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1984[X]
81Author    F. R. Wahl, K. Duscher, J. K. Göbel, MaichleRequires cookie*
 Title      
 Abstract    The present work is an attempt to treat hydrogen storage in metals with the aid of field theoretical methods. Starting with the many-body Schrödinger equation, an adiabatic decompo­ sition yields an electronic system, a protonic system and a host lattice system. We define a storage energy consisting of a lattice contribution and an electronic part. The latter one will be evaluated by The New Tamm-Dancoff (NTD) procedure. This formalism is a method to compute differences of eigenvalues in quantum mechanical problems. As an example we derive a one-particle equation describing a single hydrogen atom in a metal crystal. 
  Reference    Z. Naturforsch. 39a, 524—536 (1984); received March 16. 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0524.pdf 
 Identifier    ZNA-1984-39a-0524 
 Volume    39 
82Author    G. Govers, VertogenRequires cookie*
 Title     
 Abstract    The orientational correlation functions in the isotropic phase of nematics are calculated starting from the expression of De Gennes for the free energy density of this phase. C o rre la tio n F u n c tio n s in th e I s o t r o p ic P h a s e o f N e m a ti c s 
  Reference    Z. Naturforsch. 39a, 537—541 (1984); received December 6. 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0537.pdf 
 Identifier    ZNA-1984-39a-0537 
 Volume    39 
83Author    D. Wecker, R. N. SchindlerRequires cookie*
 Title     
 Abstract    n te rs u c h u n g e n m it H ilfe d e r E l e k tr o n e n z y k l o tr o n r e s o n a n z -(E C R)-T e c h n ik X V I Wechselwirkung von HNO3 und CINO3 mit niederenergetischen Elektronen in der Gasphase Studies by the Electron Cyclotron Resonance-(ECR)-Technique. XVI. Interactions of Thermal-Energy Electrons with the Molecules HN03 and CI NO} Using the ECR-technique the capture of thermal-energy free electrons was investigated by the molecules HNO3 and CINO3. The following rate constants at room temperature were obtained: Ä.'(HN03) =(1.4 ±0.7)-10-8 cm3 sec-1 ; k (CINO,) = (3.9 ± 1.2)-10-9 cm3 sec-1 . An apparent activation energy of AE = (1.6 ± 0.5) kcal • mol-1 was found for the reaction with CINO3. From the energy dependences of the both reactions together with thermodynamic considera­ tions it is suggested that electron capture by CINO3 occurs via dissociative attachment whereas with HNO3 a negative parent ion can be formed. Strong similarity is pointed out to exist between H0N02 and C10N02 towards capture of electrons and the reaction with 0 2 respectively. 
  Reference    Z. Naturforsch. 39a, 542—547 (1984); eingegangen am 18. Dezember 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0542.pdf 
 Identifier    ZNA-1984-39a-0542 
 Volume    39 
84Author    Fevzi Köksal, Semiha BahçeliRequires cookie*
 Title     
 Abstract    P u ls e d P r o t o n M a g n e t i c R e s o n a n c e S tu d y o f S o m e O r g a n ic C o m p o u n d s Spin-lattice relaxation times (F,) of protons in polycrystalline dimethyl sulfone, stearic acid, stearyl alcohol, trimethylamine-N-oxide, tertiary-butylhydrazine hydrochloride and tertiary-butyl carbamate have been measured over a range of temperatures by pulsed proton magnetic resonance. Except for tertiary-butyl carbamate a single minimum in F, was observed for all the compounds. The F, results have been interpreted by considering the methyl group reorientations about the C3 axis and the role of the spin diffusion of the other protons to the methyl protons in the compounds. The double minima in F, for tertiary-butyl carbamate have been attributed to reorientations of methyl groups in the tertiary-butyl group about the C3 axis and reorientations of each methyl group about its C3 axis. The spin-lattice relaxation parameters have been deter­ mined. 
  Reference    Z. Naturforsch. 39a, 548—552 (1984); received August 6 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0548.pdf 
 Identifier    ZNA-1984-39a-0548 
 Volume    39 
85Author    M. S. Dimitrijević, N.Requires cookie*
 Title      
 Abstract    The simple relations between the Stark broadening parameters and the ionization potential derived by Puric et al. [1] are discussed, and attention is drawn to the serious limitations for their application. The periodic dependence of the Stark width and shift on nuclear charge number obtained by the same authors [2] is also explained. 
  Reference    Z. Naturforsch. 39a, 553—555 (1984); received January 20. 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0553.pdf 
 Identifier    ZNA-1984-39a-0553 
 Volume    39 
86Author    Requires cookie*
 Title     
 Abstract    u m in e s c e n c e o f 5 -P h e n y lte tr a z o le a n d its D e r iv a tiv e s . P a r t II. P h o s p h o r e s c e n c e 
  Reference    Z. Naturforsch. 39a, 556 (1984) 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0556.pdf 
 Identifier    ZNA-1984-39a-0556 
 Volume    39 
87Author    D. Demaison, J. Boucher, A. Burie, DubrulleRequires cookie*
 Title      
 Abstract    The rotational spectrum of ethyl formate has been investigated up to 240 GHz. High J transitions of both a-type and b-type have been measured for the two isomers and fitted to a centrifugally distorted Hamiltonian including some sextic coefficients. The results of the analysis are sufficiently accurate for the prediction of all strong transitions throughout the millimeterwave range. No splitting due to the internal rotation of the methyl group was observed, which indicates that the barrier to internal rotation is of the order of 3 kcal/mole or greater. M illim e te r-W a v e S p e c tr u m o f E th y l F o r m a t e 
  Reference    Z. Naturforsch. 39a, 560—564 (1984); received March 2 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0560.pdf 
 Identifier    ZNA-1984-39a-0560 
 Volume    39 
88Author    I. M. Reda, A. Wagendristel, H. BangertRequires cookie*
 Title     
 Abstract    e s is to m e tric E v id e n c e o f D if fu s io n a l M ix in g in C o n c e n tr a tio n L a y e re d A m o r p h o u s A g C u F ilm s In order to separate diffusion induced changes in the electrical resistivity of quench-condensed amorphous AgCu alloy films from such arising from other causes several trial experiments have been performed. Such films consisting of alternating Ag60Cu40/Ag40Cu60 layers showed a specific resistance rise which revealed the following peculiarities: 1. The duration of this increase is inversly proportional to the square of the individual Ag60Cu40/ Ag^Cu^ couple thickness, 2. The increase is suppressed if rapid heating up to the crystallization temperature is performed and 3. It is not appearing in homogeneous layers. These results give clear evidence that the observed effect is arising from diffusional intermixing onlv. Diffusion coefficients averaged over the annealing period are estimated as D = 8.7 x 10-|5cm2s-' x exp 0.89 eV/kT. 
  Reference    Z. Naturforsch. 39a, 565—570 (1984); received March 7 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0565.pdf 
 Identifier    ZNA-1984-39a-0565 
 Volume    39 
89Author    Barbero, A. Strigazzi2Requires cookie*
 Title     
 Abstract    We analyse Deuling's problem both in the one constant approximation and in the general case. An explicit expression is found for the electric field threshold vs. the crossed applied magnetic field, in the strong anchoring hypothesis. O n D e u lin g 's T r a n s itio n in a N e m a tic L iq u id C r y s ta l* 
  Reference    Z. Naturforsch. 39a, 571—574 (1984); received March 8 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0571.pdf 
 Identifier    ZNA-1984-39a-0571 
 Volume    39 
90Author    G. BarberoRequires cookie*
 Title     
 Abstract    re e d e ric k s z T r a n s itio n in H y b rid A lig n e d N e m a tic L iq u id C ry s ta l C ell We analyse the Freedericksz transition and the flexoelectric deformation in a hybrid aligned nematic liquid crystal cell. We show that the threshold field for the first effect is smaller than that for a homogeneous sample. The calculations are made in the one constant approximation and in the general situation. Furthermore, in the adiabatic approximation we calculated the polarization plane rotation vs. the applied magnetic field, in the one constant approximation. A similar calculation is made for the flexoelectric effect. In particular we show that it is possible to extend the analysis to a situa­ tion of weak anchoring energy. 
  Reference    Z. Naturforsch. 39a, 575—583 (1984); received February 11 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0575.pdf 
 Identifier    ZNA-1984-39a-0575 
 Volume    39 
91Author    GregoryM. Neumann, M. Margaret, PeterJ. Sheil, DerrickRequires cookie*
 Title     
 Abstract    o llis io n -In d u c e d D e c o m p o s itio n o f M u l t i a t o m i c I o n s The dependence upon ion mass of the loss of translational energy suffered by an ion with kiloelectron volt energy as a result of collision with helium has been investigated over the mass range 400 u to 1600 u. At masses below about 1500 u and an incident ion energy of 8 keV, there is forward-scattering in the centre-of-mass frame: at mass 1620 u at the same energy, there is back-scattering in the centre-of-mass frame. The uptake of internal energy by an ion is at a maximum in the region in which the change from forward-scattering to back-scattering occurs. 
  Reference    Z. Naturforsch. 39a, 584—592 (1984); received February 24. 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0584.pdf 
 Identifier    ZNA-1984-39a-0584 
 Volume    39 
92Author    EberhardGerhard Heyne, Jörg Raabe, FleischhauerRequires cookie*
 Title    Ab In itio  
 Abstract    R e c h n u n g e n z u r P r o t o n e n a f f i n i t ä t un v erzw eig ter p r im ä re r a li p h a ti s c h e r A m in e Ab Initio-Calculations on the Protonafßnity of Unbranched Primary Aliphatic Amines Recently we reported the results of semiempirical calculations (MNDO, MINDO/3) which led us to the conclusion, that the proton-affinity of molecules R-NH2 (R = H, CH3, C2H5, n-C3H7 and n-C4H9) is determined by the ability of the groups R to carry positive charge in the corresponding cations R-NH3. We did extend our investigations concerning the protonaffinities of primary aliphatic amines including NH3 and performed ab initio calculations with an STO-3G basis. The results qualitatively parallel those obtained by the semiempirical methods mentioned above. In contrast to the semiempirical results we found that there is a satisfactory correlation between the Mulliken-charges of the nitrogen-atoms and of the NH2-groups and the experimental proton-affinities if NH3 is excluded. 
  Reference    Z. Naturforsch. 39a, 593—595 (1984); eingegangen am 2. April 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0593.pdf 
 Identifier    ZNA-1984-39a-0593 
 Volume    39 
93Author    L. J. Gallego, J. A. AlonsoRequires cookie*
 Title      
 Abstract    The non-random two-liquid (NRTL) theory developed by Renon and Prausnitz has been used to calculate the concentration fluctuations in liquid Na-Cs alloys. The agreement with experi­ ment is better than with other theories used previously. 
  Reference    Z. Naturforsch. 39a, 596—599 (1984); received February 11 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0596.pdf 
 Identifier    ZNA-1984-39a-0596 
 Volume    39 
94Author    S. Janardhanan, C. KalidasRequires cookie*
 Title     
 Abstract    re fe re n tia l S o lv a tio n o f S ilv e r(I) B r o m a te in M e th a n o l-D im e th y ls u lf o x id e M ix t u r e s The solubiltiy of silver bromate, the Gibbs transfer energy of Ag+ and BrO^ and the solvent transport number in methanol-dimethyl sulfoxide mixtures are reported. The solubility of silver bromate increases with addition of DMSO. The Gibbs energy of transfer of the silver ion (based on the ferrocene reference method) decreases, while that of the bromate ion becomes slightly negative with the addition of DMSO. The solvent transport number A passes through a maximum (A = 1.0 at -V DM S0 = 0.65. From these results, it is concluded that the silver ion is preferentially solvated by DMSO whereas the bromate ion shows no preferential solvation. 
  Reference    Z. Naturforsch. 39a, 600—602 (1984); received March 13 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0600.pdf 
 Identifier    ZNA-1984-39a-0600 
 Volume    39 
95Author    E. F. Hefter, I. A. MitropolskyRequires cookie*
 Title      
 Abstract    Inverse methods are applied to the nuclear bound-state problem. Considering only the self-interactions of these states analytical solutions results for potentials and densi­ ties. The simplest possible approximation to the full expression yields immediately AR^(= <>2 (A,-)) — (r2 (A0)) ~ — [B (A,) -B (/4q)] for the differences in the squared nuclear radii as functions of the respective binding ener­ gies per nucleon, B (A,). Inverse Methods and Relative Nuclear Radii 
  Reference    Z. Naturforsch. 39a, 603—604 (1984); received March 30. 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0603_n.pdf 
 Identifier    ZNA-1984-39a-0603_n 
 Volume    39 
96Author    Czeskiw RudowiczRequires cookie*
 Title      
 Abstract    The magnetocrystalline anisotropy theory developed earlier by us and based on a novel energy level model for Fe2~ in YIG:Si(Ge) is used here to study the mechanism of spin reorientation in YIG:Si. Single-ion anisotropy with a uniform distribution of Fe2+ ions indicate a broad spin reorientation which turns out to be due to the higher-order cubic terms K} and KA. It is found that the completion temperature (T2) of the spin reorientation is strongly influenced by Ka thus indicating an inadequacy of the approach based on Kx, K2 and K3 only. From the single Fe-+ ion anisotropy results we propose a two-center model which implies a new mechanism of the spin reorientation in YIG: Si. The bulk onset (77) and completion (T2) temperatures are linked to the relative number (a) of the near Fe2+ sites. Spin orientation diagrams in the plane a — T are established for the total Fe2+—Fe3+ system for a wide range of the parameters involved. The two-center model accounts well for the bulk experimental temperatures T[ and T2 in YIG: Si and for the absence of spin reorientation in samples having Si-content less than 0.18. The total magnetization M is predicted not to rotate smoothly between the [100] and [111] direction. There exists an upper critical angle beyond which M switches sharply to [111] as the temperature approaches T2. Comparison with the previous model which requires a nonuniform distribution of Fe2+ ions is also discussed. 
  Reference    Z. Naturforsch. 39a, 605—614 (1984); received September 20 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0605.pdf 
 Identifier    ZNA-1984-39a-0605 
 Volume    39 
97Author    Ulrich Brändle, Elmar Kammerer, Doris Köhnlein, Otto LutzRequires cookie*
 Title      
 Abstract    Longitudinal relaxation times T, and linewidths of 23Na have been measured in the following tissues of pig: lung, heart, kidney, spleen, liver, and muscle. Tx shows typical values between 12 ms and 25 ms, suitable values for 2 Na NMR imaging. 
  Reference    Z. Naturforsch. 39a, 615—616 (1984); received April 14 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0615.pdf 
 Identifier    ZNA-1984-39a-0615 
 Volume    39 
98Author    F. Rodríguez, M. Moreno, J. C. Gómez, SalRequires cookie*
 Title    M a g  
 Abstract    n e tiz a tio n M e a s u r e m e n ts o n I r o n (I I I) S o l u t i o n s fo r D e te c tin g O lig o m e r F o r m a tio n By measuring the magnetization at low temperatures (near 1 K) and intense magnetic fields 100 KG), information about oligomer formation in ferric salts solutions can be obtained. It is shown that, under rather general conditions, the magnetic moment per ferric ion of a given ferric solution measured in the saturation regime should be equal to 5 ß if all the complexes involved in the solution are high-spin monomers. Moreover, if the solution is mainly composed by monomeric species and antiferromagnetic dimers, the relative concentration of monomeric and dimeric species can easily be determined. This techniques has been applied to solutions of Cl3Fe and (N03)3Fe9H20 in isopropanol as solvent containing about 0.4 M of water. In the first case the present measurements are consistent with the existence of dihydroxo ferric dimers suggested by previous Mössbauer and Optical Absorption data. The relative concentration of these dimers increases from 25% to 50% when the water content increases from 0.4 M to ~ 10 M. In the second case it is confirmed that the solution is mainly composed by oligomers, the relative concentration of monomeric species being less than 30%. 
  Reference    Z. Naturforsch. 39a, 617—622 (1984); received February 29 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0617.pdf 
 Identifier    ZNA-1984-39a-0617 
 Volume    39 
99Author    KamalK. NandiRequires cookie*
 Title     
 Abstract    e n d in g o f A c o u s tic R a y s in a S p h e r ic a lly S y m m e tr ic F ie ld — A C o m p a ris o n w ith S jö d in 's A p p r o a c h * The formula for the bending of acoustic rays in a fluid having a spherically symmetric in­ homogeneity has been obtained without making use of Bouger's theorem. The resulting formula happens to be qualitatively similar to that obtained by Sjödin for the bending of light rays in an inhomogeneous ether. However, a particular difficulty (with a plausible way of resolution) in connection with the quantitative evaluation of the bending of acoustic rays has also been pointed out. In addition, some comments are made regarding the advantages of the adopted approach. 
  Reference    Z. Naturforsch. 39a, 623—625 (1984); received April 6 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0623.pdf 
 Identifier    ZNA-1984-39a-0623 
 Volume    39 
100Author    Seiji MiyashiroRequires cookie*
 Title      
 Abstract    The effect of shock waves on the glow discharge is investigated experimentally. A fast electric discharge is generated across a shock wave for this purpose. The lower pressure around the cathode in front of the shock wave enables electrons to strongly diffuse radially, and therefore the glow is maintained with little constriction even at high average pressures. Moreover, the glow diameter, discharge fluorescence and current are enhanced by the shock wave. G low D is c h a rg e E n h a n c e m e n t by S h o c k W a v e s 
  Reference    Z. Naturforsch. 39a, 626—629 (1984); received November 17 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0626.pdf 
 Identifier    ZNA-1984-39a-0626 
 Volume    39 
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