bluuebunny/crossref_metadata_2025_split huggingface dataset:
and Cyclic Hydrocarbons on y-Aluminium Oxide
Authors: Sanesi Manlio , Wagner Vittoriano 
Published: February 2015

The heats of adsorption on weakly activated γ-Al2O3 of a number of linear 1-monoolefins (C4 to C9) and cyclic saturated and unsaturated hydrocarbons have been measured by gas-solid chromatography and extrapolated to zero surface coverage.
The double bond contribution to the adsorption energy is shown by comparison of the adsorption heats with those of the corresponding saturated molecules and is related to the existence of Brensted acid centers on the adsorbent surface. The effect of cyclization is also shown.
Ein 1-Zoll-Rubin-Riesenimpulslaser mit 50 Hz Impulsfolgefrequenz
Authors: Mahlein H. F. , Schollmeier G. 
Published: February 2015

Abstract
Zum reproduzierbaren und störungsfreien Riesenimpulsdauerbetrieb mit 50 Hz Impulsfolgefre-quenz eines 1-Zoll-Rubinlasers, der in einem Rotationsellipsoid exfokal durch eine gepulste Queck-silberdampf-Höchstdrucklampe gepumpt wird, werden verschiedene Resonatorausführungen mit me-chanischer Güteschaltung untersucht. Es wird über die Elektronik für den mit 400 Hz rotierenden Güteschalter und die mit den verschiedenen Resonatorausführungen erzielten Ergebnisse berichtet. Die rasche Impulsfolgefrequenz und die in den Resonatoren auftretenden hohen Leistungsdichten im 50 Hz-Riesenimpuls-Dauerbetrieb verursachen eine schnelle Zerstörung der üblichen dielektrischen Spiegelschichten. Die besten Ergebnisse zeigt ein Resonator ohne dielektrische Spiegelschichten, der aus einem Rubin mit angeschliffenem totalreflektierendem Prisma und rotierendem 3-Platten-Reso-nanzflektor als Güteschalter besteht. Diese Anordnung ermöglicht reproduzierbaren Einzelimpuls-dauerbetrieb mit 50 Hz Impulsfolgefrequenz im durch die Prismendachkante gefalteten Grundmode, falls die Laserleistung pro Riesenimpuls von 20 bis 25 ns Halbwertsbreite 50 bis 60 kW nicht über-schreitet.
Binary Systems Formed by Alkali Bromides with Barium or Strontium Bromide
Authors: Riccardi Riccardo , Sinistri Cesare , Campari Giuseppina Yiganó , Magistris Aldo 
Published: February 2015

By DTA and visual methods the phase diagrams of the ten binary systems formed by lithium, sodium, potassium, rubidium and cesium bromide with barium or strontium bromide have been drawn. Moreover, the fusion thermal effects regarding the eutectics and the congruent compounds singled out in the systems have been evaluated.
The general thermodynamic behaviour of these systems is discussed in comparison with the ideal one.
Über die Existenz der Schwingerschen Funktionale in der Quantenmechanik
Authors: Sohr H. 
Published: February 2015

Abstract
In der Feldtheorie bedient man sich in zunehmendem Maße des Funktionalkalküls. Beispiele dafür sind die S'-Matrix-Theorie und die Theorie der Schwingerschen Funktionale. Meist wird dieser Formalismus nur formal benutzt, ohne Konvergenzuntersuchungen. In dieser Arbeit soll die Konvergenz und damit die Existenz der Schwingerschen Funktionale als unendliche zeit-geordnete Operatorprodukte für eine Klasse von Systemen der Quantenmechanik bewiesen werden. Solche Systeme, z.B. der anharmonische Oszillator, werden in der Feldtheorie häufig für Modell-untersuchungen verwendet.
Untersuchungen über das Verhalten der chemischen Bindung im elektrischen Feld I. Das Fluorwasserstoffmolekül HF
Authors: Drossbach P. , Schmittinger P. 
Published: February 2015

Abstract
Das Fluorwasserstoffmolekül HF wurde unter Berücksichtigung seiner 10 Elektronen bei 5 verschiedenen Kernabständen und 10 verschiedenen elektrischen Feldstärken von 0,00025 bis 0,022 at. Einh. nach dem SCF-MO-LC(LCGO)-Verfahren berechnet. Das Dipolmoment wurde als Funktion des Kernabstandes und der Feldstärken berechnet. Bei positiven Feldstärken tritt eine Lockerung bis Zerfall der Bindung ein; bei negativen Feldstärken wird die Bindung fester.
Phasengleichgewichte und thermodynamische Analyse des Systems Antimon—Thallium
Authors: Predel Bruno , Schwermann Werner 
Published: February 2015

Abstract
Eine Revision der Gleichgewichtsverhältnisse im System Tl-Sb unter Verwendung thermo-analytischer, röntgenographischer und metallographischer Methoden ergab Gleichgewichtsverhältnisse, die von den bisher bekannten merklich abweichen. Es konnte unter anderem eine Verbindung der Zusammensetzung SbTl nachgewiesen und die Existenz von intermetallischen Phasen bei 10 und 25 At.-Proz. Sb erhärtet werden. Die Bestimmung der Schmelzenthalpie ermöglichte die Er-schließung der Mischungsenthalpien und Mischungsentropien der β-Thallium-Mischkristalle. Ferner gelang es, die Bildungsenthalpien der intermetallischen Phasen zu ermitteln. Es wurde gezeigt, daß die thermodynamischen Eigenschaften der β-Phase durch einen Umwandlungsanteil dominierend beeinflußt werden, der mit dem Übergang des Antimons von seiner stabilen Modifikation in eine kubisch raumzentrierte Struktur verbunden ist. Es konnte die Umwandlungsenthalpie und Umwandlungsentropie dieser hypothetischen Phasenumwandlung ermittelt werden.
Regelmäßige Relaxationsschwingungen in Rubinlasern durch Änderung des Resonators / Regular Relaxation-Oscillations of a Ruby Laser with with Varying Resonators
Authors: Malota F. 
Published: February 2015

Abstract
Regular Relaxation-Oscillations of a Ruby Laser with with Varying Resonators Regular relaxation-oscillations were observed in ruby lasers with moving resonator mirrors. The appearance of these oscillations depends on the mirrors speed and population-inversion, and is explained as synchronisation of different emitting regions, whereby each emitting region fulfills the conditions for the appearance of these oscillations as given by Röss.
Notizen: An Investigation of the 5.36 MeV Level in 6Li by Electron Scattering
Authors: Hutcheon R. M. , Neuhausen R. , Eigenbrod F. 
Published: February 2015

Abstract
The form factor for the excitation of the 5.36 MeV level in 6 Li has been measured in a momentum transfer region q = 0.3 ÷ 1.8 fm -1. Calculations of this form factor were performed with L - S coupled intermediate-coupling shell model wave functions.
Instabilität der positiven Säule endlicher Länge im magnetischen Feld / Instability of the Positive Column of Finite Length in a Magnetic Field
Authors: Janzen G. , Moser F. , Räuchle E. 
Published: February 2015

The instability of a diffusion-dominated positive column of a gas discharge in a longitudinal magnetic field is investigated both experimentally and theoretically. Dispersion relations are derived for the case of an m = l helical instability considering the finite length of the column. Regions of instability are calculated for various wavelengths of the instability.
Experiments were carried out in a positive column of variable length, ranging from 8.5 to 40 cm. at varying pressures of about 0.1 Torr of Neon. There is a satisfactory agreement between theory and experiments. The main results are:
a) in long tubes instability occurs at a distinct magnetic field, calculated first by Kadomtsev and Nedospasov. Stable intermediate regions are possible at higher fields depending on the relations between the plasma-parameters;
b) in short tubes the column is stable again for higher magnetic fields; c) in very short tubes there is no instability of this kind. The observed frequency spectrum agrees with the theoretical values
Untersuchung alter Luftproben aus Salzen des deutschen Zechsteins
Authors: Freyer H. D. , Wagener K. 
Published: February 2015

Abstract
Samples of sylvinite, halite and kieserite of the German Zechstein formation have been analyzed for the content of atmospheric components. The gas contents are of the order of 10-3 cm3 NTP/g salt. N2, O2, Ar, CO2, CH4, H2 and sometimes H2S have been analyzed. Obviously, all gases are molecularly dispersed in the crystal lattice and, probably, have been in equilibrium with the corresponding components solved in the solution. On this basis it seems to be possible to obtain quantitative data on the atmospheric composition at the time of the salt formation.
The Propagation of Periodic Waves in a Two-level System
Authors: Hofelich F. 
Published: February 2015

Abstract
In this article the possibility for the propagation of periodic waves in a two-level system is discussed. It turns out, that in the absence of processes leading to loss and gain of energy, respectively, periodic waves only are possible. Their frequencies are always greater than the transition frequency of the two-level system. The frequency difference and the deviation of the wave profile from a sinusoidal form increases with the strength of interaction of light field and two-level systems.
After the introduction of loss and source terms it turns out that only isolated periodic waves exist. The asymptotically stable ones among them act as asymptotic solutions to all other wave solutions. The frequencies and wave forms are affected in a similar way as without loss and source terms.
Permittivity and Dielectric Relaxations in Liquid-Ammonia Solutions
Authors: Breitschwerdt K. G. , Schmidt W. 
Published: February 2015

Abstract
Dielectric constant and loss in liquid-ammonia solutions of alkali halides have been measured in the frequency range 0.7 - 70 GHz. At least one relaxation process exists in this frequency range in addition to the relaxation of the solvent molecules. The additional relaxation is ascribed to the orientational polarisation of ion pairs. The concentration of the ion pairs, calculated with a special model, is 30 - 50% of the total concentration. The interaction between ions and solvent molecules is discussed.
Einfluß eines homogenen Magnetfeldes auf die Polarisation von Fluoreszenzlinien des Cu I-Spektrums nach Elektron enstoßanregung/ Influence of a homogeneous magnetic field on the polarization of fluorescence lines of the Cu I-spectrum induced by electron bombardment
Authors: Anger G. , Hartrott M.V. , Martyn H.-U. , Oppen G.v. 
Published: February 2015

Abstract
Using atomic beam techniques the polarization of fluorescence lines of the Cu I-spectrum was measured in dependence on magnetic field strength. The Cu-atoms were excited by electron bombardment and the magnetic field was parallel to the electron beam. Due to the decoupling of the hyperfinestructure of excited levels of the Cu I-spectrum the polarization of some observed spectral lines [3247 Å (4p 2P3/2 -4s 2S1/2); 5153 Å (4d 2D3/2 -4p 2P1/2); 5218 Å (4d2D5/2 - 4p 2P3/2)] increases with increasing magnetic field strength. These polarization measurements, which correspond to investigations on resonance scattering of light done by HEYDENBURG et al., can be used for a determination of hfs-coupling constants of excited states. The measurements on the 3247 Å-resonance line are used for a comparison with results of accurate level-crossing-experiments. Satisfactory agreement is obtained. The discussion of the polarization of the 5153 Å-line yields an A-factor of (9.6 ± 1-0) MHz and a lifetime of τ ≈1.7 · 10 -8 sec for the 4d2D3/2-level.
Messungen der radialen Verteilungen von elektrischer Stromdichte und Temperatur im Wasserstofflichtbogen mit axialem Magnetfeld
Authors: Schwenn R. 
Published: February 2015

Abstract
The radial distribution of the axial electric current density in a stationary hydrogen arc with axial magnetic field was measured. This was done by shooting small induction coil probes across the arc. The experiments confirmed that the arc current is almost completely restricted to the magnetic flux tube defined by the cathode radius, as discussed in a previous paper. In the case of a hollow anode a distinctly tube-like current density distribution was found.
With the aid of the axial electric field measurements already presented temperature profiles in good agreement with other experimental methods were derived. In addition, the ohmic heat input into the arc could be determined. This is much larger than the energy that can be lost radially as a result of thermal conduction according to the measured temperature profile and the thermal conductivity known from the theory. The cause may be the Rayleigh-Taylor instabilities which were observed or radial mass flows directed outwards. Allowing for even relatively slow flows (υr ˂ 104 cm/sec) in the calculations one obtains good agreement with the measured distributions.
Notizen: Vibrational Excess Entropy of Equimolar KCl—KBr Solid Solution
Authors: Ahtee M. , Pesonen A. , Salmo P. , Inkinen O. 
Published: February 2015

Abstract
The Debye-Waller factors of the ions in equimolar KCl — KBr solid solution at 300 K have been determined from X-ray diffraction data. It was observed that the amplitudes of ther-mal vibration are slightly higher in the solid solution than in the pure components. The corresponding vibrational excess entropy was found to be about 10% of the entropy of ideal mixing.
On the Heating of a Pinch
Authors: Mewe R. 
Published: February 2015

Abstract
The compression temperature of a theta pinch is calculated as a function of the circuit para-meters and the final /?-value of the plasma. One of the results is that the temperature, T, at the peak magnetic field, B, scales of (B B) t/s , where B is the initial rate of rise of the magnetic field. A possibility of combining two capacitor banks to increase the implosion heating rate is discussed.
Herstellung und Eigenschaften eines neuen (ZnCd)S: Mn-Präzipitat-LeuchtstofTes
Authors: Preslawski N. 
Published: February 2015

Abstract
Optimal conditions for the preparation of precipitate phosphors were determined by measurements of the spectral emission distribution under UV excitation (365 nm). The emission of the Mn peak goes with increasing Cd concentration through a maximum, independent of the method the Cd was incorporated. The increasing gain, stimulated by the addition of Cd, is discussed using known energy models.
Untersuchungen über das Verhalten der chemischen Bindung im elektrischen Feld. IV
Authors: Drossbach P. , Schmittinger P. 
Published: February 2015

Abstract
Es wurden nach dem SCF-LC(LCGO)-Verfahren die folgenden Moleküle geredinet: H2 ohne und mit elektrischem Feld, HCl, HCIO, LiF ohne und mit Feld, LiCl, NaF und NaCl. Die Dichte-verteilungsfunktionen der Orbitale des LiF und die Orbitalschwerpunkte aller Moleküle wurden aufgezeichnet.
Zur Strömung kompressibler Plasmen im Eigenfeld von Lichtbogenentladungen
Authors: Hügel Helmut 
Published: February 2015

Abstract
The flow of compressible plasmas in axisymmetric channels of constant or variable cross sections under the influence of electromagnetic bodyforces and of Joule heating is described in terms of magneto-gasdynamics. The existing electric and magnetic fields are not independently applied, but originate as the electric field and self-induced magnetic field from a d. c. arc-discharge.
Under the condition of low magnetic Reynolds numbers a quasi-one dimensional description of the flow is given using the flow parameters velocity, Mach number, pressure, density and temperature. For these quantities five coupled first-order differential equations are obtained. A qualitative discussion outlines typical solutions and points out some features which are the same for flows in arc-discharges and for flows in so-called crossed fields. The conditions for a continuous passage through the sonic point are discussed. For flows in diverging nozzles results of numerical integration are presented.
Experimental investigations are reported which verify the self-magnetic effect in nozzle flows. At arc currents of 500 to 3000 amps measured values of thrust and Mach number show satisfactory agreement with theoretical results.
Nuclear Structure of 6Li and High-Energy Electron Scattering
Authors: Lodhi M .A . K . 
Published: February 2015

Abstract
The nuclear charge form factgr from the high-energy elastic electron scattering on 6Li has been calculated from the modified independent-particle shell model (IPSM) wave function. The usual harmonic oscillator type IPSM wave function has been modified by the inclusion of a nucleon-nucleon correlation function which involves extra-core nucleons only. The technique is extremely simple and provides an excellent agreement with the experimental data.
Relative Line Intensities in the Lyman Bands of HD and H2
Authors: Becker K. H. , Fink E. H. 
Published: February 2015

Abstract
Relative intensities of P (J'+ 1) and R (J '-1) lines have been measured in the (ν′ = 3, ν") progressions of the Lyman bands of HD and H2 . The intensity ratios are in good agreement with previous experimental data and with the results of theoretical calculations which account for the centrifugal dis­tortion.
Ein Mikrowellen-Mikrowellen-Doppelresonanz- experiment. Abtrennung der höherfrequenten Pumpe vom Detektor durch Verwendung gekreuzter Felder
Authors: Andresen U , Rudolph H. D. 
Published: February 2015

Abstract
In a microwave double-resonance experiment involving three rotational levels of propylene oxide perpendicular polarization of the pump and signal radiation was employed to prevent the higher-frequency pump radiation (24 GHz) from reaching the signal detector (11 GHz). For this purpose the independent cut-off characteristics of the TE10 and TE01 waveguide mode were exploited which depend only on the broad or small-face waveguide dimension, respectively.
Atomic-K-X-Ray Intensity Ratios
Authors: Schult O.W.B. 
Published: February 2015

Abstract
Experimental K-X-ray intensity ratios Kα2/Kα1, Kα3/Kα , Kβ1/Kα1 , Kβ2/Kβ1 , Kβ3/Kβ1 , Kβ4/Kβ1 and Kβ5/Kβ1 have been determined for several elements with 63≤Z≤92. These ratios agree very well with the results of a fully relativistic calculation of transition probabilities by Rosner and Bhalla. The theoretical values are tested with an accuracy of better than one per cent for the ratios Kα2/Kα1 , Kβ2/Kβ1 and Kβ3/Kβ1 .
Elektronenbestrahlungsexperimente an Tantal
Authors: Meissner D. , Schilling W. 
Published: February 2015

Abstract
In high purity Ta-foils the damage production during electron irradiation at 4.5 °K has been studied using electrical resistivity measurements. The observed dose curves show a strong saturation effect, i. e., the effective damage rates decrease with increasing defect densities. Two mechanisms contribute to this radiation annealing effect: 1) Spontaneous recombination of newly produced interstitials or vacancies with vacancies or interstitials already present in the crystal (direct re­ combinations) and 2) spontaneous recombination of close Frenkel pairs under the influence of nearby low energy recoil events (subthreshold events). The contribution of both direct recombin­ations and subthreshold events can be separated by subthreshold test irradiations as well as by radiation doping experiments. Both methods yield mutually consistent results. From these one can deduce a value of the spontaneous recombination volume of about 50 atomic volumes and a value for the cross section for the spontaneous recombination of a close Frenkel pair by subthreshold energy transfers from 1.2 MeV electrons of about 90,000 barns.
Rotationsstruktur im 21,22 eV-Photoelektronenspektrum von H2
Authors: Brehmund Burkhard , Frey Rüdiger 
Published: February 2015

Abstract
Rotational Structure in the 21.22 eV Photoelectron-Spectrum of H2: The form of the vibrational steps in the 21.22 eV potoelectron-Spectrum of H2 was analysed using a retarding field electron energy spectrometer with 10 meV resolution and a computer programme for a least squares fit analysis. Even though the broadening caused by the thermal motion of the H2 molecules during the photoionization process prevented the complete resolution of the rotational structure, it is possible to conclude from the results that the angular momentum of the nuclear rotation does not change in the photoionization process of H2 molecules with 21.22 eV photons.
Curie-Weiß Temperature Dependence Of Paraelasticity
Authors: Tretkowski J. , Völkl J. , Alefeld G. 
Published: February 2015

Abstract
Anelastic strains exceeding elastic strains up to a factor of 30 have been observed close to the critical point of H in Nb. The temperature dependence of the relaxation strength follows a Curie-Weiß law for temperatures (T - Tc)/Tc ≥ 6-10-3.
Feldtheoretische Konstruktion der Jordan—Brans—Dicke-Theorie / Fieldtheoretic Construction of the Jordan-Brans-Dicke-Theory
Authors: Grünberg H. von 
Published: February 2015

Abstract
In the framework of Lorentz invariant theories of gravitation the fieldtheoretic approach of the generally covariant Jordan-Brans-Dicke-theory is investigated.
It is shown that a slight restriction of the gauge group of Einstein's linear tensor theory leads to the linearized Jordan-Brans-Dicke-theory. The problem of the inconsistency of the field equations and the equations of motion is solved by introducing the Landau-Lifschitz energy momentum tensor of the gravitational field as an additional source term into the field equations. The second order of the theory together with the corresponding gauge group are calculated explicitly. By means of the structure of the gauge group of the tensor field it is possible to identify the successive orders of the scalar-tensor theory as an expansion of the Jordan-Brans-Dicke-theory in flat space-time. The question of the uniqueness of the procedure is answered by showing that the structure of the gauge group of the tensor field is predetermined by the linear equations of motion. The mathematical proof of this fact confirms formally the meaning of the equations of motion for the geometry of space.
On the Stability of Superheavy Nuclei against Fission, Alpha Decay and Electron Capture
Authors: Grumann Jens , Morovic Tihomir , Greiner Walter 
Published: February 2015

Abstract
The potential energy surface has been calculated by two methods which are compared with re­spect to spontaneous fission. In the first one essentially the sum of the single particle energies is computed as was done in a previous paper3 while in the second one the Strutinsky technique of renormalizing to a liquid drop model has been applied. Also the half-lives for electron capture are investigated together with the predictions of the half-lives for spontaneous fission and α-decay. The results support the existence of superheavy nuclei in the regions around Z = 114 and Z = 164.
Spectral Investigations of Some Rare Earth β-Diketonates in the Region 750—250 cm-1
Authors: Mehta P. C. , Tandon S. P. 
Published: February 2015

Abstract
The infrared absorption spectra of fifteen La3+, Pr3+, Nd3+, and Sm3+ β-diketonates have been studied in the spectral region 750-250 cm-1. The existence of three metal-oxygen vibration modes suggests D3 symmetry for the chelates under study. The stretching force constants, fMO , of the MO bonds have been computed from the observed infrared M-O vibrations using the method of Müller. The value of fMO is nearly constant (~ 2.7x105 dynes/cm) in all the chelates suggesting similar bond strengths.
Notizen:Zinndioxidschichten auf stabilisiertem Zirkon­dioxid als Kathoden in Hochtemperatur- Brennstoffzellen
Authors: Böhm R. , Kleinschmager H. 
Published: February 2015

Abstract
Durch "Chemical Vapour Deposition" auf porös auf­gerauhtem Träger aus stabilisiertem ZrO2 abgeschiedene SnO2-Schichten mit mehr als 8 At.-Proz. Sb können als Ka­thoden in Hochtemperatur-Brennstoffzellen bei 1000 °C ver­wendet werden; die Materialkombination übersteht Tempera­turzyklen zwischen Betriebs-und Zimmertemperatur ohne Be­einträchtigung der Haftfestigkeit oder der elektrischen Funk­tion.
Untersuchung der Eigenschaften von Haftstellen in ZnS-Kristallen durch Leitungs-und Thermolumineszenzmessung
Authors: Thoma Peter 
Published: February 2015

Abstract
Measurements of the thermoluminescence between 4,2 and 200 K and of the conduction properties of different ZnS-single crystals with thicknesses between 1 mm and 2 μm are performed. It is shown that the trap centers, which cause the optical glow curves, are quite different from those centers, which act as traps for carriers being injected from outside in the course of conduction experiments.