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See detailNew developments in artificially layered ferroelectric oxide superlattices
Dawber, Matthew; Bousquet, Eric ULg

in MRS Bulletin (2013), 38

Artifi cially layered superlattices of oxide materials have been intensely investigated for some time, but continue to reveal new potential as a route to advanced functional materials. As well as ... [more ▼]

Artifi cially layered superlattices of oxide materials have been intensely investigated for some time, but continue to reveal new potential as a route to advanced functional materials. As well as considering electrostatics and strain, a more complete picture of the interfaces in these systems also needs to incorporate the possibility of additional structural distortions, electronic redistributions, and complex polarization domain structures. Here we focus on superlattices composed of two perovskite oxide materials, where one is a ferroelectric, and discuss the important interactions between the component materials that determine the behavior of the new artifi cial material. We discuss interfaces both with and without electronic screening. The fi rst class of interface contains technologically relevant ultrathin ferroelectric capacitors and the more recently studied ferroelectric-metal superlattices. In these systems, the infl uence of the ferroelectric polarization decreases rapidly with distance from the interface. By contrast, in systems where the materials adjacent to the ferroelectric layers are dielectrics, the polarization of the ferroelectric layer infl uences the properties of the adjacent layers over a much longer distance, setting the stage for fascinating competition between the properties of the combined materials. [less ▲]

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See detailNew developments in behavioral research : theory, method and application (compte-rendu)
Richelle, Marc ULg

in Behavioral Processes (1981), 6(2), 203-204

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See detailNew developments in Belgian childcare policy and practice
Vandenbroeck, M.; Pirard, Florence ULg; Peeters, J.

in European Early Childhood Education Research Journal (2009), 17(3), 408-416

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See detailNew developments in benzopyran derivatives as pancreatic β-cell KATP channel openers
Florence, X.; De Tullio, Pascal ULg; Lebrun, P. et al

Poster (2006, November 18)

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See detailNew developments in electrografting of thin polymer films
Jérôme, Christine ULg

Conference (2006, June)

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See detailNew Developments in Handling Stress Constraints in Optimal Material Distributions
Duysinx, Pierre ULg; Sigmund, Ole

in Proceedings of 7th AIAA/USAF/NASA/ISSMO symposium on Multidisciplinary Design Optimization (1998)

There is a general interest to consider stress constraints in topology optimization of continuum structures. By their very nature stress constraints are local constraints which result in large scale ... [more ▼]

There is a general interest to consider stress constraints in topology optimization of continuum structures. By their very nature stress constraints are local constraints which result in large scale optimization problems that are often expensive to solve. Here in order to reduce the computing the effort we explore an alternative technique based on equivalent global (that is integrated) constraints. We define two global stress constraints based on the p-norm and p-mean of the epsilon-relaxed overall stress criteria in the finite elements. We present a new formulation of the epsilon-relaxation technique which is better suited to topology optimization of continuum structures and which makes the relaxation process automatic. The "p-mean" and "p-norm" functions bound by lower and upper value the maximum value of the epsilon-relaxed overall stress criterion. Based on numerical experiments this study compares the global and the local constraint formulations. Even if the use of integrated constraints leads a reduction of the computing time by one or two orders of magnitude, they definitely give a weaker control of local stress level. This sometimes can lead to solutions that are a bit different. [less ▲]

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See detailNew developments in medical imaging applied to Neurosurgery
Martin, Didier ULg

Scientific conference (2010, January 20)

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See detailNew developments in quantitative analysis and trace analysis in pharmaceutical matrices by FTIR
Otte, Xavier; Duvivier, France; Evrard, Brigitte ULg et al

in Proceedings de la journée de rencontre des jeunes chimistes mars 1998 (1998)

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See detailNew developments in SAFIR 2013 - New concrete models
Gernay, Thomas ULg

Scientific conference (2012, November 29)

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See detailNew developments in the application of automatic learning to power system control
Wehenkel, Louis ULg; Glavic, Mevludin; Ernst, Damien ULg

in Proceedings of the 15th Power System Computation Conference (PSCC 2005) (2005)

In this paper we present the basic principles of supervised learning and reinforcement learning as two complementary frameworks to design control laws or decision policies within the context of power ... [more ▼]

In this paper we present the basic principles of supervised learning and reinforcement learning as two complementary frameworks to design control laws or decision policies within the context of power system control. We also review recent developments in the realm of automatic learning methods and discuss their applicability to power system decision and control problems. Simulation results illustrating the potentials of the recently introduced fitted Q iteration learning algorithm in controlling a TCSC device aimed to damp electro-mechanical oscillations in a synthetic 4-machine system, are included in the paper. [less ▲]

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See detailNew developments in the functionalization of aliphatic polyesters by "click" copper-catalyzed azide-alkyne cycloaddition
Lecomte, Philippe ULg; Riva, Raphaël ULg; Schmeits, Stephanie ULg et al

Conference (2009, June 03)

Nowadays, biodegradable and biocompatible aliphatic polyesters are widely used as environmentally friendly thermoplastics and biomaterials. Nevertheless, the absence of any pendant functional group is a ... [more ▼]

Nowadays, biodegradable and biocompatible aliphatic polyesters are widely used as environmentally friendly thermoplastics and biomaterials. Nevertheless, the absence of any pendant functional group is a severe limitation for the development of novel applications. Our strategy aiming at functionalizing aliphatic polyesters relies on the “click” copper-catalyzed cycloaddition (CuAAC) of alkynes duly substituted by functional groups or even chains onto PCL bearing pendant azides. The aliphatic polyesters bearing pendant azides have been very efficiently synthesized by a straightforward approach, which relies on the ring-opening copolymerization of αClεCL (or γBrεCL) and εCL (or lactide) followed by reaction with sodium azide to convert pendant chlorides or bromides into azides. The alternative reported by Emrick et al. is based on the CuAAC reaction of azides substituted by any functional group onto copolyesters of poly(ε-caprolactone) bearing pendant alkynes. Interestingly enough, Emrick et al. carried out the CuAAc reaction in water at 80°C. Unfortunately, it turned out, at least in our hands, that these conditions can not be extended to the derivatization of more sensitive aliphatic polyesters because degradation was then unavoidable. Nevertheless, we found out that degradation can be minimized whenever the CuAAC reaction is carried out in an organic solvent at lower temperature. Typically, the CuAAC reaction was carried out in DMF or THF at 35°C. Recently, it was shown that supercritical carbon dioxide can be used as a more environmentally friendly solvent than DMF or THF. The contamination by catalytic residues of aliphatic polyesters functionalized by the CuAAC reaction is a severe limitation in view of future applications, especially in the biomedical field. In the last part of this talk, a special attention will be paid on our current efforts to get rid of copper residues. [less ▲]

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See detailNew developments in the management of osteoporosis.
Reginster, Jean-Yves ULg

in Climacteric : The Journal of the International Menopause Society (2008), 11(S2), 30

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See detailNew developments in the synthesis of aliphatic polyesters by ring-opening polymerisation
Jérôme, Robert ULg; Lecomte, Philippe ULg

in Smith, R. (Ed.) Biodegradable polymers for polymer industrial applications (2005)

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See detailNew developments on the macromolecular engineering of ring-shaped aliphatic polyesters
Lecomte, Philippe ULg; Li, Haiying; Jérôme, Robert ULg

Scientific conference (2008, May 30)

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See detailNew developments on the ring opening polymerisation of polylactide
Jacobsen, Sven; Fritz, Hans-Gerhard; Degée, Philippe et al

in Industrial Crops & Products (2000), 11

Polylactides (PLA), biodegradable aliphatic polyesters, produced solely from renewable resources may substitute petrochemically based polymers in a broad range of applications in the near future, if we ... [more ▼]

Polylactides (PLA), biodegradable aliphatic polyesters, produced solely from renewable resources may substitute petrochemically based polymers in a broad range of applications in the near future, if we manage to produce them at lower cost and higher efficiency as nowadays. Possible applications include food packaging for meat and soft drinks, films for agro-industry and non-wovens in hygienic products. The authors developed, based on a new catalytic system, a reactive extrusion polymerisation process, which can be used to produce PLA continuously in larger quantities and at lower costs than before. This extrusion polymerisation process has been developed and tested with laboratory scale machines and the possibilities to extend this polymerisation process to lactide based blockcopolymers have been investigated. [less ▲]

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See detailNew developments on thromboxane and prostacyclin modulators. Part I: thromboxane modulators
Dogné, Jean-Michel ULg; De leval, X.; Hanson, Julien ULg et al

in Current Medicinal Chemistry (2004), 11

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See detailNew developments on thromboxane and prostacyclin modulators. Part II: prostacyclin modulators
De Leval, X.; Hanson, Julien ULg; David, Jean-Louis ULg et al

in Current Medicinal Chemistry (2004), 11

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See detailNew developments on thromboxane modulators
Dogné, Jean-Michel ULg; Hanson, Julien ULg; De leval, X. et al

in Mini Reviews in Medicinal Chemistry (2004)

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See detailA new Devonian flora in Argentina: palaeobotanical and stratigraphic implications
Prestianni, C.; Rustan, J. J.; Vaccan, N. E. et al

Conference (2012)

Detailed reference viewed: 24 (4 ULg)