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1976 (300)
161Author    J. Zienert, K. Güttner, G. MünzenbergRequires cookie*
 Title    Monte-Carlo-Rechnungen und Messungen zur Vielfachstreuung von schweren Ionen in dünnen Folien Monte Carlo Calculations and Measurements Concerning the Multiple Scattering of Heavy Ions in Thin Films  
 Abstract    The behaviour of energetic heavy ions in thin films is simulated by means of a Monte Carlo method taking especially into account the energy loss of the scattered particles. Based on a variably matched screened Coulomb potential the calculations yield the angular and energy distri-butions of the transmitted ions. The results show a good agreement with the theory of Meyer. Furthermore for keV He ions scattering distributions have been measured in C, Al and Ag, which agree fairly well with the computations, if a suitable fit of the screening parameter is used in the Monte Carlo simulations. 
  Reference    (Z. Naturforsch. 31a, 949—955 [1976]; eingegangen am 22. Mai 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0949.pdf 
 Identifier    ZNA-1976-31a-0949 
 Volume    31 
162Author    Ernest Karawacki, SilasE. GustafssonRequires cookie*
 Title    Refractive Index Measurements on Fused LiNO s , RbNO s and CsNOg with a Modified Thermooptic Technique  
 Abstract    A modified method for measuring absolute values of the refractive index and its temperature dependence is presented. A direct comparison is made between the refractive index of a liquid sample and ambient air. Values for LiNO s , RbNO s , and CsN0 3 within a temperature interval of about 80 K above the melting point for several different wavelengths are presented as well as the calculated values of the molar refractivity and the absorption lines of the N0 3 ~ ion. 
  Reference    (Z. Naturforsch. 31a, 956—959 [1976]; received May 24 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0956.pdf 
 Identifier    ZNA-1976-31a-0956 
 Volume    31 
163Author    J. BlétryRequires cookie*
 Title    Partial Structure Factors in Multicomponent Liquid or Amorphous Alloys  
 Abstract    The structure of a f component liquid or amorphous alloy is analyzed in terms of v(v-\-\)j2 independent partial structure factors which are associated to the different correlations between the numbers of particles of all chemical species. This formalism, which is specially adapted to the study of alloys of more than two components, is related to Fournet-Faber-Ziman and extended Bhatia-Thornton theory. Sum rules, inequality relations and limiting values are calculated in the static approximation and Debye pair expressions of the structure factors are derived in the isotropic approximation. 
  Reference    (Z. Naturforsch. 31a, 960—966 [1976]; received May 15 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0960.pdf 
 Identifier    ZNA-1976-31a-0960 
 Volume    31 
164Author    J. J. Van LoefRequires cookie*
 Title    Hard-sphere Results from Experimental Transport Behaviour of Molten Salts and Structural Properties  
 Abstract    A single component hard sphere description molten halides and nitrates, applied to self-diffusion and viscosity data, has led to a hard sphere size which for a given cation depends linearly upon the anionic radius. This correlation has been used to predict viscosity coefficients of fused alkali fluorides and to estimate the effective size of the N0 3 ~-anion in molten nitrates. The Stokes-Einstein relationship between r) and D is satisfied, where D= (D + +Z>~)/2, and this relationship in combina-tion with the observed linear dependence of Tl/r] and DjTl on the molar volume can in principle be used as a criterion for data selection. 
  Reference    (Z. Naturforsch. 31a, 967—973 [1976]; received March 4 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0967.pdf 
 Identifier    ZNA-1976-31a-0967 
 Volume    31 
165Author    Aldo Magistris, Gaetano Chiodelli, GiuseppinaVigano CampariRequires cookie*
 Title    Stable and Metastable Phases in the Systems AgI-Ag 2 X0 4 (X=Cr, Mo, W)  
 Abstract    DTA and powder x-ray diffraction measurements allowed to draw the phase diagrams of the systems AgI-Ag 2 X0 4 (X = Cr, Mo, W). A more detailed investigation was devoted to the composition range around ZAgI = 0.8, where in preliminary tests it was observed that the room temperature ionic conductivity strongly depends on the thermal treatment of the sample. By quenching mixtures at -XAgI = 0.8, glass-like phases with high conductivity were obtained; in the systems Agl—Ag 2 Cr0 4 and Agl—Ag 2 Mo 4 the subsequent crystallization gave rise to non con-ducting phases, whereas the occurrence of the highly conducting compound 4AgI-Ag 2 W0 4 was recognized in the third system investigated. 
  Reference    (Z. Naturforsch. 31a, 974—977 [1976]; received May 14 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0974.pdf 
 Identifier    ZNA-1976-31a-0974 
 Volume    31 
166Author    0. Lutz, W. Nepple, A. NolleRequires cookie*
 Title    0 and 33 S Fourier Transform NMR Studies in Thiosulfate and Thiomolybdate Solutions  
 Abstract    Fourier Transform NMR measurements of 17 0 and 33 S are reported for several aqueous sulfate, thiosulfate, molybdate and thinftnolybdate solutions. Using informations from 17 0 signals, 33 S NMR lines are assigned. Experimental parameters, chemical shifts and linewidths are given. 
  Reference    (Z. Naturforsch. 31a, 978—980 [1976]; received May 26 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0978.pdf 
 Identifier    ZNA-1976-31a-0978 
 Volume    31 
167Author    F. Willig, G. SchererRequires cookie*
 Title    The Influence of Recombination between Holes and Reduced Redox Ions on the Efficiency of Hole Injection from Electrolytic Contacts into Organic Insulator Crystals  
 Abstract    The efficiency of hole injection from electrolytic contacts into organic insulator crystals is con-trolled by hole generation and hole destruction at the crystal surface through oxidized and reduced redox ions respectively and by hole escape into the crystal bulk which competes with hole destruc-tion. By increasing the concentration of reduced redox ions from virtually zero in a suitable system the transition has been studied from the one extreme case where all the generated holes contribute to the injection current to the other extreme case where the majority of the generated holes recombines with reduced redox ions before they can escape into the crystal bulk. From the experiments one can deduce that the generated hole spends less than IO -10 s within the reaction distance of its reduced parent redox ion, at external field strengths 10 4 V/cm, but returns to the crystal surface during a much longer time, e.g. during about 10~ 8 s at an external field strength of 10 5 V/cm, before it can escape finally into the crystal bulk. 
  Reference    (Z. Naturforsch. 31a, 981—986 [1976]; received May 24 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0981.pdf 
 Identifier    ZNA-1976-31a-0981 
 Volume    31 
168Author    F. Fratev, 0. E. Polansky, M. ZanderRequires cookie*
 Title    Photochemisches Verhalten und spektroskopische Eigenschaften von Anilino-naphthalinen  
 Abstract    From the fluorescence and phosphorescence spectra of several aromatic amines it is concluded that the conjugation between nitrogen and aryl groups in the excited state is restricted. With this result a sterical explanation for the lack of the expected photochemical carbazole ring closure of 1-and 2-anilino naphthalene is given. 
  Reference    (Z. Naturforsch. 31a, 987—989 [1976]; eingegangen am 11. Juni 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0987.pdf 
 Identifier    ZNA-1976-31a-0987 
 Volume    31 
169Author    Günther HeidtRequires cookie*
 Title    Einfluß der Deuterierung auf die Excimerenkinetik des Pyrens  
 Abstract    The effect of deuteration on all six photophysical and kinetic constants of pyrene excimer formation is investigated. The rate constants of monomer and excimer emission and the rate of dis-sociation of the excimer are not affected by deuteration. The increase of the radiationless deactiva-tion of the monomer (anomalous effect) agrees with the theoretical expectation. The radiationless deactivation of the excimer at various temperatures shows no effect and therefore does not take place via the excimer triplet. The decrease of the excimer formation rate can be explained by the effect of deuteration on the partition function and hence on the entropy. 
  Reference    (Z. Naturforsch. 31a, 990—994 [1976]; eingegangen am 13. Mai 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0990.pdf 
 Identifier    ZNA-1976-31a-0990 
 Volume    31 
170Author    WilliamH. Hocking, Gisbert WinnewisserRequires cookie*
 Title    The Rotational Spectrum of Monothioformic Acid. III. Dipole Moment and Relative Intensity Measurements 1 ' 2  
 Abstract    The molecular electric dipole moment of each of the two planar thiol rotamers of monothio-formic acid, in its ground state, has been determined from Stark effect measurements. The results are for c£s-HC(:0)SH: ^0=1-805(1) D, ^0 = 2.228(1) D and w=2.868(l) D; whereas for trans-HC(:0)SH: ^0 = 1-366(1) D, ^ = 0.702(1) D and ^ = 1.536(1) D. Additional Stark effect measurements on HC(:0)SD and DC(:0)SH have yielded the direction of the dipole moment in each rotamer. The energy difference between the ground vibrational states of eis-and trans-HC(:0)SH has also been determined by relative intensity measurements. The eis rotamer is found to lie at higher energy than the trans rotamerb y 2767(7) J-mol -1 (231.3(6) cm -1 or 661.3(17) cal-mol — 
  Reference    (Z. Naturforsch. 31a, 995—1001 [1976]; received June 14 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0995.pdf 
 Identifier    ZNA-1976-31a-0995 
 Volume    31 
171Author    J. Marquard, F. Aurich, K. D. SchumacherRequires cookie*
 Title    Analyse der Fluoreszenz von C 6 D 6 -Mischkristallen durch IR-Modulation  
 Abstract    Analysis of the Fluorescence of C 6 D 6 Isotopic Mixed Crystals by 1R Modulation Deuterated benzene mixed crystals are irradiated by intensity modulated i.r. at low tempera-tures. The i.r. causes a modulation of crystal temperature which in turn causes a modulation of fluorescence intensity of the crystal. Phase sensitive detection of fluorescence allows the assignment of bands to different trap emissions due to their different temperature dependences. A simple kinetic model gives qualitative agreement with experiments. 
  Reference    (Z. Naturforsch. 31a, 1002—1006 [1976]; eingegangen am 19. Juni 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1002.pdf 
 Identifier    ZNA-1976-31a-1002 
 Volume    31 
172Author    N. Annapurna, G. RamanaiahRequires cookie*
 Title    An Inertial Contribution to the Steady State Film Profiles of Viscous Drainage  
 Abstract    The effect of inertial terms in the Navier-Stokes equation of viscous drainage on a flat plate is investigated. It is found that they give rise to a constant correction term to the Jeffreys' parabola which persists in the steady state. Equation (1) can be solved by a separation of variables, and the solution takes the form 
  Reference    (Z. Naturforsch. 31a, 1007—1008 [1976]; received April 14 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1007_n.pdf 
 Identifier    ZNA-1976-31a-1007_n 
 Volume    31 
173Author    T. R. Ananthakrishnan, C. P. Girijavallabhan, K.Babu JosephRequires cookie*
 Title    Mass Dependence of the Vibrational Eigenvector Matrix Elements in XY 2 (Gjv) Type Molecules  
 Abstract    Interesting linear relationships (one for hydrides and another for nonhydrides) are found to exist between a cer-tain parameter c characterising the vibrational eigenvector matrix L and the mass ratio my/mx in the case of bent sym-metric XY2 type molecules with small mass coupling. 
  Reference    (Z. Naturforsch. 31a, 1009—1010 [1976]; received April 12 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1009_n.pdf 
 Identifier    ZNA-1976-31a-1009_n 
 Volume    31 
174Author    R. C. SharmaRequires cookie*
 Title    Thermal Instability of a Compressible Hall Plasma  
 Abstract    The thermal instability of a Hall plasma taking compres-sibility into account is studied. The effect of compressibility is found to be stabilizing while the Hall currents have a destabilizing effect. The system is stable for (c p /g)ß < C. 1. Oscillatory modes are introduced due to the presence of a magnetic field which are missing in the absence of a magne-tic field (and hence in the absence of Hall currents) for (c p /g)ß~> 1. The case of overstability is also discussed. 
  Reference    (Z. Naturforsch. 31a, 1011—1013 [1976]; received May 29 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1011_n.pdf 
 Identifier    ZNA-1976-31a-1011_n 
 Volume    31 
175Author    HenriR. LeribauxRequires cookie*
 Title    A Theory of the Excess Chemical Potential of Metals in Alloys as Related to Electrochemical Measurements  
 Abstract    Recent measurements of electromotive forces in electro-chemical cells have shown the feasibility of measuring re-lative chemical potentials of alloy components. The excess chemical potential is formulated from the excess Gibbs free energy AG& = AU*+P AV^-T AS^ (at constant P and T). The excess internal energy A t/ E is evaluated from the structure-dependent internal energy of the metals. T ZlS E is taken as zero (to a good approximation in lithium-magne-sium). P A V E is found to be negligible at atmospheric pres-sure. A calculation is made for the alloy Li—Mg at about 600 °C for the excess chemical potential We summarize here the main results for the co-hesive energy in the pseudopotential theory of metals 3 (per atom at density n): ° Z -(2) U = 
  Reference    (Z. Naturforsch. 31a, 1014—1016 [1976]; received May 13 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1014_n.pdf 
 Identifier    ZNA-1976-31a-1014_n 
 Volume    31 
176Author    H. Oehling, F. BaerRequires cookie*
 Title    Rotationsbarriere der Endgruppen bei Poly- methinoxonolen verschiedener Kettenlänge  
 Abstract    Polymethine oxonols show temperature dependent *H-NMR-spectra because of restricted rotation of the end groups. The dependence of the value of the corresponding free enthalpy of activation AGt on the length of the poly-methine chain can be explained by the change of the ^-elec-tron contribution to A G+. Bei den Polymethinoxonolen 1 1 — 4 • ln=0 BF * 3n=2 4n =3 
  Reference    (Z. Naturforsch. 31a, 1017—1018 [1976]; eingegangen am 5. Mai 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1017_n.pdf 
 Identifier    ZNA-1976-31a-1017_n 
 Volume    31 
177Author    Ulrich Steiner, Gerhard Winter, HorstE A KramerRequires cookie*
 Title    Physical Triplet Quenching by Electron Donors  
 Abstract    Absolute radical yields, as determined by flash spectro-scopy, are reported for the reaction of the thionine triplet 3 TH + and its protonated form 3 TH2 ++ with a variety of elec-tron donors in methanolic solution. The different yields, ex-trapolated to infinite donor concentrations, are due to partial physical quenching of the triplets in the electron transfer reaction. The results are indicative of a triplet exciplex as an intermediate in the electron transfer reaction. 
  Reference    (Z. Naturforsch. 31a, 1019—1021 [1976]; received June 16 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1019_n.pdf 
 Identifier    ZNA-1976-31a-1019_n 
 Volume    31 
178Author    J. Koller, M. Žaucer, A. AžmanRequires cookie*
 Title    LCAO Approach to SCF-Xa Method  
 Abstract    An LCAO approach to the Slater SCF-Xa method is de-scribed. The equilibrium distances and Hellman-Feynman forces are determined. 
  Reference    (Z. Naturforsch. 31a, 1022—1023 [1976]; received May 31 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1022_n.pdf 
 Identifier    ZNA-1976-31a-1022_n 
 Volume    31 
179Author    D. H. Kurlat, M. Rosen, G. QuintanaRequires cookie*
 Title    Self-diffusion of Tin in a liquid Tin-Lead alloy at the Eutectic Composition  
 Abstract    By the shear cell technique, the self-diffusion coefficient (Dsn) of tin in a liquid Sn — 38.1 wt% Pb alloy has been measured in the temperature range 466 to 786 K. The slope of the Dsn vs. T curve decreases up to about 573 K, where it gets constant. This behaviour may be explained by the cluster hypothesis. 
  Reference    (Z. Naturforsch. 31a, 1024 [1976]; received May 5 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1024_n.pdf 
 Identifier    ZNA-1976-31a-1024_n 
 Volume    31 
180Author    R. HaaseRequires cookie*
 Title    Diffusion and Viscous Flow in Ideal Binary Liquid Mixtures  
 Abstract    We discuss the dependence of the diffusion coefficient and of the viscosity on the temperature and on the composition for ideal binary liquid mixtures, in particular for the system chlorobenzene + bromobenzene. The activation energy for dif-fusion is independent of the composition and exceeds the activation energy for viscous flow which is a linear function of the mole fractions. 
  Reference    (Z. Naturforsch. 31a, 1025 [1976]; received June 21 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-1025_n.pdf 
 Identifier    ZNA-1976-31a-1025_n 
 Volume    31 
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