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  • Springer  (47)
  • 2000-2004  (47)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Second Eigenvalue of Schrödinger Operators¶and Mean Curvature (2000)
    Springer
    Communications in mathematical physics 208 (2000), S. 761-770 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: Let $M$ be a compact immersed submanifold of the Euclidean space, the hyperbolic space or the standard sphere. For any continuous potential q on M, we give a sharp upper bound for the second eigenvalue of the operator −Δ+q in terms of the total mean curvature of M and the mean value of q. Moreover, we analyze the case where this bound is achieved. As a consequence of this result we obtain an alternative proof for the Alikakos–Fusco conjecture concerning the stability of the interface in the Allen–Cahn reaction diffusion model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002200050009
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  • 2
    Electronic Resource
    Electronic Resource
    Mixed Ligand Complexes of 5-arylazo-8-hydroxyquinoline and α-amino Acids with Co(II), Ni(II) and Cu(II) (2000)
    Springer
    Journal of thermal analysis and calorimetry 62 (2000), S. 665-679 
    Details
    ISSN: 1572-8943
    Keywords: α-amino acids ; 5-arylazo-8-hydroxyquinoline ; characterization ; mixed ligand complexes ; thermal analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ten mixed ligand complexes of the type [M(X-QA)(aa)] and [Ni(X-QA)2(Haa)(H2O)],where X-HQA=5-arylazo-8-hydroxyquinoline derivatives, M=Co(II) orCu(II) and Haa=glycine (gly), alanine (ala) or methionine (met), have been prepared. The complexes have been characterized by elemental analysis, IR and electron spectra and thermal analysis. A tetrahedral structure has been proposed for the cobalt(II) and copper(II) complexes with bidentate coordination of amino acids. The nickel(II) complexes have been assigned an octahedral structure with the amino acids acting as monodentate ligands. The thermal behaviour of the complexes has been studied before and after γ-irradiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026761007006
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of Doping of NaNO3 on the Solid Phase Thermal Decomposition of Bitumen and Cement (2000)
    Springer
    Journal of thermal analysis and calorimetry 63 (2000), S. 525-532 
    Details
    ISSN: 1572-8943
    Keywords: bitumen ; portland cement ; safety considerations ; solidification ; thermal stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The thermal stability of solidified NaNO3 salts in bitumen and cement has been investigated for safety considerations in the field of solidification of radioactive waste. The thermal decomposition of bitumen and cement in presence of NaNO3 in a temperature range 22–650°C has been studied. The fraction decomposed of the pure samples and mixtures showed slow linear reactions followed by acceleratory and decay stages. Data are analyzed according to both Freeman-Carroll and Coats-Redfern kinetics to evaluate the activation energy and the order of reactions of all mixtures. It is found that the activation energies of bitumen and cement were 594 and 203 kJ mol-1, respectively. The order of reactions of bitumen and cement was 2 and 4, respectively. The addition of NaNO3 shortens the duration of the induction period in all mixtures. It was concluded that solidification of radioactive waste containing NaNO3 in bitumen and cement should be applied in the temperature range 22–300°C. At temperature higher than300°C solidification should be in cement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010193921031
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  • 4
    Electronic Resource
    Electronic Resource
    Radical polymerization and copolymerization behavior of 1-cyanoethanoyl-4-acryloylthiosemicarbzide (2000)
    Springer
    Journal of polymer research 7 (2000), S. 229-235 
    Details
    ISSN: 1572-8935
    Keywords: Functional monomers ; Polymerization ; Copolymerization ; Kinetic studies ; Reactivity ratios
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract 1-Cyanoethanoyl-4-acryloylthiosemicarbazide (CEATS) was synthesized for the first time as a new chelating monomer. Its structure was confirmed by both elemental and spectral analyses. Radical polymerization and copolymerization of CEATS was been carried out in dimethylformamide (DMF) in the presence of azobisisobutyronitrile (AIBN) as an initiator. Kinetic studies for the polymerization behavior of CEATS were performed. The complex formation of the CEATS monomer and polymer (PCEATS) with Cu II cation was investigated and its stability constant determined. The rate of copolymerization of CEATS with some conventional monomers, namely vinyl acetate, methyl methacrylate and acrylonitrile, was measured as a function of the mole fraction of the monomers. The reactivity ratios (r1, r2) for the various copolymer systems investigated together with the Q and e values of the CEATS monomer were determined. Moreover, the thermal gravimetric analysis of the prepared polymers and their copolymers with acrylonitrile were also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0124-x
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  • 5
    Electronic Resource
    Electronic Resource
    Testing Address Decoder Faults in Two-Port Memories: Fault Models, Tests, Consequences of Port Restrictions, and Test Strategy (2000)
    Springer
    Journal of electronic testing 16 (2000), S. 487-498 
    Details
    ISSN: 1573-0727
    Keywords: multi-port memories ; single-port memories ; fault models ; address decoder faults ; march tests ; fault coverage ; read-only ports ; write-only ports
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A two-port memory contains two duplicated sets of address decoders, which operate independently. Testing such memories requires the use of single-port tests as well as special two-port tests; the test strategy determines which tests have to be used. Many two-port memories have ports which are read-only or write-only; this impacts the possible tests for single-port and two-port memories, as well as the test strategy. In this paper the effects of interference and shorts between the address decoders of the two ports on the fault modeling are investigated. Fault models and their tests are introduced. In addition, the consequences of the port restrictions (read-only or write-only ports) on the fault models and tests are discussed, together with the test strategy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008320716847
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  • 6
    Electronic Resource
    Electronic Resource
    Crystallization Sequence of Brines–Geometrical Principles for a Computer Assisted Calculation (2000)
    Springer
    Monatshefte für Chemie 131 (2000), S. 25-37 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Sea water; Brine; Crystallization sequence; Simulation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Die Kristallisationsabfolge beim Abdampfen von Salzsolen wurde bei 25°C aufder Basis der entsprechenden Phasendiagramme computerunterstützt berechnet. Dabei wurden sowohl die auskristallisierenden festen Phasen bestimmt als auch deren Massenbilanzen ermittelt. Um quantitative Information über das Abdampfverhalten von Salzsolen zu erhalten, wurden diesen Berechnungen zwei Grenzannahmen zugrunde gelegt: i) das Fest-flüssig-Gleichgewicht stellt sich laufend ein, sodaß sich feste Phasen während des Verdampfungsprozesses teilweise oder vollständig wieder auflösen können, bzw. ii) die festen Phasen sedimentieren und trennen sich von der flüssigen Phase, sodaß keine Wiederauflösung möglich ist. Tages- bzw. jahreszeitliche Temperaturschwankungen sowie metastabile Gleichgewichte wurden nicht berücksichtigt.
    Notes: Summary.  A computer assisted calculation of the crystallization sequence of a brine is performed on the basis of the respective phase diagrams at 25°C. The nature of the solids and the mass balance are determined. The calculation gives immediate quantitative information of the brine behavior during evaporation. The calculation is performed assuming that i) the solids are always in equilibrium with the liquid, i.e. that some solid phases can be partially or completely redissolved during evaporation, or ii) the solids are separated from liquid by sedimentation and no redissolution is possible. The seasonal or day-night fluctuations of temperature and metastable equilibria have not been taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010297
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  • 7
    Electronic Resource
    Electronic Resource
    Potentiometric Studies on SomeCephalosporin Complexes (2000)
    Springer
    Monatshefte für Chemie 131 (2000), S. 1031-1038 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Potentiometry; Glycine; Cephalosporins; Complexes.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary.  The interaction of Ca(II), Cu(II), Zn(II), Pb(II), and La(III) ions with the antibiotics cephalexin, cefadroxil, cephaloridine, and cefoperazone as secondary ligands was investigated potentiometrically. The formation constants were determined for a ligand-to-metal ratio of 1:1 at 25°C and KNO3. The protonation constants of the complexes were evaluated for the system . The order of stability of the binary and ternary complexes were examined. It was found that glycine adds preferably [M(II)-cephalosporin] rather than to the aqueous complexes of M(II). In all cases 1:1:1 complexes were formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007060070034
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  • 8
    Electronic Resource
    Electronic Resource
    First-principles electronic structure of rare-earth arsenides (2001)
    Springer
    The European physical journal 23 (2001), S. 191-199 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.20.-b Electron density of states and band structure of crystalline solids – 71.20.Eh Rare earth metals and alloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The electronic properties of rare-earth arsenides have been calculated from first principles. In the calculations we have treated the rare-earth f electrons both as core-like and as valence-like electrons. We consider the changes in the energy bands and in the density of states near the Fermi level which are found to be relevant, except for the case of LuAs, and discuss this in relation with the role played from the rare-earth 5d derived states. Moreover we show that the rare-earth 5d related bands are particularly sensitive to the variation of the lattice constant; change in the lattice constant of less than 1% leads to a different behaviour with respect to the crossing of the rare-earth 5d derived bands and the As 4p derived bands along the Δ-direction. This point is discussed in connection with the possibility of having a semimetal-semiconductor transition in the rare-earth arsenides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170068
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  • 9
    Electronic Resource
    Electronic Resource
    Heterogeneity of RMA-S cell line: derivatives of RMA-S cells lacking H2-Kb and H2-Db expression (2000)
    Springer
    Immunogenetics 52 (2000), S. 150-154 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002510000254
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  • 10
    Electronic Resource
    Electronic Resource
    Transport and Reaction at Endothelial Plasmalemma: Distinguishing Intra- From Extracellular Events (2000)
    Springer
    Annals of biomedical engineering 28 (2000), S. 1010-1018 
    Details
    ISSN: 1573-9686
    Keywords: Oxidation reduction ; Methylene blue ; Toluidine blue O ; Ubiquinone ; Mathematical modeling ; Multiple indicator dilution ; Lung cell culture ; Physiome ; Hyperoxia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract The pulmonary endothelium is a chemical reactor that modifies blood composition in several ways, including reduction of the oxidized forms of certain redox active substances in the blood. The physiological functions of the transplasma membrane electron transport systems involved in the latter are not fully understood, but an argument is made that they are involved in antioxidant defense. In addition, the experimental approaches used to characterize the process, including studies at whole organ, cell culture, and subcellular levels, along with the use of mathematical modeling, may be representative of the physiome concept wherein a goal is the integration of information obtained at all levels of biological organization. In this article, separation of intra- and extracellular events involved in the disposition of redox active probes within the lungs is the particular example. © 2000 Biomedical Engineering Society. PAC00: 8716Uv, 8716Dg, 8715Rn, 8719Uv
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1114/1.1308490
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