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See detailPerformance evaluation of MPC for Waste Heat Recovery applications using organic Rankine cycle systems
Hernandez Naranjo, Jairo Andrés ULg

in hernandez, Andres (Ed.) Latin American control conference 2016, Medellin, Colombia, 13-15 October 2016 (2016, October 13)

Organic Rankine Cycle (ORC) technology has demonstrated to be a suitable tool for recovering waste heat at low temperatures. The fluctuating nature of the waste heat source (varying temperature and mass ... [more ▼]

Organic Rankine Cycle (ORC) technology has demonstrated to be a suitable tool for recovering waste heat at low temperatures. The fluctuating nature of the waste heat source (varying temperature and mass flow) makes of waste heat recovery applications a challenging task. In this contribution Model Predictive Control (MPC) and more classical PID-like controllers are investigated, where special attention is paid to the analysis of the control performance for heat source profiles coming from different applications. A dynamic model of a real regenerative ORC unit equipped with a single screw expander developed in the Modelica language is used to test and compare the PID and MPC based control strategies. Results show that for low amplitude variations PID and MPC can perform equally good, but in case of large variations MPC is a more effective control strategy as it allows a safer and more efficient operation, operating close to the boundary conditions where production is maximized. [less ▲]

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See detailHalf a century of Space Adventure at Centre Spatial of Liège
Rochus, Pierre ULg

Conference (2016, October 12)

Created by the University of Liège, the Centre spatial de Liège is a research centre dedicated to space instrumentation including environmental test facilities and high level laboratories. It works for ... [more ▼]

Created by the University of Liège, the Centre spatial de Liège is a research centre dedicated to space instrumentation including environmental test facilities and high level laboratories. It works for the European Space Agency (ESA), for the space industry and for regionals firms. From the beginning of its more than 50 years long history, CSL develops, assembles, calibrates and/or tests observation instruments and relevant sub-systems capable to operate in a harsh environment, in order to serve the demands of the space science. Space Systems Program focuses its effort to incorporate CSL into the teams dedicated for definition, design, integration and/or ground and in flight calibration of scientific payload missions, mainly under the final authority of the most prestigious Space Agencies (ESA, NASA, JAXA …). Today, more than 15 complex pieces of CSL technology have been launched in space, all of them operating nominally. Some of the most significant instruments made by CSL are: EIT solar telescope (SOHO), HI (STEREO), SWAP (PROBA 2), optical monitors with OM (Newton), OMC (INTEGRAL) and various contributions on PACS (Herschel), MIRI (JWST), UVS (JUNO) and COROT. In 2011, this strong heritage allows CSL to be awarded with the Extreme UV Imager (EUI) PIship of Solar Orbiter (ESA M1 science mission). For the Future, CSL is involved in the L1 JUICE, L2 ATHENA, M1 Solar Orbiter, M2 EUCLID, M3 PLATO, M4, S1 CHEOPS, S2 SMILE ESA missions as well as the SPP, ICON NASA Missions. The presentation will concentrate on the development of Space Instruments during this half a century of Space Adventure, focusing on Solar Physics and Space Weather Instruments. [less ▲]

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See detailPARTNERSHIP with a glass wool producer for accurate LCA
Gerbinet, Saïcha ULg; Briard, Vincent; Pigeolet, Jean-Pierre et al

Conference (2016, October 08)

This presentation aims to illustrate how a partnership with the private sector can progressively become a win-win collaboration. Taking into account the environmental aspects in the building sector has ... [more ▼]

This presentation aims to illustrate how a partnership with the private sector can progressively become a win-win collaboration. Taking into account the environmental aspects in the building sector has become unavoidable. Knauf Insulation, a glass wool producer, has started to evaluate the environmental impacts of it manufacturing processes for drafting Environmental Product Declarations (EPD). This first objective was mainly intended to respond to a market demand for EPDs of their products. Our first contact with Knauf Insulation was for drawing up EPDs of 10 of their products. This first work has shown the need for a more flexible tool to allow rapid life cycle analyze of a product and publication of an EPD, and thus respond quickly to market demands. The need of a better understanding of the environmental impact of the process is also underline to allow to follow the evolution of the impact and to reduce it. All the glass wool products are manufactured in a similar way, only a few parameters, such as density or thickness, are modified in the process to produce a given product. We have therefore chosen to develop a generic model that can be used for all glass wool products produced by Knauf Insulation, in any of their plants. The LCA model was developed in GaBi, and thanks to a positive collaboration with Thinkstep, the software editor, and Knauf Insulation, the model is finetuned for the production plants. Knauf Insulation can use this model for EPDs as well as for Ecoconception. The model is built to be user-friendly: the user sets the product characteristics and dimensions, and in which plant (or combination of plants) it is produced. The data collection is performed by Knauf Insulation with our support. When new data are available, the model is easily updated. Therefore the model is easy to use, easy to update and accurate. Thanks to this positive experience the collaboration is ongoing. The same modelling aspects have been adapted to another insulation product from Knauf Insulation, stone wool. Furthermore, Knauf Insulation has developed a new binder for its products called ECOSE and produced from renewable materials (biomass), and is formaldehyde-free. The previous LCA underline the need of a better characterization of ECOSE in a LCA perspective. Therefore, a PhD is underway to evaluate the impacts of this binder and its applications (glass wool products) as well as its future applications. This story underlines how the partnership between the university and private sector is a win-win situation, staring from EPD and leading to much needed fundamental research, more accurate EPDs and better awareness of the environmental impacts in general, when the private sector is convinced with the interest of the demarche. [less ▲]

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See detailVariations sur le moi: Mach, Musil, Hofmannsthal
Zincq, Aurélien ULg

Conference (2016, October 07)

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See detailEnvironmental impact of glucose: influence of the datasets choice on LCA results
Gerbinet, Saïcha ULg; Belboom, Sandra ULg; Léonard, Angélique ULg

Conference (2016, October 06)

The aim of this study is to have a good understanding of the environmental impact of glucose production. Glucose is generally produced from corn or wheat. Since agricultural processes are known to be ... [more ▼]

The aim of this study is to have a good understanding of the environmental impact of glucose production. Glucose is generally produced from corn or wheat. Since agricultural processes are known to be difficult to evaluate by LCA, the results obtained with two different LCA databases, Gabi and Ecoinvent, are compared in this work. The production of glucose from raw materials can be divided in two steps: the agricultural steps allowing the plant production, and the conversion step including the extraction of the starch from the plant and its hydrolysis into glucose. Preliminary results underline the high impact of the agricultural step, so a special attention has been paid to these data. Specific Belgian data collected by the Walloon Agricultural Research Centre (CRA-W) (2014) [1] have been used as primary data (yield, amount of fertilizers, etc.), either using Ecoinvent or GaBi datasets background data to model fertilizers, diesel consumption, etc. A third model was built using only data available in Ecoinvent for corn and wheat cultures. For the conversion steps, literature data have been used along with some industrial data. As few studies are available in the literature concerning starch hydrolysis, the focus has been placed on data validation (mass balance checks, cross-reference information, etc.). Based on these multiple sources, it is possible to compare the LCA results for the production of 1 kg of glucose for three different cases, summarized in the following table. The results obtained using these three models will be presented, at both the inventory and the impact assessment steps. They show significant differences and highlight the need to understand in depth the involved assumptions when developing the datasets, in addition to the ones adopted for the inventory. [less ▲]

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See detailStockage intersaisonnier d’énergie
Léonard, Grégoire ULg

Conference given outside the academic context (2016)

Detailed reference viewed: 7 (1 ULg)
See detailVizieR Online Data Catalog: Planet candidates discovered using K2's 1st yr (Crossfield+, 2016)
Crossfield, I. J. M.; Ciardi, D. R.; Petigura, E. A. et al

in Planet candidates discovered using K2's 1st yr (Crossfield+, 2016) (2016)

We select our FGK stellar sample from the all-sky Transiting Exoplanet Survey Satellite (TESS) Dwarf Catalog (TDC; Stassun et al. 2014, arXiv:1410.6379). We extract time-series photometry from the target ... [more ▼]

We select our FGK stellar sample from the all-sky Transiting Exoplanet Survey Satellite (TESS) Dwarf Catalog (TDC; Stassun et al. 2014, arXiv:1410.6379). We extract time-series photometry from the target pixel files provided by the K2 project using circular, stationary, soft-edged apertures. See section 2 for further explanations. We obtained high-resolution optical spectra of 83 planet candidate hosts using the HIRES echelle spectrometer on the 10m Keck I telescope (R=55000). We obtained spectra of 27 candidate host stars using the Levy high-resolution optical spectrograph mounted at the Automated Planet Finder (APF; R~80000 or 100000). We obtained spectra of a small number of candidate stellar hosts using the FEROS fiber-fed echelle spectrograph at the 2.2m MPG telescope (R~48000). See section 3.1 for further details. We obtained high-resolution imaging (HRI) for 164 of our candidate systems. Our primary instrument for this work was NIRC2 at the 10m Keck II telescope, with which we observed 110 systems. As part of multi-semester program GN-2015B-LP-5 (PI Crossfield) at Gemini Observatory, we observed 40 systems with the NIRI camera in the K-band. We also observed 33 stars with PHARO/PALM-3000 at the 5m Hale Telescope and 14 systems with LMIRCam at LBT, all at the K-band. We observed 39 stars at visible wavelengths using the automated Robo-AO laser adaptive optics system at the Palomar 1.5m telescope. Through our Long-Term Gemini program we also acquired high-resolution speckle imaging of 32 systems in narrowband filters centered at 692 and 880nm using the DSSI camera at the Gemini North telescope. See section 3.3 for further explanations. (7 data files). [less ▲]

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See detailLes essais d'Elfriede Jelinek. Genre, relation, singularité
Neelsen, Sarah ULg

Book published by Honoré Champion (2016)

This thesis discusses the work of the Austrian writer Elfriede Jelinek (Nobel Prize for Literature 2004) from its margins, from a corpus of “short texts” written from the beginning of her career beside ... [more ▼]

This thesis discusses the work of the Austrian writer Elfriede Jelinek (Nobel Prize for Literature 2004) from its margins, from a corpus of “short texts” written from the beginning of her career beside her novels and plays. As occasional prose, these essays are grounded in a specific aesthetic paradigm, which this dissertation seeks to define by examining their original conditions of publication. This method brings to light that these are commissioned works, released on very different media formats than a book (journals, flyers, programs and the internet), which have their own mode of reception due to their volatility in space and time. The corpus is presented against the backdrop of Jelinek’s main work and its major turning-points. It is also set in the context of Austria’s post-1945 literature according to the author’s personal and professional network in order to reintegrate Jelinek in her generation. Three chapters are then dedicated to a detailed analysis of the texts. This thesis highlights the slow genesis of their main theme, the possibility of a feminine work of art. Then it studies three characteristics of their style - hollowing, paradox and liquidity. Lastly, it deals with the relation to the reader, conceived as jamming and interference, both allowing, at least for a time, to prolong the text’s meaning, as it otherwise tends to become more and more obscure. Relation and singularity are key notions of this thesis, considered as the main aesthetic and political issues of its corpus, being also part of the essayistic tradition, discussed through some canonical definitions (Lukács, Adorno, Barthes, Marielle Macé, Georg Stanitzek). [less ▲]

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See detailA simple method to predict methane emissions based on milk mid infrared spectra
Vanlierde, Amélie ULg; Dehareng, Frédéric; Froidmont, Eric et al

Poster (2016, October)

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See detailPSF sharpening & post focal sensing for the VORTEX coronagraph
Orban De Xivry, Gilles ULg; Jolivet, Aïssa ULg; Huby, Elsa ULg et al

Poster (2016, October)

Small angle coronagaphy, such as the vortex phase mask, is a key scientific driver for the coming generation of VLT-like instrument and for the future ELTs. It is appealing for the full scientific ... [more ▼]

Small angle coronagaphy, such as the vortex phase mask, is a key scientific driver for the coming generation of VLT-like instrument and for the future ELTs. It is appealing for the full scientific exploitation of ground-based telescopes for the detection and characterization of exoplanets and circumstellar discs. One key element to small angle coronagraphy is a precise low-order wavefront control to avoid any leak decreasing the contrast level and even possibly mimicking off-axis signal. In this contribution, we present our early on-going effort in using post- coronagraphic focal images to perform wavefront control with a vortex coron- agraph. First, I will present an empirical approach similar to PSF sharpening techniques, sometimes used in classical imaging to reduce NCPA aberrations, to post-coronagraphic images. Then, I will discuss an alternative based on the general weak-phase solution to retrieve the complex Efield in the Lyot plane using three images, and how we can use this to control the phase in the pupil plane. Finally, after presenting those two approaches and first simulations, I will discuss the possible implementation of such techniques on our bench, the vortex optical demonstrator for coronagraphic applications (VODCA). [less ▲]

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See detailKinshasa, les 19, 20 et 21 janvier 2015 Une révolte démocratique
Polet, François ULg

in Revue Tiers Monde (2016), 228

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See detailLa notion de disposition au traitement : un exemple original d’application du GLM dans le cadre de l’accompagnement psychologique d’un plan de restructuration industriel
Corneille, Serge ULg; Dubois, Luc

Conference (2016, October)

Comment le Good Lives Model a t il été appliqué dans le cadre d'un plan social industriel à ArcelorMittal Liège? Comment les intervenants se sont-ils adaptés aux besoins des usagers? Quelle est la ... [more ▼]

Comment le Good Lives Model a t il été appliqué dans le cadre d'un plan social industriel à ArcelorMittal Liège? Comment les intervenants se sont-ils adaptés aux besoins des usagers? Quelle est la responsabilité des intervenants dans la disposition au traitement des usagers? Comment faciliter l'accessibilité de l'intervention? [less ▲]

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See detailNovel innovative possibilities for the dairy industry opened by common format of FT-MIR instruments
Grelet, Clément ULg; Fernandez Pierna, Juan Antonio; Dardenne, Pierre et al

Poster (2016, October)

FT-MIR technology is worldwide used for fast and cost effective determination of major milk components. However, due to the different individual response of each instrument the potential of this ... [more ▼]

FT-MIR technology is worldwide used for fast and cost effective determination of major milk components. However, due to the different individual response of each instrument the potential of this technology is currently underexploited as new tools cannot be easily ported to other instruments. Recently a standardization method was developed in order to harmonize the spectral response format between instruments of different brands and models but also across time for each spectrometer. The method matches monthly the infrared response of all spectrometers on the response of a reference instrument, making all machines talking a common language. The objective is to allow the creation and the use of common, new and innovative concepts by pooling resources and sharing data. Using this method, new tools for analysis of milk quality and milk technological properties have been created and shared within the network, as fatty acids and minerals predictions or milk coagulation properties. New concepts requiring a common spectral format have been developed like the untargeted detection of milk contaminant and abnormal milk or the determination of milk geographic origin. Models in relation with the status of the dairy cow were also created and shared as to predict ketosis, negative energy balance or methane emissions. Therefore models can be developed at one place and deployed within the entire network, in which 90 instruments are currently monthly standardized. [less ▲]

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See detailCytology of reactional spleen may be misleading
Ramery, Eve ULg; Vangrinsven, Emilie ULg; Gommeren, Kris ULg et al

Poster (2016, October)

Detailed reference viewed: 11 (1 ULg)
See detailStudy of insulin aggregation by SEC and CGE
Demelenne, Alice ULg; Napp, Aurore ULg; Servais, Anne-Catherine ULg et al

Conference (2016, October)

Introduction: Insulin is a widely used antidiabetic drug, which regulates carbohydrate and fat metabolism of human body. This hormone is mostly formulated in hexamer by addition of zinc as an excipient ... [more ▼]

Introduction: Insulin is a widely used antidiabetic drug, which regulates carbohydrate and fat metabolism of human body. This hormone is mostly formulated in hexamer by addition of zinc as an excipient but only the monomeric form is active once dissociated in the bloodstream. Insulin is prone to unfold when submitted to denaturating factors as temperature, ionic strength, agitation and pH. An accumulation of unfolded proteins results in a high tendency to aggregate and form amyloid fibrils. A deposit of those fibrils in the subcutaneous tissue leads to a complication called “insulin-derived amyloidosis”. Moreover, during its production, insulin is often subjected to extreme conditions making lack of aggregates an important parameter to be controlled during its quality control. United States and European Pharmacopoeias use both size exclusion chromatography (SEC) to assess the level of covalent high molecular weight species. This technique is reproducible, and easy to use but shows many drawbacks including possible changes in the aggregates composition by dilution into the HPLC system or adsorption of sample onto the stationary phase. For those reasons other techniques have been considered in the literature for studying aggregation of insulin. Optical microscopy, electron microscopy, dynamic light scattering, turbidimetry, Fourier Transform infrared spectroscopy, Raman spectroscopy, thioflavin T fluorescence and circular dichroism spectroscopy are some of them. In any cases, the use of orthogonal techniques is essential to assess the relevance of the results. Results: In this study, insulin aggregates were generated after optimization of incubation conditions (pH, temperature, agitation…). Those aggregates were then analyzed by SEC and capillary electrophoresis (CE). CE shows many advantages in terms of sample and solvent consumption and enables analysis of samples under their native form. We showed that capillary gel electrophoresis (CGE) is a promising technique to analyze covalent aggregates of insulin due to the fact that it separates the aggregates according to their size and not to their size/charge ratio. The use of a laser-induced fluorescence detector was also found attractive to enhance the sensitivity of the method. [less ▲]

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See detailFondements théoriques du GLM et présentation d'un outil d'intervention inspiré du GLM
Corneille, Serge ULg; Henrard, Noémie ULg

Conference (2016, October)

L'objectif de cette communication sera de présenter les principes théoriques fondamentaux du GLM ainsi que de présenter brièvement un outil d'intervention clinique particulièrement exemplatif de la ... [more ▼]

L'objectif de cette communication sera de présenter les principes théoriques fondamentaux du GLM ainsi que de présenter brièvement un outil d'intervention clinique particulièrement exemplatif de la logique d'intervention spécifique du GLM: l'inventaire des souhaits et préoccupations personnels [less ▲]

Detailed reference viewed: 11 (1 ULg)