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See detailLa investigación pedagógica
de Landsheere, Gilbert ULiege; Mialaret, Gaston

Book published by Angel Estrada - 1ère éd. (1971)

La complejidad que alcanzan los problemas educativos, en todos sus niveles y modalidades, exige una labor de investigacion apoyada en solidos principios metodologicos y cientificos. : En este volumen se ... [more ▼]

La complejidad que alcanzan los problemas educativos, en todos sus niveles y modalidades, exige una labor de investigacion apoyada en solidos principios metodologicos y cientificos. : En este volumen se describen y analizan esos principios y se explican las técnicas y procedimientos que, en la actuaUdalj, .pueden utilizarse con mayor grado de confiabilidad en esa esfera. No esa eswfera. Nos es muy abundante la bibliografia en lengua espanola sobre un asunto tan importante, y por eso la obra aqui presentada tiene una significacion muy particular: representa un aporte fundamental para los estudios de la pedagogia en un nivei superior, para todos los especialistas y técnicos en planificàcion escolar y para los docentes que, en el ambito mas reducido -pero no menos trascendente-- del aula y de la escuela quieren llevar a cabo tareas de investigacion con él objeto de perfeccionar la tarea cotidiana. - Prefacio : La educacion es y seguira siendo un arte. Afirmaci6n ésta que no esta en contradicci6n con la siguiente: cierto sector de la pedagogia se torna cada vez mas cientifico. En la actualidad sabemos muy bien que no hay arte que pueda ejercerse correctamente ni que le permita al artista expresarse ,plenamente, si no torna como referencia un minimo de datos objetivos, si de algun modo no aplica los resultados de laboratorio, s'i no se apoya en ciertos supuestos cientificos. Al respecto, es harto elocuente el arte del clinico: lQUé seria del médico que, no queriendo fiarse mas que de su intuici6n, se resistiera a hacer practicar examenes de laboratorio o no se valiera de placas radiograticas para fundar su diagnostico y prescribir la terapia correspondiente? . Lo mismo sucede en el dominio de la educaci6n. La personalidad del maestro es uno de los elementos esenciales del hecho educativo, y desde hace tiempo se viene insistiendo en que "no se enseiia lo que se sabe o IQ que se cree saber; se ensena lo que es". Por grandes que sean la perspicacia y la intuici6n que pueda tener un hombre -si bien estas dotes son siempre indispensables- con eso solo no alcanza. Al educador le es imprescindible poseer conocimientos biologicos, sociologicos y psicologicos, y aprender a observar a sus alumnos, a controlar' las tareas de éstos, a considerar objetivamente los resultados que se logran. No tenemos ya el derecho, en los tiempos que corren, de retacear los esfuerzos que le permitan a la escuela cumplir su misi6n lo me)or posible y alcanzar el mas alto grado de rendimiento. En este terreno es indispensable adoptar una actitud cientifica, de modo que quien aspire a dedicarse a la pedagogia experimental debe disponer de instrumentos capaces de permitirle !legar a conclusiones objetivas. Toda vez Que en lengua francesa no abundan las publicaciones sobre la materia, se hace necesario recurrir a publicaciones anglosajonas donde encontrar las referencias y estudios indispensables. Excepcion 'hecha de unos pocos manuales dedicados a la experimentacion pedagogica, nunca se encuentran juntos los conceptos generales relativos a toda investigacion y los medios que permiten llevarla a buen término: preparacion del pian experimental, tests que se utilizan, transcripcion y aprovechamiento de los resultados. Al sefior De Landsheere se le debe el mérito de haber realizado tal agrupamiento y de haber ordenado los datos dispersos en multitud de obras diferentes. Ademas, ha tornado en cuenta los trabajos mas recientes y los mas modernos métodos, de modo que proporciona, tanto al educador como al investigador, una nutrida informacion técnica referente al campo de la pedagogia experimental. En adelante ya se podra recomendar un . manual a todos aquellos que perciban el canflcter fecundo de la actividad cientifica, y las estudiantes habrim de ver con mayor claridad lo fértil e interesante que es esto que auri muchos toman por manias propias de especialistas. Merced al libro del sefior De Landsheere resulta viable emprender un aprendizaje paulatino, de suerte que es de confiar en que la cantidad cada vez mayor de maestros interesados en estos nuevos aspectos le permita a la educacion realizar mas rapidos adelantos. El libro del sefior De Landsheere es clara y accesible para cualquier lector, de modo que hasta el no iniciado especialmente en las técn icas cientificas puede acudir a él sin inccnvenientes; porque en sintesis, es la obra de un investigador que es educador a la vez. En momentos en que la investigacion pedagogica esta tornando auge en todo e~ mundo, en los paises de habla francesa era necesaria una obra de este caracter que permitiese uniformar los métodos y las técnicas de trabajo. Y esta lagu- na es la que el sefior De Landsheere se ha animado a llenar. Nuestro agradecimiento y parab1enes por la Importante contribucion que, de este modo, pone a disposicion ? Todos cuantos se preocupan por el pervenir de la educacion. Gaston Mialaret [less ▲]

Detailed reference viewed: 242 (6 ULiège)
See detailInvestigación y Desarrollo más Innovación
Artige, Lionel ULiege; Nicolini, Rosella

Book published by Consejo Económico y Social de España (2008)

Detailed reference viewed: 35 (5 ULiège)
Peer Reviewed
See detailInvestigaciones sobre el aceite de Mauritia flexuosa L.
Lognay, Georges ULiege; Trevejo, E.; Jordan, E. et al

in Grasas Y Aceites (1987), 38(5), 303-307

Detailed reference viewed: 98 (0 ULiège)
Peer Reviewed
See detailInvestigating a bottom-up approach for extracting domain ontologies from urban databases
Chaidron, Christophe; Teller, Jacques ULiege; Billen, Roland ULiege

in Proceedings of the 1st Workshop of COST Action C21 Towntology (2006)

Detailed reference viewed: 37 (5 ULiège)
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See detailInvestigating a Bottom-up Approach for Extracting Ontologies from Urban Databases
Chaidron, Christophe; Billen, Roland ULiege; Teller, Jacques ULiege

in Teller, Jacques; Lee, John; Roussey, Catherine (Eds.) Ontologies for Urban Development (2007)

Detailed reference viewed: 54 (10 ULiège)
See detailInvestigating a two-level dynamic estimation algorithm for large-scale electric power systems
Rousseaux, Patricia ULiege; Van Cutsem, Thierry ULiege; Ribbens-Pavella, Mania

in Proceedings of the 1st European Workshop on the Real Time Control of Large Scale Systems (1984)

Detailed reference viewed: 15 (0 ULiège)
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See detailInvestigating apical adverse effects of four endocrine active substances in the freshwater gastropod Lymnaea stagnalis
Giusti, Arnaud ULiege; Lagadic, Laurent; Barsi, Alpar et al

in Science of the Total Environment (2014), 493

The hermaphroditic gastropod Lymnaea stagnalis is proposed as a candidate species for the development of OECD guidelines for testing of the reprotoxicity of chemicals, including endocrine active ... [more ▼]

The hermaphroditic gastropod Lymnaea stagnalis is proposed as a candidate species for the development of OECD guidelines for testing of the reprotoxicity of chemicals, including endocrine active substances (EASs). Up to now, only a few putative EASs have been tested for their reproductive toxicity in this species. In this study, we investigate the effects of four EASs with different affinities to the vertebrate estrogen and androgen receptors (chlordecone as an estrogen; cyproterone acetate, fenitrothion and vinclozolin as anti-androgens) on the reproduction of L. stagnalis in a 21-day semi-static test. Testosterone and 17α-ethinylestradiol (EE2) were used as the reference compounds. The tested EASs had no significant effect on growth and survival at the tested concentration ranges (ng to μg/L). Classical reproduction endpoints (i.e., oviposition and fecundity) were not responsive to the tested chemicals, except for chlordecone and 17α-ethinylestradiol, which hampered reproduction from 19.6 μg/L and 17.6 μg/L, respectively. The frequency of polyembryonic eggs, used as an additional endpoint, demonstrated the effects of all compounds except EE2. The molecular pathways, which are involved in such reproduction impairments, remain unknown. Our results suggest that egg quality is a more sensitive endpoint as compared to other reproductive endpoints commonly assessed in mollusk toxicity tests. [less ▲]

Detailed reference viewed: 44 (16 ULiège)
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See detailInvestigating cell-carrier combinations for bone formation using a mathematical model
Manhas, Varun ULiege; Guyot, Yann ULiege; Chai, Yoke C et al

Poster (2014, November 28)

This study describes the development and implementation of a bio-regulatory model that focuses on the Ca2+ release from CaP scaffolds and aims to determine the local Ca2+ concentration of different ... [more ▼]

This study describes the development and implementation of a bio-regulatory model that focuses on the Ca2+ release from CaP scaffolds and aims to determine the local Ca2+ concentration of different clinical grade CaP scaffold types during bone formation. [less ▲]

Detailed reference viewed: 21 (4 ULiège)
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See detailInvestigating Circumferential Non-Uniformities in Throughflow Calculations using an Harmonic Reconstruction
Thomas, Jean-Philippe ULiege; Léonard, Olivier ULiege

in Proceedings of the ASME Turbo Expo 2008 (2008, June)

The flow field in a multistage turbomachine is very complex. It is 3D, unsteady and turbulent. Even if modern simulation tools can describe most of the flow features, the computation time needed and the ... [more ▼]

The flow field in a multistage turbomachine is very complex. It is 3D, unsteady and turbulent. Even if modern simulation tools can describe most of the flow features, the computation time needed and the extraction of useful information remain severe drawbacks to systematic use of URANS codes in a design procedure. In this context the throughflow simulation proved to be more convenient. Nevertheless the need for empiricism limits the potential of throughflow solvers. As an alternative, Admaczyck (1984) proposed three averaging operators (ensemble, time and passage) that lead to the average-passage model, linking the unsteady turbulent flow field to a steady flow field in a typical blade passage. This model involves additional terms that respectively bring back the mean effect of turbulence, deterministic unsteadiness and aperiodicity on the mean periodic flow. These terms need to be modelled; it is the closure problem. Harmonic closure, which consists in solving a linearized perturbation system in the frequency domain, revealed to be an efficient method to approximate deterministic stresses (He and Ning, 1998, Stridh, 2005, Vilmin, 2006). A fourth averaging can be performed, a circumferential averaging, giving rise to the throughflow model. Additional terms appear: the so-called circumferential stresses. It has been proven that these terms play an important role in the description of the flow (Jennions, 1986, Perrin, 1995), being at least as considerable as deterministic stresses. Introducing these terms in a throughflow simulation allows to reproduce the averaged 3D steady flow field (Simon, 2007). The aim of the present contribution is to prove that harmonic method can potentially be used to reconstruct circumferential stresses. The importance of circumferential stresses in a throughflow simulation is first highlighted on a single stage low speed compressor testcase, for viscous and non-viscous flow fields. The second step is the characterization of the frequency spectrum of the circumferential perturbation field. Next are compared the stresses associated to a Fourier reconstruction of the perturbation field with the real ones. Finally the approximated circumferential stresses are injected into a throughflow simulation tool to analyse and demonstrate their capability to reproduce a 3D averaged flow field. [less ▲]

Detailed reference viewed: 92 (18 ULiège)
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See detailInvestigating Depth-Fanout Trade-Off in WiMAX Mesh Networks
Nahle, Salim; Iannone, Luigi; Donnet, Benoît ULiege et al

in 1st WEIRD Workshop on WiMAX, Wireless and Mobility (2007, May)

In the last years, Wireless Mesh Networks (WMNs) have been an emerging technology for providing cost/effective broadband Internet access. The research done insofar usually assumes that the wireless ... [more ▼]

In the last years, Wireless Mesh Networks (WMNs) have been an emerging technology for providing cost/effective broadband Internet access. The research done insofar usually assumes that the wireless backbone of a WMN is built using IEEE 802.11 technologies. Such an approach has the drawback of leading to dense and sub-optimal deployments, due to the short transmission range of this standard. Recently standardized, the WiMAX technology is supposed to transcend this limitation by a transmission range of several miles. In particular, the mesh mode of the WiMAX standard enables direct communications between subscriber stations and, hence, reduces dead zones while increasing the global throughput. In this paper, we investigate the throughput capacity of a WiMAX mesh tree. More specifically, we are interested in balancing the impact of the depth of the tree with its fanout. We provide a traffic model and evaluate the WiMAX mesh tree by simulations. [less ▲]

Detailed reference viewed: 55 (0 ULiège)
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See detailInvestigating Effect of Holidays on Daily Traffic Counts: Time Series Approach
Cools, Mario ULiege; Moons, Elke; Wets, Geert

in Proceedings of the 86th Annual Meeting of the Transportation Research Board (CD-ROM) (2007)

In this paper, different modeling philosophies are explored in order to explain and forecast daily traffic counts. The main objectives of this study are the analysis of the impact of holidays on daily ... [more ▼]

In this paper, different modeling philosophies are explored in order to explain and forecast daily traffic counts. The main objectives of this study are the analysis of the impact of holidays on daily traffic, and the forecasting of future traffic counts. Data coming from single inductive loop detectors, collected in 2003, 2004 and 2005, were used for the analysis. The different models that were investigated showed that the variation in daily traffic counts could be explained by weekly cycles. The Box-Tiao modeling approach was applied to quantify the effect of holidays on daily traffic. The results showed that traffic counts were significantly lower for holiday periods. When the different modeling techniques were compared with respect to forecasting with a large forecast horizon, Box-Tiao modeling clearly outperformed the other modeling strategies. Simultaneous modeling of both the underlying reasons of travel, and revealed traffic patterns, certainly is a challenge for further research. [less ▲]

Detailed reference viewed: 27 (2 ULiège)
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See detailInvestigating Effect of Holidays on Daily Traffic Counts: Time Series Approach
Cools, Mario ULiege; Moons, Elke; Wets, Geert

in Transportation Research Record: Journal of the Transportation Research Board (2007), 2019

In this paper, different modeling philosophies are explored in order to explain and forecast daily traffic counts. The main objectives of this study are the analysis of the impact of holidays on daily ... [more ▼]

In this paper, different modeling philosophies are explored in order to explain and forecast daily traffic counts. The main objectives of this study are the analysis of the impact of holidays on daily traffic, and the forecasting of future traffic counts. Data coming from single inductive loop detectors, collected in 2003, 2004 and 2005, were used for the analysis. The different models that were investigated showed that the variation in daily traffic counts could be explained by weekly cycles. The Box-Tiao modeling approach was applied to quantify the effect of holidays on daily traffic. The results showed that traffic counts were significantly lower for holiday periods. When the different modeling techniques were compared with respect to forecasting with a large forecast horizon, Box-Tiao modeling clearly outperformed the other modeling strategies. Simultaneous modeling of both the underlying reasons of travel, and revealed traffic patterns, certainly is a challenge for further research. [less ▲]

Detailed reference viewed: 52 (4 ULiège)
Peer Reviewed
See detailInvestigating Expertise, Flexibility and Resilience in Socio-technical Environments : A Case Study in Robotic Surgery.
Nyssen, Anne-Sophie ULiege; Blavier, Adelaïde ULiege

in Hollnagel, Erik; Braithwaite, Jeffrey; Wears, Robert (Eds.) Resilient Health Care (2013)

Detailed reference viewed: 53 (13 ULiège)
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See detailInvestigating Hardy-Weinberg equilibrium in case-control or cohort studies or meta-analysis.
Ziegler, Andreas; Van Steen, Kristel ULiege; Wellek, Stefan

in Breast Cancer Research and Treatment (2011), 128(1), 197-201

Yu et al. (Breast Cancer Res Treat 117:675-677, 2009) recently stated that testing for deviation from Hardy-Weinberg equilibrium (HWE) is necessary to identify systematic genotyping errors in case-control ... [more ▼]

Yu et al. (Breast Cancer Res Treat 117:675-677, 2009) recently stated that testing for deviation from Hardy-Weinberg equilibrium (HWE) is necessary to identify systematic genotyping errors in case-control studies. They criticized a meta-analytic study for the deviation from HWE in the case group of one study. The aim of this article is twofold. First, we derive recommendations on how to test for deviations from HWE in different study designs. Second, we develop a meta-analytic framework for assessing compatibility with HWE or measuring deviation from HWE. The authors sketch the possible reasons behind deviation from HWE and provide guidelines for proper investigation of HWE deviations in different study designs. The authors argue that the standard HWE chi(2) lack of fit test is logically flawed and provide a logically unflawed approach for measuring deviation from HWE using confidence intervals. The proposed method is applicable to meta-analyses of both case-control or cohort association studies. The proposed approach is illustrated using the meta-analysis criticized by Yu et al. Heterogeneity between studies can be assessed. The critique of Yu et al. to the article of Frank et al. (Breast Cancer Res Treat 111:139-144, 2008) can be refuted. Even more, validity of HWE can be proven for the pooled control sample. The authors advocate the use of a confidence interval-based approach to assess HWE. The latter should only be investigated in control populations. In multicenter studies or meta-analysis, deviation from HWE should be analyzed using a meta-analytic approach. [less ▲]

Detailed reference viewed: 60 (5 ULiège)
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See detailInvestigating in vitro calcium dissolution using a mathematical model
Manhas, Varun ULiege; Guyot, Yann; Kerckhofs, Greet et al

Scientific conference (2016, March)

Detailed reference viewed: 32 (6 ULiège)
See detailInvestigating iron and organic matter incorporation in growing sea ice
Janssens, J.; Delille, Bruno ULiege; de Jong et al

Conference (2014, March)

High concentration of exopolysacharides (EPS) and iron have been found in sea ice surrounding the Antarctic continent. However, the mechanisms leading to that enrichment remain unclear. Scavenging of iron ... [more ▼]

High concentration of exopolysacharides (EPS) and iron have been found in sea ice surrounding the Antarctic continent. However, the mechanisms leading to that enrichment remain unclear. Scavenging of iron by organic matter in seawater and entrainment during sea ice formation are thought to be responsible for the accumulation of iron in sea ice. EPS could also play a role in the iron passive chelative scavenging process in sea ice and in the increase of iron bioavailability. Our study investigates the processes responsible for the accumulation of iron (dissolved, particulate and total dissolvable iron), EPS, dissolved and particulate organic matter, macro-nutrients (silicic acid, nitrate and nitrite, phosphoric acid and ammonium), chlorophyll a and sea ice algae in young sea ice during an Australian-lead spring voyage off East Antarctica (SIPEX II September – November 2012) and a German-lead winter voyage to the Weddell Sea (AWECS June – August 2013). We used a combination of field- (“in situ”) and laboratory- based sea ice growth time-series experiments. In addition different types of newly formed sea ice as pancake ice, grey ice, frost flowers and slush were collected during both voyages as a means to compare and validate the experimental data. To our knowledge, this is the first report on the biogeochemical properties of newly formed Antarctic pack ice samples in the winter. Ice temperature, salinity and textures are also presented to support the biogeochemical observations at the onset of sea ice formation. [less ▲]

Detailed reference viewed: 147 (1 ULiège)
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See detailInvestigating local Ca2+ concentration in calcium phosphate scaffolds for bone tissue engineering applications
Manhas, Varun ULiege; Guyot, Yann ULiege; Chai, Yoke C et al

Conference (2014, October)

Detailed reference viewed: 76 (17 ULiège)
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See detailInvestigating missing sources of formic acid
Franco, Bruno ULiege; Taraborrelli, Domenico; Schultz, Martin G.

Scientific conference (2016, September 28)

Detailed reference viewed: 26 (4 ULiège)