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Search Results: 1 - 10 of 16093 matches for " Bernard Smith "
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The ‘Greening’ of Natural Stone Buildings:Quartz Sandstone Performance as a Secondary Indicator of Climate Change in the British Isles?  [PDF]
Stephen McCabe, Bernard Smith, Catherine Adamson, Donal Mullan, Daniel McAllister
Atmospheric and Climate Sciences (ACS) , 2011, DOI: 10.4236/acs.2011.14018
Abstract: A number of recent studies have explored the impact of climate change on natural building stones. Because of its sensitivity to change, sandstone can be seen as having a predictable, recognisable and sustained response to changes in system inputs that control performance – most crucially for the UK and Ireland, how it responds to an increased moisture input. There has been a widespread biological “greening” of sandstone buildings in response to these periods of wetness during autumn, winter and spring months. Furthermore, there is a wealth of literature detailing the response of sandstone in a variety of environments where sand-stone response is representative of the environment in which it has been placed. This letter suggests that the response of sandstone to trends towards wetter winter conditions is predictable to the extent that it may have potential to be a secondary indicator of climatic change – that is, a system that alters in response to fluctuations in environmental conditions in a sustained way. It is hoped that the letter may stimulate discussion as to what other possible indicators of climatic change remain unacknowledged.
Phosphorus Mass Balance of the Illinois River Watershed in Arkansas and Oklahoma  [PDF]
Bernard Engel, Meagan Smith, John Berton Fisher, Roger Olsen, Laurent Ahiablame
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.56060
Abstract:

Water quality degradation in the Illinois River Watershed (IRW) has been linked to excess nutrients, primarily phosphorus (P). A mass balance study was performed on the IRW in Oklahoma and Arkansas to quantify the magnitude of P entering the watershed between the closure of Lake Tenkiller’s dam in 1954 to 2006. Results showed that a substantial mass of P was, and is, being imported into the watershed relative to the mass of P leaving the watershed. The study demonstrated that poultry production has been the major contributor of P imported to the watershed since 1964, and is currently responsible for more than 76% of the net annual P additions to the IRW. Between 1949 and 2002, more than 200,000 tonnes of P was added to the IRW. A P delivery ratio for the IRW was computed from the mass balance results and observed loads indicating that 4% of annual P applied to the IRW landscape reached Lake Tenkiller between 1999 and 2006. Allocation of P loads from 1949 to 2002 to Lake Tenkiller computed with the delivery ratio showed that wastewater treatment plant (WWTP) discharges were responsible for more than 50% of P reaching Lake Tenkiller in 1949, followed by dairy cattle (32% of loads). Poultry contribution to P reaching Lake Tenkiller was 5% in 1949 but increased rapidly to become the largest source in 1969 at approximately 49%, and in 2002 at 54%. Both dairy and WWTP portions of the loads declined from 1949 levels with less than 4% attributable to dairy and less than 34% assigned to WWTP in 2002.

Interesting Features in the Combined GALEX and Sloan Color Diagrams of Solar-like Galactic Populations
Myron Smith,Luciana Bianchi,Bernard Shiao
Physics , 2014, DOI: 10.1088/0004-6256/147/6/159
Abstract: We report on intriguing photometric properties of Galactic stars observed in the GALEX satellite's far-UV and near-UV bandbasses as well as from the SDSS survey and the Kepler Input Catalog. First, the FUV-NUV color distribution of stars in the Kepler field consists of 2 distinct peaks. Second, curiously, for stars with spectral types G or later the mean FUV-NUV color becomes much bluer, contrary to expectation. we have found in two samples of mid-F through K type stars that ~14-18% of them exhibit FUV-excesses relative to their NUV fluxes and spectral types. Nearly the same fractions are also discovered among members of the Kepler Eclipsing Binary Catalog and in the published list of Kepler Objects of Interest. These UV-excess ("UVe") colors are confirmed by the UV continuum slopes in GALEX spectra. The SDSS spectra of some UVe stars exhibit metallic line weakening especially in the blue. This suggests an enhanced contribution of UV flux relative to photospheric flux of a solar-type single star. We consider the possibility that the UV excesses originate from various types of hot stars, including binaries, and strong chromosphere stars that. Our model atmosphere-derived simulations of colors for binaries with main sequence pairs with a hot secondary demonstrate that the color loci conflict with the observed sequence. We are left with the active chromospheres explanation, whether in active binaries or young stars, as a still tentative explanation for the UVe stars. We also address the presence of an island of "UV red" stars in the NUV-g, g-i color diagram. The subpopulation comprising this island are mainly horizontal branch stars. These objects do not exhibit UV excesses and therefore have UV colors typical for their spectral types. This subpopulation appears "red" in the UV because their colors are not pulled to the blue by the UVe stars.
Language of Evaluation: How PLA Evaluators Write about Student Learning
Nan L. Travers,Bernard Smith,Leslie Ellis,Tom Brady
International Review of Research in Open and Distance Learning , 2011,
Abstract: Very few studies (e.g., Arnold, 1998; Joosten-ten Brinke, et al., 2009) have examined the ways in which evaluators assess students’ prior learning. This investigation explored the ways that evaluators described students’ prior learning in final assessment reports at a single, multiple-location institution. Results found four themes; audience, voice, presentation of the learning, and evaluation language. Within each theme, further sub-themes are defined. These results are significant for training evaluators on how to discuss student learning and for institutions to consider in relationship to the purpose behind the evaluations. Further research and implications are discussed.
Experimental and computational characterization of a modified GEC cell for dusty plasma experiments
Victor Land,Erica Shen,Bernard Smith,Lorin Matthews,Truell Hyde
Physics , 2009, DOI: 10.1088/1367-2630/11/6/063024
Abstract: A self-consistent fluid model developed for simulations of micro- gravity dusty plasma experiments has for the first time been used to model asymmetric dusty plasma experiments in a modified GEC reference cell with gravity. The numerical results are directly compared with experimental data and the experimentally determined dependence of global discharge parameters on the applied driving potential and neutral gas pressure is found to be well matched by the model. The local profiles important for dust particle transport are studied and compared with experimentally determined profiles. The radial forces in the midplane are presented for the different discharge settings. The differences between the results obtained in the modified GEC cell and the results first reported for the original GEC reference cell are pointed out.
Probing the sheat electric field using thermophoresis in dusty plasma. Part II: Experimental measurements
Victor Land,Bernard Smith,Lorin Matthews,Truell Hyde
Physics , 2009,
Abstract: A two-dimensional dust crystal levitated in the sheath of a modified Gaseous Electronics Conference (GEC) reference cell is manipulated by heating or cooling the lower electrode. The dust charge is obtained from top-view pictures of the crystal using a previously developed analytical model. By assuming a simple force balance, and measuring the radial confining force, the vertical electric field profile in the sheath is reconstructed. The dust crystal is shown to levitate on the plasma side of the Bohm point. Finally, it is shown that the ion drag plays an important role in the vertical force balance, even for large dust grains.
NASA's Next Generation Space Telescope:Visiting a Time When Galaxies Were Young
Bernard D. Seery,Eric P. Smith,John C. Mather
Physics , 1998, DOI: 10.1364/OPN.9.7.000029
Abstract: With the discovery of galaxies that existed when the universe was very young (approximately 5 percent of its current age), of planets not in our own solar system, and with the tantalizing evidence that the conditions for life may have existed within our solar system on planets or moons outside of the earth system, the past year has seen an explosion of interest in astronomy. In particular, a new era of exploration and understanding seems imminent, where the connection between the existence for the conditions of life will be connected to the origin of galaxies, stars and planets within the Universe. Who knows where this quest for knowledge will take us? Keywords: Active Optics, Next Generation Space Telescope, Deployables, Detectors, NGST.
Probing the sheath electric field with a crystal lattice by using thermophoresis in dusty plasma
Victor Land,Bernard Smith,Lorin Matthews,Truell Hyde
Physics , 2010, DOI: 10.1109/TPS.2009.2034663
Abstract: A two-dimensional dust crystal levitated in the sheath of a modified Gaseous Electronics Conference (GEC) reference cell is manipulated by heating or cooling the lower electrode. The dust charge is obtained by measuring global characteristics of the levitated crystal obtained from top-view pictures. From the force balance, the electric field in the sheath is reconstructed. From the Bohm criterion, we conclude that the dust crystal is levitated mainly above and just below the classical Bohm point.
The Linear KdV Equation with an Interface
Bernard Deconinck,Natalie E. Sheils,David A. Smith
Mathematics , 2015,
Abstract: The interface problem for the linear Korteweg-de Vries (KdV) equation in one-dimensional piecewise homogeneous domains is examined by constructing an explicit solution in each domain. The location of the interface is known and a number of compatibility conditions at the boundary are imposed. We provide an explicit characterization of sufficient interface conditions for the construction of a solution using Fokas's Unified Transform Method. The problem and the method considered here extend that of earlier papers to problems with more than two spatial derivatives.
New Formulas for Irregular Sampling of Two-Bands Signals  [PDF]
Bernard Lacaze
Journal of Signal and Information Processing (JSIP) , 2011, DOI: 10.4236/jsip.2011.24035
Abstract: Many sampling formulas are available for processes in baseband (-a,a) at the Nyquist rate a/π. However signals of telecommunications have power spectra which occupate two bands or more. We know that PNS (periodic non-uniform sampling) allow an errorless reconstruction at rate smaller than the Nyquist one. For instance PNS2 can be used in the two-bands case (-a,-b)∪(b,a) at the Landau rate (a-b)/π We prove a set of formulas which are available in cases more general than the PNS2. They take into account two sampling sequences which can be periodic or not and with same mean rate or not.
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