bluuebunny/crossref_metadata_2025_split huggingface dataset:
NQR Spectrometer with a Two Integrated Circuits Radio Frequency Head
Authors: Zikumaru Yushi 
Published: February 2015

Abstract
An NQR spectrometer has been constructed using two linear integrated circuits in its oscillator-detector. This is very simple and compact and works in range 3-65 MHz. The radio frequency voltage can be varied from 10 mVp-p to 15 V p-p by changing the supply-voltage of an integrated circuit μA 733. The utility of the spectrometer is demonstrated by recording 35Cl NQR spectra in p-C6H4Cl2 , NaClO3 , and KClO3 .
A Low-Temperature High-Sensitivity Field-Cycling Spectrometer for Quadrupole Double Resonance Spectroscopy
Authors: Khurshid M. M. P. , Zhenye F. , Smith J.A.S. 
Published: February 2015

Abstract
This paper discusses the design of a variable-temperature high-sensitivity field cycling spectrometer for nuclear magnetic resonance and nuclear quadrupole double resonance experiments. The instrument is capable of detecting N-14 quadrupole resonance signals from samples as small as 0.1 g down to temperatures of 150 K. The magnetic field cycling is performed by mechanical transfer of the sample using a pair of switchable electromagnetic solenoids, in times of about 0.2 s.
Zeeman NQR Studies on Powdered Bromine Compounds Having Small η
Authors: Ege Osamu , Negita Hisao 
Published: February 2015

Abstract
The Zeeman NQR of 79 Br and 81Br in samples having relatively small r\ was studied on several bromine compounds which were in the powder or polycrystal state. The absorption lines were detected in the integral form by the bridge circuit. When a static magnetic field was applied, the line shapes were broadened and usually two dips appeared symmetrically at both sides of the zero field line. The values of η were estimated from the patterns of the dips. For compounds such as NaBrO3 , however, as expected no dips were observed.
Werner Heisenberg's Ideas on Particle Physics in the Light of Recent Achievements
Authors: Bleuler Konrad 
Published: February 2015

Abstract
Dedicated to Hans-Peter Dürr on the occasion of his 60th birthday W. Heisenberg's unconventional -at his time even revolutionary -ideas on "elementary" particles are reviewed -or, better, rediscovered -within the framework of present day gauge-and string-theories.
Self-Organization in Three-Dimensional Hydrodynamic Turbulence Self-Organization in Three-Dimensional Hydrodynamic Turbulence
Authors: Knorr G. , Lynov J. P. , Pécseli H. L. 
Published: February 2015

Abstract
The three-dimensional incompressible Euler equations are expanded in eigenflows of the curl operator, which represent positive and negative helicity flows in a particularly simple and convenient way. Four different basic types of interactions between eigenflows are found. Two represent an "inverse cascade", the interaction familiar from the two-dimensional Euler equations, in which only modes of the same sign of the helicity interact. The other two interactions mix positive and negative helicity modes. Only these interactions can transport all of the available energy to higher wave numbers. Initial conditions, which lead to the appearance of structures and self-organization, are discussed.
Localized Ideal and Resistive Instabilities in 3-dimensional MHD Equilibria with Closed Field Lines
Authors: Correa-Restrepo Dario 
Published: February 2015

Abstract
A class of stability criteria is derived for MHD equilibria with closed field lines. The destabilizing perturbations have finite gradients along the field and are localized around a field line, the localiza-tion being stronger on the pressure surface than in the radial direction. By contrast, in sheared configurations the localization is comparable in both directions. The derived stability criteria are less stringent than those obtained for MHD equilibria with shear for similarly localized perturbations in the limit of low shear. These results, obtained from the energy principle, are a particular case of those obtained by solving the linearized resistive MHD equations with an appropriate ansatz and subsequently taking the limit of vanishing shear and resistivity.
Topological Studies on Heteroconjugated Molecules. VI. Alternant Systems with Two Heteroatoms
Authors: Gutman Ivan 
Published: February 2015

Abstract
The collective effects of two heteroatoms on the total π-electron energy, resonance energy and charge distribution of alternant conjugated molecules are examined. Three general rules for the signs of these effects are formulated. All these rules are shown to have a common origin and are conse-quences of certain mathematical properties of graph propagators.
Modeling of High-Signal Electrostriction. I
Authors: Cieminski J. von 
Published: February 2015

Abstract
A thermodynamical calculation of high-signal electrostriction, especially of ferroelectric materials, is proposed. It permits to model the high-signal electrostriction of the paraelectric and the funda-mental switching behaviour of the ferroelectric phase. Extraordinary high-signal deformation curves can be explained, the influence of the thermodynamical coefficients can be estimated and the order of phase transitions can be determined experimentally from the high-signal deformation curves.
Investigation of the Microwave Spectrum of Cyclopropyl Isocyanate. An Example for the Failure of Centrifugal Distortion Theory
Authors: Heldmann C. , Dreizler H. 
Published: February 2015

Abstract
The vibrational ground state microwave spectrum of cyclopropyl isocyanate was investigated in the region from 8.4 to 40 GHz by microwave Fourier transform (MWFT) spectroscopy. The quadru-pole hyperfine structure was resolved and assigned. The quadrupole coupling constants are given. With respect to the data given in the literature up to now, this work led to a more profound description of the pure rotational spectrum. Furthermore, some interesting and surprising results concerning the effect of centrifugal distortion are presented. Compared to hitherto existing investi-gations, these results indicate a more complicated conformational behaviour of cyclopropyl iso-cyanate.
The Microwave Spectrum and Dipole Moment of Hexafluoropropanone
Authors: Grabow J.-U. , Heineking N. , Stahl W. 
Published: February 2015

Abstract
We recorded the microwave spectrum of hexafluoropropanone between 7 and 15 GHz using a pulsed molecular beam microwave Fourier transform spectrometer. The rotational constants were determined to be A = 2181.71980(14) MHz, B= 1037.22930(7) MHz, C = 934.89233(8) MHz, the quartic centrifugal distortion constants are D'J= 0.07378 (39) kHz, D'JK = 0.10002(75) kHz, D'K = -0.07269(266) kHz, δ'J = 0.00623(29) kHz and R' 6= 0.00755(12) kHz. Stark effect measurements yielded a dipole moment μ = μb= 0.3949 (18) D
Passage from Einsteinian to Galilean Relativity and Clock Synchrony
Authors: Ghosal S. K. , Nandi K. K. , Chakraborty Papia 
Published: February 2015

Abstract
There is a general belief that under small velocity approximation. Special Relativity goes over into Galilean Relativity. Should this be interpreted exclusively in terms of the kinematical symmetry transformations (Lorentz vs. Galilei) a misconception could easily arise that would stem from overlooking the role of conventionality ingredients of Special Relativity Theory. It is observed that the small velocity approximation cannot alter the convention of distant simultaneity. In order to exemplify this point further, the Lorentz transformations are critically compared, under the same approximation, with two other space time transformations, one of which represents an Einstein world with Galilean synchrony whereas the other describes a Galilean world with Einsteinian synchrony
Substituent Effects on the Luminescence of 2-Substituted 3-Methylquinoxalines in Poly (Vinyl Alcohol) Films*
Authors: Gryczyński Z. , Kawski A. 
Published: February 2015

Abstract
The effect of 2-substitutions (NH2 . O, CH3O, CI. Br) in 3-methylquinoxalines on the fluorescence and phosphorescence band position and intensity at 293 K, and the temperature dependence of their fluorescence and phosphorescence quantum yields were investigated in polyvinyl alcohol) films
X-Ray Diffraction Studies on Ternary MgCl2-KCI-H2O and MgCI2-CsCl-H2O Solutions Saturated with the Corresponding Double Salts
Authors: Waizumi Kenji , Tamura Yusuke , Masuda Hideki , Ohtaki Hitoshi 
Published: February 2015

Abstract
X-ray scattering measurements have been done on aqueous MgCl2-KCl and MgCl2 CsCl solutions saturated with their double salts of MgCl2• KCl • 6 H2O and MgCl2 • KCl • 6 H2O respectively, at 293 K. The Mg2+ ion was found to be coordinated with six water molecules at an Mg-O distance of 209 and 208 pm, respectively, whereas K+ and Cs+ ions were surrounded by both water molecules and chloride ions in the first coordination sphere. The interatomic distance between the alkali cation and the chloride ion was 320 pm and 339 pm for K+ and Cs+ , respectively, and the coordination numbers of K+ and Cs+ with respect to CP were 2.4 and 2.0, respectively. The alkali metal H20 distance and the hydration number of the cation were 277 pm and 3.7, respectively, for K+ and 315 pm and 4.7, respectively, for Cs+ . The structures of the solutions are discussed in connection with the nucleation processes of the salts from the aqueous solutions
Gas Phase Cluster Formation of Sodium Chloride and Water: Monte Carlo Simulations
Authors: Rode Bernd M. 
Published: February 2015

Abstract
Monte Carlo simulations of a system of 200 water and 24 NaCl molecules at 6 different densities in the range from 0.003 g/cm3 to 0.999 g,/cm3 and T = 125 °C and 225 CC were performed to obtain some insight into cluster formation which should precede and determine the formation of aerosol structures and has possibly played some role in prebiotic atmosphere chemistry. Solute hydration occurs already at very low concentrations mainly in the form of hydrated molecules ("contact ion pairs"). At higher densities larger cluster structures are observed, leading rather continuously to the structure of the supersaturated 7.1 M NaCl solution at the same temperature. Radial distribution functions, coordination numbers and particle interaction energies are discussed with respect to the simulation parameters density and temperature
79Br and 127І Nuclear Quadrupole Resonance Investigations of Ortho-Substituted Anilinium Halides, 2-RC6H4NH3
⊕ X⊖ with X = Br, I and R = CI, CN, C2H5, NH2, and NH3
⊕ X⊖
Authors: Hartmann Jutta , Weiss Alarich 
Published: February 2015

Abstract
The 79Br and 127I nuclear quadrupole resonance, NQR, spectra of ortho-substituted anilinium bromides and iodides 2-RC6H4NH3
⊕ X⊖ with X = Br, I and R = CI, CN, C2H5, NH2, and NH3
⊕ X⊖ have been investigated in the temperature range 77 < T/K <420. Phase transitions occur in 2-(C2H5)C6H4NH3
⊕ Br⊖ ½H2O at Tc= 164 K. in 2-(C2H5)C6H4NH3
⊕ I⊖ at Tc = 214 K, in [1,2-C6H4(N(H,D)3)-]2⊕[Br⊖]2 at Tc = 209 K, and in [1,2-C6H4(NH3)2]2⊕[I⊖]2 at Tc = 173 K. The NQR data are discussed and compared with NQR spectra of para-substituted anilinium halides
The Specific Heat of Liquid Metals
Authors: Khanna K. N. , Quayoum Abdul 
Published: February 2015

Abstract
The specific heat of liquid metals is calculated using a fluid of Percus-Yevick plus tail as a reference system together with the Cumming potential in a random-phase approximation. It is shown that the improved semi-empirical hard sphere direct correlation function proposed by Colot et al. leads to a drastic improvement of Cp values over the HS model
Internal Rotation Fine Structure in the Microwave Spectrum of cis-2-Butene
Authors: Meyer Michael , Vormann Kirsten , Dreizler Helmut 
Published: February 2015

Abstract
The rotational spectrum of cis-2-butene has been measured in the range from 5 to 40 GHz with microwave Fourier transform spectroscopy to determine internal rotation and centrifugal distortion parameters
X-Ray and Neutron Diffraction of Amorphous Nickel-Zirconium-Alloys as Prepared in Different Ways
Authors: Schultz L. , Lamparter P. , Steeb S. 
Published: February 2015

Abstract
The structure of amorphous NiχZr100-χ-alloys (Χ= 30, 31, 34, 63.7, and 65), which were produced by melt spinning (MS), mechanical alloying (MA), and sputtering (SP) was studied by X-ray- and neutron diffraction yielding structure factors, pair correlation functions, coordination numbers, atomic distances, and Warren-Cowley chemical short range order parameters. The atomic arrangement within the first coordination sphere is independent of the method of preparation while in the second and higher spheres it differs between the MS- and the MA-alloys on the one side and the SP-specimens on the other side. Thus one understands that some physical properties of the different specimens differ
The Microwave Rotational Spectra of l-Bromo-2,2- Difluoroethylene and the Bromine Nuclear Quadrupole Coupling Tensor
Authors: Oldag F. , Sutter D. H. 
Published: February 2015

Abstract
The first assignment of the vibronic ground state rotational spectra for F2C = CH 79Br and F2C=CH81Br is reported. Only μb-type transitions could be observed. This indicates, that the C F and C Br bond dipole moments are almost equal despite of the large difference in the Pauling electronegativities of the two halogen atoms. The complete quadrupole Br-coupling tensors including their orientation with respect to the molecular principal inertia axes could be determined and are discussed within the Townes-Dailey model. A partial ro restructure is proposed.
Properties of KSCN-rich Molten NaSCN-KSCN Mixtures
Authors: Iwadata Yasuhiko , Mochinaga Junichi , Igarashi Kazuo , Tajiri Koji , Asahina Tadashi , Kosaka Mineo 
Published: February 2015

Abstract
For molten (Na, K)SCN mixtures with more than 50 mol% KSCN the molar volume Vm,electrical conductivity, χ, refractive index n, surface tension γ and heat capacity CP were measured in dependence of composition and temperature, γ exhibited the minimum at ca. 70 mol% KSCN and Cp was 148 JK-1 mol-1 in the range of 413 to 471 K. The electronic polarizabilities of the ions in the molten state were estimated by the semiclassical Clausius-Mossotti equation
Molecular Motion in Solid Tetrabutylammonium Tetrafluoroborate
Authors: Szafranska B. , Kozak A. , Pająk Z. 
Published: February 2015

Abstract
Proton and fluorine NMR second moments and spin-lattice relaxation times for polycrystalline tetrabutylammonium tetrafluoroborate have been measured over a wide range of temperatures at several Larmor frequencies. An analysis of cross-relaxation effects results in a determination of activation parameters for anion and cation reorientations. Three solid phases characterized by different ion dynamics are evidence
Substratum Interpretation of the Quark-Lepton Symmetries in the Planck Aether Model of a Unified Field Theory
Authors: Winterberg F. 
Published: February 2015

Abstract
An attempt is made to explain the observed quark-lepton symmetries in the framework of the recently proposed Planck aether model of a unfied field theory. If the many body lepton wave function can rearrange itself into a vortex-substructure, very much as it has been observed in the fractional quantum Hall effect, all the symmetries can be understood by the quantum numbers of these vortices and their interactions, and all fermions as permitted combinations of those vortices, including the correct number of force-transmitting bosons. The proposed model can also give a value for the mass of the intermediate vector boson. All charges are explained by the quantum mechanical zero point fluctuations of the Planck masses making up the Planck aether
Stokes Modes in Taylor-Couette Geometry
Authors: Gebhardt Thomas , Grossmann Siegfried 
Published: February 2015

Abstract
The eigenvalue problem of the Stokes operator is solved for an incompressible fluid contained between two coaxial cylinders of infinite height. Flow field patterns and spectra of the eigenmodes ("Stokes modes") are offered. Furthermore, in finite dimensional subspaces generated by these Stokes modes, the eigenproblem for the Navier-Stokes operator linearized about the laminar Taylor-Couette flow is studied. Although the spectrum's qualitative features are still correct, we quantitatively obtain wrong results. We trace this back to a Gibbs like phenomenon of higher order derivatives of the flow field as probable source, since the Stokes modes do not reflect the discontinuity arising from different velocities at both cylinders
Deuterium NMR Study of the Solid-Solid Phase Transition in Phenethylammonium Bromide
Authors: Gruwel Marco L. H. , Wasylishen Roderick E. 
Published: February 2015

Abstract
Using 2H NMR, the dynamics of the cation in phenethylammonium bromide were studied in the two solid phases. Line shape and spin-lattice relaxation rate studies of the ammonium headgroups and the adajacent methylene groups indicate the onset of alkyl-chain motion prior to the first order phase transition. In the low-temperature phase the line shape and the spin-lattice relaxation rates of the -ND3 groups are consistent with C3 jumps and an activation energy of 54±4 kJ mol-1. However, in the high-temperature phase the spin-lattice relaxation studies indicate the presence of small-angle diffusion of the -ND3 groups around the C3 symmetry axis. In this phase the -CD2- groups show line shapes typical of large-amplitude two-site jumps occurring at a rate > 107 s-1 . In the low-temperature phase, at temperatures below 295 K, the -CD2
- 2H NMR line shapes indicate that the C - D bonds are essentially static
Wave Function Collapse as a Real Physical Phenomenon Caused by Vacuum Fluctuations Near the Planck Scale
Authors: Winterberg F. 
Published: February 2015

Abstract
It is hypothesized that the collapse of the wave function is a real physical phenomenon caused by vacuum fluctuations near the Planck scale. The hypothesis is suggested by a recently proposed model (Planck aether model) according to which the fundamental kinematic symmetry is the Galilei-group with the Lorentz invariance as a derived dynamic symmetry. The proposed model has the goal to derive all fields and their interactions from an exactly nonrelativistic operator field equation, resembling Heisenberg's relativistic spinor field equation. In this model the groundstate of the vacuum is a superfluid consisting of an equal number of positive and negative Planck masses interacting via delta function potentials and making the cosmological constant equal to zero. Gauge bosons come from transverse waves propagating in a lattice of quantized vortices, and spinors are explained in this model as exciton-like quasiparticles held together by gauge bosons. Because vector gauge bosons move in the model with the velocity of light, objects held together by the forcc fields of these bosons obey Lorentz invariance as a dynamic symmetry. With the longitudinal wave modes moving with a superluminal phase velocity at energies near the Planck scale, it is conjectured that the quantum mechanical wave function is real and that its collapse results from the entrapment of the wave function by these longitudinal superluminal wave modes. Because these modes occur near the Planck scale their very large zero point fluctuations might therefore trigger the collapse even through dense matter. But because the fluctuations are finite, and because the wave modes have a finite albeit very large phase velocity, the quantum mechanical correlations would be broken above a ccrtain finite length. In the limit of a vanishing Planck length, and hence vanishing gravitational constant G, the phase velocity would become infinite, and the same would be true for the length above which the correlations are broken. One therefore may say that in the limit G = 0 the collapse is infinitely fast and that in this limit the correlations are not broken even over arbitrarily large distances
Structural Properties of the Ion-Dipole Model of Electrolyte Solutions in the Bulk and Near a Charged Hard Wall.Application of the Truncated Optimized Cluster Series
Authors: Pizio O. A. , Halytch Z. B. 
Published: February 2015

Abstract
An ion-dipole model of electrolyte solutions in the bulk case and near a charged or uncharged hard wall is considered. A method to derive the terms of optimized cluster expansions for the distribution functions of ions and dipoles which provides a set of approximations beyond the mean spherical approximation is given. The third cluster coefficient approximation is investigated
Molecular Reorientation in Liquid Methanol
Authors: Ludwig R. , Gill D. S. , Zeidler M. D. 
Published: February 2015

Abstract
Oxygen-17 enriched methanol CD3
17OH was synthesized and 1H as well as 17O nmr relaxation rates were measured in the temperature range 180-310 K. By varying the 17O-content different contributions to the proton relaxation rate could be separated and from the 17O-H dipolar interaction contribution the correlation time of the OH bond was determined. These results are compared to recent computer simulation data. Additional deuteron relaxation measurements on CH3OD yielded the quadrupole coupling constant which increases with falling temperature. The 17O quadrupole coupling constant shows a similar trend with temperature but not as pronounced.
The Structure of Aqueous Electrolyte Solutions: Comparis on of Computer Simulation and Experiment
Authors: Neilson G. W. 
Published: February 2015

Abstract
This review compares results of neutron and X-ray diffraction experiments with computer simulation and theoretical calculation for aqueous electrolyte solutions at the atomic level in terms of the partial radial distribution functions of several ionic solutions, and includes results for the ion-water and ion-ion structure of systems containing alkali ions, alkaline earth ions, transition metal cations and a few anions
The Conductance of Naland Tetraethylammonium Iodide in Mixtures of Methanol with Acetonitrile and Water
Authors: Hawlicka E. , Grabowski R. 
Published: February 2015

Abstract
The conductance of Nal and Et4NI in methanol-acetonitrile and methanol-water mixtures was measured at 25 ± 0.005 °C for the whole range of the solvent compositions, the salt molarity ranging from 5 • 10-5 up to 1 • 10-2. Several equations describing the influence of the salt concentration on the equivalent conductance are examined and the Fuoss-Hsia equation with the Fernandez-Prini parameters is found to be the most appropriate one for systems with weak ionic association. Variations with the solvent composition of the limiting equivalent conductance, the distance between ions forming ion pairs and the association constant are discussed. Nonmonotonous changes of the association constant are concluded to be a feature of microheterogenous systems.
Computer Simulation Studies of the Adsorption of Water on a Metal Surface
Authors: Spohr E. , Wolfsberg M. , Bopp P. 
Published: February 2015

Abstract
We report computer simulations of the adsorption process of water on a platinum (100) surface. At very low impact energies the sticking coefficient approaches unity in agreement with experimental evidence. The sticking coefficient for the bare surface decreases strongly with increasing impact energy already in the energy range <0.5 eV and also with increasing surface temperature. At all but the lowest impact energies the sticking coefficient increases drastically if the impact zone of the approaching molecule is in the vicinity of preadsorbed water molecule(s). The reason for this phenomenon is efficient energy transfer into water-water degrees of freedom and/or into the metal O "bond" of the preadsorbed water molecules. In the present study, where surface diffusion does not play an important role because the impact zone is chosen to be close to the adsorbed molecule or cluster, hydrogen bonds are formed between incoming and preadsorbed molecules during approach and impact. Excess energy is transferred into the lattice within a few picoseconds leading to a two-dimensional hydrogen bonded water cluster.