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See detailHow large is the Io UV footprint?
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2010)

Located close to the feet of the magnetic field lines connecting Io to each Jovian hemisphere, the Io footprint is the auroral signature of the electromagnetic interaction between Io and Jupiter's ... [more ▼]

Located close to the feet of the magnetic field lines connecting Io to each Jovian hemisphere, the Io footprint is the auroral signature of the electromagnetic interaction between Io and Jupiter's magnetosphere. It consists of several spots followed downstream by an extended tail. The size of the main spot is expected to scale to the size of the interaction region close to Io. Consequently, this quantity is crucial to understand the processes involved. However, the main spot size is a controversial issue as previously published values range from ~400 km to ~10000 km, leading to contradictory conclusions. Based on observations carried on with the Hubble Space Telescope STIS and ACS FUV instruments from 1997 to 2009, we estimate the size of the main footprint spot on a much larger image sample than previously. Additionally, we carefully selected the images in order to avoid viewing geometry ambiguities when measuring the spatial extent of the different features. The main spot length along the footpath is ~900 km while its width perpendicular to the footpath is <200 km. The spot length is larger than the projected diameter of Io along unperturbed magnetic field lines, which appears to be consistent with recent simulations. The vertical extent and the peak altitude of the main spot are similar to those measured in the tail. Nevertheless, the secondary spot attributed to trans-hemispheric electron beams has been measured to peak at ∼200 km below the main spot and the tail, which confirms their different origins. [less ▲]

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See detailHow learning methods in anatomy allow a boost of visuospatial abilities for undergraduate students
Defaweux, Valérie ULg; Ernst, Denise; Dernier, Adrienne ULg et al

Poster (2017, April 24)

Because it is know that visuospatial abilities affect anatomy learning and that our students are heterogeneous related to these competences, it is essential to offer an educational strategy designed to ... [more ▼]

Because it is know that visuospatial abilities affect anatomy learning and that our students are heterogeneous related to these competences, it is essential to offer an educational strategy designed to specifically train and develop those skills at the beginning of the anatomy courses. We managed to offer various formative activities that improve visuospatial skills. [less ▲]

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See detailHow lesbian parenting leads to reassess bisexuality and thirdness
Naziri, Despina ULg

Conference given outside the academic context (2015)

Using data from a clinical psychoanalytic study of lesbian couples undertaking Artificial Insemination by Donor (AID), the conference explores how female same sex parenting is related to the notion of the ... [more ▼]

Using data from a clinical psychoanalytic study of lesbian couples undertaking Artificial Insemination by Donor (AID), the conference explores how female same sex parenting is related to the notion of the third and to the concept of bisexuality by focusing on two specific themes: the position attributed to the donor, who is unknown to the lesbian parents, as well as the process of evolution and attribution of the place of each mother in the lesbian couple. Our aim is to highlight the complexity of the issue of the third in same-sex parenting by analysing fantasised constructions surrounding the image of the anonymous donor, the impact of the medical act of insemination on the women’s psychic economy and the search for other promising bases for triangulation. We would also like to demonstrate the complexity of the issue of bisexuality: although the project of having a child mobilizes a wide range of identifications for both parental imagos, the whole procedure leading to AID shakes up omnipotent sexual fantasies, mobilizes the fantasy of the heterosexual primal scene and makes necessary further elaboration of the feminine side of bisexuality in the context of gender differences. [less ▲]

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See detailHow licensing can address new challenges? The question of brokering
Michel, Quentin ULg

Conference given outside the academic context (2010)

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See detailHow light and occupational therapy intervention could fight some psychogeriatric symptoms
Maggi, Patrick ULg; Bassain, Fatima; Gosset, Christiane ULg et al

Conference (2014, November 27)

Purpose: Aggregated results of systematic reviews separately show how light used as a treatment and some occupational therapy interventions could have a positive impact on psychobehavioural disorders in ... [more ▼]

Purpose: Aggregated results of systematic reviews separately show how light used as a treatment and some occupational therapy interventions could have a positive impact on psychobehavioural disorders in older people. Since the beginning of June 2014 the Walloon Government has been financing a project which consists of a non-pharmacological approach that combines light and occupational therapy for a psychogeriatric population with specific symptoms: spatial and temporal disorientations, apathy, depression, agitation, anxiety, confusion and circadian disorder. The objective of this abstract is to expose the assumptions that the combination of two different light devices and one specific occupational therapy program could have an impact on the different symptoms of a psychogeriatric population. Methods: To build our hypothesis, two literature reviews have been achieved. The first one concerning the use of light as therapy gathered 30 studies while the other one about occupational therapy activities collected 35 articles. Results: Despite of a heterogeneity between studies dealing with light and occupational therapy, the combination of these two non-pharmacological interventions might fight the depressive syndrome, reduce the temporal disorientation thanks to a regularity in the period of activity, restore the circadian rhythm and so reduce some troubles that can be linked to them: sleep disorder, risk of fall, apathy, agitation, behavioural and cognitive troubles (attention, concentration). Moreover, one of the two light devices used which can modulate the light intensity according to the rooms might reduce the spatial disorientation if it’s employed as a landmark. Conclusions: Based on literature reviews and our experience into this field it’s seems that a non-pharmacological approach involving light and occupational therapy intervention could have a positive effect on symptoms of psychogeriatric population. In admitting that those effects are becoming true after experimentation and analyses, we can also expect an improvement of the quality of life. [less ▲]

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See detailHow long should we measure? An exploration of factors controlling the inter-annual variation of catchment sediment yield
Vanmaercke, Matthias ULg; Poesen, J.; Radoane, M. et al

in Journal of Soils and Sediments (2012), 12(4), 603-619

Purpose: Although it is well-known that catchment suspended sediment yields (SY; tons per square kilometre per year) can vary significantly from year to year, little information exists on the magnitude ... [more ▼]

Purpose: Although it is well-known that catchment suspended sediment yields (SY; tons per square kilometre per year) can vary significantly from year to year, little information exists on the magnitude and factors controlling this variability. This is crucial to assess the reliability of average SY values for a given measuring period (MP) and is of great geomorphic significance. This paper aims to bridge this research gap. Materials and methods: A worldwide database was compiled with time series of measured SY values. Data from 726 rivers (mostly located in Europe, the Middle East and the USA) were collected, covering 15,025 annual SY observations. The MPs ranged between 7 and 58 years, while catchment areas (A) ranged between 0.07 and 1.84 × 106 km2. For 558 catchments, the annual runoff depths corresponding to the SY observations were also available. Based on this database, inter-annual variability was assessed for each catchment, and relationships with factors potentially explaining this variability were explored. Results and discussion: Coefficients of variation of SY varied between 6% and 313% (median 75%). Annual SY data were generally not normally distributed but positively skewed. Inter-annual variability generally increased with increasing average SY. No significant relationship was found between the inter-annual variability of SY and A, while weak but significant relationships were noted with the variability in annual runoff and rainfall depths. Detailed analyses of a sub-dataset corresponding to 63 catchments in Romania revealed no clear relationships between inter-annual variability of SY and land-use or topographic characteristics. Nevertheless, indications were found that variability was larger for catchments with erosion-prone land-use conditions. Using a Monte Carlo simulation approach, the effect of inter-annual variability on the reliability of average SY data was assessed. Results indicate that uncertainties are very large when the MP is short, with median relative errors ranging between -60% and 83% after 5 years of monitoring. Furthermore, average SY values based on short MPs have a large probability to underestimate, rather than to overestimate, the long-term mean. For instance, the SY value of a median catchment after a 1-year MP has a 50% probability of underestimating the long-term mean by about 22%. Uncertainties quickly decrease after the first few years of measurement but can remain considerable, even after 50 years of monitoring. Conclusions: It is important to consider uncertainties associated with average SY values due to inter-annual variability, for example when attempting to predict long-term average SY values using a steady-state model, as such uncertainties put fundamental limits to the predictive capabilities of such models. © 2012 Springer-Verlag. [less ▲]

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See detailHow Mannheimia haemolytica defeats host defence through a kiss of death mechanism
Zecchinon, Laurent ULg; Fett, Thomas ULg; Desmecht, Daniel ULg

in Veterinary Research (2005), 36(Mar-Apr), 133-156

Mannheimia haemolytica induced pneumonias are only observed in goats, sheep and cattle. The bacterium produces several virulence factors,whose principal ones are lipopolysaccharide and leukotoxin. The ... [more ▼]

Mannheimia haemolytica induced pneumonias are only observed in goats, sheep and cattle. The bacterium produces several virulence factors,whose principal ones are lipopolysaccharide and leukotoxin. The latter is cytotoxic only for ruminant leukocytes, a phenomenon that is correlated with its ability to bind and interact with the ruminant beta2-integrin Lymphocyte Function-associated Antigen 1. This paper globally reviews all the information available on host-pathogen interactions underlying respiratory mannheimiosis (formerly pasteurellosis), from the stable and the Petri dish to the biochemical cascade of events triggered by the leukotoxin inside ruminant leukocytes. One conclusion can be made: the most widespread cattle respiratory disease with the most important impact on beef production worldwide, is probably due to a tiny ruminant-specific focal variation in the CD18- and/or CD11a-expressing genes. [less ▲]

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See detailHOW MANY HIPPOS (HOMHIP): Algorithm for automatic counts of animals with infra-red thermal imagery from UAV
Lhoest, Simon ULg; Linchant, Julie ULg; Quevauvillers, Samuel ULg et al

in International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences (2015), XL-3/W3

The common hippopotamus (Hippopotamus amphibius L.) is part of the animal species endangered because of multiple human pressures. Monitoring of species for conservation is then essential, and the ... [more ▼]

The common hippopotamus (Hippopotamus amphibius L.) is part of the animal species endangered because of multiple human pressures. Monitoring of species for conservation is then essential, and the development of census protocols has to be chased. UAV technology is considering as one of the new perspectives for wildlife survey. Indeed, this technique has many advantages but its main drawback is the generation of a huge amount of data to handle. This study aims at developing an algorithm for automatic count of hippos, by exploiting thermal infrared aerial images acquired from UAV. This attempt is the first known for automatic detection of this species. Images taken at several flight heights can be used as inputs of the algorithm, ranging from 38 to 155 meters above ground level. A Graphical User Interface has been created in order to facilitate the use of the application. Three categories of animals have been defined following their position in water. The mean error of automatic counts compared with manual delineations is +2.3% and shows that the estimation is unbiased. Those results show great perspectives for the use of the algorithm in populations monitoring after some technical improvements and the elaboration of statistically robust inventories protocols. [less ▲]

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See detailHow Many Hippos (HOMHIP): Algorithm for automatic counts of animals with infrared thermal imagery from UAV
Lhoest, Simon ULg; Linchant, Julie ULg; Quevauvillers, Samuel ULg et al

in The International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences (2015), XL-3/W3

The common hippopotamus (Hippopotamus amphibius L.) is part of the animal species endangered because of multiple human pressures. Monitoring of species for conservation is then essential, and the ... [more ▼]

The common hippopotamus (Hippopotamus amphibius L.) is part of the animal species endangered because of multiple human pressures. Monitoring of species for conservation is then essential, and the development of census protocols has to be chased. UAV technology is considering as one of the new perspectives for wildlife survey. Indeed, this technique has many advantages but its main drawback is the generation of a huge amount of data to handle. This study aims at developing an algorithm for automatic count of hippos, by exploiting thermal infrared aerial images acquired from UAV. This attempt is the first known for automatic detection of this species. Images taken at several flight heights can be used as inputs of the algorithm, ranging from 38 to 155 meters above ground level. A Graphical User Interface has been created in order to facilitate the use of the application. Three categories of animals have been defined following their position in water. The mean error of automatic counts compared with manual delineations is +2.3% and shows that the estimation is unbiased. Those results show great perspectives for the use of the algorithm in populations monitoring after some technical improvements and the elaboration of statistically robust inventories protocols. [less ▲]

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See detailHow many nursery pigs can eat at one wet/dry feeder space
Laitat, Martine ULg; Dewey

Article for general public (2002)

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See detailHow many scribes worked on the Egyptian Recension of the Thousand and One Nights?...
Franssen, Elise ULg

Conference (2013, October 11)

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See detailHow many species in the Black rat complex (Rattus rattus sensu lato) in Southeast Asia?
Pagès, Marie ULg; Galan, Maxime; Chaval, Yannick et al

Conference (2011, July)

Black rats are among the major invasive vertebrates with severe ecological, economic and health impacts. Remarkably, the evolutionary history of black rats has received little attention and there is no ... [more ▼]

Black rats are among the major invasive vertebrates with severe ecological, economic and health impacts. Remarkably, the evolutionary history of black rats has received little attention and there is no firm agreement as how many species should be recognized within the Rattus rattus complex. Members of the species complex are native from India and Southeast Asia. Current taxonomy suggests that four taxa live in sympatry in several places of Thailand and Cambodia where the present study was conducted: three accepted species (R. tanezumi, R. losea, R. argentiventer) and an additional lineage of unclear taxonomic status sometimes referred as Rattus R3. We used an extensive sampling, morphological data and diverse genetic markers of different evolutionary rates and parental inheritance (two mtDNA genes, one nuclear gene and eight microsatellite loci) to assess the genetic structure among the four taxa. Genetic analyses revealed discordant patterns between the mt and the nuclear data. The mt phylogeny identified three reciprocally monophyletic clades corresponding to the four putative taxa while the nuclear phylogeny failed to separate tanezumi and R3. Within geographic localities, microsatellites revealed free gene flow between tanezumi and R3 but no gene flow between those two taxa and losea or argentiventer. Altogether theses analyses do not support the taxon R3 as a valid species and advocate for synonymy with tanezumi. As a consequence, R. tanezumi becomes paraphyletic with respect to losea. Simulation analyses are now ongoing to determine whether a recent speciation event between tanezumi and losea, or an incomplete lineage sorting within tanezumi could explain this uncommon pattern. [less ▲]

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See detailHow many women can benefit from a full intrapartum antibiotic prphylaxis for prevention of perinatal group B streptococcal disease?
MELIN, Pierrette ULg; Lorquet, Sophie; Rodriguez Cuns, Grisel et al

in American Society of Microbiology (Ed.) Program and Abstracts of the 44th Intersciences Conference on Antimicrobial Agents and Chemotherapy (2004, November)

Background: In Belgium as in many Western countries, GBS are still the leading cause of severe perinatal infections. Current guidelines for prevention recommend intrapartum antimicrobial prohylaxis (IAP ... [more ▼]

Background: In Belgium as in many Western countries, GBS are still the leading cause of severe perinatal infections. Current guidelines for prevention recommend intrapartum antimicrobial prohylaxis (IAP) administered promptly before delivery to pregnant women colonized with GBS. The risk of vertical GBS transmission to the newborn decreases as the duration of prophylaxis increases. The considered threshold for prophylaxis adequacy is the first dose administered at least 4 hours before delivery. Objective: To evaluate the proportion of pregnant women who could benefit from an adequate IAP for the prevention of GBS perinatal infections. Methods: Between June and October 2003, we recorded in two hospitals the elapse time between admission for labor and delivery. We assumed 5 hours represent a useful threshold to allow admission, revision of chart and administration of adequate IAP. The status of vaginal colonization with GBS was determined by CDC’s recommended culture method with Granada agar added. Results: Among 532 women, 27.3 % delivered within 5 hours after admission for labor. The colonization rate for GBS was 25.6 %. The distribution of elapse time between admission and delivery for GBS colonized pregnant women was not significantly different from non colonized women (p <= 1). Conclusions: 1) With the current prevention strategy, 27.3 % of these pregnant women would not have benefit from adequate prophylaxis 2) These results highlight the importance of an efficient organization to warranty prompt administration of IAP as soon as possible when mandatory. 3) If a rapid intrapartum screening test is used, no delay can be afforded “from ward to bench to bed”. [less ▲]

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See detailHow measuring glomerular filtration rate? Comparison of reference methods
DELANAYE, Pierre ULg

in Sahay, Manisha (Ed.) Basic Nephrology and Acute Kidney Injury (2012)

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See detailHow Measuring Glomerular Filtration Rate? Comparison of reference methods
DELANAYE, Pierre ULg

in Sahay, Manisha (Ed.) Basic Nephrology and Acute Kidney injury (2012)

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See detailHow microbes network (and are networked) in geological disposal research: a sociological perspective
Van Oudheusden, Michiel ULg; Schröder, Jantine; Turcanu, Catrinel

Conference (2017, May 05)

In MIND subtask 3.2, we ascertain whether and how microbes, microbiologists, and microbiology are enrolled into research on the geological disposal of radioactive waste. We adopt a social studies of ... [more ▼]

In MIND subtask 3.2, we ascertain whether and how microbes, microbiologists, and microbiology are enrolled into research on the geological disposal of radioactive waste. We adopt a social studies of science (actor-network theory) perspective that observes how actors within MIND (e.g. MIND researchers, members of the MIND Implementer Review Board) and outside the project (e.g. geologists, waste management regulators, policy makers) process data and generate insights on the role of microbes in waste disposal, and how these processes elicit challenges and opportunities for enrolment. Examples of the latter include mixed appreciations of the impact of microbial activity on artificial barriers (e.g. negligible vs. substantial), the scope for, and appeal of, institutional uptake of microbiology research (e.g. through the coupling of microbiology research to “the safety case”), and the (re)drawing of disciplinary boundaries (e.g. between microbiology and geology). Drawing on these and related examples, we explore how through projects like MIND, microbes network, and are networked, differently for the joint purpose of radioactive waste disposal. [less ▲]

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See detailHow Much Discretion do, and should, Competition Authorities enjoy in the Course of their Enforcement Activities? A Multi-Jurisdictional Assessment
Petit, Nicolas ULg

in Concurrences : Revue des Droits de la Concurrence (2010), (1), 44-62

The purpose of this study is to assess whether competition agencies (“CAs”) do, and in turn should, enjoy an unfettered discretionary power in the context of the investigation of competition law ... [more ▼]

The purpose of this study is to assess whether competition agencies (“CAs”) do, and in turn should, enjoy an unfettered discretionary power in the context of the investigation of competition law infringements or whether their margin of discretion should be subject to certain limits. To this end, it focuses on four successive areas where CAs may be entitled to make choices, i.e. detection of infringements, selection of enforcement targets, initiation of infringement proceedings and outcome of the case. Thanks to reports received from 21 national experts in response to a questionnaire covering 18 jurisdictions, the present study formulates a number of public policy proposals. [less ▲]

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