30,878 research outputs found

    Lost City meteorite: Its recovery and a comparison with other fireballs

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    Lost City meteoroid trajectory analysis and determination of original mas

    Lost City meteorite - It's recovery and a comparison with other fireballs

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    Photographic and trajectory data for Lost City meteor and establishment of calibration of mass scale of other meteor

    Lexicographic choice functions without archimedeanicity

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    We investigate the connection between choice functions and lexicographic probabilities, by means of the convexity axiom considered by Seidenfeld, Schervisch and Kadane (2010) but without imposing any Archimedean condition. We show that lexicographic probabilities are related to a particular type of sets of desirable gambles, and investigate the properties of the coherent choice function this induces via maximality. Finally, we show that the convexity axiom is necessary but not sufficient for a coherent choice function to be the infimum of a class of lexicographic ones

    INTERPERSONAL HEART-BRAIN REGISTRATION AND THE PERCEPTION OF PARENTAL LOVE: A 42 YEAR FOLLOW-UP OF THE HARVARD MASTERY OF STRESS STUDY

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    A dynamical energy systems approach to cardiac energy predicts that the registration of cardiac energy can occur between individuals, and that the degree of registration may be greater in persons who are more open to interpersonal information. As part of a 42 year follow-up to the Harvard Mastery of Stress study, 19 channels of EEG and the ECG were recorded during a 2 minute eyes closed resting baseline from 20 Harvard graduates currently in their 60's and from an experimenter who sat 3 feet in front of the subjects. Cardiac synchronized energy patterns were calculated in the subjects' EEGs separately triggered by the subjects' ECG and the experimenter's ECG. When the subjects' own ECG was used as the trigger, significant evidence of the subjects' ECG in the subjects' EEG was found, primarily in the posterior regions. When the experimenter's ECG was used as the trigger, significant evidence of the experimenter's ECG in the subjects' EEG was found, primarily in anterior regions, in subjects who rated themselves in college as having been raised by loving parents. These subjects were also significantly healthier in late adulthood than subjects who rated their parents "low in loving." Implications for theory and research in energy medicine are considered

    A volumetric Penrose inequality for conformally flat manifolds

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    We consider asymptotically flat Riemannian manifolds with nonnegative scalar curvature that are conformal to RnΩ,n3\R^{n}\setminus \Omega, n\ge 3, and so that their boundary is a minimal hypersurface. (Here, ΩRn\Omega\subset \R^{n} is open bounded with smooth mean-convex boundary.) We prove that the ADM mass of any such manifold is bounded below by (V/βn)(n2)/n(V/\beta_{n})^{(n-2)/n}, where VV is the Euclidean volume of Ω\Omega and βn\beta_{n} is the volume of the Euclidean unit nn-ball. This gives a partial proof to a conjecture of Bray and Iga \cite{brayiga}. Surprisingly, we do not require the boundary to be outermost.Comment: 7 page

    About Superluminal motions and Special Relativity: A Discussion of some recent Experiments, and the solution of the Causal Paradoxes

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    Some experiments, performed at Berkeley, Cologne, Florence, Vienna, Orsay, Rennes, etc., led to the claim that something seems to travel with a group velocity larger than the speed c of light in vacuum. Various other experimental results seem to point in the same direction: For instance, localized wavelet- type solutions to Maxwell equations have been found, both theoretically and experimentally, that travel with superluminal speed. [Even muonic and electronic neutrinos [it has been proposed] might be "tachyons", since their square mass appears to be negative]. With regard to the first-mentioned experiments, it was recently claimed by Guenter Nimtz that those results with evanescent waves (or tunneling photons) imply superluminal signal and impulse transmission, and therefore violate Einstein causality. In this note we want to stress that, on the contrary, all such results do not place relativistic causality in jeopardy, even if they referred to actual tachyonic motions: In fact, Special Relativity can cope even with superluminal objects and waves. For instance, it is possible (at least in microphysics) to solve also the known causal paradoxes, devised for faster than light motion, although this is not widely recognized yet. Here we show, in detail and rigorously, how to solve the oldest causal paradox, originally proposed by Tolman, which is the kernel of many further tachyon paradoxes (like J.Bell's, F.A.E.Pirani's, J.D.Edmonds' and others'). The key to the solution is a careful application of tachyon mechanics, as it unambiguously follows from special relativity. At Last, in one of the two Appendices, we propose how to evaluate the group-velocity in the case of evanescent waves. [PACS nos.: 03.30.+p; 03.50.De; 41.20.Jb; 73.40.Gk; 84.40.Az; 42.82.Et ]Comment: LaTeX file: 26 pages, with 5 Figures (and two Appendices). The original version of this paper appeared in the Journal below
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