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See detailHotelling’s T 2 control chart with two adaptive sample sizes
Faraz, Alireza ULg; Moghadam, M. B.

in Quality & Quantity (2009), 43

Some quality control schemes have been developed when several related quality characteristics are to be monitored. The familiar multivariate process monitoring and control procedure is the Hotelling’s T 2 ... [more ▼]

Some quality control schemes have been developed when several related quality characteristics are to be monitored. The familiar multivariate process monitoring and control procedure is the Hotelling’s T 2 control chart for monitoring the mean vector of the process. It is a direct analog of the univariate shewhart ¯ x chart. As in the case of univariate, the ARL improvements are very important particularly for small process shifts. In this paper, we study the T 2 control chart with two-state adaptive sample size, when the shift in the process mean does not occur at the beginning but at some random time in the future. Further, the occurrence time of the shift is assumed to be exponentially distributed random variable. [less ▲]

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See detailHotelling’s T2 control chart with two adaptive sample sizes
Faraz, Alireza ULg; Moghadam, M. B.

in Quality & Quantity (2009), 43(6), 903-913

Some quality control schemes have been developed when several related quality characteristics are to be monitored. The familiar multivariate process monitoring and control procedure is the Hotelling’s T 2 ... [more ▼]

Some quality control schemes have been developed when several related quality characteristics are to be monitored. The familiar multivariate process monitoring and control procedure is the Hotelling’s T 2 control chart for monitoring the mean vector of the process. It is a direct analog of the univariate shewhart ¯ x chart. As in the case of univariate, the ARL improvements are very important particularly for small process shifts. In this paper, we study the T 2 control chart with two-state adaptive sample size, when the shift in the process mean does not occur at the beginning but at some random time in the future. Further, the occurrence time of the shift is assumed to be exponentially distributed random variable. [less ▲]

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See detailHotspot Decorations Map Plasmonic Patterns with the Resolution of Scanning Probe Techniques
Valev, V. K.; Silhanek, Alejandro ULg; Jeyaram, Y. et al

in Physical Review Letters (2011), 106(22),

In high definition mapping of the plasmonic patterns on the surfaces of nanostructures, the diffraction limit of light remains an important obstacle. Here we demonstrate that this diffraction limit can be ... [more ▼]

In high definition mapping of the plasmonic patterns on the surfaces of nanostructures, the diffraction limit of light remains an important obstacle. Here we demonstrate that this diffraction limit can be completely circumvented. We show that upon illuminating nanostructures made of nickel and palladium, the resulting surface-plasmon pattern is imprinted on the structures themselves; the hotspots (regions of local field enhancement) are decorated with overgrowths, allowing for their subsequent imaging with scanning-probe techniques. The resulting resolution of plasmon pattern imaging is correspondingly improved. [less ▲]

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See detailHotspots, complementarity or representativeness? Designing optimal small-scale reserves for biodiversity conservation
Kati, V.; Devillers, P.; Dufrêne, Marc ULg et al

in Biological Conservation (2004), 120(4), 471-480

Reserve networks are a major tool of ecological management aiming at biodiversity conservation. Maximizing the number of species conserved with the minimum land sacrifice is a primary requirement in ... [more ▼]

Reserve networks are a major tool of ecological management aiming at biodiversity conservation. Maximizing the number of species conserved with the minimum land sacrifice is a primary requirement in reserve design. In this study, we examine the efficiency of five different scenarios to conserve: (i) the biodiversity of one target group and (ii) the overall biodiversity of an area. The study was conducted in Dadia Reserve, in northern Greece. Six groups of species were selected to represent its biodiversity: woody plants, orchids, Orthoptera, aquatic and terrestrial herpetofauna, and small terrestrial birds. The scenarios examined represent different conservation approaches to select network sites. For each approach, the starting point was one of the above six groups of species, considered as the target group. In scenario A, which reflects the hotspot approach, the sites richest in species are selected. Scenario B selects the sites most complementary in terms of species richness. The next two scenarios use the principle of environmental representativeness, expressed in terms of habitat (scenario C) or vegetation (scenario D). Under scenario E, sites forming the network are selected at random. The rank of scenarios in terms of preserving the species of the target group was always B>A>C>D>E, irrespective of the group considered as target group. Their rank, when preservation of the total biodiversity was the issue, was B, A>C, D>E. © 2004 Elsevier Ltd. All rights reserved. [less ▲]

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See detailHourglass chondrules
Warin, Roger; Hatert, Frédéric ULg; Kashuba, John

in Meteorite (2011), November 2010

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See detailHousehod dynamics and the well-beeing after partnership dissolution
Bould, S.; Hartmann, P.; Schmaus, G. et al

Conference (2007)

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See detailHousehold bushmeat consumption in Brazzaville, the Republic of the Congo.
Mbete, Roger Albert; Banga-Mboko, Henri; Racey, Paul et al

in Tropical Conservation Science (2011), 4(2), 187-202

Wildlife meat is an important source of animal protein for rural and urban populations in Congo. Quantitative and qualitative surveys on the consumption of bushmeat were undertaken in Brazzaville in 2006 ... [more ▼]

Wildlife meat is an important source of animal protein for rural and urban populations in Congo. Quantitative and qualitative surveys on the consumption of bushmeat were undertaken in Brazzaville in 2006, in about 1,050 urban households. The main objective was to establish the profiles of consumers and of species concerned. The results showed that 88.3% of the surveyed households consumed bushmeat. Their average size was 5.7 ± 3.2 persons. The average monthly income of an urban consumer with a permanent job was 98,334 (US$197) ± 84,306 (US$169) FCFA. It appeared that households preferred to consume bushmeat for two major reasons: the taste or flavor (67.8%) and food habits (14.7%). Meat from mammals was preferred, the top three orders of this class being artiodactyls (48.3%), rodents (28.3%), and primates (13.0%). Some of them are listed as threatened in Congo Brazzaville and are included in the IUCN Red List. The results showed that in Brazzaville, bushmeat consumption remains important and is determined by socio-economic parameters. The promotion of game farming, and breeding of domestic species such as poultry and fish, in the Brazzaville suburbs could help to meet Congolese demand for bushmeat. [less ▲]

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See detailHouseholds' net income and food consumption in the context of the current financial crisis (a case study in Hanoi suburban)
Vu Dinh, Ton; Phan Dang, Thang; Duquesne, Brigitte ULg et al

in Vietnam’s Socio-Economic Development [=VSED]: a Social Science Review (2010), March 2010(61), 69-80

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See detailHouseholds' net incomes and food consumption in suburban Hanoi
Vu Dinh, Ton; Phan Dang, Thang ULg; Duquesne, Brigitte et al

in Hanoi University of Agriculture; Francophone Joint University Council (CIUF) (Eds.) Proceedings of Scientific Research Results - Institutional University Cooperation Program 2008-2012 (2013)

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See detailHousekeeping Genes as Internal Standards: Use and Limits
Thellin, Olivier ULg; Zorzi, Willy ULg; Lakaye, Bernard ULg et al

in Journal of Biotechnology (1999), 75(2-3), 291-5

Quantitative studies are commonly realised in the biomedical research to compare RNA expression in different experimental or clinical conditions. These quantifications are performed through their ... [more ▼]

Quantitative studies are commonly realised in the biomedical research to compare RNA expression in different experimental or clinical conditions. These quantifications are performed through their comparison to the expression of the housekeeping gene transcripts like glyceraldehyde-3-phosphate dehydrogenase (G3PDH), albumin, actins, tubulins, cyclophilin, hypoxantine phsophoribosyltransferase (HRPT), L32. 28S, and 18S rRNAs are also used as internal standards. In this paper, it is recalled that the commonly used internal standards can quantitatively vary in response to various factors. Possible variations are illustrated using three experimental examples. Preferred types of internal standards are then proposed for each of these samples and thereafter the general procedure concerning the choice of an internal standard and the way to manage its uses are discussed. [less ▲]

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See detailHOUSTON BY DAY AND NIGHT Blues-zydeco-gospel
Sacré, Robert ULg

Article for general public (2012)

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See detailHow adaptation strategies of crops could counteract climate change effects? The case of four catchments in Wallonia, Belgium.
Bauwens, Alexandra ULg; Sohier, Catherine ULg; Degré, Aurore ULg

in Geophysical Research Abstracts (2013), 15

A sharp increase in extreme heat and drought stress is projected in Belgium by the end of the 21st century, with the potential to significantly reduce crops’ yields under current agricultural practices ... [more ▼]

A sharp increase in extreme heat and drought stress is projected in Belgium by the end of the 21st century, with the potential to significantly reduce crops’ yields under current agricultural practices. This contribution uses an agro-hydrological model in order to assess the potential effects of climate evolution on crop development, yield, and water balance for the main agricultural productions in the Meuse catchment. Erosion risk is also evaluated. We show that grasslands and maize yield decrease and yield variability increases under climate change scenarios. The leaf area index study permits to put in emphasis the earlier start of the vegetation due to warmer climate. It appears that all the sensitive stages occur earlier in the season and that crops are negatively affected by summer drought stress. The better understanding of crops development under evolving climate allows us to propose some changes in agricultural practices and to assess their effectiveness. We evaluate different strategies of adaptation in agricultural practices in order to reduce the potential negative effects of climate change on grasslands and maize production. Adaptation strategies proposed are advanced sowing and harvesting date, introduction of a cover crop for maize and advance in the cutting dates for grasslands. In the particular case of the Vesdre catchment, shifting the growth period of maize permits to avoid the water-deficit period and allow increased yield. This shift makes it possible to introduce a cover crop that will drastically reduce winter soil erosion. For grassland, the adjustment of the cutting dates favored the first cut and the earlier start of the vegetation. The second cut is less profitable due to summer drought stress. The vulnerability assessments focused on the main rotation encountered in the cultivated areas and in the difference in the cover type of these crops. [less ▲]

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See detailHow are consummers' interests taken into account when applying competition law ?
Sibony, Anne-Lise ULg

Conference (2009, October 21)

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See detailHow are feathers digested by raptors?
Leprince, Pierre ULg; Dandrifosse, Guy ULg; Goffinet, Gerhard ULg et al

in Biochemical Systematics & Ecology (1980), 8(2), 211-219

In order to determine the cause of the evident degradation of feathers from ingested prey in pellets regurgitated by raptors, in vitro digestions of whole feather barbs by pellet extracts, pepsin or ... [more ▼]

In order to determine the cause of the evident degradation of feathers from ingested prey in pellets regurgitated by raptors, in vitro digestions of whole feather barbs by pellet extracts, pepsin or trypsin were carried out. The material was analysed by using biochemical and electron microscopic methods. The results show that the changes in the feathers which occur in the stomach of the Falconidae do not arise from digestion of keratin but from hydrolysis of protein acting as a cement matter in the feather. [less ▲]

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See detailHow are trace elements mobilized during the post-weaning fast in northern elephant seals?
Habran, Sarah ULg; Crocker, D; Debier, C et al

in Environmental Toxicology & Chemistry (2012), 31(10), 2354-2365

Northern elephant seal (Mirounga angustirostris) pups undergo a substantial intertissue reorganization of protein, minerals, and other cellular components during their postweaning development, which might ... [more ▼]

Northern elephant seal (Mirounga angustirostris) pups undergo a substantial intertissue reorganization of protein, minerals, and other cellular components during their postweaning development, which might entail the mobilization of associated contaminants. The authors investigated the changes in concentrations of 11 elements (Ca, Cd, Cr, Cu, Fe, Hg, Ni, Pb, Se, V, and Zn) in a longitudinal study on 22 northern elephant seal pups during the postweaning fast. Slight changes in most element concentrations were observed in blood throughout the fast. Circulating levels of Hg, Se, and Cu appeared less altered during the postweaning fast than during suckling (previously measured). Despite the considerable fat utilization, element concentrations in blubber remained stable throughout the fast (except Fe), which suggests that elements are mobilized from blubber as efficiently as lipids. As indicators of the placental transfer, concentrations in lanugo hair revealed the existence of maternal transfer and accumulation of all assayed trace elements during fetal development. In addition, the new pelage, rapidly produced after weaning, appeared to be an important elimination route for toxic metals like Hg, Cd, and Pb. The high mineral content detected in pup hair suggests that this species would be more exposed to trace elements than other phocids (except Cd and Pb). This statement needs nevertheless further monitoring and toxicological studies to determine better the exposition to trace elements and its potential impact on the northern elephant seal’s health. [less ▲]

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See detailHow are we vulnerable? Opening industrial hazards vulnerability analysis to participation
Rossignol, Nicolas ULg; Turcanu, Catrinel

Conference (2013, June 17)

The risk analysis framework has been the dominant theoretical framework used to address the uncertainty of a potential hazard bypassing the system's safeguards and protection. In essence, this involves ... [more ▼]

The risk analysis framework has been the dominant theoretical framework used to address the uncertainty of a potential hazard bypassing the system's safeguards and protection. In essence, this involves the evaluation of the probability and the magnitude of the consequences of the undesired events that can transform the hazard into actual damage. Despite the technical premises, the importance of integrating social aspects into the analysis is now recognized by an increasing number or risk analysis models. Another way to deal with potential consequences of hazards is to analyze the vulnerability of the system considered. This paradigm overcomes the shortcomings of risk analysis in situations when the knowledge about the probabilities and the outcomes is incomplete or insufficient On the one hand, studies in the literature show that socio-economic factors are often integrated in a participative way in vulnerability analysis models especially in the natural hazards research field. On the other hand, it seems that such considerations are rarely integrated in the models aiming at evaluating the vulnerability to an industrial hazard. What can we learn from the analysis of models addressing vulnerability to natural hazards in terms of the participatory integration of social factors? What could be the reasons to apply such participation tools in order to assess the vulnerability to industrial hazards? These are the questions we address in this contribution. To do so, we realized a systematic literature review from scientific journal papers on vulnerability analysis published in the last two decades. From this review, three main arguments can be found arguing for the use of participation for vulnerability analysis. Indeed, participation allows (1) context-based assessments, that may (2) foster the development of adaptative capacities (3) both for short and long-term. Based on those arguments, we identifiy possible paths to foster participation for context-based industrial vulnerability analysis. [less ▲]

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See detailHow as a transmission system operator (TSO) to respond to the growing public concern on the potential health effects of ELF exposure ?
Du Four, Vincent; Ledent, Maryse ULg; Lilien, Jean-Louis ULg et al

in Proceedings of the 2d International Conference on Extremely Low Frequency Electric and Magnetic fields (2011, March)

Public exposure of extremely low frequency (50 Hz) electric and magnetic fields are a major concern for transmission system operators.Measurements are presented as well as technical solutions to reduce ... [more ▼]

Public exposure of extremely low frequency (50 Hz) electric and magnetic fields are a major concern for transmission system operators.Measurements are presented as well as technical solutions to reduce ELF and public acceptance are discussed. [less ▲]

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See detailHow asteroseismology can constrain the global parameters of solar-like star models
Ozel, N.; Dupret, Marc-Antoine ULg; Baglin, A.

in Astrophysics & Space Science (2010), 328

In the previous years, p-mode oscillations (pressure oscillations stochastically excited by convection) have been detected in several solar-like stars thanks to the ground-based spectroscopic and space ... [more ▼]

In the previous years, p-mode oscillations (pressure oscillations stochastically excited by convection) have been detected in several solar-like stars thanks to the ground-based spectroscopic and space spectroscopic and photometric observations. We study the importance of seismic constraints on stellar modeling and the impact of their accuracy on reducing the uncertainties of global stellar parameters (i.e. mass, age, etc.). We use the Singular Value Decomposition (SVD) method to analyze the sensitivity of stellar models to seismic constraints. In this context, we construct a grid of evolutionary sequences for solar-like stars with varying age and mass. Around each model of this grid, we evaluate the partial derivatives with respect to a large set of free parameters: mass â ³, age Ï , mixing-length parameter α, initial helium abundance Y [SUB]0[/SUB], and initial metallicity Z/ X [SUB]0[/SUB]. Masses between 0.9 and 1.55 M [SUB]ȯ[/SUB] and central hydrogen abundances from Xc=0.7 to 0.05 have been considered in this study. [less ▲]

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See detailHow asteroseismology can help to precisely constrain properties of planet-host stars
Salmon, Sébastien ULg; Montalban Iglesias, Josefa ULg; Lanotte, Audrey ULg et al

Poster (2011, January)

Nowadays more than 500 exoplanets have been discovered, mainly studied by radial velocity and transit measurements. Precise knowledge on their characteristics is crucial to develop theories of planetary ... [more ▼]

Nowadays more than 500 exoplanets have been discovered, mainly studied by radial velocity and transit measurements. Precise knowledge on their characteristics is crucial to develop theories of planetary formation and evolution. In that aim, not only star and planet(s) masses but also the evolutionary stage of systems are needed. From radial velocity measurements one has to assume the inclination and the stellar mass of the system to disentangle the mass of the planet. When transit is observable, one can measure the ratio of planetary and stellar radii. Finally, the degree of evolution of the system is determined by the one of the star. Thus the host star must be well known to obtain a full set of system properties. However, determination of stellar parameters such as the mass, radius and its evolution from classical observables (Teff, log g, [Fe/H]) suffers of large uncertainties. This is particularly true for dwarf stars on the Main Sequence. Fortunately we can obtain better constrains with the help of asteroseismology. That latter approach probes the stellar properties through observation of oscillations present in stars. With the launches of high-precision photometry space missions, CoRoT and Kepler, we are now able to detect oscillations in a huge number of stars. In particular Kepler photometry, primarily intended to detect transits of planet, can give accurate stellar parameters of planetary systems as it also affords to make [less ▲]

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