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See detailApplication Of The Hough Transform For Seed Row Localisation Using Machine Vision
Leemans, Vincent ULg; Destain, Marie-France ULg

in Biosystems Engineering (2006), 94(3),

This paper compares two methods based on machine vision to provide driver assistance in seed drill guidance in order to improve spacing accuracy during contiguous passages. The first case consisted of ... [more ▼]

This paper compares two methods based on machine vision to provide driver assistance in seed drill guidance in order to improve spacing accuracy during contiguous passages. The first case consisted of following the furrow created at the preceding passage by a special marker disc attached to the seed drill. A camera was located on the tractor and detected this furrow. In the second case, the seed rows themselves were detected by the camera without making use of the marker disc. In both cases, several video sequences were acquired in various situations, including different soil textures and various illumination conditions (375 sequences were acquired during three years). A pre-treatment of these sequences was performed and included a background subtraction in order to remove shadows and other wide unevenness. In the first case, the best results were obtained by using an image treatment based on the Hough transform coupled to a recursive filter. The search of the maximum of the Hough transform was performed using a mean shift algorithm. In the second case, where several parallel rows were simultaneously present on the images, an adapted Hough transform was proposed which took into account the a priori knowledge of the rows spacing. The trueness and precision in row detection were superior in the second case. The results are compatible with the application, since the trueness was smaller than 30 mm. This suggested that it can be possible to assist the manual guidance of a seed drill by an automatic system consisting in a camera detecting the seed rows. [less ▲]

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See detailApplication of the Hybrid Finite Element Mixing Cell method to an abandoned coalfield in Belgium
Wildemeersch, Samuel ULg; Brouyère, Serge ULg; Orban, Philippe ULg et al

in Journal of Hydrology (2010), 392(3-4), 188-200

The Hybrid Finite Element Mixing Cell (HFEMC) method is a flexible modelling technique particularly suited to mining problems. The principle of this method is to subdivide the modelled zone into several ... [more ▼]

The Hybrid Finite Element Mixing Cell (HFEMC) method is a flexible modelling technique particularly suited to mining problems. The principle of this method is to subdivide the modelled zone into several subdomains and to select a specific equation, ranging from the simple linear reservoir equation to the groundwater flow in porous media equation, to model groundwater flow in each subdomain. The model can be run in transient conditions, which makes it a useful tool for managing mine closure post-issues such as groundwater rebound and water inrushes. The application of the HFEMC method to an abandoned underground coal mine near the city of Liege (Belgium) is presented. The case study zone has been discretized taking advantage of the flexibility of the method. Then, the model has been calibrated in transient conditions based on both hydraulic head and water discharge rate observation and an uncertainty analysis has been performed. Finally, the calibrated model has been used to run several scenarios in order to assess the impacts of possible future phenomena on the hydraulic heads and the water discharge rates. Among others, the simulation of an intense rainfall event shows a quick and strong increase in hydraulic heads in some zones coupled with an increase in associated water discharge rates. This could lead to stability problems in local hill slopes. These predictions will help managing and predicting mine water problems in this complex mining system. [less ▲]

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See detailApplication of the laser beam deflection to the study of temperature filed and heat transfer in natural convection,
Cerisier, P.; Sylvain, J. D.; Dauby, Pierre ULg

in Experiments in Fluids (2002), 33

Detailed reference viewed: 10 (0 ULg)
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See detailApplication of the laser deflection to the study of temperature fields in two-dimensional flows
Cerisier, P.; Dauby, Pierre ULg

in Proceedings of the VI International science-technical conference, Optical methods of flows investigation (2001)

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See detailApplication of the Lempel-Ziv complexity to the alignment-free sequence comparison of protein families
Bacha, Sofiène; Baurain, Denis ULg

Scientific conference (2005, August 26)

Detailed reference viewed: 22 (4 ULg)
See detailApplication of the macromolecular engineering to the nanotechnology
Detrembleur, Christophe ULg

Conference (2005, May 11)

Detailed reference viewed: 9 (2 ULg)
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See detailApplication of the morphological acceleration factor in fluvial hydraulics
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in E-proceedings of the 36th IAHR World Congress (2015, June)

The morphological acceleration factor (Morfac) has been widely used to speed-up morphodynamic simulations, mostly in coastal applications. The value of Morfac was generally set by trial and error and ... [more ▼]

The morphological acceleration factor (Morfac) has been widely used to speed-up morphodynamic simulations, mostly in coastal applications. The value of Morfac was generally set by trial and error and little theoretical background is available to identify an optimal value of Morfac for a given application and a target level of accuracy. In the present research, we generalize the few previous theoretical analyses regarding two main aspects. First, the range of the considered parameters (Froude number, relative roughness, transport rate …) has been considerably extended to cover typical values characterizing fluvial applications and not only coastal settings. Second, we show that the optimal value of Morfac depends greatly on the specific mathematical formulation of the flow model and on the flow regime. [less ▲]

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See detailApplication of the new Eurocode 3 beam-column formulae to tubular construction
Ly, L; Jaspart, Jean-Pierre ULg; Weynand, K

Scientific conference (2010, December)

New design formulae for the stability of structural members subjected to combined bending moments and axial forces (so-called beam-columns) have been recently developed and included in the EN version of ... [more ▼]

New design formulae for the stability of structural members subjected to combined bending moments and axial forces (so-called beam-columns) have been recently developed and included in the EN version of the European Norm Eurocode 3 Part 1-1 (EC3). It has however to be recognized that these formulae have been validated mostly through comparisons with results of experimental tests and numerical simulations carried out on columns with open sections. The question may therefore be raised to know whether the new formulae are adapted to tubular columns with a similar degree of accuracy and safety than for open section columns. The aim of the paper is to indicate how present EC3 formulae fit with the available results on tubular columns, and then to suggest improvements of the formulae when applied to the latter. [less ▲]

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See detailThe application of the NSGA-II optimization method in designing control charts
Faraz, Alireza ULg; Heuchenne, Cédric ULg; Seif, Asghar

Conference (2014, June 04)

The problem of designing control chart is formulated as a multi-objective optimization problem with the adjusted average time to signal as the statistical objective and the expected cost per hour as the ... [more ▼]

The problem of designing control chart is formulated as a multi-objective optimization problem with the adjusted average time to signal as the statistical objective and the expected cost per hour as the economic objective. Then we try to find the Pareto-optimal designs in which the two objectives are minimized simultaneously by using the elitist non-dominated sorting genetic algorithm method. Through an illustrative example, the advantages of the proposed approach is shown by providing a list of viable optimal solutions and graphical representations, thereby bolding the advantage of flexibility and adaptability. [less ▲]

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See detailApplication Of The Quasi-Static Mode Of The Drop Volume Technique To The Determination Of Fundamental Surfactant Properties
Razafindralambo, Hary ULg; Blecker, Christophe ULg; Delhaye, Sylvie et al

in Journal of Colloid and Interface Science (1995), 174(2), 373-377

The quasi-static mode of the drop volume technique has been applied for determining the equilibrium surface tension-concentration (σe-c) curves of ionic (SDS, CTAB) zwitterionic (CHAPS), and nonionic ... [more ▼]

The quasi-static mode of the drop volume technique has been applied for determining the equilibrium surface tension-concentration (σe-c) curves of ionic (SDS, CTAB) zwitterionic (CHAPS), and nonionic (Triton X-100) surfactants. The experimental values have been fitted in two parts by the best polynomial and straight-line equations. Determination coefficients (R2) higher than 0.98 were achieved for all σe-c curves. The critical micelle concentration (CMC) and surface tension at the CMC have been calculated at the intersection point of the two fitted curves. The results conform with those found in the literature. The polynomial equation derivative at the CMC was used in the Gibbs equation to calculate the maximum surface excess concentration and the corresponding molecular area. The space required per molecule under saturation conditions is in agreement with the surfactant structures. A comparison with the Wilhelmy-plate method was also made. It is concluded that the quasi-static drop volume method provides accurate results and presents many practical advantages. [less ▲]

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See detailApplication of the restoring force surface method to a real-life spacecraft structure
Noël, Jean-Philippe ULg; Kerschen, Gaëtan ULg; Newerla, Alfred

in Proceedings of the International Modal Analysis Conference (IMAC) XXX (2012, January)

Many nonlinear system identification methods have been introduced in the technical literature during the last thirty years. However, few of these methods were applied to real-life structures. In this ... [more ▼]

Many nonlinear system identification methods have been introduced in the technical literature during the last thirty years. However, few of these methods were applied to real-life structures. In this context, the objective of the present paper is to demonstrate that the Restoring Force Surface (RFS) method can provide a reliable identification of a nonlinear spacecraft structure. The nonlinear component comprises an inertia wheel mounted on a support, the motion of which is constrained by eight elastomer plots and mechanical stops. Several adaptations to the RFS method are proposed, which include the elimination of kinematic constraints and the regularization of ill-conditioned inverse problems. The proposed methodology is demonstrated using numerical data. [less ▲]

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See detailApplication of the SAFIR Computer Program for Evaluating Fire Resistance
Kodur, Venkatesh; Nwosu, D.; Sultan, Mohamed et al

in Proc. Third Int. Conf. on Fire Research and Engineering (1999)

In this paper, the application of the computer program SAFIR to study the behaviour of a steel framed structure exposed to fire is illustrated. As a case study, a four storey framed structure is analysed ... [more ▼]

In this paper, the application of the computer program SAFIR to study the behaviour of a steel framed structure exposed to fire is illustrated. As a case study, a four storey framed structure is analysed under various fire scenarios. It is shown that the fire resistance is enhanced when the overall structural behaviour is considered, rather than the concept based on single elements. [less ▲]

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See detailApplication of the Stiffened Plate Method in Optimizing Hydraulic Structures
Rigo, Philippe ULg; NGuyen, Nhy jhuynh

in International Colloquium in Mechanics of Solids, Fluids, Structures and Interactions (2000, August)

Detailed reference viewed: 41 (2 ULg)
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See detailApplication of the TANK Model to a Tropical Monsoon Catchment in the Tonle Sap Lake Region of Cambodia
Someth, Paradis; Chanthy, Sochiva; Kubo, Naritaka et al

in Proceeding of The 4th AUN/Seed-Net Regional Conference on Geo-Disaster Mitigation in ASEAN (2011, October 25)

This paper presents an application of TANK Model to a sub-catchment of the Tonle Sap Lake of Cambodia. The TANK Model was developed in Japan and was reported as being successfully applied to many river ... [more ▼]

This paper presents an application of TANK Model to a sub-catchment of the Tonle Sap Lake of Cambodia. The TANK Model was developed in Japan and was reported as being successfully applied to many river basins in Africa, Asia, Europe and the United States. The objective of this study is to investigate the performance of the TANK Model in tropical monsoon climate condition. The studied area is a sub-catchment of the Tonle Sap Lake. Two automatic hydrological stations and four automatic telemetry meteorological stations were installed in the sub-catchment. Rating curves at the two hydrological stations was established. The performances of the rating curves and the TANK model were assessed by four standard statistical evaluations. The model was calibrated by discharge derived from the rating curves. The runoff pattern from the TANK Model correlated closely with rainfall pattern. The model could estimate runoff for the wet season, except for some peak flows generated from delayed runoffs. However, the model tended to overestimate dry season flow and react faster to rainfall events in the dry season. [less ▲]

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See detailApplication of the Wavelet Transform for GPS Cycle Slip Correction and Comparison with Kalman Filter
Collin, Fabienne; Warnant, René ULg

in Manuscripta Geodaetica (1995), 20

Detailed reference viewed: 364 (10 ULg)
See detailApplication of the Wavelet Transform for GPS Cycle Slip Detection and Comparison with Kalman Filter
Collin, Fabienne; Warnant, René ULg; Bruyninx, Carine

Conference (1993)

Detailed reference viewed: 60 (4 ULg)
See detailApplication of the Wavelet Transform for GPS Cycle Slip Detection and Comparison with Kalman Filter
Collin, Fabienne; Warnant, René ULg; Bruyninx, Carine

Conference (1993)

Detailed reference viewed: 49 (0 ULg)