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Check-out MAN Diesel & Turbo “Diesel Facts” publication

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I recently co-authored a draft version of a press release/article on reduced green house gas emissions (GNG) and low methane slip of the new ME-GI duel fuel engine. The ME-GI can be run on both conventional liquid fuel (diesel, heavy fuel oil etc) as well as natural gas. Check out the front page story in “Diesel Facts” 3rd issue 2011.

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November 2, 2011 at 1:51 pm

Where to publish non-physics preprints? or where to find a chemistry preprint server without the arxiv.org like endorsement system?

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A good friend, and former follow graduate student, and I recently finished a scientific manuscript we have been working for some years now. Since we are both out of academia, and busy with other things, putting an article into peer review is not our top priority at the moment. Nevertheless, we would still like the world (or at least a few people) know about our work, and also secure our intellectual property, by not letting others publish the exact same ideas. We came up with the idea of publishing it on a pre-print server, and then time should tell if we would submit to a peer-reviewed journal. The best known (physics) pre-print server is the arxiv.org hosted by Cornell University Library. Although our work probably could be classified into some subtopic physics category, strictly speaking, chemistry would  be more appropriate, chemical kinetics and catalysis to be more accurate. Furthermore, the endorsement system used by arxiv.org is also frustrating, to put it mildly. Once you’re out of research it seems very difficult to get endorsement. I consider my scientific network to be quite broad and large, however I do not know a single soul who can endorse me. Thus, arxiv.org seemed out of the question. Then, where to find a chemistry pre-print server with a less strict endorsement system? It turns out that Nature has started their own pre-print service known as Nature precedings, and they are embracing chemistry. Thank you.  So now our manuscript is public available. As a note to those wanting to publish physics preprints without endorsement (and chemistry as well), the so-called vixra.org (arxiv reversed) is an option. However, I have not been able to really judge the quality of the content being published. Well to be honest the same goes to Nature precedings, but since Nature Scientific Publishing is behind, it sounds better in my ears.

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July 10, 2011 at 9:11 pm

Presentation of paper no. 39 at CIMAC 2010 congress in Bergen available now!

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The presentation accompanying paper no. 39 is available

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October 5, 2010 at 8:05 am

Full text available for CIMAC paper no. 39 2010: Modelling of the oxidation of fuel sulfur in low speed two-stroke engines

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Full text version

Abstract

In large marine two stroke Diesel engines during combustion of sulfur containing fuel, the sulfur is oxidised to SO2 , mainly, although substantial amounts of SO3 and H2SO4 will form as well. These latter species may cause corrosional wear of the cylinder liner if not neutralised by lube oil additives. Potential attacks is due to either condensation of sulfuric acid on the cylinder liner lube oil film or direct dissolution of oxidised sulfur species in the lube oil film in which reaction with dissolved water may be the source of acidic species. In order to evaluate and predict corrosional wear of the liner material, it is pivotal to have realistic estimates of the distribution/concentration of oxidised sulfur species as well as a reliable model of
formation, transport and destruction of acidic species in the oil film. This paper addresses the former part by invoking a detailed reaction mechanism in order to simulate the oxidation of fuel bound sulfur and predicting the concentration of SO2 as well as the conversion fraction into SO3 and H2 SO4 . The reaction mechanism is coupled to a realistic model of the combustion process in which the air entrainment into the combustion zone is accounted for. The results of the simulation are evaluated with respect to previously applied models as well as existing data on the conversion fraction of SO2 to SO3 and H2 SO4 . The conversion fraction is found to be in a range of 2.6-6.7 %.

A pivotal part for the creation of the above paper has been the usage of the Cantera software for handling thermodynamics and integration of kinetic rate equations.

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June 22, 2010 at 10:13 am

Another paper accepted for the 2010 CIMAC Congress in Bergen

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I have authored a paper entitled “Modelling of the oxidation of fuel sulfur in low speed two-stroke Diesel engines ” in collaboration with my colleague Stefan Mayer from the Process Development Department, Marine Low-Speed, MAN Diesel in Copenhagen. The paper has just been accepted for publication for the 2010 CIMAC congress held in Bergen, Norway, and will be presented by myself at the congress on Wednesday 16th of June in the morning between 8.30 and 10.00 in Room C (according to the preliminary programme).

In the paper a detailed a detailed reaction mechanism is used in order to simulate the oxidation of fuel bound sulfur and predicting the concentration of SO2 as well as the conversion fraction into SO3 and H2SO4 . The reaction mechanism is coupled to a realistic model of the combustion process in which the air entrainment into the combustion zone is accounted for. The results of the simulation are evaluated with respect to previously applied models as well as existing data on the conversion fraction of SO2 to SO3 and H2SO4. The conversion fraction is found to be in a range of 2.6-6.7 %.

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April 29, 2010 at 11:34 am

Paper accepted for upcoming CIMAC congress in Bergen

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I have co-authored a paper entitled “TWO-STROKE ENGINE EMISSION REDUCTION
TECHNOLOGY: STATE-OF-THE-ART” in collaboration with my colleagues Michael Finch Pedersen and Stefan Mayer from the Process Development Department, Marine Low-Speed, MAN Diesel in Copenhagen. The paper has just been accepted for publication for the 2010 CIMAC congress held in Bergen, Norway, and will be presented by Michael Finch Pedersen at the congress on Tuesday 15th of June in the afternoon after 15.30 in Room B (according to the preliminary programme).

In the paper we present recent results on reducing the emission of pollutants from large two-stroke marine engines. We focus on primary methods, i.e. emission reductions obtained by in-cylinder methods in order to suppress emission formation. The methods presented are retrofit of fuel atomizers, water-in-fuel emulsion (WIF), exhaust gas recirculation (EGR) and a combination of WIF and EGR.

Perspective in Science Mag

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norskov_science

Nørskov et al. recently wrote a perspective in Science Magazine entitled “Rate Control and Reaction Engineering”  with a short description “A concept for evaluating. the relative importance of steps in complex reactions may guide the development of better catalysts”. The article also addresses our recently published paper “Degree of Rate Control: How Much the Energies of Intermediates and Transition States Control Rates” in JACS. Thanks guys!

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July 18, 2009 at 8:30 am