130,103 research outputs found

    Spitzer as a microlens parallax satellite : mass and distance measurements of the binary lens system OGLE-2014-BLG-1050L

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    We report the first mass and distance measurements of a caustic-crossing binary system OGLE-2014-BLG-1050 L using the space-based microlens parallax method. Spitzer captured the second caustic crossing of the event, which occurred ~10 days before that seen from Earth. Due to the coincidence that the source-lens relative motion was almost parallel to the direction of the binary-lens axis, the fourfold degeneracy, which was known before only to occur in single-lens events, persists in this case, leading to either a lower-mass (0.2 and 0.07 MΘ) binary at ~1.1 kpc or a higher-mass (0.9 and 0.35 MΘ) binary at ~3.5 kpc. However, the latter solution is strongly preferred for reasons including blending and lensing probability. OGLE-2014-BLG-1050 L demonstrates the power of microlens parallax in probing stellar and substellar binaries.Peer reviewe

    Accn 998, Interviews with Jews in Utah, Joanne Spitzer McGillis

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    Transcript (34 pages) of interview by Lorraine Ferra with Joanne Spitzer McGillis on May 13, 1982 for the Interviews with Jews in Utah Oral History Project.In this interview, conducted by Lorraine Ferra, McGillis (b. 1932) recalls her childhood in Sandy, Utah, her socialist grandfather, and local scandal involving Rabbi Gordon. She also talks about the differences between congregations Montefiore and B\u27nai Israel, her family\u27s response to Hitler and World War II, anti-Semitism in her grade school, discrimination in the community, and her sense of Jewish identity. 34 pages

    Ferromagnetic Heisenberg XXZ chain in a pinning field

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    We investigate the effect of a magnetic field supported at a single lattice site on the low-energy spectrum of the ferromagnetic Heisenberg XXZ chain. Such fields, caused by impurities, can modify the low-energy spectrum significantly by pinning certain excitations, such as kink and droplet states. We distinguish between different boundary conditions (or sectors), the direction and also the strength of the magnetic field. E.g., with a magnetic field in the z direction applied at the origin and ++ boundary conditions, there is a critical field strength Bc (which depends on the anisotropy of the Hamiltonian and the spin value) with the following properties: for BBc there is again a unique ground state but now belonging to the continuous spectrum. In contrast, any magnetic field with a nonvanishing component in the xy plane yields a unique ground state, which, depending on the boundary conditions, is either an (anti)kink, or an (anti)droplet state. For such fields, i.e., not aligned with the z axis, excitations always have a gap and we obtain a rigorous lower bound for that gap

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed

    Dispelling the Myths Behind First-author Citation Counts

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    We conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more sophisticated methods

    The Spitzer Bibliography Database: bibliographic statistics

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    The Spitzer Science Center maintains a database of peer-refereed publications utilizing observations made by the Spitzer Space Telescope5. Originally intended as a way to easily track these publications with limited resources, the database has grown in scope to provide more services for investigators. The design and population of the system and some interesting insights into the use of Spitzer data are presented

    Alan B. Spitzer, The French Generation of 1820

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    Charle Christophe. Alan B. Spitzer, The French Generation of 1820. In: Annales. Economies, sociétés, civilisations. 44ᵉ année, N. 4, 1989. pp. 906-908

    Alan B. Spitzer, The French Generation of 1820

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    Charle Christophe. Alan B. Spitzer, The French Generation of 1820. In: Annales. Economies, sociétés, civilisations. 44ᵉ année, N. 4, 1989. pp. 906-908

    Spitzer Heritage Archive

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    The Spitzer Heritage Archive will host all the raw and final reprocessed science and calibration data products from the observations made by Spitzer Space Telescope. The interactive web interface will give users the tools to search the database and explore their search results interactively. We also reuse the existing software and services and pay close attention to the re-usability of the newly developed system, making it easy to expand and adopt new technology in the future. This paper discusses our design principles, system architecture, reuse of the existing software, and reusable components of the system
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