18,610 research outputs found
Ray Foster
Get PDFInterviewers: Cole Hollins, Jacob Tibbidough, Baily (Last Name?)
Interviewee: Ray Foster
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The scientific memoirs of Thomas Henry Huxley. Edited by Michael Foster and E. Ray Lankester
No full textTHE SCIENTIFIC MEMOIRS OF THOMAS HENRY HUXLEY. EDITED BY MICHAEL FOSTER AND E. RAY LANKESTER
The scientific memoirs of Thomas Henry Huxley. Edited by Michael Foster and E. Ray Lankester (-
[Letter from Alex Bradford to Lieutenant and Mrs. Ray Starner - November 4, 1940]
No full textLetter from Alex Bradford to Lieutenant and Mrs. Ray Starner describing the the current state of affairs that the author was experiencing, including: the London blitz, the moral of the troops on the ground, and the collective company of men opposing the Nazi regime
Mike Buchanan
No full textPhotograph used for a story in the Daily Oklahoman newspaper. Caption: "Mike Buchanan writes the last story as Ray Foster photographs him.
[Photograph 2012.201.B0239.0438]
No full textPhotograph taken for a story in the Oklahoma Times newspaper. Caption: "Melville Cooper, above, is caught by staff photographer Ray Foster as he puts on his makeup.
The Many Moods
No full textPhotograph used for a story in the Oklahoma Times newspaper. Caption: "The many moods of controversial artist, museum director, teacher Frederick Black are reflected in these pictures taken by Times Staff photographer Ray Foster.
Silicon photomultipliers in radiation sensing applications
No full textThe Silicon Photomultiplier (SIPM) is a novel photon sensing device, with potential applications in particle physics, astronomy and general gamma-ray spectroscopy.Various SiPM designs were evaluated for these roles by coupling them to a range of scintillators, including LSO, NaI(Tl) and CsI(Tl). It was found that a LSO-SiPM gamma-ray detector provide sufficiently good energy resolution (11% at 511keV) in a very compact package to be of interest in PET imaging. SiPMs awere also found to provide competitive spectra to PIN diodes of comparable area (1cm2) when coupled to CsI(Tl), raising interest in gamma-ray astronomy where a CsI(Tl)-SiPM detector could be used as an imaging element.Good performance with CsI(Tl) encouraged investigation of SiPMs in the gamma-ray spectroscopy role, specifically radioisotope identification with portable instruments. The ScintiSphere concept was exploited to allow a larger, more sensitive detector to be built using SiPMs without sacrificing spectral quality. An 8cc sphere of CsI(Tl) coupled to a 1cm2 SiPM array was found to give a noise floor of 35keV and a resolution of 9% at 662keV, closely comparable to a 0.8cc square crystal, despite the factor of 10 improvement in sensitive volume. Neutron detection with a SiPM array is achieved using LiI(Eu), which was found to resolve thermal neutron captures to 12% FWHM and achieve excellent gamma-ray rejection. In this application, SiPMs are preferable to PIN diodes as they are immune to direct gamma-ray interactions which could degrade gamma-ray rejection. When packaged in a compact moderator of 15mm depth and volume 58cc of HDPE, a compact neutron counter was built and found to be slightly more efficient than a 3” He3 tube packaged in 16mm of HDPE. Finally, an instrument is proposed that exploits the intrinsic advantages of SiPMs. The use of SiPMs with LaBr(Ce) is explored and simulations are carried out of a directional spectrometer, predicted to locate a Cs137 source of 1mC at 2m to within 15° in 15 seconds. In conclusion, it is found that SiPMs should be of great interest in these fields due to providing comparable performance to existing systems whilst providing additional benefits such as low power electronics, high gain and immunity to direct X-ray interactions
The student's guide to completing an author study
No full textThe 'Student's guide to completing an author study' emerged during the early development of the school library resource center program at Glen Stewart Elementary School in Stratford Canada on Prince Edward Island. This research process centered on an author study, with direct teaching and clear assignment. The resulting model has been adapted to various grade levels and subject areas in different schools.Source type: Electronic(1)http://proquest.umi.com/pqdweb?did=49237063&Fmt=7&clientId=65345&RQT=309&VName=PQ
Active X-ray optics for the next generation of X-ray space telescopes
No full textDescribed within is the design, manufacture, metrology and X-ray testing of an active X-ray
prototype intended for the next generation of X-ray telescopes. One of the challenges faced by
the X-ray telescope community is how to combine high resolution and high sensitivity into one
system, as weight limitations place constraints on the optics that can be launched. Therefore the
mandate of the active X-ray prototype is to provide high sensitivity through the ability of the optics
to be nested and to deliver high angular resolution through the active control of the optic’s form.
Piezoelectric unimorph actuators provide the active component: it is intended that they will correct
for figure errors within the optic and therefore increase the angular resolution capability.
The prototype’s design is based upon an ellipsoidal segment which provides point-to-point
focussing of an X-ray source. The prototype itself is composed of an electroformed nickel optic
where the non-reflective surface is populated with 30 piezoelectric actuators and it is the production
of the prototype that is the core of the presented research. Metrology of the actuators’ influence
functions is presented and highlight the prototype’s ability to deform its optic surface by microns.
In addition, the measured influence functions are compared against finite element models and a
distinct similarity between the functions is observed.
The prototype was tested at an X-ray beamline facility in November 2008 and the results
showed the prototype’s ability to correct the optic to achieve an improved angular resolution: from
0.786 arc-minutes to 0.686 arc-minutes in terms of full width half maximum. Finally, difficulties
in the manufacture of the prototype and X-ray testing shall be presented alongside future work in
conclusion to this thesis
Author, Geraldine Brooks at the National Library of Australia for the 2009 Ray Mathew Lecture, Canberra, 23 October 2009 [picture] /
No full textTitle from acquisitions documentation.; Part of the collection: Portraits of author, Geraldine Brooks during her visit to the National Library of Australia for the 2009 Ray Mathew Lecture, Canberra, 23 October 2009.; Acquired in digital format; access copy available online.; Mode of access: Internet via World Wide Web.; Photographed by a staff member of the National Library of Australia
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