Rigorous design of distillation columns using surrogate models based on Kriging interpolation

The economic design of a distillation column or distillation sequences is a challenging problem that has been addressed by superstructure approaches. However, these methods have not been widely used because they lead to mixed-integer nonlinear programs that are hard to solve, and require complex initialization procedures. In this article, we propose to address this challenging problem by substituting the distillation columns by Kriging-based surrogate models generated via state of the art distillation models. We study different columns with increasing difficulty, and show that it is possible to get accurate Kriging-based surrogate models. The optimization strategy ensures that convergence to a local optimum is guaranteed for numerical noise-free models. For distillation columns (slightly noisy systems), Karush–Kuhn–Tucker optimality conditions cannot be tested directly on the actual model, but still we can guarantee a local minimum in a trust region of the surrogate model that contains the actual local minimum.

Putin’s grand design to destroy the EU’s Eastern Partnership and replace it with a disastrous neighbourhood policy of his own. CEPS Commentary, 17 September 2013

This new Commentary by Michael Emerson and Hrant Kostanyan shows how the pressure exerted by President Putin on Armenia to withdraw from the Deep and Comprehensive Free Trade Agreement it had negotiated with the EU and to join the Belarus, Kazakhstan and Russia customs union is but the most recent in a long series of ongoing moves by Russia to destroy the Eastern Partnership. In their view, the message to be hammered home to those unsure of the economic arguments is that you do not have to have an exclusive customs union to enjoy deep integration for goods, services, people and capital, and of course even less for hard security relationships. High-quality free trade agreements are the logical instrument for those who want excellent relations with more than one big neighbour.

Oklahoma W-beam roadside barrier terminal section tests. Final report.

Oklahoma Department of Transportation, Oklahoma City

Rear end structural crashworthiness of perimeter frame vehicles, design development and verification. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Evaluation of design analysis procedures and acceptance criteria for roadside hardware. Volume III - evaluating pre-report 230 crash tests. Final report.

Federal Highway Administration, Safety Design Division, McLean, Va.

Evaluation of design analysis procedures and acceptance criteria for roadside hardware. Volume IV - the importance of the occupant risk criteria. Final report.

Federal Highway Administration, Safety Design Division, McLean, Va.

Evaluation of design analysis procedures and acceptance criteria for roadside hardware. Volume V - hazards of the redirected car. Final report.

Federal Highway Administration, Safety Design Division, McLean, Va.

Median barrier terminals and median treatments. Volume I: research report and appendix A. Final report.

Federal Highway Administration, Safety Design Division, McLean, Va.

Numerical analysis of roadside design (NARD). Volume II: programmers manual. Final report.

Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, McLean, Va.

Numerical analysis of roadside design (NARD). Volume I: users manual. Final report.

Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, McLean, Va.

An energy-absorbing frangible-tube bridge barrier system. Final report.

Mode of access: Internet.

Concrete median barrier research. Volume 1 - executive summary. Final report.

Federal Highway Administration, Office of Research and Development, Washington, D.C.

Concrete median barrier research. Volume 2 - research report. Final report.

Federal Highway Administration, Office of Research and Development, Washington, D.C.

An in-situ permeable reactive barrier for the treatment of hexavalent chromium and trichloroethylene in ground water /

"Project Officer, Robert W. Puls, Subsurface Protection and Remediation Division."

Notice of proposed amendments to design standards for highways - FHWA docket no. 80-2 [Submission].

Mode of access: Internet.