2,156 research outputs found
Series 1: Papers : AIDs Newspaper Clippings and Correspondence, 1985-1989
No full textLetter from J. Chris Jacobsen with the Food Group discussing efforts to provide food for people paying for AIDS treatment
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Series 1: Papers : AIDs Newspaper Clippings and Correspondence, 1985-1989
No full textLetter from J. Chris Jacobsen with the Food Group discussing efforts to provide food for people paying for AIDS treatment
X-ray Diffraction Microscopy: Computational Methods and Scanning-type Experiments
No full textX-ray Diffraction Microscopy (XDM) has been gaining in popularity for nanoscale imaging of biological and material science samples. Its high penetration depth (compared to electron microscopy) and its good dose efficiency (compared to its lens-based X-ray alternative) make it uniquely suited for imaging whole biological specimens, where radiation damage is a concern. Despite these advantages, XDM is still far from being a routine imaging tool. This is due to the computational challenge of reconstructing an image from recorded diffraction intensities as well as difficult-to-satisfy experimental requirements. I address these challenges by improving on the computational methods and by implementing a more reliable experimental geometry for our existing diffraction microscope at the Advanced Light Source, Lawrence Berkeley Lab. First, a software library has been developed that streamlines the post-experiment processing of data and that improves on an important aspect of data analysis. Results will be shown that illustrate the collective improvement to the reconstruction process. A modified version of a tool commonly used to assess the consistency of reconstructions is proposed and criteria of its validity are derived. Results show that it has improved utility for judging reconstruction quality. Second, a scanning-type experimental setup has been implemented for our existing diffraction microscope. Several possible geometries are discussed and preliminary results from recent experimental data are shown.Advisor(s): Chris J. Jacobsen. Committee Member(s): Alexandre G. Abanov; Anand Sivaramakrishnan; Hanfei Yan.Stony Brook University Libraries. SBU Graduate School in Department of Physics. Lawrence Martin (Dean of Graduate School)
Writers Talk featuring Chris Sunami
No full textChris Sunami describes writers and performers who will be at the Columbus Invitational Artists Competition. OSU student TJ Armstrong reviews two new Batman books: Batmobile: The Complete History and The Dark Knight Manual. And Ohio paranormal author John B. Kachuba describes what's scary about the Buckeye State.The media can be accessed here: http://streaming.osu.edu/knowledgebank/WritersTalk-Audio/WT_2012-8-6_sunami-kuchaba-batman.mp3Ohio State University. Center for the Study and Teaching of Writin
Hard X-ray Phase Contrast Microscopy. Techniques and Applications.
No full textIn 1918, Einstein provided the first description of the nature of the refractive index for X-rays, showing that phase contrast effects are significant. A century later, most x-ray microscopy and nearly all medical imaging remains based on absorption contrast, even though phase contrast offers orders of magnitude improvements in contrast and reduced radiation exposure at multi-keV x-ray energies.The work presented is concerned with developing practical and quantitative methods of phase contrast for x-ray microscopy. A theoretical framework for imaging in phase contrast is put forward; this is used to obtain quantitative images in a scanning microscope using a segmented detector, and to correct for artifacts in a commercial phase contrast x-ray nano-tomography system. The principle of reciprocity between scanning and full-field microscopes is then used to arrive at a novel solution: Zernike contrast in a scanning microscope. These approaches are compared on a theoretical and experimental basis in direct connection with applications using multi-keV x-ray microscopes at the Advanced Photon Source at Argonne National Laboratory.Phase contrast provides the best means to image mass and ultrastructure of light elements that mainly constitute biological matter, while stimulated x-ray fluorescence provides high sensitivity for studies of the distribution of heavier trace elements, such as metals. These approaches are combined in a complementary way to yield quantitative maps of elemental concentration from 2D images, with elements placed in their ultrastructural context. The combination of x-ray fluorescence and phase contrast poses an ideal match for routine, high resolution tomographic imaging of biological samples in the future. The presented techniques and demonstration experiments will help pave the way for this development.Advisor(s): Chris Jacobsen. Committee Member(s): Harold Metcalf; Martin Rocek; J rgen Thieme.Stony Brook University Libraries. SBU Graduate School in Department of Physics. Lawrence Martin (Dean of Graduate School)
Millennial-scale variability in south-east Australian hydroclimate between 30,000 and 10,000 years ago
No full textAvailable online 1 June 2018Abstract not availableGeorgina Falster, Jonathan Tyler, Katharine Grant, John Tibby, Chris Turney, Stefan Löhr, Geraldine Jacobsen, A. Peter Kersha
'We always come here': investigating the social in social learning
No full textThis paper investigates student choices around the 'Third Space' for learning; that which is not either a teaching space or a private space. In mapping the use of such spaces around the University of Northampton's campuses and through the use of semi-structured interviews with students as they use the spaces it constructs a model to help understand why students choose a particular space to work in and influence decisions in the deliberate creation of such spaces in future.
The research shows four, often overlapping, influences on student choice of space; resources, environment, social and emotional. That resource rich spaces that allow social interaction and learning to take place in attractive environments are popular should not be surprising but it is the emotional response to space that is of particular interest. Space attachment theory has usually centred on home or places with religious or national symbolism. This paper identifies an element of emotional resonance to areas of the university campus, especially the library, that will warrant further research
Player agency in interactive narrative: audience, actor & author
No full textThe question motivating this review paper is, how can
computer-based interactive narrative be used as a constructivist learn-
ing activity? The paper proposes that player agency can be used to
link interactive narrative to learner agency in constructivist theory,
and to classify approaches to interactive narrative. The traditional
question driving research in interactive narrative is, ‘how can an in-
teractive narrative deal with a high degree of player agency, while
maintaining a coherent and well-formed narrative?’ This question
derives from an Aristotelian approach to interactive narrative that,
as the question shows, is inherently antagonistic to player agency.
Within this approach, player agency must be restricted and manip-
ulated to maintain the narrative. Two alternative approaches based
on Brecht’s Epic Theatre and Boal’s Theatre of the Oppressed are
reviewed. If a Boalian approach to interactive narrative is taken the
conflict between narrative and player agency dissolves. The question
that emerges from this approach is quite different from the traditional
question above, and presents a more useful approach to applying in-
teractive narrative as a constructivist learning activity
Interview with Chris Koch by Helen Tiffin, 25 Sep 1983
No full textHelen Tiffin interviews Tasmanian author Chris Koch about his work
Cerococcus corymbosus Fletcher
No full textCerococcus corymbosus Fletcher, nomen nudum. Cerococcus corymbosus Ftcher, 1917: 252. Note: Fletcher refers to Cerococcus corymbosus but gives no description and does not cite an author for this species (Miller et al. 2005).Published as part of Chris J. Hodgson & Douglas J. Williams, 2016, (Hemiptera: Sternorrhyncha, Coccomorpha) with particular reference to species from the Afrotropical, western Palaearctic and western Oriental Regions, with the revival of Antecerococcus Green and description of a new genus and fifteen new species, and with ten new synonomies, pp. 1-175 in Zootaxa 4091 (1) on page 158, DOI: 10.11646/zootaxa.4091.1.1, http://zenodo.org/record/26533
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