16,461 research outputs found

    Actions and Words: Luther and James through an Alternative Hermeneutical Lens

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    GEANT4 : a simulation toolkit

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    Abstract Geant4 is a toolkit for simulating the passage of particles through matter. It includes a complete range of functionality including tracking, geometry, physics models and hits. The physics processes offered cover a comprehensive range, including electromagnetic, hadronic and optical processes, a large set of long-lived particles, materials and elements, over a wide energy range starting, in some cases, from 250 eV and extending in others to the TeV energy range. It has been designed and constructed to expose the physics models utilised, to handle complex geometries, and to enable its easy adaptation for optimal use in different sets of applications. The toolkit is the result of a worldwide collaboration of physicists and software engineers. It has been created exploiting software engineering and object-oriented technology and implemented in the C++ programming language. It has been used in applications in particle physics, nuclear physics, accelerator design, space engineering and medical physics. PACS: 07.05.Tp; 13; 2

    The Courier, Number 36, 1970.

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    Barzillai Pease and Mr. Fulton\u27s Steamboat / Arsine Schmavonian -- University Library Problems and Trends / Robert Bingham Downs -- Poems from Once Upon a Dream / Martin Buxbaum -- Babington\u27s Bibliography of John Addington Symonds: Some Additions and Corrections / Timothy D\u27Arch Smith -- Stanley Edgar Hyman: An Appreciation / Robert Phillips -- Open for Research...Notes on Collections -- News of Library Associates -- Contributors to this Issu

    Spartan Daily, March 7, 2006

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    Volume 126, Issue 23https://scholarworks.sjsu.edu/spartandaily/10223/thumbnail.jp

    Spartan Daily, March 7, 2006

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    Volume 126, Issue 23https://scholarworks.sjsu.edu/spartandaily/10223/thumbnail.jp

    Spartan Daily, March 7, 2006

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    Volume 126, Issue 23https://scholarworks.sjsu.edu/spartandaily/10223/thumbnail.jp

    Spartan Daily, March 7, 2006

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    Volume 126, Issue 23https://scholarworks.sjsu.edu/spartandaily/10223/thumbnail.jp

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    Multishot versus Single-Shot Pulse Sequences in Very High Field fMRI: A Comparison Using Retinotopic Mapping

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    High-resolution functional MRI is a leading application for very high field (7 Tesla) human MR imaging. Though higher field strengths promise improvements in signal-to-noise ratios (SNR) and BOLD contrast relative to fMRI at 3 Tesla, these benefits may be partially offset by accompanying increases in geometric distortion and other off-resonance effects. Such effects may be especially pronounced with the single-shot EPI pulse sequences typically used for fMRI at standard field strengths. As an alternative, one might consider multishot pulse sequences, which may lead to somewhat lower temporal SNR than standard EPI, but which are also often substantially less susceptible to off-resonance effects. Here we consider retinotopic mapping of human visual cortex as a practical test case by which to compare examples of these sequence types for high-resolution fMRI at 7 Tesla. We performed polar angle retinotopic mapping at each of 3 isotropic resolutions (2.0, 1.7, and 1.1 mm) using both accelerated single-shot 2D EPI and accelerated multishot 3D gradient-echo pulse sequences. We found that single-shot EPI indeed led to greater temporal SNR and contrast-to-noise ratios (CNR) than the multishot sequences. However, additional distortion correction in postprocessing was required in order to fully realize these advantages, particularly at higher resolutions. The retinotopic maps produced by both sequence types were qualitatively comparable, and showed equivalent test/retest reliability. Thus, when surface-based analyses are planned, or in other circumstances where geometric distortion is of particular concern, multishot pulse sequences could provide a viable alternative to single-shot EPI

    The Cord Weekly (September 29, 1988)

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