17,455 research outputs found

    Female Gender Stereotypes and Inequality within Ursula Vernon’s Jackalope Wives and David K. Yeh’s Cottage Country

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    Historically, fairy tales attempt to bring forth issues of femininity, typically surrounding domestic violence, oppression, as well as unequal gender relations. This paper attempts to utilize Ursula Vernon’s Jackalope Wives, as well as David K. Yeh’s Cottage Country to exemplify the ways in which modern fairy tales conform and reject previous notions of what it means to be a woman within fantasy. Furthermore, through analyzing content presented within both texts, this paper acknowledges their differing, yet failed attempts to abolish gendered stereotypes within literature, raising concern as to whether such social issues are so easily overcome

    Sound velocity and absorption measurements under high pressure using picosecond ultrasonics in diamond anvil cell. Application to the stability study of AlPdMn

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    We report an innovative high pressure method combining the diamond anvil cell device with the technique of picosecond ultrasonics. Such an approach allows to accurately measure sound velocity and attenuation of solids and liquids under pressure of tens of GPa, overcoming all the drawbacks of traditional techniques. The power of this new experimental technique is demonstrated in studies of lattice dynamics, stability domain and relaxation process in a metallic sample, a perfect single-grain AlPdMn quasicrystal, and rare gas, neon and argon. Application to the study of defect-induced lattice stability in AlPdMn up to 30 GPa is proposed. The present work has potential for application in areas ranging from fundamental problems in physics of solid and liquid state, which in turn could be beneficial for various other scientific fields as Earth and planetary science or material research

    Near- And Mid-Infrared Imaging Study of Young Stellar Objects around LkHα\alpha 234

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    We present high-resolution (0\farcs2) near-infrared images of the area surrounding the Herbig Be star LkHα\alpha 234 taken with the Coronagraphic Imager with Adaptive Optics (CIAO) and the adaptive optics on the Subaru Telescope. The near-infrared (JJ, HH, KK, LL' and MM' bands) images reveal circumstellar structures around LkHα\alpha 234 in detail. Eight young stellar object (YSO) candidates (Object B, C, D, E, F, G, NW1, and NW2) were detected at 2\arcsec--11\arcsec from LkHα\alpha 234. Objects B and C are likely variable stars, which is consistent with a young evolutionary status. Three objects (LkHα\alpha 234, NW1, and NW2) were identified in the 11.8 \micron (SiC) and 17.65 \micron images obtained with the Long Wavelength Spectrometer (LWS) on the Keck Telescope. NW1 and NW2 are thought to be embedded young stars. We suggest that NW1 and not LkHα\alpha 234 is the source illuminating the reflection nebula west of LkHα\alpha 234, although Object G may be another candidate. In our images, these objects are located at the center of the 2 \micron polarization, and NW1 resides at the center of a monopolar cavity. The SED of NW1 suggests that it is a YSO with a spectral type of B6--7. Object F and G were discovered by our observations at 1\farcs9 and 2\farcs3, respectively, from LkHα\alpha 234, and their proximity to LkHα\alpha 234 suggests that they may be its lower-mass companions.Comment: 22 pages, 7 figures, accepted for publication in PASJ (Vol.63 No. 4

    Quantum Gravity Phenomenology, Lorentz Invariance and Discreteness

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    Contrary to what is often stated, a fundamental spacetime discreteness need not contradict Lorentz invariance. A causal set's discreteness is in fact locally Lorentz invariant, and we recall the reasons why. For illustration, we introduce a phenomenological model of massive particles propagating in a Minkowski spacetime which arises from an underlying causal set. The particles undergo a Lorentz invariant diffusion in phase space, and we speculate on whether this could have any bearing on the origin of high energy cosmic rays.Comment: 13 pages. Replaced version with corrected fundamental solution, missing m's (mass) and c's (speed of light) added and reference on diffusion on the three sphere changed. Note with additional references added and addresses updated, as in published versio

    Work distribution functions for hysteresis loops in a single-spin system

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    We compute the distribution of the work done in driving a single Ising spin with a time-dependent magnetic field. Using Glauber dynamics we perform Monte-Carlo simulations to find the work distributions at different driving rates. We find that in general the work-distributions are broad with a significant probability for processes with negative dissipated work. The special cases of slow and fast driving rates are studied analytically. We verify that various work fluctuation theorems corresponding to equilibrium initial states are satisfied while a steady state version is not.Comment: 9 pages, 15 figure

    Observation of atom pairs in spontaneous four wave mixing of two colliding Bose-Einstein Condensates

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    We study atom scattering from two colliding Bose-Einstein condensates using a position sensitive, time resolved, single atom detector. In analogy to quantum optics, the process can also be thought of as spontaneous, degenerate four wave mixing of de Broglie waves. We find a clear correlation between atoms with opposite momenta, demonstrating pair production in the scattering process. We also observe a Hanbury Brown and Twiss correlation for collinear momenta, which permits an independent measurement of the size of the pair production source and thus the size of the spatial mode. The back to back pairs occupy very nearly two oppositely directed spatial modes, a promising feature for future quantum optics experiments.Comment: A few typos have been correcte

    Hanbury Brown and Twiss correlations in atoms scattered from colliding condensates

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    Low energy elastic scattering between clouds of Bose condensed atoms leads to the well known s-wave halo with atoms emerging in all directions from the collision zone. In this paper we discuss the emergence of Hanbury Brown and Twiss coincidences between atoms scattered in nearly parallel directions. We develop a simple model that explains the observations in terms of an interference involving two pairs of atoms each associated with the elementary s wave scattering process.Comment: Minor corrections. reference update

    A superfluid He3 detector for direct dark matter search

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    MACHe3 (MAtrix of Cells of superfluid He3) is a project of a new detector for direct Dark Matter Search. The idea is to use superfluid He3 as a sensitive medium. The existing device, the superfluid He3 cell, will be briefly introduced. Then a description of the MACHe3 project will be presented, in particular the background rejection and the neutralino event rate that may be achieved with such a device.Comment: 6 pages, 3 figures, Proceedings of the 3rd International Workshop on the Identification of Dark Matter (York, UK, 09/18/2000-09/22/2000
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