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  • 1
    Electronic Resource
    Electronic Resource
    Théorèmes du type Bertini en caractéristique positive (1995)
    Springer
    Archiv der Mathematik 64 (1995), S. 209-215 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01188571
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  • 2
    Electronic Resource
    Electronic Resource
    Equivariant K-Theory of Compact Connected Lie Groups Dedicated to Daniel Quillen on the Occasion of his Sixtieth Birthday (2000)
    Springer
    K-Theory 20 (2000), S. 23-36 
    Details
    ISSN: 1573-0514
    Keywords: equivariant K-theory ; compact Lie groups ; Grothendieck differentials ; representation ring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We compute the equivariant K-theory K G * (G)for a compact connected Lie group Gsuch that π1 (G)is torsion free (where Gacts on itself by conjugation). We prove that K G * (G)is isomorphic to the algebra of Grothendieck differentials on the representation ring. We also study a special example of a compact connected Lie group Gwith π1 (G)torsion, namely PSU(3), and compute the corresponding equivariant K-theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007824116324
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  • 3
    Electronic Resource
    Electronic Resource
    Universal birefringent filter with a new double passband mode (1995)
    Springer
    Solar physics 161 (1995), S. 229-239 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This article describes the universal birefringent filter (UBF) which will be mounted at Taiwan. The UBF permits observations of solar images, vector magnetic fields and/or line-of-sight velocity fields in any Fraunhofer line in the wavelength region from 4000 Å to 7000 Å with half width from 0.05 Å to 0.14 Å. We have tested it at ten Fraunhofer lines under a spectral telescope in Huairou Station of Beijing Astronomical Observatory and obtained the passband profiles. The principles of magnetic field and velocity field measurement with the UBF are also described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00732068
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  • 4
    Electronic Resource
    Electronic Resource
    Functional domain analysis of the Saccharomyces MAL-activator (1999)
    Springer
    Current genetics 36 (1999), S. 1-12 
    Details
    ISSN: 1432-0983
    Keywords: Key wordsMAL-activator ; Maltose fermentation ; Saccharomyces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract MAL63 of the MAL6 locus and its homologues at the other MAL loci encode transcription activators required for the maltose-inducible expression of the MAL structural genes. We carried out a deletion analysis of LexA-MAL63 gene fusions to localize the functional domains of the Mal63 MAL-activator protein. Our results indicate that the sequence-specific DNA-binding domain of Mal63p is contained in residues 1–100; that residues 60–283 constitute a functional core region including the transactivation domain; that residues 251–299 are required to inhibit the activation function of Mal63p; and that the rest of the C-terminal region of the protein contains a maltose-responsive domain that acts to relieve the inhibitory effect on the activation function. Abundant overproduction of Mal63p does not overcome the negative regulation of MAL gene expression in the absence of maltose, suggesting that a titratable MAL-specific repressor similar to Gal80p is not involved in the negative regulation of the MAL-activator. A model for maltose-inducible autoregulation of the MAL-activator is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050466
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  • 5
    Electronic Resource
    Electronic Resource
    Alterations in the Saccharomyces MAL-activator cause constitutivity but can be suppressed by intragenic mutations (2000)
    Springer
    Current genetics 38 (2000), S. 233-240 
    Details
    ISSN: 1432-0983
    Keywords: Key wordsMAL-activator ; Constitutive mutations ; Maltose fermentation ; Saccharomyces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Saccharomyces MAL-activator regulates the maltose-inducible expression of the MAL structural genes encoding maltose permease and maltase. Constitutive MAL-activator mutant alleles of two types were identified. The first were truncation mutations deleting C-terminal residues 283–470 and the second contained a large number of alterations compared to inducible alleles scattered throughout the C-terminal 200 residues. We used site-directed in vitro mutagenesis of the inducible MAL63 and MAL63/23 genes to identify the residues responsible for the negative regulatory function of the C-terminal domain. Intragenic suppressors that restored the inducible phenotype to the constitutive mutants were identified at closely linked and more distant sites within the MAL-activator protein. MAL63/mal64 fusions of the truncated mutants suggest that residues in the N-terminal 100 residues containing the DNA-binding domain also modulate basal expression. Moreover, a transcription activator protein consisting of LexA(1–87)-Gal4(768–881)-Mal63(200–470) allowed constitutive reporter gene expression, suggesting that the C-terminal regulatory domain is not sufficient for maltose-inducible control of this heterologous activation domain. These results suggest that complex and very specific intramolecular protein–protein interactions regulate the MAL-activator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940000161
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  • 6
    Electronic Resource
    Electronic Resource
    Constraints of the KP hierarchy and multilinear forms (1995)
    Springer
    Communications in mathematical physics 168 (1995), S. 117-135 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We consider the trilinear form of the Kaup-Broer system which gives rise to solutions in Wronskian form. The Kaup-Broer system is connected with AKNS system through a gauge transformation. The AKNS hierarchy can be understood as a generalized 1-constraint of the KP hierarchy. Imposing that constraint on Sato's equation we obtain the basic trilinear form and moreover a hierarchy of trilinear equations governing the AKNS flows. Similary, hierarchies of multilinear forms are derived in the case of generalized k-constraints.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02099585
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  • 7
    Electronic Resource
    Electronic Resource
    Properties of curved laminated veneer lumber made from fast-growing species with radiofrequency heating for use in furniture (1998)
    Springer
    Journal of wood science 44 (1998), S. 275-281 
    Details
    ISSN: 1611-4663
    Keywords: Fast-growing species ; Curved LVL ; Radiofrequency heating ; Property
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Curved laminated veneer lumber (LVL) is manufactured from glue-coated pieces of rotary-cut veneers assembled and pressed between molds. In this study, curved LVLs were produced from two fast-growing wood species such as massion pine (Pinus massoniana Lamb.) and poplar (Populus euramericana CV. I.) for use in furniture. In addition to the applicability of the two wood species used, the optimum technological conditions of curved LVL production with radiofrequency (RF) heating and the physical and mechanical properties of curved LVL were investigated. The results are as follows: (1) Curved LVL made from massion pine and fast-growing poplar shows excellent mechanical properties. These fast-growing wood species are suitable for curved LVL being used as furniture structural members. (2) The mechanical properties of curved LVL are affected by frequency, voltage, RF application time, and moisture content, with the RF application time and moisture content having more important effects on the mechanical properties than the frequency and the voltage. (3) The mechanical properties of curved LVL increase with a linear increase in the density of curved LVL.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00581307
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  • 8
    Electronic Resource
    Electronic Resource
    A Cherenkov Oscillator Operating at Two Different Wave Bands (1999)
    Springer
    International journal of infrared and millimeter waves 20 (1999), S. 83-92 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A Cherenkov oscillator operating simultaneously at two different wave bands (3cm and 8mm) is described in this paper. Experimental results from the oscillator are reported. The measured output power is 10 MW at 3cm wave band, and 1MW at 8mm wave band. The operating modes for BWO and R-orotion are E 01 and E 13, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021755718537
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  • 9
    Electronic Resource
    Electronic Resource
    Low temperature vapor-phase preparation of TiO2 nanopowders (1999)
    Springer
    Journal of materials science 34 (1999), S. 3505-3511 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The preparation of TiO2 nanopowders by vapor-phase hydrolysis of TiCl4 below 600°C is studied in this paper. Influences of preparation variables, such as preparative temperature, residence time, reactant concentration, and H2O/TiCl4 mole ratio, on TiO2 particle size, morphology and chlorine contamination are investigated, followed by discussion. It shows that the hydrolysis temperature exerts greatest influences, while the residence time hardly have impact on product particles below 400°C, among the hydrolysis variables investigated. The chlorine contamination on nanopowders occurs during the preparation which can be greatly reduced by proper control on preparation variables. Unlike the high temperature gas-phase processes such as oxidation route and flame synthesis, low-temperature route shows the ready control on product powders, and thus obtains titania powders with small size, narrow size distribution and very weak agglomeration. In addition, the decreased energy consumption, retarded corrosion on the reactor and the reduced operation problems would be expected for the low temperature processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004666106670
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  • 10
    Electronic Resource
    Electronic Resource
    Unsafe operations in B-trees (1989)
    Springer
    Acta informatica 26 (1989), S. 421-438 
    Details
    ISSN: 1432-0525
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Summary A simple mathematical model for analyzing the dynamics of a B-tree node is presented. From the solution of the model, it is shown that the simple technique of allowing a B-tree node to be slightly less than half full can significantly reduce the rate of split, merge and borrow operations. We call split, merge, borrow and balance operations unsafe operations in this paper. In a multi-user environment, a lower unsafe operation rate implies less blocking and higher throughput, even when tailored concurrency control algorithms (e.g., that proposed by Lehman and Yao [10]) are used. A lower unsafe operation rate also means a longer life time of an optimally initialized B-tree (e.g., compact B-tree). It is in general useful to have an analytical model which can predict the rate of unsafe operations in a dynamic data structure, not only for comparing the behavior of variations of B-trees, but also for characterizing workload for performance evaluation of different concurrency control algorithms for such data structures. The model presented in this paper represents a starting point in this direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00289145
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