276,082 research outputs found

    Comment on "On the Crooks fluctuation theorem and the Jarzynski equality" [J. Chem. Phys. 129, 091101 (2008)]

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    It has recently been argued that a self-consistency condition involving the Jarzynski equality (JE) and the Crooks fluctuation theorem (CFT) is violated for a simple Brownian process [L. Y. Chen, J. Chem. Phys. 129, 091101 (2008)]. This note adopts the definitions in the original formulation of the JE and CFT and demonstrates the contrary.Comment: 2 page

    Foreign Direct Investment in the United States: Interest Rate and Exchange Rate

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    David Y. Chen, Ph.D., is an associate professor, Department of Economics and Transportation/ Logistics. North Carolina A&T State University, Greensboro, NC 27411

    Efficient Authenticated Encryption Schemes with Public Verifiability

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    An authenticated encryption scheme allows messages to be encrypted and authenticated simultaneously. In 2003, Ma and Chen proposed such a scheme with public verifiability. That is, in their scheme the receiver can efficiently prove to a third party that a message is indeed originated from a specific sender. In this paper, we first identify two security weaknesses in the Ma-Chen authenticated encryption scheme. Then, based on the Schnorr signature, we proposed an efficient and secure improved scheme such that all the desired security requirements are satisfied.Comment: Early version appears in the Proc. of The 60th IEEE Vehicular Technology Conference (VTC 2004-Fall) - Wireless Technologies for Global Security. IEEE, 200

    TRANSLATING THE VISUAL: CHEN CHIEH-JEN’S WORK

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    Nacido en Taiwán y actualmente residente en Taipei, Chen Chieh-jen (1960) es un videoartista cuya obra presenta una profunda y feroz – aunque a menudo silenciosa – meditación histórica y política. Sus obras se caracterizan por la inserción de imágenes de archivo que se relacionan y dialogan con imágenes contemporáneas. Mirando el pasado de China en relación con su presente, Chen subraya las consecuencias sociales, las expectativas frustradas, las interpretaciones erróneas y las apropiaciones de la mirada occidental. En particular, este estudio aborda un vídeo realizado en 2002, “Lingchi - Echoes of a historical photograph” y otro, “Factory”, realizado en 2003 que revelan el foco principal y la praxis visual y auditiva del artista. En la obra de Chen, de hecho, la visión y, sobre todo, sus límites, tanto en el sentido concreto como en el metafórico, juegan un papel importante en la construcción de un denso discurso artístico y conceptual relacionado con la creación de imágenes y la traducción visual.Born in Taiwan and currently living in Taipei, Chen Chieh-jen (1960) is a video-artist whose oeuvre presents a profound and fierce – although often silent – historical and political meditation. His works are characterized by the insertion of archival footage in close dialogue with actual and contemporary images. Looking at China’s past in relation to its present, Chen underlines social damages, frustrated expectations, misinterpretations and appropriations by the Western gaze. In particular, this study addresses a video made in 2002, “Lingchi - Echoes of a historical photograph”, and “Factory” realized in 2003; having as a mainfocus the artist’s visual and aural praxis. In Chen’s work in fact, vision, and most of all its limits, in both a concrete and metaphorical sense, play a major part in the construction of a dense artistic and conceptual discourse related to image-making and visual translation.

    Test of Universality in Anisotropic 3D Ising Model

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    Chen and Dohm predicted theoretically in 2004 that the widely believed universality principle is violated in the Ising model on the simple cubic lattice with more than only six nearest neighbours. Schulte and Drope by Monte Carlo simulations found such violation, but not in the predicted direction. Selke and Shchur tested the square lattice. Here we check only this universality for the susceptibility ratio near the critical point. For this purpose we study first the standard Ising model on a simple cubic lattice with six nearest neighbours, then with six nearest and twelve next-nearest neighbours, and compare the results with the Chen-Dohm lattice of six nearest neighbours and only half of the twelve next-nearest neighbours. We do not confirm the violation of universality found by Schulte and Drope in the susceptibility ratio.Comment: 6 pages including 4 figures, Physica A, in pres

    Fractal atomic-level percolation in metallic glasses

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    Metallic glasses are metallic alloys that exhibit exotic material properties. They may have fractal structures at the atomic level, but a physical mechanism for their organization without ordering has not been identified. We demonstrated a crossover between fractal short-range (<2 atomic diameters) and homogeneous long-range structures using in situ x-ray diffraction, tomography, and molecular dynamics simulations. A specific class of fractal, the percolation cluster, explains the structural details for several metallic-glass compositions. We postulate that atoms percolate in the liquid phase and that the percolating cluster becomes rigid at the glass transition temperature
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