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  • 1980-1984  (78)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 67 (1980), S. 192-192 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 69 (1982), S. 194-196 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Applied mathematics & optimization 9 (1982), S. 263-290 
    ISSN: 1432-0606
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper we are concerned with the approximate solution of time-optimal control problems in a nonreflexive Banach SpaceE by sequences of similar problems in Banach spacesE n which are assumed to approximateE in a fairly general sense. The problems under consideration are such that the solution operator of the associated evolution equation is a strongly continuous holomorphic contraction semigroup and the class of controls is taken from the dual of the Phillips adjoint space with respect to the infinitesimal generator of that semigroup. The main object is to establish convergence of optimal controls, transition times and corresponding trajectories of the approximating control problems which can be done by means of some results from the theory of approximation of semigroups of operators. Finally, these abstract convergence results will be applied to time-optimal control problems arising from heat transfer and diffusion processes.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 69 (1982), S. 447-447 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 71 (1984), S. 264-265 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 464 (1980), S. 240-254 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Knowledge of RbTaO3 - a New Type of a Layer StructureRbTaO3 crystallizes monoclinic with a = 9.589, b = 8.505, c = 8.135 Å, β = 94.87°, Z = 8, space group C2/m. The crystal structure (Fourcircle-diffractometer data, 4° ≤ Θ ≤ 33°, 1014 hkl, MoKα, R = 9,9%) shows sheets ∞2[TaO3] connected by Rb; one half of Ta is surrounded by O octahedrally, the other part tetragonal-pyramidal. Effective Coordination Numbers, ECoN, and the Madelung Part of Lattice Energy, MAPLE, have been calculated and are discussed.
    Notes: RbTaO3 kristallisiert monoklin mit a = 9, 589, b = 8, 505, c = 8,135 Å, β = 94,87°, Z = 8, Raumgruppe C2/m. Nach der Strukturaufklärung (Vierkreisdiffraktometerdaten, 4° ≤ Θ ≤ 33°. 1014 hkl, MoKα, R = 9,9%) liegen über Rb verknüpfte ∞2[TaO3]-Schichten vor, in denen Ta je zur Hälfte oktaedrisch und tetragonal-pyramidal von O umgeben ist. Effektive Koordinationszahlen, ECoN, sowie der Madelunganteil der Gitterenergie, MAPLE, werden berechnet und diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 471 (1980), S. 131-139 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On New Elpasolithes of the Rare Earth MetalsCubic Elpasolithes of Rare Earth Metals Cs2ASEF6 with A=Na, K, Rb have been prepared partly by direct fluorination of the chlorides Cs2ASECl6, partly by heating appropiate mixtures of the binary fluorides. The lattice constants are discussed. The parameter xF which rules the structural properties is determined by calculations of the Madelung Part of Lattice Energy, MAPLE. Is is shown that the values so obtained are self-consistent.
    Notes: Kubische Elpasolithe der Seltenen Erden Cs2ASEF6 mit A=Na, K, Rb wurden teils durch direkte Fluorierung der Chloride Cs2ASECl6, teils durch Tempern inniger Gemenge der entsprechenden binären Fluoride dargestellt und röntgenographisch untersucht. Die Gitterkonstanten (siehe Text) werden diskutiert. Der strukturbestimmende Parameter, xF, wird mit Hilfe von Berechnungen des Madelunganteiles der Gitterenergie, MAPLE, bestimmt und gezeigt, daß die so gewonnenen Werte in sich konstant sind.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 485 (1982), S. 15-22 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Oxostannates(II). III. K2Sn203, Rb2Sn203, and Cs2Sn2O3 - a ComparisonHitherto unknown Rb2Sn2O3 has been obtained by heating of mixtures of binary oxides [RbO0.48 + SnO, Rb:Sn = 1.1:1, Al2O3-cylinders, Ar] as deep yellow powder or deep yellow single crystals. It is isotypic to K2Sn2O3, R3m-D3d5 with a = 6.086 Å, c = 15.101 Å, Z = 3, dcalc = 4.69, dobs = 4.64 g X cm-3. For 260 hkl it is R = 5.27% and Rw = 5.09% (MoKα, 4-circle diffractometer data). The structure of K2Sn2O3 and Rb2Sn2O3 is compared with that of Cs2Sn2O3. For both types Effektive Coordination Numbers, ECoN, and the Madelung Part of Lattice Energy, MAPLE, have been calculated.
    Notes: Neu dargestellt wurde Rb2Sn2O3 durch Tempern entsprechender Gemenge binärer Oxide [RbO0,48 + SnO, Rb:Sn = 1,1:1; Al2O3-Bömbchen, Ar] als tiefgelbes Pulver bzw. tiefgelbe Einkristalle. Es ist isotyp mit K2Sn2O3, R3m-D3d5 mit a = 6,086 Å, c = 15,101 Å, Z = 3, drö = 4,69 und dpyk = 4,64 g · cm-3. Für 260 hkl ist R = 5,27% und Rw = 5,09% (MoKα, Vierkreisdiffraktometerdaten). Die Struktur von K2Sn2O3 und Rb2Sn2O3 wird mit der von Cs2Sn2O3 verglichen. Für beide Strukturtypen werden Effektive Koordinationszahlen, ECoN, und der Madelunganteil der Gitterenergie, MAPLE, berechnet und diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 485 (1982), S. 92-100 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxoargentates(I) of Alkali Metals. On Na3AgO2Na3AgO2 has been prepared anew (light pale-yellow powder samples; clear transparent single crystals). It crystallizes orthorhombic (space group Ibam) with a = 5.463, b = 10.926, c = 5.926 Å, Z = 4, drö = 3.94 g X cm-3, dpyk = 3.89 g X cm-3; parameters are given in the text. The structure of Na3AgO2, marked by linear “dumb-bells” [O—Ag—O], d(Ag→O) = 2.09 Å is a novel variant of Na2O. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, have been calculated and are discussed.
    Notes: Erneut dargestelltes Na3AgO2 (hell blaß-gelbes Pulver, glasklare Einkristalle), orthorhombisch, Raumgruppe Ibam mit a = 5,463 Å, b = 10,926 Å, c = 5,926 Å, Z = 4, drö = 3,94 g · cm-3, dpyk = 3,89 g · cm-3, Lageparameter siehe Text, ist strukturell durch lineare „Hanteln“ [O—Ag=O], d(Ag→O) = 2,095 Å ausgezeichnet. Es liegt eine neuartige Na2O-Variante vor.Der Madelung-Anteil der Gitterenergie, MAPLE, und Effektive Koordinationszahlen, ECoN, werden berechnet und diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 492 (1982), S. 76-82 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Fluorides of Copper. On Cs[CuF4]Due to powder diagrams, Cs[CuF4], the first diamagnetic fluoride (χMol = -516·10-6 cm3/Mol) of trivalent copper, with planar coordination orange-coloured, crystallizes tetragonal, K[BrF4]-type of structure with planar [CuF4]-units (a = 5.8488(4) Å, c = 12.043(1) Å). We obtained Cs[CuF4] by high pressure fluorination (pF2 = 350 bar, 400°C, 7 h) of CsCuCl3 in autoclaves.
    Notes: Als erstes diamagnetisches Fluorid des dreiwertigen Kupfers, mit planarer Koordination, wurde neu Cs[CuF4], ein orangefarbenes Pulver, tetragonaler K[BrF4]-Typ (a = 5,8488(4) Å, c = 12,043(1) Å, χMol = -516 · 10-6 cm3/Mol) durch Drucksynthese (pF2 = 350 bar, 400°C, 7 h) aus CsCuCl3 im Autoklaven dargestellt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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