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Search Results: 1 - 10 of 222215 matches for " Virginia C Gould "
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Exploring the industrial placement experience for mechanical engineering undergraduates
Gary Lock,Kate Bullock,Virginia Gould,Momna Hejmadi
Engineering Education , 2009,
Abstract: This paper explores the attitudes of undergraduate engineers towards work placements in industry. This research also assesses the placement experience in terms of student learning outcomes and future employment aspirations. Quantitative and qualitative data were collected from three groups: (i) those recently returning from a placement; (ii) those yet to go on placement and (iii) those who elected not to go on placement. Semi-structured interviews gathered experiences and perceptions from all three groups and formed the basis of attitude questionnaires distributed to 276 undergraduates at the University of Bath. Students were asked what value they attached to a year in industry, what improvement in personal transferable skills (such as team-working, time-management, communication and learning) they felt was gained and their perception of the placement experience in terms of aspirations of future employment. Factors influencing the decision of whether or not to undertake a placement were explored. The marks of the students in each of the three populations were scrutinised in order to determine any academic differences between the groups and to assess any value added by a placement in terms of improved performance on returning to university. Finally, this paper identifies reasons why undergraduates do not elect to undertake placements, asking if these important decisions are well-informed or otherwise.
Optical-Model Description of Time-Reversal Violation
V. Hnizdo,C. R. Gould
Physics , 1993, DOI: 10.1103/PhysRevC.49.R612
Abstract: A time-reversal-violating spin-correlation coefficient in the total cross section for polarized neutrons incident on a tensor rank-2 polarized target is calculated by assuming a time-reversal-noninvariant, parity-conserving ``five-fold" interaction in the neutron-nucleus optical potential. Results are presented for the system $n + {^{165}{\rm Ho}}$ for neutron incident energies covering the range 1--20 MeV. From existing experimental bounds, a strength of $2 \pm 10$ keV is deduced for the real and imaginary parts of the five-fold term, which implies an upper bound of order $10^{-4}$ on the relative $T$-odd strength when compared to the central real optical potential.
Sgr A* Companion S0-2: A Probe of Very High-Mass Star Formation
Andrew Gould,Alice C. Quillen
Physics , 2003, DOI: 10.1086/375840
Abstract: The star S0-2, which is orbiting Sgr A* with a 15-yr period, almost certainly did not form in situ. We propose that it was injected into this close orbit by the tidal disruption of a massive-star binary, whose primary was more massive than S0-2 and at least 60 Msun. From numerical integrations we find that 1-2% of incoming binaries with closest approach equal to 130 AU leave the secondary in an orbit with eccentricity within 0.01 of that of SO-2. If additional stars are found orbiting Sgr A* with relatively short periods, they could be used to probe the formation of massive stars in the Galactocentric region, even though the massive stars themselves have long since perished.
Cheap Space-Based Microlens Parallaxes for High-Magnification Events
Andrew Gould,Jennifer C. Yee
Physics , 2012, DOI: 10.1088/2041-8205/755/1/L17
Abstract: We show that for high-magnification (Amax > 100) microlensing events, accurate microlens parallaxes can be obtained from three or fewer photometric measurements from a small telescope on a satellite in solar orbit at ~1 AU from Earth. This is 1--2 orders of magnitude less observing resources than are required for standard space-based parallaxes. Such microlens parallax measurements would yield accurate mass and distance measurements to the lens for all cases in which finite-source effects were observed from the ground over peak. This would include virtually all high-magnification events with detected planets and a substantial fraction of those without. Hence it would permit accurate estimates of the Galactic distribution of planets.
Microlens Masses From Astrometry and Parallax in Space-Based Surveys: From Planets to Black Holes
Andrew Gould,Jennifer C. Yee
Physics , 2014, DOI: 10.1088/0004-637X/784/1/64
Abstract: We show that space-based microlensing experiments can recover lens masses and distances for a large fraction of all events (those with individual photometric errors <~ 0.01 mag) using a combination of one-dimensional microlens parallaxes and astrometric microlensing. This will provide a powerful probe of the mass distributions of planets, black holes, and neutron stars, the distribution of planets as a function of Galactic environment, and the velocity distributions of black holes and neutron stars. While systematics are in principle a significant concern, we show that it is possible to vet against all systematics (known and unknown) using single-epoch precursor observations with the Hubble Space Telescope roughly 10 years before the space mission.
Microlens Terrestrial Parallax Mass Measurements: A Rare Probe of Isolated Brown Dwarfs and Free-Floating Planets
Andrew Gould,Jennifer C. Yee
Physics , 2012, DOI: 10.1088/0004-637X/764/1/107
Abstract: Terrestrial microlens parallax is one of the very few methods that can measure the mass and number density of isolated dark low-mass objects, such as old free-floating planets and brown dwarfs. Terrestrial microlens parallax can be measured whenever a microlensing event differs substantially as observed from two or more well-separated sites. If the lens also transits the source during the event, then its mass can be measured. We derive an analytic expression for the expected rate of such events and then use this to derive two important conclusions. First the rate is directly proportional to the number density of a given population, greatly favoring low-mass populations relative to their contribution to the general microlensing rate, which further scales as sqrt{M} where M is the lens mass. Second, the rate rises sharply as one probes smaller source stars, despite the fact that the probability of transit falls directly with source size. We propose modifications to current observing strategies that could yield a factor 100 increase in sensitivity to these rare events.
Microlens Surveys are a Powerful Probe of Asteroids
Andrew Gould,Jennifer C. Yee
Physics , 2013, DOI: 10.1088/0004-637X/767/1/42
Abstract: While of order a million asteroids have been discovered, the number in rigorously controlled samples that have precise orbits and rotation periods, as well as well-measured colors, is relatively small. In particular, less than a dozen main-belt asteroids with estimated diameters D<3 km, have excellent rotation periods. We show how existing and soon-to-be-acquired microlensing data can yield a large asteroid sample with precise orbits and rotation periods, which will include roughly 6% of all asteroids with maximum brightness I<18.1 and lying within 10 deg of the ecliptic. This sample will be dominated by small and very small asteroids, down to D~1 km. We also show how asteroid astrometry could turn current narrow-angle OGLE proper motions of bulge stars into wide-angle proper motions. This would enable one to measure the proper-motion gradient across the Galactic bar.
The complete genome, comparative and functional analysis of Stenotrophomonas maltophilia reveals an organism heavily shielded by drug resistance determinants
Lisa C Crossman, Virginia C Gould, J Maxwell Dow, Georgios S Vernikos, Aki Okazaki, Mohammed Sebaihia, David Saunders, Claire Arrowsmith, Tim Carver, Nicholas Peters, Ellen Adlem, Arnaud Kerhornou, Angela Lord, Lee Murphy, Katharine Seeger, Robert Squares, Simon Rutter, Michael A Quail, Mari-Adele Rajandream, David Harris, Carol Churcher, Stephen D Bentley, Julian Parkhill, Nicholas R Thomson, Matthew B Avison
Genome Biology , 2008, DOI: 10.1186/gb-2008-9-4-r74
Abstract: The genome of the bacteremia-associated isolate S. maltophilia K279a is 4,851,126 bp and of high G+C content. The sequence reveals an organism with a remarkable capacity for drug and heavy metal resistance. In addition to a number of genes conferring resistance to antimicrobial drugs of different classes via alternative mechanisms, nine resistance-nodulation-division (RND)-type putative antimicrobial efflux systems are present. Functional genomic analysis confirms a role in drug resistance for several of the novel RND efflux pumps. S. maltophilia possesses potentially mobile regions of DNA and encodes a number of pili and fimbriae likely to be involved in adhesion and biofilm formation that may also contribute to increased antimicrobial drug resistance.The panoply of antimicrobial drug resistance genes and mobile genetic elements found suggests that the organism can act as a reservoir of antimicrobial drug resistance determinants in a clinical environment, which is an issue of considerable concern.The rise of antimicrobial drug resistance in bacteria is one of the biggest threats to healthcare provision in the developed world. Few new antimicrobial drugs are undergoing clinical trials, and almost none are effective against Gram-negative multi-drug resistant (MDR) pathogens [1]. A return to the pre-antibiotic era is a possibility, and for some infections is the current reality [2].Antimicrobial resistance in historically common pathogens is usually either acquired on a mobile genetic element or results from a mutation [3]. However, some opportunistic pathogens are intrinsically resistant to the actions of a number of antimicrobial classes. These tend to be of environmental origin, and their intrinsic drug resistance determinants either provide resistance to antibiotics produced by competitors, or represent broad-spectrum methods for removing toxic compounds or waste products that, by chance, protect against antimicrobials [3,4]. It is known that established opportuni
Hemolitic action of Naja naja atra cardiotoxin on erythrocytes from different animals
Troiano, J. C.;Gould, E. G.;Gould, I.;
Journal of Venomous Animals and Toxins including Tropical Diseases , 2006, DOI: 10.1590/S1678-91992006000100004
Abstract: a comparative study on the sensitivity of erythrocytes from different vertebrate species (avian, mammalian and reptilian) to the hemolytic action caused by cardiotoxin isolated from naja naja atra venom was carried out. cardiotoxin was able to induce direct hemolysis in washed erythrocytes from several animals, except for llama. the ec50 values from hemolysis of the most sensitive (cat) and the most resistant (snake) animal varied approximately tenfold. according to the cell behavior, it was possible to characterize four types of behavior: the first was observed in cat, horse and human cells; the second in rat, rabbit and dog erythrocytes; and the third only in llama erythrocytes, which were resistant to cardiotoxin concentrations up to 300 μg/ml. finally, avian and reptilian erythrocytes were more resistant to cardiotoxin iii-induced hemolysis than those of the mammalian species.
Editorial for Volume 18, 2012
Ballance, Virginia C.
International Journal of Bahamian Studies , 2012,
Abstract: Editorial
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