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Peer Reviewed
See detailInvestigation of soil degradation by means of an opto-electronic microreliefmeter
Destain, Marie-France ULg; Descornet, G.; Roisin, C. et al

in Soil & Tillage Research (1989), 13(3), 299-315

To investigate the behaviour of seedbeds as affected by climatic stresses, under the dependance of different systems of organic improvements, an opto-elctronic device was used, presenting a high ... [more ▼]

To investigate the behaviour of seedbeds as affected by climatic stresses, under the dependance of different systems of organic improvements, an opto-elctronic device was used, presenting a high resolution capacity and good rapidity. The contactless measurements ditrectly recorded in a computer have been repeated at different times exactly at the same place in the field. A complete statistical analysis by means of spectrum analysis gave accurate information about the behaviour of clods of different size. The differentiated evolution of the soil surface according to climatic stresses (frost and rainfall) was noted. The influence of organic and/or mineral improveemnts appeared clearly too. [less ▲]

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See detailInvestigation of sol-gel yttrium doped ZnO thin films: structural and optical properties
Ivanova, T; Harizanova, A; Koutzarova, T et al

in Journal of Physics: Conference Series (2016)

Nanostructured metal oxide films are extensively studied due to their numerous applications such as optoelectronic devices, sensors. In this work, we report the Y–Zn–O nanostructured films prepared by sol ... [more ▼]

Nanostructured metal oxide films are extensively studied due to their numerous applications such as optoelectronic devices, sensors. In this work, we report the Y–Zn–O nanostructured films prepared by sol-gel technology from sols with different concentration of yttrium precursor, followed by post-annealing treatment. The Y doped ZnO thin films have been deposited on Si and quartz substrates by spin coating method, then treated at températures ranging from 300-800°C. XRD analysis reveals modification of the film structure and phases in the doped ZnO films. [less ▲]

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See detailInvestigation of spectral impacts on the performance of a concentration device using a Fresnel lens combined with a double junction cell
Loicq, Jerôme ULg; Galante, Nicolas ULg; Thibert, Tanguy ULg et al

in Proceedings of SPIE (2014, May 15)

This experimental study was carried out within the context of high concentration photovoltaics. The paper presents the results of an experimental investigation relating to the quantification of the ... [more ▼]

This experimental study was carried out within the context of high concentration photovoltaics. The paper presents the results of an experimental investigation relating to the quantification of the impacts of the chromatic effect on the performance of a double junction GaInP/GaAs solar cell. Chromatic effects are the result of material dispersion caused by the refractive optics component. This study aims to evaluate the effect of the spectral modification of the incident beam on the whole solar concentrator system performance. Such considerations are fundamental in producing a highly accurate design, with which to achieve the best possible system performance. Efficiency is evaluated within the vicinity of the focus of a Fresnel lens designed for concentration. On the optical axis, rays with different wavelengths are not focalized at the same points. The spectral content of the beam depends, therefore, upon the position of the cell along the optical axis. It is assumed that spectral content modification may have an impact on cell performance and, as a consequence, on system efficiency as a whole. Efficiency of the optical Fresnel lens and of the cell were evaluated in relation to spectral content modification. [less ▲]

Detailed reference viewed: 55 (22 ULg)
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See detailAn investigation of structural dimension variation in electrostatically-coupled MEMS resonator pairs using mode-localization
Wood, Graham; Chun, Zhao; Pu, Suan et al

in IEEE Sensors Journal (2016)

If a pair of MEMS resonators are electrostatically coupled together, the vibration amplitude ratios at the resonant frequencies of the resulting coupled system are sensitive to stiffness perturbation. An ... [more ▼]

If a pair of MEMS resonators are electrostatically coupled together, the vibration amplitude ratios at the resonant frequencies of the resulting coupled system are sensitive to stiffness perturbation. An imbalance between the two resonators causes the confinement of vibration energy when the system is resonating, an effect known as mode-localization. The degree of localization can be determined by extracting the amplitude ratio of the resonators through capacitive transduction. In this paper, we have fabricated MEMS devices, using a dicing-free silicon-on-insulator process, consisting of pairs of closely spaced microresonators. Each resonator consists of a clamped-clamped beam with a wider section in the middle, which is the location of the electrostatic coupling, instituted through the DC biasing of the resonators. Several devices have been fabricated, with the length of the anchor beams being varied, which influences the frequency of resonance. Stiffness imbalance between the resonators has been introduced through electrostatic spring softening, with the sensitivity of the amplitude ratio of the resonant mode shape being greater for the higher frequency, shorter anchor devices. The sensitivities of the devices in this study have been found to be 9 times greater than state-of-the-art two-degree-of-freedom mode-localized sensors. [less ▲]

Detailed reference viewed: 27 (3 ULg)
See detailInvestigation of Structure-Fundamental/Functional Property Relationships of (Bio)-surfactants for a Rational Design of their Preparation and Use in Food and Non-food applications
Razafindralambo, Hary ULg

Conference (2012, May 01)

(Bio)-surfactants are among the most versatile compounds in our planet, either in nature or in biological systems, as well as in manufactured products. Increasing knowledge on the relationships between ... [more ▼]

(Bio)-surfactants are among the most versatile compounds in our planet, either in nature or in biological systems, as well as in manufactured products. Increasing knowledge on the relationships between their structure, fundamental properties, and functionalities in simple, and thereafter in more complicated models, are therefore the key factor on their rational preparation and use for any applications. In the present communication, the effect of different structural entities of (bio)surfactants, especially Carbohydrate-based amphiphilic compounds, including monomeric, oligomeric, and polymeric surfactants, on their interfacial properties at short time (under dynamic conditions) and long time (at the equibrium), and the impact of such fundamental properties through physico-chemical parameters on the formation and stability of colloidal systems (micelles, foams, emulsions) will be presented. Some perspectives in their applications will be discussed. [less ▲]

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See detailInvestigation of sudden death of calves after epileptic seizures due to hypomagnesaemia and hyperparathyroidism
Chevalier, Marine ULg; Lebreton, Pascal; Garnier, Catherine et al

in Revista Portuguesa de Buiatria (2012, June), (Special Edition),

Detailed reference viewed: 64 (8 ULg)
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See detailInvestigation of the Adaptability of Transient Stability Assessment Methods to Real-Time Operation
Weckesser, Johannes ULg; Jóhannsson, Hjörtur; Sommer, Stefan et al

in IEEE PES Innovative Smart Grid Technologies Conference Europe (2012)

In this paper, an investigation of the adaptability of available transient stability assessment methods to real-time operation and their real-time performance is carried out. Two approaches based on ... [more ▼]

In this paper, an investigation of the adaptability of available transient stability assessment methods to real-time operation and their real-time performance is carried out. Two approaches based on Lyapunov’s method and the equal area criterion are analyzed. The results allow to determine the runtime of each method with respect to the number of inputs. Furthermore, it allows to identify, which method is preferable in case of changes in the power system such as the integration of distributed power resources (DER). A comparison of the performance of the analyzed methods leads to the suggestion that matrix reduction and time domain simulation are the most critical operations. [less ▲]

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See detailInvestigation of the added mass method for seismic design of lock gates
Buldgen, Loïc ULg; Le Sourne, Hervé; Caprace, Jean-David ULg et al

in Engineering Structures (2017)

Detailed reference viewed: 23 (4 ULg)
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See detailInvestigation of the best suture pattern to close a stuffed Christmas turkey
Verwilghen, Denis ULg; Busoni, Valeria ULg; Van Galen, Gaby ULg et al

in Veterinary Record : Journal of the British Veterinary Association (2011), 169(26), 685-686

Detailed reference viewed: 82 (10 ULg)
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See detailInvestigation of the Biological Activity and the Environmental Impact of Tunisian MSW Landfills
Mhiri, F.; Marouani, L.; Benzarti, A. et al

in Christensen; Cossu; Stegmann (Eds.) Proceedings Sardinia 03, Ninth International Waste Management and Landfill Symposium (2003)

This paper presents the results of the investigation of the biological activity that takes place in three municipal solid waste landfills (MSW landfills) situated in different regions of two dry climate ... [more ▼]

This paper presents the results of the investigation of the biological activity that takes place in three municipal solid waste landfills (MSW landfills) situated in different regions of two dry climate in Tunisia. Since the climatic water balance is negative (potential evapotranspiration being 1.5 to 5 times higher than rainfall), it has often been considered that this kind of landfill has neither environmental impact nor efficient biological activity. However, the three landfills revealed a biological activity with biogas often containing more than 60 percent of methane. Indeed, the upper waste layer that was effectively dry (dry weight from 85 to 98%), the core of refuse contained between 35 and 65% of dry matter. In some boreholes, the produced gases periodically expelled leachates like small geysers. Therefore, the results assess that landfill management in countries with dry climate should be considered with adapted technologies, not necessary the same as under temperate or humid climates. [less ▲]

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See detailInvestigation of the biological activity in MSW landfills under dry climates (Tunisia and Haiti)
Hiligsmann, Serge ULg; Lardinois, Mathias; Rodriguez, Christian et al

in Christensen; Cossu; Stegmann (Eds.) Proceedings Sardinia 01, Eight International Waste Management and Landfill Symposium (2001)

This paper presents the results of the investigation of the biological activity that takes place in four municipal solid waste landfills situated in different regions of two dry climate countries i.e ... [more ▼]

This paper presents the results of the investigation of the biological activity that takes place in four municipal solid waste landfills situated in different regions of two dry climate countries i.e. Haiti and Tunisia. Since the climatic water balance is negative (potential evapotranspiration being 1.5 to 5 times higher than rainfall), it has often been considered that this kind of landfill has neither environmental impact nor efficient biological activity. However, the four landfills revealed a biological activity with biogas often containing more than 60 percent of methane. Indeed, under the upper waste layer that was effectively dry (dry weight from 85 to 98 %), the core of refuse contained between 35 and 65 % of dry matter. In some boreholes, the produced gases periodically expelled leachates like small geysers. Therefore, the results assess that landfill management in countries with dry climate should be considered with adapted technologies, not necessary the same as under temperate or humid climates [less ▲]

Detailed reference viewed: 77 (15 ULg)
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See detailInvestigation of the biological activity in MSW landfills under dry climates (Tunisia and Haiti)
Hiligsmann, Serge ULg; Lardinois, M.; Rodriguez, C. et al

in Kocasoy, G.; Atabarut, T.; Nuhoglu, I. (Eds.) Appropriate environmental and solid waste management and technologies for developing countries (2002)

This paper presents the results of the investigations carried out over two years (April 2000 – February 2002) to quantify the biological activity that develops in four municipal solid waste landfills ... [more ▼]

This paper presents the results of the investigations carried out over two years (April 2000 – February 2002) to quantify the biological activity that develops in four municipal solid waste landfills located in different regions of two dry climate countries i.e. Haiti and Tunisia. Since the climatic water balance is negative (potential evapotranspiration being 1.5 to 5 times higher than rainfall), it has often been considered that this kind of landfill has neither environmental impact nor efficient biological activity. However, after five campaigns of sampling and analysis at different seasons, the results of the investigations show a relatively stable biological activity in the four landfills with biogas often containing more than 60 percent of methane. Indeed, under the upper waste layer that was effectively dry (dry weight from 85 to 98 %), the core of refuse contained between 35 and 65 % of dry matter. In some boreholes, the produced gases periodically expelled leachates like small geysers. Therefore, the results assert that landfill management in countries with dry climate should be considered with adapted technologies, not necessary the same as under temperate or humid climates. [less ▲]

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See detailInvestigation of the capabilities of a new parallel pressurized liquid extraction (PLE) system for dioxins and PCBs in biological samples
Focant, Jean-François ULg; Cash, T. P.; Turner, W. E. et al

in Organohalogen Compounds (2007), 69

Detailed reference viewed: 17 (1 ULg)
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See detailInvestigation of the cathodic electropolymerization of acrylonitrile, ethylacrylate and methylmethacrylate by coupled quartz crystal microbalance analysis and cyclic voltammetry
Baute, Noëlle; Martinot, Lucien; Jérôme, Robert ULg

in Journal of Electroanalytical Chemistry (1999), 472(1), 83-90

The cathodic electropolymerization of acrylonitrile (AN), ethylacrylate (EA) and methylmethacrylate (MMA), has been monitored for the first time by coupled electrochemical quartz crystal microbalance (QCM ... [more ▼]

The cathodic electropolymerization of acrylonitrile (AN), ethylacrylate (EA) and methylmethacrylate (MMA), has been monitored for the first time by coupled electrochemical quartz crystal microbalance (QCM) and cyclic voltammetry analyses. These data have been compared to the previously published analyses for methacrylonitrile (MAN). At the potential Ep1 of the less cathodic of the two voltammetric peaks observed (peak I), the polymer formed is anchored firmly to the cathode even in a good solvent for it, and it remains adsorbed when the voltammetric scan is repeated up to Ep1. In parallel, a linear relationship is observed between the frequency change recorded in situ by the QCM up to Ep1 and the PAN film thickness measured ex-situ by ellipsometry. However, when potentials more negative than peak I are scanned, the polymer desorption (degrafting) occurs as assessed by solubilization in a good solvent. Polymerization is also resumed but in solution and no longer as grafted chains. The major difference between the acrylic monomers (AN and EA) and the methacrylic ones (MMA and MAN) is that part of the methacrylic chains are not grafted at Ep1. This coexistence of adsorbed and desorbed chains is not observed for the polyacrylic chains in that potential range. The mass of PAN deposited onto the cathode has been approximated from the film thickness and the Sauerbrey equation, so allowing the Mn of the grafted chains to be estimated. [less ▲]

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See detailInvestigation of the coagulation system in canine idiopathic pulmonary fibrosis
Roels, Elodie ULg; Bauer, N.; Lecut, Ch. et al

Poster (2016, September)

Detailed reference viewed: 20 (2 ULg)
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See detailInvestigation of the consistency of the recent CH4 increase derived from NDACC-FTIR, ACE-FTS and GEOS-Chem
Bader, Whitney ULg; Conway, Stephanie; Strong, Kim et al

Conference (2015, May 21)

We present an update on the status of the recent methane increase study based on six FTIR ground-based sites, ACE-FTS satellite occultations and GEOS-Chem simulation.

Detailed reference viewed: 67 (9 ULg)
See detailInvestigation of the copolymerization behavior of a cyclic carbonate with vinyl acetate using CMRP
Scholten, Philip ULg; Demarteau, Jérémy ULg; Debuigne, Antoine ULg et al

Poster (2017, March)

Ethylene is an unconjugated monomer difficult to copolymerise in a controlled fashion using common radical or coordination-insertion polymerisation. Cobalt-mediated radical polymerisation (CMRP) provides ... [more ▼]

Ethylene is an unconjugated monomer difficult to copolymerise in a controlled fashion using common radical or coordination-insertion polymerisation. Cobalt-mediated radical polymerisation (CMRP) provides a powerful means to radically copolymerise ethylene in a controlled fashion under mild conditions.[1][2] In addition, different copolymer structures, such as block or alternating, can be accessed. ACO2-based cyclic carbonate was chosen as a promising comonomer but conflicting reports on the copolymer structure have been reported.[3][4] To better understand the copolymerisation behaviour of this monomer, model copolymerisations with vinyl acetate were performed and are reported below with the aim of gaining insights into the copolymersiation behaviour, which will allow us to better tackle ethylene copolymerisations. [less ▲]

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See detailInvestigation of the death of calves after epileptiform seizures associated with metabolic disorders
Chevalier, Marine; Lebreton, Pascal; Garnier, Catherine et al

in Cattle Practice (2014), 22(1), 10-16

Death of calves after epileptiform seizures can be caused by metabolic disorders including hypomagnesaemia, although a range of other conditions may also be implicated and therefore also warrant ... [more ▼]

Death of calves after epileptiform seizures can be caused by metabolic disorders including hypomagnesaemia, although a range of other conditions may also be implicated and therefore also warrant investigation. Hypomagnesaemia is primarily observed in herds where calves are fed exclusively with either milk or milk substitute products. Hyperparathyroidism is associated with congestion and hypertrophy of the parathyroid gland and causes both hypercalcaemia and hypophosphataemia. However, its exact aetiology currently remains unclear. The purpose of this study was to explain epileptiform seizures in calves from a cattle herd presenting both deaths and decreased average daily gain (ADG). A Montbeliard herd with calves presenting epileptiform seizures from the age of five weeks was studied. The herd consisted of 39 cows and 46 calves. Tachycardia, nervousness and trampling, violent seizures of tetany lasting approximately 15 minutes were all observed, while opisthotonos was observed in 5 calves. Three of the latter calves died. The remaining calves presented a decreased ADG. Blood and urine biochemical assays were performed on 8 sick calves to determine the aetiology of the clinical signs. The assays revealed normo/hyper-calcaemia, hypophosphataemia and hypomagnesaemia, as well as hypocalciuria, hyperphosphaturia and hypomagnesuria. Deficiencies in iodine, iron and vitamins A, D3 and E were also reported in the herd. These calves could potentially be suffering from hyperparathyroidism. Hyperparathyroidism results in hypomagnesaemia, hypovitaminosis-A and, on occassion, hypercalcaemia and hypophosphataemia. This condition can lead to seizures, muscular problems, heart attacks and anorexia. The simultaneous occurrence of hypomagnesaemia, hyperparathyroidism and hypovitaminosis-A has been never described in related research literature. This is, therefore, in all likelihood a new metabolic disorder facing young cattle. Blood and urine biochemical assays are important tools for the detection of this pathological entity in calves. A dosage of parathyroid hormone (PTH) by the enzyme-linked immunosorbent assay (EIA) method using a kit suitable for cattle can be used to detect hyperparathyroidism. [less ▲]

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See detailInvestigation of the determinants of the mental knowledge of public parking facilities
Cools, Mario ULg; van der Waerden, Peter; Janssens, Davy

in Proceedings of the 13th World Conference on Transport Research (2013)

This paper presents a study regarding the determinants of travellers’ mental knowledge of public parking facilities. The data regarding the mental knowledge were collected in the city of Hasselt, Belgium ... [more ▼]

This paper presents a study regarding the determinants of travellers’ mental knowledge of public parking facilities. The data regarding the mental knowledge were collected in the city of Hasselt, Belgium, by means of an internet-based questionnaire. In total 1007 respondents completed the questionnaire. Two different dependent variables were specified: the mental representation of parking facilities (known or not) and the identification of parking facilities (identified first or not). In addition, three different groups of determinants were included in the models: parking attributes, personal characteristics, and mental knowledge of the city. The data are analyzed using generalized estimating equations (GEE) models for binary data. The analyses show a considerable influence of the following parking attributes: type of parking facility, Park & Ride status, charged parking, number of places, and location of parking facility. Furthermore our study revealed that personal characteristics and mental knowledge of the city play a marginal role. [less ▲]

Detailed reference viewed: 50 (4 ULg)