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  • Springer  (229)
  • Oxford University Press  (16)
  • 1995-1999  (245)
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  • 1
    Electronic Resource
    Electronic Resource
    Individual study of chromium in the stainless steel implants degradation: An experimental study in mice (1999)
    Springer
    BioMetals 12 (1999), S. 277-282 
    Details
    ISSN: 1572-8773
    Keywords: biomaterial ; chromium ; histology ; mice organs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract To study the accumulation and the histological effects in mice organs caused by hexavalent chromium, one of the corrosion products released from AISI 316L stainless steel implants, mice groups were subcutaneously injected with a metallic solution of chromium during a certain period of time. Similar injections were made with HBSS (Hank's Balanced Salt Solution) in other groups to be used as controls. The levels of chromium found in the liver, kidney and spleen of the control and the treated animals were obtained by atomic absorption spectrometry (AAS) and were compared to those obtained by AdSV (adsorptive stripping voltammetry) to test the accuracy of the results. During the experimental period, the liver and spleen showed a progressive and significant accumulation of chromium whereas in the kidney the significant accumulation found after the first week practically remained unchanged during the four weeks. Apparently, the histological analysis of these tissues did not evidence any relevant morphological alteration induced by the chromium accumulations during the four weeks of treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009249700719
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  • 2
    Electronic Resource
    Electronic Resource
    Purification of Neurospora crassa alkaline phosphatase without DNAse activity for use in molecular biology (1995)
    Springer
    World journal of microbiology and biotechnology 11 (1995), S. 505-507 
    Details
    ISSN: 1573-0972
    Keywords: Alkaline phosphatase ; fungi ; molecular biology ; Neurospora crassa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Alkaline phosphatase, excreted by Neurospora crassa preg c and purified to apparent homogeneity by 7.5% PAGE, did not show DNAase activity and removed the terminal 5′-phosphate group from plasmid Bluescript M13+ linearized with EcoRI. The preg c strain may therefore replace other sources of alkaline phosphatase for use in dephosphorylating linearized plasmidial DNA in cloning experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286362
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  • 3
    Electronic Resource
    Electronic Resource
    Dual sorption of metal-ions on a crosslinked resin of 2-acrylamidoglycolic acid and 4-vinylpyridine (1996)
    Springer
    Polymer bulletin 37 (1996), S. 191-198 
    Details
    ISSN: 1436-2449
    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: Summary A resin containing 4-vinylpyridine and 2-acrylamidoglycolic acid was synthesized by radical polymerization with subsequent crosslinking by N,N′-methylene-bis-acrylamide. The resin was characterized by elemental analyses and FT-IR spectroscopy. The ability of this resin as well as both crosslinked homopolymers to bind Cu(II), Fe(II), Fe(III) and U(VI) was studied at different pHs depending on the metal ion. From pH=2 U(VI) was sorbed above 96% from an aqueous solution of 1.0 g/L. A dual sorption mechanism to U(VI) depending on the pH is suggested. The elution of the metal ions from the loaded resins was assayed with H2SO4 and Na2CO3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294121
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  • 4
    Electronic Resource
    Electronic Resource
    Highly Pb(II)-selective resin based on crosslinked poly(acrylamido glycolic acid) copolymer (1998)
    Springer
    Polymer bulletin 40 (1998), S. 721-728 
    Details
    ISSN: 1436-2449
    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: SUMMARY The crosslinked poly(acrylamido glycolic acid) (180-250 µm) was used in the adsorption/desorption studies. Adsorption rate, capacity of the resin for the selected metal ions, i.e. Cd(III), Zn(II), Hg(II), Pb(II), and Cr(III) were investigated in aqueous media. At different pH values (1.0–5.0) very high adsorption was observed for Pb(II) at pH 3 and 5. The adsorption equilibrium was rapidly achieved in about 5–10 min. However, when the Pb(II) ions competed with Cd(II) (in the case of the adsorption from their binary mixture) the amount of adsorption for Pb(II) decreased. Desorption of Pb(II) was studied by using 1-4M HNO3 and 1-4M HClO4. High desorption ratios (more than 90%) were achieved in all cases. Adsorption/desorption cycles showed the possibility of repeated use of this resin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050314
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  • 5
    Electronic Resource
    Electronic Resource
    Comparative study on the lamellar crystal structure of high and low density polyethylenes (1997)
    Springer
    Polymer bulletin 38 (1997), S. 707-714 
    Details
    ISSN: 1436-2449
    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. A comparative study was undertaken on well characterized HDPE and LDPE samples in order to obtain a better understanding of the morphology of the crystalline phase. Thickness of the lamellae was determined by WAXS. The melting points were calculated by empirical and Gibbs-Thomson equations, considering either folded or extended chains, and compared to DSC data. The results confirm that in HDPE the chains are folded, the segment between folds containing about 100 carbon atoms, while in LDPE, the chains are extended, with segments of about 73 carbon atoms in the crystalline core, linked to the paracrystalline layer and amorphous zones, which contain long folds and chain ends, as proposed in the 3-phase model by Vile et al.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050109
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of the structure and composition on surface tension of aqueous solution of graft copolymers of polyacrylamide backbone and polyalkyleneoxide branches (1997)
    Springer
    Polymer bulletin 39 (1997), S. 73-78 
    Details
    ISSN: 1436-2449
    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. Polyacrylamide homopolymers and graft copolymers of poly(acrylamide-g-ethylene oxide) and poly(acrylamide-g-propylene oxide) were synthesized, characterized by SEC, FTIR and 13C-NMR and the behavior of their aqueous solutions was evaluated by surface tension measurements. By using the macromonomer technique, it is more difficult to incorporate poly(propylene oxide) branches than poly(ethylene oxide) branches. Graft copolymers of polyacrylamide and poly(propylene oxide) showed higher reduction of surface tension than poly(acrylamide-g-ethylene oxide) since they present a structure made up of hydrophilic and hydrophobic segments. Poly(acrylamide-g-propylene oxide) exhibits surfactant behavior, and the surface tension of its aqueous solution depends on the poly(propylene oxide) graft chain length and amount.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050122
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  • 7
    Electronic Resource
    Electronic Resource
    Electrostatic surface shape resonances of a finite number of ridges (1998)
    Springer
    The European physical journal 3 (1998), S. 119-123 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 73.20.Mf Collective excitations (including plasmons and other charge-density excitations) - 78.66.Bz Metals and metallic alloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The resonance properties of localized electrostatic surface modes associated with a finite number of ridges on an otherwise planar surface are investigated. Numerical solutions of the homogeneous integral equations that describe the electromagnetic fields in the vicinity of the ridges are used to obtain the dispersion relation of surface plasmons. The frequencies of the electrostatic surface shape resonances are calculated for ridges with Gaussian, Lorentzian, sinusoidal, exponential, and triangular profiles. We show the existence of splittings of the plasmon frequencies, which depends on the surface profile function and on the distance between the ridges. Considering the ridge with a sinusoidal profile, we obtain the limit on the number of ridges which generates a frequency splitting of the electrostatic surface shape resonances, whose frequency values converge to those of the dispersion relation of surface plasmons on one-dimensional sinusoidal grating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050290
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  • 8
    Electronic Resource
    Electronic Resource
    On the receding horizon hierarchical optimal control of manufacturing systems (1997)
    Springer
    Journal of intelligent manufacturing 8 (1997), S. 425-433 
    Details
    ISSN: 1572-8145
    Keywords: Hierarchical optimal control ; manufacturing systems ; receding horizon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper concerns the development of a hierarchical framework for the integrated planning and scheduling of a class of manufacturing systems. In this framework, dynamic optimization plays an important role in order to define control strategies that, by taking into account the dynamic nature of these systems, minimize customized cost functionals subject to state and control constraints. The proposed architecture is composed of a set of hierarchical levels where a two-way information flow, assuming the form of a state feedback control, is obtained through a receding horizon control scheme. The averaging effect of the receding horizon control scheme enables this deterministic approach to handle random and unexpected events at all levels of the hierarchy. At a given level, production targets to the subsystems immediately below are defined by solving appropriate optimal control problems. Efficient iterative algorithms based on optimality conditions are used to yield control strategies in the form of production rates for the various subsystems. At the lower level, this control strategy is further refined in such a way that all sequences of operations are fully specified. The minimum cost sensitivity information provided in the optimal control formulation supports a mechanism, based on the notion of a critical machine, which plays an important role in the exploitation of the available flexibility. Finally, an important point to note is that our approach is particularly suited to further integration of the production system into a larger supply chain management framework, which is well supported by recent developments in hybrid systems theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018562316987
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  • 9
    Electronic Resource
    Electronic Resource
    Voltammetric study of the Fe-S-Ebonex® system (1995)
    Springer
    Journal of applied electrochemistry 25 (1995), S. 1045-1051 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A voltammetric study of the Fe-S-Ebonex® system at pH 3 is reported. Aqueous solutions of Na2S2O3 and (NH4)2Fe(SO4)2 were used as sources of sulphur and iron, respectively. The influence of the starting potential on the electrochemical behaviour of the system is analysed. Deposits obtained at −1.1 V vs SCE, by potentiostatic methods, show X-ray diffraction peaks of the pyrite structure. Troilite and mackinawite phases are also identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00241954
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  • 10
    Electronic Resource
    Electronic Resource
    The role of bulk H and C species in the chain lengthening of Fischer-Tropsch synthesis over nickel (1997)
    Springer
    Catalysis letters 45 (1997), S. 221-226 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This work documents the possible role of bulk species (dissolved H and C atoms) in the Fischer-Tropsch reaction. This has led us to study the sorption (adsorption or absorption) of hydrogen when increasing the pressure from 0.1 to 5 MPa, the selectivity toward C2+ hydrocarbons in carbon monoxide hydrogenation at 5 MPa total pressure, and the amount of nickel carbide formed in the course of the reaction over unsupported nickel, Ni/SiO2, Ni/TiO2 and Ni/Cr2O3 catalysts. Increasing the hydrogen pressure results in a subsequent sorption which is found to be proportional to the nickel dispersion, and can be attributed either to a completion of the surface hydrogen adlayer (8%) or to a formation of a hydrogen sublayer. No relationship could be found between the selectivity towards C2+ hydrocarbons and the quantity of sorbed hydrogen. A correlation between this selectivity and the amount of nickel carbide formation was demonstrated, suggesting that the active phase which leads to C2+ hydrocarbons is nickel carbide, or that carbon atoms of subsurface sites participate in the homologation reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019071713602
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