Zeitschrift für Naturforschung A Volume 70 Issue 3

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Frontmatter

2015 Zeitschrift für Naturforschung A

doi:10.1515/zna-2015-frontmatter3

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The Kirchhoff Index of Quasi-Tree Graphs

Xu, Kexiang; Liu, Hongshuang; Das, Kinkar Ch.

2015 Zeitschrift für Naturforschung A

doi:10.1515/zna-2014-0230

AbstractResistance distance was introduced by Klein and Randić as a generalisation of the classical distance. The Kirchhoff index Kf(G) of a graph G is the sum of resistance distances between all unordered pairs of vertices. In this article we characterise the extremal graphs with the maximal...

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Radiative Decay of Light Leptonic Magnetic Monopoles in an Extended Standard Model

Stumpf, Harald

2015 Zeitschrift für Naturforschung A

doi:10.1515/zna-2014-0262

AbstractBased on the theory of Lochak and the experiments of Urutskoiev, it has been suggested by Urutskoiev that, during discharges in water (fluids), light leptonic magnetic monopoles can be created in order to understand accidents in power plants. In previous papers, it was demonstrated that...

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On Polymorphism of Dysprosium Trichloride

Zakirýanova, Irina D.; Khokhlov, Vladimir A.; Salyulev, Alexander B.; Korzun, Iraida V.

2015 Zeitschrift für Naturforschung A

doi:10.1515/zna-2014-0276

AbstractFor the first time, the structure of crystalline DyCl3 over a wide temperature range from room temperature to melting point was studied by Raman spectroscopy. The phonon modes (cm–1) of dysprosium trichloride (monoclinic crystal lattice of AlCl3 type, Z=4, CN = 6) at room temperature are...

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Theoretical Studies of the Local Structure and Electron Paramagnetic Resonance Parameters for Tetragonal VO2+ in C6H7KO7

Zhou, Ping; Li, Ling

2015 Zeitschrift für Naturforschung A

doi:10.1515/zna-2014-0306

AbstractThe optical spectra, electron paramagnetic resonance parameters (i.e., the spin Hamiltonian parameters, including paramagnetic g factors and the hyperfine structure constants Ai) and the local distortion structure for the tetragonal VO2+ in C6H7KO7 are theoretically studied based on the...

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Flow and Heat Transfer of Powell–Eyring Fluid due to an Exponential Stretching Sheet with Heat Flux and Variable Thermal Conductivity

Megahed, Ahmed M.

2015 Zeitschrift für Naturforschung A

doi:10.1515/zna-2014-0310

AbstractAn analysis was carried out to describe the problem of flow and heat transfer of Powell–Eyring fluid in boundary layers on an exponentially stretching continuous permeable surface with an exponential temperature distribution in the presence of heat flux and variable thermal conductivity....

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Nitrogen-Containing Coronenes: Theoretical Evaluation of the Influence of Aza-substitution on their Aromaticity

Pop, Raluca; van Staden, Jacobus; Diudea, Mircea

2015 Zeitschrift für Naturforschung A

doi:10.1515/zna-2014-0318

AbstractThe aromaticity of coronene derivatives where two C atoms of each outer six-membered ring are replaced by N have been investigated. Three types of substitution, namely 1,2-, 1,3-, and 1,4- are proposed. Computations of the geometric (HOMA index), energetic (HOMO-LUMO gap), and magnetic...

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A Model of Solar Radiation and Joule Heating in Flow of Third Grade Nanofluid

Hussain, Tariq; Hayat, Tasawar; Shehzad, Sabir Ali; Alsaedi, Ahmed; Chen, Bin

2015 Zeitschrift für Naturforschung A

doi:10.1515/zna-2014-0267

AbstractThe flow problem resulting from the stretching of a surface with convective conditions in a magnetohydrodynamic nanofluid with solar radiation is examined. Both heat and nanoparticle mass transfer convective conditions are employed. An incompressible third grade fluid which exhibits shear...

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Scattering State of Coupled Hulthen–Woods–Saxon Potentials for the Duffin–Kemmer–Petiau Equation with Pekeris Approximation for the Centrifugal Term

Ikot, Akpan N.; Obong, Hillary P.; Olisa, Joy D.; Hassanabadi, Hassan

2015 Zeitschrift für Naturforschung A

doi:10.1515/zna-2014-0296

AbstractWe studied the approximate analytical scattering state of the Duffin–Kemmer–Petiau (DKP) equation for arbitrary l-state for couple Hulthen–Woods–Saxon potential using the Pekeris approximation for the centrifugal term. We obtained an energy spectrum, normalised radial wave functions of...

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Limit Cycles of Nonlinear Oscillator Equations with Absolute Value by Means of the Homotopy Analysis Method

Cui, Jifeng; Lin, Zhiliang; Zhao, Yinlong

2015 Zeitschrift für Naturforschung A

doi:10.1515/zna-2014-0353

AbstractAn analytic approach based on the homotopy analysis method is proposed to obtain the limit cycles of highly nonlinear oscillating equations with absolute value terms. The non-smoothness of the absolute value terms is handled by means of an iteration approach with Fourier expansion. Two...

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