Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailPd-Ag/SiO2 and Pd-Cu/SiO2 cogelled xerogel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene
Lambert, Stéphanie ULg; Ferauche, Fabrice; Brasseur, Alain et al

in Catalysis Today (2005), 100(3-4), 283-289

While 1,2-dichloroethane hydrodechlorination over pure palladium mainly produces ethane, increasing silver or copper content in bimetallic catalysts results in an increase in ethylene selectivity. The ... [more ▼]

While 1,2-dichloroethane hydrodechlorination over pure palladium mainly produces ethane, increasing silver or copper content in bimetallic catalysts results in an increase in ethylene selectivity. The specific consumption rate of 1,2-dichloroethane decreases when silver or copper loading increases. The turnover frequency, that is, the number of catalytic cycle per active site (palladium atom and its surrounding silver or copper atoms) and per second, seems to be independent of surface composition of alloy particles and 1,2-dichloroethane hydrodechlorination is insensitive to the atom's nature (silver or copper). (c) 2004 Elsevier B.V. All rights reserved. [less ▲]

Detailed reference viewed: 26 (5 ULg)
Peer Reviewed
See detailPd-Ag/SiO2 and Pd-Cu/SiO2 cogelled xerogel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene
Lambert, Stéphanie ULg; Ferauche, Fabrice; Brasseur, Alain et al

Conference (2004)

Detailed reference viewed: 21 (1 ULg)
Full Text
Peer Reviewed
See detailPd-Ag/SiO2 sol-gel catalysts designed for selective conversion of chlorinated alkanes into alkenes
Heinrichs, Benoît ULg; Delhez, Patrice; Schoebrechts, Jean-Paul et al

in Studies in Surface Science and Catalysis (1998), 118

Detailed reference viewed: 13 (2 ULg)
Peer Reviewed
See detailPd-Ag/SiO2 sol-gel catalysts designed for selective conversion of chlorinated alkanes into alkenes
Heinrichs, Benoît ULg; Delhez, Patrice; Schoebrechts, Jean-Paul et al

Conference (1998)

Detailed reference viewed: 5 (0 ULg)
See detailPd-Ag/SiO2 sol-gel catalysts for selective hydrodechlorination of 1,2-dichloroethane into ethylene
Heinrichs, Benoît ULg

Scientific conference (2002, December 03)

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailPd-Ag/SiO2 xerogel catalyst forming by impregnation on alumina foams
Alié, Christelle ULg; Ferauche, Fabrice; Léonard, Angélique ULg et al

in Chemical Engineering Journal (2006), 117(1), 13-22

A Pd-Ag/SiO2 xerogel catalyst prepared in one step by sol-gel process has been entrapped in cylindrical porous alumina foams of three different pore sizes in order to shape the catalyst under the ... [more ▼]

A Pd-Ag/SiO2 xerogel catalyst prepared in one step by sol-gel process has been entrapped in cylindrical porous alumina foams of three different pore sizes in order to shape the catalyst under the appropriate form with suitable mechanical resistance to be used in an industrial fixed bed reactor. After drying, calcination and reduction, the Pd-Ag/SiO2 xerogel catalyst pellets are immobilized inside the open porosity of the alumina foam. The localization of the xerogel catalyst in the alumina foams has been studied by X-ray tomography. The three-dimensional porous structure was reconstructed from the consecutive cross-sections obtained by this technique. This method shows that the Pd-Ag/SiO2 xerogel catalyst is uniformly dispersed inside the porosity of the alumina foams. Activity and selectivity of Pd-Ag/SiO2 xerogel catalyst reference or catalyst entrapped in alumina foams have been studied for selective hydrodechlorination of 1,2-dichloroethane into ethylene. The specific reaction rate obtained with catalyst entrapped in alumina foams is smaller than the one obtained from corresponding catalyst powders. The catalytic activity decrease observed for Pd-Ag/SiO2 xerogel catalyst entrapped in porous alumina foams most probably arises from diffusional limitations inside the porous texture of the alumina foams. (c) 2005 Elsevier B.V. All rights reserved. [less ▲]

Detailed reference viewed: 72 (6 ULg)
Full Text
Peer Reviewed
See detailPd/SiO2-cogelled aerogel catalysts and impregnated aerogel and xerogel catalysts: Synthesis and characterization
Heinrichs, Benoît ULg; Noville, Francis ULg; Pirard, Jean-Paul ULg

in Journal of Catalysis (1997), 170(2), 366-376

Pd/SiO2 aerogel catalysts have been synthesized by cogelation of tetraethoxysilane with complex Pd2+[NH2-CH2-CH2-NH-(CH2)(3)-Si(OCH3)(3)](2) containing a hydrolysable silyl group. Pd catalysts have also ... [more ▼]

Pd/SiO2 aerogel catalysts have been synthesized by cogelation of tetraethoxysilane with complex Pd2+[NH2-CH2-CH2-NH-(CH2)(3)-Si(OCH3)(3)](2) containing a hydrolysable silyl group. Pd catalysts have also been prepared by impregnation of silica aerogels and xerogels with solutions of this complex or Pd2+(NH3)(4) followed by drying under hypercritical conditions or under vacuum. It appears that, in cogelled samples, the Pd2+ complex acts as a nucleation agent in the formation of silica particles. The resulting catalysts are then composed of completely accessible palladium crystallites with a diameter of about 2.3 nm located inside silica particles with a monodisperse microporous distribution centered on a hydraulic radius of 0.43 nm. The continuous meso- and macropore distribution is located in voids between particles and between aggregates constituted of those particles. In impregnated samples, it appears that Pd particles are located outside SiO2 particles. The relation between the texture of cogelled and impregnated catalysts and their behavior toward sintering has been studied in detail. In cogelled samples, it has been shown that Pd crystallites cannot migrate because they are trapped in the pores of SiO2 particles. These catalysts are sinterproof during hypercritical drying, When Pd crystallites are not trapped inside SiO2 particles, hypercritical drying leads to an extensive sintering of metal particles. During calcination of impregnated catalysts dried under vacuum, sintering occurs to a various extent depending on the support texture. The Pd crystallites size decreases when the pore size distribution is shifted toward the small sizes. (C) 1997 Academic Press. [less ▲]

Detailed reference viewed: 55 (17 ULg)
Full Text
Peer Reviewed
See detailA PDE viewpoint on basic properties of coordination algorithms with symmetries
Sarlette, Alain ULg; Sepulchre, Rodolphe ULg

in Proceedings of the 48th IEEE Conference on Decision and Control (2009, December)

Several recent control applications consider the coordination of subsystems through local interaction. Often the interaction has a symmetry in state space, e.g. invariance with respect to a uniform ... [more ▼]

Several recent control applications consider the coordination of subsystems through local interaction. Often the interaction has a symmetry in state space, e.g. invariance with respect to a uniform translation of all subsystem values. The present paper shows that in presence of such symmetry, fundamental properties can be highlighted by viewing the distributed system as the discrete approximation of a partial differential equation. An important fact is that the symmetry on the state space differs from the popular spatial invariance property, which is not necessary for the present results. The relevance of the viewpoint is illustrated on two examples: (i) ill-conditioning of interaction matrices in coordination/consensus problems and (ii) the string instability issue. [less ▲]

Detailed reference viewed: 21 (4 ULg)
Full Text
Peer Reviewed
See detailPDX:PBX complexes are required for normal proliferation of pancreatic cells during development.
Dutta, S.; Gannon, M.; Peers, Bernard ULg et al

in Proceedings of the National Academy of Sciences of the United States of America (2001), 98(3), 1065-70

The homeobox factor PDX-1 is a key regulator of pancreatic morphogenesis and glucose homeostasis; targeted disruption of the PDX-1 gene leads to pancreatic agenesis in pdx-1(-/-) homozygotes. Pdx-1 ... [more ▼]

The homeobox factor PDX-1 is a key regulator of pancreatic morphogenesis and glucose homeostasis; targeted disruption of the PDX-1 gene leads to pancreatic agenesis in pdx-1(-/-) homozygotes. Pdx-1 heterozygotes develop normally, but they display glucose intolerance in adulthood. Like certain other homeobox proteins, PDX-1 contains a consensus FPWMK motif that promotes heterodimer formation with the ubiquitous homeodomain protein PBX. To evaluate the importance of PDX-1:PBX complexes in pancreatic morphogenesis and glucose homeostasis, we expressed either wild-type or PBX interaction defective PDX-1 transgenes under control of the PDX-1 promoter. Both wild-type and mutant PDX-1 transgenes corrected glucose intolerance in pdx-1 heterozygotes. The wild-type PDX-1 transgene rescued the development of all pancreatic lineages in pdx-1(-/-) animals, and these mice survived to adulthood. In contrast, pancreata from pdx-1(-/-) mice expressing the mutant PDX-1 transgene were hypoplastic, and these mice died within 3 weeks of birth from pancreatic insufficiency. All pancreatic cell types were observed in pdx-1(-/-) mice expressing the mutant PDX-1 transgene; but the islets were smaller, and increased numbers of islet hormone-positive cells were noted within the ductal epithelium. These results indicate that PDX-1:PBX complexes are dispensable for glucose homeostasis and for differentiation of stem cells into ductal, endocrine, and acinar lineages; but they are essential for expansion of these populations during development. [less ▲]

Detailed reference viewed: 22 (2 ULg)
Full Text
See detailPE teachers’ competencies: which ones are considered as the most important and where are they acquired?
Cloes, Marc ULg; Laraki, Nadine; Piéron, Maurice

Poster (2004, August)

It is well accepted that teacher prepration is a long term process during which a large array of competencies are progressively developed. Since 2001, in the French Community of Belgium, a decree lists ... [more ▼]

It is well accepted that teacher prepration is a long term process during which a large array of competencies are progressively developed. Since 2001, in the French Community of Belgium, a decree lists the competencies that teachers should develop to achieve their role within the educational system. This study aimed to identify competencies taht PE teachers consider as important and to determine, from their point of view, in which context these competencies are developed. [less ▲]

Detailed reference viewed: 24 (2 ULg)
Full Text
Peer Reviewed
See detailPeach latent mosaic viroid detected for the firts time on almond trees in Tunisia
Fekih Hassen, I.; Roussel, S.; Kummert, J. et al

in Plant Disease (2005), 89

Detailed reference viewed: 4 (0 ULg)
Full Text
Peer Reviewed
See detailPearls and pitfalls: Electrophysiology for primary headaches
MAGIS, Delphine ULg; Vigano, Alessandro; SAVA, Simona Liliana ULg et al

in Cephalalgia : An International Journal of Headache (2013)

Detailed reference viewed: 40 (5 ULg)
Full Text
See detailPeasant responses to agricultural land conversion and mechanism of rural social differentiation in Hung Yen province, Northern Vietnam
Nguyen Thi, Dien; Vu Dinh, Ton; Lebailly, Philippe ULg

Conference (2011)

Agricultural accumulation has been one of the main source determined the social differentiation in Vietnamese countryside. The complexities of agrarian changes under the post - socialist industrialization ... [more ▼]

Agricultural accumulation has been one of the main source determined the social differentiation in Vietnamese countryside. The complexities of agrarian changes under the post - socialist industrialization with high rate of agricultural land conversion in recent context reveal the new forms of capital accumulation and social differentiation. This research investigates how land conversion process to industrial zones and clusters affected to the way that different groups of peasant households accumulate their resources. The study was carried out in 3 districts of Hung Yen province from 2006 to 2010. The study results are as follows: first, the land conversion to industrialization has impact on not only the decline of household landholdings but also the changes value of land which are the sources of social conflicts and informal land transfer. Second, in the context of land conversion to industrialization with tiny plots of land, low return from agricultural production and more opportunities of non-farm activities, even when non-farm employment is very profitable, peasant households are not likely to give up their land but maintaining agricultural production for not only their basic and secure livelihood but also for their identity. Third, among the affected peasant groups, the households with non-farm background tend to be in better position in engaging to high - earning activities. They are likely the rich peasants in opposed to the poor group with farming background and lost more than 50% of their agricultural land. This research has showed that the industrialization policies have to deal with the proportion of agricultural land would be transferred for industrialization zones and other measures in order to limit the conflicts as well as the social differentiation in countryside. [less ▲]

Detailed reference viewed: 59 (6 ULg)
Full Text
Peer Reviewed
See detailThe peasants in turmoil: Khmer Rouge, state formation and the control of land in northwest Cambodia
Diepart, Jean-Christophe ULg; Dupuis, David

in The Journal of Peasant Studies (2014), 41(4), 445468

Over the past 15 years, northwest Cambodia has seen dramatic agrarian expansion away from the central rice plain into the peripheral uplands fuelled by peasant in-migration. Against this background, we ... [more ▼]

Over the past 15 years, northwest Cambodia has seen dramatic agrarian expansion away from the central rice plain into the peripheral uplands fuelled by peasant in-migration. Against this background, we examine the nature of relations between the peasantry and the state. We first show the historical continuities of land control processes and how the use of violence in a post-conflict neoliberal context has legitimised ex-Khmer Rouge in controlling land distribution. Three case studies show the heterogeneity of local level sovereignties, which engage the peasants in different relations with authority. We examine how these processes result in the construction of different rural territories along the agricultural frontier and argue that, in this region of Cambodia, the struggles between Khmer Rouge and neoliberal modes of land control are central to state formation processes. [less ▲]

Detailed reference viewed: 10 (1 ULg)
Peer Reviewed
See detailPeatlands of Wallony (S-Belgium)
Frankard, Philippe; Ghiette, Pascal; Hindryckx, Marie-Noëlle ULg et al

in Suoseura - Finnish Peatland Society (1998), 49(2), 33-47

Various types of peatlands are present in Wallony: raised bogs, oligotrophic and rich fens, wet heaths, marshy woodlands. Many areas have been degraded by past and recent human activities. Much attention ... [more ▼]

Various types of peatlands are present in Wallony: raised bogs, oligotrophic and rich fens, wet heaths, marshy woodlands. Many areas have been degraded by past and recent human activities. Much attention is now devoted to their protection, scientific study and ecological management. Besides their exceptional biological and ecological interest, they are among the last natural spaces in a very urbanised country like Belgium. [less ▲]

Detailed reference viewed: 100 (15 ULg)
See detailLa peau : miroir de la santé
Peeters, Dominique ULg; Remy, Isabelle

in Proceedings of "Congrès SAVAB" (2006, February)

Detailed reference viewed: 17 (1 ULg)
Full Text
See detailLa peau de l'acromégale.
Hermanns-Le, Trinh ULg; QUATRESOOZ, Pascale ULg; Arrese Estrada, Jorge ULg et al

in Dermatologie Actualité (2003), 75

L'acromégalie est l'expression clinique d'une hypersécrétion chronique de l'hormone de croissance dont la source est, dans la plupart des cas, un adénome hypophysaire. Son diagnostic est souvent posé ... [more ▼]

L'acromégalie est l'expression clinique d'une hypersécrétion chronique de l'hormone de croissance dont la source est, dans la plupart des cas, un adénome hypophysaire. Son diagnostic est souvent posé tardivement, car les signes cliniques se développent de façon insidieuse. [less ▲]

Detailed reference viewed: 7 (2 ULg)