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
See detailFar ultraviolet Observations of Jovian low latitude regions with HST/STIS
Gustin, Jacques ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

in Bulletin of the American Astronomical Society (1999, September 01), 30(11),

Far ultraviolet observations of the Jovian disk were made at low and mid-latitudes with FUV MAMA/STIS on board HST in January 1999 both in the imaging and spectroscopic modes. An image was obtained with ... [more ▼]

Far ultraviolet observations of the Jovian disk were made at low and mid-latitudes with FUV MAMA/STIS on board HST in January 1999 both in the imaging and spectroscopic modes. An image was obtained with the Lyalpha filter in the hydrogen bulge region for comparison with the expected Lyman-alpha brightness distribution for Ly-alpha resonance scattering. Other images in the 1200-1700 { Angstroms} region show band structures parallel to the equator with fading contrast toward the center and the limb. Spectroscopic observations were made in the 1200-1700 { Angstroms} (G140L) and 1245-1298 { Angstroms} (G140M) regions at ~ 5 { Angstroms} resolution to map the H_2 airglow and the UV absorbents along the STIS slit. Preliminary results indicate that a C_2H_2 absorption signature is clearly observed in the solar ultraviolet reflected spectrum. The ethylene absorption may be mapped to derive variations of the acetylene abundance. The H_2 FUV airglow shows both the fluorescence and the electron impact components. Its spatial variation is described and compared with the expected airglow distribution. We acknowledge funding by NASA and by the PRODEX program of the European space agency. [less ▲]

Detailed reference viewed: 28 (17 ULg)
Full Text
Peer Reviewed
See detailFar ultraviolet remote sensing of the isotropy boundary and magnetotail stretching
Blockx, Caroline ULg; Gérard, Jean-Claude ULg; Meurant, M. et al

in Journal of Geophysical Research. Space Physics (2005), 110(A11),

Several studies have attempted to identify the isotropy boundary (IB) defining the limit between the adiabatic and nonadiabatic trajectories of the trapped protons along closed magnetic field lines. This ... [more ▼]

Several studies have attempted to identify the isotropy boundary (IB) defining the limit between the adiabatic and nonadiabatic trajectories of the trapped protons along closed magnetic field lines. This boundary is an indicator of the amount of magnetic field line stretching in the magnetotail. Previous studies were based on in situ measurements, resulting in spatially and temporally restricted samples. To overcome these limitations, we propose to use global data obtained with the FUV spectrographic proton auroral imager (SI12) on board the IMAGE satellite. We determine at each magnetic local time the position of an optical boundary related to the IB and thereby to the stretching of the magnetic field lines. We show that the correspondence between the latitude of the maximum proton precipitation observed by SI12 and the IB measured by Defense Meteorological Satellite Program satellites is statistically established and depends on the magnetic local time. The relation between the position of the maximum proton precipitation as well as the intensity of this maximum and the magnetic field distortion is determined by comparison with GOES 8 data. We suggest that SI12 images can be used as a tool to globally determine the isotropy boundary and to monitor the level of stretching in the magnetotail. [less ▲]

Detailed reference viewed: 25 (4 ULg)
Peer Reviewed
See detailFar upstream sequences regulate the human prolactin promoter transcription
Van de Weerdt, Cécile ULg; Peers, Bernard ULg; Belayew, A. et al

in Neuroendocrinology (2000), 71(2), 124-37

The human prolactin gene is mainly expressed in pituitary lactotrope cells, but transcription from an alternative, far upstream promoter was detected in lymphoid, placental and mammary cells. We describe ... [more ▼]

The human prolactin gene is mainly expressed in pituitary lactotrope cells, but transcription from an alternative, far upstream promoter was detected in lymphoid, placental and mammary cells. We describe the transcriptional activity in rat pituitary cells of the complete region separating the two promoters, using transient transfection experiments. A far upstream activating region was only functional in combination with the prolactin promoter. DNaseI protection experiments revealed, in addition to binding sites for the pituitary-specific factor Pit-1, sites (e.g. SD1) for several ubiquitous factors and one lymphoid-specific factor (SD4). A single copy of the ubiquitous site SD1 or the lymphoid-specific site SD4 was unable to activate transcription of a heterologous promoter in pituitary cells. However, SD1 activated transcription in nonpituitary cells and SD4 was functional specifically in lymphoid cells. Five copies of a distal site (D8) activated transcription in each cell type tested. Gel retardation experiments show that this site binds the specific factor C/EBP in liver and a distinct factor in other cell types. Our results suggest that different elements within this large region direct specific expression from each promoter via a complex interplay between cell-specific and ubiquitous transcription factors. [less ▲]

Detailed reference viewed: 25 (7 ULg)
Full Text
Peer Reviewed
See detailFar-field decoupled basis for the method of moments-2D case
V Sabariego, Ruth ULg; Landesa, Luis; Obelleiro, Fernando

in Progress in Electromagnetics Research [=PIER] (1999), 24

When solving electromagnetic problems, integral equation methods, such as the Method of Moments, are known to yield to dense matrix systems whose solution usually supposes an intensive computational cost ... [more ▼]

When solving electromagnetic problems, integral equation methods, such as the Method of Moments, are known to yield to dense matrix systems whose solution usually supposes an intensive computational cost. Continuous efforts have been developed to overcome this drawback. In this paper, the goal is to generate a set of basis functions defined over the entire domain and characterized by a null radiated power coupling in the far-field region. This behavior permits to diminish the density of unknowns per wavelength, considering only a reduced set of the new basis. Furthermore, the resulting matrix has a sparse structure. All these factors amounts to considerable savings in terms of computer storage and CPU requirements. [less ▲]

Detailed reference viewed: 8 (2 ULg)
Peer Reviewed
See detailFar-field decoupled basis for the method of moments-2D case - Abstract
V Sabariego, Ruth ULg; Landesa, Luis; Obelleiro, Fernando et al

in Journal of Electromagnetic Waves & Applications (1999), 13(11), 1529-1530

When solving electromagnetic problems, integral equation methods, such as the Method of Moments, are known to yield to dense matrix systems whose solution usually supposes an intensive computational cost ... [more ▼]

When solving electromagnetic problems, integral equation methods, such as the Method of Moments, are known to yield to dense matrix systems whose solution usually supposes an intensive computational cost. Continuous efforts have been developed to overcome this drawback. In this paper, the goal is to generate a set of basis functions defined over the entire domain and characterized by a null radiated power coupling in the far-field region. This behavior permits to diminish the density of unknowns per wavelength, considering only a reduced set of the new basis. Furthermore, the resulting matrix has a sparse structure. All these factors amounts to considerable savings in terms of computer storage and CPU requirements. [less ▲]

Detailed reference viewed: 20 (2 ULg)
See detailA Far-UV Imager for the Jupiter Ganymede Orbiter
Bunce, E. J.; Molyneux, P.; Bannister, N. et al

Poster (2010, May 17)

Detailed reference viewed: 21 (3 ULg)
Full Text
Peer Reviewed
See detailThe far-UV spectrum of the low-excitation planetary nebula HD 138403
Surdej, Jean ULg; Heck, A.

in Astronomy and Astrophysics (1982), 116

Two high-resolution far-UV spectra of the low-excitation planetary nebula HD 138403 are analyzed which were obtained with the IUE satellite over the wavelength range from 1170 to 2070 A. It is shown that ... [more ▼]

Two high-resolution far-UV spectra of the low-excitation planetary nebula HD 138403 are analyzed which were obtained with the IUE satellite over the wavelength range from 1170 to 2070 A. It is shown that the nebula's far-UV spectrum comprises a stellar continuum on which are superimposed a few emission lines, numerous interstellar absorption lines, and various types of P Cygni profiles. Evidence is examined for substantial mass loss from the central nucleus, with terminal velocities of the order of 800 km/s. The observed nebular emissions are used to derive the electron density in the main nebula. The results are taken as supporting the hypothesis that a bipolar structure is expanding around HD 138403 via a selective radiation process involving an edge- or line-locking mechanism or both. [less ▲]

Detailed reference viewed: 16 (0 ULg)
Full Text
Peer Reviewed
See detailFaraday instability at foam/water interface
Bronfort, Ariane ULg; Hervé, Caps

in Physical Review. E : Statistical, Nonlinear, and Soft Matter Physics (2012)

Detailed reference viewed: 15 (8 ULg)
Full Text
Peer Reviewed
See detailFaraday instability on a network
Delon, Giles ULg; Terwagne, Denis ULg; Adami, Nicolas ULg et al

in Chaos (2010)

Detailed reference viewed: 51 (17 ULg)
Full Text
See detailFaraday instability on a network
Delon, Giles ULg; Terwagne, Denis ULg; Adami, Nicolas ULg et al

Poster (2010, March)

Detailed reference viewed: 21 (9 ULg)
See detailLe farfalle di Madrid : L'antimonio, i narratori italiani e la guerra civile spagnola
Curreri, Luciano ULg

Book published by Bulzoni (2007)

Detailed reference viewed: 8 (0 ULg)
Full Text
Peer Reviewed
See detailFarm tourism across Europe
Potocnick, Irma; Schmitz, Serge ULg

in European Countryside (2013), 5(4), 265-376

Because we acknowledge both the importance of the geographical context on agritourism and the richness of benchmarking, discussions aim to underline and to understand original agritourism practices in ... [more ▼]

Because we acknowledge both the importance of the geographical context on agritourism and the richness of benchmarking, discussions aim to underline and to understand original agritourism practices in relation to their spatial context. According to Sznajder et al. (2009) attention has to be paid to the historical structure of economy, the state of farming, the demographic situation, the accessibility, the social attitudes, the capital resources. Therefore the structure of the farms, the available labour force and buildings, the capital resources as well as the surroundings (including landscape features, natural and cultural heritages) comprise the main characteristics. This special issue aims to explore both the local impacts of agritourism development and the positioning of agritourism on tourist market. [less ▲]

Detailed reference viewed: 33 (6 ULg)
Full Text
Peer Reviewed
See detailFarm Tourism across Europe
Potočnik Slavič, Irma; Schmitz, Serge ULg

in European Countryside (2013), 5(4), 265-274

Based on evidence from nine countries (UK, Belgium, France, Germany, Italy, Poland, Croatia, Slovenia, and Ireland), this special issue analyses the fabrics of farm tourism in Europe. It identifies two ... [more ▼]

Based on evidence from nine countries (UK, Belgium, France, Germany, Italy, Poland, Croatia, Slovenia, and Ireland), this special issue analyses the fabrics of farm tourism in Europe. It identifies two main development trends: on one hand, a small scale and dispersed activities, at the other hand a product in response to tourist market demand. A brief overview of existing farm tourism practices in the European rural areas indicated an interesting interface between the forms and dimension of farm tourism embeddedness in local environment and at the same time, the ways and range of internationalization of farm tourism business. [less ▲]

Detailed reference viewed: 34 (8 ULg)
Full Text
Peer Reviewed
See detailFarmer perceptions and pathological constraints in helmeted guinea fowl farming in the Borgou department in North-East Benin
Boko, C. K.; Kpodekon, M. T.; Farougou, S. et al

in African Journal of Agricultural Research (2011), 6

Detailed reference viewed: 9 (1 ULg)
Full Text
Peer Reviewed
See detailFarmer's views and values to focus on cattle conservation policies: the case of eight European countries
Gandini, G; Martin-Collado, D; Colinet, Frédéric ULg et al

in Journal of Animal Breeding & Genetics (2012), 129

Our aim was to identify elements useful in designing policies and programmes for conservation of farm animal genetic resources, taking as case study a group of European local cattle breeds. We first ... [more ▼]

Our aim was to identify elements useful in designing policies and programmes for conservation of farm animal genetic resources, taking as case study a group of European local cattle breeds. We first investigated the implications of differences among countries in the policies and programmes to be developed. Secondly, we analysed key elements common to countries, which may affect local breed viability. We used the herd size trend expected by the farmer in the near future as an indicator of breed viability. Fifteen breeds, for a total of 355 farms, were surveyed. To take into account the multiple factors influencing breeds’ demographic trends, the questionnaire included economical, technical and social aspects. Among the major differences across countries was the perception of the farmer on the value attributed to the local breed by society. Concerning the elements common to countries and their association to breed viability, the greater the collaboration among farmers and the stakeholders’ appreciation as perceived by the farmer, the greater the viability of the farm. An opposite trend was observed for the age of the farmer. Older farmers generally planned to soon cease farming or decrease herd size, whereas young farmers planned to increase the size of their herds. Implications of including these elements in conservation polices are discussed. [less ▲]

Detailed reference viewed: 33 (7 ULg)