bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ultraschall-Geschwindigkeit und-Absorption in Bi-In-Schmelzen /Ultrasonic Velocity and Absorption in Bi-In-melts
Authors: Bek R. , Steeb S. 
Published: February 2015

Abstract
Using the pulse-echo method the ultrasonic velocity and absorption was measured with Bi-In-melts in the temperature range from liquidus up to more than 600 °C. The frequencies used reached from 10 MHz up to 130 MHz. Within the experimental accuracy no frequency dependence of the absorption coefficient α/f2 could be detected. An excess absorption can be observed, which for the molten elements can be explained by fluctuations of the packing density. For the molten alloys additionally concentration fluctuations play an important role. Thus an understanding of the temperature dependency of the ultrasonic velocity and absorption can be achieved.
X-Ray and Neutron Diffraction Studies on Amorphous Transitionmetal—Boron Alloys (Fe-B,Co-B,Ni-B)
Authors: Lamparter P. , Nold E. , Rainer-Harbach G. , Grallath E. , Steeb S. 
Published: February 2015

The atomic-scale structure of the amorphous metallic alloys Fe80B20, Co81·5B18·5, and Ni81·5B18·5 was investigated by X-ray- and neutron-diffraction covering a wide range of the ratio (fmetal/fboron) of the scattering factors of both components. The structure factors S (q) show a pronounced dependence on the ratio fmetal/fboron . In the cases of a small ratio an additional peak near q = 21.5 nm-1 appears in the structure factors from which a definite distance between B-B atoms, which are separated by metal atoms, is deduced. The corresponding structure factors show only weak oscillations in the range of the second and third maxima, which are followed by increased amplitudes at larger q's.
By Fourier-transformation radial distribution curves were evaluated, from which the distances between the metal-metal-, the metal-boron-, and the boron-boron-atoms and the coordination numbers are extracted. From the splitted first maximum of the radial distribution function in the cases of small ratio fmetal/fboron also partial coordination numbers could be obtained. The results suggest some kind of short range order between the metal and the boron atoms.
The Temperature Dependence of the Viscosity of Suspensions of Polystyrene Latices in LiCl Solutions
Authors: Bonincontro A. , Cametti C. , Di Biasio A. 
Published: February 2015

The viscosities of suspensions of polystyrene particles in aqueous LiCl solutions (about 3.5 · 10-4 M) at temperatures from 0 to 60 °C were measured and fitted to relations of the form η = η0(1+K1ϕ+K2ϕ2)i where ϕ is the volume fraction of the particles.
In contradiction to existing theories the coefficients K1 and K2 were found to be temperature dependent
O Functional Quantum Mechanics and the Equivalence with a Product of Schrödinger Problems
Authors: Wahl F. , Feist W. 
Published: February 2015

Abstract
The New Tamm-Dancoff procedure consists of three main parts: an expansion for pairs of states with respect to a non-orthogonal base, a cut-off approximation for this expansion, and a transformation with respect to a new reference state. In this paper we treat part one and two. It is shown that the NTD-procedure is equivalent to the tensor product of the original Schrödinger problem and its conjugate problem. The occurring nonlinear transformation is examined and the cut-off is discussed.
Messung des Chapman-Jouguet-Druckes mit Röntgen-Absorption
Authors: Hollenberg K. , Kleinhanß H.-R. , Reiling G. 
Published: February 2015

Abstract
The Chapman Jouguet pressure of some high explosives is measured by X-ray absorption giving the density behind the detonation front. An accuracy of 2 - 3% was achieved in the pressure range of 200 kbar. The pressures are considerably lower than comparable results of other authors obtained by the free surface velocity method or similar techniques.
A ALow-Energy Direct Channel Regge-pole Approach to α-C12Elastic Scattering .I
Authors: Majumdar D. , Chowdhury A. Roy , Roy T. 
Published: February 2015

Abstract
Differential scattering cross-sections for the elastic scattering of α by C12 at laboratory bombarding energies from 11.0 to 16.0 MeV have been evaluated in the direct channel Regge-pole formalism, taking into account the contributions from a few nearby dominant excited levels of the compound nucleus O16 and incorporating the background effect. The relevant pole-parameters have also been predicted.
Gleichzeitige Bestimmung von Parametern der Ionosphären-D-Region beim Vorliegen eines negativen Höhengradienten der Elektronenkonzentration
Authors: Muschler W. 
Published: February 2015

Abstract
Preceding papers were concerned with the principles of a wave propagation experiment, which appeared suitable for a simultaneous determination of electron concentration Ne and electron collision frequency v in a magnetoplasma. The complex wave polarization was used being defined by field strength ratios. In former model calculations the electron concentration profile was characterized by exclusively positive height gradients. In this paper considerations are extended to an electron concentration profile with gradient inversion. Calculations on error propagation and wave damping and an estimation of the coupling parameter do not lead to new or serious restrictions in the question of the applicability of the method.
Resonant Interaction of Surface Plasmons with a Dye Monolayer
Authors: Wahling G. 
Published: February 2015

Abstract
Surface plasmons on silver films covered with organic monolayers (dye molecules (S 120) deposited on cadmium arachidate Scheibe or ϳ aggregate) are studied in detail. The optical properties of this system derived from reflection measurements can be described by a rather simple one electron oscillator model. The damping of its eigenfrequency is rather small due to the regular arrangement of the dye molecules. ATR measurements showed a strong influence of this narrow resonance on the dispersion relation of surface plasmons. These observations can be well described by the dielectric function derived from the reflection measurements. The dye molecules are deposited on a cadmium arachidate film of 27 Å thickness. In the case of more than one cadmium arachidate space layer between dye and metal the agreement of observed data with those calculated using the oscillator constants gets worse. This is explained by the decreasing order of the dye molecules in the ^'-aggregates with increasing number of space layers
The Molecular Structure of Benzotrifluoride as Studied by Gas Electron Diffraction
Authors: Schultz György , Hargittai Istvan , Seip Ragnhild 
Published: February 2015

Abstract
The molecular structure of benzotrifluoride has been studied by electron diffraction. The geometry of the carbon ring is essentially regular hexagonal. The bond configuration of the trifluoromethyl group considerably departs from the regular tetrahedral arrangement. The following values were obtained for bond lengths (rg) and bond angles: r(C-C)ring- 139.7 ±0.3 pm (mean value), r(Cmethyl-Cphenyl) = 150.4 ± 0.4 pm, r(C-F) = 134.5 ±0.3 pm, r(C-H) = 109.9 ± 0.5 pm and ∢ C-C-F = 111.9 ± 0.1°. The electron diffraction data are in agreement with nearly free rotation of the -CF3 group around the Cmethyi-Cphenyi axis
A Note on the Throbbing of Glow Discharges in Gases at Low Pressures
Authors: Chaudhri Rafi M. , Zahra Tasneem , Chaudhri M. Munawar 
Published: February 2015

Abstract
The influence of acyclic conjugated branches on the π-electron energy and energy gaps of infinite polymers containing benzene rings is studied applying a graph-theoretical extrapolation scheme. It is found that methylene branches strongly reduce the energy gap of the unmodified polymers.
Dynamical Jahn-Teller Systems: Internal Energy Resonance Structures of Isolated Jahn-Teller Molecules (E-b and T-t System)
Authors: Sigmund E. , Brühl S. 
Published: February 2015

Abstract
The internal energetic transfer processes of an E - b and T - t Jahn-Teller system are con­ sidered. The first system allows an exact description, whereas in the case of the second one ap­ proximations must be introduced in the region of intermediate electron-phonon coupling strengths. The occupation probabilities of the states of the uncoupled systems change with time by virtue of the electron-phonon interaction. The energies are directly related to these occupation probabilities. The resonant nature of the T - t system is reflected in the internal dynamics of the latter.
Voltage-Induced Cholesteric Structure-Transformation in Thin Layers
Authors: Gerber Paul R. 
Published: February 2015

Abstract
o lta g e -In d u c e d C h o le s te r ic S tr u c tu r e -T r a n s f o r m a tio n in T h i n L a y e rs Measurements of various threshold voltages which occur in thin layers of cholesteric liquid crystals with positive dielectric anisotropy under homeotropic wall-alignment conditions are presented. Characteristic times are determined for some of the structure-changing processes which take place under application of electric-field changes. The measurements have been performed for various pitch-to-thickness ratios, and are expressed in empirical formulae.
On the Ground State of H-
Authors: Gupta Uday Vanu Das , Saha Subal Chandra , Sengupta Sankar 
Published: February 2015

Abstract
A simple and effective method is described to calculate the ground state energy of H~ starting with the Hartree Fock wavefunction. The expectation values of the opera­ tors 〈r1 • r2〉, 〈r1
n + r2
n〉 and 〈p1 • p2〉 can be estimated easily with the present procedure. Oscillator strength sums S(k) for k= -1,0, 1 are also evaluated.
Collision Broadening and Shift of the 535.0 nm Tl Line Accompanying the Photodissociation of Thallium Iodide Perturbed by Noble Gases Part II: Effects due to He, Ne and Ar
Authors: Lisicki E. , Bielski A. , Szudy J. 
Published: February 2015

Abstract
The broadening and shift of the 535.0 nm thallium line resulting from the photodissociation of thallium iodide perturbed by helium, neon and argon were investigated at low densities using a photoelectric Fabry-Perot interferometer. The Doppler and collision broadening components of the line profiles have been determined. Linear variations of both the Lorentzian half-width and the shift of the line with the perturbing gas density were found and interpreted in terms of Van der Waals and Lennard-Jones potentials.
The Instability of Molecules in Laser Field and Isotope Separation
Authors: Li Ke-hsueh 
Published: February 2015

Abstract
In the present paper the nonlinear differential equation describing the selective decomposition of a molecule as an unimolecular reaction has be deduced from the usual time dependent semi-classical Schroedinger Equation. The selective conditions for the instability of a molecule are discussed. The thresholds of the required laser intensities for ICl and HCl diatomic molecules are estimated respectively, where one type of isotope molecules ought to be decomposed for hundred per cent in a laser pulse for different pulse widths. And possibly selective decomposition of the molecule without permanent dipole moment by Raman process is also discussed briefly.
Intramolecular Electron Transfer in Nonconjugated Polyenes
Authors: Böhm Michael C. 
Published: February 2015

Abstract
The probability of hole-propagation of initially prepared vacancies in 1,5-hexadiene (1) and 1,6-heptadiene (2) as well as the transfer mechanisms in 1 and 2 are studied by means of timedependent perturbation theory. Times of equibrilation of about 10-15 sec are calculated. Local perturbations in the π moieties are efficiently transmitted via CH-σ states while CC-σ functions and the direct transfer channel are less important. The theoretical key step consist in an unitary transformation of the canonical molecular orbitals (CMO's) with the diagonal Fock operator into a set of one-electron states forming a transport-type Fockian, FHT, where only a few matrix elements (between the evoluting orbitals and a set of messenger states) differ from zero.
The Role of Polarizabilities in the Fluorescence Behaviour of 4-cyano-N,N-dimethylaniline
Authors: Baumann Wolfram 
Published: February 2015

Abstract
The effect of an external electric field on the absorption and the double fluorescence of 4-cyano-N,N-dimethylaniline can be understood, taking into account reaction field induced polarizability effects. If a TICT state conformation emits the a-fiuorescence in dioxane, the permanent dipole moment in this state is only slightly larger than in the equilibrium ground state.
Structure Investigations on Se1-xTex Melts by Neutron Scattering and X-ray Diffraction
Authors: Hoyer W. , Kunsch B. , Suda M. , Wieser E. 
Published: February 2015

Abstract
Neutron scattering results on Se1-xTex melts (x = 0.3, 0.6, 0.8) obtained at 460 °C are combined with earlier X-ray diffraction data. The behaviour of the number and distance of nearest neighbours is discussed with respect to chemical short-range order and transition from twofold to three-fold coordination. For Se70Te30 the radial concentration correlation function 4πr2 ρcc(r) has been evaluated. It shows clearly the preferred formation of unlike pairs (Se-Te) within the chains.
X-ray Three Beam Cases and the Influence of Lattice Defects
Authors: Scherz W. , Hildebrandt G. 
Published: February 2015

Abstract
The three beam cases {111, 1̅11; 200} (Case I) and {1̅1̅1, III; 220} (Case II) in germanium were examined with CuKα1 radiation from a bent quartz monochromator crystal. For the intensity relation I0/(IL + IM), excellent agreement with previous measurements (Uebach) resulted for Case I; small deviations from a calculated value could be explained by theoretical arguments, considering the crystal as slightly imperfect. In Case II, which reacted more sensitively upon lattice defects, these deviations were much larger and in an unexpected direction. A first attempt of a "Three Beam Lang Topography" is reported.
On the Order-Disorder Phase Transformation of Anilinium Halides. III.
Authors: Fecher Gerhard , Weiss Alarich , Joswig Werner , Fuess Hartmut 
Published: February 2015

Abstract
The crystal structure of the high temperature phase of anilinium bromide, C6H5NH3
⊕Br⊖ , was studied by X-ray and neutron diffraction at T = 343 K. The refinement supports disordered positions of the -NH3
⊕ group. A split-atom model is proposed which includes disorder of the benzene ring. The thermal parameters, hydrogen bond distances, and other experimental data (NMR, NQR, inelastic neutron scattering) are in accordance with this model.
Molecular Constants of Some Alkali Metal Halide Dimers by Kinetic Constants Method
Authors: Manivannan G. , Sengodan V. , Srinivasacharya K. G. 
Published: February 2015

Abstract
The kinetic constants method is employed to obtain a fresh set of potential constants in the case of nine X2Y2 type (D2h symmetry) alkali metal halide dimers. The mean amplitudes of vibration, Coriolis coupling constants, Centrifugal distortion constants and thermodynamic functions are evaluated with the presently obtained potential constants. The results are briefly discussed.
An ESR Study on Oxygen Adsorption and Illumination of Vacuum Treated V2O5/TiO2
Authors: Serwicka E. , Schindler R. N. 
Published: February 2015

Abstract
Oxygen adsorption on vacuum treated TiO2 doped with vanadium results in the formation of O2- species. It is argued that substitutional V3+ ions act as electron donors. The oxygen radicals are stabilized in the neighbourhood of titanium ions. Depending on the oxygen pressure photo-adsorption or photodesorption of oxygen is observed.
The Conformation of trans Benzylidene Aniline from the PCILO and CNDO/S Methods: Role of the three Relevant Bond Lengths —N=CH—
Authors: Jacques Patrice 
Published: February 2015

Abstract
The conformation of trans benzylidene aniline (BA) was investigated, using the PCILO and CNDO/S methods. On the basis of a recent gas phase structure determination, the PCILO method proved very efficient when the valence and dihedral angles were optimized. Moreover, the CNDO/S method establishes clearly the non planarity of BA and gives a quite satisfactory inter-pretation of the UV spectra when appropriate bond lengths are choosen for the -N=CH- skeleton.
Proof of Renormalizability and Derivation of Dynamical Equations for Relativistic Composite Particle Systems and Reactions in Unified Field Models
Authors: Stumpf H. 
Published: February 2015

Abstract
In any quantum field theory of matter, in particular in quark-and subquark models, bound states have to be treated. In coupling theories corresponding bound state equations are derived by the Gell-Mann-Low procedure from the Greenfunction hierarchy. Due to certain presupposi-tions neither the derivation of such generalized Bethe-Salpeter equations nor the normalization of their amplitudes are selfconsistent. In this paper bound state equations and general reaction equations for composite particles are derived by means of functional techniques which do not rest on such presuppositions. The derivation is performed for a unified lepton-quark model with boson fusion from fermions, which is described by a nonlinear spinorfield equation with higher order derivatives. Besides the removal of infinities, in coupling theories renormalization mainly means the introduction of dressed field operators which allow a biunique map between field opera-tors and particles. For composite particles renormalization means the dressing of the composite systems which must allow the unique identification of dressed composite particle states independently of the interactions which can take place with other composite systems, i.e. this is in principle the same program as in coupling theories but with the treatment of dressed composite particles instead of dressed field operators. The program is performed for the reaction equations mentioned above.
Properties of a One-Dimensional Coulomb Gas
Authors: Heffernan Daniel M. , Liboff Richard L. 
Published: February 2015

Abstract
The BBKGY equations for N identical, impenetrable, charged particles which move in one dimension and lie in a charge neutralizing background, are shown to separate into N uncoupled equations for the sequence of N reduced distributions. The potential relevant to any subgroup of s adjoining particles is that of an «-dimensional harmonic oscillator whose frequency is the plasma frequency of the aggregate. The «-particle spatial equilibrium distribution reveals that particle vibrations remain centered about fixed, uniformly distributed sites as σ/T goes from zero to infinity, where σ is particle density and T is temperature. Thus it is concluded that the system suffers no change in phase for all σ and T.
Solitary Waves Propagating Along a Magnetic Field in a Warm Collisionless Plasma
Authors: Shivamoggi Bhimsen K. 
Published: February 2015

Abstract
A study is made of solitary waves propagating along a constant, uniform magnetic field in a warm collisionless plasma. The calculation is based on a two-fluid model of the plasma. It is found that the effect of the thermal motion of ions and electrons is to reduce the amplitude but enhance the velocity of propagation of the solitary wave.
A 133Cs-NMR Study of the Chemical Bonding of the Solid Compound Semiconductor Cs3Sb
Authors: Dupree R. , Kirby D. J. , Freyland W. 
Published: February 2015

Abstract

133Cs nuclear magnetic resonance has been studied in the solid compound semiconductor Cs3Sb between room temperature and the melting point. From the magnitude of the chemical shift (620±25 ppm at 300 K) and the quadrupolar coupling constant {e2 qQ/h = 105 ± 3 kHz) we conclude that predominantly ionic bonding does not occur in this semiconductor.
Explicit Liapunov Functions for a Class of Dissipative Systems with Circulatory Forces
Authors: Tasso H. 
Published: February 2015

Abstract
A class of dissipative systems with circulatory forces is given for which a necessary and sufficient condition for stability can be expressed as an explicit Liapunov function equivalent to the Hermitian form of a Hermitian matrix. For a discretized continuous system this matrix has a band structure.
Molecular Orbital Theory of the Electronic Structure of Organic Compounds IV. A CNDO/S-CI SCF MO Study on the Lower Electronic States of Large Molecules. Singlet-triplet Transitions of Dioxodiazacycloalkanes
Authors: Grinberg Horacio , Marañon Julio , Sorarrain Oscar M. 
Published: February 2015

Abstract
The semiempirical molecular orbital CNDO/S-CI spectral parameterization has been used to elucidate the lower triplet electronic states of a series of dioxodiazacycloalkanes. The 1 3 B2(n0π*) and 1 3 A2 (n0π*) triplet spectroscopic states involve intramolecular charge transfer from the oxygen to the carbon atom of the carbonyl group, which is supported by electron density calculations of these excited states. The solvation energy was incorporated in the calculations.
Condensed Aromatics. Part XV. Chrysene
Authors: Cyvin B. N. , Klaeboe P. , Whitmer J. C. , Cyvin S. J. 
Published: February 2015

Abstract
The in-plane and out-of-plane molecular vibrations of chrysene are analysed. Complete sets of independent symmetry coordinates are constructed. The in-plane vibrational frequencies are calculated both by the simple five-parameter approximation and the method of Califano with collaborators. They show a satisfactory agreement with observed values. Calculated frequencies for the out-of-plane vibrations were obtained from a five-parameter approximation. Mean ampli-tudes of vibration are discussed, and selected values reported. Spectra of chrysene were recorded in Raman and infrared. An almost complete assignment of observed fundamentals was achieved with the aid of the calculated frequencies.
Experimentelle und Quantenchemische Untersuchungen der Dipolmomente von Donator-substituierten 4-Isocyanat-trans- Stilbenen im nichtrelaxierten angeregten Singulettzustand
Authors: Gryczyński I. , Kawski A. , Jung Ch. , Janić I. 
Published: February 2015

Abstract
The electric dipole moments of 4-isocyanate-4′-dimethyl-amino-trans-stilbene(I), 4-isocyanate- 4′-methoxy-trans-stilbene(II) and 4-isocyanate-3′,4′-dimethoxy-trans-stilbene(III) in the relaxationless first excited singlet state (μe) have been determined from the solvent effect and compared with the values calculated with the quantum chemical Parisser-Parr-Pople method.
A Firmly Localized Hole Center in the Mineral Brazilianite NaAl3(PO4)2(OH)4
Authors: Requardt A. , Hill F. , Lehmann G. 
Published: February 2015

Abstract
A hole center on an oxygen adjacent to one aluminum and one phosphorous was detected and analyzed in natural and X-ray irradiated brazilianite. The slightly anisotropic 27 Al shfs splitting is larger than in many other hole centers in which the Al is a lower valency impurity ion with only a coordinative bond to an oxygen lone pair. The hole is trapped at an oxygen with particularly long bond distances to one P and two Al. Thus one structural Al must be substituted by a presumably divalent cation of yet unknown nature. No optical absorption is associated with this center, therefore the large distortion of the coordination polyhedra must be responsible for absence of a light-induced hole transfer between different oxygen ions. Comparison with other systems suggests that the energy differences for other configurations of the hole center are also too high to allow thermal hopping of the hole at or below room temperature. Possible mechanisms for formation and destruction of this center are deduced from experimental results.