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Facet   Publication Year 1983  [X]
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1983[X]
61Author    F. R. KruegerRequires cookie*
 Title    Thermodynamics of Ion Formation by Fast Dissipation of Energy at Solid Surfaces  
 Abstract    A fast dissipation of a certain amount of energy at a solid surface by a mechanism whatsoever may cause a non-equilibrium phase transition of the surface material forming nearly instantane-ously a relatively large amount of gaseous molecular and atomic ions. This is known to be a phenomenon common to many techniques utilized to create ions especially from organic solids. The thermodymanics of these processes are deduced from first principles; physical properties (kinetic energy and angular distributions, excitation energy) and chemical properties (ion types, mass spectra and intensities) are derived. Like "temperature" as an intensive quantity plays a major role in equilibrium thermodynamics, "action" as an extensive quantity takes the counter-part in this very far-from-equilibrium behaviour. 
  Reference    Z. Naturforsch. 38a, 385—394 (1983); received November 15 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0385.pdf 
 Identifier    ZNA-1983-38a-0385 
 Volume    38 
62Author    W. Knoll, P. Lamparter, S. SteebRequires cookie*
 Title    Structure of Molten Bi-Zn-AIloys by Means of Neutron Diffraction  
 Abstract    Neutron diffraction experiments were performed with five molten Bi-Zn-alloys and the two molten elements Bi and Zn. The total structure factors and the pair correlation functions are given. The concentration dependence of the experimental nearest neighbour distances and the experimental coordination numbers is in accordance with the segregation behaviour prevailing in these melts. 
  Reference    Z. Naturforsch. 38a, 395—398 (1983); received December 15 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0395.pdf 
 Identifier    ZNA-1983-38a-0395 
 Volume    38 
63Author    Fumio HigashinoRequires cookie*
 Title    Characteristic Method Applied to Blast Waves in a Dusty Gas  
 Abstract    The unsteady propagation of shock waves in a dusty gas is investigated theoretically. The characteristic equations are obtained without neglecting the effect of the partial pressure of the particles. Numerical computations were carried out by Hartree's technique. As examples, the flow in a shock tube and in a blast wave is examined by applying a generalized piston problem. The results show that the existence of suspended particles may cause a rapid decay of the shock strength and that the flow field is devided into several regimes which are characterized by the shock position and the relaxation times. 
  Reference    Z. Naturforsch. 38a, 399—406 (1983); received November 6 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0399.pdf 
 Identifier    ZNA-1983-38a-0399 
 Volume    38 
64Author    PaulR. GerberRequires cookie*
 Title    On the Cholesteric-Nematic Phase-Change Transition in Layers with Homeotropically Orienting Surfaces  
 Abstract    Lattice-model calculations of the energies of surface director-configurations are presented. These configurations mediate between the homeotropic surface conditions and the bulk fingerprint texture of cholesteric layers. Their energy determines the asymptotic behaviour of the cholesteric-nematic threshold field in the limit of thick layers. The dependence of their energies on the elastic constant ratios could be brought into a simple scaling form. This form is in agreement with existing and newly presented measurements. 
  Reference    Z. Naturforsch. 38a, 407—414 (1983); received November 8 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0407.pdf 
 Identifier    ZNA-1983-38a-0407 
 Volume    38 
65Author    MichaelH. Palmerand, Isobel SimpsonRequires cookie*
 Title      
 Abstract    Ab initio studies of the spin density in mono-and bicyclic N hetero-aromatic compounds, and naphthalene are reported. The wave functions were constructed from both minimal and double zeta bases in all cases, and both RHF and UHF formalisms were used together with quartet annihilation. The statistical variations in correlations between spin population density and hyperfine coupling are investigated. After annihilation the MB and DZ wave functions become relatively similar, but do lead to some differences in assignment for the smaller values of Ö h . In general the agreement between and calculated density is improved by two term rather than one term expressions, but there are still a number of experimental hyperfine couplings awaited. 
  Reference    Z. Naturforsch. 38a, 415—427 (1983); received December 22 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0415.pdf 
 Identifier    ZNA-1983-38a-0415 
 Volume    38 
66Author    M. Tabata, A. LundRequires cookie*
 Title    ESR of Cation Radicals of Methyl-substituted Benzenes in a CF3CCI3 Matrix  
 Abstract    A new matrix, 1,1,1-trifluorotrichloroethane, CF3CCI3, has been employed in radiation chemistry studies to stabilise positive ions. As a test, positive ions of benzene, toluene, orto-, meta-and paraxylene and biphenyl have been generated by y-irradiation of the solutes contained in the CF3CCI3 matrix at 77 K. The ions have been investigated by ESR, and hyperfine couplings have been obtained. The data complement and correct the splitting values obtained previously in the adsorbed state. 
  Reference    Z. Naturforsch. 38a, 428—433 (1983); received December 28 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0428.pdf 
 Identifier    ZNA-1983-38a-0428 
 Volume    38 
67Author    St Limmer, M. FindeisenRequires cookie*
 Title    Proton NMR Investigations of the Smectic-C Phases of Three Alkyloxy-Azoxybenzenes  
 Abstract    Proton NMR investigations of the smectic-C phases of three 4,4'-bis-/?-alkyloxy-azoxybenzenes (C 7 , C 8 , C 9) with temperature independent tilt angles are presented. The behaviour of well-aligned samples (strong magnetic field ^ 1.5 T, slow cooling rate) under rotation in the field can be described by the models of Luz and Meiboom, and Wise, Smith, and Doane, (LM/WSD), resp. However, on polarization of the samples in presence of magnetic fields ^ 0.75 T the molecular directors are not arranged preferentially parallel to the direction of the polarizing magnetic field but are rather inclined, i.e., the layers are stacked preferentially perpendicular to the original magnetic field direction (PSL model). It is shown that all the angular dependences of NMR second moments can be interpreted in terms of a superposition of the LM/WSD and PSL models, or, on the other hand, by assuming totally disordered fractions of the samples together with portions that fully obey the behaviour demanded by one of the above models (LM/WSD or PSL). The tilt angles derived from the comparison of experimental and theoretical angular dependences of the second moments for well-aligned samples are applied to the explanation of the experiments at lower polarizing fields successfully, too. 
  Reference    Z. Naturforsch. 38a, 434—446 (1983); received October 4 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0434.pdf 
 Identifier    ZNA-1983-38a-0434 
 Volume    38 
68Author    J. Demaison, D. Boucher, J. Burie, A. DubrulleRequires cookie*
 Title    Millimeter-Wave Spectrum of Ethyl Acetylene Centrifugal Distortion, Coriolis Interaction and Internal Rotation  
 Abstract    The rotational spectrum of ethyl acetylene has been investigated between 70 and 320 GHz. A Coriolis interaction has been found between the first excited state of the methyl torsion and the C-C = C in plane deformation. Splittings of transitions in the first excited torsional state show that the barrier hindering internal rotation of the methyl group amounts to 3271 cal/mole. 
  Reference    Z. Naturforsch. 38a, 447—451 (1983); received December 29 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0447.pdf 
 Identifier    ZNA-1983-38a-0447 
 Volume    38 
69Author    G. Bestmann, H. DreizlerRequires cookie*
 Title    Pulsed Microwave Microwave Double Resonance Spectroscopy with Fourier Transform Technique  
 Abstract    We present a new three and four level double resonance spectroscopy in the microwave region. A pulsed pump radiation and Fourier transform technique for detection of the signal radiation is used. This method is complementary to that using continuous microwave pump radiation. 
  Reference    Z. Naturforsch. 38a, 452—458 (1983); received January 8 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0452.pdf 
 Identifier    ZNA-1983-38a-0452 
 Volume    38 
70Author    W. Baden, Alarich WeissRequires cookie*
 Title    Measurement of ! H Knight Shift and Magnetic Susceptibility in Compressed Powder Samples of TaH 0 6 i  
 Abstract    Measurements of the Knight shift and the magnetic susceptibility of TaH 0 61 on thin foils, prepared from TaH 06 | powder at high pressure, are reported. It is shown that the method leads to useful results and is applicable to brittle materials for which compact samples are not available. Both, A'H and / v , are given for the hydrides TaH v in the range O^.tS 0.74. 
  Reference    Z. Naturforsch. 38a, 459—462 (1983); received December 24 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0459.pdf 
 Identifier    ZNA-1983-38a-0459 
 Volume    38 
71Author    T. Krüger, H. PreußRequires cookie*
 Title    Investigation of Some Sulphur Halides — An Application of the Pseudopotential Method  
 Abstract    Semilocal pseudopotentials are used in combination with a density-functional approximation for the correlation energy and special optimized basis sets to investigate the sulphur halides SF, SF 2 , SF 3 , FSSF, SSF 2 , SCI, SC1 2 , C1SSC1 and SSC1 2 . It turns out that the inclusion of d-orbitals in the basis set playes a significant role with respect to the quality of the calculated molecular parameters. Properties of SF 3 are calculated for the first time, and the differences between the disulphur difluorides and the disulphur dichlorides are explained. 
  Reference    Z. Naturforsch. 38a, 463—472 (1983); received December 1 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0463.pdf 
 Identifier    ZNA-1983-38a-0463 
 Volume    38 
72Author    AlejandroM. Mesón, FranciscoM. Fernández, EduardoA. CastroRequires cookie*
 Title    Dirichlet and von Neumann Basis Set for Quantum Mechanical Anharmonic Oscillators  
 Abstract    It is shown that accurate upper and lower bounds to the eigenvalues of anharmonic oscillators can be obtained by means of the Rayleigh-Ritz variational method and two trigonometric basis sets of functions which satisfy Dirichlet and Von Neumann boundary conditions. Numerical results show that the Dirichlet basis set is more appropriate than the harmonic oscillator one for calculating eigenvalues and the value of eigenfunctions at the origin. 
  Reference    Z. Naturforsch. 38a, 473—476 (1983); received November 18 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0473.pdf 
 Identifier    ZNA-1983-38a-0473 
 Volume    38 
73Author    Hiroyuki ItohRequires cookie*
 Title    Molecular Orbital Study on the Interaction of Ni and Cu Atoms with Oxygen-Containing Organic Ligands and Its Implication to Adsorption  
 Abstract    The interactions of Ni and Cu atoms with CH 3 OH and H 2 CO ligands were studied by means of ab initio MO calculations. The metal atom-ligand bond length is shorter for Ni than for Cu. Correspondingly, the binding energy is larger for Ni than for Cu. The difference in adsorptive properties of Ni and Cu is explained by the difference in their electronic structures. Alloying effects are discussed. The interaction of the Cu atom with the CH 3 0 radical is also calculated. 
  Reference    Z. Naturforsch. 38a, 477—482 (1983); received December 21 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0477.pdf 
 Identifier    ZNA-1983-38a-0477 
 Volume    38 
74Author    H. D. Försterling, H. J. Lamberz, H. SchreiberRequires cookie*
 Title    Formation of Br(>2 in the Belousov-Zhabotinsky-System Reaction of Aliphatic Alcohols with Bromate  
 Abstract    Br0 2 was found as an intermediate in the reaction of bromate with alcohols (e.g. methanol, isopropanol, allylalcohol) or ketones (e.g. acetone). This reaction may be important for the understanding of bromate driven oscillators. 
  Reference    Z. Naturforsch. 38a, 483—486 (1983); received December 24 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0483.pdf 
 Identifier    ZNA-1983-38a-0483 
 Volume    38 
75Author    R. Janssen, V. Hlavacek, P. Van RompayRequires cookie*
 Title    Bifurcation Pattern in Reaction-Diffusion Dissipative Systems  
 Abstract    A detailed bifurcation analysis of the reaction-diffusion equations representing the trimolec-ular model of Prigogine and Lefever f'Brusselator") is performed. The model considers also the diffusion of the initial component. The homogeneous solution to the problem cannot exist and the bifurcation analysis must be performed numerically. There are two ways of possible branching, either the basic branch will be followed or branching from an isolated branch may occur. In both cases, the branching is of the type symmetric -* asymmetric -» symmetric, etc. For higher dimension of the system a topologically interesting isolated branch of asymmetric solu-tions was discovered. 
  Reference    Z. Naturforsch. 38a, 487—492 (1983); received December 3 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0487.pdf 
 Identifier    ZNA-1983-38a-0487 
 Volume    38 
76Author    HeinzK H SiedentopRequires cookie*
 Title    Localization of Eigenvalues by a Modification of MUller's Variational Principle in Some Exactly Solvable Cases  
 Abstract    Upper and lower bounds on the eigenvalues of Schrödinger operators with simple one and a simple three dimensional potential (well of finite depth, spherical ^-potential) are given by means of a modification of Müller's variational principle. The estimates, comparing them with the exact eigenvalues, show a localization of the eigenvalues even in a rough approximation for the trial operator. 
  Reference    Z. Naturforsch. 38a, 493—496 (1983); received November 15 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0493.pdf 
 Identifier    ZNA-1983-38a-0493 
 Volume    38 
77Author    K. S. Krausz, Krausz, D. NecsulescuRequires cookie*
 Title     
 Abstract    It is shown that the physical mechanism of thermally activated subcritical crack growth is always a stochastic process and leads, therefore, to probabilistic crack propagation. This process is the result of the random breaking of atomic bonds and has to be clearly distinguished from the well known Weibull distribution. A Markov chain analysis leads to the normal distribution of crack sizes. The results demonstrate that conventional deterministic finite life-time designs are unsatisfactory and can lead to early failure of machine or structure elements as the consequence of the probabilistic process of crack propagation. The conclusions lead to the reliability analysis of Part II. 
  Reference    Z. Naturforsch. 38a, 497—502 (1983); received January 10 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0497.pdf 
 Identifier    ZNA-1983-38a-0497 
 Volume    38 
78Author    V.R B Jani, GohelRequires cookie*
 Title     
 Abstract    Debye-Waller factors at different temperatures of four alkali and three noble metals have been computed on the basis of a screened shell phenomenological model. The theoretical values are compared with existing experimental data. Particularly for lithium and potassium, most recent experimental information has been included. A critical examination of the results reveals a satis-factory agreement between the theoretical and experimental findings. 
  Reference    Z. Naturforsch. 38a, 503—508 (1983); received February 1 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0503.pdf 
 Identifier    ZNA-1983-38a-0503 
 Volume    38 
79Author    Y. WasedaRequires cookie*
 Title    The Structure Factors of Liquid Metals in Low O Region  
 Abstract    The low Q structure factors have been determined in the region down to Q = 0.08 A" 1 for liquid Na, K, Rb, Cs, Mg, Ca, Sr, Ba, Al and In at several temperatures by x-ray diffraction with the transmission mode. The low Q structure factor is a slowly increasing function of Q, and its profile is quite similar among the liquid metals presently investigated. The long wavelength limit value of S(Q) derived from the present experimental structural data agrees well with that calculated from the isothermal compressibility for seven metals near the melting point. A differ-ence larger than 10% was found in the cases of liquid Cs, Ca and Al. 
  Reference    Z. Naturforsch. 38a, 509—515 (1983); received November 26 1982 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0509.pdf 
 Identifier    ZNA-1983-38a-0509 
 Volume    38 
80Author    A. KlemmRequires cookie*
 Title    An Incomplete-Dissociation Model for Diffusion and Ionic Conduction in Pure Molten Salts  
 Abstract    Diffusion and ionic conduction in pure 1:1 molten salts is described by an incomplete-disso-ciation model comprising neutral diatomic molecules and monoatomic ions. The internal mobility b + _ and the self-diffusion coefficients D + and D_ are given in terms of the six inter-particle friction coefficients and the degree of dissociation. By an approximation it is possible to derive from experimental b + _, Z) + and ZL values an apparent degree of dissociation which ranges from 0.93 for NaCl to 0.51 for T1C1 and decreases with temperature. 
  Reference    Z. Naturforsch. 38a, 516—519 (1983); received February 11 1983 
  Published    1983 
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 TEI-XML for    default:Reihe_A/38/ZNA-1983-38a-0516.pdf 
 Identifier    ZNA-1983-38a-0516 
 Volume    38 
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