1,047 research outputs found

    Fundamental Algorithms of the Goddard Battery Model

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    The Goddard Space Flight Center (GSFC) is currently producing a computer model to predict Nickel Cadmium (NiCd) performance in a Low Earth Orbit (LEO) cycling regime. The model proper is currently still in development, but the inherent, fundamental algorithms (or methodologies) of the model are defined. At present, the model is closely dependent on empirical data and the data base currently used is of questionable accuracy. Even so, very good correlations have been determined between model predictions and actual cycling data. A more accurate and encompassing data base has been generated to serve dual functions: show the limitations of the current data base, and be inbred in the model properly for more accurate predictions. The fundamental algorithms of the model, and the present data base and its limitations, are described and a brief preliminary analysis of the new data base and its verification of the model's methodology are presented

    Temporal coherence length of light in semiclassical field theory models

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    The following work is motivated by the conceptual problems associated with the wave-particle duality and the notion of the photon. Two simple classical models for radiation from individual emitters are compared, one based on sines with random phasejumps, another based on pulse trains. The sum signal is calculated for a varying number of emitters. The focus lies on the final signal's statistical features quantified by means of the temporal coherence function and the temporal coherence length. We show how these features might be used to experimentally differentiate between the models. We also point to ambiguities in the definition of the temporal coherence length.Comment: 7 pages, 3 figures. The following article has been submitted to AIP Conference Proceedings: Advances in Quantum Theory, Vaxjo 201

    A Note On Interpreting Canary Exposure

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    Canary exposure, introduced in Carlini et al. is frequently used to empirically evaluate, or audit, the privacy of machine learning model training. The goal of this note is to provide some intuition on how to interpret canary exposure, including by relating it to membership inference attacks and differential privacy.Comment: short note, edited to add a sentence on independence of canary losses, including adding Pillutla et a

    "Let everybody love me" : the transnational body of Elżbieta Czyżewska

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    The ways to create a star personality in the Polish People's Republic are closer to the strategy of creating stars in the Soviet cinema, where the star had to function as an power engine, as an incentive to action, than to the Hollywood system (star system). It is well illustrated by the career of Elżbieta Czyżewska: not only was she the most fascinating actress of her generation but she was also quickly transformed into a star. Czyżewska’s body used as a screen on which first the (socialist) desires and then (socialist) fears were projected, was placed - almost from the beginning of her career - in transnational contexts. She crossed borders not only on the screen: in 1965 Czyżewska married The New York Times correspondent, David Halberstam, and left for New York, or rather was forced to leave. The star’s previously ideal body suddenly appeared to be - not for "strangers" but for "us", not outside the national community but inside it - a transgressive (since openly transnational) anti-body. This article explores (1) the phenomenon of a star in the Polish People's Republic ("socialist star system"), (2) transgressions of Czyżewska in the West, (3) and, above all, their Polish reception

    The Mathematics Curriculum Improvement Project

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