bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Slip Problems for a Simple Gas
Authors: Loyalka S.K. 
Published: February 2015

Abstract
Simple and accurate expressions for the velocity slip coefficient, the slip in the thermal creep, and the temperature jump coefficient are obtained by applying a variational technique to the linearized Boltzmann equation for a simple gas. Completely general forms of the boundary conditions are used, and the final results are presented in a form such that the results for any particular intermolecular force law or the gas-surface interaction law can easily be calculated. Further, it is shown that, with little extra effort, the present results can be easily extended to include the case of a polyatomic gas. It is felt that the present work, together with a recent paper in which the author has considered the solutions of the linearized Boltzmann equation for a monatomic multicomponent gas mixture, provide the desired basis for the consideration of the various slip problems associated with the polyatomic gas mixtures.
Nonisothermal Diffusion Measurements on Granular Solids: Noble Gas Diffusion in Fused Silica
Authors: Abe M. , Rauch B. , Brandt W. W. 
Published: February 2015

Abstract
Samples of fused SiO2 and of a soda-lime glass were exposed to He, Ne, and Ar at temperatures between 523 and 763 °K, cooled to room temperature, transferred to a desorption cell, and then heated slowly and uniformly. The cell was connected to a mass spectrometer and the desorption rates were measured as a function of time. From the data, the parameters E and Do of the Arrhenius equation for the diffusion coefficient [D = D0exp(-E/RT)] were calculated. The results were found to agree rather well with literature data obtained on similar glasses using isothermal methods. Since the nonisothermal technique may be very useful for the study of granular materials and powders, the problems related to the presence of a grain size distribution and to the irregularities of grain shapes are treated in this study in some detail.
Viscosity of Ammonia and its Mixtures with Noble Gases in an Electric Field
Authors: Tommasini F. , Levi A.C. , Scoles G. 
Published: February 2015

Abstract
The component η3 of the viscosity of ammonia increases in an electric field. The effect depends on E2/ p and tends to a saturation value close to that found from measurements in a magnetic field. In ammonia-helium mixtures the saturation value of the effect decreases and becomes negative at an ammonia concentration of about 40%.
Untersuchungen zur Streulichtverteilung an Gläsern mit Phasentrennung / Angular Dependence Light Scattering Studies of Glasses Showing Phase Separation
Authors: Becherer G. , Göcke W . , Herms G. 
Published: February 2015

Abstract
By investigating the angular distribution of light scattered by glasses showing diffusion con-trolled phase separations, data can be obtained about the dimensions of the scattering particles without knowing absolute scattering intensities or further physical and chemical properties of the glass. - A known model of the scattering particle, based on diffusion controlled growth, may satisfactorily describe the conditions within the scattering sample, as shown by Gaussian least square calculations. The model and its scattering curves may explain the experimentally observed maximum of intensity at large scattering angles. Interpretation of scattering curves shows the influence of the diffusion zone on the intensity curve and supplies not only the radius of the inner "nucleus" of the scattering particle, but also the dimensions of the diffusion zone. - According to diffusion controlled growth, the volumes, and not the radii, of the growing particles turned out to be proportional to heat treatment time.
Comments on the Geometry of CH2
Authors: Yeranos W. A . 
Published: February 2015

Abstract
Although the vast majority of the theoretical de-terminations 1-10 of the geometry of the ground state of CH2 had favored a bent structure n , it is only very recently that the controversy about its nonlinearity has ended 12 . Prompted by WASSERMAN'S E.S.R. results 13 , HERZ-BERG, upon reexamination of the UV spectrum of CH2 , has recently proposed 12 that an alternate interpreta-tion of the observed data suggests that the latter be bent with a CH equilibrium distance of 1.078 Ä and an HCH angle of 136°, in contradistinction to his ear-lie values of 1.029 A and 180°. We, in this laboratory, have considered the geometry of this radical within the framework of the modified extended Hiickel approximation, the methodology of which is given, in detail, elsewhere 14 and shall not be repeated here. Figure 1 gives the angular dependence of the modi-fied extended Hiickel energy (£MEH) of CH2 as a func-tion of the internuclear distance. Our results indicate that r0(CH) fiil.lOÄ and < £ HCH ^ 135.8° with an approximate potential barrier of 1.4 kcal/mole. It is indeed interesting to note that at the earlier reported internuclear distance of 1.029 Ä our calculations sug-gest a linear structure. Perhaps, the most important outcome of the present study, however, was the fact that in the case of CH2 not only does the modified extended Hiickel approxi-mation seem to be superior to the regular one, a doc-tored version 7 of which gives a shallow minimum at 155°, but that it also compares favorably well with the most elaborate of ab initio calculations (s. Table 1). It is indeed extremely gratifying to find that our sim-ple methodology gives as good results as the most sophisticated and "high-accuracy" calculations of BEN-Author (s) Type of Calculation or experiment r min (CH) < CHC HARRISON and ALLEN 8 Ab initio Valence Bond 1.058 A 138° BENDER and SCHAEFER III 9 Ab initio M.O. 1.096 135.1
Geometriefaktoren von Hohlraumresonatoren zur Elektronendichte-, Dichteprofil- und Stoßfrequenzmessung von Plasmen
Authors: Janzen G. 
Published: February 2015

Geometry factors of cavity resonators for the determination of plasma electron density, density profile, and collision frequency Geometry factors of a number of cylindrical TEimn and TMimn cavity resonance modes are cal-culated as a function of the ratio of plasma and cavity radius and as a function of the radial electron density profile. In axial direction homogeneous and sinusoidal density profiles are assumed.
Resonance modes with a small index l are suitable for the measurement of electron densities in narrow and dilute plasma columns; modes with an index l ≧ 2 are specially advantageous for measuring the density profile.
Results of measurements of the electron density, density profile, and collision frequency in nitrogen are given.
Miscibility Gaps in Fused Salts
Authors: Flor Giorgio , Margheritis Chiara , Sinistri Cesare 
Published: February 2015

Demixing phenomena in mixtures containing Li2SO4 with ZnBr2, CdBr2 or PbBr2 have been extensively studied. It has been found that the tendency to demix in these systems is greater than in the corresponding systems containing chloride instead of bromide ions.
Moreover, the extension of the miscibility gap in the investigated systems increases when going from Li, Zn/Br, SO4 to Li, Pb/Br, SO4 to Cd, Li/Br, SO4. This sequence in the tendency to demix is slightly different from that found for the systems containing chlorides.
The analysis of the standard enthalpy variation of the methatetic reaction allows a correct prevision in the sequence of the tendency to demix for the studied systems
Binary Systems Formed by Lead Bromide with (Li, Na, K, Rb, Cs and Tl)Br: a DTA and Diffractometric Study
Authors: Cola Mario , Massarotti Vincenzo , Riccardi Riccardo , Sinistri Cesare 
Published: February 2015

The phase diagrams of the systems PbBr2 + MeBr (Me = L i , Na, K, Rb, Cs, Tl) have been measured by visual and DTA methods.
The structures and the thermal characteristics of the intermediate compounds have been pointed out by X-ray diffractometric technique and by DTA-calorimetric measurements, respectively.
Moreover, the thermodynamic behaviour of these systems has been discussed
Predictable Low Enrichment of Methane Isotopes by Clusius-Dickel Thermal-Diffusion Columns for Use in Radiocarbon Dating Technique
Authors: Erlenkeuser H. 
Published: February 2015

By means of the Clusius-Dickel thermal-diffusion column the range of the radiocarbon dating method may be extended by 20 000 years. It is shown in this work that the total sample amount required is reasonably low, if column dimensions are suitably chosen. The enrichment run time and the length of the thermal-diffusion column will allow sample enrichment in routine operation. Optimal values of column dimensions and operation conditions are calculated.
With an all metal thermal-diffusion column that has been carefully constructed, a high reproducibility is found. The stationary as well as the non-stationary state operation are in agreement with column theory within 1%, concerning the enrichment both of C13H4 and C14H4 in methane. The theory has been evaluated by numerical methods
intensities of the
Authors: Lechert H. , Hennig H. J. 
Published: February 2015

The results of measurements of the 23Na-resonance of samples of the zeolite Linde 13X of SO2 show that at low coverages the SO2-molecules disturb the symmetry of the crystal field at the centre of the double six membered rings of the faujasit structure. Comparing this with results obtained from samples containing water, ammonia or hydrogen sulphide, one sees that the disturbance of the symmetry in the above-mentioned sites is not only connected with the ability of proton donation or hydrogen bonding to the alumosilicate framework, but can also be affected by other polar molecules containing no protons.
In contrast to the adsorption of water and ammonia, the sodium ions at the walls of the large cages are not solvated by SO2
On the Photoelectron Spectrum of NO
Authors: Edqvist O. , åsbrink L. , Lindholm E. 
Published: February 2015

Abstract
The photoelectron spectra of NO have been remeasured with 584 Å and 304 Å He lines at high resolution and the energies of the bands have been determined by calibration against argon. A weak He I line 320.4 Å has been found to cause the small peak at 20.4 eV, which was assigned earlier as the c 3II state. The c 3II and B 1II states have nearly the same energy, 21.7 eV. The vibrational structure of the B′ 1Σ+ state at 22.5 eV has been resolved.
Das Wassermolekül nach dem SCF-MO-P(LCGO)-Verfahren
Authors: Schmittinger P. 
Published: February 2015

Abstract
Bei der Berechnung sehr großer Moleküle im Rahmen des SCF-MO-P(LCGO)-Verfahrens ist es notwendig, daß die verwendete Basis, da sie klein ist, gut bezüglich des Energieminimums durchvariiert wird.
Aus diesem Grunde werden hier Rechnungen am Wassermolekül durchgeführt, die nur zwei Gaußfunktionen am Sauerstoflatom enthalten.
Sie gehen damit nur wenig über das FSGO-Verfahren hinaus und es zeigt sich, daß auf diese Weise schon Aussagen gewonnen werden können, die mit der Erfahrung gut übereinstimmen, im besonderen, was die Energieverteilung anbetrifft.
Spezifischer Widerstand und Thermokraft aufgedampfter Nickelfilme bei 273 °K
Authors: Welder G. , Reichenberger H. , Wenzel H. 
Published: February 2015

Abstract
Es wird eine Methode zur gleichzeitigen Messung des spezifischen Widerstandes und der Thermokraft aufgedampfter Metallfilme im Bereich der Raumtemperatur beschrieben.
Die Schichtdickenabhängigkeit des spezifischen Widerstandes, des Widerstandstemperaturkoeffizienten und der Thermokraft werden für ein Einbandmodell mit Hilfe der Weglängentheorie von Fuchs und Sondheimer bzw. der Theorie der Streuung an den Kristallitgrenzen diskutiert. Es zeigt sich, daß die an Nickelfilmen mit Schichtdicken zwischen 25 und 1000 Å gewonnenenen experimentellen Ergebnisse mit diesen Ansätzen qualitativ gut beschrieben werden können.
Zum Frequenz-Zeit-Verhalten organischer Farbstofflaser
Authors: Rapp W. , Spies G. O. 
Published: February 2015

Abstract
The stability of arbitrary toroidal magnetohydrostatic equilibria is investigated near the limit of a vacuum magnetic field. Nonsingular expansions in powers of β ~ p/B2 are considered to all orders. Order by order minimization of the energy variaiton shows that any orders are positive semidefinite in the nullspace of all lower orders if either the vacuum field has shear or (for an identically vanishing rotational number) the interchange stability condition is satisfied. The question of sufficiency for stability at low β of these conditions is discussed. While sufficiency of shear can be refuted by considering localized modes, this question remains open for the interchange stability condition.
Resonant Wave-Particle Interaction in Nonuniform Plasmas
Authors: Saitta L. , Engelmann F. 
Published: February 2015

Abstract
The appearance of resonant-particle effects in the linear dynamics of electron waves in a plasma whose electrons are trapped in a potential trough is discussed and conditions for the characteristic times involved are derived. For the special case of a parabolic potential trough it is shown that, within a limited time interval, a strong resonant effect may occur, due to the interaction of a wave with all particles, which is not contained in the solutions given so far.
Functional Quantum Theory of Scattering Processes. IV
Authors: Stumpf H. 
Published: February 2015

Abstract
Dynamics of quantum field theory can be formulated by functional equations. To develop a complete functional quantum theory the physical information has to be given by functional operations only. The most important physical information of elementary particle physics is the S-matrix. In this paper the functional ^-matrix is constructed for the scattering of relativistic dressed particles, i.e. for particles with structural properties. The basic functional equation is assumed to be derived from a nonlinear spinor field equation with noncanonical relativistic Heisenberg quantization. The initial free dressed many particle states are defined, and the scattering functionals are constructed. By the use of irreducible representations the equivalence of the functional S-matrix with the conventional Hilbert space definition is shown with respect to an appropriate definition of the functional scalar product. Technical details are discussed in the appendices.
Nuclear Magnetic Resonance Studies of 35Cl, 37Cl, 79Br, and 81Br in Aqueous Solution
Authors: Blaser J. , Lutz O. , Steinkilberg W. 
Published: February 2015

Abstract
The NMR signals of the nuclei 2H, 35Cl, 37Cl, 79Br and 81Br have been investigated in aqueous solutions. The concentration dependence of the NMR signals of 35Cl and 81Br has been determined in solutions of alkali halides and alkali perchlorates in H2O and D2O and the large solvent isotope effect on the chemical shift has been established. The ratios of the Larmor frequencies of the halide nuclei relative to 2H have been measured with high accuracy. Using the concentration dependence, the ratios of the Larmor frequencies of the halide nuclei for infinite dilution relative to 2H in pure D2O are given. From these ratios, magnetic moments for the halide nuclei have been derived.
Propagation of Microwaves in a Circular Waveguide Partially Filled with a Cold Plasma Dielectric
Authors: Gehre O. , Mayer H. , Tutter M. 
Published: February 2015

Abstract
The dispersion of microwaves propagating through a circular waveguide partially filled with a homogeneous lossless and cold electron plasma has been studied. Quantitative dispersion curves have been computed for the lowest radial modes of circular and dipole symmetry without using the quasistatic approximation. The curves comprise both “fast” or “waveguide” modes and “slow” or “plasmaguide” modes. Easily applicable approximations for the lowest waveguide modes are given.
The Optical Potential in Electron Diffraction
Authors: Howie A , Stern R. M. 
Published: February 2015

Abstract
Expressions are derived for the optical potential and related mean free path as a function of energy in the range 20 eV to 100 keV for electrons and estimates are made of the contributions from the electronic excitations, thermal diffuse scattering and disorder scattering in Al, Cu and Au.
Ionization Energies and Ring Orbital Interaction in Diarylmethanes and Diarylethanes
Authors: Pignataro S , Mancini V , Innorta G , Distefano G 
Published: February 2015

Abstract
The ionization energies of a number of mono-and disubstituted diarylmethanes and diarylethanes were measured by electron impact mass spectrometry. No clear evidence of the homo conjugative phenomenon is obtained from this gas phase observable of the systems studied.
Zum Rotations-Zeeman-Effekt in Dimethylketen / Molecular Zeeman Effect and the Determination of the Molecular g Values, Paramagnetic Susceptibilities, and Molecular Quadrupole Moments in Dimethylketene
Authors: Sutter D. , Charpentier L. , Dreizler H. 
Published: February 2015

Abstract
The rotational Zeeman-Effect in the microwave spectrum of dimethylketene was investigated at fieldstrengths close to 22 kG. Only ΔJ= 1 rotational transitions with ΔM = ± 1 selection rules did show appreciable splittings due to the magnetic field. From the splittings the diagonal elements of the molecular gr-tensor were determined to be:
gaa = ∓ 0.020(3) ; gbb = ∓ 0.0165(8) ; gcc= + 0.0126(5).
(Only the relative signs of the g-values are obtained from the experiment). The susceptibility anisotropics were found to be close to zero.
ortho-Effects in Mass Spectra. Alteration of the Molecular-Ion Energy Distribution in Disubstituted Acetanilides
Authors: Benezra Steven , Bursey Maurice 
Published: February 2015

Abstract
Simplified quasi-equilibrium calculations performed on the mass spectra of dihalosubstituted phenyl acetates and acetanilides again uncover the same substituent effects on the rise of K with E for the loss of ketene from phenyl acetates as was determined for the monosubstituted phenyl acetates. However, a new effect is found for the disubstituted acetanilides, removal of excitation probability for low-lying energy states of the molecular ion. This effect parallels the removal of transition probability for the lowest excited state of the neutral molecule.
The Development of Random Striations in the Positive Column of a Glow Discharge
Authors: Grabec I , Poberaj S 
Published: February 2015

Abstract
The paper represents an analysis of the characteristic properties of spontaneously excited irregu-lar striations observed in the positive column of a glow discharge. Comparisions with the properties of coherent, externally excited, growing ionization waves lead to the conclusion that irregular stria-tions are random ionization waves. Assuming that random striations originate at the cathode end of the positive column, their frequency spectrum can be approximately explained from a knowledge of the dispersion relation of ionization waves. The nonlinear properties of random striations remain to be explained
Der Einfluß der Umgebung auf die Spektren gelöster Moleküle in Lösungsmittelmischungen / The Influence of Environment on the Spectra of Solid Molecules in Solvent Mixtures
Authors: Kawski A. , Strzalkowska C. 
Published: February 2015

Abstract
Ein Vergleich spektroskopischer Daten mit theoretischen Aussagen über die Wirkung des Lösungsmittels auf die Elektronenübergänge gelöster Moleküle liefert Aussagen über die Strukur der Solvathülle gelöster polarer Moleküle. An den Molekülen N-Phenyl-α-Naphthylamin und N-Phenyl-β-Naphthylamin in n-Heptan-n-Butanol-Mischungen lassen sich, wegen der Anreicherung der polaren Lösungsmittelmoleküle in der Nachbarschaft eines gelösten Moleküls, lokale effektive DK-Werte feststellen, die erheblich von der mittleren DK des Lösungsmittels abweichen.
Diffusionsuntersuchungen im System Palladium—Vanadium mit Hilfe der Mikrosonde / Diffusion In The System Pd—V Investigated By Means Of An Electron Microprobe
Authors: Lamparter Peter , Krabichler Traudl , Steeb Siegfried 
Published: February 2015

Abstract
Diffusion processes (600 to 1300 °C) were investigated by means of quantitative electron-probe-microanalysis. The composition of the diffusion zone corresponds quite well with the phase diagram. The following phases were observed: Pd-solid solubility, Pd3V, Pd2V, and V-solid solubility. Below 900 °C the growth of the diffusion zone is retarded; above 900 °C the layer grows according to d = k ·√t. For all phases observed, according to Matano's method the coefficients of the inter-diffusion were determined. The temperature dependency of these coefficients as well as that of the k-values follows an Arrhenius law. Thus the activation energies of the layer growth and of the interdiffusion were obtained. The determination of the intrinsic diffusion coefficients by the observation of the Kirkendall-effect is discussed.
Quantitative Messung des Elektronenaffinitätskontinuums von Chlor mit dem Stoßwellenrohr / Quantitative Measurement Of The Electron Affinity Continuum Of Chlorine With The Shock Tube
Authors: Pletsch G. 
Published: February 2015

Abstract
Using a mixture of chlorine with krypton the continuous spectrum resulting from electron attachment to chlorine atoms is produced in a shock tube. Absolute intensity measurements lead to the detachment cross-section of the negative chlorine ion in the wavelength region between the long-wave threshold at 3434 Å and 2700 Å. The cross-section is compared with known experimental and theoretical values.
Diskussion der diffusen Laue-Streuung flüssiger Legierungen / Remarks on the Diffuse Laue-Scattering of Liquid Alloys
Authors: Ruppersberg H. , Goebbels K. 
Published: February 2015

Abstract
Prepeaks in the partial structure factors of liquid alloys are interpreted as a modulation in the diffuse Laue-scattering, caused by chemical short range order. It is shown and experimentally confirmed that the partial structure factors can become lower than -1. It is unlikely that a modulation appears in only one of the three partials; rather a chemical short range order should be indicated in all three partial structure factors.
The Temperature Dependence of the Isotope Effect for Electromigration of Rubidium Ions in Molten Rubidium Nitrate
Authors: Lundén Arnold , Floberg Allan , Mattsson Ronny 
Published: February 2015

Abstract
The relative difference (Δb/b) between the internal electromigration mobilities of 85Rb and 87Rb in molten RbNO3 has been measured over the range 355 to 500 °C. The mass effect μ = (Δb/b)/(Δm/m) has a complicated temperature dependence. Thus, the largest mass effect, -μ=0.061, was obtained at 445 °C, while it is about 0.033 at 350 °C and 0.041 at 500 °C. A similar temperature dependence was found by SAITO et al. for μNa in pure NaNO3, and for both μRb and μNa maxima have been found also in nitrate mixtures (in KNO3-RbNO3 and NaNO3-KNO3)
Notizen:Excitation of N2
+ by Vibrating Nitrogen Molecules
Authors: Alderson R. , Brocklehurst B. 
Published: February 2015

Abstract
Flowing nitrogen gas, bombarded by 50 keV electrons, emits the first negative and second positive bands. Operation of a microwave discharge upstream enhances the former, but not the latter: this is shown to be due to conversion of vibra-tional excitation in N2 into electronic excitation in N, + .
Atomic Reference Scale for Chemical Shifts of Rubidium
Authors: Lutz O. , Nolle A. 
Published: February 2015

Abstract
With a multi-nuclei Fourier transform NMR spectrometer the ratio of the Larmor frequencies of 85Rb and 2H in a solution of RbCl in D2O has been measured with high accuracy. The concentration dependence of the 85Rb NMR signals has been determined in solutions of rubidium salts in H2O and D2O. Using this dependence, the ratio of the Larmor frequencies of the 85 Rb nuclei for infinite dilution relative to 2 H in pure D20 is given. From this a gI-factor for 85Rb has been derived and has been compared with the gI-factor of an optical pumping experiment. The difference in the gI-factors results from the shielding of the rubidium nuclei by the water molecules around the ions. The shielding constant is σ(85Rb+) = -2.11 (2) · 10-4 . This yields a general atomic reference scale for the chemical shift of rubidium in the liquid and solid states and the possibility of comparing experimental and theoretical shielding constants.