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Sökning: WFRF:(Paul J) > Mälardalens universitet

  • Resultat 1-10 av 15
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1.
  • Nagaraja, Ch., et al. (författare)
  • Opening remarks
  • 2016
  • Konferensbidrag (refereegranskat)
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2.
  • Steen, Robert O., et al. (författare)
  • The role of isomeric effects on the luminescence lifetimes and electrochemistry of oligothienyl-bridged dinuclear tris(2,2′-bipyridine) ruthenium(II) complexes
  • 2008
  • Ingår i: European Journal of Inorganic Chemistry. - : Wiley. - 1434-1948 .- 1099-0682. ; :11, s. 1784-1794
  • Tidskriftsartikel (refereegranskat)abstract
    • The luminescence lifetimes (in CH 3CN at room temperature) and electrochemical potentials (in CH 3CN) of a range of mono- and bis(bidentate) 2,2′-bipyridine-capped oligothiophene-bridged Ru II complexes based on the 6-(2-thienyl)-2,2′-bipyridine and 4-(2-thienyl)-2,2′-bipyridine motifs have been measured. The redox potentials occurred in a very narrow range and showed only small shifts from that of [Ru(bpy) 3] 2+, which indicates that the inductive effects of the substituents on the 2,2′-bipyridine ligands are very similar across this series. In the complexes that incorporated a bithiophene moiety the oxidation of the bithienyl group occurred at higher potentials than the metal-centered Ru III/II oxidation. No or very weak interaction between the metal cores in the dinuclear complexes was observed. It was found that the luminescence lifetimes of the complexes where the attachment point of the oligothiophene bridge is in the 4-position of a 2,2′-bipyridine ligand were extended compared to [Ru(bpy) 3] 2+, whereas the luminescence was very short-lived (<30 ns) or completely quenched in the complexes where the oligothiophene bridge was attached in the 6-position. The difference in lifetimes is probably due to steric interactions between the thienyl bridge and the auxiliary bipyridyl ligands, resulting in disturbances in coordination symmetry of the metal core.
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3.
  • David, A., et al. (författare)
  • Tools for Model-Checking Timed Systems
  • 2013
  • Ingår i: Communicating Embedded Systems: Software and Design: Formal Methods. - : John Wiley & Sons, Inc.. - 9781848211438 ; , s. 165-225
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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4.
  • Steen, Robert O., 1978-, et al. (författare)
  • Bis-cyclometallated Molecular Switches Based on 4,7-phenantroline and 1,5-naphthyridine Architecture
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • Two new bis-terdentate ligands,  3,8-bis-(6-thiophen-2-yl-pyridin-2-yl)-[4,7]phenanthroline (L1) and 2,6-bis(6-(thiophen-2-yl)pyridin-2-yl)-1,5-naphthyridine (L2), capable of reversible double cyclometallation have been synthesized. Both syntheses proceeded via a Skraup synthesis followed by Stille cross-coupling with 2-thiophen-2-yl-6-tributylstannylpyridine to yield the final product. The Ru2(tpy)2-complex of L1 was shown to be capable of reversible cyclometallation, where the bis-cyclometallated (C,C) isomer of the complex had an oxidation potential of +249 mV while the oxidation potential of the doubly S-coordinated (S,S) complex was +987 mV. No ground state interaction between the Ru cores was however found. In theory the complex should display a third, mixed, state. An S,C-coordinated isomer would open the way for molecular electronic applications based on ternary logic. However, despite attempts the S,C-coordinated complex could not be generated.
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5.
  • Steen, Robert O., 1978-, et al. (författare)
  • Coordination-mode pH-activated Molecular Switches based on Ruthenium(II) Oligopyridine Complex Architecture
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • A number of [Ru(tpy)L] complexes (where L is a ligand based on the 6-thien-2-yl-2,2’-bipyridine motif) have been generated to study the ability of this terdentate motif to switch between a N,N,C and a N,N,S binding mode as a function of pH and irradiation. Whilst the parent system 6-thien-2-yl-2,2’-bipyridine (1) displayed facile switching between the orange and purple forms, heavier analogues displayed sluggish switching – most likely resulting from a large moment of inertia about the bond between the S/C-bonded thiophene ring and the chelating bipyridine unit. Prototypic unsymmetrical bimetallic complexes (C7S and C7C) have been generated in order to test if the binding mode of the switching unit can affect the oxidation potential of the remote [Ru(bpy)2(L)] unit. The results of cyclic voltammetry studies suggest that only weak electronic coupling between the metal cores exists, and that the coordination mode (N,N,C or N,N,S) of the thiophene moiety only has a small effect on the oxidation potential of the [Ru(bpy)2(L)] unit.
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7.
  • Ayerdi, J., et al. (författare)
  • Towards a Taxonomy for Eliciting Design-Operation Continuum Requirements of Cyber-Physical Systems
  • 2020
  • Ingår i: Proceedings of the IEEE International Conference on Requirements Engineering. - : IEEE Computer Society. - 9781728174389 ; , s. 280-290
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • Software systems that are embedded in autonomous Cyber-Physical Systems (CPSs) usually have a large life-cycle, both during its development and in maintenance. This software evolves during its life-cycle in order to incorporate new requirements, bug fixes, and to deal with hardware obsolescence. The current process for developing and maintaining this software is very fragmented, which makes developing new software versions and deploying them in the CPSs extremely expensive. In other domains, such as web engineering, the phases of development and operation are tightly connected, making it possible to easily perform software updates of the system, and to obtain operational data that can be analyzed by engineers at development time. However, in spite of the rise of new communication technologies (e.g., 5G) providing an opportunity to acquire Design-Operation Continuum Engineering methods in the context of CPSs, there are still many complex issues that need to be addressed, such as the ones related with hardware-software co-design. Therefore, the process of Design-Operation Continuum Engineering for CPSs requires substantial changes with respect to the current fragmented software development process. In this paper, we build a taxonomy for Design-Operation Continuum Engineering of CPSs based on case studies from two different industrial domains involving CPSs (elevation and railway). This taxonomy is later used to elicit requirements from these two case studies in order to present a blueprint on adopting Design-Operation Continuum Engineering in any organization developing CPSs.
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8.
  • Jakobsen, Marianne U, et al. (författare)
  • Major types of dietary fat and risk of coronary heart disease : a pooled analysis of 11 cohort studies.
  • 2009
  • Ingår i: American Journal of Clinical Nutrition. - : Elsevier BV. - 0002-9165 .- 1938-3207. ; 89:5, s. 1425-1432
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: Saturated fatty acid (SFA) intake increases plasma LDL-cholesterol concentrations; therefore, intake should be reduced to prevent coronary heart disease (CHD). Lower habitual intakes of SFAs, however, require substitution of other macronutrients to maintain energy balance. OBJECTIVE: We investigated associations between energy intake from monounsaturated fatty acids (MUFAs), polyunsaturated fatty acids (PUFAs), and carbohydrates and risk of CHD while assessing the potential effect-modifying role of sex and age. Using substitution models, our aim was to clarify whether energy from unsaturated fatty acids or carbohydrates should replace energy from SFAs to prevent CHD. DESIGN: This was a follow-up study in which data from 11 American and European cohort studies were pooled. The outcome measure was incident CHD. RESULTS: During 4-10 y of follow-up, 5249 coronary events and 2155 coronary deaths occurred among 344,696 persons. For a 5% lower energy intake from SFAs and a concomitant higher energy intake from PUFAs, there was a significant inverse association between PUFAs and risk of coronary events (hazard ratio: 0.87; 95% CI: 0.77, 0.97); the hazard ratio for coronary deaths was 0.74 (95% CI: 0.61, 0.89). For a 5% lower energy intake from SFAs and a concomitant higher energy intake from carbohydrates, there was a modest significant direct association between carbohydrates and coronary events (hazard ratio: 1.07; 95% CI: 1.01, 1.14); the hazard ratio for coronary deaths was 0.96 (95% CI: 0.82, 1.13). MUFA intake was not associated with CHD. No effect modification by sex or age was found. CONCLUSION: The associations suggest that replacing SFAs with PUFAs rather than MUFAs or carbohydrates prevents CHD over a wide range of intakes.
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9.
  • Koziolek, H., et al. (författare)
  • Quality of service-oriented software systems (QUASOSS 2010)
  • 2011
  • Ingår i: Lecture Notes in Computer Science, vol 6627. - Berlin : Springer Berlin/Heidelberg. - 9783642212093 ; , s. 364-368
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
    • The 2nd International Workshop on the Quality of Service-Oriented Software Systems (QUASOSS 2010) brought together researchers and practitioners to assess current approaches for analyzing the quality of service-oriented software systems. Due to the current maturation of model-driven methods for service-oriented systems, the declared goal of QUASOSS 2010 was to assess the state-of-the-art, report on successful or unsuccessful application of these methods, and to identify a research roadmap for future approaches. QUASOSS 2010 was attended by 25 participants. It featured a keynote by Prof. Dorina Petriu, 6 paper presentations, and a panel discussion. © 2011 Springer-Verlag Berlin Heidelberg.
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