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See detailDiscovery Tools, a Bibliography
Renaville, François ULg

Textual, factual or bibliographical database (2014)

Libraries are continually changing to meet the needs of users. This includes implementing discovery tools, also referred to as web-scale discovery tools or services, to make it easier to search through ... [more ▼]

Libraries are continually changing to meet the needs of users. This includes implementing discovery tools, also referred to as web-scale discovery tools or services, to make it easier to search through their physical, digital and electronic collections. Vendors and suppliers are continuously improving their functionali ties offering new services and improved technologies. Hundreds of publications and communications on implementation, comparison, user experience, information literacy, librarian perception, collection usage, etc. related to discovery tools have already been produced. This bibliography aims to give a selected overview of what (mostly) librarians have written or said about discovery tools. [less ▲]

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See detailDiscrépance et domaines de vie de l’ISQV-E(c) : quels liens avec le mal-être de l’enfant ?
Lemétayer, Fabienne; Lanfranchi, Jean-Baptiste; Missotten, Pierre ULg et al

in Revue Francophone de Clinique Comportementale et Cognitive (2012), XVII(1), 34-43

This study examines the processes and the life domains of the Child Quality of Life Systemic Inventory (ISQV-E(c) in French - Missotten, Etienne & Dupuis, 2007), involved in the suffering of depressed ... [more ▼]

This study examines the processes and the life domains of the Child Quality of Life Systemic Inventory (ISQV-E(c) in French - Missotten, Etienne & Dupuis, 2007), involved in the suffering of depressed children, assessed with the CDI. These questionnaires were administered to 453 to school age children (8-12 years old) and they all spoke French (273 French, 180 Belgian). An initial analysis was undertaken to verify the nature of the model, additive vs multiplicative, underlying the ISQV-E(c). Five factors were tested: the Goal, the Discrepancy (distance between State and Goal), Speed, Rank and the Gap. Regression analysis revealed that only the Goal and the Discrepancy are significantly related to suffering depression (additive model). From these two factors, a second analysis was performed to account for domains of life most involved in suffering from depression. The results dealt with a PLS path modeling helped to update the 10 domains of life, of the twenty-evaluated by the ISQV-E(c), likely to predict depressive suffering of children. The specific contribution of the ISQV-E(c) is discussed in relation to depressive affect assessed with the CDI. [less ▲]

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See detailDISCREPANCIES BETWEEN BIO-ANALYTICAL AND CHEMO-ANALYTICAL RESULTS HAVE A NON-NEGLIGIBLE MESSAGE
Goeyens, L.; Hoogenboom, R.; Eppe, Gauthier ULg et al

in Organohalogen Compounds (2010), 72

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See detailDiscrepancies between creatinine-based and cystatin C-based equations in estimating prevalence of stage 3 chronic kidney disease in an elderly population.
Delanaye, Pierre ULg; Cavalier, Etienne ULg; Saint-Remy, Annie ULg et al

in Scandinavian Journal of Clinical & Laboratory Investigation (2009), 69(3), 344-9

Background . The prevalence of stage 3 chronic kidney disease (CKD) is increasing, calculated using the modification of diet in renal disease (MDRD) study equation for estimating glomerular filtration ... [more ▼]

Background . The prevalence of stage 3 chronic kidney disease (CKD) is increasing, calculated using the modification of diet in renal disease (MDRD) study equation for estimating glomerular filtration rate (GFR). Cystatin C-based equations are also being used to estimate GFR. Using creatinine-based and cystatin C-based equations, the aim of our study was to measure the difference in prevalence of stage 3 CKD in a population. Methods . CKD screening is organized in the Province of Liege, Belgium. On a voluntary basis, people aged between 45 and 75 years are invited for screening. GFR is estimated using the MDRD study equation and by the three recent cystatin C-based equations proposed by Levey's group. The Levey 1 equation is based on cystatin C only and the Levey 2 equation on cystatin C corrected for age and sex. The Levey 3 equation combines cystatin C, creatinine, age and sex. Results . The population screened comprised 754 people. Cystatin C is highly correlated with creatinine (r = 0.6196, p<0.0001). Prevalence of stage 3 CKD when GFR is estimated by the MDRD equation study is 17.2 %, which is significantly and much higher than the prevalence obtained when cystatin C-based equations are used. Indeed, prevalence is 2 %, 3.3 % and 5.8 % with the Levey 1, 2 and 3 equations, respectively. Conclusions . The prevalence of stage 3 CKD varies strongly following the method used for estimating GFR, creatinine-based or cystatin C-based equations. Such discrepancies must be confirmed and explained in additional studies using GFR measured with a reference method. [less ▲]

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See detailDiscrepancy between prolactin (PRL) messenger ribonucleic acid and PRL content in rat fetal pituitary cells: possible role of dopamine
Hooghe-Peters, E. L.; Belayew, A.; Herregodts, P. et al

in Molecular Endocrinology (1988), 2(12), 1163-8

Data are controversial concerning the time when PRL-synthesizing cells are detected for the first time in the rat pituitary. Using a very sensitive immunocytochemical technique, we could visualize only a ... [more ▼]

Data are controversial concerning the time when PRL-synthesizing cells are detected for the first time in the rat pituitary. Using a very sensitive immunocytochemical technique, we could visualize only a few PRL cells before day 10 after birth. At that time, pituitary PRL was still 200 times less abundant than in the adult (on a tissue weight basis) whereas PRL mRNA per mg total RNA was only 80 times lower than in the adult. However, by in situ hybridization, we could demonstrate the presence of PRL mRNA in cells from fetal day 18 on. We have also followed the expression of GH gene in rat pituitary cells during development. In contrast to results obtained with PRL cells, quantitative analysis of cDNA probe hybridization to GH mRNA correlated well with measurements of immunostained cells. We found that PRL was released in the blood from fetal day 19 onwards. Thus, at that time PRL is synthesized and secreted but not stored. We therefore measured brain dopamine levels, and the data support the idea that the rise in dopamine levels after birth contributes to PRL storage. We confirmed in vitro that newborn pituitary cells can store PRL when cultured in the presence of dopamine. [less ▲]

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See detailDiscrepancy in hemoglobin A1c results obtained by HPLC and CE: influence of carbamyl HB
Gougnard, Th; Chapelle, Jean-Paul ULg; Charlier, Corinne ULg et al

Poster (1997, October 18)

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See detailA discrete competitive facility location model with variable attractiveness
Kucukaydin, Hande ULg; Aras, Necati; Altinel, I. Kuban

Conference (2009, July 08)

We consider the discrete version of the competitive facility location problem in which new facilities have to be located by a new market entrant to compete against already existing ones that may belong to ... [more ▼]

We consider the discrete version of the competitive facility location problem in which new facilities have to be located by a new market entrant to compete against already existing ones that may belong to one or more competitors. The objective of the firm is to determine the locations of the new facilities and their attractiveness levels to maximize the profit. We formulate a mixed-integer nonlinear programming model for this problem and propose three methods for its solution: a Lagrangean heuristic, two branch-and-bound methods using Lagrangean and nonlinear programming relaxations. [less ▲]

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See detailA discrete competitive facility location model with variable attractiveness
Kucukaydin, Hande ULg; Aras, Necati; Altinel, I. Kuban

in Journal of the Operational Research Society (2011), 62(9), 1726-1741

We consider the discrete version of the competitive facility location problem in which new facilities have to be located by a new market entrant firm to compete against already existing facilities that ... [more ▼]

We consider the discrete version of the competitive facility location problem in which new facilities have to be located by a new market entrant firm to compete against already existing facilities that may belong to one or more competitors. The demand is assumed to be aggregated at certain points in the plane and the new facilities can be located at predetermined candidate sites. We employ Huff’s gravity-based rule in modelling the behaviour of the customers where the probability that customers at a demand point patronize a certain facility is proportional to the facility attractiveness and inversely proportional to the distance between the facility site and demand point. The objective of the firm is to determine the locations of the new facilities and their attractiveness levels so as to maximize the profit, which is calculated as the revenue from the customers less the fixed cost of opening the facilities and variable cost of setting their attractiveness levels. We formulate a mixed-integer nonlinear programming model for this problem and propose three methods for its solution: a Lagrangean heuristic, a branch-and-bound method with Lagrangean relaxation, and another branch-and-bound method with nonlinear programming relaxation. Computational results obtained on a set of randomly generated instances show that the last method outperforms the others in terms of accuracy and efficiency and can provide an optimal solution in a reasonable amount of time. [less ▲]

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See detailDiscrete Element Method Modeling of Ball Mills - Liner Wear Evolution
Boemer, Dominik ULg

Master's dissertation (2015)

Ball mills, i.e. rotating cylindrical drums filled with a feed material and metal balls, also known as the charge, are a major category of grinding devices in mineral processing and cement production ... [more ▼]

Ball mills, i.e. rotating cylindrical drums filled with a feed material and metal balls, also known as the charge, are a major category of grinding devices in mineral processing and cement production. Since the grinding process is excessively energy-intensive and aggressive in terms of wear, a profiled and wear-resistant liner is installed in the mill to transfer energy to the grinding charge more efficiently and to protect the mill shell. Because of the harsh environment inside of the mill and the relatively long lifespan of its liner, the optimization of the liner by the classical way, i.e. experimental testing, is a difficult and slow process. In this thesis, a procedure for predicting the charge motion and the power draw of a ball mill based on the discrete element method (DEM) is calibrated and validated by means of photographs of the charge, and power draw measurements of a 1:5-scale laboratory mill, which were kindly provided by the company Magotteaux International S.A. . This computational method essentially renders future experimental testing unnecessary with respect to these characteristics. Based on this first method, a generic process for predicting the wear distribution and the progressive shape evolution of liner surfaces is developed and validated by the wear profiles of the shell liner in the first chamber of a 5.8 m diameter cement mill monitored during a decade by Magotteaux International S.A. . The energy dissipated by tangential damping defined by the linear spring-slider-damper DEM contact law was found to be the best fitting wear model with respect to the real wear data. The progressive update of the liner geometry by a multi-step procedure delivers relatively accurate results for liners without axial height variation while further investigations are still required for almost fully variable geometries. Nevertheless, detailed phenomena, like the creation of grooves in the liner, were for the first time numerically modeled in this thesis. [less ▲]

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See detailDiscrete Element Method Modeling of Ball Mills - Liner Wear Evolution
Boemer, Dominik ULg; Rycerski, Serge; Vis, Jean et al

in Oñate, E.; Bischoff, M.; Owen, D.R.J. (Eds.) et al Proceedings of the IV International Conference on Particle-Based Methods – Fundamentals and Applications (2015)

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See detailDiscrete element modelling approach to assessment of granular properties in concrete
Stroeven, Piet; He, Huan ULg; Stroeven, Martijn

in Journal of Zhejiang University. Science A (2011), 12(5), 335-344

This paper presents the technological relevance of a concurrent algorithm-based discrete element modelling (DEM) system, HADES. This new system is the successor of SPACE that is limited to spherical ... [more ▼]

This paper presents the technological relevance of a concurrent algorithm-based discrete element modelling (DEM) system, HADES. This new system is the successor of SPACE that is limited to spherical grains only. It can realistically simulate the packing of arbitrary-shaped particles up to the fully compacted state. Generation of families of such particles, i.e., generally representing aggregate of fluvial origin and crushed rock, respectively, and the forming way of particulate structure are described. Similarly shaped particles are proposed for simulation of cement paste because of conformity with experimental results obtained by the X-ray tomography method. Technologically relevant territories inside and outside concrete technology are presently explored in this efficient, reliable, and economic way. Some results obtained by this DEM approach are presented. [less ▲]

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See detailDiscrete Event Production Simulation and Optimisation of Ship Block Erection Process
Caprace, Jean-David ULg; Trevisani Da Silva, Clarice; Rigo, Philippe ULg et al

in Proceeding of the 10th International Conference on Computer Applications and Information Technology in the Maritime Industries (2011, May)

Nowadays, shipyards are making every effort to efficiently manage equipments and resources such as labourers, gantry cranes, transporters, steel and block stock yards, etc. The block erection scheduling ... [more ▼]

Nowadays, shipyards are making every effort to efficiently manage equipments and resources such as labourers, gantry cranes, transporters, steel and block stock yards, etc. The block erection scheduling of a gantry crane has thus far been manually performed by a manager of a shipyard. Such a scenario leads to undesirably long times for producing scheduling results. In addition, the quality of the scheduling results may not be optimal. To improve the overall process, block erection discrete event simulations have been developed in this study by using techniques of optimization. The first results presented in this paper are promising even if some future work must be realized. [less ▲]

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See detailDiscrete Event Production Simulation in Shipyard Workshops
Caprace, Jean-David ULg; Moreira Freire, Roberto; Assiss, Luiz Felipe et al

in Proceeding of the 21th COPINAVAL (2011, September)

Nowadays, shipyards are making huge effort to efficiently manage equipments and resources such as laborers, gantry cranes, transporters, steel and block stock yards, etc. Previously scheduling was ... [more ▼]

Nowadays, shipyards are making huge effort to efficiently manage equipments and resources such as laborers, gantry cranes, transporters, steel and block stock yards, etc. Previously scheduling was manually performed by an experienced manager of a shipyard. But such a scenario leads to undesirably long times for producing scheduling results. In addition, the quality of the scheduling results was usually not optimal. To improve the overall process, Discrete Event Simulations (DES) have been developed and recently use in shipbuilding industry. The use of simulation-based design and virtual reality technologies leads to higher efficiency in terms of work strategy planning, and offers, as a result, significant productivity gains. It gives computer-supported answers to the major questions: when and where to produce what and with which resources depending on the availability and restrictions of resources and materials. The first part of the paper presents a multi-criteria analysis to select the most appropriate DES software for shipyards. Then, the second part of the paper shows production simulation model focusing on block erection stage. Two different blocks splitting are compared and then the results are discussed. [less ▲]

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See detailDiscrete finite element characterizations of source fields for volume and boundary constraints in electromagnetic problems
Henneron, Thomas; Clénet, Stéphane; Dular, Patrick ULg et al

in Journal of Computational & Applied Mathematics (2008), 215(2), 438-447

The consideration of electromagnetic field sources in potential formulations necessitates the definition of source fields. Such source fields are first defined for both volume and boundary constraints in ... [more ▼]

The consideration of electromagnetic field sources in potential formulations necessitates the definition of source fields. Such source fields are first defined for both volume and boundary constraints in static electromagnetic models. Then, automatic procedures are proposed to conveniently and efficiently characterize discrete source fields, with regard to their use in finite element formulations, their supports, their direct expression requiring no pre-computation, and their associated constraints. Two application examples are proposed to illustrate the approach. [less ▲]

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See detailDiscrete Harmonic Oscillator: A Short Compendium of Formulas
Antippa, Adel F.; Dubois, Daniel ULg

in Dubois, Daniel (Ed.) COMPUTING ANTICIPATORY SYSTEMS (2010)

Since 2002, we have, in seven papers, studied the problem of the discrete harmonic oscillator, analytically, numerically, and graphically, and made progress on a number of fronts. We identified the ... [more ▼]

Since 2002, we have, in seven papers, studied the problem of the discrete harmonic oscillator, analytically, numerically, and graphically, and made progress on a number of fronts. We identified the natural frequency of oscillation of the dual incursive oscillators, studied the system bifurcation generated by incursive discretization, and the frequency dependent correlation between the resulting incursive oscillators. We also studied the synchronization of the discretizing time interval with the frequency of oscillation. From this analysis there emerged a nonlinear (or more precisely bilinear) formalism that is perfectly stable at all time scales, and fully conserves the total energy of the system. The formalism is applicable to the discrete harmonic oscillator specifically, and to discrete Hamiltonian systems in general. In retrospect the important themes and crucial steps can more easily be identified, and this is the purpose of this short note. In it we give, in a unified notation, a short compendium of the key formulas. This summary can serve as a guide for navigating through the seven papers, as well as a practical concise manual for using the formalism. [less ▲]

Detailed reference viewed: 29 (1 ULg)