6,458 research outputs found

    A Theory of Presentism

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    Also appears in: (1) L.N.Oaklander and E.Magalhaes (eds.) Presentism: A Reader (Rowman & Littlefield, 2010) (2) L.N. Oaklander (ed.) Routledge Major Works: The Philosophy of Time: Critical Concepts in Philosophy (London: Routledge, 2008)Most of us would want to say that it is true that Socrates taught Plato. According to realists about past facts, this is made true by the fact that there is, located in the past, i.e., earlier than now, at least one real event that is the teaching of Plato by Socrates. Presentists, however, in denying that past events and facts exist cannot appeal to such facts to make their past-tensed statements true. So what is a presentist to do? There are at least three conditions that would ideally be met in a satisfactory solution to this problem: (1) It must preserve our views about which statements are true and which false; (2) It must be transparent what the truthmakers are for those statements; (3) It must accommodate the truth-value links between various times. I shall survey two different families of proposals for the presentist's truthmakers and show that they fail at least one of these three conditions. This is not entirely negative, for it shows us what an adequate solution to the problem would look like. I go on to show where presentists can find suitable objects that satisfy these conditions, and in this way give a clear statement of presentism, something that is lacking in the literature.Peer reviewe

    A transient solution for domain wall motion

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    An analytic solution of transient wall motion in a bulk ferromagnetic material is obtained from the dynamic torque equations with a Gilbert damping term. The steady state solution reduces to previously obtained, well known solutions

    Eddy-current-free switching of permalloy thin films

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    Eddy current free switching of permalloy thin magnetic film, and large-angle flux reversal measurement

    Transient and steady-state velocity of domain walls for a complete range of drive fields

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    Approximate analytic solutions for transient and steady-state 180 deg domain wall motion in bulk magnetic material are obtained from the dynamic torque equations with a Gilbert damping term. The results for the Walker region in which the transient solution approaches the familiar Walker steady-state solution are presented in a slightly new form for completeness. An analytic solution corresponding to larger drive fields predicts an oscillatory motion with an average value which decreases with drive field for reasonable values of the damping parameter. These results agree with those obtained by a computer solution of the torque equation and those obtained with the assumption of a very large anisotropy field

    Run-Time Selection of Coordination Mechanisms in Multi-Agent Systems

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    This paper presents a framework that enables autonomous agents to dynamically select the mechanism they employ in order to coordinate their inter-related activities. Adopting this framework means coordination mechanisms move from the realm of being imposed upon the system at design time, to something that the agents select at run-time in order to fit their prevailing circumstances and their current coordination needs. Empirical analysis is used to evaluate the effect of various design alternatives for the agent's decision making mechanisms and for the coordination mechanisms themselves

    Wall contraction in Bloch wall films

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    The phenomenon of wall contraction characterized by a peak in the velocity field relationship and a region of negative differential mobility is observed. Uniaxial magnetic thin films of various compositions and magnetic properties are studied in careful interrupted pulse experiments. The observed results agree quite well with the theory for bulk samples

    Generating Effective Instructions: Knowing When to Stop

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    One aspect of Natural Language generation is describing entities so that they are distinguished from all other entities. Entities include objects, events, actions, and states. Much attention has been paid to objects and the generation of their referring expressions (descriptions meant to pick out or refer to an entity). However, a growing area of research is the automated generation of instruction manuals and an important part of generating instructions is distinguishing the actions that are to be carried out from other possible actions. One distinguishing feature is an action\u27s termination, or when the performance of the action is to stop. My dissertation work focuses on generating action descriptions from action information using the SPUD generation algorithm developed here at Penn by Matthew Stone. In my work, I concentrate on the generation of expressions of termination information as part of action descriptions. The problems I address include how termination information is represented in action information and expressed in Natural Language, how to determine when an action description allows the reader to understand how to perform the action correctly, and how to generate the appropriate description of action information
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