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See detailPrecessional and half-precessional climate forcing of Mid-Devonian monsoon-like dynamics
De Vleeschouwer; Da Silva, Anne-Christine ULg; Boulvain, Frédéric ULg et al

in Climate of the Past Discussions (2011), 7

Detailed reference viewed: 16 (7 ULg)
Peer Reviewed
See detailPrecessional and half-precessional climate forcing of Mid-Devonian monsoon-like dynamics
De Vleeschouwer, David; Da Silva, Anne-Christine ULg; Boulvain, Frédéric ULg et al

in Suttner; Kido; Piller (Eds.) et al Mid Paleozoic climate and biodiversity. IGCP-596 opening meeting. Abstract Volume (2011)

Detailed reference viewed: 4 (0 ULg)
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See detailPrêcher la Trinité dans le royaume carolingien. Un facteur de cohésion de l’Imperium christianum ?
Close, Florence ULg

Scientific conference (2008, October 04)

Une lecture attentive des admonestations ecclésiastiques de Charlemagne laisse entrevoir un renforcement très net du souci du souverain de l'enseignement de la doctrine chrétienne au lendemain du ... [more ▼]

Une lecture attentive des admonestations ecclésiastiques de Charlemagne laisse entrevoir un renforcement très net du souci du souverain de l'enseignement de la doctrine chrétienne au lendemain du couronnement impérial. La foi en la Trinité s'impose dans les capitulaires des missi des quinze premières années du IXe siècle comme l'une des priorités du programme religieux. Or, cet intérêt impérial ne date pas du couronnement. Il était déjà exprimé dans le texte fondateur de la réforme carolingienne, l'Admonitio Generalis de 789. Dans cette communication, l'auteur proposait un passage en revue des grandes étapes de l'instauration de l'enseignement de la doctrine trinitaire, d’abord en Francia, puis dans l'empire suivi d'un examen de quelques textes représentatifs du processus de maturation de la "théologie impériale". Il s'arrêtait ensuite sur les moyens mis à la disposition du clergé pour se préparer à enseigner ce mystère avant de formuler l'hypothèse d'une notable influence de cette "prédication" de la Trinité sur le processus d'unification de l'empire renaissant. [less ▲]

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See detailPrecipitation of auroral protons in detached arcs
Immel, Thomas J; Mende, Stephen B; Frey, Harald U et al

in Geophysical Research Letters (2002), 29

Recent global-scale observations by the IMAGE-FUV instrument demonstrate the existence of regions of particle precipitation at sub-auroral latitudes on the dayside. The signature of this precipitation is ... [more ▼]

Recent global-scale observations by the IMAGE-FUV instrument demonstrate the existence of regions of particle precipitation at sub-auroral latitudes on the dayside. The signature of this precipitation is seen infrequently, but when so, it is clear in all 3 channels of the FUV instrument. A conjugate hemisphere conjunction with the FAST satellite demonstrates the presence of precipitating protons and the notable absence of precipitating electrons in these arcs. With this knowledge, one can determine the mean energy and energy flux of the precipitating protons by intercomparison of the response in the three FUV channels. Assuming that the protons have a kappa energy distribution, the mean energy is found to be ~20 keV, with a peak in total energy flux of ~1 mW/m[SUP]2[/SUP]/sec, consistent with fits to the FAST ion measurements. These phenomena are observed mainly during times of high solar wind dynamic pressure and variable interplanetary magnetic field, and are associated with earlier nightside enhancements in the brightness and latitudinal extent of the proton aurora. [less ▲]

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See detailPrécipitations atmosphériques et altitude. Prélude à une cartographie des montants annuel et mensuels en Belgique
Alexandre, Jean ULg; Erpicum, Michel ULg; Mabille, Georges ULg et al

in Publications de l'Association Internationale de Climatologie (1998), 11

Detailed reference viewed: 98 (45 ULg)
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See detailPrécis d'urologie de l'enfant
Battisti, Oreste ULg

Book published by les éditions de l'Université de Liège (2012)

Detailed reference viewed: 94 (9 ULg)
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See detailPrécis de droit judiciaire (tome 1) - Les institutions judiciaires : organisation et éléments de compétence
de Leval, Georges ULg; Georges, Frédéric ULg

Book published by Larcier (2010)

Cet ouvrage décrit l'organisation du service public de la justice en Belgique

Detailed reference viewed: 405 (40 ULg)
See detailPrécis de droit pénal social
Kefer, Fabienne ULg

Book published by Anthémis (2008)

Detailed reference viewed: 63 (13 ULg)
See detailPrécis de droit pénal social
Kéfer, Fabienne ULg

Book published by Anthémis - 2è éd. (2014)

Detailed reference viewed: 36 (7 ULg)
See detailPrécis de géométrie élémentaire
Folie, François ULg

Book published by F. Desoer (1876)

Detailed reference viewed: 6 (0 ULg)
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See detailPrécis de néonatologie
Battisti, Oreste ULg

Book (2010)

précis de néonatologie pour la pratique courante de néonatolgoie intermédiare

Detailed reference viewed: 164 (21 ULg)
See detailPrécis de Pilotage de Sage BOB 50
Chanteux, Anne ULg

Book published by EDIPRO (2009)

Detailed reference viewed: 135 (25 ULg)
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See detailPrécis de rhumatologie de l'enfant
Battisti, Oreste ULg

Book published by Les éditions de l'Université de Liège (2012)

Detailed reference viewed: 98 (10 ULg)
See detailPrécis de sémiotique générale
Klinkenberg, Jean-Marie ULg

Book published by Le Seuil (2000)

Detailed reference viewed: 232 (12 ULg)
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See detailPrécis du cours de mécanique appliquée
Brasseur, Jean-Baptiste; Folie, François ULg

Book published by J.-C. Carmanne (1868)

The highlights of this precis are: the general considerations on the machines, the periodicity, the speed influence, the industrial value, the work reduction of the passive resistances and the regulators ... [more ▼]

The highlights of this precis are: the general considerations on the machines, the periodicity, the speed influence, the industrial value, the work reduction of the passive resistances and the regulators theory. In his foreword, François Folie shares his feelings about the death and the works of his teacher J.-B. Brasseur. He explains his initiatives as for the final writing of applied mechanics session precis. [less ▲]

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See detailPrécis historique de la découverte de la nutation diurne
Folie, François ULg

in Annuaire de l'Observatoire Royal de Belgique (1897), 64

The author summarizes his constants determination of the diurnal nutation and the obstacles which he had to overcome to reach his goal.

Peer Reviewed
See detailPrecise demarcation of the breakpoint in a thoroughbred stallion carrying a ECA5 and ECA16 Translocation.
Durkin, Keith ULg; Raudsepp, T; Chowdhary, B.P.

in Proceedings of Plant & Animal Genome XVI (2008, January)

Detailed reference viewed: 14 (1 ULg)
Peer Reviewed
See detailPrecise localization of antigens on follicular dendritic cells.
Radoux, D.; Heinen, Ernst ULg; Kinet-Denoel, C. et al

in Cell & Tissue Research (1984), 235(2), 267-74

Horse-spleen ferritin or bovine serum albumin conjugated to colloidal gold (BSA-gold) were injected subcutaneously in preimmunized mice. In draining lymph nodes both antigens were located in macrophages ... [more ▼]

Horse-spleen ferritin or bovine serum albumin conjugated to colloidal gold (BSA-gold) were injected subcutaneously in preimmunized mice. In draining lymph nodes both antigens were located in macrophages or between the cytoplasmic processes of follicular dendritic cells (FDC). Some of the antigens remained trapped on FDC until day 31 after injection. Simultaneous injection of both antigens showed that they were located between the infoldings of the same FDC. These cells are thus able to retain at least two different antigens on their surface. The peculiar arrangement of ferritin between the cytoplasmic infoldings suggests that this antigen is fixed on both cell membranes by specific antibodies. The trapped immune complexes could thus stabilize the FDC membrane system. The antigen retention requires the presence of specific antibodies since BSA-gold or ferritin injected without preimmunization were not found between FDC processes. Nonantigenic materials, such as colloidal gold or carbon particles, are not trapped by FDC, except when injected in large amounts. The antigens were trapped on the surface of FDC, however unfrequently in close contact with lymphocytes. FDC might protect lymphocytes against an excess of immune complexes and act as regulators of contacts between lymphocytes and immune complexes. [less ▲]

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See detailPrecise Point Positioning: Performances under Ionospheric Scintillations
Lonchay, Matthieu ULg

Report (2012)

The Precise Point Positioning (PPP) has become a powerful satellite positioning technique which nearly equals performances provided by advanced relative positioning techniques. Exploiting the growing ... [more ▼]

The Precise Point Positioning (PPP) has become a powerful satellite positioning technique which nearly equals performances provided by advanced relative positioning techniques. Exploiting the growing availability and quality of IGS products (satellite orbit and clock products), the PPP technique can now provide a centimetre level solution in static mode and a decimetre level in kinematic mode. However, the PPP technique still presents some weaknesses. In order to reach a high precision level, it requires a significant convergence period which can typically reach 30 minutes under normal conditions. Moreover, the PPP seems to be especially sensitive to ionospheric scintillations effects which involve signal amplitude and phase variations of GNSS signals. These weaknesses still limit the use of the PPP technique in the frame of some specific and demanding applications (agricultural industry, airborne mapping, etc.). The goal of our research project is to develop new data processing strategies attempting both to make the PPP technique more reliable under ionospheric scintillations and to optimize the PPP convergence time. The project is composed of several workpackages aiming to improve the mentioned current PPP weaknesses with specific strategies. One of the workpackages is devoted to the impact of satellite geometry on PPP performances. Ionospheric scintillations are susceptible to reduce the number of tracked satellites which degrades the quality of satellite geometry. Based on an analytical development, we first attempt to figure out what types of satellite geometry can be harmful. Then, we discuss about the improvement of the satellite geometry quality involved by the combined use of GPS and Galileo and its benefits in the frame of the PPP. Another workpackage is related to the weighting scheme. Based on an iterative least-square adjustment, the PPP algorithm requires the definition of a stochastic model composed of an observation covariance matrix. Usually, this matrix is chosen as diagonal with zero covariances assuming that correlations between observations can be neglected. In particular, our project aims to study the validity of this stochastic model for the PPP in order to determine whether tuning the weighting scheme of the stochastic model can improve the PPP performances. By exploiting spatial analysis techniques, we try to characterize the spatial auto-correlation between GNSS observations, considering the signal-to-noise ratio as the main observable. From the results of these experiments, we will discuss about the spatial correlation between GNSS observations both under normal conditions and ionospheric scintillations. [less ▲]

Detailed reference viewed: 38 (3 ULg)
Full Text
See detailPrecise Point Positioning: Performances under Ionospheric Scintillations
Lonchay, Matthieu ULg; Aquino, Marcio; Hancock, Craig et al

Scientific conference (2012, June 14)

The Precise Point Positioning (PPP) has become a powerful satellite positioning technique which nearly equals performances provided by advanced relative positioning techniques. Exploiting the growing ... [more ▼]

The Precise Point Positioning (PPP) has become a powerful satellite positioning technique which nearly equals performances provided by advanced relative positioning techniques. Exploiting the growing availability and quality of IGS products (satellite orbit and clock products), the PPP technique can now provide a centimetre level solution in static mode and a decimetre level in kinematic mode. However, the PPP technique still presents some weaknesses. In order to reach a high precision level, it requires a significant convergence period which can typically reach 30 minutes under normal conditions. Moreover, the PPP seems to be especially sensitive to ionospheric scintillations effects which involve signal amplitude and phase variations of GNSS signals. These weaknesses still limit the use of the PPP technique in the frame of some specific and demanding applications (agricultural industry, airborne mapping, etc.). The goal of our research project is to develop new data processing strategies attempting both to make the PPP technique more reliable under ionospheric scintillations and to optimize the PPP convergence time. The project is composed of several workpackages aiming to improve the mentioned current PPP weaknesses with specific strategies. One of the workpackages is devoted to the impact of satellite geometry on PPP performances. Ionospheric scintillations are susceptible to reduce the number of tracked satellites which degrades the quality of satellite geometry. Based on an analytical development, we first attempt to figure out what types of satellite geometry can be harmful. Then, we discuss about the improvement of the satellite geometry quality involved by the combined use of GPS and Galileo and its benefits in the frame of the PPP. Another workpackage is related to the weighting scheme. Based on an iterative least-square adjustment, the PPP algorithm requires the definition of a stochastic model composed of an observation covariance matrix. Usually, this matrix is chosen as diagonal with zero covariances assuming that correlations between observations can be neglected. In particular, our project aims to study the validity of this stochastic model for the PPP in order to determine whether tuning the weighting scheme of the stochastic model can improve the PPP performances. By exploiting spatial analysis techniques, we try to characterize the spatial auto-correlation between GNSS observations, considering the signal-to-noise ratio as the main observable. From the results of these experiments, we will discuss about the spatial correlation between GNSS observations both under normal conditions and ionospheric scintillations. [less ▲]

Detailed reference viewed: 37 (3 ULg)