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
See detailRecent results on the hierarchical triple system HD 150136
Gosset, Eric ULg; Berger, J. P.; Absil, Olivier ULg et al

in Bonanos, Alceste (Ed.) Massive Stars: From alpha to Omega (2013, June 01)

HD 150136 is a hierarchical triple system, non-thermal radio emitter, made of three O stars totalling some 130 solar masses. The 2.67-day inner orbit is rather well-known. Recent works derived a good ... [more ▼]

HD 150136 is a hierarchical triple system, non-thermal radio emitter, made of three O stars totalling some 130 solar masses. The 2.67-day inner orbit is rather well-known. Recent works derived a good approximation for the outer orbit with a period of 3000 days. We report here on interferometric observations that allow us to angularly resolve the outer orbit. First evidences for an astrometric displacement are given. The determination of the outer system orbit gives access to the inclinations of the systems and to the masses, including the one of the O3-O3.5 primary star. [less ▲]

Detailed reference viewed: 17 (7 ULg)
See detailRecent results on the Jovian satellite footprints
Bonfond, Bertrand ULg

Scientific conference (2010, April 21)

Detailed reference viewed: 4 (1 ULg)
See detailRecent state of the Aral sea from regular satellite observations. 35th COSPAR Scientific Assembly
Stanichny, Sergey ULg; Davidov, A.; Djenidi, Salim ULg et al

in 35th COSPAR Scientific Assembly (2004)

The Aral Sea disaster is one of the most significant examples of ecological catastrophe caused by mismanagement of water resources. Aral sea level dropped on 22 meters for the last 35 years. The sea ... [more ▼]

The Aral Sea disaster is one of the most significant examples of ecological catastrophe caused by mismanagement of water resources. Aral sea level dropped on 22 meters for the last 35 years. The sea separated in to two independent parts , the Large Sea(Southern) and the Small Sea (Northern), loosing more than 90% of its original water masses. After the collapse of the former Soviet Union, satellite retrieved data became the main source of information on this perishing system. Regular observations from AVHRR, SeaWiFS, MODIS and ASTER satellite sensors were used for our investigations. Sea surface temperature (SST) data of the AVHRR sensor and digital bottom map topography were used for sea level drop calculations. The Sea level defined as the digital map isobate corresponds quite well to the satellite derived coastline for the Eastern part of the Large Sea with a bottom slope of ˜ 0.00015. For the period 1989-2002 the sea level of the Large Sea dropped on 9.2 meters. However in 2003 the sea level remained stable. This stabilisation was due to an increase of water output of the rivers Amu--Darya and Syr-Darya in 2003. High resolution ASTER data showed that the main amount of Syr-Darya waters is discharged into the Large Sea. The dried bottom area now covers more than 45000 km2. On the base of AVHRR-SST data the temperature regime for different parts of the Aral Sea was calculated for the years 2002-2003. The annual amplitude of the SST variation reaches 37° C for the open waters. The observed minimum freezing point was -7° C due to very high salinity. Estimations from satellite retrieved freezing points show an increase of salinity up to 10% in the Eastern part of the Large Sea. It is almost paradox that on satellite images the ice appears warmer than the water. Strong variations of the water temperature (up to 5° C) within a few days could be observed from April to August and could be related to wind induced mixing. SeaWiFS ocean colour data were used for the investigation of the optical properties of the water in different parts of the Aral Sea for the years 2002-2003. A significant relation of optical properties with wind and temperature was obtained. Strong changes of the thermal regimes of the Sea can cause variations in local climatic conditions: The analysis of AVHRR NDVI - data for the surrounding areas demonstrated a shift in the annual vegetation cycle. In addition phenomena like: salt storms, wind driven tides, sources of groundwater, eddies and frontal structures as well as ice coverage of the Aral Sea were demonstrated on satellite images. [less ▲]

Detailed reference viewed: 5 (0 ULg)
Full Text
See detailRecent strategies and advances in controlled radical polymerization of vinyl monomers
Detrembleur, Christophe ULg

Thèse d’agrégation de l’enseignement supérieur (2007)

Detailed reference viewed: 13 (3 ULg)
Full Text
See detailRECENT STUDIES CONDUCTED AT LIEGE UNIVERSITY IN THE FIELD OF COMPOSITE CONSTRUCTION
Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg

Report (2009)

The present informal document summarises recent or ongoing studies conducted at Liège University in the field of steel-concrete composite constructions; they are summarised in a Table presented at the ... [more ▼]

The present informal document summarises recent or ongoing studies conducted at Liège University in the field of steel-concrete composite constructions; they are summarised in a Table presented at the following page. Only the main results are presented herein. For all the addressed topics, references to documents, reports and articles where details are available will be made; a copy of these documents can be obtained by contacting us. At the end of each paragraph, a section dedicated to some perspectives is given. § 9.2 summarises the main topics in which investigations could be conducted in the future; these perspectives are also reported in the Table here after. The activities related to the response of composite structures subjected to seismic or fire actions (mainly covered in Liège by Prof. Plumier and Prof. Franssen respectively) are not reported here as they are covered by other more “transversal” technical committees of ECCS (TC3 for the fire and TC13 for the seismic action). The “composite joints” topic is included here even if a technical committee relative to the behaviour of joints exists within ECCS (TC10); indeed, in the past, all the developments relative to composite joints were discussed and accepted within TC11 and not within TC10. Of course, it is up to the present TC11 members to decide whether this topic has or not to be considered within TC11. Finally, the robustness of composite structures and in particular, the robustness of the structures subjected to the exceptional event “loss of a column further” is also considered herein as this topic is not yet covered by any other technical committee. Again, it is up to the TC11 members to decide whether this topic has to be discussed within TC11. [less ▲]

Detailed reference viewed: 18 (1 ULg)
Full Text
Peer Reviewed
See detailRecent threats on coastal ecosystems by new pollutants: a multiple trace element study
Richir, Jonathan ULg; Gobert, Sylvie ULg; Bouquegneau, Jean-Marie ULg

Poster (2009, January)

The Mediterranean Sea is an enclosed basin, highly submitted to anthropogenic pressures. Chemical pollution from coastal urban centres and industries, or carried by air and rivers, primarily affects its ... [more ▼]

The Mediterranean Sea is an enclosed basin, highly submitted to anthropogenic pressures. Chemical pollution from coastal urban centres and industries, or carried by air and rivers, primarily affects its coastal ecosystems. Pollution by trace elements is rapidly evolving further to the recent modifications of their production and industrial uses by men. As a result, certain trace elements can now be considered as new environmental pollutants. Appropriate bioindicators are useful tools for the early warning of marine pollution. We presently investigate the use of the purple sea urchin Paracentrotus lividus and the marine phanerogam Posidonia oceanica as bioindicators to monitor the Mediterranean coastal pollution by new trace pollutants (Be, V, Mo, Mn, PGEs, Ag, Al, As, Se, Sb and Bi). Classic trace metals (Cd, Cr, Cu, Zn, Ni, Sn, Pb, Co and Fe) are also studied. Organisms were seasonally collected in 2008 in a reference site and a polluted one, respectively Calvi bay (Corsica) and Marseille (France). Their tissular trace element concentrations were determined by ICP-MS. All the investigated trace elements were chosen for their potential toxic effects. [less ▲]

Detailed reference viewed: 86 (18 ULg)
Full Text
Peer Reviewed
See detailRecent trend anomaly of hydrogen chloride (HCl) at northern mid-latitudes derived from Jungfraujoch, HALOE and ACE-FTS Infrared solar observations
Mahieu, Emmanuel ULg; Zander, Rodolphe ULg; Bernath, Peter F. et al

in Bernath, Peter F. (Ed.) The Atmospheric Chemistry Experiment ACE at 10: A Solar Occultation Anthology (2013)

In this contribution, we analyze infrared solar observations recorded from the ground at the Jungfraujoch station and from space with the HALOE and the ACE-FTS instruments to derive time series of ... [more ▼]

In this contribution, we analyze infrared solar observations recorded from the ground at the Jungfraujoch station and from space with the HALOE and the ACE-FTS instruments to derive time series of stratospheric columns of hydrogen chloride (HCl) at Northern mid-latitudes. We investigate the Jungfraujoch and the composite satellite time series to characterize the evolution of HCl over the last 15 years, i.e. after its peak loading which occurred in 1996 in this region of the Earth’s atmosphere. Trends derived from both data sets are compared and possible causes for the recent change in the stratospheric HCl buildup are evoked. [less ▲]

Detailed reference viewed: 27 (4 ULg)
Full Text
Peer Reviewed
See detailRecent trends in Cys- and Ser/Thr-based chemical ligations for the elaboration of peptide constructs
Monbaliu, Jean-Christophe ULg; Katritzky, Alan

in Chemical Communications (2012), 48

Detailed reference viewed: 8 (3 ULg)
Full Text
Peer Reviewed
See detailRECENT TRENDS IN HOT STRIP ROUGHING MILLS: HIGH CHROMIUM STEEL VERSUS SEMI-HSS
Lecomte-Beckers, Jacqueline ULg; Tchuindjang, Jérôme Tchoufack ULg; Sinnaeve, Mario et al

in Procceedings of the 47th Rolling Seminar - Processes, Rolled and Coated Products (2010, October)

compared. The first grade known as High Chromium Steel (HCS) is presently the most widely used alloy for such an application, while the second one known as semi-High Speed Steel (semi-HSS) is the new ... [more ▼]

compared. The first grade known as High Chromium Steel (HCS) is presently the most widely used alloy for such an application, while the second one known as semi-High Speed Steel (semi-HSS) is the new grade developed to improve the overall performance of the work roll in the roughing stands of the HSM. In the present paper, the new semi-HSS grade is studied starting from three chemical compositions closed one to another, the variation in the alloying elements is intended to assess, on one hand the effect of a small increase of the carbon content, and on the other hand the influence of the addition of a strong MC carbide forming element. Furthermore, corrosion behavior and performances of the work rolls in service are compared. Various techniques are used in order to characterize both grades, such as Differential Thermal Analysis (to determine phase transformations temperatures, the crystallization behavior and the interval of solidification), hardness measurements, optical microscopy, scanning electron microscopy associated with energy dispersive X ray spectroscopy (to determine the nature and the composition of phases, especially matrix and carbides). Finally micro-macro relations between the nature of the microstructure and the properties of High Chromium Steel and semi-HSS rolls grades in service conditions could be established. [less ▲]

Detailed reference viewed: 44 (5 ULg)
Full Text
Peer Reviewed
See detailRecent Trends in Social Economy Research
Fecher-Bourgeois, Fabienne ULg; Chaves, Rafael; Monzon Campos, José Luis

in Annals of Public and Cooperative Economics = Annales de l'Economie Publique, Sociale et Coopérative (2012), 83(3), 251-433

Detailed reference viewed: 28 (11 ULg)
Full Text
Peer Reviewed
See detailRecent trends in specular light reflectance beyond clinical fluorescence diagnosis.
Szepetiuk, Gregory; Pierard, Sébastien ULg; PIERARD-FRANCHIMONT, Claudine ULg et al

in European Journal of Dermatology (2011), 21(2), 157-61

Under specific light illumination, particularly ultraviolet (UV) and near-UV light stimulation, the skin produces both specular light reflectance and, possibly, specific fluorescent emission. These ... [more ▼]

Under specific light illumination, particularly ultraviolet (UV) and near-UV light stimulation, the skin produces both specular light reflectance and, possibly, specific fluorescent emission. These properties offer diagnostic clues and disclose some peculiar functions of the skin. A series of superficial infections (erythrasma, some tinea capitis types, tinea/pityriasis versicolor, dermatophytoses, etc.) and pilosebaceous follicles enriched in Propionibacterium spp show fluorescence. This latter characteristic is downgraded or lost while on some anti-acne treatments. A quenching effect of fluorescence is observed following the application of sunscreens. The (pre)neoplastic areas prepared for methylaminolevulinate photodynamic therapy (MAL-PDT) show reddish fluorescence following drug metabolisation producing porphyrins by the abnormal activated cells. Of note, when using a recording sensitive CCD camera instead of casual visual observation, skin fluorescence may be superimposed on the specular reflectance of the incident light. With the current technology, these situations are not distinguished with confidence. Any harsh and scaly lesion appears brighter following yellowish specular light reflectance. Stratum corneum samplings collected on clear self-adhesive discs or cyanoacrylate skin surface strippings are conveniently examined ex vivo, taking advantage of the same optical properties. [less ▲]

Detailed reference viewed: 16 (0 ULg)
See detailRecent trends in the modelling of catalytic trickle-bed reactors
Crine, Michel ULg; L'Homme, Guy ULg

in Alper, E. (Ed.) Mass transfer with chemical reaction in multiphase systems. Volume II : Three phase systems (1983)

Detailed reference viewed: 8 (0 ULg)
Full Text
See detailRecent trends of inorganic chlorine and halogenated source gases above the Jungfraujoch and Kitt Peak stations derived from high-resolution FTIR solar observations
Mahieu, Emmanuel ULg; Rinsland, Curtis P.; Gardiner, Tom et al

in Geophysical Research Abstracts (2010), 12(EGU2010-2420-3),

The longest series of Fourier Transform Infrared (FTIR) high spectral resolution solar absorption observations are available from the Jungfraujoch and Kitt Peak stations, located at 46.5ºN and 30.9ºN ... [more ▼]

The longest series of Fourier Transform Infrared (FTIR) high spectral resolution solar absorption observations are available from the Jungfraujoch and Kitt Peak stations, located at 46.5ºN and 30.9ºN, respectively. State-of-the-art interferometers are operated at these sites within the framework of the Network for the Detection of Atmospheric Composition Change (NDACC, visit http://www.ndacc.org). These instruments allow to record spectra on a regular basis, under clear-sky conditions, using a suite of optical filters which altogether cover the 2 to 16 micron spectral range. Numerous absorption features characterized in the HITRAN compilations (e.g. Rothman et al., 2008) are encompassed in this mid-infrared region. Their analyses with either the SFIT-1 or SFIT-2 algorithm allow retrieving total columns of the target gases. Moreover, information on their distribution with altitude can generally be derived when using SFIT-2 which implements the Optimal Estimation Method of Rodgers (1990). Among the two dozen gases of atmospheric interest accessible to the ground-based FTIR technique, we have selected here a suite of long-lived halogenated species: HCl, ClONO2, CCl2F2, CCl3F, CHClF2, CCl4 and SF6. Time series available from the two sites will be presented, compared and critically discussed. In particular, changes in the abundances of theses gases since the peak in inorganic chlorine (Cly, which occurred in 1996-1997) and their intra-annual variability will be characterized with a statistical tool using bootstrap resampling (Gardiner et al., 2008). Trends and their associated uncertainties will be reported and put into perspective with the phase-out regulations of the production of ozone depleting substances adopted and implemented by the Montreal Protocol, its Amendments and Adjustments. For instance, the trends affecting the reservoir species HCl, ClONO2, and their summation which is a good proxy of the total inorganic chlorine, have been calculated using all available daily mean measurements from January 1996 onwards. The following values were obtained for Jungfraujoch, when using 1996 as the reference year: -0.90±0.10%/yr for HCl, -0.92±0.26 %/yr for ClONO2, and -0.96±0.14 %/yr for Cly; in all cases, the uncertainties define the 95% confidence interval around the trend values. For Kitt Peak, the corresponding trends are: -0.55±0.34 %/yr for HCl, -1.27±0.84 %/yr for ClONO2 and -0.61±0.51 %/yr for Cly, they are statistically consistent with the Jungfraujoch rates of decrease. Further trend data will be presented at the EGU General Assembly while supplementary information on Jungfraujoch results will be available from communications at the same meeting by Duchatelet et al. (2010), Lejeune et al (2010) and Rinsland et al (2010). Comparisons with model data are also foreseen. [less ▲]

Detailed reference viewed: 48 (19 ULg)
Full Text
Peer Reviewed
See detailRecently advanced computerized technology was applied to the investigation of morphometric, immunohistological and three-dimensional changes of the endometrial mucosa in order to evaluate quantitatively the effects of three doses of a new slow-release vaginal progesterone on the endometrium in post-menopausal women. A total of 20 menopausal women, deprived of ovarian function, were given oestrogen for 12 days and a combined therapy of oestrogen (administered orally) and progesterone for another 12 day period. Progesterone was administered vaginally through a new gel (Crinone) utilizing a bioadhesive, biocompatible polymer as a base to achieve a sustained release effect. An endometrial biopsy was taken before treatment, after oestrogen-only treatment and after the oestro-progestogen therapy. Before treatment, all the patients exhibited an atrophic endometrium. After oestrogen-only treatment, typical proliferative changes occurred: an increase in the endometrium thickness, an increase in the mitotic index, numerous cylinder-like glands and no coiled glands, and high concentrations of oestrogen receptors (ER) and progesterone receptors (PR). After the oestro-progestogen therapy, whatever the dose of progesterone given, a secretory transformation of the endometrial mucosa occurred, mitotic activity decreased significantly, more ramified and coiled glands were observed, and a decrease in PR content was noted in epithelial and stromal nuclei, and a decrease in PR content was also observed in epithelial nuclei but not in stromal nuclei. Accurate new techniques of image analysis have shown that crinone therapy could eliminate the proliferative effects of oestrogen treatment in post-menopausal women, despite doses as low as 45 mg of progesterone administered vaginally every other day. The results suggest that the sustained release effects of Crinone are clinically relevant.
Donnez, Jacques; NISOLLE, Michelle ULg; Casanas-Roux, Françoise et al

in Human Reproduction (1996), 11(1), 224-8

A computerized morphometrical investigation was performed on endometriotic tissue from the peritoneum (n = 225) and rectovaginal nodules (n = 65) to compare histologically and stereologically the ... [more ▼]

A computerized morphometrical investigation was performed on endometriotic tissue from the peritoneum (n = 225) and rectovaginal nodules (n = 65) to compare histologically and stereologically the rectovaginal septum endometriotic nodule to peritoneal endometriosis. Mitotic activity, stromal vascularization and the epithelium/stroma ratio were found to be significantly different in peritoneal and rectovaginal endometriosis. The evaluation revealed a major role of glandular epithelium in rectovaginal nodules where the stroma sometimes appeared absent around glandular epithelium. The study demonstrated opposite effects of gonadotrophin-releasing hormone agonists (GnRHa) and lynestrenol on the two lesions. Indeed, in peritoneal endometriosis, after GnRHa therapy, our study demonstrated a lower rate of mitosis and poor stromal vascularization. The same drug was unable to induce the same effects in the nodule although, in contrast, lynestrenol has a strong effect on nodule vascularization. In conclusion, it is suggested that the rectovaginal adenomyotic nodule is a specific disease, different from peritoneal endometriosis. It is not the consequence of 'deep infiltrating' endometriosis but can probably develop from Mullerian rests present in the rectovaginal septum. [less ▲]

Detailed reference viewed: 267 (0 ULg)
See detailRécents développements de X-FEM appliqués à la mécanique de la rupture
Béchet, Eric ULg

Scientific conference (2007, June)

Detailed reference viewed: 11 (5 ULg)
Peer Reviewed
See detailRecepción actual de los manuscritos de Ferdinand de Saussure. Perspectivas teóricas e históricas.
Sofia, Estanislao ULg

Conference (2012, August 01)

Se le ha atribuido a Ferdinand de Saussure (1857-1913), a lo largo del siglo XX, la responsabilidad de más de una “revolución” [sobre la de los anagramas, ver Prosdocimi1894, p. 233]. Célebre en su época ... [more ▼]

Se le ha atribuido a Ferdinand de Saussure (1857-1913), a lo largo del siglo XX, la responsabilidad de más de una “revolución” [sobre la de los anagramas, ver Prosdocimi1894, p. 233]. Célebre en su época gracias a sus trabajos sobre el vocalismo indo-europeo (Saussure, 1879), cuyo estudio, precisamente, habría contribuido a revolucionar (Béguelin, 2003), Saussure alcanzó una difusión masiva póstumamente. El Cours de linguistique générale (1916) es así considerado por la tradición como el punto de inflexión que revolucionó (una vez más) las ciencias del lenguaje, al asumir y/o permitir un cambio de enfoque radical: el objeto de la lingüística sería no ya (o no ya solamente) la historia y la evolución de las lenguas, sino también (y sobre todo) la lengua en tanto sistema autónomo de signos (Saussure, 1916) cuya función esencial es la comunicación. Acentuando la importancia de este gesto, se erigió a Saussure en “fundador” no solamente de una escuela – el estructuralismo europeo – sino también, y más generalmente, de la lingüística moderna (cf. Culler, 1986, p. 15 ; Lyons, 1968, p. 38 ; Calvet, 1995, p. 507). El descubrimiento en 1996 de un nuevo fondo de manuscritos, parcialmente publicado en 2002 en los Écrits de linguistique générale, proporcionó a algunos lingüistas la ocasión de postular una nueva revolución: los manuscritos de Saussure, desenterrados un siglo después de haber sido escritos, contendrían potencial suficiente para conmocionar y restructurar (“bouleverser”) no sólo la lingüística contemporánea (Bouquet, 2004; Rastier, 2009), sino también las bases de la metafísica occidental (cf. Rastier, 2009). El propósito de este trabajo es el de revisar críticamente (si no de desactivar) los argumentos subyacentes a tal posición, para intentar de ese modo establecer cuáles son los criterios (¿biográficos, históricos, teóricos, filológicos?) que la sostienen. Intentaremos mostrar, en particular, que la apreciación de la importancia de un fondo de manuscritos científicos, como lo son en gran medida los de Saussure, no puede prescindir de una aproximación histórica, cuya carencia es evidente, justamente, en gran parte de los partidarios saussureanos (incluidos Rastier y Bouquet) de una nueva (o potencial) “revolución”. [less ▲]

Detailed reference viewed: 22 (1 ULg)