795 research outputs found
Message handling system concepts and services in a land mobile satellite system
A network architecture containing the capabilities offered by the Message Handling System (MHS) to the PRODAT Land Mobile Satellite System (LMSS) is described taking into account the constraints of a preexisting satellite system which is going to become operational. The mapping between MHS services and PRODAT requirements is also reported and shows that the supplied performance can be significantly enhanced to both fixed and mobile users. The impact of the insertion of additional features on the system structure, especially on the centralized control unit, are also addressed
Tomonaga-Luttinger physics in electronic quantum circuits
In one-dimensional conductors, interactions result in correlated electronic
systems. At low energy, a hallmark signature of the so-called
Tomonaga-Luttinger liquids (TLL) is the universal conductance curve predicted
in presence of an impurity. A seemingly different topic is the quantum laws of
electricity, when distinct quantum conductors are assembled in a circuit. In
particular, the conductances are suppressed at low energy, a phenomenon called
dynamical Coulomb blockade (DCB). Here we investigate the conductance of
mesoscopic circuits constituted by a short single-channel quantum conductor in
series with a resistance, and demonstrate a proposed link to TLL physics. We
reformulate and establish experimentally a recently derived phenomenological
expression for the conductance using a wide range of circuits, including carbon
nanotube data obtained elsewhere. By confronting both conductance data and
phenomenological expression with the universal TLL curve, we demonstrate
experimentally the predicted mapping between DCB and the transport across a TLL
with an impurity.Comment: 9p,6fig+SI; to be published in nature comm; v2: mapping extended to
finite range interactions, added discussion and SI material, added reference
Unique morphologies of <i>Encheliophis vermiops</i> (Carapidae) with revised diagnosis of the genus
Encheliophis vermiops was first briefly described in 1990 on the basis of three specimens. This study validates this species and provides previously unrecorded useful characters to realise the identification: (1) the forward orientation of the palatine teeth, (2) the enlarged teeth of the third basibranchial, (3) the particularly well-developed pharyngeal apparatus, (4) the unpigmented band along the base of anal fin and (5) the insertion of the primary sonic muscle on the parasphenoid. Moreover, the particular morphology of Encheliophis vermiops forces us to reconsider the diagnosis of the genus
Observation of a New Fluxon Resonant Mechanism in Annular Josephson Tunnel Structures
A novel dynamical state has been observed in the dynamics of a perdurbed
sine-Gordon system. This resonant state, has been experimentally observed as a
singularity in the dc current voltage characteristic of an annular Josephson
tunnel junction, excited in the presence of a magnetic field. With this
respect, it can be assimilated to self-resonances known as Fiske steps.
Differently from these, however, we demonstrate, on the basis of numerical
simulations, that its detailed dynamics involves rotating fluxon pairs, a
mechanism associated, so far, to self-resonances known as zero-field steps.Comment: 4 pages, 2 figures, submitted to Physical Review Letter
Contribution de la biologie moléculaire à la sélection animale: les marqueurs génétiques
Avec la domestication des animaux de rente, les éleveurs ont cherché d'une part, à
accroître les performances de leurs animaux en sélectionnant dans la population mise à leur
disposition les sujets les plus performants pour la (les) caractéristique(s) recherchée(s) et
d'autre part, à réduire l'impact des zoonoses en sélectionnant les animaux résistants. Toutefois,
si cette approche de la sélection a permis inconsciemment de favoriser au sein de la
population les génotypes intéressants pour les critères recherchés, il importe de garder en
mémoire que la production et la santé animale résultent non seulement du potentiel génétique
mais également d'interactions entre l'alimentation, le statut physiologique, les facteurs environnementaux et le savoir-faire de l'éleveur
Self-enrichment in globular clusters. I. An analytic approach
By means of analytical calculations, we explore the self-enrichment scenario
for Globular Cluster formation. According to this scenario, an initial burst of
star formation occurs inside the core radius of the initial gaseous
distribution. The outward-propagating shock wave sweeps up a shell in which
gravitational instabilities may arise, leading to the formation of a second,
metal-enriched, population of stars. We find a minimum mass of the
proto-globular cluster of the order of 10^6 solar masses. We also find that the
observed spread in the Magnitude-Metallicity relation can be explained assuming
cluster-to-cluster variations of some parameters like the thermalization
efficiency, the mixing efficiency and the Initial Mass Function, as well as
variations of the external pressure.Comment: 12 pages, 13 figures, accepted for publication in A&
Determining the origin of seafood products on the Belgian market: challenges to traceability and database management
In countries where the majority of the seafood is imported, information about seafood origin is important in particular from a food safety perspective. In the case of Belgium, no database is available describing the origin of commercial seafood products. This investigation to determine the origin revealed three important problems. First, information needed to stem from different non-related databases; second, import countries did not define fishing grounds or product sites; third, seafood may have transited many areas and no information was available on this. Since European traceability regulations have been established for seafood, some limited extra efforts with respect to data collection and management can lead to (inter)national databases making seafood traceability information more practically useful, for example towards public health policy making
Single electron quantum tomography in quantum Hall edge channels
We propose a quantum tomography protocol to measure single electron coherence
in quantum Hall edge channels and therefore access for the first time the wave
function of single electron excitations propagating in ballistic quantum
conductors. Its implementation would open the way to quantitative studies of
single electron decoherence and would provide a quantitative tool for analyzing
single to few electron sources. We show how this protocol could be implemented
using ultrahigh sensitivity noise measurement schemes.Comment: Version 3: long version (7 figures): corrections performed and
references have been added. Figures reprocessed for better readabilit
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