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See detailAnalysis of buildings height computed on a DSM generated from a VHR satellite stereopair
Binard, Marc ULiege; Devriendt, D.; Cornet, Yves ULiege et al

in Hostert, P.; Damm, A.; Schiefer, S. (Eds.) Proceedings of the First Workshop of the EARSeL Special Interest Group on Urban Remote Sensing "Challenges and Solutions" (2006)

At the final meeting of the SPIDER project, the users wanted to know if it was possible to evaluate the building height or the number of floors, from the DSM obtained from a VHR satellite stereopair ... [more ▼]

At the final meeting of the SPIDER project, the users wanted to know if it was possible to evaluate the building height or the number of floors, from the DSM obtained from a VHR satellite stereopair. Combined with the 2D delineation of the buildings – for example coming from the cadastre register - this information could be useful in urban studies – e.g. population density assessment - or to generate quasi realistic 3D views. In this example, the DSM is extracted from an IKONOS stereopair (DSMsat) on the hilly area of Liège in Belgium. It is used in combination with a 3D vector file. On the one hand, this file is used for the 2D delineation of the buildings. On the other hand, the third dimension provided by this file is also exploited for the assessment of the extracted building height. Moreover LIDAR data are also available over the test area, permitting the creation of a reference DSM (DSMref). * The first step of the process consists in the determination of the ground altitude around the buildings. A procedure was setup in order to compute it and to generate the DTM for the reference and satellite data (DTMref and DTMsat). * The second step consists in the extraction of statistics, for every building (min, max, mean, etc.) as well from the DSMsat and DSMref, as from the DTMsat and DTMref. The analysis shows that the satellite approach globally underestimates the building height of about 4 m. These results are discussed regarding building height versus the area and the heterogeneity of the roof height. [less ▲]

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See detailAnalysis of calcium-induced effects on the conformation of fengycin
Nasir, Mehmet Nail ULiege; Laurent, Pascal ULiege; Flore, Christelle ULiege et al

in Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy (2013), 110

A combination of CD, FT-IR, NMR and fluorescence spectroscopic techniques was applied to elucidate the conformation of fengycin, a natural lipopeptide with antifungal and eliciting activities, in a ... [more ▼]

A combination of CD, FT-IR, NMR and fluorescence spectroscopic techniques was applied to elucidate the conformation of fengycin, a natural lipopeptide with antifungal and eliciting activities, in a membrane-mimicking environment and to investigate the effect of calcium ions on the conformation. We mainly observed that fengycin adopts a turn conformation and that the side chain of glutamate residues plays a key role on the stabilization of the peptide ring backbone conformation. More particularly, the binding of calcium ions by the carboxylic moieties has a consequence on the environment of the tyrosine residues. Our data suggest also an arrangement of fengycin molecules into “-sheet like micelles” in a membrane-mimicking environment and the enhancement of this aggregating effect in presence of calcium ions. The modulation of the fengycin conformation by the environmental conditions may influence its biological properties. [less ▲]

Detailed reference viewed: 138 (57 ULiège)
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See detailAnalysis of candiate genes for prolificacy in two commercial sow populations
Buske, Bernd ULiege; Sternstein, Ina; Brockmann, Gudrun

Poster (2006)

Detailed reference viewed: 35 (1 ULiège)
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See detailAnalysis of canine and feline uroliths in the Benelux. A retrospective study 1994-2005
de Lovinfosse, T.; Detilleux, Johann ULiege; Picavet, P. et al

in Proceedings of the 9th Congress ESVCN (2005)

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See detailAnalysis of Canine and Feline uroliths in the Benelux. A retrospective study : 1994-2004
De Lovinfosse, Tanguy; Detilleux, Johann ULiege; Picavet, Philippe et al

Poster (2005, April)

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See detailAnalysis of carbon sequestration sensitivity to recent changes in land use patterns over Belgium using a combination of models and remote sensing techniques
Verma, Arpita ULiege; Jacquemin, Ingrid ULiege; Francois, Louis et al

Conference (2020, May 07)

Changes in land use/land cover (LU/LC) practices are critical to determine and this is one of the crucial driving forces of terrestrial ecosystem productivity and carbon sink variability. However ... [more ▼]

Changes in land use/land cover (LU/LC) practices are critical to determine and this is one of the crucial driving forces of terrestrial ecosystem productivity and carbon sink variability. However, relatively few studies have quantified the impact of LU/LC change on the terrestrial carbon cycle. In the present study, we developed a workflow for quantifying and assessing changes in terrestrial carbon stocks due to land use change using a dynamic vegetation model. The main objectives are to assess status and variation in carbon stocks across land covers, towards the quantification of spatial distribution and dynamic variation of terrestrial carbon sinks in response to LU/LCchange. Here, with the CARAIB dynamic vegetation model, we perform simulations using several sets of LU/LC data to analyse the sensitivity of the carbon sink. Here we propose a new method of using satellite – and machine learning-based observation to reconstruct historical LU/LC change and compare it with static data from the cadastral map and dynamic data from an agent-based model coupled with CARAIB. It will quantify the spatial and temporal variability of land use during the 2000-2019 period over Belgium at high resolution. This study will give the space to analyse past information and hence calibrate the dynamic vegetation model to minimize uncertainty in the future projection (until 2035). Overall, this study allows us to understand the effect of changing land use pattern and identify the input dataset, which minimizes the uncertainty in model estimation. [less ▲]

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See detailAnalysis of Chromosome Segregation, Histone Acetylation, and Spindle Morphology in Horse Oocytes
Franciosi, Federica; Tessario, Irene; Dalbies-Tran, Rozenn et al

in Journal of Visualized Experiments (2017), 123(e55242),

The field of assisted reproduction has been developed to treat infertility in women, companion animals, and endangered species. In the horse, assisted reproduction also allows for the production of ... [more ▼]

The field of assisted reproduction has been developed to treat infertility in women, companion animals, and endangered species. In the horse, assisted reproduction also allows for the production of embryos from high performers without interrupting their sports career and contributes to an increase in the number of foals from mares of high genetic value. The present manuscript describes the procedures used for collecting immature and mature oocytes from horse ovaries using ovum pick-up (OPU). These oocytes were then used to investigate the incidence of aneuploidy by adapting a protocol previously developed in mice. Specifically, the chromosomes and the centromeres of metaphase II (MII) oocytes were fluorescently labeled and counted on sequential focal plans after confocal laser microscope scanning. This analysis revealed a higher incidence in the aneuploidy rate when immature oocytes were collected from the follicles and matured in vitro compared to in vivo. Immunostaining for tubulin and the acetylated form of histone four at specific lysine residues also revealed differences in the morphology of the meiotic spindle and in the global pattern of histone acetylation. Finally, the expression of mRNAs coding for histone deacetylases (HDACs) and acetyl-transferases (HATs) was investigated by reverse transcription and quantitative-PCR (q-PCR). No differences in the relative expression of transcripts were observed between in vitro and in vivo matured oocytes. In agreement with a general silencing of the transcriptional activity during oocyte maturation, the analysis of the total transcript amount can only reveal mRNA stability or degradation. Therefore, these findings indicate that other translational and post-translational regulations might be affected. Overall, the present study describes an experimental approach to morphologically and biochemically characterize the horse oocyte, a cell type that is extremely challenging to study due to low sample availability. However, it can expand our knowledge on the reproductive biology and infertility in monovulatory species. [less ▲]

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See detailAnalysis of city size distribution in Ethiopia: Empirical evidence from 1984 to 2012
Ermias, Amha; Bogaert, Jan ULiege; Wogayehu, Fisseha

in Journal of Urban Management (2019)

Detailed reference viewed: 25 (6 ULiège)
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See detailAnalysis of climate change, high-flows and low-flows scenarios on the Meuse basin: WP1 report - Action 3
Drogue, G.; Fournier, M.; Bauwens, Alexandra ULiege et al

Report (2010)

Detailed reference viewed: 180 (57 ULiège)
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See detailAnalysis of climatic conditions of wildfires in Belgium with an automatic daily atmospheric circulation patterns classification
Erpicum, Michel ULiege; Fettweis, Xavier ULiege; Mabille, Georges ULiege

Conference (2008, October 02)

An automatic daily atmospheric circulation patterns classification was built using the geopotential heights of 850 hPa level from the ECMWF (re)analysis over the period 1958-2007. The classification is ... [more ▼]

An automatic daily atmospheric circulation patterns classification was built using the geopotential heights of 850 hPa level from the ECMWF (re)analysis over the period 1958-2007. The classification is based on a similarity index between two 850hPa geopotential maps centred on Belgium, taking into account the slope difference between both daily geopotential surfaces as well as the absolute geopotential difference between both surfaces. Wildfire occurrences are analysed in April and September together with monthly frequencies and persistences of daily atmospheric circulation patterns types as well as with monthly variability of weather climate conditions. [less ▲]

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See detail[Analysis of clusterin gene (CLU/APOJ) polymorphism in Alzheimer's disease patients and in normal cohorts from Russian populations].
Golenkina, S. A.; Gol'tsov, A. Iu; Kuznetsova, I. L. et al

in Molekuliarnaia Biologiia (2010), 44(4), 620-6

Three genes mutations in which cause familial forms of Alzheimer's disease are known to date:PSEN1, PSEN2 and APP; and APOE gene polymorphism is a strong risk factor for Alzheimer's disease. We have ... [more ▼]

Three genes mutations in which cause familial forms of Alzheimer's disease are known to date:PSEN1, PSEN2 and APP; and APOE gene polymorphism is a strong risk factor for Alzheimer's disease. We have evaluated allele and genotype frequency distribution of rs11136000 polymorphism in clusterin (CLU) gene (or apolipoprotein J, APOJ) in populations of three Russian regions and i nAlzheimhner's diseasepatients. Genome-wideassociation studies in samples from several European populations have recently revealed highly significant association o fCLU gene with AD (p = 8.5 x 10(-10)). We found no differences in allele and genotype frequencies of rs11136000 between populations from Moscow, Ural and Siberia regions. The allele frequencies are close to those in European populations. The genetic association analysis in cohort of Alzheimer's disease patients and normal individuals (>500 individuals ineach group) revealed no significant association of the rs11136000 polymorphism in CLU with Alzheimer's disease in Russian populations. Although our resultsdo not confirm the role of CLU gene as a majorgenetic factor forcommon form of Alzheimer's disease, the data do not rule out the possibility of modest effect of CLU and interaction between CLU and APOE genotypes in etiology of Alzheimer's disease. [less ▲]

Detailed reference viewed: 41 (1 ULiège)
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See detailAnalysis of Code Procedures for Seismic Assessment of Existing Buildings: Italian Seismic Code, EC8, ATC-40, FEMA356, FEMA440
Mihaylov, Boyan ULiege

Master of advanced studies dissertation (2006)

It is widely recognized that ground shaking may induce unacceptable levels of damage in existing buildings located in seismic regions. This vulnerability has been attributed to several reasons, such as ... [more ▼]

It is widely recognized that ground shaking may induce unacceptable levels of damage in existing buildings located in seismic regions. This vulnerability has been attributed to several reasons, such as insufficient strength and stiffness, poor detailing, irregularities in plan and elevation, domination of brittle failure modes over ductile ones, etc. On account of that, seismic assessment of existing buildings is adopted as a problem which needs specific treatment in building codes. The present study analyzes five codes for assessment of existing buildings: the Italian seismic code, EC8, FEMA356, ATC-40 and FEMA440. The analysis of each code is performed within a common theoretical frame. The code assumptions and simplifications are pointed out together with their possible inconsistencies and weaknesses. Comparisons between the different procedures are performed as well. The most important outcomes stress insufficiencies in the analysis procedures as well as in the criteria for choice of model dimension and analysis type, consideration of dynamic P-Δ effects, in non-linear modeling, shear resistance evaluation, and application of force-based procedures. [less ▲]

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See detailAnalysis of coding sequences for tissue inhibitor of metalloproteinases 1 (TIMP1) and 2 (TIMP2) in patients with aneurysms.
Wang, Xingjun ULiege; Tromp, G.; Cole, C. W. et al

in Matrix Biology (1999), 18(2), 121-4

Aneurysms are characterized by dilation, i.e. expansion and thinning of all the arterial wall layers, which is accompanied by remodeling of the connective tissue. Genes involved in the regulation of ... [more ▼]

Aneurysms are characterized by dilation, i.e. expansion and thinning of all the arterial wall layers, which is accompanied by remodeling of the connective tissue. Genes involved in the regulation of tissue remodeling are therefore candidate genes. We analyzed TIMP1 and TIMP2 coding sequences in 12 individuals with abdominal aortic aneurysms (AAA), one individual with AAA and intracranial aneurysms (IA), four individuals with IA and two clinically unaffected individuals. We identified two nucleotide variants in both the TIMP1 and the TIMP2 coding sequences. All differences occurred in the third base positions of codons and were neutral polymorphisms. A significant difference was observed in the frequency of TIMP2 nt 573 polymorphism between 168 alleles from AAA patients and 102 control alleles. [less ▲]

Detailed reference viewed: 33 (1 ULiège)
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See detailAnalysis of collagen preservation in bones recovered in archaeological contexts using NIR Hyperspectral Imaging
Vincke, Damien; Miller, Rebecca ULiege; Stassart, Edith ULiege et al

in Talanta (2014), 125

The scope of this article is to propose an innovative method based on Near Infrared Hyperspectral Chemical Imaging (NIR-HCI) to rapidly and non-destructively evaluate the relative degree of collagen ... [more ▼]

The scope of this article is to propose an innovative method based on Near Infrared Hyperspectral Chemical Imaging (NIR-HCI) to rapidly and non-destructively evaluate the relative degree of collagen preservation in bones recovered from archaeological contexts. This preliminary study has allowed the evaluation of the potential of the method using bone samples from the Early Upper Palaeolithic, Mesolithic and Neolithic periods at the site of Trou Al'Wesse in Belgium. NIR-HCI, combined with chemometric tools, has identified specific spectral bands characteristic of collagen. A chemometric model has been built using Partial Least Squares Discriminant Analysis (PLS-DA) to identify bones with and without collagen. This enables the evaluation of the degree of collagen preservation and homogeneity in bones within and between different strata, which has direct implications for archaeological applications (e.g., taphonomic analyses, assemblage integrity) and sample selection for sub- sequent analyses requiring collagen. Two archaeological applications are presented: comparison between sub-layers in an Early Upper Palaeolithic unit, and evaluation of the range of variability in collagen preservation within a single Holocene stratum. [less ▲]

Detailed reference viewed: 67 (9 ULiège)
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See detailAnalysis of continental palynomorphs from the Llandovery in Saudi Arabia
Steemans, Philippe ULiege; Higgs, K. T.; Wellman, C. H.

Conference (2000)

Detailed reference viewed: 17 (0 ULiège)
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See detailAnalysis of Control-Generator-Structure Interactions in Wind Turbines using an Integrated Simulation Approach
Bruls, Olivier ULiege; Cugnon, Frédéric; Defourny, Michel et al

in Proceedings of Multibody Dynamics ECCOMAS Conference (2011, July)

This paper addresses the modelling of the interactions between the generator, the controller and the structural components in wind turbines. Those interactions have a direct influence on the mechanical ... [more ▼]

This paper addresses the modelling of the interactions between the generator, the controller and the structural components in wind turbines. Those interactions have a direct influence on the mechanical loads, which need to be evaluated for the design of the machine. Using the sofware Samcef For Wind Turbines, a model is developed which includes a description of the aeroelastic behaviour of the blades, the gearbox dynamics, the tower flexibility, as well as the electrical and control parts. Electrical and control subsystems can be modelled either by linking an external DLL, by a co-simulation approach or by using an integrated and monolithic model. This paper shows that the monolithic approach can be exploited for the reliable analysis of electrical-control-structure interactions in wind turbines. Non-mechanical elements are represented in a modular way using a newly developed library of block diagram elements. The coupled equations of motion are established by numerical assembly and they include a finite element description of the mechanical components and a block diagram description of the generator and its control system. A fully implicit, stable and reliable solver is then exploited to solve the coupled equations of motion. Simulation results are presented for a 2 MW wind turbine with a doubly-fed induction generator and they illustrate the coupling between the power control system and the dynamic structural response. [less ▲]

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See detailAnalysis of crosswind aerodynamics for competitive handcycling
Mannion, Paul; Toparlar, Yasin; Blocken, Bert et al

in Journal of Wind Engineering and Industrial Aerodynamics (2018), 180

Competitive hand-cycling represents a unique case for cycling aerodynamics as the athletes are in a relatively aerodynamic position in comparison to traditional able-bodied cyclists. There are some ... [more ▼]

Competitive hand-cycling represents a unique case for cycling aerodynamics as the athletes are in a relatively aerodynamic position in comparison to traditional able-bodied cyclists. There are some aerodynamic similarities between both cycling disciplines, including wheel designs and helmets. The lack of research in hand-cycling aerodynamics presents the potential for significant improvements. This research analysed the aerodynamics of competitive hand-cycling under crosswind conditions using wind-tunnel experiments and Computational Fluid Dynamics (CFD) simulations. A range of yaw angles from 0° to 20° in 5° increments were investigated for two separate hand-cycling setups; a road race and a time-trial setup. A maximum drag increase of 14.1% was found from 0° to 15° yaw, for a hand-cyclist equipped for a road race. The three disk wheels used for the TT setup had a large impact on the lateral forces experienced by the TT hand-cyclist. At just 5° yaw and at 15 m/s, the drag and lateral forces for the TT setup matched closely, while this event did not occur until 15° yaw at the same velocity for the road setup. For 20° yaw, the ratio of the lateral force to drag force was 1.6 and 5.6 for the road and TT setups respectively. [less ▲]

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See detailThe analysis of crude and purified locust bean gum: A comparison of samples from different carob tree populations in Tunisia
Bouzouita, Nabiha; Khaldi, A.; Zgoulli, S. et al

in Food Chemistry (2007), 101(4), 1508-1515

The crude and purified locust bean gum (LBG) from seven areas of the north and centre of Tunisia (Bouarada, Bargou, Kessra, Haffouz, Borj Toumi, Ben Arous and INRGREF) were analyzed for moisture, ash ... [more ▼]

The crude and purified locust bean gum (LBG) from seven areas of the north and centre of Tunisia (Bouarada, Bargou, Kessra, Haffouz, Borj Toumi, Ben Arous and INRGREF) were analyzed for moisture, ash, protein, acid-insoluble matter and mannose/galactose ratio. The purified samples exhibited higher mannose/galactose ratios and lower amounts of ash, protein and acid-insoluble matter than the crude gum. The purified LBG from different regions had 3.43-6.99% moisture, 0.87-2.06% ash, 0.61-2.46% protein, 0.00-1.20% acid-insoluble matter and 3.55-4.32 mannose/galactose ratios. Statistical analysis revealed that purification significantly affected (P < 0.05) moisture, ash, protein, insoluble matter contents and mannose/galactose ratios of the crude LBG and purified LBG for all samples from different areas. The rheological properties of the different carob gum samples were determined, the best rheological properties are those of spontaneous carob trees of Bargou, Bouarada and Kessra areas. The climatic and geographic origin of carob and the cultivation mode influence the chemical and rheological properties. The purification of crude galactomannan samples by precipitation with isopropanol gave a clear and more stable solution, due to the elimination of impurities and endogenous enzymes. (c) 2006 Elsevier Ltd. All rights reserved. [less ▲]

Detailed reference viewed: 238 (8 ULiège)