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  • 1995-1999  (162)
  • 1985-1989  (100)
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  • 11
    Electronic Resource
    Electronic Resource
    Studies of the change of a metallic surface microrelief as a result of multiple-pulse action of powerful UV laser pulses (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3909-3913 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The formation of specific structural patterns as a result of the repeated UV laser irradiation on various metallic samples (Ag, Al, Au, bronze, Cu, and Pb) is reported. The physical processes underlying the formation of more or less organized periodical structures in this case are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335611
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  • 12
    Electronic Resource
    Electronic Resource
    Hidden supersymmetry and Berezin quantization of N=2, D=3 spinning superparticles (1999)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 40 (1999), S. 2230-2253 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The first quantized theory of N=2, D=3 massive superparticles with arbitrary fixed central charge and (half) integer or fractional superspin is constructed. The quantum states are realized on the fields carrying a finite-dimensional, or a unitary infinite-dimensional, representation of the supergroups OSp (2|2) or SU (1,1|2). The construction originates from quantization of a classical model of the superparticle we suggest. The physical phase space of the classical superparticle is embedded in a symplectic superspace T*(R1,2)×L1|2, where the inner Kähler supermanifold L1|2≅OSp(2|2)/[U(1)×U(1)]≅SU(1,1|2)/[U(2|2)×U(1)] provides the particle with superspin degrees of freedom. We find the relationship between Hamiltonian generators of the global Poincaré supersymmetry and the "internal" SU(1,1|2) one. Quantization of the superparticle combines the Berezin quantization on L1|2 and the conventional Dirac quantization with respect to space–time degrees of freedom. Surprisingly, to retain the supersymmetry, quantum corrections are required for the classical N=2 supercharges as compared to the conventional Berezin method. These corrections are derived and the Berezin correspondence principle for L1|2 underlying their origin is verified. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.532861
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  • 13
    Electronic Resource
    Electronic Resource
    Lateral self-limitation in the laser-induced oxidation of ultrathin metal films (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2816-2818 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: cw-laser-induced local oxidation of ultrathin (3–60 nm) titanium films on glass in air is studied. It is shown, that the brightening of the films upon through-oxidation forms a negative feedback to this highly nonlinear process. It offers the possibility of stable writing of oxide line structures narrower than the diffraction limited focused laser spot. The optimum metal film thickness is of the order of the light absorption length in the metal. Transparent isolated oxide lines and gratings with periods down to 250 nm and line width down to 165 nm were recorded in 6–15 nm thick Ti films on glass by using the radiation of the Ar ion laser (λ=488, 514 nm). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116853
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  • 14
    Electronic Resource
    Electronic Resource
    Grafted macromolecules with adsorbing ends (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 2119-2126 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using a self-consistent field approach we analyze the equilibrium characteristics of macromolecules grafted at one end onto a planar surface and having an adsorbing group at the second end. Three different systems are considered: (1) isolated end-adsorbing Gaussian chain, (2) end-adsorbing chains admixed into a polymer brush with nonadsorbing free ends, and (3) polymer brush formed by the end-adsorbing macromolecules. The dependences of the average height and dispersion of the adsorbing ends are calculated as functions of the adsorption energy and the chain length. The experimental results on relevant systems are discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472044
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  • 15
    Electronic Resource
    Electronic Resource
    Free energy of embryo formation for heterogeneous multicomponent nucleation (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 10035-10045 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An approach for calculating the free energy of embryo formation for multicomponent heterogeneous nucleation has been developed. The approach is based on a differential version of the capillarity approximation. It is considered that a liquid droplet is formed due to the deposition of several gaseous compounds onto a nucleus containing a spherical insoluble core and nonvolatile soluble substances. The approach links interfacial free energies of the surfaces, the size of the insoluble core, and chemical characteristics of the substances with the free energy of the embryo formation. The free energy of embryo formation as well as the critical supersaturation are influenced by the ratios of the Henry's Law constants to the partial pressures of the species. Multicomponent nucleation with a dominant species can be described as a quasibinary nucleation of the dominant species and a virtual species. As an example, the free energy in a binary system of water and acid is considered. It is shown that water+acid nucleation on such nuclei is influenced by the acid, soluble nonvolatile compounds and insoluble substances. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478877
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  • 16
    Electronic Resource
    Electronic Resource
    Nanostructuring of Laser-Deposited Ti Films by Self-Limited Oxidation (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Ceramic Society 80 (1997), 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: Local laser-induced oxidation of thin titanium films on glass is shown to be self-limiting due to a decrease in the absorptivity during the reaction. Taking advantage of this confinement, stable writing of transparent oxide line structures narrower than the diffraction-limited focused spot of a continuous wave Ar ion laser (500 nm) has been accomplished. The greatest optical contrast (1:10) with the highest resolution down to 165 nm was observed if the film thickness is of the order of the light absorption length in the metal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1997.tb03035.x
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  • 17
    Electronic Resource
    Electronic Resource
    Dynamics of haemoglobin (1996)
    [s.l.] : Nature Publishing Group
    Nature 383 (1996), S. 30-31 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR á€" Jia et al describe a possible physiological role of nitrosylated haemoglobin, postulating a dynamic cycle in which oxygenated haemoglobin in arterial blood is S-nitrosylated and the NO group is released to bind to the haem of deoxygenated haemoglobin during arterial-venous ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/383030b0
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  • 18
    Electronic Resource
    Electronic Resource
    Prompt neutrino production in 400 GeV proton-copper interactions (1988)
    Springer
    The European physical journal 40 (1988), S. 497-522 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new beam-dump experiment has been performed at the CERN Super Proton Synchrotron using the CHARM neutrino detector. The instrumentation and the statistics have been significantly improved with respect to earlier experiments. For a neutrino energy above 20 GeV the asymmetry of the prompt muon-neutrino and electron-neutrino fluxes $$[(v_\mu + \bar v_\mu ) - (v_e + \bar v_e )]/[(v_\mu + \bar v_\mu ) + (v_e + \bar v_e )]$$ is found to be 0.20±0.10 (stat.)±0.05 (syst.), and the asymmetry of prompt antineutrino and neutrino fluxes for muonneutrinos $$(v_\mu - \bar v_\mu )/(v_\mu + \bar v_\mu )$$ is 0.02±0.16 (stat.)±0.02 (syst.) in agreement with our previous results. For the cross-section times branching ratio for charm production and semileptonic decay we obtain a value of $$\sigma \times BR\left[ {D(\bar D) \to v_e (\bar v_e ) X} \right] = 1.9 \pm 0.2 \pm 0.2\mu b$$ per nucleon. We find no evidence forv τ orv x interactions. The $$(v_\tau + \bar v_\tau )$$ flux is less than 21% of the total prompt neutrino flux. We derive an improved limit on the branching ratio $$\pi ^0 \to v\bar v$$ of 6.5×10−6, and as a verification of the universality of the neutral weak coupling we find $$g_{v_e \bar v_e } /g_{v_\mu \bar v_\mu } = 1.05_{ - 0.18}^{ + 0.15} $$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560221
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  • 19
    Electronic Resource
    Electronic Resource
    Structural investigations of laser-deposited Fe/Al multilayers (1999)
    Springer
    Applied physics 68 (1999), S. 497-503 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.55.-a
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Fe/Al multilayers are prepared by crossed-beam pulsed laser deposition and investigated by Rutherford backscattering, conversion electron Mössbauer spectroscopy, and transmission electron microscopy. The results are compared to purely ballistic simulations of the deposition process using the TRIDYN4.0 code. It is found that the intermixing of adjacent layers must be described in terms of ballistic mixing followed by chemical mixing. The phase formation in the transition layer between adjacent layers follows the non-equilibrium behavior of Fe/Al in analogy to investigations on mechanically alloyed and ion-beam-mixed Fe/Al. In Fe-rich areas a bcc solid solution is formed. In Al-rich environment an amorphous phase is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050932
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  • 20
    Electronic Resource
    Electronic Resource
    Features of the film-growth conditions by cross-beam pulsed-laser deposition (1999)
    Springer
    Applied physics 69 (1999), S. 353-358 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.15.Fg; 52.50.Jm; 42.62.Hk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Spatial and energetic characteristics of the plasma plume by cross-beam pulsed-laser deposition (CBPLD) were investigated. Effective droplets filtering together with high efficiency of material usage are observed by this approach. Time-of-flight (TOF) technique with electrostatic ion collectors (Langmuir probes operating in the ion-collecting mode) were applied to obtain kinetic energy distribution functions of ionized particles and to compare the ionization degrees of the plasma by the CBPLD and by the conventional PLD. The average and maximum kinetic energies of the ions by the CBPLD are found to be 2–3 times lower as compared to the conventional PLD. At the same time, the fraction of ionized species and highly exited neutrals (Rydberg atoms) in the CBPLD plasma is 1.5–2 times larger in comparison to the conventional approach. Re-sputtering of the material of the growing film by fast ions is a considerable effect in both the PLD methods by the chosen experimental conditions. The angular width of the directional pattern of the plasma plume by CBPLD is comparable to that typical for the conventional PLD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051013
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