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  • 1
    Electronic Resource
    Electronic Resource
    Preliminary results on the action of a plant growth regulator (Ethrel) in reducing the attack ofPrays oleae Bern. on olive fruits (1989)
    Springer
    Cellular and molecular life sciences 45 (1989), S. 773-774 
    Details
    ISSN: 1420-9071
    Keywords: Leipidoptera ; Prays oleae ; plant growth regulator ; fruit infestation reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Preliminary experiments carried out in the Granada province of Southern spain over three years and in three different habitats have shown that a single application of Ethrel (2 chloro-ethyl phosphonic acid) to the olive tree at the beginning of fruit formation is sufficient to reduce significantly attack byPrays oleae Bern. and subsequent damage to the fruit. At the same time the treatment did not cause any detrimental change to the trees and had no measurable effect on the activity of beneficial insects such as Chrysopids (Neuroptera), which are known to be importantP. oleae egg predators in the study area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01974586
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  • 2
    Electronic Resource
    Electronic Resource
    Regulatory circuits controlling transcription of TOL plasmid operon encoding meta-cleavage pathway for degradation of alkylbenzoates by Pseudomonas (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 1 (1987), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: TOL plasmid PWWO of Pseudomonas putida contains two operons that specify a pathway for the degradation of aromatic hydrocarbons. The ‘upper’ operon encodes enzymes for the oxidation of toluene to benzoate and xylenes to toluates, whereas the meta-cleavage operon specifies the further oxidation of benzoate and toluates. Transcription of the upper pathway operon (s positively regulated by the XylR protein, which is activated by toluene/xylenes and their alcohol catabolic products, in combination with the NtrA protein, a sigma factor. Expression of the meta-operon is positively controlled by the XylS protein which is activated by meta-pathway substrates, and is Independent of NtrA protein. Expression of the meta pathway is also Induced by toluene/xylene-activated XylR protein via a cascade regulatory system in which this protein in combination with NtrA protein stimulates transcription from the xylS gene promoter. Hyper-production of XylS protein in turn provokes high level expression of the meta-operon, which is independent of meta-pathway substrates. The two promoters, which are activated by the XylR and NtrA proteins, the upper pathway promoter and the xylS gene promoter, exhibit three regions of homology centred at –12(5′–TTGCTÃG–3′), –24(5′ -TGGCPuT –3) and –45(5′-TTAAATÃGPuPuGCGPuTc-3′), with respect to their principal transcription initiation points. The possible physiological significance of activated XylR-protein-induced expression of the meta-operon through amplification of XylS protein levels is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1987.tb01935.x
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetohydrodynamic channel flow study (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 992-997 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A finite-difference study of a steady, incompressible, viscous, magnetohydrodynamic (MHD) channel flow which has direct application to dc electromagnetic pumps is presented. The study involves the numerical solution of the coupled Navier–Stokes and Maxwell equations at low magnetic Reynolds numbers. It is shown that the axial velocity profiles have a characteristic M shape as the fluid approaches and passes the electrode. The electric potential varies almost linearly from the channel centerline to the channel wall. The current shows a steep gradient near the electrodes. Comparison between the finite-difference solution and a quasi-one-dimensional approach are presented. The two-dimensional numerical calculations predict a larger pressure rise, a smaller net current, and a smaller pump efficiency than the quasi-one-dimensional model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865695
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  • 4
    Electronic Resource
    Electronic Resource
    Access to the second stability region in a high-shear, low-aspect-ratio tokamak (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 2674-2682 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is known that tokamaks display a second region of stability to ideal magnetohydrodynamic (MHD) internal modes. An important determining factor for MHD properties is the radial profile of toroidal current. Here it is shown that in a low-aspect-ratio tokamak with high on-axis safety factor (q0(approximately-equal-to)2) and high shear, a path to high beta can be obtained that remains completely stable against ideal MHD modes. By maintaining high shear this scenario avoids fixed boundary instabilities for both high and low toroidal mode numbers for beta values well above the Troyon limit (stability was tested up to εβp=1.4, β=10.8%). For a close fitting wall (awall/aplasma(approximately-equal-to)1.2) this configuration is also stable to low toroidal mode number balloon-kink modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866545
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  • 5
    Electronic Resource
    Electronic Resource
    Polarization effects in the infrared spectra of α-quartz and α-cristobalite (1987)
    Springer
    Physics and chemistry of minerals 14 (1987), S. 527-532 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract The effect of anisotropy and particle shape has been analysed in the infrared powder spectra of α-quartz and α-cristobalite by using theTheory of theAverage Dielectric Constant. Information is obtained regarding the applicability of the theory to these compounds of low polarizability as well as on the contribution of each atom to the vibrational modes. It is shown that the strong tendency of these oxides to adopt a platelike morphology is the reason for the small variability observed in their infrared powder spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308288
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  • 6
    Electronic Resource
    Electronic Resource
    An analysis of laminar boundary layers on liquid curtains (1989)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 40 (1989), S. 721-739 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract A simplified analysis of the laminar boundary layer along an isothermal liquid curtain falling under gravity is presented. The analysis uses a von Kármán-Pohlhausen integral method and includes the effects of gravity, pressure differences, surface tension and nozzle exit geometry on the convergence length of liquid curtains which have applications as chemical reactors and as protection systems in laser fusion reactors. It is shown that the effects of the surrounding gases on the curtain shape and convergence length are small, and that good approximations to the liquid curtain shape can be obtained by using inviscid flow analyses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00945873
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  • 7
    Electronic Resource
    Electronic Resource
    The order of chaos on a Bianchi-IX cosmological model (1986)
    Springer
    General relativity and gravitation 18 (1986), S. 1263-1274 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The purpose of this paper is to analyze the chaotic behavior that can arise on a type-IX cosmological model using methods from dynamic systems theory and symbolic dynamics. Specifically, instead of the Belinski-Khalatnikov-Lifschitz model, we use the iterates of a monotonously increasing map of the circle with a discontinuity, and for the Hamiltonean dynamics of Misner's Mixmaster model we introduce the iterates of a noninvertible map. An equivalence between these two models can easily be brought upon by translating them in symbolic-dynamical terms. The resulting symbolic orbits can be inserted in an ordered tree structure set, and so we can present an effective counting and referentation of all period orbits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00763451
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  • 8
    Electronic Resource
    Electronic Resource
    Electrochemical behaviour of some transition metal oxides in molten dimethylsulphone at 150°C (1986)
    Springer
    Journal of applied electrochemistry 16 (1986), S. 379-386 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract In view of the possible application in non-aqueous líthium cells operating at relatively high temperatures, molten dimethylsulphone (DMSO2) has been used as the electrolyte solvent in lithium cells at 150°C. The stability of lithium in molten DMSO2 has been found to be good as compared with that observed in organic solvents such as propylene carbonate, thus indicating that the Li+/Li system can be used as a suitable reference electrode in this medium. The electrochemical behaviour of some transition metal oxides has been investigated in LIClO4 solutions in molten DMSO2. The results obtained from voltammetric and chronopotentiometric measurements have shown a satisfactory behaviour for all the cathodic materials tested. Moreover, electrochemical insertion of Li+ ions into the crystal lattice of these oxides is a very fast process. Thus molten DMSO2 appears to be a very interesting organic solvent usable in high energy density non-aqueous lithium cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008848
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  • 9
    Electronic Resource
    Electronic Resource
    Molecular shape and orientational order. Effects in the energy of cavity formation in liquids (1989)
    Springer
    Journal of solution chemistry 18 (1989), S. 957-975 
    Details
    ISSN: 1572-8927
    Keywords: Cavity formation ; alkanes ; alkane mixtures ; orientational order ; rotational ordering ; corresponding states principle ; molecular degrees of freedom ; intermolecular interactions ; solution enthalpies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A recently proposed method for calculating the energy of cavity formation in liquids is presented in which the cavity formation process is described as work against the surface forces of the solvent, at the microscopic scale. The energy involved in the cavity formation process is, on the other hand, viewed as a strictly interaction potential energy and the reference cavity, which has the size and the shape of the space occupied by each molecule in the liquid, is considered as having short-range orientational order characteristic of the pure liquid. The method is successfully applied to binary alkane mixtures at infinite dilution whose components have different chemical structure (linear, cyclic and branched alkanes). The importance of the changes in the molecular order of the solute and the solvent occuring in the mixing process is emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647896
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  • 10
    Electronic Resource
    Electronic Resource
    Development and application of an adaptive finite element method to reaction-diffusion equations (1985)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 5 (1985), S. 13-23 
    Details
    ISSN: 0271-2091
    Keywords: Adaptive Finite Element Method ; Combustion ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: An adaptive finite element method is developed and applied to study the ozone decomposition laminar flame. The method uses a semidiscrete, linear Galerkin approximation in which the size of the elements is controlled by an integral which minimizes the changes in mesh spacing. The sizes and locations of the elements are controlled by the location and magnitude of the largest temperature gradient. The numerical results obtained with this adaptive finite element method are compared with those obtained using fixed-node finite-difference schemes and an adaptive finite-difference method. It is shown that the adaptive finite element method developed here using 36 elements can yield as accurate flame speeds as fourth-order accurate, fixed-node, finite-difference methods when 272 collocation points are employed in the calculations.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650050103
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