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  • 1
    Electronic Resource
    Electronic Resource
    Height of the energy barrier existing between cathodes and hydroxyquinoline–aluminum complex of organic electroluminescence devices (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 264-268 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The properties of organic electroluminescence devices are largely affected by the kind of metals used as the cathode, because the barrier height formed at the interface depends on the electronic and chemical properties of the metals. On the basis of the temperature dependence of currents flowing through the interface between tris(8-hydroxyquinolino)aluminum and a magnesium cathode, the carrier injection mechanism at the interface was ascribed to the thermionic emission with the barrier height of about 0.58±0.03 eV at zero electric field. The barrier height became larger when metals with larger work functions were used as the cathode. The current density was also found to be dependent on the chemical structure of the interfaces. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360940
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  • 2
    Electronic Resource
    Electronic Resource
    Superconductivity of Ca(Al0.5,Si0.5)2, a ternary silicide with the AlB2-type structure (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 1019-1021 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A ternary silicide Ca(Al0.5,Si0.5)2 was prepared by Ar arc melting. Powder x-ray diffraction measurement indicates that it has the AlB2-type structure with lattice constants of a=4.1905(5) and c=4.3992(8) Å, where Si and Al atoms are arranged in the disordered honeycomb lattice and Ca atoms are intercalated between them. The silicide is isostructural with a superconductor MgB2. Electrical resistivity and dc magnetization measurements revealed that it is a superconductor with a TC of 7.7 K. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1448857
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  • 3
    Electronic Resource
    Electronic Resource
    Study of dipole interaction in micron-width NiFe/Cu/NiFe/NiO wire using exchange anisotropy (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 4007-4009 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dipole interaction between a NiFe layer pinned by a NiO and a free NiFe layer in a micron-wide NiFe/Cu/NiFe/NiO wire was studied by changing the direction of the exchange bias from the NiO layer. The effect of the dipole interaction when the exchange bias was perpendicular to the wire axis was larger than that when the exchange bias was parallel to the wire axis, and was consistently explained by the stray field caused by the magnetic charges of the pinned layer. It was demonstrated that this method, using exchange anisotropy, is useful for investigating the dipole interaction between ferromagnetic materials separated by a nonmagnetic material in small-scale magnetic multilayers. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1380238
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  • 4
    Electronic Resource
    Electronic Resource
    Auger Electron Spectroscopy Analysis of Cross-Section Surface of Oxidized Titanium Carbide Single Crystal (2003)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 86 (2003), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A TiC monocrystal was heated by three thermal cycles with isotherm at 1108 K while exposed to Ar/O2 mixtures respectively with O2 contents of 239, 1.0, and 324 ppm. The reactivity was detected with a homemade device based on two identical solid electrolyte oxygen sensors connected to a quadrupole mass spectrometer (QMS). The oxidized sample was cleaved by impact bending under high vacuum and the cross section investigated by Auger electron spectroscopy (AES) and scanning electron microscopy (SEM) techniques. Both area and profile AES spectra were acquired by using a 70 nm diameter beam. Spectral changes have been analyzed to identify chemical species present at the TiC/TiO2 interface. A model for high-temperature oxidation of TiC has been proposed. It implies oxygen diffusion through a protective TiO2 layer and the existence of two inner interfaces: TiC/TiC1−xOx and TiC1−xOx/TiO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2003.tb03618.x
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  • 5
    Electronic Resource
    Electronic Resource
    Impaired function of p53R2 in Rrm2b -null mice causes severe renal failure through attenuation of dNTP pools (2003)
    [s.l.] : Nature Publishing Group
    Nature genetics 34 (2003), S. 440-445 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] p53R2, which is regulated by tumor suppressor p53, is a small subunit of ribonucleotide reductase. To determine whether it is involved in DNA repair by supplying deoxyribonucleotides (dNTPs) for resting cells in vivo, we generated a strain of mice lacking Rrm2b (encoding p53R2). These mice ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng1212
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  • 6
    Electronic Resource
    Electronic Resource
    Generalized classical BRST cohomology and reduction of Poisson manifolds (1993)
    Springer
    Communications in mathematical physics 151 (1993), S. 155-182 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract In this paper, we formulate a generalization of the classical BRST construction which applies to the case of the reduction of a Poisson manifold by a submanifold. In the case of symplectic reduction, our procedure generalizes the usual classical BRST construction which only applies to symplectic reduction of a symplectic manifold by a coisotropic submanifold, i.e. the case of reducible “first class” constraints. In particular, our procedure yields a method to deal with “second-class” constraints. We construct the BRST complex and compute its cohomology. BRST cohomology vanishes for negative dimension and is isomorphic as a Poisson algebra to the algebra of smooth functions on the reduced Poisson manifold in zero dimension. We then show that in the general case of reduction of Poisson manifolds, BRST cohomology cannot be identified with the cohomology of vertical differential forms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02096751
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  • 7
    Electronic Resource
    Electronic Resource
    The BRST cohomology of the NSR string: Vanishing and “no-ghost” theorems (1989)
    Springer
    Communications in mathematical physics 124 (1989), S. 105-132 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We investigate the BRST cohomology of the NSR string. We prove vanishing theorems for the full and relative (sub)complexes generalizing the work of Frenkel, Garland and Zuckerman for the bosonic string. Using these results we give simple proofs of the “no-ghost” theorems for both sectors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01218471
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  • 8
    Electronic Resource
    Electronic Resource
    Geometric BRST quantization, I: Prequantization (1991)
    Springer
    Communications in mathematical physics 136 (1991), S. 209-229 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract This is the first part of a two-part paper dedicated to the definition of BRST quantization in the framework of geometric quantization. After recognizing prequantization as a manifestation of the Poisson module structure of the sections of the prequantum line bundle, we define BRST prequantization and show that it is the homological analog of the symplectic reduction of prequantum data. We define a prequantum BRST cohomology theory and interpret it in terms of geometric objects. We then show that all Poisson structures correspond under homological reduction. This allows to prove, in the BRST context, that prequantization and reduction commute.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02100022
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  • 9
    Electronic Resource
    Electronic Resource
    On operad structures of moduli spaces and string theory (1995)
    Springer
    Communications in mathematical physics 171 (1995), S. 1-25 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We construct a real compactification of the moduli space of punctured rational algebraic curves and show how its geometry yields operads governing homotopy Lie algebras, gravity algebras and Batalin-Vilkovisky algebras. These algebras appeared recently in the context of string theory, and we give a simple deduction of these algebraic structures from the formal axioms of conformal field theory and string theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02103769
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  • 10
    Electronic Resource
    Electronic Resource
    The Universal Vassiliev Invariant for the Lie Superalgebra (1997)
    Springer
    Communications in mathematical physics 185 (1997), S. 93-127 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: We compute the universal weight system for Vassiliev coming from the Lie superalgebra $ applying the construction of [13]. This weight system is a function from the space of chord diagrams to the center Z of the universal enveloping algebra of $ , and we find a combinatorial expression for it in terms of the standard generators of Z. The resulting knot invariants generalize the Alexander-Conway polynomial.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002200050083
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