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  • Analytical Chemistry and Spectroscopy  (2)
  • quadratic programming  (2)
  • 1
    Electronic Resource
    Electronic Resource
    On the use of an inverse shortest paths algorithm for recovering linearly correlated costs (1994)
    Springer
    Mathematical programming 63 (1994), S. 1-22 
    Details
    ISSN: 1436-4646
    Keywords: Graph theory ; shortest paths ; inverse problems ; quadratic programming ; traffic modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract This paper considers the inverse shortest paths problem where arc costs are subject to correlation constraints. The motivation for this research arises from applications in traffic modelling and seismic tomography. A new method is proposed for solving this class of problems. It is constructed as a generalization of the algorithm presented in Burton and Toint (Mathematical Programming 53, 1992) for uncorrelated inverse shortest paths. Preliminary numerical experience with the new method is presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01582056
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  • 2
    Electronic Resource
    Electronic Resource
    On an instance of the inverse shortest paths problem (1992)
    Springer
    Mathematical programming 53 (1992), S. 45-61 
    Details
    ISSN: 1436-4646
    Keywords: Graph theory ; shortest paths ; inverse problems ; quadratic programming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract The inverse shortest paths problem in a graph is considered, that is, the problem of recovering the arc costs given some information about the shortest paths in the graph. The problem is first motivated by some practical examples arising from applications. An algorithm based on the Goldfarb-Idnani method for convex quadratic programming is then proposed and analyzed for one of the instances of the problem. Preliminary numerical results are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01585693
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  • 3
    Electronic Resource
    Electronic Resource
    Reproducibility of the determination of caffeine in coffee by micellar electrokinetic capillary chromatography (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 6 (1994), S. 5-10 
    Details
    ISSN: 1040-7685
    Keywords: caffeine ; coffee ; micellar electrokinetic capillary chromatography (MECC) ; reproducibility ; HPLC ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Samples of regular and decaffeinated varieties of green coffee beans, instant coffee, and “roast & grind” coffee have been examined by micellar electrokinetic capillary chromatography (MECC). The separation conditions affecting the reproducibility of the determination of caffeine in these samples are presented. Sodium dodecyl sulfate (SDS) and cetyltrimethylammonium chloride (CTAC) Were employed to demonstrate the role of the surfactant system in reproducibility. The use of NaOH and HCl was explored for column rinsing to enhance the stability of the electroosmotic flow. The levels of caffeine ranged from 3.95% (by weight) for regular coffee to 0.07% for decaffeinated coffee. The relative standard deviation (RSD) for the migration time of the peak corresponding to caffeine in coffee samples was 0.74%. The RSDs for the peak areas and heights were 1.04 and 2.07%, respectively. The results of the quantitation of caffeine by MECC are compared to levels determined by high-performance liquid chromatography (HPLC).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220060103
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  • 4
    Electronic Resource
    Electronic Resource
    Current measurement of nonaqueous solvents: Applicatons to capillry electrophoresis and electrochromatography (1997)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 20 (1997), S. 523-528 
    Details
    ISSN: 0935-6304
    Keywords: Nonaqueous solvents ; Capillary electrophoresis ; Capillary electrochromatography ; Current measurement ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The solvents acetonitrile, methanol, N, N-dimethylformamide, dimethyl sulfoxide, formamide, and deionized water were investigated for their ability to support current flow without added electrolyte. Using open tubular capillary electrophoresis, currents were measured to be in the nanoampere (10-9 A) range for all solvents but formamide (10-6 A). Comparisons with flow data showed no clear relationship between current and electroosmotic flow. Packed capillary columns (3-μm ODS) were used for separations using both pure solvent and hydrophobic dyes showed mild retention in pure ACN. A 16 polynuclear aromatic hydrocarbon (PAH) standard soluton was separated in 80/20 ACN/H2O with reduced plate heights (h) between 2.8 and 3.1 for retained species. A separation of nine androstenediones was achieved using a 70/30 MeOH/H2O mobile phase.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240201003
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