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  • 2000-2004  (13)
  • 1975-1979  (5)
  • 1930-1934  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Speed-dependent line profile: A test of a unified model from the Doppler to the collisional regime for molecule–molecule collisions (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 4951-4956 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: A speed-dependent line profile combining soft and hard fully correlated Dicke-narrowing collisions was recently successfully tested on Ar-broadened H2 spectra in a wide density and temperature range. A further test for mixtures of H2 in nitrogen molecules (instead of Ar atoms) is presented. This test is also based on high resolution Raman investigation of the isotropic Q(1) line of H2 from low to high density at various temperatures. The same consistency of the speed-dependent line profile as for H2–Ar is obtained for H2–N2 through a remarkable agreement with all the data by using a unique set of four parameters (the collisional width and shift, the kinetic frequency, and a characteristic velocity memory parameter). The present study is a preliminary step for the hydrogen CARS thermometry in H2–air flames at high pressure. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1287824
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  • 2
    Digitale Medien
    Digitale Medien
    Collisional effects on spectral line shape from the Doppler to the collisional regime: A rigorous test of a unified model (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 158-166 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The paper presents high resolution Raman investigations of the Q(1) line of H2 in Ar mixture from low density (Doppler regime) to high density (collisional regime) analyzed with a unique line shape profile. Measurements are performed by stimulated Raman gain spectroscopy between 300 and 1000 K in a wide density range (from 0.2 to 11 amagat). All the observed spectral features are accurately described by a unified model recently proposed by two of the authors. This model accounts for a velocity-memory process, not restricted to the usual hard and soft limits. It also includes correlation between velocity- and phase-changing collisions. An exhaustive analysis of various possible mechanisms on the line shape is achieved. These mechanisms are the Dicke narrowing, the radiator speed dependence of the collisional broadening and shifting parameters, the collisionally induced speed-class exchange and the nonimpact effect. The present test shows the high consistency of the unified model, since it allows one to get a remarkable agreement with all the data by using a unique set of parameters. This model should be useful for optical diagnostics at moderate density, as required for combusting media or atmospheric work. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.480570
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  • 3
    facet.materialart.
    Unbekannt
    Pfeiffer, M.: Elements of Kurux historical Phonology (Book Review) (1977)
    Berlin : Periodicals Archive Online (PAO)
    Orientalistische Literaturzeitung. 72:5 (1977:Sept./Okt.) 520 
    Details
    ISSN: 0030-5383
    Thema: Allgemeine und vergleichende Sprach- und Literaturwissenschaft. Indogermanistik. Außereuropäische Sprachen und Literaturen , Ethnologie , Geschichte
    Notizen: Besprechungen
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4148-1977-072-05-000024
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  • 4
    facet.materialart.
    Unbekannt
    Burrow, T., and S. Bhattacharya: The Pengo Language (Book Review) (1975)
    Berlin : Periodicals Archive Online (PAO)
    Orientalistische Literaturzeitung. 70:4 (1975:Juli/Aug.) 403 
    Details
    ISSN: 0030-5383
    Thema: Allgemeine und vergleichende Sprach- und Literaturwissenschaft. Indogermanistik. Außereuropäische Sprachen und Literaturen , Ethnologie , Geschichte
    Notizen: Besprechungen
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4148-1975-070-04-000004
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  • 5
    Digitale Medien
    Digitale Medien
    Small-angle X-ray studies of the scaffold in bacteriophage λ head formation (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 496-497 
    Details
    ISSN: 1600-5767
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Geologie und Paläontologie , Physik
    Notizen: The pathway of bacteriophage λ head formation has been well characterized in vivo and in vitro (Hohn, Katsura & Hohn, 1977). First a petit λ particle consisting of a shell protein pE, a protein pNu3 and minor proteins, but lacking DNA, is formed. The pNu3-containing structure is then converted to a structure which does not contain pNu3, and which is capable of taking up and cutting the viral DNA. The purpose of this work is to determine the scaffold structure, formed by pNu3, by small-angle scattering techniques based on the known physico-chemical properties of pNu3-containing and pNu3-lacking particles (Künzler & Hohn, 1978). The scaffold is found to be inside the protein shell but less concentrated than the 130 Å radius core reported from electron micrographs.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0021889878013710
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  • 6
    Digitale Medien
    Digitale Medien
    Gefäßchirurgie – Quo vadis? (2000)
    Springer
    Gefässchirurgie 5 (2000), S. 1-3 
    Details
    ISSN: 1434-3932
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00010569
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  • 7
    Digitale Medien
    Digitale Medien
    Optical properties of the quasi-two-dimensional dichalcogenides 2H-TaSe and 2H-NbSe (2003)
    Springer
    The European physical journal 33 (2003), S. 15-23 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 78.20.-e Optical properties of bulk materials and thin films – 71.45.Lr Charge-density-wave systems – 74.25.Gz Optical properties
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We present a comprehensive analysis of the optical constants of the two-dimensional dichalcogenide materials 2 H - TaSe 2 and 2 H - NbSe 2 , in an attempt to address the physics of two-dimensional correlated systems. The title compounds were studied over several decades in frequency, from the far-infrared to the ultraviolet. Measurements with linearly polarized light have allowed us to obtain both the in-plane and out-of-plane components of the conductivity tensor. Although the electromagnetic response of dichalcogenides is strongly anisotropic, both the in-plane and out-of-plane components of the conductivity tensor share many common features, including the presence of a well-defined metallic component, as well as a “mid-infrared band”. We discuss the implications of these results in the context of the spectroscopic results of other classes of low-dimensional conductors such as the high-temperature superconducting cuprates. In particular, the analysis of the redistribution of the spectral weight as a function of temperature, as well as the behavior of the quasiparticles relaxation rate, points to significant distinctions between the charge dynamics of dichalcogenides and other classes of low dimensional conductors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2003-00136-1
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  • 8
    Digitale Medien
    Digitale Medien
    Specific heats of the charge density wave compounds o-TaS and (TaSe ) I (2002)
    Springer
    The European physical journal 29 (2002), S. 71-77 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 71.45.Lr Charge-density-wave systems – 65.40.Ba Heat capacity – 64.70.Kb Solid solid transitions – 64.70.Pf Glass transitions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Specific heats of the charge-density-wave compounds o-TaS3 and (TaSe4)2I have been measured over the wide temperature interval 10 K-300 K. Both systems exhibit strong non-Debye behavior. Very weak and broad anomalies are observed at the Peierls transition temperatures. For o-TaS3, the change in the curvature of the specific heat occurs at temperature of 40 K where glass transition has been deduced from dielectric measurements, and an extended scaling analysis suggests that the glass transition is associated with a dynamical cross over in length scales. We briefly discuss the characteristics and physical origins of the anomalies at both the Peierls and glass transitions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2002-00263-1
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  • 9
    Digitale Medien
    Digitale Medien
    Infrared spectroscopy of tetrahedral quantum spin systems Cu $\mathsf{_2}$ Te $\mathsf{_2}$ O $\mathsf{_5}$ X $\mathsf{_2}$ (X = Br and Cl) (2004)
    Springer
    The European physical journal 38 (2004), S. 65-70 
    Details
    ISSN: 1434-6036
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. Cu2Te2O5X2, with X = Br and Cl, are spin-tetrahedral systems displaying magnetic ordering at low temperatures. We have performed optical reflectivity measurements over a broad spectral range as a function of temperature and magnetic field. We have identified the resonance frequencies of the infrared optically active phonon modes and estimated the value of the electronic gap in both tellurate compounds. No variation of the spectra has been observed while crossing the magnetic ordering transition temperature or by applying a magnetic field. The implications of these findings are discussed in relation to the nature of the phase transition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2004-00100-7
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  • 10
    Digitale Medien
    Digitale Medien
    Hydrogen CARS thermometry in H2–N2 mixtures at high pressure and medium temperatures: influence of linewidths models (2000)
    Springer
    Applied physics 70 (2000), S. 447-454 
    Details
    ISSN: 1432-0649
    Schlagwort(e): PACS: 33.20; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. In order to improve the accuracy of H2 CARS thermometry, H2 Q-branch CARS spectra have been recorded for various H2–N2 mixtures in a high-pressure cell at different pressures and temperatures (up to 40 bar and 875 K). Due to the low spectral resolution of broadband CARS experiments, the relevant spectral lineshape factor is the linewidth ratio Γ(Q(3))/Γ(Q(1)), since Q(1) and Q(3) are the most intense lines of the Q-branch spectrum in this temperature range. For the first time, the speed-inhomogeneous effects are accounted for in the simulation of the CARS profiles. The evaluated temperatures are in good agreement with reference values obtained by thermocouples. The specific role on the accuracy of H2 CARS thermometry of the speed inhomogeneity is carefully analyzed, in connection with the influence of the nitrogen concentration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003400050071
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