1,721,720 research outputs found
Sing-Around Ultrasonic Velocimeter
No full textThe Sing-Around Ultrasonic Velocimeter was developed by Martin Greenspan and Carroll E. Tschiegg at the National Bureau of Standards in 1956. The velocimeter precisely measures and records the speed of sound in liquids. The special sing-around circuit measures the speed of sound in liquids by calculating the time that it takes for an electrical signal to travel back and forth between two transducers. The speed at which these electronic signals travels is then compared to the known speed of sound in air, ultimately determining the speed of sound through the liquid of interest. Outwardly similar to the ultrasonic delay line employed in digital computers of the era for information storage, the sing-around velocimeter consists of a tank containing two electroacoustic transducers, a sender and a receiver, and the liquid under test. A pulse generator applies a voltage pulse to the sender, producing a sound pulse that travels through the liquid to the receiver. The pulse, amplified and shaped, is then used to synchronize the pulse generator. In effect, the same pulse goes round and round the circuit, and the number of times it goes around per second (the pulse repetition frequency) depends on the velocity of sound in the liquid. There is also a small, constant delay in the electrical circuits, which is measured when the instrument is calibrated with a liquid in which the speed of sound is accurately known.72 x 19 x 19 cm; weight: 30 lbs
Carroll E. Lockhart
No full textSeries 328 | Board of Pardons | Prisoners' pardon application case files | Carroll E. LockhartCase files consist of letters to the Governor, a formal application for a pardon, petitions and letters of support from the public and officials connected to the case. Cases illustrate the process of review by the board of cases of prisoners incarcerated in the Utah prison system to determine if they should be released before their regular sentence ended
Lost in semantic space: a multi-modal, non-verbal assessment of feature knowledge in semantic dementia
No full textA novel, non-verbal test of semantic feature knowledge is introduced, enabling subordinate knowledge of four important concept attributes—colour, sound, environmental context and motion—to be individually probed. This methodology provides more specific information than existing non-verbal semantic tests about the status of attribute knowledge relating to individual concept representations. Performance on this test of a group of 12 patients with semantic dementia (10 male, mean age: 64.4 years) correlated strongly with their scores on more conventional tests of semantic memory, such as naming and word-to-picture matching. The test's overlapping structure, in which individual concepts were probed in two, three or all four modalities, provided evidence of performance consistency on individual items between feature conditions. Group and individual analyses revealed little evidence for differential performance across the four feature conditions, though sound and colour correlated most strongly, and motion least strongly, with other semantic tasks, and patients were less accurate on the motion features of living than non-living concepts (with no such conceptual domain differences in the other conditions). The results are discussed in the context of their implications for the place of semantic dementia within the classification of progressive aphasic syndromes, and for contemporary models of semantic representation and organization
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Evolving mature product platforms in discontinuous markets : an analysis of IBM's mainframe software business
No full textThesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.Includes bibliographical references (leaves 91-92).by Carroll E. Fulkerson, Jr.M.S
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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