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1976 (300)
101Author    Friedrich Becker, Michael Kiefer, Peter RhensiusRequires cookie*
 Title    Die molare freie Zusatzenthalpie am kritischen Entmischungspunkt als Kriterium für Modelltheorien flüssiger Mischungen * Molar Excess Free Energy at the Critical Solution Point as a Criterion of Model Theories for Liquid Mixtures  
 Abstract    Theoretical expressions of G-/RT for symmetric and unsymmetric binary liquid mixtures, as proposed by Guggenheim, Redlich and Kister, van Laar, Renon and Prausnitz, are compared with the equilibrium model theory which we have developed some years ago, with respect to their predic-tions of Gc^/RTc , and its dependence on the number of nearest neighbours, on the critical mole fraction, and on other model parameters. Equilibrium models allow discussion of critical mixing by means of a relation between the two equilibrium constants used. This is done for two typical examples: Mutual unspecific solvation of both components, coupled with (1) unsymmetric self-association. and (2) unsymmetric specific solvation. A discussion of phase separation at negative values of G^p-jRTc is given. Von theoretischen Ansätzen, die den Verlauf der thermodynamischen Zusatzfunktionen binärer flüs-siger Mischungen als Funktionen des Molenbruchs beschreiben, ist zu fordern, daß sie auch das Gleich-gewichtsverhalten flüssig-flüssig, d. h. die Möglich-keit eines Zerfalls in zwei koexistente flüssige Pha-sen, wiedergeben. Die Bedingungen für das Auf-treten eines kritischen Entmischungspunktes lauten: 
  Reference    (Z. Naturforsch. 31a, 602—610 [1976]; eingegangen am 30. März 1976) 
  Published    1976 
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 Identifier    ZNA-1976-31a-0602 
 Volume    31 
102Author    G. Heppke, F. SchneiderRequires cookie*
 Title    Anisotropie der elektrischen Leitfähigkeit verschiedener Elektrolyte in einem nematischen flüssigen Kristall  
 Abstract    Anisotropy The electric conductivity of twelve electrolytes dissolved in a nematic liquid crystal is investi-gated. The anisotropy ratio of the electric conductivity varies between 1.23 and 1.68 at room temperature, the highest values being caused by elongated ions. For some of the electrolytes the temperature dependence of the anisotropy ratio indicates the presence of cybotactic groups in the nematic phase. 
  Reference    (Z. Naturforsch. 31a, 611—614 [1976]; eingegangen am 12. April 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0611.pdf 
 Identifier    ZNA-1976-31a-0611 
 Volume    31 
103Author    Chiara Margheritis, Cesare Sinistri, Giorgio FlorRequires cookie*
 Title    Thermodynamic and Structural Properties of Molten CsCl as Obtained by Computer Simulation  
 Abstract    CsCl was computer simulated using the Monte Carlo (MC) method on the basis of interionic pair potentials. Calculations were carried out at constant pressure (1 atm) and at different tem-peratures covering the liquid phase. The thermodynamic and structural properties thus obtained were in good agreement with the corresponding experimental values when available. A discussion of these properties in relation to those of CsBr and Csl was also carried out. Finally the polarization energy of CsCl along with those of CsBr and Csl, was compared with the results that can be obtained using simpler models recently proposed. 
  Reference    (Z. Naturforsch. 31a, 615—618 [1976]; received April 22 1976) 
  Published    1976 
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 Identifier    ZNA-1976-31a-0615 
 Volume    31 
104Author    Giorgio Flor, Riccardo RiccardiRequires cookie*
 Title    Kinetics of MgW04 Formation in the Solid State Reaction between MgO and WOs  
 Abstract    The solid state reaction of MgW04 formation from MgO (single crystals) and W03 was investi-gated in the temperature range 800 — 985 °C under both air and argon atmosphere. The techniques employed for the kinetic study (contact and thermogravimetric methods) allowed to point out that the process follows the linear rate law in the early stages and the parabolic one in the subsequent stages. From inert marker experiments, kinetic determinations under the two different atmospheres and conductivity measurements, it was possible to state that the reaction is governed by a cation counter-diffusion mechanism. 
  Reference    (Z. Naturforsch. 31a, 619—621 [1976]; received April 2 1976) 
  Published    1976 
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 Identifier    ZNA-1976-31a-0619 
 Volume    31 
105Author    K. DrägerRequires cookie*
 Title    Die Stärke der antiferromagnetischen Kopplung in Gallium-dotiertem a-Cr203  
 Abstract    The Intensity of the Antiferromagnetic Coupling in Gallium-doped, a-Cr203 
  Reference    (Z. Naturforsch. 31a, 622—629 [1976]; eingegangen am 2. April 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0622.pdf 
 Identifier    ZNA-1976-31a-0622 
 Volume    31 
106Author    Olaf-Rene Hartmann, Karl-Peter Wanczek, Hermann HartmannRequires cookie*
 Title    Mass Spectrum, Mechanism and Structure in the Ion Chemistry of Trimethylmethylenephosphorane  
 Abstract    The gas phase ion chemistry of the simplest known phosphorus ylide, trimethylmethylenephos-phorane, has been studied in the mass range m/e=2 — 186 and the pressure range 10~ 7 —10 -4 Torr. The most abundant product ion, m/e = 104, (CH3) 2C2H5PCH2' + is formed by a methylene group transfer reaction of the molecular ion. Almost all of the other product ions formed from the molecular ion can be subsumed under the general formula (CH3) 3PCHPRn + (R = H, CH3; n=1,2,3). The reactions indicate that the molecular ion has lost its ylide character almost com-pletely. The protonated molecule is formed almost exclusively by a reaction of the fragment ion m/e = 75. This reaction and the CH3PH group transfer reaction indicate a cyclic structure (CH3) HP(CH2)2 + for this ion. A cyclic structure is also assumed for the ion mje = 73, PC3H6 + , which undergoes P and PH transfer reactions. The reactions of the ion m/e = 47 are consistent with the structure CHSPH + . The ICR and mass spectra are given, some metastable decompositions are discussed. 
  Reference    (Z. Naturforsch. 31a, 630—636 [1976]; received April 15 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0630.pdf 
 Identifier    ZNA-1976-31a-0630 
 Volume    31 
107Author    M. Kertesz, J. Koller, E. Zakrajšek, A. AžmanRequires cookie*
 Title    Ab-initio Crystal Orbital Study of One-Dimensional Hydrogen Bonded Chain-Formic Acid  
 Abstract    Ab initio crystal orbital calculations on the ß-and a-form are described. The binding energies and charge rearangement in hydrogen bonded chains are discussed. 
  Reference    (Z. Naturforsch. 31a, 637—638 [1976]; received March 15 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0637.pdf 
 Identifier    ZNA-1976-31a-0637 
 Volume    31 
108Author    J. BettenRequires cookie*
 Title    Zur physikalischen Deutung der Hill-Bedingung  
 Abstract    About the Physical Interpretation of the Hill-Condition In this paper it is shown, that the Hill-Condition can be identified with the elastic strain energy of distortion for incompressible materials. The Mises-Potential for anisotropic materials can be identified with the elastic strain energy. 
  Reference    (Z. Naturforsch. 31a, 639 [1976]; eingegangen am 17. April 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0639.pdf 
 Identifier    ZNA-1976-31a-0639 
 Volume    31 
109Author    P.J P De MaayerRequires cookie*
 Title    Effect of Defect Structure on the Optical Dispersion Properties of Thin Films of TiN  
 Abstract    Thin films of TiNx with controlled composition were prepared by means of reactive electron-beam evaporation. Their microspecular reflectance was measured as a function of both wavelength and deviation from stoichiometry. The correlation between the electrical and optical properties as suggested by Hagen-Rubens and Drude was demonstrated. 
  Reference    (Z. Naturforsch. 31a, 642—644 [1976]; received April 16 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0642.pdf 
 Identifier    ZNA-1976-31a-0642 
 Volume    31 
110Author    W. Hoppe, H. J. Schramm, M. Sturm, N. Hunsmann, J. GaßmannRequires cookie*
 Title    Three-Dimensional Electron Microscopy of Individual Biological Objects Part I. Methods  
  Reference    (Z. Naturforsch. 31a, 645—655 [1976]; received March 30 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0645.pdf 
 Identifier    ZNA-1976-31a-0645 
 Volume    31 
111Author    G. Goldmann, K. TödheideRequires cookie*
 Title    Measurement of PVT Data for Molten Potassium Chloride to 1320K and 6 kbar  
 Abstract    PVT data of molten KCl as a typical example for an ionic melt have been measured between 770 and 1050 °C at pressures up to 6 kbar. The experiments were performed in an internally heated pressure vessel containing argon as pressure transmitting medium. The salt was enclosed in a stainless steel cell the volume of which could be varied by means of a metal bellows and measured by monitoring the displacement of one end of the cell using an inductive transducer. The accuracy of the density data obtained is 0.15% for pressures below 2 kbar and 0.4% for higher pressures. 
  Reference    (Z. Naturforsch. 31a, 656—663 [1976]; received April 13 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0656.pdf 
 Identifier    ZNA-1976-31a-0656 
 Volume    31 
112Author    M. SorgRequires cookie*
 Title    Non-local Generalization of the Lorentz-Dirac Equation and the Problem of Runaway Solutions  
 Abstract    A new, covariant equation of motion for the radiating electron of finite extension is proposed. This new equation excludes the notorious runaway solutions and pre-acceler-ation. Recently a finite-size model of the classical radi-ating electron has been developed 2 , which re-duces to the famous Lorentz-Dirac theory 3 ' 4 , if a certain point limit * is performed. In this finite-size model no runaway solutions can occur, as is demon-strated in a future paper; and since the finite size of the electron has led to a non-local equation of motion for the radiating electron, one might rise the question whether the absence of runaway solu-tions is a common feature of all possible nonlocal generalizations of the Lorentz-Dirac equation 
  Reference    (Z. Naturforsch. 31a, 664—665 [1976]; received May 6 1976) 
  Published    1976 
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 Identifier    ZNA-1976-31a-0664_n 
 Volume    31 
113Author    J. U. Von Schütz, D. Bloor, W. Steudle, H. C. Wolf, D. J. AndoRequires cookie*
 Title    Proton Spin-Rotational Interaction in Crystalline l-Hydroxy-2,4-Hexadiyne  
 Abstract    The amplitude and temperature dependence of the longi-tudinal proton spin relaxation time 7\ in crystalline 1-hydroxy-2,4-hexadiyne is caused by the activated process of the CHj-group reorientation. The low hindering barrier of 4.4 kj/mole leads above 200 K to relaxation contributions by spin-rotational interaction, which are comparable to the dipolar interaction. 
  Reference    (Z. Naturforsch. 31a, 666—667 [1976]; received April 16 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0666_n.pdf 
 Identifier    ZNA-1976-31a-0666_n 
 Volume    31 
114Author    G. L. Moore, F. R. Buskirk, E. B. Dally, J. N. Dyer, X. K. Maruyama, R. PitthanRequires cookie*
 Title    The Widths of the E2 (AT = 0 and AT = 1) Giant Resonances in 165 Ho  
 Abstract    > Inelastic electron scattering confirms broadening of the ^ isoscalar (/dT=0) E2 giant resonance in 165 Ho as compared to spherical nuclei. Discrepancies in magnitude between £ results of other experiments are reconciled. The isovector b {AT=1) E2 giant resonance is, for the first time, observed to be split into at least two parts. ^ -o 
  Reference    (Z. Naturforsch. 31a, 668—669 [1976]; received March 20 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0668_n.pdf 
 Identifier    ZNA-1976-31a-0668_n 
 Volume    31 
115Author    L. Engelbrecht, D. H. SutterRequires cookie*
 Title    Microwave Spectrum, Partial r0-Structure and 14 N-Quadrupole Coupling Constants of 2-Cyanfurane  
 Abstract    The microwave spectrum of 2-Cyanfurane was investi-gated in the frequency range between 11 and 39 GHz. The rotational constants of the most abundant species indicate that the Cyano-group is bent toward the ring oxygen at the central C-atom. From the measured quadrupole coupling constants one may conclude that jr-electron density is pulled from the ring toward the Nitrogen atom. 
  Reference    (Z. Naturforsch. 31a, 670—672 [1976]; received April 28 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0670_n.pdf 
 Identifier    ZNA-1976-31a-0670_n 
 Volume    31 
116Author    K.Il Becker, H. Engels, T. TatarczykRequires cookie*
 Title    Laserspektroskopische Untersuchungen an nicht-stabilisierten N2 (B 3 iTg,t; = 13)-Molekülen  
 Abstract    Laser Spectroscopic Studies on Non-stabilized N2(B 3 Ilg,v = 13) molecules Unstabilized N2(B 3 77g , v = 13) quasi-molecules were analysed by excitation with a tunable dye-laser into the N2(C 3 77u) state and observation of the following fluores-cence to N2 (B 3 77g, v) levels. The quasi-molecules are in equilibrium with the free nitrogen atoms. The detection limit of this technique is 10 3 molecules/cm 3 . By the same method, a rotational analysis of molecules stabilized into (B 3 77g, r^l2) levels by three-body recombination processes was achieved with a resolution better than that reached by emission spectroscopy of the Lewis-Rayleigh afterglow. 
  Reference    (Z. Naturforsch. 31a, 673—674 [1976]; eingegangen am 17. Mai 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0673_n.pdf 
 Identifier    ZNA-1976-31a-0673_n 
 Volume    31 
117Author    H. F. Aly, F. M. Abdel-Kerim, H. H. AfifiRequires cookie*
 Title    Electrical Properties of Some Divalent Transition Cupferrone Complexes  
 Abstract    From the temperature dependence of the electrical re-sistivity of the divalent Mn, Co, Ni, Cu and Zn cupferrone complexes it is concluded that these compounds behave as semiconductors. It is also found that the charge transfere (CT) energy as calculated from the UV absorption CT bands is always larger than that drived from the electrical resistivity. tained from "Renal" Finomvegyszergyar. The dif-ferent metal cupferrone complexes were prepared and analysed as previously reported The UV ab-sorption spectra of the different compounds were measured in dioxan using a Unicam Sp 800 record-ing spectrophotometer. The D.C. resistivities of the samples were measured on discs of 13 mm diameter and 3 — 5 mm thickness, prepared under a pressure of 12,000 kg/cm 2 . The measuring cell is shown in Figure 1. The cell was enclosed in an evacuated pyrex tube containing silica gel to keep the cell dry. A temperature controlled electric furnace was placed around the device. The current was measured with a VA-J-52 electrometer. 
  Reference    (Z. Naturforsch. 31a, 675—676 [1976]; received August 2 1975) 
  Published    1976 
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 Identifier    ZNA-1976-31a-0675_n 
 Volume    31 
118Author    Requires cookie*
 Title      
 Abstract    ;zo [a , i] carbazol 21 460 5,4 1,1 0,10 1,5 Dinaphtholl,2-b:2',l'-d] -thiorhen 20 660 1,6 0,76 IC,2 12,0 losen Tx —>-S0-Desaktivierung mit zunehmendem T'1-50-Intervall verständlich 4 . Für die N-Heterocyclen I, III und V sowie die strukturanalogen S-Heterocyclen II, IV und VI be-stehen recht gut erfüllte lineare Korrelationen zwi-schen tp und ^-Energie, bei den S-Heterocyclen ebenso zwischen 0p/0f und T^-Energie. Die struk-turanalogen N-resp. S-Heterocyclen VII und VIII fügen sich jedoch nicht in diese Korrelationen: So-wohl rp wie 0P/<Z>f-Werte sind zu groß. Über der-artige Abhängigkeiten von Lumineszenzparametern vom Bauprinzip von jr-Elektronensystemen ist bis-her wenig bekannt 2 ' 5 . 
  Reference    (Z. Naturforsch. 31a, 677 [1976]) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0677_n.pdf 
 Identifier    ZNA-1976-31a-0677_n 
 Volume    31 
119Author    P. Ferloni, M. Sanesi, P. FranzosiniRequires cookie*
 Title      
 Abstract    In a recent paper 1 the results of a calorimetric study on the phase transitions in the alkali Cj — n • C4 alkanoates were reported. Continuing the systematic investigation on salts with organic anions, the present work deals with the enthalpies and entropies of fusion (F) and of a few solid state transitions (sstr's) in calcium, strontium and barium propio-nates and n • butyrates, a salt group for which, as far as we know, thermochemical information is com-pletely lacking in the literature. Experimental 
  Reference    (Z. Naturforsch. 31a, 679—682 [1976]; received May 17 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0679_n.pdf 
 Identifier    ZNA-1976-31a-0679_n 
 Volume    31 
120Author    M. SorgRequires cookie*
 Title    The Problem of Runaway Solutions in the Lorentz-Dirac Theory  
 Abstract    A rigorous non-existence proof for runaway solutions in the finite-size model of the electron is given. Since a consistent point limit, such as the Lorentz-Dirac equation claims to be, should not exhibit features which are completely missing in the more general theory of finite extension, it is proposed that the point-like approximation of the finite-size theory be the integrodifferential for-mulation of the Lorentz-Dirac theory. This point of view is supported by a new discussion of the hyperbolic motion in the latter theory. 
  Reference    (Z. Naturforsch. 31a, 683—689 [1976]; received May 15 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0683.pdf 
 Identifier    ZNA-1976-31a-0683 
 Volume    31 
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