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1976 (300)
41Author    F. VollendorfRequires cookie*
 Title    Einheitliche Feldtheorie  
 Abstract    A theory is developed in which the gravitational as well as the electromagnetic field is described in a purely geometrical manner. In the case of a static central symmetric field Newton's law of gravitation and Schwarzschild's line element are derived by means of an action principle. The same principle leads to Fermat's law which defines the world lines of photons. 
  Reference    (Z. Naturforsch. 31a, 225—230 [1976]; eingegangen am 14. Februar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0225.pdf 
 Identifier    ZNA-1976-31a-0225 
 Volume    31 
42Author    Michael NippusRequires cookie*
 Title    Relative Raman-Intensitäten der Phononen von LiNb03  
 Abstract    Relative Raman Intensities of the Phonons of LiNb03 In the last few years the assignment of the optical phonons of LiNb03 to the different sym-metry species was often changed. We therefore concluded that the relative intensities of the Raman lines must be re-examined. According to all elements of the Raman tensor, the fundamental spectra were recorded separately as far as possible. The relative intensities are listed within an error of 7 or 40 percent, each according to signal-to-noise-ratio and/or overlapping of nearby lines. 
  Reference    (Z. Naturforsch. 31a, 231—235 [1976]; eingegangen am 19. Januar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0231.pdf 
 Identifier    ZNA-1976-31a-0231 
 Volume    31 
43Author    E. Tiemann, J. HoeftRequires cookie*
 Title    Hyperfeinstruktur des RbJ  
 Abstract    The quadrupole hyperfine structure of 85 Rb 127 I in the ground vibrational state was measured on the rotational transition /=3->4 at 7.9 GHz. From the observed spectra the following quadrupole coupling constants were derived: 85 Rb : e q0 Q= -40.40(30) MHz; 127 I : e q0 Q= -59.89(30) MHz. In der Gruppe der Rubidiumhalogenide ist mit der Methode der elektrischen Molekülstrahlresonanz die Hyperfeinstruktur (HFS) von Rotationszustän-den des RbF und RbCl beobachtet worden. Als ein Ergebnis dieser Messungen enthält Tab. 1 die Qua-Tab. 1. Quadrupolkopplungskonstanten von Rubidiumhalo-geniden und Alkalihalogeniden im Schwingungsgrundzustand r = 0. Molekül 85 Rb : eq0Q Molekül 127 J :eg0Q (MHz) (MHz) 
  Reference    (Z. Naturforsch. 31a, 236—238 [1976]; eingegangen am 30. Januar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0236.pdf 
 Identifier    ZNA-1976-31a-0236 
 Volume    31 
44Author    K. Höinghaus, H. W. Biermann, C. Zetzsch, F. StuhlRequires cookie*
 Title    Nachweis von atmosphärischem NO im ppb-Bereich mittels Fluoreszenzanregung durch NO-y-Banden  
 Abstract    An Optical Method to Monitor NO in Air, where NO Fluorescence is Excited by NO-y Bands An optical method to monitor NO in air and exhaust gas has been investigated. In this method NO is excited by NO-y-bands (A 2 X 2 IIT) generated in a microwave discharge and is detected by its subsequent fluorescence. Results indicate a linear detection range from 7.5 ppb to 1000 ppm in air using a time response of 10 s. Interferences from other atmospheric constituents are found to be small. The analysis requires only a small amount of sample gas. 
  Reference    (Z. Naturforsch. 31a, 239—243 [1976]; eingegangen am 23. Januar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0239.pdf 
 Identifier    ZNA-1976-31a-0239 
 Volume    31 
45Author    P. Hennig, G. StreyRequires cookie*
 Title    Anharmonic Force Field and Isotopic Relations of Ozone  
 Abstract    The anharmonic force constants of ozone up to fourth order have been determined from recent-ly published spectroscopic data of 16 03 and 18 Os . For the first time all experimental data presently available have been used in a least squares fit. Compared with recent work, the correct formula for the Darling-Dennison resonance parameter y has been used now. The nonuniqueness of the solution is discussed. In addition, isotopic rules for various spectroscopic parameters are derived. 
  Reference    (Z. Naturforsch. 31a, 244—250 [1976]; received February 5 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0244.pdf 
 Identifier    ZNA-1976-31a-0244 
 Volume    31 
46Author    W.-W FalterRequires cookie*
 Title    Photoleitung in 2,3-Dimethylnaphthalin bei gepulster Lichteinstrahlung  
  Reference    (Z. Naturforsch. 31a, 251—258 [1976]; eingegangen am 3. Februar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0251.pdf 
 Identifier    ZNA-1976-31a-0251 
 Volume    31 
47Author    OttoE. RösslerRequires cookie*
 Title    Chaotic Behavior in Simple Reaction Systems  
 Abstract    Chemical system theory, exotic kinetics, nonperiodic oscillation, 3-variable dynamical systems, strange attractors Deterministic nonperiodic flow (of "chaotic" or "strange" or "tumbling" type, respectively) was first observed, in a 3-component differential system, by E. N. Lorenz in 1963. A 3-component abstract reaction system showing the same qualitative behavior is indicated. It consists of (1) an ordinary 2-variable chemical oscillator and (2) an ordinary single-variable chemical hysteresis system. According to the same dual principle, many more analogous systems can be devised, no matter whether chemical, biochemical, biophysical, ecological, sociological, economic, or electronic in nature. Their dynamics are determined by the presence of a "folded" Poincare map. Under numerical simulation, the proposed chemical system provides an almost ideal illustration to the underlying dynamical prototype, the "3-dimensional blender". Thus, continuous Euklidean dynamics (and with it chemical kinetics) proves to be of equal interest in studying chaos as discrete dy-namical systems already have. 
  Reference    (Z. Naturforsch. 31a, 259—264 [1976]; received January 5 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0259.pdf 
 Identifier    ZNA-1976-31a-0259 
 Volume    31 
48Author    E. Hamer, D. H. SutterRequires cookie*
 Title    Molecular g-Values, Magnetic Susceptibility Anisotropics, Molecular Quadrupole Moments and Second Moments of the Electron Charge Distribution in Ethyleneoxide and Pyridine Isotopes An Attempt to Determine the Sign of the Electric Dipole Moment  
 Abstract    The high-field first and second order Zeeman effect has been observed in Ethyleneoxide V H»C--CH, and Pyridine -CD., in order to determine the sign of the electric dipole moments from the ^-values of different isotopes. The experimental data indicate that in Ethyleneoxide the negative end is at the Oxygen while in Pyridine the result is not conclusive. The effect of vibrations is discussed in some detail and it is concluded that the vibrational dependance of the ^-values should be accounted for if the sign of the dipole moment is determined from Zeeman data (at least if H <—D substitutions are involved). 
  Reference    (Z. Naturforsch. 31a, 265—271 [1976]; received January 22 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0265.pdf 
 Identifier    ZNA-1976-31a-0265 
 Volume    31 
49Author    Laszlo Nemes, Manfred WinnewisserRequires cookie*
 Title    Centrifugal Distortion Analysis of the Microwave and Millimeter Wave Spectra of Deuterated Ketenes 2  
 Abstract    Measurements of R and Q branch a-type pure rotational transitions in the frequency range from 8 GHz to 220 GHz are reported for ketene-d! and ketene-d2 . The microwave and millimeter wave transitions were analysed in terms of Watson's reduced Hamiltonian, including the sextic terms HKJ and HJK • The values of the inertial defect and the r defect obtained from the centrifugal distortion analysis are in accord with the planar model for the ketene molecule. 
  Reference    (Z. Naturforsch. 31a, 272—282 [1976]; received November 18 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0272.pdf 
 Identifier    ZNA-1976-31a-0272 
 Volume    31 
50Author    N.V S Rao, P. R. Kishore, T.F S Raj, M. N. Avadhanlu, C.R K MurtyRequires cookie*
 Title    Electric and Magnetic Field Effects in p-Methoxy Benzylidene p'-n-Butylaniline  
 Abstract    Molecular alignment in the nematic phase of p-methoxy benzylidene p'-n-butylaniline (MBBA) in the presence of electric and magnetic fields is investigated. The relative effectiveness of electric and magentic fields on the nematic liquid crystal MBBA is discussed. In the dielectric regime it is found that the threshold fields for chevron formation are considerably different from the threshold fields for inducing changes in the dielectric constant. 
  Reference    (Z. Naturforsch. 31a, 283—287 [1976]; received January 17 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0283.pdf 
 Identifier    ZNA-1976-31a-0283 
 Volume    31 
51Author    Helmut Gnann, Walter EichenauerRequires cookie*
 Title    Die Elektronenwärme von Legierungen des Systems MgCu2-MgNi2  
 Abstract    The Electronic Specific Heat in the System MgCu.2 — MgNi2 Measurements of the molar heat capacity in the quasi binary system MgCu2-MgNi2 from 1.5 to 4.2 K have been made in order to calculate the electronic specific heat. According to previous in-vestigations in other alloy systems (Laves phases) the Sommerfeld model for free electrons does not hold. The shape of the electronic specific heat function versus alloy composition is comparable to that of the susceptibility and in poorer agreement with the hydrogen solubility. Iron impurities in some alloy samples caused an anomalous temperature dependence of the heat capacity. 
  Reference    (Z. Naturforsch. 31a, 288—292 [1976]; eingegangen am 2. Februar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0288.pdf 
 Identifier    ZNA-1976-31a-0288 
 Volume    31 
52Author    E. W. Hennecke, 0. K. ManuelRequires cookie*
 Title    A Comparison of the Noble Gases in Three Meteorite Specimens Labeled Springfield  
 Abstract    The abundance and isotopic composition of the noble gases were measured in three Spring-field specimens identified by the Denver Museum of Natural History with numbers 7029, 379.13 and 6040. The latter specimen contains more cosmogenic noble gas isotopes than the other two specimens and the abundance pattern of trapped noble gases in specimen 6040 is distinct from that in the other two specimens. Specimen 7029 contains about seven times as much radiogenic 4t/ Ar and about four times as much radiogenic 129 Xe as does specimen 379.13. These results indi-cate that the three specimens did not come from a single meteoroid. 
  Reference    (Z. Naturforsch. 31a, 293 [1976]; received January 21 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0293.pdf 
 Identifier    ZNA-1976-31a-0293 
 Volume    31 
53Author    B. Carlsson, G. WettermarkRequires cookie*
 Title    Complex Constants and Ultraviolet Absorption Spectra for CuCl-Cl" Complexes in 1 M HC104  
 Abstract    The complex formation between Cu (I) Cl and Cl -was investigated in a 1 M HC104 ionic medium at 22 °C. In saturated CuCl(s) — Cl'-solutions over the concentration range 0 — 0.25 M Cl" the only complexes observed are CuCl2" and CuCl3 2-. The complex constants for the formation of these complexes are logßn = —1.31 and log/?12= —1.6 respectively. The UV-absorption spectra of CuCl2~ and CuCl3 2-were determined in the wavelength region 220 —370 nm. The absorption of CuCl," is characterized by a strong band Amax<200 nm (c>2.7 • 10 3) together with a weak band having Amax = 230nm (£ = 0.7-10 3). The spectrum of CuCl3 2-is composed of two bands with /max=230 nm (e = 4.7-10 3) and Amax = 276nm (e = 6.1-10®). 
  Reference    (Z. Naturforsch. 31a, 297—301 [1976]; received January 22 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0297.pdf 
 Identifier    ZNA-1976-31a-0297 
 Volume    31 
54Author    Fred FischerRequires cookie*
 Title    Critical Splay-Bend Deformation of Nematic Films  
 Abstract    In thin nematic films the director field n may only depend on z, the normal to the film plane. There are two stable configurations with less than all three types of deformation present, the pure twist and the pure splay-bend. For the pure twist under the additional influence of an external field normal to the twist plane the range of stability is well known already. For the pure splay-bend the critical equation is derived here under the additional influence of an external field normal to the splay-bend plane. It comes out as an eigenvalue problem which can be solved using Ritz' method. Numerical solutions are presented for Kt=K3 . 
  Reference    (Z. Naturforsch. 31a, 302—305 [1976]; received February 28 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0302.pdf 
 Identifier    ZNA-1976-31a-0302 
 Volume    31 
55Author    H.-J Hennig, H. LechertRequires cookie*
 Title    Temperaturabhängigkeit des kernmagnetischen Relaxationsverhaltens von Wasserprotonen in nativer Stärke  
 Abstract    The Temperatur Behaviour of the Transverse Relaxation of the Protons of Water Molecules in Native Starch Measurements of the temperature behaviour of the transverse relaxation of the protons of water molecules in native potatoe starch show two sorption states and an exchange of protons between these states. From model calculations of Woessner and Zimmermann the occupation of the states and the exchange rate can be evaluated. The portion of more tightly bound water molecules comes out to be about 17%. The energy of activation of the exchange decreases with increasing water content and lies with values in the range of 26 to 31 kj/mol distinctly below the values observed usually for proton-exchange processes in similar systems. Wie die Ergebnisse von thermodvnamiscben und NMR-Messungen zeigen, ist die Wasserbindung an native Kartoffelstärke nicht einheitlich. Bei Wasser-gehalten oberhalb von etwa 20 Gewichts-% der Ge-samtmasse liegen die Wassermolekeln in minde-stens zwei Sorptionszuständen vor. Schierbaum et al. 1> 2 haben aus der Analyse von Isothermen und Sorptionswärmen gefolgert, daß oberhalb des ge-nannten Wassergehaltes sogenanntes Kapillarwasser auftritt. Auch Das et al. 3 ' 4 haben die Form der Iso-thermen durch Annahme von Wasser in Kapillaren gedeutet und den Porenradius zu 74,5 Ä ermittelt. Das Abklingen der Magnetisierungen bei impuls-spektrometrischen NMR-Messungen 5 läßt sich in zwei Komponenten zerlegen, die Wassermolekeln unterschiedlicher Beweglichkeit entsprechen. Die Komponente mit der größeren Beweglichkeit könnte dem Kapillarwasser zugeordnet werden, obwohl das Relaxationsverhalten dieses "Wassers" sehr stark von dem des reinen Wassers abweicht. Die Anteile der Komponenten an den Magnetisie-rungen sind proportional zu den Besetzungszahlen in den dazugehörigen Bereichen, wenn der Austauscht der Protonen oder Wassermolekeln zwischen diesen Bereichen hinreichend langsam abläuft. Ob und in welchem Umfange ein Austausch vorliegt, läßt sich aus der Temperaturabhängigkeit der Relaxations-zeiten und der Anteile der einzelnen Magnetisie-rungsabfälle erschließen. Nach Arbeiten von Woess-ner und Zimmermann 6 sollten sich gegebenenfalls Aufenthaltswahrscheinlichkeiten, Austauschraten und Aktivierungsenergien bestimmen lassen. In der vor-liegenden Arbeit wurde durch Analyse der Tempera-turabhängigkeit der transversalen Relaxation das dahingehende Verhalten von an Kartoffelstärke ad-sorbierten Wassermolekeln studiert. Experimenteller Teil 
  Reference    (Z. Naturforsch. 31a, 306—309 [1976]; eingegangen am 13. Februar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0306.pdf 
 Identifier    ZNA-1976-31a-0306 
 Volume    31 
56Author    D. Einfeld, G. SauerbreyRequires cookie*
 Title    Bestimmung der Elektronenanzahldichte in einem Helium-Plasma  
 Abstract    Determination of the Electron Density in a Helium Plasma A comparison was made between electron densities determined from the emission coefficient of the continuum radiation and from Stark broadening of line profiles using a wall stabilized pulsed arc plasma with electron temperature 7 = 38 000 K and electron density from 2 x 10 22 m~ 3 to 3.5 x 10 22 m -3 . The measured peak separation in the profiles of the He I lines 447.1 nm and 492.2 nm was consistent with that predicted by G.B.K.O.-and B.C.S.-theory and agrees with the experimental results from Bötticher, Roder, and Wobig. The measured halfwidth of the He I 501.6 nm line agrees with the results from Kusch and shows a discrepancy to the G.B.K.O.-theory by a factor about 1.7. The results for the Stark broadening halfwidth of the He II lines 468.6 nm and 320.3 nm lie between the values from G.K.S.-and K.G.-theory. 
  Reference    (Z. Naturforsch. 31a, 310 [1976]; eingegangen am 27. November 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0310.pdf 
 Identifier    ZNA-1976-31a-0310 
 Volume    31 
57Author    H. Schmidt, K. GüttnerRequires cookie*
 Title    Computersimulation der Rückstreuung schneller schwerer Ionen an einkristallinen (001)-und (lll)-Goldoberflächen  
 Abstract    A computer program for following the trajectories of high energy ions in an fcc-lattice has been written to evaluate the reflection rate of high energy ions with grazing incidence to (001)- and (111)-Au-surfaces. The calculation yields a rapid decrease of the reflection rate for penetration directions close to low-index atomic planes. It can be shown that this result is caused by channeling of the ions between the atomic planes. 
  Reference    (Z. Naturforsch. 31a, 316—326 [1976]; eingegangen am 16. Februar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0316.pdf 
 Identifier    ZNA-1976-31a-0316 
 Volume    31 
58Author    T. Morović, W. GreinerRequires cookie*
 Title    Heavy-Ion Real Potentials for Collisions of Identical Nuclei  
 Abstract    An improved two-center model has been used to describe the elastic scattering potentials for the collision of identical nuclei. The macroscopic-microscopic approach includes liquid drop (LD) deformation energies, shell corrections and pairing energy corrections. As basis for the microscopic part a two-center shell model has been used with a Hamiltonian including a Thomas-type spin-orbit potential and an correction term. The model is applied to the sudden and adiabatic type of scattering process, including a compression energy term in the LD part for the former case. Results are given as potential energy surfaces for the adiabatic scattering process and potential energy curves for the sudden scattering process. 
  Reference    (Z. Naturforsch. 31a, 327—343 [1976]; received January 26 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0327.pdf 
 Identifier    ZNA-1976-31a-0327 
 Volume    31 
59Author    H. G. MüllerRequires cookie*
 Title    LCAO — Interpolationsmodell für die Aufspaltung der Valenzbandkante von Germanium im Magnetfeld  
 Abstract    LCAO Interpolation Model for the Splitting of the Valence Band of Germanium in a Magnetic Field In a previous paper the application of the LCAO interpolation method to crystal electrons in homogeneous magnetic fields of moderate strength has been described. In the present paper this method is tested for a crystal type which is of general interest. A simple model of the valence band of Germanium is constructed and the highest energy levels are calculated. The magnetic field is assumed in [001] direction. The results can be compared with the Luttinger-Kohn results. I. Einleitung In einem voraufgegangenen Artikel 1 , im folgen-den mit A bezeichnet, wurde die LCAO-Interpola-tionsmethode, die auf Slater und Koster 2 zurückzu-führen ist, auf Kristallelektronen im Magnetfeld übertragen. Dabei werden die Matrixelemente der LCAO-Methode als anpaßbare Parameter betrachtet, die die Symmetrie der Punktgruppe des Materials enthalten, und es wird die Translationssymmetrie des Kristalls im Magnetfeld exakt berücksichtigt. Man erhält ein Differenzengleichungssystem, aus dessen Untersuchung sich die Eigenwerte ergeben. Hier soll dieses Verfahren in der Anwendung für ein bestimmtes Kristallgitter untersucht werden. Da-bei soll mit Hilfe eines möglichst einfachen Modells die Aufspaltung des Valenzbandes von Halbleitern mit Diamantstruktur, insbesondere von Germanium, berechnet werden. Germanium gehört sicherlich zu den Halbleitern, über die es die detailliertesten ex-perimentellen Untersuchungen und sehr viele theo-retische Untersuchungen und Berechnungen gibt. Insbesondere wurde für die Berechnung der Auf-spaltung des Valenzbandes von Germanium im homogenen Magnetfeld eine Lösungsmethode von Luttinger und Kohn 3 und Luttinger 4 vorgeschla-gen. Mit den Ergebnissen dieser Methode können also die Ergebnisse, die man mit der hier vorge-schlagenen Methode erhält, verglichen werden. 
  Reference    (Z. Naturforsch. 31a, 344—350 [1976]; eingegangen am 16. Februar 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0344.pdf 
 Identifier    ZNA-1976-31a-0344 
 Volume    31 
60Author    W. D. Kautt, H. Krüger, 0. Lutz, H. Maier, A. NolleRequires cookie*
 Title    Fourier Transform NMR Studies of 95 Mo and 97 Mo  
 Abstract    95 Mo and 97 Mo Fourier transform NMR studies of several alkali molybdate solutions in H20 and D20 are reported. The Larmor frequency of the molybdenum nuclides is remarkably dependent on the solute and the solvent. In potassium molybdate the chemical shifts of 39 K were observed. The ratio of the Larmor fre-quencies of 95 Mo and 39 K was measured with high accuracy in a 2.6 molal solution of K2Mo04 in H20. From this value a nuclear magnetic moment of 95 Mo and 97 Mo in the molybdate ion was derived using the concentration dependencies of the Larmor frequencies of 39 K and 95 Mo and the ratio of the Larmor frequencies of 97 Mo and 95 Mo. In solid Ag2Mo04 and metallic molybdenum the 95 Mo and 97 Mo NMR signals were detected; line widths and shifts are given. 
  Reference    (Z. Naturforsch. 31a, 351—356 [1976]; received February 28 1976) 
  Published    1976 
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 TEI-XML for    default:Reihe_A/31/ZNA-1976-31a-0351.pdf 
 Identifier    ZNA-1976-31a-0351 
 Volume    31 
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