Last 7 days     Results 1861-1880 of 50710.   89 90 91 92 93 94 95 96 97 98 99   Nonparametric control charts: economic statistical designMarcos Alvarez, Alejandro ; Heuchenne, Cédric ; Faraz, Alireza E-print/Working paper (2016)This paper studies economic statistical designs (ESD) for nonparametric control charts based on the sign and Wilcoxon tests. The main advantage of the procedures is that, except for the tested location ... [more ▼]This paper studies economic statistical designs (ESD) for nonparametric control charts based on the sign and Wilcoxon tests. The main advantage of the procedures is that, except for the tested location parameter, they do not use either any parametric distribution for the quality characteristic or any information about the possible involved parameters, neither in the in-control nor in the out-of-control state. This is made possible by minimizing a cost function specified independently of these quantities. Unlike the ESD for the $\overline{x}$ chart, the resulting charts designs are robust to changes of the distributions of the observations (in control or out of control), provide reliable statistical guarantees when the $\overline{x}$ chart ESD does not and stay competitive even when the strong assumptions of the $\overline{x}$ chart ESD are fully satisfied. These new techniques can therefore be applied to a definitely wider class of problems and their designs may stay constant over time without losing performance. [less ▲]Detailed reference viewed: 25 (1 ULg) Identifying mismatch between urban travel demand and transport network services using GPS data: A case study in the fast growing Chinese city of HarbinCui, JianXun; Liu, Feng; Hu, Jia et alin Neurocomputing (2016), 181The world's urban population growth and economic development have led to the reshaping of metropolitan space layouts among residential, employment and shopping locations, generating growing mismatch ... [more ▼]The world's urban population growth and economic development have led to the reshaping of metropolitan space layouts among residential, employment and shopping locations, generating growing mismatch between travel demand and transport services. A reliable method to accurately analyze mobility demand and underlying transport network systems and to identify areas with serious mismatch problems is important for the design of effective policy measures. In this paper, we make use of the wide deployment of GPS devices in vehicles in many cities today, to develop such a method. This approach is developed using GPS data collected from all taxis operating in the Chinese city of Harbin between July and September in 2013. It consists of four major steps. First, city-wide mobility patterns are modeled based on GPS trajectories. This model captures a set of key trafﬁc characteristics for each pair of regions in the entire urban network, including travel demand, travel speed and route directness of travel paths. From this model, a set of indicators is then built to measure the road transport performance between the regions, and the areas with serious mismatch problems are subsequently pinpointed. Finally, the identiﬁed problematic regions are further examined and speciﬁc transport problems are analyzed. By applying the proposed method to the city of Harbin, the potential and effectiveness of this method are demonstrated. Moreover, with more and more urban vehicles being equipped with GPS devices, the designed method can be easily transferred to other cities, thus paving a way for the adoption of the presented approach for an up-to-date and spatial-temporal sensitive road network analysis approach that supports the establishment of a more sustainable urban transport system. [less ▲]Detailed reference viewed: 16 (2 ULg) Léon d’OultresMarchandisse, Alain in Lecocq, Isabelle (Ed.) Les vitraux de la cathédrale Saint-Paul à Liège (2016)Detailed reference viewed: 14 (0 ULg) Art. Liège et la Guerre de Cent AnsMarchandisse, Alain in Moeglin, Jean-Marie (Ed.) Dictionnaire Guerre de Cent Ans (2016)Detailed reference viewed: 57 (1 ULg) SPICAM observations and modeling of Mars auroraeSoret, Lauriane ; Gérard, Jean-Claude ; Libert, Ludivine et alin Icarus (2016), 264Martian aurorae have been detected with the SPICAM instrument on board Mars Express both in the nadir and the limb viewing modes. In this study, we focus on three limb observations to determine both the ... [more ▼]Martian aurorae have been detected with the SPICAM instrument on board Mars Express both in the nadir and the limb viewing modes. In this study, we focus on three limb observations to determine both the altitudes and the intensities of the auroral emissions. The CO (a3P–X1R) Cameron bands between 190 and 270 nm, the CO Fourth Positive system (CO 4P) between 135 and 170 nm, the CO2+ doublet at 289 nm, the OI at 297.2 nm and the 130.4 nm OI triplet emissions have been identified in the spectra and in the time variations of the signals. The intensities of these auroral emissions have been quantified and the altitude of the strongest emission of the CO Cameron bands has been estimated to be 137 ± 27 km. The locations of these auroral events have also been determined and correspond to the statistical boundary of open-closed magnetic field lines, in cusp-like structures. The observed altitudes of the auroral emissions are reproduced by a Monte-Carlo model of electron transport in the Martian thermosphere for mono-energetic electrons between 40 and 200 eV. No correlation between electron fluxes measured in the upper thermosphere and nadir auroral intensity has been found. Here, we simulate auroral emissions observed both at the limb and at the nadir using electron energy spectra simultaneously measured with the ASPERA-3/ELS instrument. The simulated altitudes are in very good agreement with the observations. We find that predicted vertically integrated intensities for the various auroral emissions are overestimated, probably as a consequence of the inclination and curvature of the magnetic field line threading the aurora. However, the relative brightness of the CO and CO2+ emissions is in good agreement with the observations. [less ▲]Detailed reference viewed: 39 (12 ULg) Bi-objective Road and Pipe Network Design for Crude Oil Transport in the Sfax Region in TunisiaBelaid, Emna ; Limbourg, Sabine ; Mostert, Martine et alin Procedia Engineering (2016), 142In this paper, we examine a bi-objective road and pipe network design for crude oil transport in the Sfax region in Tunisia. In particular, we search for the minimum spanning trees (MST) that connect the ... [more ▼]In this paper, we examine a bi-objective road and pipe network design for crude oil transport in the Sfax region in Tunisia. In particular, we search for the minimum spanning trees (MST) that connect the different oil fields with the port of La Skhirra. In the determination of the minimum spanning trees, two objectives are taken into account, i.e. accident risk and construction costs. By using an improved ɛ-constraint resolution technique, the Pareto optimal combinations of risk and cost are found. Results indicate that the network solutions by pipe outperform the solutions by road. When the minimum spanning trees for the two extremes on the Pareto curves, i.e. the cost minimum and risk minimum, are compared, one could note considerable differences in the links that form the MST. This implies that policy makers have an important role in deliberating between costs and risks. [less ▲]Detailed reference viewed: 34 (6 ULg) L’impact des activités non agricoles sur la pauvreté et l’inégalité rurales dans les groupements Bugorhe et Irhambi-Katana (Territoire de Kabare, Province du Sud-Kivu)Furaha Mirindi, Germaine ; Namegabe Mastaki, Jean Luc; Lebailly, Philippe in JOURNAL OF ORIENTAL AND AFRICAN STUDIES (2016), 25Using a survey on the socio-economic situation of households in 2012, the study analyses the effect of non farm income on inequality and poverty alleviation in a rural area of the Democratic Republic of ... [more ▼]Using a survey on the socio-economic situation of households in 2012, the study analyses the effect of non farm income on inequality and poverty alleviation in a rural area of the Democratic Republic of Congo, by comparing a group of households practicing agriculture only and another group which combines agriculture and nonfarm activities. The approach used considers non farm income as an exogenous transfer which completes the whole household income, and analyses the contribution of different sources of income on the inequality in using the Gini index. The results show that inequality increases when a segment of the population does not have access to non-agricultural income. In this case, non farm income is not a substitute of farm income, rather the complement. The poverty analysis is based on the Congolese rural threshold poverty in terms of basic needs to calculate the rate, depth and severity of poverty indexes in using of Foster- Greer-Thorbecke. The results show that households practicing agriculture only are poorer. [less ▲]Detailed reference viewed: 40 (6 ULg) Free public transport: A socio-cognitive analysisCools, Mario ; Fabbro, Yannick; Bellemans, Tomin Transportation Research. Part A : Policy & Practice (2016), 86In this study, the modal shift potential of introducing a free alternative (free public transportation) and of changing the relative prices of transportation is examined. The influence of a cognitive ... [more ▼]In this study, the modal shift potential of introducing a free alternative (free public transportation) and of changing the relative prices of transportation is examined. The influence of a cognitive analysis on the zero-price effect is also analyzed. The data used for the analysis stem from a stated preference survey with a sample of approximately 670 respondents that was conducted in Flanders, Belgium. The data are analyzed using a mixed logit model. The modeling results yield findings that confirm the existence of a zero-price effect in transport, which is in line with the literature. This zero-price effect is increased by the forced cognitive analysis for shopping trips, although not for work/school or recreational trips. The results also demonstrate the importance of the current mode choice in hypothetical mode choices and the importance of car availability. The influence of changing relative prices on the modal shift is found to be insignificant. This might be partially because the price differences were too small to matter. Hence, an increase in public transport use can be facilitated by the introduction of free public transport, particularly when individuals evaluate the different alternatives in a more cognitive manner. These findings should be useful to policy makers evaluating free public transport and considering how best to target and promote relevant policy. [less ▲]Detailed reference viewed: 15 (1 ULg) Myoferlin plays a key role in VEGFA secretion and impacts tumor-associated angiogenesis in human pancreas cancerFahmy, Karim ; Gonzalez, Arnaud; Arafa, Mohammad et alin International Journal of Cancer = Journal International du Cancer (2016), 138Pancreatic ductal adenocarcinoma is one of the most deadly forms of cancers with no satisfactory treatment to date. Recent studies have identified myoferlin, a ferlin family member, in human pancreas ... [more ▼]Pancreatic ductal adenocarcinoma is one of the most deadly forms of cancers with no satisfactory treatment to date. Recent studies have identified myoferlin, a ferlin family member, in human pancreas adenocarcinoma where its expression was associated to a bad prognosis. However, the function of myoferlin in pancreas adenocarcinoma has not been reported. In other cell types, myoferlin is involved in several key plasma membrane processes such as fusion, repair, endocytosis and tyrosine kinase receptor activity. In this study, we showed that myoferlin silencing in BxPC-3 human pancreatic cancer cells resulted in the inhibition of cell proliferation in vitro and in a significant reduction of the tumor volume in chick chorioallantoic membrane assay. In addition to be smaller, the tumors formed by the myoferlin-silenced cells showed a marked absence of functional blood vessels. We further demonstrated that this effect was due, at least in part, to an inhibition of VEGFA secretion by BxPC-3 myoferlin-silenced cells. Using immunofluorescence and electron microscopy, we linked the decreased VEGFA secretion to an impairment of VEGFA exocytosis. The clinical relevance of our results was further strengthened by a significant correlation between myoferlin expression in a series of human pancreatic malignant lesions and their angiogenic status evaluated by the determination of the blood vessel density. [less ▲]Detailed reference viewed: 95 (27 ULg) Alexander Kluge et le cinéma de l'indécision.Cormann, Grégory ; Hamers, Jérémy Book published by Presses Universitaires de Liège (2016)Detailed reference viewed: 52 (5 ULg) Sartre in Venedig: der Mann, der in die Kälte gingCormann, Grégory ; Viehöver, Vera in Bulletin d'Analyse Phénoménologique (2016), 11Detailed reference viewed: 37 (3 ULg) "Après-coup : terrifiante euphorie d’entendre quelque chose" (U. Meinhof). Histoire et expériences de privation sensorielleHamers, Jérémy ; Cormann, Grégory in Actes des journées Cultures sensibles 2012 (2016)Detailed reference viewed: 49 (9 ULg) "Des muets qui veulent parler". Lectures politiques, des Temps Modernes à L'Idiot de la familleCormann, Grégory in Bolmain, Thomas; Cormann, Grégory (Eds.) Politiques de la littérature. Bourdieu, Sartre, Foucault (2016)Detailed reference viewed: 34 (2 ULg) Sartre, les passions de la liberté. Phénoménologie, politique, savoirs critiquesCormann, Grégory Book published by Peter Lang (2016)Detailed reference viewed: 143 (17 ULg) Pour une pensée politique des émotions : Kluge et Ferenczi dans Die Macht der GefühleCormann, Grégory ; Hamers, Jérémy in Caeymaex, Florence; Goddard, Jean-Christophe (Eds.) Critiques en crise. Enjeux et significations de la critique aujourd'hui (2016)Detailed reference viewed: 17 (3 ULg) Doped sol–gel films vs. powders TiO2: On the positive effect induced by the presence of a substrateLéonard, Géraldine ; Malengreaux, Charline; Melotte, Quentin et alin Journal of Environmental Chemical Engineering (2016), 4SiO2 and Ag–SiO2 doped TiO2 films and powders have been produced using a controlled sol–gel process. The dopant has been introduced using an alkoxysilane-functionalized ligand, with or without complexed ... [more ▼]SiO2 and Ag–SiO2 doped TiO2 films and powders have been produced using a controlled sol–gel process. The dopant has been introduced using an alkoxysilane-functionalized ligand, with or without complexed silver ions. The influence of dopants on physico-chemical properties of the catalysts is studied by XRD, TEM–EDX, DRUV–vis analyses in the case of powders, while GIXRD, XPS, profilometry, UV–vis absorption analyses have been used for thin films. The photocatalytic activity has been evaluated from the degradation of methylene blue under UV-A light in the presence of the different catalysts over a period of 24 h. The detailed comparison between powders and films highlights a surprising positive effect in the case of films due to the presence of the substrate. In the case of photocatalytic powders, the presence of SiO2 or Ag–SiO2 into the TiO2 matrix has a detrimental effect on the photocatalytic activity while the opposite tendency is observed in the case of films, with best activities obtained with Ag–SiO2 doping. Different factors, in particular crystallinity modification between powders and films, have been studied to explain these opposite behaviors. In the case of powders, crystallization is hindered by SiO2 and Ag particles incorporation into the TiO2 matrix, leading to a decrease of the photocatalytic activity. In the case of thin films, probably because of the presence of a substrate, crystallization is not influenced by the presence of SiO2 and Ag particles. Therefore, the latter ones can fully play their role of electron traps leading to an enhanced photocatalytic activity. [less ▲]Detailed reference viewed: 44 (10 ULg) Reassessment of the acrylamide risk: Belgium as a case-studyClaes, Wendie; De Meulenaer, Bruno; Huyghebaert, André et alin Food Control (2016), 59Acrylamide is a food process contaminant with carcinogenic and genotoxic properties. As a result of intensive research, numerous mitigation initiatives to prevent its formation were suggested and various ... [more ▼]Acrylamide is a food process contaminant with carcinogenic and genotoxic properties. As a result of intensive research, numerous mitigation initiatives to prevent its formation were suggested and various of them were implemented in the food chain. To evaluate if the mitigation strategies applied were significant, a comparison was made between two time periods (2002e2007 versus 2008e2013) in terms of acrylamide food levels and dietary exposure in Belgian. The most important changes observed are a significant decrease of the acrylamide content in potato crisps and gingerbread, and a significant increase in (instant) coffee. Additionally, the acrylamide content of breakfast cereals, bread and rolls, chocolate and baby biscuits showed a downward trend, whereas for coffee substitute and ready-to-eat French fries (mainly obtained from catering facilities), an upward, although not significant, trend was observed. These changes resulted in only a slight, but insignificant decline of the overall dietary exposure of adults, adolescents and children. The mean and P95 intake estimated in the 2008e2013 period for these consumer groups corresponded to margins of exposure (MOE) ranging between 515 and 236 and between 155 and 71, respectively, when based on the endpoint for neoplastic effects (BMDL10 ¼ 0.17 mg/kg bw per day). Such low MOE values indicate that acrylamide remains an issue for public concern, requiring renewed attention. [less ▲]Detailed reference viewed: 40 (3 ULg) Logistics Service Quality: The Case of Da Nang CityLimbourg, Sabine ; Giang, Ho Thi Quynh; Cools, Mario in Procedia Engineering (2016), 142Cost minimization is a key objective in managing logistics services. In this context, a growing interest in quality improvement can be observed. However, service quality is hard to quantify as it is a ... [more ▼]Cost minimization is a key objective in managing logistics services. In this context, a growing interest in quality improvement can be observed. However, service quality is hard to quantify as it is a function of varying customer perceptions over time, of the measurement process and of the analysis of the data gathered. This study examines the logistics service quality by scales developed according to SERVQUAL instrument. A survey of 200 customers of logistics service providers (LSP) was conducted in Da Nang City. The data analysis shows that LSPs in Da Nang city need to improve Research and Development and to develop Customer Care programs. [less ▲]Detailed reference viewed: 14 (1 ULg) Simultaneous multi-scale and multi-instrument observations of Saturn's aurorae during the 2013 observing campaignMelin, H.; Badman, S.; Stallard, T. et alin Icarus (2016)Detailed reference viewed: 7 (0 ULg) Is system resilience maintained at the expense of individual resilience?Nyssen, Anne-Sophie ; Berastegui, Pierre in Braithwaite, Jeffrey; Wears, Robert; Hollnagel, Erik (Eds.) Resilient Health Care III: Reconciling Work-As-Imagined and Work-As-Done (2016)Detailed reference viewed: 32 (6 ULg)