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1984[X]
41Author    Ivan Gutman, Sherif El-BasilRequires cookie*
 Title     
 Abstract    o p o lo g ic a l P r o p e r tie s o f B e n z e n o id S y stem s. X X IV . C o m p u tin g th e S e x te t P o ly n o m ia l A graph-theoretical method for the calculation of the sextet polynomial is proposed. The method is easy and generally applicable. It is based on the construction of the Clar graph and on the calculation of its independence numbers. 
  Reference    Z. Naturforsch. 39a, 276—281 (1984); received March 1 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0276.pdf 
 Identifier    ZNA-1984-39a-0276 
 Volume    39 
42Author    M. F. Soltwisch, D. Schneider, QuitmannRequires cookie*
 Title      
 Abstract    Quasielastic Rayleigh scattering of 14.4 keV Mössbauer y-radiation has been measured on 1,3-butanediol, yielding the width r of the central line (assumed to be Lorentzian) and its relative intensity, for momentum transfers corresponding to molecular dimensions (A-= 0.9... 2.5 A-1) at 243 K. r(k) rises fast and then saturates. An effective correlation time r and jump width is derived characterizing the diffusional motion of individual molecules considered as entities. Fast motions (vibrations, librations) are taken into account explicitly. The correlation time t compares well with results from other experiments. The temperature dependence was followed from 208 up to 263 K. A M ic ro s c o p ic S tu d y o f M o ti o n s in S u p e r c o o le d 1 ,3 -B u ta n e d io l 
  Reference    Z. Naturforsch. 39a, 282—287 (1984); received November 7 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0282.pdf 
 Identifier    ZNA-1984-39a-0282 
 Volume    39 
43Author    E. RebhanRequires cookie*
 Title      
 Abstract    The nonlinear evolution of external ideal MHD-modes is determined from the equations of ideal MHD by employing a reductive perturbation method which uses a driving parameter for expansion. The reduction of the plasma equations is the same as for internal modes and was treated previously [1]. A main problem arising in addition for external modes is the reduction of the nonlinear boundary conditions. The set of reduced boundary conditions is obtained on the undisplaced boundary in the marginally stable equilibrium position. Another additional problem arises from the fact that the linear MHD operator is only selfadjoint for linear eigenmodes but not for the higher order mode corrections. This complicates the determination of nonlinear amplitude equations for the marginal mode which are obtained from solubility conditions. The amplitude equations are qualitatively the same as for internal modes. Quantitatively, the calcu­ lation of the coefficients in these is different. Explicit expressions for the coefficients are derived in full generality. The effect of higher order corrections to the nonlinear amplitude equations is discussed quantitatively for one of two possible cases and qualitatively for the other. 
  Reference    Z. Naturforsch. 39a, 288—308 (1984); received September 26 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0288.pdf 
 Identifier    ZNA-1984-39a-0288 
 Volume    39 
44Author    J. GruppRequires cookie*
 Title     
 Abstract    u rfa c e F o rc e s o f th e E le c tric F ie ld I n d u c e d F lo w in N e m a tic L iq u id C r y s ta ls In thin nematic liquid crystal films with homeotropic boundaries, surface forces are measured that are produced by an electric field induced flow. The sample is placed between two horizontal circular glass disks in a torsion viscosimeter, where a torque is exerted on the upper disk by these surface forces. The evolution of the induced flow is registered via this torque. The time constants of this evolution, the viscosity term y, -xj^c the elastic constant K} are determined. 
  Reference    Z. Naturforsch. 39a, 309—319 (1984); received December 13. 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0309.pdf 
 Identifier    ZNA-1984-39a-0309 
 Volume    39 
45Author    Shanbingyu, Hans Gronig, StoßwellenlaborRequires cookie*
 Title     
 Abstract    S im p le A p p r o x im a tio n f o r A x ia lly S y m m e tr ic D if f r a c tio n o f P la n e S h o c k s by C o n e s By Whitham's shock dynamics, axially symmetric diffraction problems of plane shocks by cones are reduced to the integration of a system of ordinary differential equations. This paper gives a simpler approach. Approximating the Mach stems by circular arcs, the problems are reduced to the solution of algebraical equations, and the calculating is much simplified. In the cases of small or large cone angles the estimation is even easier. 1. The Differential Equations Based on Whitham's Shock Dynamics 
  Reference    Z. Naturforsch. 39a, 320—324 (1984); received January 28 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0320.pdf 
 Identifier    ZNA-1984-39a-0320 
 Volume    39 
46Author    F. WinterbergRequires cookie*
 Title      
 Abstract    A promising candidate for a near-term low-cost inertial confinement fusion driver is the magnetic booster target concept. In it a small high density magnetically confined plasma and which serves as booster stage, is compressed and ignited by hypervelocity impact. The energy released in the magnetic booster stage, after being transformed into black body radiation, ablatively implodes a high gain second stage target and which releases most of the thermonuclear energy. Alternatively, the energy released in the booster stage can be also used to compress and ignite a target as in impact fusion. The importance of this concept is that it permits to drive the booster stage with a mass accelerator at a velocity of a few 10 km/sec, which is small compared to the velocity required for pure impact fusion, even though it is more than one order of magnitude larger than what can be directly reached with ordinary guns or high explosives. The required velocities can probably be reached by magnetic guns and by fluid dynamic methods through the implosion of cylindrical or spherical shells driven by light gas gun fired projectiles. In comparison to laser-or charged particle beam drivers, the initial driver power is several orders of magnitude smaller and which should lead to a substantial reduction in the driver cost. T h e M a g n e tic B o o s te r T a r g e t I n e r t ia l C o n f in e m e n t F u s io n D riv e r 
  Reference    Z. Naturforsch. 39a, 325—341 (1984); received October 24 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0325.pdf 
 Identifier    ZNA-1984-39a-0325 
 Volume    39 
47Author    B. Uehleke, O. E. RösslerRequires cookie*
 Title      
 Abstract    A variant to the well known Danziger-Elmergreen equation of hormonal regulation is analyzed geometrically by analytical methods. The new method of Poincare half maps is employed. Several chaotic regimes are found. A n a ly tic a l R e s u lts o n a C h a o tic P ie c e w is e -L in e a r O . D . E . 
  Reference    Z. Naturforsch. 39a, 342—348 (1984); received December 21 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0342.pdf 
 Identifier    ZNA-1984-39a-0342 
 Volume    39 
48Author    Robert Klein, Pavel RosmusRequires cookie*
 Title     
 Abstract    a lc u la tio n o f I n f r a r e d T r a n s i t i o n P r o b a b il it ie s f o r th e 12^+ G r o u n d s ta te o f X e Near equilibrium potential energy and dipole moment functions have been calculated for the electronic ground state of the XeH+ ion from highly correlated SCEP/CEPA electronic wavefunc-tions. The following spectroscopic constants for XeH+ are obtained: /?e= 1.611 ±0.005 A, we = 2313 ± 50cm-1, we.ve = 41 ± 5cm~' and D0(Xe+ + H) = 3.90 ± 0.1 eV. Infrared transition dipole matrix elements and probability coefficients for 132XeH+ and 132XeD+ are given. The electric dipole moment functions of the protonated rare gas atoms HeH+ to XeH+ are discussed. 
  Reference    Z. Naturforsch. 39a, 349—353 (1984); received January 24 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0349.pdf 
 Identifier    ZNA-1984-39a-0349 
 Volume    39 
49Author    W. Stahl, E. Fliege, H. Dreizler, R. SchwarzRequires cookie*
 Title     
 Abstract    M ic ro w a v e F o u r ie r T r a n s f o r m S p e c tr o m e t e r fo r th e L o w e r K -b a n d We report on the first experiments with Fourier Transform technique in K-band. Due to the limited performance of some components frequencies up to 20.5 GHz only could be reached. Some 7Vrelaxation measurements are given. 
  Reference    Z. Naturforsch. 39a, 354—356 (1984); received January 25 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0354.pdf 
 Identifier    ZNA-1984-39a-0354 
 Volume    39 
50Author    Robert Becker, Wolfgang Brockner, Herbert SchäferRequires cookie*
 Title    d e s D i-B le  
 Abstract    i-H e x a s e le n o h y p o d ip h o s p h a te s P b 2P 2 S e 6 Crystal Structure and Vibrational Spectra of Pbi PiSe6 * Pb:P2Se6 crystallizes in the monoclinic system, space group Pn (No. 13) with the lattice constants a = 974.2 (4) pm. b = 766.2 (3) pm. c = 689.8 (3) pm, £=91.44(5)°. The title compound is isotypic to the homologous Pb2P2S6. In the structure there are discrete P2Se6_ anions. Far infrared, infrared and Raman spectra of this compound have been recorded. The observed frequencies are assigned on the basis of P2Se6_ units with C2h symmetry in the crystal. DTA-data have been determined and interpreted. K r is ta lls tr u k tu r u n d S c h w in g u n g s s p e k tr e n 
  Reference    Z. Naturforsch. 39a, 357—361 (1984); eingegangen am 24. Januar 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0357.pdf 
 Identifier    ZNA-1984-39a-0357 
 Volume    39 
51Author    Sanesi, Paolo FranzosiniRequires cookie*
 Title    Manlio  
 Abstract    The temperatures and enthalpy changes pertinent to the fusion and clearing processes in the linear cesium alkanoates from tridecanoate to eicosanoate were measured by differential scanning calorimetry. The present information along with data previously taken on the lower homologs allows one to draw the boundaries of the region where cesium soaps can exist in the liquid crystal state. T h e L iq u id C r y s ta l R e g io n in C e s iu m S o a p s 
  Reference    Z. Naturforsch. 39a, 362—365 (1984); received January 20. 1984 
  Published    1984 
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 Identifier    ZNA-1984-39a-0362 
 Volume    39 
52Author    V. Seshu, Bai, Alarich WeissRequires cookie*
 Title      
 Abstract    Bv 79-81 Br apd ,27I NQR spectroscopy 4-(CH3)C6H4NHf Xe , X = Br and I, and 4-(CH3)C6H4ND f 19 were studied in the temperature range' 77 S 7VK ^ 340. The three compounds experience phase transitions, most likely of higher order. Two reversible transitions are observed for the para-toluidinium iodide. 7~i-n being in the temperature range 247 ^ T/K ^ 258. Tn^ m in the range 174 77K $ 179. The deuterated compound shows slight shift of the transition temperatures compared to the protonated one. whereas the l27I-NQR resonance frequencies are considerably lowered as is the nuclear quadrupole coupling constant. The asymmetry parameter tj, however, increases through deuteration of the NH3 group. The room temperature phase of the iodide crystallizes with an orthorhombic space group (Pmmn or Pmn2,.Z = 2). Temperature dependence of the 7vBrNQR spectrum of p-toluidinium bromide indicates a phase transition near t = 281 K. 
  Reference    Z. Naturforsch. 39a, 366—370 (1984); received December 21 1983 
  Published    1984 
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 Identifier    ZNA-1984-39a-0366 
 Volume    39 
53Author    Tetsuo Asaji, Aoki Kazumasa, Daiyu NakamuraRequires cookie*
 Title      
 Abstract    The magnetic susceptibilities of diaquabis(phenoxyacetato)manganese(II), diaquabis(p-chloro-phenoxyacetato)manganese(II), and diaquabis(phenoxyacetato)cobalt(II) were determined in a temperature region below 77 K. The temperature dependence of the magnetic susceptibility observed for the first two manganese(II) complexes shows a broad maximum near 2 K. which can be interpreted as arising from two-dimensional Heisenberg antiferromagnets with S = 5/2. The magnetic susceptibility of the cobalt(II) complex obeys the Curie-Weiss law showing the presence of a ferromagnetic interaction between neighboring cobalt(II) ions. For dia-quabis(phenoxyacetato)manganese(II), a magnetic phase transition from a disordered to an anti-ferromagnetic ordered state was located at 1.633 ± 0.005 K from the sharp maximum of the magnetic susceptibility. M a g n e tic P r o p e r tie s o f D ia q u a b is (p h e n o x y a c e ta t o) m a n g a n e s e (I I) a n d R e la te d C o m p le x e s 
  Reference    Z. Naturforsch. 39a, 371—375 (1984); received November 4. 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0371.pdf 
 Identifier    ZNA-1984-39a-0371 
 Volume    39 
54Author    BerndM. Rode, JumrasP. LimtrakulRequires cookie*
 Title      
 Abstract    Ab initio MO calculations on solvated NaCl adducts are presented. They provide insight into effects to be expected upon oligomerisation of NaCl in aqueous solution or, vice versa, during the last step of the dissolution/solvation process in water. Extrapolation of the data obtained predict the minimal nucleation size for the formation of NaCl crystals to be represented by a (NaClK loo aggregate. Q u a n tu m C h e m ic a l I n v e s tig a tio n s o n S o lv a te d N a C l A d d u c ts 
  Reference    Z. Naturforsch. 39a, 376—380 (1984); received November 25 1983 
  Published    1984 
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 Identifier    ZNA-1984-39a-0376 
 Volume    39 
55Author    Gerhard Raabe, Jörg FleischhauerRequires cookie*
 Title      
 Abstract    Semiempirical Calculations on the Solvent Dependence of the S ^reactivity of Ben:o[l,3]dioxole The highly regiospecific electrophilic substitution of Benzo[l,3]dioxole leads only to the ^-substitution products. Quantumchemical calculations with the semiempirical MNDO-and MINDO/3-methods including the influence of the solvent however suggest that there might be a critical value of the dielectric constant of the solvent above which the a -er-complex formed by the attack of an electrophil (H+ or Cl+) should be energetically more favoured than the cor­ responding /?-<7-complex. 
  Reference    Z. Naturforsch. 39a, 381—385 (1984); eingegangen am 27. Dezember 1983 
  Published    1984 
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 Identifier    ZNA-1984-39a-0381 
 Volume    39 
56Author    Julian Mirek, Andrzej BudaRequires cookie*
 Title     
 Abstract    tu d ie s o n E le c tr o n A ffin ity a n d I o n iz a ti o n P o t e n t i a l s o f P o ly c y a n o D e riv a tiv e s o f s o m e U n s a t u r a t e d H y d r o c a r b o n s a n d B e n z e n e Semiempirical MNDO calculations with optimization of geometry were carried out for several polycyano derivatives of some unsaturated hydrocarbons and benzene. The results show that the MNDO method overestimates the AEA s (adiabatic electron affinity) by about 0.575 eV. as is seen from the equation AEAexp = 0.998 AEAmND0 -0.575; R = 0.9995. It was found that there exists a linear correlation between the energies of LUMO and the AEA's of the investigated compounds: AEA = -1078 LUMO + 0.387; R = 0.9979 for 40 points. MNDO does not show a linear correlation of AEA with IP (ionization potential). Generally, with increasing number of cyano substituents in unsaturated hydrocarbons the energy of HOMO and LUMO decreases, but this may not necessarily be true for higher molecular orbitals. 
  Reference    Z. Naturforsch. 39a, 386—390 (1984); received December 13. 1983 
  Published    1984 
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 Identifier    ZNA-1984-39a-0386 
 Volume    39 
57Author    F. H. Abd, El-Kader, H. M. AhmedRequires cookie*
 Title     
 Abstract    isso c ia tiv e I o n iz a tio n a n d M e t a s t a b l e I o n s o f N itr o b e n z e n e a n d N itro b e n z e n e -d 5 The kinetica energy released on the loss of CN02 from nitrobenzene and deuterated nitro­ benzene ions in the second field-free region shows that this loss does not occur as a single-step process. The apparent heat of formation of the QH5 ion is found to be 270.85 kcal mol-1, which is consistent with the ion having the cyclic structure. 
  Reference    Z. Naturforsch. 39a, 391—394 (1984); received December 13 1983 
  Published    1984 
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 Identifier    ZNA-1984-39a-0391 
 Volume    39 
58Author    N. CaranicolasRequires cookie*
 Title    A Second Integral of Motion in a Triaxial Galaxy  
 Abstract    We construct a formal second integral of motion in a bisymmetrical potential field describing the motion on the plane of symmetry of a triaxial galaxy. We also check the constancy of the second integral adding higher-order terms which are found using a computer program. 
  Reference    Z. Naturforsch. 39a, 395—396 (1984); received January 5 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0395_n.pdf 
 Identifier    ZNA-1984-39a-0395_n 
 Volume    39 
59Author    M. ZanderRequires cookie*
 Title    Zur Konzentrationsabhängigkeit der Benzophenon- sensibilisierten Naphthalin-Phosphoreszenz in einem Kohlenwasserstoff-Glas bei 77 K  
 Abstract    On the Concentration Dependence of the Benzophenone-sensitized Naphthalene Phosphorescence in a Hydrocarbon Glass at 77 K The variation of intensity of the benzophenone-sensitized naphthalene phosphorescence with naphthalene concentra­ tion is different in a hydrocarbon or ethanol-ether glass, respectively. The naphthalene phosphorescence quenching observed in the hydrocarbon glass at higher naphthalene concentrations is assumed to result from the formation of non-phosphorescent naphthalene aggregates in benzo-phenone microcrystals. 
  Reference    Z. Naturforsch. 39a, 397—398 (1984); received February 17 1984 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0397_n.pdf 
 Identifier    ZNA-1984-39a-0397_n 
 Volume    39 
60Author    *. M. BubackRequires cookie*
 Title     
 Abstract    p e c tro s c o p ic In v e s tig a tio n o f th e H ig h P r e s s u r e E th y le n e P o ly m e r iz a tio Quantitative absorption spectroscopy in the infrared and near-infrared region enables kinetic and thermodynamic investigations to be performed on systems at high temperatures and pressures. The technique is illustrated for the ethylene polymerization. From spectroscopic experiments up to 3 kbar at maximum temperatures of 250 °C, the rate equations of the thermally, of the photochemically, and of the chemically initiated polymerization are deter­ mined. 
  Reference    Z. Naturforsch. 39a, 399—411 (1984); received December 24. 1983 
  Published    1984 
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 TEI-XML for    default:Reihe_A/39/ZNA-1984-39a-0399.pdf 
 Identifier    ZNA-1984-39a-0399 
 Volume    39 
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