44,660 research outputs found

    Word and Image in Ancient Egypt

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    Detectors and cryostat design for the SuMIRe Prime Focus Spectrograph (PFS)

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    We describe the conceptual design of the camera cryostats, detectors, and detector readout electronics for the SuMIRe Prime Focus Spectrograph (PFS) being developed for the Subaru telescope. The SuMIRe PFS will consist of four identical spectrographs, each receiving 600 fibers from a 2400 fiber robotic positioner at the prime focus. Each spectrograph will have three channels covering wavelength ranges 3800 {\AA} - 6700 {\AA}, 6500 {\AA} - 10000 {\AA}, and 9700 {\AA} - 13000 {\AA}, with the dispersed light being imaged in each channel by a f/1.10 vacuum Schmidt camera. In the blue and red channels a pair of Hamamatsu 2K x 4K edge-buttable CCDs with 15 um pixels are used to form a 4K x 4K array. For the IR channel, the new Teledyne 4K x 4K, 15 um pixel, mercury-cadmium-telluride sensor with substrate removed for short-wavelength response and a 1.7 um cutoff will be used. Identical detector geometry and a nearly identical optical design allow for a common cryostat design with the only notable difference being the need for a cold radiation shield in the IR camera to mitigate thermal background. This paper describes the details of the cryostat design and cooling scheme, relevant thermal considerations and analysis, and discusses the detectors and detector readout electronics

    In search of space: Fourier spectroscopy, 1950-1970

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    In the large grey area between science and technology, specialisms emerge with associated specialists. But some specialisms remain ‘peripheral sciences’, never attaining the status of ‘disciplines’ ensconced in universities, and their specialists do not become recognised professionals. A major social component of such side-lined sciences – one important grouping of technoscientific workers – is the ‘research-technology community’. An important question concerning research-technology is to explain how the grouping survives without specialised disciplinary and professional affiliations. The case discussed illustrates the dynamics of one such community

    In search of space: Fourier spectroscopy, 1950-1970

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    In the large grey area between science and technology, specialisms emerge with associated specialists. But some specialisms remain ‘peripheral sciences’, never attaining the status of disciplines ensconced in universities, and their specialists do not become recognised professionals. A major social component of such side-lined sciences – one important grouping of techno-scientific workers – is the research-technology community. An important question concerning research-technology is to explain how the grouping survives without specialised disciplinary and professional affiliations. The case discussed illustrates the dynamics of one such community

    The Promise of Diversity in the Library Community

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    Waterloo College Cord (November 1, 1950)

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    Structuring information through gesture and intonation

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    Face-to-face communication is multimodal. In unscripted spoken discourse we can observe the interaction of several “semiotic layers”, modalities of information such as syntax, discourse structure, gesture, and intonation. We explore the role of gesture and intonation in structuring and aligning information in spoken discourse through a study of the co-occurrence of pitch accents and gestural apices. Metaphorical spatialization through gesture also plays a role in conveying the contextual relationships between the speaker, the government and other external forces in a naturally-occurring political speech setting

    Piece by Piece Review of Digitize-and-Lend Projects Through the Lens of Copyright and Fair Use

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    Digitize-and-lend library projects can benefit societies in multiple ways, from providing information to people in remote areas, to reducing duplication of effort in digitization, to providing access to people with disabilities. Such projects contemplate not just digitizing library titles for regular patron use, but also allowing the digitized versions to be used for interlibrary loan (ILL), sharing within consortia, and replacing print copies at other libraries. Many of these functions are already supported within the analog world (e.g., ILL), and the digitize-and-lend concept is largely a logical outgrowth of technology, much like the transitioning from manual hand duplication of books to printing presses. The purpose of each function is to facilitate user access to information. Technology can amplify that access, but in doing so, libraries must also be careful not to upset the long established balance in copyright, where authors’ rights sit on the other side of the scale from public benefit. This article seeks to provide a primer on the various components in a digitize-and-lend project, explore the core copyright issues in each, and explain how these projects maintain the balance of copyright even as libraries take advantage of newer technologies
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