A5005970338- Logic, Reasoning, and Knowledge
- Logic, programming, and type systems
- Multi-Agent Systems and Negotiation
- Advanced Algebra and Logic
- Semantic Web and Ontologies
- Formal Methods in Verification
- Auction Theory and Applications
- Business Process Modeling and Analysis
- Constraint Satisfaction and Optimization
- Catalytic Processes in Materials Science
- Mathematics, Computing, and Information Processing
- Mobile Agent-Based Network Management
- Polyoxometalates: Synthesis and Applications
- Catalysis and Hydrodesulfurization Studies
- Natural Language Processing Techniques
- Catalysis and Oxidation Reactions
- Iron oxide chemistry and applications
- AI-based Problem Solving and Planning
- Intelligent Tutoring Systems and Adaptive Learning
- Material Dynamics and Properties
- X-ray Diffraction in Crystallography
- Teaching and Learning Programming
- Experimental Learning in Engineering
- Chemical Synthesis and Characterization
- Theoretical and Computational Physics
Technical University of Denmark
2015-2024
Roskilde University
2002-2020
Institute of Mathematics and Mathematical Modeling
2007
Aarhus University
2000
Haldor Topsoe (Denmark)
1984-2000
Odense University Hospital
1993
University of Copenhagen
1992
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExtended x-ray absorption fine structure study of the cobalt-molybdenum hydrodesulfurization catalystsBjerne S. Clausen, Henrik Topsoe, Roberto Candia, Jorgen Villadsen, Bruno Lengeler, Jens Als-Nielsen, and Finn ChristensenCite this: J. Phys. Chem. 1981, 85, 25, 3868–3872Publication Date (Print):December 1, 1981Publication History Published online1 May 2002Published inissue 1 December...
Abstract The changes, which take place in the structural and catalytic properties of Co‐Mo/Al 2 O 3 catalysts sulfided at different temperatures, have been elucidated by means high resolution electron microscopy (HREM), ir, XRD, chemisorption oxygen. It was observed that temperature sulfiding induces a growth Co‐Mo‐S crystals are MoS ‐like with Co occupying edge positions. For all catalysts, found to be most important feature determining HDS activity it occur activity, can explained terms...
Iron pentacarbonyl has been thermally decomposed in an organic liquid. M\"ossbauer spectroscopy and x-ray diffraction studies show that the sample contains small particles of a metallic glass. Annealing at 523 K results crystallization into mixture \ensuremath{\alpha}-Fe \ensuremath{\chi}-${\mathrm{Fe}}_{5}$${\mathrm{C}}_{2}$. The mechanism glass formation is discussed.
We present an approach for testing student learning outcomes in a course on automated reasoning using the Isabelle proof assistant. The allows us to test both general understanding of formal proofs various logical systems and higher-order logic Isabelle/HOL particular. use enables almost automatic grading large parts exam. explain our through number example problems, why we believe that each kinds problems have selected are adequate measures intended outcomes. Finally, discuss experiences...
Proof assistants are important tools for teaching logic. We support this claim by discussing three formalizations in Isabelle/HOL used a recent course on automated reasoning. The first is formalization of System W (a system classical propositional logic with only two primitive symbols), the second Natural Deduction Assistant (NaDeA), and third one-sided sequent calculus that uses our Sequent Calculus Verifier (SeCaV). describe each turn, concentrating how we them teaching, commenting...
Abstract We formalize in Isabelle/HOL soundness and completeness of a one-sided sequent calculus for first-order logic. The is shown via translation from semantic tableau calculus, whose proof we base on the theory entry ‘First-Order Logic According to Fitting’ by Berghofer Archive Formal Proofs. calculi techniques are taken Ben-Ari’s textbook Mathematical Computer Science (Springer, 2012). thereby demonstrate that Berghofer’s approach works not only natural deduction but also constitutes...
We describe SeCaV, a sequent calculus verifier for first-order logic in Isabelle/HOL, and the SeCaV Unshortener, an online tool that expands succinct derivations into full syntax. leverage power of Isabelle/HOL as proof checker our derivations. The interactive features make system transparent. For instance, user can simply click on side condition to see its exact definition. Our formalized soundness completeness proofs pertain exactly exposed not just some model tool. Users also write their...
We certify in the proof assistant Isabelle/HOL soundness of a declarative first-order prover with equality. The LCF-style is translation we have made, to Standard ML, John Harrison's Handbook Practical Logic and Automated Reasoning. it by replacing its kern el certified version that program, generate code from; all Isabelle/HOL. In each step declared, similar sentences thorough paper proof. allows proofs mix style automatic theorem proving using tableau prover. Our motivation teaching how...