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1970 (369)
1Author    R. Brändle, G. J. Krüger, W. Müller-WarmuthRequires cookie*
 Title    Impulsspektroskopische Untersuchungen der Elektronenspinrelaxation in freien Radikalen  
 Abstract    Direct measurements of the electronic relaxation times 7\ and T2 have been carried out in crystalline free radicals, in radicals diluted in solids, and in liquid solutions of free radicals. For this purpose, a pulse spectrometer operating at 9.3 GHz has been constructed, which is able to de-liver 90° pulses of 20 ns duration, and to determine relaxation times of 3'10 —8 s and longer. 7\-and ^-measurements on DPPH (Diphenylpicrylhydrazyl) and BPA (Bis-diphenylenephenylallyl) have shown that the relaxation is governed by interactions between the Zeeman system and the ex-change system of the electron spins down to the lowest temperature at which the ESR lines exist. The data are interpreted in terms of a simple model which takes into account exchange interaction between nearest neighbours of a linear chain of molecules. Furthermore, the electronic relaxation of organic crystals doped with free radicals has been investigated. — Finally, the relaxation of several free radicals has been studied in solutions of various organic liquids and of ammonia. From the temperature and concentration dependence it has been concluded that Tt can be explained by dipolar interactions between the electrons the time dependence of which is due to translational motion of the molecules. In contrast to nuclear relaxation data in liquids, the electronic Tx provides information for large co r-values, thus making possible a complete test of the theory of translational diffusion in liquids. 
  Reference    (Z. Naturforsch. 25a, 1—11 [1970]; eingegangen am 16. Oktober 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0001.pdf 
 Identifier    ZNA-1970-25a-0001 
 Volume    25 
2Author    Steven BrumbyRequires cookie*
 Title    Electron Spin Resonance Spectra of Aliphatic Nitrile Radicals  
 Abstract    Nitrile radicals have been generated in solution by photolysis of azo-compounds at 20 °C, and their electron spin resonance spectra have been studied. The radicals have the formula CH3C (CN) R where R=-CH3, -CH2CH3, -CH2CH2CH3 or -CH2C02CH3. 
  Reference    (Z. Naturforsch. 25a, 12—18 [1970]; received 5 September 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0012.pdf 
 Identifier    ZNA-1970-25a-0012 
 Volume    25 
3Author    Antonio GuarnieriRequires cookie*
 Title    Barrier to Internal Rotation, Centrifugal Distortion Analysis and Structural Considerations of Methanesulfenylchloride  
 Abstract    An investigation of the microwave spectrum of CH3SC1 35 in the excited torsional state has been carried out. The barrier to internal rotation and other connected parameters are thus obtained. A centrifugal distortion analysis of the microwave spectrum of CH3SC1 35 in the ground state is also performed to predict high J transitions. A /-"-structure and bond axis quadrupole coupling constants are also considered. 
  Reference    (Z. Naturforsch. 25a, 18—25 [1970]; received 18 October 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0018.pdf 
 Identifier    ZNA-1970-25a-0018 
 Volume    25 
4Author    H. Dreizler, H. D. Rudolph, H. MäderRequires cookie*
 Title    Mikrowellenspektrum, Hinderungspotential der internen Rotation, Quadrupolkopplungskonstanten und Dipolmoment des 2-Methyl-Pyridins *  
 Abstract    The microwave rotational spectrum of 2-methyl-pyridine (a-picoline) has been investigated in the region from 6 to 30 kmc/s. From the three lowest states of internal rotation m=0, 1, 2 the three-and sixfold components V3 and V6 of the potential barrier hindering the internal rotation have been determined to be V3= (258,4±0,1) cal/mole and V6= (— 11,8±0,1) cal/mole. From the splitting of low-/ lines m~0 the nuclear quadrupole coupling constants for the 14 N nucleus have been derived as Xaa= (-0,33±0,02) mc/s, Xbb = (-2,86±0,02) mc/s, Xcc = (+ 3,19±0,02) mc/s. The hyperfine structure of rotational transitions in excited states of internal rotation could also be accounted for with these coupling constants. The dipole moment components derived from Stark-effect measure-ments in the ground torsional state m = 0 are /ua = (0,72 ±0,01) Debye and fib — (1,71 ±0,02) Debye. 
  Reference    (Z. Naturforsch. 25a, 25—35 [1970]; eingegangen am 3. November 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0025.pdf 
 Identifier    ZNA-1970-25a-0025 
 Volume    25 
5Author    J. Hoeft, F. J. Lovas, E. Tiemann, T. TörringRequires cookie*
 Title    The Rotational Spectra and Dipole Moments of AgF and CuF by Microwave Absorption  
 Abstract    The rotational transitions 7=1-^-2 and 2-^-3 were measured for 107 Ag 19 F and 109 Ag 19 F by microwave absorption. These spectra allowed the determination of the Dunham-coefficients Y01, ^u » > an d Fq2 and from these the potential coefficients a0 and ax and internuclear distance re were derived. For 63 Cu 19 F and 65 Cu 19 F the hyperfine structure was observed in the 7=0 1 and 1 2 rotational spectra. In addition to the Dunham coefficients the quadrupole coupling constants, e q Q, and spin-rotation coupling constant, c, for the Cu nucleus were obtained. Stark effect mea-surements on both AgF and CuF resulted in the determination of the electric dipole moment for the ground vibrational state. 
  Reference    (Z. Naturforsch. 25a, 35—39 [1970]; received 23 October 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0035.pdf 
 Identifier    ZNA-1970-25a-0035 
 Volume    25 
6Author    W. Dietrich, B. Gross, R. KosfeldRequires cookie*
 Title    Kernmagnetische Relaxation und Selbstdiffusion in Benzol  
 Abstract    Es wurden erneut die longitudinale Relaxationszeit Tx und der Selbstdiffusionskoeffizient Ds des Benzols zwischen 0 °C und 100 °C gemessen. Besondere Sorgfalt galt hierbei der Temperierung der Probe. Nach der Relaxationstheorie von HUBBARD erfordert die Temperaturabhängigkeit des Spin-Rotations-Relaxationsprozesses ein starkes Anwachsen des Quotienten aus Selbstdiffusions-koeffizient und longitudinaler Relaxationszeit. Es wird jedoch mit steigender Temperatur eine Ab-nahme von Ds/T1 entsprechend der Dichteänderung des Benzols beobachtet. Hieraus folgt, daß der Spin-Rotations-Prozeß bei Benzol zwischen 0 °C und 100 °C keinen wesentlichen Einfluß auf die longitudinale Relaxation besitzt. Dadurch lassen sich die inter-und intramolekularen Anteile des Relaxationsprozesses allein aus temperaturabhängigen Messungen von 7\ , Ds und Q in einfacher Weise bestimmen. 
  Reference    (Z. Naturforsch. 25a, 40—4 [1970]; eingegangen am 30. Oktober 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0040.pdf 
 Identifier    ZNA-1970-25a-0040 
 Volume    25 
7Author    J. Edwards, M. V. EncinaRequires cookie*
 Title    Vapour Pressure and Activity Coefficients of Dilute 2,2,4 Trimethylpentane(Isooctane)-Acetone Mixtures  
 Abstract    Vapour pressure measurements are carried out to test Raoult's law at extreme concentrations, and the deviations are reported. — The azeotropic point is measured and qualitative discussions are presented. 
  Reference    (Z. Naturforsch. 25a, 45—17 [1970]; received 12 September 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0045.pdf 
 Identifier    ZNA-1970-25a-0045 
 Volume    25 
8Author    J. MeinrenkenRequires cookie*
 Title    Das Verhalten von Tetrafluorkohlenstoff und Tetrafluorkohlenstoff-Krypton-Gemischen im Trennrohr  
 Abstract    Das Verhalten von Tetrafluorkohlenstoff und Gemischen mit Krypton im Trennrohr wird experi-mentell untersucht. Die Auftrennung der Kohlenstoffisotope zeigt ein normales Verhalten, die Trenn-faktoren sind jedoch kleiner als bei anderen Kohlenstoffverbindungen. Während die Kryptonisotope untereinander mit zunehmenden CF4-Konzentrationen schlechter getrennt werden, reichert sich um-gekehrt 12 CF4 gegen 13 CF4 mit steigendem Zusatz von Krypton verstärkt an. 12 CF4 wird unter den beschriebenen Versuchsbedingungen gegenüber dem um 10 Masseneinheiten leichteren Krypton-isotop 78 zur warmen Seite transportiert. Somit ist CF4 als quasi-isotopes Hilfsgas zur Auftrennung leichter Kryptonisotope, Krypton als extraktives Hilfsgas zur Anreicherung der Kohlenstoffisotope brauchbar. 
  Reference    (Z. Naturforsch. 25a, 48—51 [1970]; eingegangen am 18. September 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0048.pdf 
 Identifier    ZNA-1970-25a-0048 
 Volume    25 
9Author    Dante Leonesi, Mario Braghetti, Augusto Cingolani, Paolo FranzosiniRequires cookie*
 Title    Molten Mixtures of K, Na Formates with Alkali Halides. Note I  
 Abstract    The eutectic compositions and temperatures were determined in a series of mixtures type HCOOK+MeX and HCOONa+MeX (where Me = Li, Na, K, Rb, Cs, and X = C1, Br, I). Moreover, a detailed map of the accessible portion of the liquidus area in the system K + , Na + /HCOO , CI , showing the isotherms up to 300 °C, was drawn. 
  Reference    (Z. Naturforsch. 25a, 52—55 [1970]; received 10 October 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0052.pdf 
 Identifier    ZNA-1970-25a-0052 
 Volume    25 
10Author    Dante Leonesi, Giammario Piantoni, Paolo Franzosini, Hcook+. Nabr, =. Hcoona, +. Kbr, Hcook+. Nal, =. Hcoona, +. KiRequires cookie*
 Title    Molten Mixtures of K, Na Formates with Alkali Halides. Note II * Concerning the exchange reactions  
 Abstract    By employing a visual method, solid-liquid equilibria were studied in a wide series of molten mixtures in order to draw the maps of the reciprocal systems formed with K, Na formates and bro-mides or iodides. Within the accessible portion of each system, five crystallization regions, three ternary eutectics and two saddle points were identified. The interdependence between the areas of some crystallization regions and the sizes of the halogen ions was put into evidence. In the present paper we report on the topology of the liquidus areas in the reciprocal ternary sys-tems K + , Na + /HCOO~, (Br", I"). Free energy data being unavailable, it was only possible to try to identify the stable pairs merely on the basis of the heats of formation of the component salts, which were tabulated 1 as follows: for HCOOK AHt° (298.16 °K) = -158.0 kcal/mole 
  Reference    (Z. Naturforsch. 25a, 56—58 [1970]; received 10 October 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0056.pdf 
 Identifier    ZNA-1970-25a-0056 
 Volume    25 
11Author    H. A. Schaeffer, H. J. OelRequires cookie*
 Title    Massenspektrometrisches Verfahren zur Bestimmung der Sauerstoff-Selbstdiffusion in Gläsern  
 Abstract    Mass spectrometric method for determining oxygen self-diffusion in glasses A mass spectrometric method has been developed employing 0 18 labelled oxides in order to study isotope exchange between two different glasses. The method provides self-diffusion coefficients for compact glass materials below the softening points without restrictions of the diffusion anneal-ing time. Concentration profiles were obtained by grinding off thin layers and analysing the ratio of 0 18 /0 16 for each layer. The extraction of oxygen from the glass is based on the reduction by mercuric cyanide at 400 °C to yield carbon dioxide. As an example diffusion profiles of O 18 have been measured in samples of two lead glasses. Diffusion coefficients were calculated applying dif-fusion equations for two-phase systems. The temperature dependence fitted an Arrhenius plot, thus indicating the activation energies. It has been shown that the distribution of O 18 is controlled by oxygen self-diffusion and is not affected by the difference in chemical composition of the two glasses nor by physical or chemical solubility of oxygen from air-atmosphere. 
  Reference    (Z. Naturforsch. 25a, 59—64 [1970]; eingegangen am 15. August 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0059.pdf 
 Identifier    ZNA-1970-25a-0059 
 Volume    25 
12Author    Kyong-Min KimRequires cookie*
 Title    Abscheidung der intermetallischen Verbindung Nb3Sn aus der Gas-Phase  
 Abstract    Thermochemical calculations and experimental investigations were made for the vapor deposition of the superconducting intermetallic compound Nb3Sn through the reduction of the component halides with hydrogen. The standard free enthalpy AGT^, the equilibrium constant Kp and the yield a were calculated. The influence of the gas composition and of the temperature on the stoichiometry and the yield of the deposited Nb3Sn were investigated. Von HANAK 1 wurde die supraleitende intermetal-lische Verbindung Nb3Sn aus der Gas-Phase abge-schieden, wobei die Chloride durch Wasserstoff re-duziert wurden. In dieser Arbeit wird an Hand der thermodynamischen Berechnungen und Modellver-suche über den Chemismus des Verfahrens berichtet. Das Hanaksche Verfahren besteht aus zwei Grup-pen von diemischen Reaktionen: a) Bildung der Chloride durch direkte Chlorierung der Metalle Niob und Zinn mit Chlorgas, b) anschließende Reduktion der beiden Chloride mit Wasserstoff zur Nb3Sn-Bildung auf erhitztes Substrat. In den folgenden Abschnitten werden die norma-len freien Enthalpien der chemischen Reaktionen be-redinet und die Modellversuche beschrieben. Die freien Enthalpien wurden mit Hilfe der Beziehung AG°T =AH% -TAS° T T T = AH%8 -TAS&» + \ ACp AT-T\ AC t p AT 298 298 (1) und der thermochemischen Daten in Tab. 1 berech-net. 
  Reference    (Z. Naturforsch. 25a, 64—69 [1970]; eingegangen am 22. Oktober 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0064.pdf 
 Identifier    ZNA-1970-25a-0064 
 Volume    25 
13Author    H. BispinckRequires cookie*
 Title    Der Einfluß von Gitterdefekten auf die optischen Konstanten von Kupfer The Influence of Lattice Defects on the Optical Properties of Copper  
 Abstract    The real and imaginary parts of the dielectric constant of thick copper films are determined in the wavelength range from 0.32 to 2.5 ^m. In addition the dc resistivity of the samples is measured. The films are evaporated in ultrahigh vacuum onto cooled substrates and annealed. Thereby the degree of lattice disorder can be reduced stepwise. The optical properties are interpreted by means of a slightly modified Drude-theory for A > 0.8 ^m. The variations of the dc resistivity obtained by optical measurements agree with the results of the electrical measurements. 
  Reference    (Z. Naturforsch. 25a, 70—79 [1970]; eingegangen am 24. Oktober 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0070.pdf 
 Identifier    ZNA-1970-25a-0070 
 Volume    25 
14Author    H. Meier, W. Albrecht, D. Bösche, W. Hecker, P. Menge, A. Ruckdeschel, E. Unger, G. Zeitler, E. ZimmerhacklRequires cookie*
 Title    Über die Existenz einer unbekannten natürlichen a-Aktivität im 4,3 — 4,6 MeV-Bereich  
 Abstract    In vorliegender Arbeit wird nach Diskussion der auf dem Gebiet der natürlichen Radioaktivität offenstehenden Fragen über die bei Aufarbeitung von Platinerzen, speziell von Osmiridium, erhal-tenen Ergebnisse berichtet. Die Untersuchungen ergaben, daß in Osmiridiumproben verschiedener Herkunft neben Radionukliden der natürlichen Zerfallsreihen (Konzentration <1 ppm) eine a-Ak-tivität im 4,3 —4,6 MeV-Bereich und eine y-Strahlung bei 200 — 220 keV auftritt, die sich keinen bekannten Radionukliden zuordnen läßt. Der mögliche Zusammenhang zwischen dieser aus Osmiridium angereicherten Aktivität und der von verschiedenen Arbeitsgruppen in Erzen und Mineralien (Molybdänglanz u. a.) beobachteten analogen a-Aktivität im 4,3 — 4,6 MeV-Bereich wird diskutiert. Audi werden geochemische Effekte erörtert (überhöhte 235 U-, 239 Pu-Gehalte geologischer Proben u. a.), deren wahrscheinliche Verbin-dung zur 4,3 —4,6 MeV-a-Strahlung die Existenz natürlicher Transuranisotope mit einer Ordnungs-zahl Z > 96 andeutet. Auf die Frage einer Verbindung zwischen der in platinmetallhaltigen Frak-tionen gefundenen Aktivität und in der Natur eventuell vorhandenen superschweren Elementen der Eka-Platinmetallgruppe wird ebenfalls eingegangen. 
  Reference    (Z. Naturforsch. 25a, 79—87 [1970]; eingegangen am 15. August 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0079.pdf 
 Identifier    ZNA-1970-25a-0079 
 Volume    25 
15Author    J. G. Krüger, D. K. CallebautRequires cookie*
 Title    Relations between Adiabatic and Incompressible (Non-Adiabatic) Systems and Their Stability  
 Abstract    We examine in general whether the results valid for an incompressible, non-adiabatic system can be deduced from the results valid for an adiabatic (or a more general) system. A simple rule will be established by which an energy principle for incompressible, non-adiabatic perturbations is obtained from the energy principle for adiabatic perturbations. Application yields in particular the energy principles for magnetodynamic, respectively gravitational, respectively gravitational and magnetodynamic stability for incompressible, non-adiabatic perturbations which are the analogues of the energy principles of Bernstein et al., respectively Chandrasekhar, respectively Krüger and Callebaut for adiabatic perturbations. It is proved that an equilibrium state is more stable or at least equally stable for incompressible, non-adiabatic perturbations than for adiabatic ones. The conditions under which the adiabatic re-gime and the incompressible one are both stable or both unstable are studied. More detailed comparison theorems are enunciated for the case of magnetodynamic stability and all cases where the energy integral for y — 0 is independent of £|| the component of % parallel to B. If div ^ can be chosen arbitrarily when \ j is given then the adiabatic and the incompressible re-gimes are both stable or both unstable. A detailed examination whether div ^ can be chosen arbi-trarily or not due to the presence of closed field lines leads to a classification of the perturbations in two cases. We compare the stability between these two cases for the adiabatic regime and for the incompressible one and for each case, the stability between both regimes. A similar analysis is given for restrictive conditions on div ^ due to the presence of closed pressure shells. In general only one case of the complete classification has to be considered to decide on the stability. More-over the adiabatic and incompressible regimes are both stable or both unstable for most infinitely long tubes. The whole treatment is illustrated by the example of the linear pinch. The macroscopic description of a multiparticle system is usually based on the conservation of mass, momentum, energy, magnetic flux and entropy 1 (adiabatic system). For an incompressible fluid, the conservation of entropy is replaced by the conser-vation of mass density (incompressible, non-adia-batic system). Either one of the descriptions may be used according to the chosen model of the physi-cal situation. The adiabatic regime (A) is some-times replaced by the incompressible one (regime I) for reasons of mathematical simplicity. It is of in-terest to know the relations between both descrip-tions and their stability. It is well-known that an energy principle can be developed for regime A. Whether this is possible for the regime I and whether the energy principle for regime I follows from the one for A is not a matter of course and will be examined carefully. The analysis leads to a comparative study between 
  Reference    (Z. Naturforsch. 25a, 88—100 [1970]; received 5 July 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0088.pdf 
 Identifier    ZNA-1970-25a-0088 
 Volume    25 
16Author    J. OxeniusRequires cookie*
 Title    Effect of Inelastic Collisions on the Tail of the Electron Velocity Distribution  
 Abstract    The effect of inelastic electron collisions with two-level atoms, having either two bound levels or one bound level and a continuum, on the electron velocity distribution is reconsidered. Attention is paid to the role played by physical parameters like cross sections, atomic occupation numbers, and temperature. Distribution functions and collision rates are given in terms of easily accessible tabulated functions. 
  Reference    (Z. Naturforsch. 25a, 101—105 [1970]; received 10 September 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0101.pdf 
 Identifier    ZNA-1970-25a-0101 
 Volume    25 
17Author    W. MuschlerRequires cookie*
 Title    Über ein Verfahren zur gleichzeitigen Bestimmung von Elektronenkonzentration und Elektronenstoßzahl in einem homogenen isotropen oder in einem langsam veränderlichen Plasma  
 Abstract    A method is described, which allows determination of the complex refractive index of a plasma by separate measurement of the E-and H-component of an electromagnetic wave. By means of the complex refractive index simultaneously electron concentration and electron collision frequency of the medium can be stated. The measuring frequency depends upon absorption, precision requirements, and — for a locally varying medium — upon the availability range of theory used. General considerations are applied to a plasma model (terrestrial ionosphere without magnetic field) : Simultaneous measurement of electron concentration and electron collision frequency should be well possible within a height range corresponding to the terrestrial D-region. In higher regions determination of the (decreasing) electron collision frequency becomes more and more difficult, whereas possibilities for determination of the (increasing) electron concentration seem to improve. The influence of reflected waves is considered in a following paper 4 . I. Allgemeine Betrachtungen zum Verfahren 1.1. Grundprinzip des Meßverfahrens: Bestimmung des komplexen Brechungsindex 
  Reference    (Z. Naturforsch. 25a, 106—114 [1970]; eingegangen am 2. August 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0106.pdf 
 Identifier    ZNA-1970-25a-0106 
 Volume    25 
18Author    ArunK. MitraRequires cookie*
 Title    Multicollisions in the Linearized Boltzmann-Landau Transport Equation  
 Abstract    The treatment of the linearized Boltzmann-Landau equation in the binary collision approxima-tion given in an earlier paper 4 has been extended, under certain assumption, to include all collision processes. The effect of ternary collisions on the transport coefficients in particular has been ob-tained in a subsequent paper. 
  Reference    (Z. Naturforsch. 25a, 115—120 [1970]; received 20 October 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0115.pdf 
 Identifier    ZNA-1970-25a-0115 
 Volume    25 
19Author    ArunK. MitraRequires cookie*
 Title    The First Order Density Corrections Including Ternary Collisions in a Boltzmann-Landau Gas  
 Abstract    The first order density corrections to the coefficients of viscosity (rj) and thermal conductivity (A) in a Boltzmann-Landau gas have been calculated including the effect of ternary collisions. 
  Reference    (Z. Naturforsch. 25a, 121—126 [1970]; received 20 October 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0121.pdf 
 Identifier    ZNA-1970-25a-0121 
 Volume    25 
20Author    A. D. JannussisRequires cookie*
 Title    One-Dimensional N-body Problem with 8-Interaction  
 Abstract    We have studied the one dimensional A-body problem with delta-function interaction and width 2 C. To determine the ground-state energy and the excitation spectrum we arrive at integral equations similar to the equation of Hulthen. The solution of the integral equation is achieved by the moments method and the results are compared with those found in the literature. 
  Reference    (Z. Naturforsch. 25a, 127—134 [1970]; received 16 July 1969) 
  Published    1970 
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 TEI-XML for    default:Reihe_A/25/ZNA-1970-25a-0127.pdf 
 Identifier    ZNA-1970-25a-0127 
 Volume    25 
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