Tapio Westerlund

Publications

Research output per year 1994 2009 2011 2012 2013 2014 2015 2016 2017 2022

• 47 Article
• 24 Conference contribution
• 2 Chapter

Research output per year

Research output per year

Search results

• 2022

  The supporting hyperplane optimization toolkit for convex MINLP

  Lundell, A., Kronqvist, J. & Westerlund, T., 2022, In: Journal of Global Optimization. 41 p.

  Research output: Contribution to journal › Article › Scientific › peer-review

  Open Access

  File

  • Hyperplanes 100%
  • Optimization 85%
  • Nonlinear Programming 57%
  • Mixed Integer Programming 57%
  • Approximation (Algorithm) 57%
  7 Citations (Scopus)

  36 Downloads (Pure)

• Using projected cutting planes in the extended cutting plane method

  Westerlund, T., Eronen, V-P. & Mäkelä, M. M., 2022, In: Optimization. 71, 14, p. 4147-4176 30 p.

  Research output: Contribution to journal › Article › Scientific › peer-review

  Open Access

  File
  1 Citation (Scopus)

  64 Downloads (Pure)
• 2020

  On mixed integer nonsmooth optimization

  Eronen, V-P., Westerlund, T. & Mäkelä, M. M., 2020, Numerical Nonsmooth Optimization: State of the Art Algorithms. Bagirov, A. M., Gaudioso, M., Karmitsa, N., Mäkelä, M. M. & Taheri, S. (eds.). Springer, Cham, p. 549–578 30 p.

  Research output: Chapter in Book/Conference proceeding › Chapter › Scientific › peer-review

  Open Access

  File

  • Optimization 100%
  • Integer 100%
  • Nonconvex Problem 50%
  • Subgradient 50%
  • Functions 50%
  33 Downloads (Pure)
• 2019

  A center-cut algorithm for quickly obtaining feasible solutions and solving convex MINLP problems

  Kronqvist, J., Bernal, DE., Lundell, A. & Westerlund, T., 2019, In: Computers and Chemical Engineering. 122, p. 105–113 9 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  11 Citations (Scopus)
• 2018

  On solving generalized convex MINLP problems using supporting hyperplane techniques

  Westerlund, T., Eronen, V-P. & Mäkelä, M. M., 2018, In: Journal of Global Optimization. 71, 4, p. 987–1011 25 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  7 Citations (Scopus)

• Reformulations for utilizing separability when solving convex MINLP problems

  Kronqvist, J., Lundell, A. & Westerlund, T., 2018, In: Journal of Global Optimization. 71, 3, p. 571–592 22 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  17 Citations (Scopus)

• Solving global optimization problems using reformulations and signomial transformations

  Lundell, A. & Westerlund, T., 2018, In: Computers and Chemical Engineering. 116, p. 122–134

  Research output: Contribution to journal › Article › Scientific › peer-review
  8 Citations (Scopus)
• 2017

  A center-cut algorithm for solving convex mixed-integer nonlinear programming problems

  Kronqvist, J., Lundell, A. & Westerlund, T., 2017, 27 European Symposium on Computer Aided Process Engineering. Espuña, A., Graells, M. & Puigjaner, L. (eds.). Elsevier, p. 2131–2136

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review
  6 Citations (Scopus)

• Application of an extended shrinking film model to limestone dissolution

  Russo, V., Salmi, T., Carletti Guerrero, C., Murzin, D., Westerlund, T., Tesser, R. & Grénman, H., 2017, In: Industrial & Engineering Chemistry Research. 56, 45, p. 13254–13261

  Research output: Contribution to journal › Article › Scientific › peer-review
  6 Citations (Scopus)

• Application of film theory on the reactions of solid particles with liquids: shrinking particles with changing liquid films

  Salmi, T., Russo, V., Carletti Guerrero, C., Kilpiö, T., Tesser, R., Murzin, D., Westerlund, T. & Grénman, H., 2017, In: Chemical Engineering Science. 160, p. 161–170

  Research output: Contribution to journal › Article › Scientific › peer-review
  13 Citations (Scopus)

• Method for solving generalized convex nonsmooth mixed-integer nonlinear programming problems

  Eronen, V-P., Kronqvist, J., Westerlund, T., Mäkelä, M. M. & Karmitsa, N., 2017, In: Journal of Global Optimization. 69, 2, p. 443–459 17 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  8 Citations (Scopus)

• SHOT – A global solver for convex MINLP in Wolfram Mathematica

  Lundell, A., Kronqvist, J. & Westerlund, T., 2017, 27 European Symposium on Computer Aided Process Engineering. Espuña, A., Graells, M. & Puigjaner, L. (eds.). Elsevier, p. 2137–2142

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review
  5 Citations (Scopus)

• Solving 0–1 quadratic programs by reformulation techniques

  Pörn, R., Nissfolk, O., Skjäl, A. & Westerlund, T., 2017, In: Industrial & Engineering Chemistry Research. 56, 45, p. 13444–13453

  Research output: Contribution to journal › Article › Scientific › peer-review
  3 Citations (Scopus)

• Ultrasonic enhanced limestone dissolution: experimental and mathematical modeling

  Carletti Guerrero, C., De Blasio, C., Miceli, M., Pirone, R. & Westerlund, T., 2017, In: Chemical Engineering and Processing. 118, p. 26–36 11 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  16 Citations (Scopus)
• 2016

  A study on supercritical water gasification of black liquor conducted in stainless steel and nickel-chromium-molybdenum reactors

  De Blasio, C., Lucca, G., Özdenkci, K., Mulas, M., Lundqvist, K., Koskinen, J., Santarelli, M., Westerlund, T. & Järvinen, M., 2016, In: Journal of Chemical Technology and Biotechnology. 91, 10, p. 2664–2678 15 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  51 Citations (Scopus)

• Employing a step-wise titration method under semi-slow reaction regime for evaluating the reactivity of limestone and dolomite in acidic environment

  De Blasio, C., Carletti, C., Lundell, A., Visuri, V-V., Kokkonen, T., Westerlund, T., Fabritius, T. & Järvinen, M., 2016, In: Minerals Engineering. 86, p. 43–58 16 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  10 Citations (Scopus)

• Improvements to the Supporting Hyperplane Optimization Toolkit Solver for Convex MINLP

  Lundell, A., Kronqvist, J. & Westerlund, T., 2016, Proceedings of the XIII Global Optimization Workshop, GOW'16, 4-8 September 2016. A. C. Rocha, A. M., Fernanda P. Costa, M. & G. P. Fernandes, E. M. (eds.). Universidade do minho, p. 101–104

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review

• Lifted polyhedral approximations in convex mixed integer nonlinear programming

  Kronqvist, J., Lundell, A. & Westerlund, T., 2016, Proceedings of the XIII Global Optimization Workshop, GOW'16, 4-8 September 2016. A. C. Rocha, A. M., Fernanda P. Costa, M. & G. P. Fernandes, E. M. (eds.). Universidade do minho, p. 117–120

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review

• Revisiting the dissolution kinetics of limestone – experimental analysis and modeling

  Carletti, C., Grénman, H., De Blasio, C., Mäkilä, E., Salonen, J., Murzin, D., Salmi, T. & Westerlund, T., 2016, In: Journal of Chemical Technology and Biotechnology. 91, 5, p. 1517–1531

  Research output: Contribution to journal › Article › Scientific › peer-review
  11 Citations (Scopus)

• Testing the non-diagonal quadratic convex reformulation technique

  Nissfolk, O., Pörn, R. & Westerlund, T., 2016, 26th European Symposium on Computer Aided Process Engineering. Kravanja, Z. (ed.). Elsevier, p. 331–336

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review
  1 Citation (Scopus)

• The effects of physical properties on continuous-operation supercritical water gasification of biomass

  De Blasio, C., Özdenkçi, K., Saqlain, M., Magdeldin, M., Kohl, T., Westerlund, T. & Järvinen, M., 2016, SDEWES Conference : book of abstracts. et al., M. B. (ed.). Faculty of Mechanical Engineering and Naval Architecture, Zagreb, p. 304–

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review

• The extended supporting hyperplane algorithm for convex mixed-integer nonlinear programming

  Kronqvist, J., Lundell, A. & Westerlund, T., 2016, In: Journal of Global Optimization. 64, 2, p. 249–272

  Research output: Contribution to journal › Article › Scientific › peer-review
  53 Citations (Scopus)
• 2015

  Extended cutting plane method for a class of nonsmooth nonconvex MINLP problems

  Eronen, V-P., Mäkelä, M. M. & Westerlund, T., 2015, In: Optimization. 64, 3, p. 641–661 21 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  16 Citations (Scopus)

• Hydrothermal conversion of biomass at supercritical conditions for gaseous fuel production: results, new challenges, and developments

  De Blasio, C., Kohl, T., Magdeldin, M., Westerlund, T. & Järvinen, M., 2015, The International Chemical Congress of Pacific Basin Societies, December 15-20, 2015, Honolulu, Hawaii. p. –

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review

• On modelling the roles played by diffusive and convective transport in limestone dissolution for wet flue gas desulphurisation

  Carletti, C., De Blasio, C., Grénman, H. & Westerlund, T., 2015, In: Chemical Engineering Transactions. 43, p. 2131–2136

  Research output: Contribution to journal › Article › Scientific › peer-review
  2 Citations (Scopus)

• Optimization of a wet flue gas desulfurization scrubber through mathematical modeling of limestone dissolution experiments

  Carletti, C., De Blasio, C., Mäkilä, E., Salonen, J. & Westerlund, T., 2015, In: Industrial & Engineering Chemistry Research. 54, 40, p. 9783–9797

  Research output: Contribution to journal › Article › Scientific › peer-review
  18 Citations (Scopus)

• Representation of the convex envelope of bilinear terms in a reformulation framework for global optimization

  Lundell, A. & Westerlund, T., 2015, In: Computer Aided Chemical Engineering. 37, p. 833–838 6 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  2 Citations (Scopus)
• 2014

  Analysis of solid concentration distribution in dense solid-liquid stirred tanks by electrical resistance tomography

  Carletti, C., Montante, G., Westerlund, T. & Paglianti, A., 2014, In: Chemical Engineering Science. 119, p. 53–64 12 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  69 Citations (Scopus)

• An extended supporting hyperplane algorithm for convex MINLP problems

  Lundell, A., Kronqvist, J. & Westerlund, T., 2014, Proceedings of the XII global optimization workshop : mathematical and applied global optimization, MAGO 2014. Casado, LG., García, I. & Hendrix, EMT. (eds.). p. 21–24

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review

• A novel reactor setup for studying limestone dissolution kinetics

  Carletti, C., Grénman, H., De Blasio, C., Salmi, T., Murzin, D. & Westerlund, T., 2014, XXI International Conference on Chemical Reactors (CHEMREACTOR‐21). Noskov, AS. (ed.). Boreskov Institute of Catalysis of the Siberian Branch of the Russian Academy of Science, p. 198–199

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review

• New methods for calculating α BB-type underestimators

  Skjäl, A. & Westerlund, T., 2014, In: Journal of Global Optimization. 58, 3, p. 411–427 17 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  18 Citations (Scopus)

• On the generalization of ECP and OA methods to nonsmooth convex MINLP problems

  Eronen, V-P., Mäkelä, M. M. & Westerlund, T., 2014, In: Optimization. 63, 7, p. 1057–1073 17 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  21 Citations (Scopus)

• Solid Concentration Distribution In Slurry Stirred Tanks

  Carletti, C., Montante, G., Westerlund, T. & Paglianti, A., 2014, 13th International Conference on Multiphase Flow In Industrial Plants, MFIP13. Di Felice, R. (ed.). Mediterrean Foundation, p. –

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review

• Supercritical water gasification of biomass in tubular reactors, a study from experiments conducted in stainless steel and nickel-chromium-molybdenum catalyst

  De Blasio, C., Lucca, G., Özdenkçi, K., Mulas, M., Lundqvist, K., Koskinen, J., Santarelli, M., Westerlund, T. & Järvinen, M., 2014, 1st South East European Conference on Sustainable Development of Energy, Water and Environment Systems (SEE-SDEWES) 29 June - 3 July, 2014, Ohrid, Republic of Macedonia. Faculty of Mechanical Engineering and Naval Architecture, Zagreb, p. –

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review
• 2013

  A reformulation framework for global optimization

  Lundell, A., Skjäl, A. & Westerlund, T., 2013, In: Journal of Global Optimization. 57, 1, p. 115–141

  Research output: Contribution to journal › Article › Scientific › peer-review
  15 Citations (Scopus)

• Improved discrete reformulations for the quadratic assignment problem

  Nyberg, A., Westerlund, T. & Lundell, A., 2013, Integration of AI and OR Techniques in Constraint Programming for Combinatorial Optimization Problems: 10th International Conference, CPAIOR 2013, Yorktown Heights, NY, USA, May 18-22, 2013. Proceedings. Springer Berlin Heidelberg, p. 193-203 (Lecture Notes in Computer Science; vol. 7874).

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review
  5 Citations (Scopus)

• Limestone dissolution study for wet flue gas desulfurization under turbulent regimes above critical suspension speed

  Carletti, C., Grénman, H., De Blasio, C. & Westerlund, T., 2013, In: Computer Aided Chemical Engineering. 32, p. 301–306 6 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  2 Citations (Scopus)

• Modeling limestone reactivity and sizing the dissolution tank in wet flue gas desulfurization scrubbers

  Carletti, C., Bjondahl, F., De Blasio, C., Ahlbeck, J., Järvinen, L. & Westerlund, T., 2013, In: Environmental Progress and Sustainable Energy. 32, 3, p. 663–672 10 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  22 Citations (Scopus)

• On modeling the dissolution of sedimentary rocks in acidic environments. An overview of selected mathematical methods with presentation of a case study

  De Blasio, C., Carletti, C., Westerlund, T. & Järvinen, M., 2013, In: Journal of Mathematical Chemistry. 51, 8, p. 2120–2143

  Research output: Contribution to journal › Article › Scientific › peer-review
  8 Citations (Scopus)

• On the reactivity of carbonate rocks utilized in wet flue gas desulfurization: modeling the reaction kinetics of solid particles by a step-wise titration method with turbulent conditions

  De Blasio, C., Carletti Guerrero, C., Westerlund, T. & Järvinen, M., 2013, 5th International Conference on Applied Energy, South Africa, July 1-4, 2013. University of Pretoria, p. –

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review

• Refinement strategies for piecewise linear functions utilized by reformulation-based techniques for global optimization

  Lundell, A. & Westerlund, T., 2013, In: Computer Aided Chemical Engineering. 32, p. 529–534 6 p.

  Research output: Contribution to journal › Article › Scientific › peer-review

• The reformulation-based αGO algorithm for solving nonconvex MINLP problems - some improvements

  Lundell, A. & Westerlund, T., 2013, 11th International Conference on Chemical and Process Engineering - selected papers of ICheaP11. Pierucci, S. & Klemeš, J. J. (eds.). Associazione Italiana di Ingegneria Chimica, p. 1321–1326 6 p.

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review
  1 Citation (Scopus)
• 2012

  Finding an optimized set of transformations for convexifying nonconvex MINLP problems

  Lundell, A., Andreas, Westerlund, T. & Tapio, 2012, 11th International Symposium on Process Systems Engineering. A Karimi, I. & Srinivasan, R. (eds.). Elsevier, p. 1497–1501 5 p.

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review
  3 Citations (Scopus)

• Global optimization of mixed-integer signomial programming problems

  Lundell, A. & Westerlund, T., 2012, Mixed integer nonlinear programming. Lee, J. & Leyffer, S. (eds.). Springer, p. 349–369

  Research output: Chapter in Book/Conference proceeding › Chapter › Scientific › peer-review

• Modeling the dissolution of carbonate minerals utilized in Flue Gas Desulfurization scrubbers. A stepwise titration technique applied to low Grashof-Reynolds ratio

  De Blasio, C., Carletti, C., Lundqvist, K., Saeed, L., Westerlund, T. & Fogelholm, C-J., 2012, In: Computer Aided Chemical Engineering. 31, p. 465–469

  Research output: Contribution to journal › Article › Scientific › peer-review
  1 Citation (Scopus)

• Use of Carbonate Rocks for Flue Gas Desulfurization: Reactive dissolution of limestone particles

  De Blasio, C., Mäkilä, E. & Westerlund, T., 2012, In: Applied Energy. 90, 1, p. 175–181

  Research output: Contribution to journal › Article › Scientific › peer-review
  21 Citations (Scopus)
• 2011

  Evaluating the reactivity of limestone utilized in flue gas desulfurization. An application of the Danckwerts theory for particles reacting in acidic environments and agitated vessels with Archimedes number less than 40.

  De Blasio, C., Carletti, C., Järvinen, L. & Westerlund, T., 2011, 21st European Symposium on Computer Aided Process Engineering - ESCAPE21. N. Pistikopoulos, E., C. Georgiadis, M. & C. Kokossis, A. (eds.). Elsevier, p. –

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review

  File
  2 Citations (Scopus)

  18 Downloads (Pure)

• Global Optimization with C^2 Constraints by Convex Reformulations

  Skjäl, A., Lundell, A. & Westerlund, T., 2011, In: Chemical Engineering Transactions. 24, p. 373–378 6 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  2 Citations (Scopus)

• On convex relaxations in nonconvex optimization

  Westerlund, T., Tapio, Lundell, A., Andreas, Westerlund & Joakim, 2011, In: Chemical Engineering Transactions. 24, p. 331–336 6 p.

  Research output: Contribution to journal › Article › Scientific › peer-review
  6 Citations (Scopus)

• Some notes on convex relaxations

  Westerlund, T., Lundell, A. & Westerlund, J., 2011, Tenth International Conference on Chemical and Process Engineering ICheaP-10. Pierucci & Sauro (eds.). Associazione Italiana di Ingegneria Chimica, p. 383–392

  Research output: Chapter in Book/Conference proceeding › Conference contribution › Scientific › peer-review