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1984[X]
161Author    Shanbing Yu, Rheinisch-Westfälische Stoßwellenlabor, Hochschule Technische, AachenRequires cookie*
 Title     
 Abstract    sy m p to tic S o lu tio n N e a r F o c u s o f a T w o -d im e n s io n a l S h o c k an d In s ta b ility N e a r A x is o f a C y lin d r ic a l S h o c k w ith C C W A p p ro a c h The Chester-Chisnell-Whitham equations in Cartesian and polar coordinates are written out for the two-dimensional case. The solution expanded near a point is obtained. The asymptotic solutions of order 2 near focus are presented. Linear small perturbation analysis for a converging cylindrical shock is given. To study the development of perturbations numerical solutions are carried out. 1. The Shock Dynamics and CCW Approach 
  Reference    Z. Naturforsch. 39a, 1011—1022 (1984); received July 30 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1011 
 Volume    39 
162Author    PhilipJ. Morrison, I L Caldas, H. TassoRequires cookie*
 Title      
 Abstract    Gyroviscous MHD in two dimensions is shown to be a Hamiltonian field theory in terms of a non-canonical Poisson bracket. This bracket is of the Lie-Poisson type, but possesses an unfamiliar inner Lie algebra. Analysis of this algebra motivates a transformation that enables a Clebsch-like potential decomposition that makes Lagrangian and canonical Hamiltonian formulations possible. H a m ilto n ia n F o rm u la tio n o f T w o -D im e n s io n a l G y ro v is c o u s M H D 
  Reference    Z. Naturforsch. 39a, 1023—1027 (1984); received August 9. 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-1023.pdf 
 Identifier    ZNA-1984-39a-1023 
 Volume    39 
163Author    G. SüssmannRequires cookie*
 Title      
 Abstract    With a view on nuclear matter, the continuity between the solid and the liquid states of a material is discussed. For such a viscoelastic medium an acoustical analogue of the Kramers-Kronig relation of linear optics is derived. 
  Reference    Z. Naturforsch. 39a, 1028—1034 (1984); received July 30 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1028 
 Volume    39 
164Author    Ajeksander Baiter, Olaf RolińskiRequires cookie*
 Title     
 Abstract    x c ite d -s ta te R e a c tio n s o f 4 -m e th y lu m b e llif e r o n e S tu d ie d by N a n o s e c o n d F lu o r o m e tr y Excited-state protolytic reactions of 4-methylumbelliferone were studied using pulse and phase fluorometry. A concept of internal convolution which simplifies the data analysis was applied. The fluorescence decay of the excited neutral species was found to be monoexponential, while the decay of the long-wavelength emitting species (most probably a zwitterion) is biexponential. An excited-state reactions model is proposed, in which the rapidly dissociating cation is an intermediate between the neutral and zwitterionic species. 
  Reference    Z. Naturforsch. 39a, 1035—1040 (1984); received July 31. 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1035 
 Volume    39 
165Author    A. Piel, J. SlupekRequires cookie*
 Title      
 Abstract    Using a pulsed linear discharge of high purity, Stark broadened profiles of the first two Balmer lines and the Paschen-a line of Hell have been investigated. The electron density (Ne = 5.5 • 1022 m"3) was measured with a coupled cavity He-Ne laser interferometer. The inten­ sity ratio of the Hell 468.6 nm and the Hel 471.3 nm line was employed to determine the electron temperature (7~e = 3.8 eV). At these plasma parameters the measured ion lines are unaffected by self absorption. This enables direct comparison with existing theories. Discrepancies between experimental and theoretical line shapes are critically discussed. Fine structure effects, usually neglected in theories, turn out to be important for the Balmer-a line. 
  Reference    Z. Naturforsch. 39a, 1041—1048 (1984); received August 16. 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-1041.pdf 
 Identifier    ZNA-1984-39a-1041 
 Volume    39 
166Author    A. Bernard, R. GravinaRequires cookie*
 Title     
 Abstract    n th e In fra re d A 2/7j — X 2I + S y s te m o f A lu m in iu m M o n o x id e in R e la tio n w ith th e S p e c tr a o f M G i a n t-a n d M ir a -T y p e S t a r s From combinations between known ultraviolet transitions of the AlO molecule line positions in the A:/7, — X2Z"+ system are tentatively proposed. Indeed, the available data on the C2/7r -> X2Z"+ and C:/7r -* A2/7, transitions permit us to derive about 2400 energy level differences in the A-X system corresponding to the six r-connected bands 0-0, 0-1, 0-2, 1-0, 1-1 and 1— 2. A unique and consistent set of rovibrational constants is derived from a global fitting, allowing to reproduce the observed differences with a total standard deviation of 0.053 cm"'. A catalogue of vacuum line wavenumbers in the six bands is generated and can be made available on request. The synthetic spectra are expected to represent properly the true spectra at least up to J ~ 35.5 and can therefore be of usefulness for the detection of the system in the spectra of M giant-and Mira-type stars. Franck-Condon factors and r-centroi'ds appropriate to RKR potentials and estimates of intensities in emission are given for bands up to r' = 5, v" = 8. More reliable values for the internal partition functions and dissociation constants of AlO are computed for temperatures between 1000 and 8000 K. All the known and predicted electronic states are taken into account, and present or recent values for the molecular parameters and dissociation energy are used. 
  Reference    Z. Naturforsch. 39a, 1049—1055 (1984); received May 16 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1049 
 Volume    39 
167Author    O. Claesson, A. LundRequires cookie*
 Title      
 Abstract    An alkyl radical-iodide anion adduct . CD3... I"" has been detected in y-irradiated 12CD3I and ,3CD3I by ESR measurements on single crystals at 77 K. The species has hyperfine couplings of A = 80 • 9 G. A± = 39 G with l27I and A ='80 G. A± = 20 G with 13C. By comparison with INDO calculations it is concluded that the . CD3 group is planar with the I" ion at a distance of ca. 3 A and located on the . CD3 three-fold axis. 
  Reference    Z. Naturforsch. 39a, 1056—1060 (1984); received August 16 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1056 
 Volume    39 
168Author    E. BuluggiuRequires cookie*
 Title    E P R D a  
 Abstract    ta on N i(II) D o p e d C u (I I) A c e ta te M o n o h y d r a t e S in g le C ry s ta ls : E v id e n c e o f N i2+ —C u 2+ E x c h a n g e -C o u p le d P a i r s Electron paramagnetic resonance measurements on nickel(II) doped copper(II) acetate mono-hydrate single crystals have been made. In the liquid helium temperature range, spectra have been observed which may be assigned to Ni2+-C u2+ strongly coupled mixed pairs in the state of total spin S= 1/2. This result represents a definite difference of magnetic behaviour from the case of the nickel(II) doped dicopper(II) tetra(J u-benzoato-0.0')bis(quinoline) complex, which has the same sandwich dimeric structure but shows spectra indicative of a S=3/2 state. Apart from this difference, unusual EPR data are found such as pronounced misalignments of g with respect to the relevant pair axes and very large values of the hyperfine coupling constant of the copper nucleus, which characteristically recall that case. 
  Reference    Z. Naturforsch. 39a, 1061—1065 (1984); received April 8 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1061 
 Volume    39 
169Author    G. Barbero, N. V. Madhusudana, G. DurandRequires cookie*
 Title     
 Abstract    n c h o rin g E n e rg y f o r N e m a tic L iq u id C r y s ta ls a n A n a ly sis o f th e P r o p o s e d F o r m s We analyze the proposed functional forms describing the surface anchoring energy of MBBA nematic liquid crystal. Measurements of the surface torque versus tilt angle suggest that the simple cosinus-square form is not adequate for MBBA. The generalized form in an infinite series in cosinus-square is not useful since the set of functions is not orthogonal. Analyses using the orthogonal Legendre polynomials and Fourier expansion are given. Finally we analyse the data in terms of small tilt angles compared to the easy axis, and very far from it, which are the two limits of practical interest. 
  Reference    Z. Naturforsch. 39a, 1066—1076 (1984); received August 2 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1066 
 Volume    39 
170Author    G., A. Mikšovsky, H. Rauch, E. Seidl, W. WächterRequires cookie*
 Title     
 Abstract    rd e r-D is o rd e r T r a n s i t io n s in th e V a n a d iu m -H y d r o g e n S y s te m M e a s u re d by P e r f e c t-C r y s ta l N e u t r o n S m a ll-A n g le S c a tt e r i The solubility limits for hydrogen in vanadium were determined using small-angle neutron scattering. In addition, the neutron transmission in dependence of the hydrogen concentration at 170 °C (pure x-phase) and at 20 °C (x + /?-phase) was measured. The total cross section of the proton in the x-phase was found to be nearer to the free than to the bound value. The Guinier-approximation is used to examine the small-angle scattering of precipitates in the /?-phase V2H. The features of perfect-crystal neutron small-angle scattering for the precise transmission measurement and for the investigation of the very small (7-range are demonstrated. 
  Reference    Z. Naturforsch. 39a, 1077—1081 (1984); received July 31. 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1077 
 Volume    39 
171Author    WolfgangBurghard Schleker, Wilhelm Schmidt, Jörg Mertens, FleischhauerRequires cookie*
 Title    E in e in  
 Abstract    f a c h e s I n k r e m e n te n v e r f a h r e n z u r B e s tim m u n g d e r L a d u n g e n in n i c h t a r o m a t i s c h e n M o le k ü le n A Simple Incremental Scheme for the Determination of Charges in Nonaromatic Molecules A quick and very simple scheme for the determination of atomic charges in molecules from those of a set of precalculated (MNDO) molecules is presented. These charges are compared with those obtained by complete MNDO calculations of some molecules. 
  Reference    Z. Naturforsch. 39a, 1082—1088 (1984); eingegangen am 20. August 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-1082.pdf 
 Identifier    ZNA-1984-39a-1082 
 Volume    39 
172Author    Klaus Müller-Dethlefs, Michael Sander, EdwardW. SchlagRequires cookie*
 Title     
 Abstract    N o v el M e th o d C a p a b le o f R e s o lv in g R o t a t i o n a l I o n ic S t a t e s by th e D e te c tio n o f T h r e s h o ld P h o t o e l e c t r o n s w ith a R e s o lu tio n o f 1.2 cm " 1 A novel method for the unambiguous direct determination of ionization potentials is presented. This is done by combining a pulsed field technique with a steradiancy analyser for the detection of threshold electrons. For now a resolution of better than 0.15 meV is demonstrated by resolving the first three rotational states of NO+. 
  Reference    Z. Naturforsch. 39a, 1089—1091 (1984); received September 3 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1089 
 Volume    39 
173Author    W. H. Stolze, D. H. SutterRequires cookie*
 Title     
 Abstract    o le c u la r E le c tric Q u a d r u p o le M o m e n t , M a g n e tic S u s c e p tib ility T e n s o r a n d D e u te riu m Q u a d r u p o le C o u p lin g C o n s t a n t in C y a n o a c e ty le n e The rotational Zeeman effect in the J -> J' = 0 1 and 1 -»■ 2 rotational transitions has been observed for H-C = C -C = I4N, D-C = C -C = 14N, D -C = C -C = 15N, and H -C ^ C -C = 15N using a microwave bridge superheterodyne spectrometer. From the experimental <7±-values, susceptibility anisotropies and rotational constants, the molecular electric quadrupole moment, which plays an important role for collisional excitation and relaxation, follows as Q =2.14(9) x 10~26esu cm2 (referred to the center of mass of the H— C = C — C= 14N species). Since the Deuterium quadrupole hyperfine splittings in the Zeeman spectra could be resolved, it was also possible to fit the Deuterium quadrupole coupling constant. Our value, eqQ (2H) = 198.2(46) kHz is about 10% smaller than the value derived from a recent high resolution micro­ wave Fourier transform study. The reasons for this discrepancy are discussed. All experimental molecular parameters are compared to the results of ab initio quantum chemical calculations and it is argued that the 14N nuclear electric quadrupole moment is possibly about 30% larger than presently assumed. 
  Reference    Z. Naturforsch. 39a, 1092—1103 (1984); received August 30. 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-1092.pdf 
 Identifier    ZNA-1984-39a-1092 
 Volume    39 
174Author    E. Fliege, H. Dreizler, A. P. Cox, S. D. HubbardRequires cookie*
 Title     
 Abstract    u a d ru p o le H y p e rfin e S t r u c t u r e o f th e D ire c t /-T ype D o u b lin g S p e c tru m o f H y d r o g e n C y a n id e by M ic r o w a v e F o u r ie r T ra n s fo rm S p e c tr o s c o p y The direct /-type doublet transitions for v2 = 1 of HCN. DCN and DCI5N have been measured between 4 and 16 GHz under very high resolution by microwave Fourier transform spectroscopy. Analysis of the nitrogen-14 hyperfine structure of the transitions of HCN and DCN has required an extension of the Hamiltonian previously used. Accurate values of the /-type doublet constants are reported. 
  Reference    Z. Naturforsch. 39a, 1104—1107 (1984); received September 3 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1104 
 Volume    39 
175Author    Michael PalmerRequires cookie*
 Title      
 Abstract    ,4N N u c le a r Q u a d r u p o le C o u p lin g in G ly c y l-G ly c in e a n d R e la te d P e p tid e s An ab initio calculation of double zeta quality on glycyl-glycine at the crystal structure yielded nuclear quadrupole coupling constants at the peptide centres very close to experiment; yzz — 3.03, XyV + 2.14, /.v. v + 0.89 MHz. The first two couplings lie in the local jr-direction, and along the C-N bond, respectively. At the NHf centre the values were less satisfactory, but the (low) positive value of was obtained, and lies relatively close to the N -C bond. The results suggest that similar calculations may be successful for other H-bonded systems, provided that aromatic systems are not involved. 
  Reference    Z. Naturforsch. 39a, 1108—1111 (1984); received August 24 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1108 
 Volume    39 
176Author    Z. NaturforschRequires cookie*
 Title      
 Abstract    An NMR study was made of the ll5In nucleus in InCl. InCl2, InCl3 and in a mixture InCl3 + NaCl. Chemical shifts and line-widths as a function of temperature were recorded in the molten state for all samples except InCl3. As regards InCl2, NMR results gave little support to the generally held view that InCl2 is In^WC^) rather than ( 
  Reference    Z. Naturforsch. 39a, 1112—1114 (1984); received July 30 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1112 
 Volume    39 
177Author    R. Braun, S. Kemmler-SackRequires cookie*
 Title      
 Abstract    Sensitized IR Emission of the Trivalent Rare Earths in S/3La2 W 20 l2 By activation of the host lattice Sr3La2W20 12 with the trivalent rare earth ions Nd, Ho, Er, Tm and Yb an intense IR emission is observed, which can be sensitized by energy transfer from Nd3+ to Yb3+, from Er3+ to Ho3+ or Tm3+, from Tm3+ to Ho3+, and from Yb3+ to Ho3+ or Tm3+. For all other couples of trivalent rare earth ions no significant energy transfer is detected. 
  Reference    Z. Naturforsch. 39a, 1115—1119 (1984); eingegangen am 15. August 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1115 
 Volume    39 
178Author    Robert Becker, Wolfgang BrocknerRequires cookie*
 Title    R a m a n  
 Abstract    -S p e k tre n v o n g e s c h m o lz e n e m T h a l l i u m h e x a t h i o m e t a -d ip h o s p h a t T12P 2 S 6 Raman Spectra of Molten TI2P2Sf) Raman spectra of molten T12P2S6 and of Alkali bromide-Tl2P2S6 melt mixtures have been recorded. The spectra are interpreted from the temperature dependent dimer-monomer equilib--i S rium P2Sg" ^ 2 PSj. We propose the planar structure (D3h symmetry) with dereali­ zation of charge for the uncommon PSj anion. It is pointed to an analogy of P2S;i;~ and the iso-electronic A12C16. Lewis acid-base equilibria are formulated for molten Me2S-phosphorus sulfide systems. 
  Reference    Z. Naturforsch. 39a, 1120—1121 (1984); eingegangen am 31. August 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1120 
 Volume    39 
179Author    A. A. Kornyshev, +., M. B. Partenskii, W. SchmicklerRequires cookie*
 Title    S e lf  
 Abstract    C o n s is te n t D e n s ity F u n c t io n a l A p p r o a c h to a M e ta l /E l e c t r o ly t e S o lu tio n I n te r f a c e Two models for a plane interface between a free electron metal and a concentrated solution of a surface inactive electrolyte are treated fully self-consistently, taking into account both the polarizability of the metallic electron cloud and' the reorientation of solvent molecules. The inter-facial capacity is calculated as a function of the electrode charge, and its dependence on various system parameters is investigated. Some conclusions on the structure of the interface are drawn from a comparison between our results and experimentally observed trends. 
  Reference    Z. Naturforsch. 39a, 1122—1133 (1984); received May 16. 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-1122 
 Volume    39 
180Author    O. Llis Io, Andrzej KowalskiRequires cookie*
 Title      
 Abstract    Strong UV and weak visible continua of Zn2, Cd2 and ZnCd have been observed in emission when a discharge-excited atomic beam of zinc or cadmium is crossed with an unexcited beam of zinc or cadmium. It has been found that the discharge-excited beams of Zn and Cd contain also atoms in autoionizing states with lifetimes equal to (140 ± 30) and (110 ± 20) |isec, respectively. 
  Reference    Z. Naturforsch. 39a, 1134—1141 (1984); received July 17 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-1134.pdf 
 Identifier    ZNA-1984-39a-1134 
 Volume    39 
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