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

  Remote-coupled sensing of plasma harmonics and process end-point detection

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

  The use of principal component analysis for the modelling of high performance liquid chromatography

  , BIOPROCESS ENGINEERING, Vol: 21, Pages: 261-272, ISSN: 0178-515X
  • Author Web Link
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  • Citations: 8
• Journal article
  Koh ATC, Thornhill NF, Law VJ, 1999,

  Principal component analysis of plasma harmonics in end-point detection of photoresist stripping

  , ELECTRONICS LETTERS, Vol: 35, Pages: 1383-1385, ISSN: 0013-5194
  • Author Web Link
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  • Citations: 12
• Journal article
  Yeung KSY, Hoare M, Thornhill NF, Williams T, Vaghjiani JDet al., 1999,

  Near-infrared spectroscopy for bioprocess monitoring and control

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

  Refinery-wide control loop performance assessment

  , JOURNAL OF PROCESS CONTROL, Vol: 9, Pages: 109-124, ISSN: 0959-1524
  • Author Web Link
  • Open Access Link
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  • Citations: 97
• Journal article
  Pate ME, Thornhill NF, Chandwani R, Hoare M, Titchener-Hooker NJet al., 1998,

  Pre-processing of chromatographic data for principal component analysis

  , BIOPROCESS ENGINEERING, Vol: 19, Pages: 297-305, ISSN: 0178-515X
  • Author Web Link
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  • Citations: 2
• 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
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  • Citations: 6
• Conference paper
  Zhang J, Zhang S, Thornhill N, 1998,

  A governing equation based fault detection and diagnosis algorithm and its application in a chemical plant

  , 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.

  • Abstract
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• Journal article
  Alheritiere C, Thornhill NF, Fraser S, Knight MJet al., 1998,

  Cost benefit analysis of refinery process data: Case study

  , COMPUTERS & CHEMICAL ENGINEERING, Vol: 22, Pages: S1031-S1034, ISSN: 0098-1354
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  • Citations: 9
• 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.

  • Abstract
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  • Citations: 1
• Journal article
  Thornhill NF, Hagglund T, 1997,

  Detection and diagnosis of oscillation in control loops

  , CONTROL ENGINEERING PRACTICE, Vol: 5, Pages: 1343-1354, ISSN: 0967-0661
  • Author Web Link
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  • Citations: 109
• Journal article
  Chandwani RM, Pate ME, Savery J, Thornhill NF, Horstmann B, Hoare M, TitchenerHooker NJet al., 1997,

  The use of principal component analysis as a database mining tool for the exploratory diagnosis of chromatographic processes

  , BIOPROCESS ENGINEERING, Vol: 17, Pages: 229-234, ISSN: 0178-515X
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  • Citations: 3
• Journal article
  Gregory ME, Thornhill NF, 1997,

  The effects of aeration and agitation on the measurement of yeast biomass using a laser turbidity probe

  , BIOPROCESS ENGINEERING, Vol: 16, Pages: 339-344, ISSN: 0178-515X
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  • Citations: 9
• 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.

  • Abstract
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  • Citations: 2
• Journal article
  Dehghani M, Bulmer M, Gregory ME, Ison AP, Thornhill NFet al., 1996,

  On-line recognition of CO2 exit gas profiles for operational harvesting time of intracellular enzyme products from S-cerevisiae

  , BIOPROCESS ENGINEERING, Vol: 16, Pages: 50-55, ISSN: 0178-515X
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  • Citations: 2
• Journal article
  Thornhill NF, Hutchinson RJ, Haughie BT, 1996,

  A probability chart for statistical process analysis, with applications

  , JOURNAL OF PROCESS CONTROL, Vol: 6, Pages: 161-167, ISSN: 0959-1524
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  • Citations: 1
• Journal article
  Bogle IDL, Cockshott AR, Bulmer M, Thornhill N, Gregory M, Dehghani Met al., 1996,

  A process systems engineering view of biochemical process operations

  , COMPUTERS & CHEMICAL ENGINEERING, Vol: 20, Pages: 943-949, ISSN: 0098-1354
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  • Citations: 9
• Conference paper
  Thornhill NF, Sadowski R, Davis JR, Fedenczuk P, Knight MJ, Prichard P, Rothenberg Det al., 1996,

  Practical experiences in refinery control loop performance assessment

  , 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.

  • Abstract
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• Journal article
  DEHGHANI M, BULMER M, GREGORY ME, THORNHILL NFet al., 1995,

  MEASUREMENT VARIABILITY ANALYSIS FOR FERMENTATION PROCESS ASSAYS

  , BIOPROCESS ENGINEERING, Vol: 13, Pages: 239-243, ISSN: 0178-515X
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  • Citations: 6
• Journal article
  TURNER C, GREGORY ME, THORNHILL NF, 1994,

  CLOSED-LOOP CONTROL OF FED-BATCH CULTURES OF RECOMBINANT ESCHERICHIA-COLI USING ONLINE HPLC

  , BIOTECHNOLOGY AND BIOENGINEERING, Vol: 44, Pages: 819-829, ISSN: 0006-3592
  • Author Web Link
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  • Citations: 42

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