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  • Journal article
    Law VJ, Kenyon AJ, Thornhill NF, Srigengan V, Batty Iet al., 2000,

    , VACUUM, Vol: 57, Pages: 351-364, ISSN: 0042-207X
    • Cite
    • Citations: 17
  • Journal article
    Pate ME, Turner MK, Thornhill NF, Titchener-Hooker NJet al., 1999,

    , BIOPROCESS ENGINEERING, Vol: 21, Pages: 261-272, ISSN: 0178-515X
  • Journal article
    Koh ATC, Thornhill NF, Law VJ, 1999,

    , ELECTRONICS LETTERS, Vol: 35, Pages: 1383-1385, ISSN: 0013-5194
    • Cite
    • Citations: 13
  • Journal article
    Yeung KSY, Hoare M, Thornhill NF, Williams T, Vaghjiani JDet al., 1999,

    , BIOTECHNOLOGY AND BIOENGINEERING, Vol: 63, Pages: 684-693, ISSN: 0006-3592
    • Cite
    • Citations: 43
  • Journal article
    Thornhill NF, Oettinger M, Fedenczuk P, 1999,

    , JOURNAL OF PROCESS CONTROL, Vol: 9, Pages: 109-124, ISSN: 0959-1524
    • Cite
    • Citations: 98
  • Journal article
    Pate ME, Thornhill NF, Chandwani R, Hoare M, Titchener-Hooker NJet al., 1998,

    , BIOPROCESS ENGINEERING, Vol: 19, Pages: 297-305, ISSN: 0178-515X
  • Conference paper
    Thornhill NF, Oettinger M, Fedenczuk P, 1998,

    Performance assessment and diagnosis of refinery control loops

    , 3rd International Conference on Foundations of Computer-Aided Process Operations, Publisher: AMER INST CHEMICAL ENGINEERS, Pages: 373-379, ISSN: 0065-8812
  • Conference paper
    Zhang J, Zhang S, Thornhill N, 1998,

    , Pages: 2472-2476, ISSN: 0743-1619

    This paper describes a governing equation fault detection and diagnosis algorithm, which is based on Kramer (1987) and extended to deal with multiple faults. The algorithm is specifically designed to overcome disturbances and uncertainties in the process which might result in diagnostic instability. The approach is used to detect and/or diagnose the following faults: sensor faulty status of fails-high and fails-low, sticking valve, plant leaks, and other unanticipated or novel faults. The algorithm was installed on a distributed control system (DCS) of a PET plant in Dec. 1995, and continues to be used thus demonstrating the success of the fault detection and diagnosis approach. © 1998 AACC.
  • Journal article
    Alheritiere C, Thornhill NF, Fraser S, Knight MJet al., 1998,

    , COMPUTERS & CHEMICAL ENGINEERING, Vol: 22, Pages: S1031-S1034, ISSN: 0098-1354
  • Conference paper
    Sabry M, Thornhill NF, Midwinter JE, 1997,

    An analytical approach to charging mechanisms using control theory

    , ISSN: 0963-3308

    In this paper we suggest how control theory may be used to model and analytically analyse telecommunication network charging mechanisms. We propose a control theory model which was used to analyse the dynamic (also known as 'Smart Market' or 'Free Market') charging scheme. We show how the analytical model was formalised and analysed to determine the long term or Steady State (SS), in control theory terminology, and short term or transient responses of the mechanism. We show how the system's performance varies as the parameters change. We also discuss the limitations of this method of analysis and in particular how this affects the results of the dynamic charging scheme analysis.
  • Journal article
    Thornhill NF, Hagglund T, 1997,

    , CONTROL ENGINEERING PRACTICE, Vol: 5, Pages: 1343-1354, ISSN: 0967-0661
    • Cite
    • Citations: 112
  • Journal article
    Chandwani RM, Pate ME, Savery J, Thornhill NF, Horstmann B, Hoare M, TitchenerHooker NJet al., 1997,

    , BIOPROCESS ENGINEERING, Vol: 17, Pages: 229-234, ISSN: 0178-515X
  • Journal article
    Gregory ME, Thornhill NF, 1997,

    , BIOPROCESS ENGINEERING, Vol: 16, Pages: 339-344, ISSN: 0178-515X
    • Cite
    • Citations: 10
  • Journal article
    Dehghani M, Bulmer M, Gregory ME, Ison AP, Thornhill NFet al., 1996,

    On-line recognition of CO<inf>2</inf>exit gas profiles for operational harvesting time of intracellular enzyme products from S. cerevisiae

    , Bioprocess and Biosystems Engineering, Vol: 16, Pages: 50-55, ISSN: 1615-7591

    This paper concerns the recognition of significant events in the trends from CO2exit gas profiles of a S.cerevisiae fermentation. Distinct changes in the on-line monitored variable, CO2exit gas concentration, are used to recognise identifiable phases of glucose depletion, biomass formation and the onset of intracellular enzyme production. Process automation for the harvesting of some intracellular enzyme products from S. cerevisiae is considered using on-line recognition of CO2exit gas peaks.
  • Journal article
    Dehghani M, Bulmer M, Gregory ME, Ison AP, Thornhill NFet al., 1996,

    , BIOPROCESS ENGINEERING, Vol: 16, Pages: 50-55, ISSN: 0178-515X
  • Journal article
    Thornhill NF, Hutchinson RJ, Haughie BT, 1996,

    , JOURNAL OF PROCESS CONTROL, Vol: 6, Pages: 161-167, ISSN: 0959-1524
  • Journal article
    Bogle IDL, Cockshott AR, Bulmer M, Thornhill N, Gregory M, Dehghani Met al., 1996,

    , COMPUTERS & CHEMICAL ENGINEERING, Vol: 20, Pages: 943-949, ISSN: 0098-1354
  • Conference paper
    Thornhill NF, Sadowski R, Davis JR, Fedenczuk P, Knight MJ, Prichard P, Rothenberg Det al., 1996,

    , UKACC International Conference on Control '96, 2-5 September 1996, Pages: 175-180, ISSN: 0537-9989

    The paper presents an example of the application of a control loop performance assessment technique in a refinery setting and diagnoses the causes of oscillations in flow loops.
  • Journal article
    DEHGHANI M, BULMER M, GREGORY ME, THORNHILL NFet al., 1995,

    , BIOPROCESS ENGINEERING, Vol: 13, Pages: 239-243, ISSN: 0178-515X
  • Conference paper
    THORNHILL NF, 1995,

    MEASUREMENT-INDEPENDENT TEST THRESHOLDS IN STATISTICAL PROCESS ANALYSIS

    , 1st European Conference for Young Researchers in Chemical Engineering - The 1995 IChemE Research Event, Publisher: INST CHEMICAL ENGINEERS, Pages: 77-79

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