Go toArchive
Browse byFacets
Bookbag ( 0 )
Facet   Publication Year 1994  [X]
Results  623 Items
Sorted by   
Section
Publication Year
1994[X]
121Author    Igor NovakRequires cookie*
 Title    Isonumeric Compounds: Derivative Enumeration  
 Abstract    The basic expressions governing derivative enumeration are given and a sufficient condition proposed which applies to isonumeric compounds. 
  Reference    Z. Naturforsch. 49a, 790—792 (1994); received April 16 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0790.pdf 
 Identifier    ZNA-1994-49a-0790 
 Volume    49 
122Author    Ryuzi Katoh, Klaus Lacmann, WernerF. SchmidtRequires cookie*
 Title    Photoionization of C60 and C 70 in Liquid Alkanes  
 Abstract    Single photon ionization of C60 in 2,2-dimethylpropane (neopentane, NP), 2,2,4,4-tetramethyl-pentane (TMP), 2,2-dimethylbutane (neohexane, DMB), and 2,2,4-trimethylpentane (isooctane, iso-OCT), and of C70 in TMP was studied by photoconductivity measurement. Threshold energies of the photoconductivity were determined. From these results, the polarization energies and the ionic radii of the cations were obtained by application of Born's formula. The ionic radii turned out to be smaller than the van der Waals radii of the molecules. 
  Reference    Z. Naturforsch. 49a, 793—796 (1994); received May 2 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0793.pdf 
 Identifier    ZNA-1994-49a-0793 
 Volume    49 
123Author    Pornthep Sompornpisut, Sirirat Kokpol, BerndM. RodeRequires cookie*
 Title    Chloride Ion in Liquid Hydroxylamine: Pair Potential Function and Monte Carlo Simulation  
 Abstract    An analytical pair potential function for the C l--N H 2OH interaction energy surface has been constructed based on basis set superposition error corrected ECP/DZP ab initio calculations. The potential has been tested by Monte Carlo simulation of a solution of one chloride ion in liquid hydroxylamine at 32 °C, leading to the conclusion that under these conditions Cl-forms a solvation shell of eight solvent molecules, coordinated via OH hydrogens. 
  Reference    Z. Naturforsch. 49a, 797—801 (1994); received April 18 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0797.pdf 
 Identifier    ZNA-1994-49a-0797 
 Volume    49 
124Author    M. I. El-Zaiki, H. E. Abdel-BaethRequires cookie*
 Title    The G-Band Systematics of Vibrational and Transitional Nuclei with A = 150 to 166  
 Abstract    The vibrational and rotational characteristics of the ground bands of even-even nuclei with 150 < A < 166 (2 < i?4< 3) are studied. The spectra of these nuclei (with band crossing angular momentum 7C > 12) are analyzed with a cubic polynomial in I. The considered nuclei (150Sm, Gd, 154~156Dy, 156E r,158-16°-162Yb and 162,164, 166Hf) lie in the central region between theZ = 50 and Z = 82 major shell closures and span the spherical to the well deformed region. The gradual shape * transition from a soft spherical vibrator to a deformed rotor from 150Sm to 166Hf is thus made explicitly apparent from the g-band spectrum analysis in terms of the vibrational, rotational and softness coefficients. The transition at N — 88-90 for the vibrational-rotational ratios and for the kinematic moments of inertia are reproduced. 
  Reference    Z. Naturforsch. 49a, 802—810 (1994); received June 7 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0802.pdf 
 Identifier    ZNA-1994-49a-0802 
 Volume    49 
125Author    Yasuhiko Iwadate, Takuma Iida, Kazuko Fukushima, Junichi Mochinaga, Marcelle Gaune-EscardRequires cookie*
 Title    X-Ray Diffraction Study on the Local Structure of Molten ErCl3  
 Abstract    The short range structure of molten ErCl3 at 1053 K was investigated by X-ray diffraction. The nearest neighbour distance of Er3+-Cl~ and the coordination number of C P around Er3+ were estimated to be 2.63 Ä and 5.8 Ä, respectively, and the Er3+-Er3+ and C P -C l-distances 4.05 Ä and 3.75 Ä, respectively. The ratio of the anion-anion pair distance to the cation-anion pair distance (r__/r+_) was, therefore, 1.43, being close to 1.41, characteristic of octahedral geometry. These results indicate that ErClg-octahedra exist in molten ErCl3. Probably Er2Clio and a small amount of ErjCljj-ions are formed according to the geometrical calculations of bond lengths and bond angles. 
  Reference    Z. Naturforsch. 49a, 811—814 (1994); Received 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0811.pdf 
 Identifier    ZNA-1994-49a-0811 
 Volume    49 
126Author    Zoran Marković, Stanimir Konstantinović, Ivan GutmanRequires cookie*
 Title    The Dependence of Vicinal Proton-Proton Coupling Constants on Molecular Structure  
 Abstract    A modification of the Karplus equation is put forward, containing for mutually independent structural terms and four adjustable parameters. Among the new factors introduced in this modifi­ cation are the distance between protons and Muallay's group electronegativity, used in the evalua­ tion of the a-substituent effect. The new equation reproduces experimental NM R vicinal coupling constants with a standard deviation of about 0.6 Hz. 
  Reference    Z. Naturforsch. 49a, 815—818 (1994); received June 3 1993 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0815.pdf 
 Identifier    ZNA-1994-49a-0815 
 Volume    49 
127Author    Enrique Canessa, Wei WangRequires cookie*
 Title    On Biharmonic Fractals Displaying a Structural Transition  
 Abstract    A new class of fractal structures displaying a structural transition on growing is studied by considering the morphology selection mechanism under the biharmonic field V2(V2«) = 0 as recently proposed by the authors [Phys. Rev. E 47, 476 (1993)]. By relating the growth probability for each site to the local ("potential") field as (V2u)'1 , the effects of the surrounding medium and of geometrical constraints for the seed particles are numerically calculated and discussed. A theoretical estimation of the transition point is given anew by solving the biharmonic equation with the boundary conditions used in simulations. 
  Reference    Z. Naturforsch. 49a, 819—823 (1994); received June 13 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0819.pdf 
 Identifier    ZNA-1994-49a-0819 
 Volume    49 
128Author    A. Kawski, G. Piszczek, B. Kukliński, T. NowosielskiRequires cookie*
 Title    Isomerization of Diphenyl Polyenes. Part V III. Absorption and Fluorescence Properties of l-Phenyl-4-diphenylthiophosphinyl Butadiene in Poly (vinyl alcohol) Film  
 Abstract    The effect of temperature (from 296 to 423 K) upon the absorption and fluorescence of l-phenyl-4-diphenylthiophosphinyl butadiene (PDPB) and of the direct irradiation on the absorbance were investigated in poly(vinyl alcohol) film. It was found that for PDPB in PVA film the transition from cis to trans configuration is only possible as a result of thermal isomerization due to the softening of PVA polymer, whereas photoisomerization results in both cis-to-trans and trans-to-cis transitions. Similar as with 1,4-diphenyl-1,3-butadiene in PVA, the luminescence is due to two, trans-trans and cis-trans, PDPB conformers. 
  Reference    Z. Naturforsch. 49a, 824—828 (1994); received June 22 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0824.pdf 
 Identifier    ZNA-1994-49a-0824 
 Volume    49 
129Author    Hubert OtteRequires cookie*
 Title    A very Simple Mass Formula for the Masses of Pseudoscalar Mesons  
 Abstract    The masses of pseudoscalar mesons are approximately proportional to quadratic powers of integers. The masses of pseudoscalar mesons can be approx­ imated by the formula mcal = c x n 2, where the con­ stant c is 122.6 MeV and n is an integer. The value of n is 1 for the two n-mesons, 2 for the three K-mesons and the ^-meson, 3 for the rj' (958)-me-son, 4 for the three D-mesons and the D s-meson, and 5 for the ?7c-meson. For n = 6 one should obtain the mass of the three B-mesons. However the calculated and experimental values do not agree very well. The constant c was adjusted to minimize S ! _ y (M ie x p -W ljc a lV 0c I V * I « P J 
  Reference    Z. Naturforsch. 49a, 829—830 (1994); received January 3 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0829_n.pdf 
 Identifier    ZNA-1994-49a-0829_n 
 Volume    49 
130Author    J. Peinke, B. CastaingRequires cookie*
 Title    On the Relation between Statistics of Scalar and Velocity Fluctuations in Developed Turbulence  
 Abstract    For a developed turbulence it is shown how the statistics of a passive scalar, namely the prob­ ability density function of the temperature, can be related to the velocity intermittency. The results are compared with recent experimental findings on a grid-generated turbulence. 
  Reference    Z. Naturforsch. 49a, 831—834 (1994); received June 21 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0831.pdf 
 Identifier    ZNA-1994-49a-0831 
 Volume    49 
131Author    Gerold Baier, Sven Sahle, Ursula Kummer, Roland BrockRequires cookie*
 Title    Transition to Higher Chaos in Diffusively Coupled Chemical Oscillators  
 Abstract    A one-dimensional array of diffusively coupled identical oscillators is considered. It is demon­ strated that coupling of two, three, four, and six oscillators can create chaos with one, two, three, and four positive Lyapunov characteristic exponents, respectively. We suggest that the turbulent behavior found with many coupled cells can be explained in terms of a high-order chaotic attractor. 
  Reference    Z. Naturforsch. 49a, 835—837 (1994); received May 30 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0835.pdf 
 Identifier    ZNA-1994-49a-0835 
 Volume    49 
132Author    R. Richter1, A. Kittel2, J. Parisi2Requires cookie*
 Title    Time-Averaged Quantity of a Low-Temperature Semiconductor Experiment Reflects Scaling Behavior of Saddle-Node Bifurcation to Chaos  
 Abstract    Low-temperature impact ionization breakdown in p-type germanium crystals gives rise to spon­ taneous oscillations of the current flow. We demonstrate experimental evidence of a particularly high-conducting dynamical state that is limited to a finite parameter regime of the current versus magnetic field characteristic. After bifurcation from a coexisting nonoscillatory state to periodicity, one observes a type-I intermittent transition to chaos and, eventually, a jump back to the nonoscil­ latory branch upon increasing the magnetic field control parameter. The scaling behavior of the underlying saddle-node bifurcation, already found in time-resolved measurements, also becomes visible in a square-root dependence of the time-averaged current developing both prior to and after the critical point. Our result might be of interest for time-averaged information is accessible. 
  Reference    Z. Naturforsch. 49a, 838—842 (1994); received 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0838.pdf 
 Identifier    ZNA-1994-49a-0838 
 Volume    49 
133Author    A. Kittel, J. Parisi, K. Pyragas1, R. Richter2Requires cookie*
 Title    Delayed Feedback Control of Chaos in an Electronic Double-Scroll Oscillator  
 Abstract    We present experimental results on stabilizing unstable periodic orbits of an autonomous chaos oscillator based on a simple electronic circuit. Control is achieved by applying the difference between the actual and a delayed output signal of the oscillator. The quality of chaos control can be measured via the strength of perturbation. The dependence on the delay time shows a characteristic resonance-type behavior. 
  Reference    Z. Naturforsch. 49a, 843—846 (1994); received May 30 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0843.pdf 
 Identifier    ZNA-1994-49a-0843 
 Volume    49 
134Author    Thomas ChristenRequires cookie*
 Title    The Velocity of Current Filaments in Weak Magnetic Fields  
 Abstract    In the presence of a perpendicular weak magnetic field, current filaments in semiconductors can obtain a transverse drift. In the framework of a collective-coordinate ansatz, an expression for the velocity of the filament is derived for a simple type of extrinsic semiconductors. It turns out that the motion is caused by the coupling of the non-uniform Hall angle to the translational Goldstone mode of the current filament. PACS numbers: 72.20.Ht. 
  Reference    Z. Naturforsch. 49a, 847—850 (1994); received May 30 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0847.pdf 
 Identifier    ZNA-1994-49a-0847 
 Volume    49 
135Author    Thomas ChristenRequires cookie*
 Title    Nonequilibrium Phase Transition and Current Filaments in Extrinsic Semiconductors  
 Abstract    A phenomenological model for charge transport in extrinsic semiconductors is presented. For shallow impurities, large saturated impact-ionization coefficient and sufficiently low lattice temper­ ature, the current-field characteristic is S-shaped (SNDC) due to the interplay between impact ionization and scattering of carriers from acoustic phonons, ionized and neutral impurities. The present model provides and explanation of the experimentally observed disappearance of SNDC above a critical lattice temperature. In the region of negative differential conductivity where a current-controlled uniform state is unstable, current filaments are calculated numerically. PACS numbers: 72.20.Ht, 05.70.Ln 
  Reference    Z. Naturforsch. 49a, 851—855 (1994); received May 30 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0851.pdf 
 Identifier    ZNA-1994-49a-0851 
 Volume    49 
136Author    Barbara Drossel, Siegfried Clar, Franz SchwablRequires cookie*
 Title    Universality in the One-Dimensional Self-Organized Critical Forest-Fire Model  
 Abstract    We modify the rules of the self-organized critical forest-fire model in one dimension by allowing the fire to jum p over holes of < k sites. An analytic calculation shows that not only the size distribution of forest clusters but also the size distribution of fires is characterized by the same critical exponent as in the nearest-neighbor model, i.e. the critical behavior of the model is universal. Computer simulations confirm the analytic results. 
  Reference    Z. Naturforsch. 49a, 856—860 (1994); received 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0856.pdf 
 Identifier    ZNA-1994-49a-0856 
 Volume    49 
137Author    Jürgen VollmerRequires cookie*
 Title    The Topological Entropy for an Inclined Billiard in a Gravitational Field  
 Abstract    A new parameterization for an inclined billiard initially discussed by Henon is presented. This parameterization expresses the time evolution of the scattering system by a family of pruned baker transformations. This allows to make contact with recent work on these mappings. As an applica­ tion, the topological entropy is analytically derived in a very good approximation and it is indicated how to systematically improve the result. The result which contains no free parameter, agrees excellently with numerical data for the whole parameter range from strongly chaotic scattering described by a complete symbolic dynamics to a bounded system with trivial scattering behavior. 05.45. + b, 03.20. + i, 05.90. + m 
  Reference    Z. Naturforsch. 49a, 861—870 (1994); received May 30 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0861.pdf 
 Identifier    ZNA-1994-49a-0861 
 Volume    49 
138Author    R. Richter1, C.A K Ruelle1, A. K. Itte, O. E. Rössler3Requires cookie*
 Title    The 'Triptych Fractal' -A New Feature of the Logistic M ap  
 Abstract    The recently introduced path length method for nondissipative systems is generalized to dissipa­ tive systems, specifically, the logistic map. A new prototype fractal is found to underlie the resulting nowhere-differentiable structure ("triptych principle"). 
  Reference    Z. Naturforsch. 49a, 871—873 (1994); received May 30 1994 
  Published    1994 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0871.pdf 
 Identifier    ZNA-1994-49a-0871 
 Volume    49 
139Author    S. M. Ü Lle R1, Chen Shiping3, N. Ie, O. D. Ra, N. D. Ragounová, H. H., E. H. E Ch Tl1, K.-HH. Iddem, A. Špalek2Requires cookie*
 Title    Search for an Admixture of a 17 keV Neutrino in the ß Decay of 35S  
 Abstract    The ß spectrum of a mass-separated thin 35S source has been measured with a small-volume Si photodiode. The energy-dependent response function of the total experimental set-up was calculated by the Monte Carlo method without any adjustable parameter. For an admixture of the hypothetical 17 keV neutrino, an upper limit of 0.59% (95% CL) was determined. Neglecting electron scattering on the spectrometer diaphragm was shown to generate a false 17 keV neutrino admixture of 0.3%. 
  Reference    Z. Naturforsch. 49a, 874—884 (1994); received June 27 1994 
  Published    1994 
  Keywords    Neutrino mass, ß decay, ß spectroscopy, Electron scattering, Electron energy loss 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0874.pdf 
 Identifier    ZNA-1994-49a-0874 
 Volume    49 
140Author    F. SchullerRequires cookie*
 Title    Dispersion Potentials between Atoms and Dielectric Bodies  
 Abstract    We derive a formula for the van der Waals interaction between an atom and a dielectric surface for both ground and excited state potentials. We compare our result with previously derived expressions involving the dielectric constant at purely imaginary frequencies. We also study the relationship between atom-dielectric and ordinary atom-atom van der Waals interaction. 
  Reference    Z. Naturforsch. 49a, 885—889 (1994); received July 6 1994 
  Published    1994 
  Keywords    Van der Waals potentials, Atoms, Dielectrics, Surface physics, Atomic spectroscopy 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0885.pdf 
 Identifier    ZNA-1994-49a-0885 
 Volume    49 
Prev
...
6
7
8
9
10
...
Next