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1976 (300)
181Author    H. Lutz, H. DreizlerRequires cookie*
 Title    Torsion-Torsion Interaction in the Microwave Spectrum of Dimethylether  
 Abstract    We report an analysis of the torsional fine structure of rotational lines of (CH3)20 in excited torsional states leading to the potential parameters V 3 and P12 of a Hamil-tonian for the overall-and internal rotation. 
  Reference    (Z. Naturforsch. 31a, 1026—1028 [1976]; received May 10 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1026_n.pdf 
 Identifier    ZNA-1976-31a-1026_n 
 Volume    31 
182Author    L. WaldmannRequires cookie*
 Title    Time Reversal Behaviour and Reciprocity Theorem of Transport-Relaxation-Equations  
 Abstract    The coefficient matrices in the transport-relaxation-equations (moment equations of generalized thermo-hydrodynamics) depend on the polynomials used in the expansion of the underlying kinetic equation. The known behaviour under time reversal of these polynomials, Eq. (7), entails sym-metries of the fore-mentioned coefficient matrices, Eqs. (12) and (16). From these symmetries a reciprocity theorem for two stationary solutions of the transport-relaxation-equations is derived, Eqs. (21 a und b) : the divergence of a certain vector field, bilinear in the two solutions, vanishes. The relaxation matrix does not appear in this form. The theorem is useful for investigating the pro-liferation of the Onsager symmetries from the basic differential equations into the linear algebraic relations between the few global quantities governing "discontinuous systems". A simple example in heat conduction is worked out. A more complicated case and the role of a magnetic field are briefly considered. Equivalent with (21 a) is the kinetic reciprocity theorem (40). 
  Reference    (Z. Naturforsch. 31a, 1029—1033 [1976]; received July 1 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1029.pdf 
 Identifier    ZNA-1976-31a-1029 
 Volume    31 
183Author    Siegfried HessRequires cookie*
 Title    Fokker-Planck-Equation Approach to Flow Alignment in Liquid Crystals  
 Abstract    A nonlinear inhomogeneous relaxation equation for the alignment tensor is derived from a Fokker-Planck-equation for the orientational distribution function where torques exerted by a molecular field and by the gradient of the flow velocity are taken into account. Phenomenological coefficients characterizing the flow alignment in the isotropic and in the nematic phases are related to molecular parameters. 
  Reference    (Z. Naturforsch. 31a, 1034—1037 [1976]; received June 18 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1034.pdf 
 Identifier    ZNA-1976-31a-1034 
 Volume    31 
184Author    J. R. SarafRequires cookie*
 Title      
 Abstract    A kinetic model for a weakly-ionized plasma interacting with radiation is proposed based on the energy-momentum method, in which both energy and momentum of the system are conserved. The radiation-initiated ionization is obtained in a non-inertial coordinate system, and the proposed model satisfies the H-theorem. 
  Reference    (Z. Naturforsch. 31a, 1038—1041 [1976]; received May 19 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1038.pdf 
 Identifier    ZNA-1976-31a-1038 
 Volume    31 
185Author    S. Popović, N. KonjevićRequires cookie*
 Title    On the Thermal Conductivity of Hydrogen at Elevated Temperatures  
 Abstract    To evaluate the thermal conductivity of a hydrogen plasma at atmospheric pressure, previously reported results of experimental end-on spectroscopic temperature measurements are corrected for the influence of the schlieren effect. New thermal conductivity data for hydrogen are given. 
  Reference    (Z. Naturforsch. 31a, 1042—1045 [1976]; received July 5 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1042.pdf 
 Identifier    ZNA-1976-31a-1042 
 Volume    31 
186Author    0. Lutz, W. Nepple, A. NolleRequires cookie*
 Title    Indirect Spin-Spin Coupling Between 17 0 and Other Quadrupolar Nuclei in Oxyanions  
 Abstract    Fourier transform NMR studies of 17 0, 35 C1, 51 V, 53 Cr, 55 Mn and 95 Mo are reported for aqueous solutions of the oxyanions C104~, V04 3-, Cr04 2-, Mn04~, and Mo04 2 ~, partly enriched in 17 0. The indirect spin-spin coupling constant between 17 0 and the quadrupolar central nucleus is determined: /(i7o_35C1)r=(8L4 + 4.0) Hz? /(i7o_5iy) = (61.6±2.5) Hz, /(17 0-^Cr) = (10±2) Hz, /(17 Q — 55 Mn) = (28.9±2.8) Hz and /(17 Q-95 Mo) = (40.5±0.8) Hz. A linear dependence of the reduced coupling constants on the atomic number of the central nucleus in the isoelectronic series V04 3-, Cr04 2-and Mn04" was found. 
  Reference    (Z. Naturforsch. 31a, 1046—1050 [1976]; received June 21 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1046.pdf 
 Identifier    ZNA-1976-31a-1046 
 Volume    31 
187Author    H. Güsten, L. Klasinc, B. RuščićRequires cookie*
 Title    Photoelectron Spectroscopy of Heterocycles. Indene Analogs  
 Abstract    The He (I) photoelectron (PE) spectra of indene, indole, benzofuran, benzothiophene, 1-, 2-, 3-, 4-and 6-methylindole and 4,5,6,7-tetrafluoroindole were measured and analysed. A close correlation between the jr-ionisation energies of these compounds and the eigenvalues of the corresponding HMO-orbitals is found. A qualitative scheme for the assignment of the ^-electron ionisations by orbital interaction of the constituents of the indene analogs i. e. of styrene and the p-orbital of the corresponding heteroatom, indicates that the energy levels in all the compounds investigated can be described by the same type of interaction and yields a value for the inductive effect of the hetero group (-CHS and >CH2: 0.3 eV, >NH: 0.4, >S: 0.1, >0: negligible). 
  Reference    (Z. Naturforsch. 31a, 1051—1056 [1976]; received July 14 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1051.pdf 
 Identifier    ZNA-1976-31a-1051 
 Volume    31 
188Author    K. Dräger, U. WolfmeierRequires cookie*
 Title    Die erlaubten und verbotenen Resonanzübergänge der Mn 2+ -Ionen in Ce0 2  
 Abstract    The absorption behaviour of Mn 2+ -ions in Ce02 has been investigated and interpreted for the first time. Beside the hyperfine-multiplett with selection rules AM = \ and Am = 0 we observed forbidden transitions with AM = 1 and Am=+\. At T — 29Q K the line width is rather small and amounts to 2.5 G. The entire spectrum can be described by an isotropic spin-Hamilton operator with #=1.9989 and v4 = 86.36-10~ 4 cm -1 . It is shown for Mn 2+ in the crystal-field of oxygen-ions that there is a linear relationship between the hyperfine coupling constant A and the coordination number. 
  Reference    (Z. Naturforsch. 31a, 1057—1061 [1976]; eingegangen am 24. Juli 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1057.pdf 
 Identifier    ZNA-1976-31a-1057 
 Volume    31 
189Author    W. Nitsch, H. J. Falge, R. ClausRequires cookie*
 Title    Observation of Local Mode Polaritons by Frustrated Total Reflection  
 Abstract    It is shown that local modes due to C 13 -and N 15 -Isotopes in their natural abundances of 1.12% and 0.36% in K3Cu(CN)4 can be observed by the frustrated total reflection technique (FTR) in spite of almost vanishing mode strengths. The observation is made possible by the dispersion of the polariton brandies which reduces the reflectivity in the resonance region. 
  Reference    (Z. Naturforsch. 31a, 1062—1064 [1976]; received July 10 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1062.pdf 
 Identifier    ZNA-1976-31a-1062 
 Volume    31 
190Author    K. Hinsch, G. MarowskyRequires cookie*
 Title      
 Abstract    A novel method is described for compensation of size variations in the input pattern of an opti-cal correlator for pattern recognition by appropriate adjustment of the reconstruction wavelength. Simple ring-shaped patterns of variable diameter have been optically cross-correlated. Using a tunable dye laser of narrow bandwidth, the correlator output was analyzed for various combinations of size and wavelength to show the performance of the method. 
  Reference    (Z. Naturforsch. 31a, 1065—1067 [1976]; received June 16 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1065.pdf 
 Identifier    ZNA-1976-31a-1065 
 Volume    31 
191Author    L. Schäfer, A. KlemmRequires cookie*
 Title    Der Druck bei molekular-dynamischen Simulationen von Ionenflüssigkeiten  
 Abstract    Precise molecular dynamics calculations on molten potassium chloride have been performed using Born-Mayer-Huggins pair potentials and periodic boxes containing 216 ions. It is found that the function (2 E k —y)/3V, Ek being the kinetic energy, the instantaneous virial and V the volume, respectively, which on averaging yields the pressure, fluctuates by ± 2000 bar due to the fluctuations of the exponential term of yj. To base the calculated pressure and velocity auto-correlation functions on good statistics, it seems necessary to reduce these fluctuations by increasing the periodic boxes. 
  Reference    (Z. Naturforsch. 31a, 1068—1072 [1976]; eingegangen am 22. Juni 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1068.pdf 
 Identifier    ZNA-1976-31a-1068 
 Volume    31 
192Author    K. HeinzingerRequires cookie*
 Title    A Molecular Dynamics Study of Aqueous Solutions V. Angular Distribution of the Water Dipoles in the Hydration Shells of Various Alkali-and Halide Ions  
 Abstract    The angular distributions of the water dipoles have been calculated from molecular dynamics runs for the first hydration shells of various ions in 2.2 molal LiJ, LiCl, NaCl, CsCl and CsF solutions and in a 0.55 molal NaCl solution. It is shown how the distributions depend on the size of the shell taken around each ion. The results give no indication for the existence of desoriented water molecules in the immediate neighbourhood of the ions. 
  Reference    (Z. Naturforsch. 31a, 1073—1076 [1976]; received July 30 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1073.pdf 
 Identifier    ZNA-1976-31a-1073 
 Volume    31 
193Author    Alberto Schiraldi, Elisabetta PezzatiRequires cookie*
 Title    Thermoelectric Power of the Systems AgI-Ag 2 X0 4 (X=Mo, W)  
 Abstract    Determinations of the initial thermoelectric power were carried out at 1000 K in the whole composition range of the molten systems Agl—Ag2X04 (X = Mo, W). For the composition = 0.8 the investigation was extended to the variation of the thermal emf at the "melting point" of the electrochemically noteworthy glass-like phases, obtained through rapid quenching of the melt. The hypothesis that these glass-like materials could keep the melt configuration at room temperature is contradicted by the results on the molten systems; more complex interpretations, based on the behaviour of the thermal emf at the "m.p." are proposed. 
  Reference    (Z. Naturforsch. 31a, 1077—1080 [1976]; received May 14 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1077.pdf 
 Identifier    ZNA-1976-31a-1077 
 Volume    31 
194Author    BerndM. RodeRequires cookie*
 Title    A Theoretical Study on Negative Solvation by Means of Quantum Chemical Calculations on the I(H 2 0)-Complex  
 Abstract    By means of an "ab initio" all electron treatment of the I"/H20 complex in various geometrical arrangements, it has been attempted to derive some arguments for the general discussion about the phenomenon of negative solvation, based on the background of quantum chemistry. The most stable conformation of the complex is indicated to have C2v symmetry. Rotating of this conformation by 180° leads to an arrangement whose destabilization energy has about the same value as the com-plex formation energy, which, on the other hand, is only slightly higher than the hydrogen bond energy between two water molecules. These results contradict the formation of an almost rigid first hydration sphere and allow, further, the interpretation of the negative solvation by means of a "cooperative effect" between ion-solvent complex and other solvent molecules, in full agreement with the work of Engel and Hertz. 
  Reference    (Z. Naturforsch. 31a, 1081—1084 [1976]; received July 2 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1081.pdf 
 Identifier    ZNA-1976-31a-1081 
 Volume    31 
195Author    P. U. Sakellaridis, E. K. KarageorgopoulosRequires cookie*
 Title    Dielectric Behaviour in the MHz range of cis-bis (glycynato)Cu(II) monohydrate and (glycylglycinato)Cu(II) trihydrate in Water  
 Abstract    The dielectric properties of Cu(gly)2 and Cu(glygly) in diluted aqueous solution were examined in the MHz range at 273 to 313 K. The complexes exhibit dielectric absorption in the ranges 5.09X10 7 to 9.34X10 7 Hz and 4.63X10 7 to 8.01X10 7 Hz, respectively, depending on concentration and temperature. This absorption was attributed to rotational relaxation of the unhydrated and monohydrated complexes. The following data for the two complexes in solution at 293 K have been obtained, respectively: dipole moment 19.3 D and 34.0 D, charge separation 2.01 A and 3.54 A, relaxation time 2.3X10 -9 sec and 2.6X10 -9 sec, molecular radius 6.36 A and 6.47 A, activation energy for the relaxation process 5.6 kcal mole -1 for both complexes. 
  Reference    (Z. Naturforsch. 31a, 1085—1088 [1976]; received April 5 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1085.pdf 
 Identifier    ZNA-1976-31a-1085 
 Volume    31 
196Author    J. Grossmann, D. Müller, J. Petersson, E. SchneiderRequires cookie*
 Title    Dynamical Dielectric Instability of the Ferroelectric AgNa(N0 2 ) 2  
 Abstract    The characteristic ferroelectric dispersion of the complex dielectric constant of AgNa(N02)2 is measured in a wide temperature range enclosing the transition point. It can be well described by a Debye monodispersive process except for a small temperature intervall around T c . The relaxation strength obeys a Curie-Weiss law in the paraelectric phase, whereas in the ferroelectric phase there are deviations from this behaviour. A first order phase transition is observed which is close to a second order one. The maximum value of the dielectric constant at T c is 10 4 . 
  Reference    (Z. Naturforsch. 31a, 1089—1093 [1976]; received July 3 1976) 
  Published    1976 
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 Identifier    ZNA-1976-31a-1089 
 Volume    31 
197Author    J. Mahanty, C.N R RaoRequires cookie*
 Title    Theory of Dispersion Energy and Solvent Effects on Molecular Spectra  
 Abstract    The theory of dispersion energy has been shown to directly give an explicit expression for the solvent shifts in the spectra of non-polar solute molecules. 
  Reference    (Z. Naturforsch. 31a, 1094—1097 [1976]; received March 1 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1094.pdf 
 Identifier    ZNA-1976-31a-1094 
 Volume    31 
198Author    U. P. Fringeli, M. Schadt, P. Riĥak, HsH. GünthardRequires cookie*
 Title    Hydrocarbon Chain Ordering in Liquid Crystals Investigated by Means of Infrared Attenuated Total Reflection (IR-ATR) Spectroscopy  
 Abstract    Stationary and modulated IR-ATR spectra of Schiff's base nematic liquid crystals are reported. The mean order parameter of both, the aromatic core and the hydrocarbon chains is determined by analysis of the infrared dichroism of characteristic absorption bands. Hydrocarbon chain ordering was found to be considerably lower than predicted by Marcelja's statistical theory. 
  Reference    (Z. Naturforsch. 31a, 1098—1107 [1976]; received July 8 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1098.pdf 
 Identifier    ZNA-1976-31a-1098 
 Volume    31 
199Author    S. RomanoRequires cookie*
 Title    Monte-Carlo Simulation of Nitrogen  
 Abstract    The subject of the present paper is computer simulation of a-solid and liquid nitrogen, using a Lennard-Jones atom-atom potential and the isothermal-isobaric Monte-Carlo method. Two sets of calculations were performed, both at the same pressure (1 atm) and temperatures (a-solid at 25 and 35.6 K, liquid at 63.15 and 77.35 K). In the first set the molecules are assumed to be rigid, whereas in the second they are allowed to vibrate; the molecular vibration is treated classically and as-sumed to be harmonic. Comparison are mode between the two models and with experiment. 
  Reference    (Z. Naturforsch. 31a, 1108—1112 [1976]; received July 3 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1108.pdf 
 Identifier    ZNA-1976-31a-1108 
 Volume    31 
200Author    WilliamH. HockingRequires cookie*
 Title    The Other Rotamer of Formic Acid, «VHCOOH  
 Abstract    The rotational spectrum of the planar eis rotamer of formic acid, cis-HCOOH, has been detected for the first time. Twenty transitions belonging to the IRK , "JQi, QQ2 > r Po» r Pi r P2 brandies of the parent isotopic species in its ground state have been assigned and measured. The rotational constants and quartic centrifugal distortion constants have been determined using Watson's reduced Hamiltonian. Stark effect measurements have yielded the molecular electric dipole moment: /na= 2.65(1) D, ^6 = 2.71(1) D and ,« = 3.79(1) D. The energy difference between the ground vibrational states of eis-and iraras-HCOOH has been determined by microwave relative intensity measurements. The eis rotamer is found to lie at higher energy than the trans rotamer by 1365 + 30 cm -1 . A one dimensional potential energy curve has been calculated for the OH torsional vibration of formic acid. 
  Reference    (Z. Naturforsch. 31a, 1113—1121 [1976]; received July 10 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1113.pdf 
 Identifier    ZNA-1976-31a-1113 
 Volume    31 
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