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  • Springer  (120)
Publikationsart
Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
  • 1
    Digitale Medien
    Digitale Medien
    Adaptive finite element procedures in elasticity and plasticity (1996)
    Springer
    Engineering with computers 12 (1996), S. 120-141 
    Details
    ISSN: 1435-5663
    Schlagwort(e): Discontinuous Galerkin ; Error estimation adaptivity ; Postprocessing ; Superconvergence
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik , Maschinenbau , Technik allgemein
    Notizen: Abstract The paper discusses error estimation and h-adaptive finite element procedures for elasticity and plasticity problems. For the spatial discretization error, an enhanced Superconvergent Patch Recovery (SPR) technique which improves the error estimation by including fulfillment of equilibrium and boundary conditions in the smoothing procedure is discussed. It is known that an accurate error estimation on an early stage of analysis results in a more rapid and optimal adaptive process. It is shown that node patches and element patches give similar quality of the postprocessed solution. For dynamic problems, a postprocessed type of error estimate and an adaptive procedure for the semidiscrete finite element method are discussed. It is shown that the procedure is able to update the spatial mesh and the time step size so that both spatial and time discretization errors are controlled within specified tolerances. A time-discontinuous Galerkin method for solving the second-order ordinary differential equations in structural dynamics is also presented. Many advantages of the new approach such as high order accuracy, possibility to filter effects of spurious modes and convenience to apply adaptive analysis are observed. For plasticity problems, some recent work that improved plastic strains and plastic localization is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01299397
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    A class of constraint qualifications in nonsmooth optimization (1999)
    Springer
    Annals of operations research 87 (1999), S. 383-391 
    Details
    ISSN: 1572-9338
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Wirtschaftswissenschaften
    Notizen: Abstract In this paper, we give a generalized Abadie constraint qualification (CQ) for a class of nonsmooth vector‐valued optimization. Under this CQ, we obtained the Kuhn‐Tucker‐typeoptimality condition where the multipliers associated with the objective functions are all positive.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1018953607589
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  • 3
    Digitale Medien
    Digitale Medien
    Testing for Unit Roots in a Nearly Nonstationary Spatial Autoregressive Process (2000)
    Springer
    Annals of the Institute of Statistical Mathematics 52 (2000), S. 71-83 
    Details
    ISSN: 1572-9052
    Schlagwort(e): First-order autoregressive process ; unit roots ; nearly non-stationary ; periodogram ordinate ; local Pitman-type alternatives ; Ornstein-Uhlenbeck process
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract The limiting distribution of the normalized periodogram ordinate is used to test for unit roots in the first-order autoregressive model Ζst=α Ζs-1,t+βΖs,t-1-αβ Ζs-1,t-1+ɛst. Moreover, for the sequence α n = e c/n , β n = e d/n of local Pitman-type alternatives, the limiting distribution of the normalized periodogram ordinate is shown to be a linear combination of two independent chi-square random variables whose coefficients depend on c and d. This result is used to tabulate the asymptotic power of a test for various values of c and d. A comparison is made between the periodogram test and a spatial domain test.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004184932031
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  • 4
    Digitale Medien
    Digitale Medien
    Oxidation catalysis with well-characterised vanadyl bis-bipyridine complexes encapsulated in NaY zeolite (1996)
    Springer
    Topics in catalysis 3 (1996), S. 437-449 
    Details
    ISSN: 1572-9028
    Schlagwort(e): oxidation catalysis ; zeolite ; vanadium complex ; XPS-CA ; EPR-DRS ; IR-Raman
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Vanadyl exchanged faujasite (VO2+-NaY) allows bipyridine complexation, giving a heterogeneous“ship-in-a-bottle” catalyst denoted as [VO(bpy)2]2+-NaY. The [VO(bpy)2]2+ complexes associated with the zeolite are characterised with FT-Raman, FT-IR, XPS, and diffuse reflectance spectroscopy (DRS), as well as with electron paramagnetic resonance (EPR). It is established that the cationic complexes are intrazeolitic and homogeneously distributed across the zeolite crystals and both the zeolite and the neutral bipyridine ligands stabilise VIV. The catalytic oxidation of cyclohexane and cyclohexene with different peroxides or mono-oxygen atom donors in presence of several solvents is described. Good epoxide selectivity results from the complexation by bipyridine thus favoring the heterolytic over the homolytic decomposition pathway of V-peroxo-intermediates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02113866
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  • 5
    Digitale Medien
    Digitale Medien
    Paraquat induced activation of transcription factor AP-1 and apoptosis in PC12 cells (1999)
    Springer
    Journal of neural transmission 106 (1999), S. 1-21 
    Details
    ISSN: 1435-1463
    Schlagwort(e): Keywords: Paraquat ; Parkinson's disease ; transcription factor ; AP-1 ; apoptosis ; cycloheximide ; genistein ; SOD ; catalase ; oxidative stress.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary. Drugs and certain environmental toxins may be responsible for the pathogenesis of Parkinson's disease. We have used paraquat as a model toxin for this study since paraquat has been shown to make its way to the nerve terminals and cause cell death of dopamine neurons by oxidative injury. We have shown by the electrophoretic mobility shift assay that paraquat, together with low concentrations of chelated iron (Fe++/DETAPAC), induced the activation of transcription factor AP-1 binding activity to DNA. Under similar conditions we also found by both a DNA laddering assay procedure and by terminal deoxynucleotidyl transferase assay (TUNEL assay) that paraquat also induces apoptotic cell death. Interestingly, both apoptotic cell death and AP-1/DNA binding activity induced by paraquat were blocked by cyclohexamide and genistein, indicating that both the AP-1/DNA binding activation and apoptosis induced by paraquat are closely related. Moreover, cells were also protected from paraquat toxicity in the presence of antioxidant defense enzymes SOD and catalase. The results support the hypothesis that oxidative stress may be contributing to the apoptotic cell death of dopaminergic neurons, leading to the manifestation of Parkinson's disease. Since paraquat was an important herbicide in the mid 20th Century, our results have the important implication that exposure to environmental toxins such as paraquat may induce Parkinson's disease.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s007020050137
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  • 6
    Digitale Medien
    Digitale Medien
    Transport properties of La 1 - x Ca x MnO 3 ( 0.5 ? x 〈 1) (2002)
    Springer
    The European physical journal 26 (2002), S. 467-471 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 72.20.Ht High-field and nonlinear effects – 72.60.+g Mixed conductivity and conductivity transitions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The transport properties of the La1-xCaxMnO3 ( 0.5 ? x 〈 1) system in magnetic fields up to 14 T were studied. We found that the relationship between the charge ordering temperature T CO and Mn4+ content n Mn4 + obeys the formula T CO / T max = 1 - a ( n Mn4 + - n 0 ) 2 , here n0 and a are constants and T max is the maximum of T CO . For x = 0.65, T CO arrives at the maximum value of 249.5 K in zero magnetic field, while the charge ordered (CO) state is most stable around x = 0.75. For x = 0.5 when H 〈 6 T the resistivity displays Mott's variable-range hopping (VRH) behavior, when 6 〈 H 〈 12 T it is suggested that two kinds of conduction mechanism, i.e., VRH and magnetic polarons, coexist in the material, and when H 〉 12 T the resistivity shows metallic-like behavior and the transport mechanism is attributed to coexistence of magnetic polarons and free carriers. For x = 0.95, the conduction mechanism accords with the coexistence of VRH and magnetic polarons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e20020115
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  • 7
    Digitale Medien
    Digitale Medien
    Experimental study on photocount statistics of the ultraweak photon emission from some living organisms (1993)
    Springer
    Cellular and molecular life sciences 49 (1993), S. 291-295 
    Details
    ISSN: 1420-9071
    Schlagwort(e): Ultraweak photon emission ; photocount statistics ; coherence ; biophoton ; low-level biological chemiluminescence
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract The hypothesis that biophotons display a high degree of coherence was tested by measuring photocount statistics (PCS) of the ultraweak photon emission from three living organisms (cucumber seedling, mungbean seedling and soybean rhizobium bacteroids) with a high-sensitivity single-photon counter. For comparison, the same experiments were performed for laser beam, randomized laser beam, chemiluminescence from autoxidation of luminol and the dark counts of the equipment. Photocount distributions, close to Poissonian, were observed for the three tested biological systems but not for the pure chemiluminescence of luminol.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01923404
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  • 8
    Digitale Medien
    Digitale Medien
    Bounded and L2 harmonic forms on universal covers (1998)
    Springer
    Geometric and functional analysis 8 (1998), S. 283-303 
    Details
    ISSN: 1420-8970
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract. ((Without abstract))
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s000390050057
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  • 9
    Digitale Medien
    Digitale Medien
    Dissociation of CO on stepped/kinked surface areas of a rounded Pt crystal: I. Clean surface (1989)
    Springer
    Catalysis letters 2 (1989), S. 113-120 
    Details
    ISSN: 1572-879X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Work function measurements carried out by FEM on rounded, “FEM-clean” Pt crystals show that the dissociation of adsorbed CO occurs predominantly on kinked edges. The dissociation activity of a crystal area is proportional to its kink density.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00774593
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  • 10
    Digitale Medien
    Digitale Medien
    Heat-pipe oven for large column densities with a well-defined optical path length (1996)
    Springer
    Applied physics 62 (1996), S. 87-90 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65.Ky ; 42.79.Nv
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A concentric heat-pipe oven of improved design is presented which provides a metal-vapor inert-gas mixture of large column density and simultaneously with a stable, well-defined optical path length. It is applied to the efficient sum-frequency mixing in a metal-vapor inert-gas mixture containing magnesium and krypton. The corresponding phase-matching curves, the intensity profiles around the two-photon resonance and the conversion efficiencies are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081253
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