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  • 1
    Electronic Resource
    Electronic Resource
    NONLINEAR MODELING AND PREDICTION OF A RIVER FLOW SYSTEM (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 34 (1998), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Model estimation and prediction of a river flow system are investigated using nonlinear system identification techniques. We demonstrate how the dynamics of the system, rainfall, and river flow can be modeled using NARMAX (Nonlinear Autoregressive Moving Average with eXogenuous input) models. The parameters of the model are estimated using an orthogonal least squares algorithm with intelligent structure detection. The identification of the nonlinear model is described to represent the relationship between local rainfall and river flow at Enoree station (inputs) and river flow at Whitmire (output) for a river flow system in South Carolina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1998.tb05435.x
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  • 2
    Electronic Resource
    Electronic Resource
    Electrical Properties of SiGe Epitaxial Layers for Photovoltaic Application as Studied by Scanning Electron Microscopical Methods (1998)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 63-64 (Dec. 1998), p. 509-518 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/26/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.63-64.509.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Speciation of vanadium (IV) and vanadium (V) with Eriochrome Cyanine R in natural waters by solid phase spectrophotometry (1998)
    Springer
    Fresenius' journal of analytical chemistry 360 (1998), S. 31-37 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The separation and preconcentration of vanadium (IV) and vanadium (V) using Sephadex DEAE A-25 with Eriochrome Cyanine R has been studied, based on the preconcentration of vanadium (IV) in the first step and V(V) after reduction with ascorbic acid in the second step. Factors affecting the optimum fixation of the complex were investigated. The absorbance of the solid phase is measured directly at 563 nm for V(IV), at 585 nm for V(V) and at 750 nm for both. The proposed method provides a simple and specific procedure for the separation of vanadium in natural waters. The calibration graph is linear up to 150 ng/mL, with RSD of 4.7% for V(IV) and 4.0% for V(V). The detection limits are 1.6 and 1.4 ng/mL for V(IV) and V(V), respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050637
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  • 4
    Electronic Resource
    Electronic Resource
    Differential induction of enzymes involved in anaerobic metabolism of aromatic compounds in the denitrifying bacterium Thauera aromatica (1998)
    Springer
    Archives of microbiology 170 (1998), S. 120-131 
    Details
    ISSN: 1432-072X
    Keywords: Key words Anaerobic aromatic metabolism ; Benzoyl-CoA reductase ; Phenylphosphate carboxylase ; 4-Hydroxybenzoyl-CoA reductase ; 2-Aminobenzoate ; Phenylalanine ; Phenylacetyl-CoA ; Phenylglyoxylate ; Toluene ; CoA ligase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Differential induction of enzymes involved in anaerobic metabolism of aromatic substrates was studied in the denitrifying bacterium Thauera aromatica. This metabolism is divided into (1) peripheral reactions transforming the aromatic growth substrates to the common intermediate benzoyl-CoA, (2) the central benzoyl-CoA pathway comprising ring-reduction of benzoyl-CoA and subsequent β-oxidation to 3-hydroxypimelyl-CoA, and (3) the pathway of β-oxidation of 3-hydroxypimelyl-CoA to three acetyl-CoA and CO2. Regulation was studied by three methods. 1. Determination of protein patterns of cells grown on different substrates. This revealed several strongly substrate-induced polypeptides that were missing in cells grown on benzoate or other intermediates of the respective metabolic pathways. 2. Measurement of activities of known enzymes involved in this metabolism in cells grown on different substrates. The enzyme pattern found is consistent with the regulatory pattern deduced from simultaneous adaptation of cells to utilisation of other aromatic substrates. 3. Immunological detection of catabolic enzymes in cells grown on different substrates. Benzoate-CoA ligase and 4-hydroxybenzoate-CoA ligase were detected only in cells yielding the respective enzyme activity. However, presence of the subunits of benzoyl-CoA reductase and 4-hydroxybenzoyl-CoA reductase was also recorded in some cell batches lacking enzyme activity. This possibly indicates an additional level of regulation on protein level for these two reductases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050623
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  • 5
    Electronic Resource
    Electronic Resource
    A Tabu Search Approach for the Resource Constrained Project Scheduling Problem (1998)
    Springer
    Journal of heuristics 4 (1998), S. 123-139 
    Details
    ISSN: 1572-9397
    Keywords: project management ; limited resources ; tabu search
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract An appropriate tabu search implementation is designed to solve the resource constrained project scheduling problem. This approach uses well defined move strategies and a structured neighbourhood, defines appropriate tabu status and tenure and takes account of objective function approximation to speed up the search process. A sound understanding of the problem has helped in many ways in designing and enhancing the tabu search methodology. The method uses diversification, intensification and handles infeasibility via strategic oscillation. The above methodology is tested on existing problems from the literature and also on parametrically generated problems with encouraging results. For comparison of results, optimal solutions are used in the former and lower bounds obtained by Lagrangian heuristics are used in the latter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009673512884
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  • 6
    Electronic Resource
    Electronic Resource
    Temporal Constraint Satisfaction Techniques in Job Shop Scheduling Problem Solving (1998)
    Springer
    Constraints 3 (1998), S. 203-211 
    Details
    ISSN: 1572-9354
    Keywords: temporal constraint satisfaction ; job shop scheduling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We describe a restriction of Dechter, Meiri and Pearl's TCSPs (Temporal Constraint Satisfaction Problems) sufficiently expressive to represent any job shop scheduling problem. A solver based on the restriction is then described, which is similar to Ladkin and Reinefeld's qualitative interval network solver; except, however, that the filtering method used during the search is not path consistency but either ULT (Upper-Lower Tightening) or LPC (Loose Path- Consistency), which are both less effective but have the advantage of getting rid of the so-called “fragmentation problem”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009777711218
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  • 7
    Electronic Resource
    Electronic Resource
    Mutation and conflicts between artificial and natural selection for quantitative traits (1998)
    Springer
    Genetica 102-103 (1998), S. 171-181 
    Details
    ISSN: 1573-6857
    Keywords: mutation ; quantitative genetics ; selection ; variation ; pleiotropy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract There is substantial new variation for quantitative traits generated by mutation that can be utilised by artificial selection. With long-term selection, however, response is often attenuated and a selection limit sometimes reached, even though genetic variation is frequently still present in these lines. In this paper, the theoretical bases of long-term response and variability of populations that come from mutational variance are reviewed, and the relation between them is related to the strength and mode of the natural selection, whether due to pleiotropic effects of mutant genes or stabilising selection. Simple formulae to predict the consequence of relaxed or reversed selection are derived. Results from long-term selection experiments in mice in this laboratory are described and related to the theoretical analyses with the aim of reconciling the evidence for substantial standing variation with the low rate of response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017081614251
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  • 8
    Electronic Resource
    Electronic Resource
    Three-Photon Absorption in InAs (1998)
    Springer
    Optical and quantum electronics 30 (1998), S. 193-200 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Using 125 ps laser pulses, we observe three-photon absorption in room temperature InAs at a wavelength of 9.54 µm. This effect is readily identified by temperature-tuning the semiconductor bandgap through the three-photon absorption edge. A three-photon absorption coefficient of K3 = 1 ± 0.6 × 10-3 cm3 MW-2 is extracted from non-linear absorption data obtained with an open-aperture Z-scan. Time-resolved measurement at high irradiance reveals an increase of absorption due to hot carriers. We also present an autocorrelation measurement of our CO2 laser pulse that shows two complete optical free-induction-decay cycles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006962228937
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  • 9
    Electronic Resource
    Electronic Resource
    Sodium Channel Fragments: Contributions to Voltage Sensitivity and Ion Selectivity (1998)
    Springer
    Bioscience reports 18 (1998), S. 279-286 
    Details
    ISSN: 1573-4935
    Keywords: Voltage sensors ; gating mechanisms ; selectivity filter ; secondary structure ; synthetic peptides ; planar lipid bilayers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The peptide strategy was employed to resolve structure-function relationships in the voltage-dependent sodium channel. Two families of motifs were studied: the four voltage sensors S4 extended with the short cytoplasmic linkers L45 and the four P-regions, between S5 and S6, each from the homologous domains of the electric eel sodium channel. Macroscopic conductance experiments conducted with synthetic S4L45s in neutral lipid planar bilayers pointed to a moderate voltage-sensitivity for repeat IV which has no proline, whereas S4L45 of repeats I and II (Pro 19) and especially of repeat III (Pro 14) were much more voltage-sensitive. The influence both of Pro and its position within the sequence was confirmed by comparing the human skeletal muscle channel isoform D4/S4 wild-type and the R4P analogue. Circular dichroism spectroscopy shows highest and lowest helicities for repeats IV and III. The conformational transition (from helix to extended, mainly beta forms), which occurs when the solvent dielectric constant increases, was broader with repeat III. These structural and functional correlates suggest alternative gating mechanisms. The different contributions of each repeat also have effects at the level of the main selectivity filter, which suggests self-recognition between the four P-regions is a key component of intact sodium channel selectivity. In addition, the P-region from domain III is significantly voltage-sensitive and molecular dynamics simulations show that the C-terminal part of P-regions is mainly helical whilst the N-terminus tends to unfold. Such specializations of the four domains both in gating and selectivity are independently confirmed in recent electrophysiological studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020222514668
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  • 10
    Electronic Resource
    Electronic Resource
    Modification of tribological properties of polyarylate by supercritical fluid impregnation of copper(II) hexafluoroacetylacetonate (1998)
    Springer
    Tribology letters 5 (1998), S. 297-301 
    Details
    ISSN: 1573-2711
    Keywords: tribological properties ; wear resistance ; polymer ; supercritical fluid ; impregnation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polyarylate has been used as a model polymer to study its tribological property alteration during impregnation of copper(II) hexafluoroacetylacetonate in a supercritical carbon dioxide environment followed by thermal decomposition of the copper compound in air. The initial, impregnated and thermally treated polymer samples were tested by various tribological techniques to compare their wear resistance, friction coefficient fk and surface microhardness H. SEM, EDX and ESCA have been applied to determine surface and internal domain morphology, profiles of copper complex concentration, its types and influence on the tribological properties of the samples. Dramatic surface layer modification and significant enhancement of its wear resistance (more than 400%) due to this process have been observed and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019110228703
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