Til hovedinnhold

Ivar Johan Halvorsen

Seniorforsker

Ivar Johan Halvorsen

Seniorforsker

Ivar Johan Halvorsen
Telefon: +47 930 59 359
Avdeling: Mathematics and Cybernetics
Kontorsted: Trondheim

Publikasjoner og ansvarsområder

Publikasjoner

Publikasjon

Low-Frequency EIS intercept as a Diagnostic Tool for PEM Fuel Cells Degradation

https://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1534610

Abstract - Several diagnostic tests, such as polarization curves, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV), were conducted periodically to monitor performance degradation during an accelerated stress test (AST) for catalyst degradation on a single proton exchange mem...

Forfattere Pivac Ivan Halvorsen Ivar Johan Bezmalinovic Dario Barbir Frano Zenith Federico
År 2017
Type Konferansebidrag og faglig presentasjon
Publikasjon

Control of Reversible Degradation Mechanisms in Fuel Cells: Mitigation of CO contamination

https://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1420615

Fuel Cells are subject to several degradation phenomena where some are reversible and some irreversible. Normally all contribute to a reduced cell voltage, but it may be complicated to discriminate the particular causes. A brief overview is given and a method for modelling and controlling the partic...

Forfattere Tjønnås Johannes Zenith Federico Halvorsen Ivar Johan Klages Merle Scholta Joachim
År 2016
Type Tidsskriftspublikasjon
Publikasjon

Handling of variable wireless latency and updating frequency in PI controllers

https://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1420602

In closed loop process control with wireless measurements it must be ensured that communication packet dropouts and variable latency is handled properly with respect to the impact on the controlled process. A procedure for automatic adjustment of the controller parameters is presented. The main prop...

År 2016
Type Tidsskriftspublikasjon
Publikasjon

Dividing-Wall Column for Fractionation of Natural Gas Liquids in Floating Liquefied Natural Gas Plants

https://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1414000

The development of floating liquefied natural gas (FLNG) plants has resulted in a focus on reducing the weight and size of the topside processing facilities for these units. The conventional fractionation of natural gas liquids (NGL) in LNG plants implies a direct sequence of three or more conventio...

Forfattere Halvorsen Ivar Johan Dejanovic Igor Maråk Knut Arild Olujic Zarko Skogestad Sigurd
År 2016
Type Tidsskriftspublikasjon
Publikasjon

Dual Control of low concentration CO poisoning by Anode Air Bleeding of Low Temperature Polymer Electrolyte Membrane Fuel Cells

https://www.sintef.no/publikasjoner/publikasjon/?pubid=CRIStin+1392386

Fuel impurities, fed to a polymer electrolyte membrane fuel cell, can affect stack performance by poisoning of catalyst layers. This paper describes the dynamic behaviour of a stack, including state-of-the-art membrane electrode assemblies (MEA) of three different manufacturers, at different operati...

Forfattere Klages Merle Tjønnås Johannes Zenith Federico Halvorsen Ivar Johan Scholta Joachim
År 2016
Type Tidsskriftspublikasjon
Vis alle publikasjoner hos Cristin