6,029 research outputs found

    Critical Casimir effect and wetting by helium mixtures

    Get PDF
    We have measured the contact angle of the interface of phase-separated 3^{3}He-4^{4}He mixtures against a sapphire window. We have found that this angle is finite and does not tend to zero when the temperature approaches TtT_t, the temperature of the tri-critical point. On the contrary, it increases with temperature. This behavior is a remarkable exception to what is generally observed near critical points, i.e. "critical point wetting''. We propose that it is a consequence of the "critical Casimir effect'' which leads to an effective attraction of the 3^{3}He-4^{4}He interface by the sapphire near TtT_{t}.Comment: submitted july 13 (2002), published march 20 (2003

    A class of integrable lattices and KP hierarchy

    Full text link
    We introduce a class of integrable ll-field first-order lattices together with corresponding Lax equations. These lattices may be represented as consistency condition for auxiliary linear systems defined on sequences of formal dressing operators. This construction provides simple way to build lattice Miura transformations between one-field lattice and ll-field (l2l\ge 2) ones. We show that the lattices pertained to above class is in some sense compatible with KP flows and define the chains of constrained KP Lax operators.Comment: LaTeX, 13 pages, accepted for publication in J. Phys. A: Math. Ge

    Valence bands of poly(methylmethacrylate) and photoion emission in vacuum ultraviolet region

    Get PDF
    Photoion and photoelectron yields were measured for poly(methylmethacrylate) in the photon energy region of 8–40 eV using synchrotron radiation. Further, the valence‐band structure was investigated with ultraviolet photoelectron spectra and valence effective Hamiltonian calculations. A significant difference was observed between the photon energy dependencies of photoion and photoelectron yields. The threshold energy for photoion emission was found to be 10.5 eV, while that for photoelectron emission was 8.5 eV, indicating holes created near the valence‐band top do not contribute to the ion emission. At the higher‐energy region, the ion emission efficiency was found to be enhanced in the photon energy region of 17–28 eV. The difference between the threshold energies of photoion and photoelectron emission and the enhancement of the photoion emission are discussed in conjunction with the valence‐band [email protected] ; [email protected]

    Chromospheric Anemone Jets as Evidence of Ubiquitous Reconnection

    Full text link
    The heating of the solar chromosphere and corona is a long-standing puzzle in solar physics. Hinode observations show the ubiquitous presence of chromospheric anemone jets outside sunspots in active regions. They are typically 3 to 7 arc seconds = 2000 to 5000 kilometers long and 0.2 to 0.4 arc second = 150 to 300 kilometers wide, and their velocity is 10 to 20 kilometers per second. These small jets have an inverted Y-shape, similar to the shape of x-ray anemone jets in the corona. These features imply that magnetic reconnection similar to that in the corona is occurring at a much smaller spatial scale throughout the chromosphere and suggest that the heating of the solar chromosphere and corona may be related to small-scale ubiquitous reconnection.Comment: 10 pages, 5 figure

    Fulminant hepatitis after allogenic bone marrow transplantation caused by reactivation of hepatitis B virus with gene mutations in the core promotor region

    Get PDF
    The definitive version is available at www.blackwell-synergy.com.ArticleEUROPEAN JOURNAL OF HAEMATOLOGY. 77(3): 255-258 (2006)journal articl

    Thin Ice Target for 16^{16}O(p,p') experiment

    Full text link
    A windowless and self-supporting ice target is described. An ice sheet with a thickness of 29.7 mg/cm2^2 cooled by liquid nitrogen was placed at the target position of a magnetic spectrometer and worked stably in the 16^{16}O(p,p)(p,p') experiment at Ep=392E_{p}=392 MeV. Background-free spectra were obtained.Comment: 14 pages, 4 figures, Nucl. Instr. & Meth. A (in press
    corecore