Pole Dome, Pilbara Craton, Western Australia, has been analysed for indications of hydrothermal alteration. Occurrence maps of hydrothermal alteration minerals were produced. It was found that using a spatial resolution on the ground of approximately 5 m and spectral coverage from 0.4 to 2.5 mm was sufficient to delineate several hydrothermal alteration zones and associated veins, including phyllic, serpentinitic and chloritic alteration. These results suggest this level of spectral and spatial resolution would be ideal for localising shallow epithermal activity, should such activity have existed, on the surface of Mars.
SWIR Investigation of sites of astrobiological interest
Adrian J. Brown,Malcolm Walter,Thomas Cudahy
Physics , 2014, DOI: 10.1089/ast.2004.4.359
Abstract: Rover missions to the rocky bodies of the Solar System and especially to Mars require light- weight, portable instruments that use minimal power, require no sample preparation, and provide suitably diagnostic mineralogical information to an Earth-based exploration team. Short-wave infrared (SWIR) spectroscopic instruments such as the Portable Infrared Mineral Analyser (PIMA, Integrated Spectronics Pty Ltd., Baulkham Hills, NSW, Australia) fulfill all these requirements. We describe an investigation of a possible Mars analogue site using a PIMA instrument. A survey was carried out on the Strelley Pool Chert, an outcrop of stro- matolitic, silicified Archean carbonate and clastic succession in the Pilbara Craton, interpreted as being modified by hydrothermal processes. The results of this study demonstrate the ca- pability of SWIR techniques to add significantly to the geological interpretation of such hy- drothermally altered outcrops. Minerals identified include dolomite, white micas such as il- lite-muscovite, and chlorite. In addition, the detection of pyrophyllite in a bleached and altered unit directly beneath the succession suggests acidic, sulfur-rich hydrothermal activity may have interacted with the silicified sediments of the Strelley Pool Chert.
Uniqueness for an inverse problem in electromagnetism with partial data
Malcolm Brown,Marco Marletta,Juan Manuel Reyes
Mathematics , 2014,
Abstract: A uniqueness result for the recovery of the electric and magnetic coefficients in the time-harmonic Maxwell equations from local boundary measurements is proven. No special geometrical condition is imposed on the inaccessible part of the boundary of the domain, apart from imposing that the boundary of the domain is $C^{1,1}$. The coefficients are assumed to coincide on a neighbourhood of the boundary, a natural property in applications.
Convergence of regular approximations to the spectra of singular fourth order Sturm-Liouville problems
Malcolm Brown,Leon Greenberg,Marco Marletta
Mathematics , 1998,
Abstract: We prove some new results which justify the use of interval truncation as a means of regularising a singular fourth order Sturm-Liouville problem near a singular endpoint. Of particular interest are the results in the so called lim-3 case, which has no analogue in second order singular problems.
A right inverse of the Askey-Wilson operator
B. Malcolm Brown,Mourad E. H. Ismail
Mathematics , 1993,
Abstract: We establish an integral representation of a right inverse of the Askey-Wilson finite difference operator on $L^2$ with weight $(1-x^2)^{-1/2}$. The kernel of this integral operator is $\vartheta'_4/\vartheta_4$ and is the Riemann mapping function that maps the open unit disc conformally onto the interior of an ellipse.
Asymmetries of Demand for Money Functions Amongst EMU Countries
Philip Arestis,Iris Biefang Frisancho Mariscal,Andrew Brown,Malcolm Sawyer
Investigación económica , 2003,
Abstract: El Banco Central Europeo (BCE) emplea dos pilares estratégicos para lograr su objetivo de estabilidad de precios dentro la zona del euro. Aun en ausencia de un objetivo monetario explicito, la estabilidad de la relación entre el dinero y los precios mantiene los efectos del papel de los agregados monetarios en la conducción de la política monetaria. La estabilidad de la relación dinero-precios depende a la larga de las propiedades de la demanda por dinero. Este artículo se ocupa de las funciones de la demanda por dinero en los distintos países de la Unión Monetaria Europea, de si tales funciones de demanda pueden ser identificadas, y en caso de que lo sean, si las funciones serán similares en los diferentes países. Un cambio en la tasa de interés del BCE provocaría un cambio idéntico en la tasa de interés en el corto plazo para todos los países de la Unión. Como una consecuencia, el costo de prestar podría además cambiar, lo cual afectará la demanda de préstamos del banco. El tama o del efecto resultante puede variar de país a país, dependiendo del marco institucional, y ello puede dar lugar a asimetrías en los mecanismos monetarios. Los autores encuentran diferencias significativas en la semi-elasticidad de la tasa de interés de país a país dentro de la Unión: los autores argumentan que esto puede ocasionar serios problemas en la conducción de la política monetaria común por parte del BCE.
Hydrothermal alteration at the Panorama Formation, North Pole Dome, Pilbara Craton, Western Australia
Adrian J. Brown,Thomas J. Cudahy,Malcolm R. Walter
Physics , 2014, DOI: 10.1016/j.precamres.2006.08.014
Abstract: An airborne hyperspectral remote sensing dataset was obtained of the North Pole Dome region of the Pilbara Craton in October 2002. It has been analyzed for indications of hydrothermal minerals. Here we report on the identification and mapping of hydrothermal minerals in the 3.459 Ga Panorama Formation and surrounding strata. The spatial distribution of a pattern of subvertical pyrophyllite rich veins connected to a pyrophyllite rich palaeohorizontal layer is interpreted to represent the base of an acid-sulfate epithermal system that is unconformably overlain by the stromatolitic 3.42 Ga Strelley Pool Chert.
Gap localization of TE-Modes by arbitrarily weak defects
Malcolm Brown,Vu Hoang,Michael Plum,Maria Radosz,Ian Wood
Physics , 2015,
Abstract: This paper considers the propagation of TE-modes in photonic crystal waveguides. The waveguide is created by introducing a linear defect into a periodic background medium. Both the periodic background problem and the perturbed problem are modelled by a divergence type equation. A feature of our analysis is that we allow discontinuities in the coefficients of the operator, which is required to model many photonic crystals. It is shown that arbitrarily weak perturbations introduce spectrum into the spectral gaps of the background operator.
Boundary triplets and M-functions for non-selfadjoint operators, with applications to elliptic PDEs and block operator matrices
Malcolm Brown,Marco Marletta,Serguei Naboko,Ian Wood
Mathematics , 2007, DOI: 10.1112/jlms/jdn006
Abstract: Starting with an adjoint pair of operators, under suitable abstract versions of standard PDE hypotheses, we consider the Weyl M-function of extensions of the operators. The extensions are determined by abstract boundary conditions and we establish results on the relationship between the M-function as an analytic function of a spectral parameter and the spectrum of the extension. We also give an example where the M-function does not contain the whole spectral information of the resolvent, and show that the results can be applied to elliptic PDEs where the M-function corresponds to the Dirichlet to Neumann map.
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