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Image coding with incomplete transforms competition for HEVC
No full textOvercomplete transforms have received considerable attention over the past years. However, they often suffer from a complexity burden. In this paper, a low complexity approach is provided, where an orthonormal basis is complemented with a set of incomplete transforms: those incomplete transforms include a reduced number of basis vectors that allow a reduction on the coding complexity and ensure a certain level of sparsity. The solution has been implemented in the HEVC standard and compression gains of around 1% on average are reported while reducing the decoder complexity in about 5%.IE
Asymmetrically coupled resonators for mass sensing
No full textMechanically coupled resonators have been applied in the last years to the development of nanomechanical mass-sensors based on the detection of the different vibration modes of the system by measuring on a single resonator. Their sensitivity and capability for detecting multiple analytes strongly depends on the design and coupling strength between the mechanically coupled resonators in an array format. We present a theoretical and experimental study of the behavior of an asymmetrically coupled array of four different resonators. These doubly clamped beam resonators are elastically coupled by an overhang region of varying length along the transversal axis of the array. The results show that parameters such as the gap between microbeams and the overhang length affect the coupling strength, tuning the system from highly disordered and highly localized (weak coupling) to highly delocalized (strong coupling). In the strong coupling and partially localized case, the distances between resonant peaks are larger, reaching higher eigenfrequency values. In this case, relative changes in a specific eigenstate, due to an added mass, can be markedly large due to the energy distribution over a single microbeam. A strong coupling also facilitates performing the detection on the relative frequency shift mode, which can usually be resolved with better precision than the amplitude changes.NEM
Conditional autoimmunity mediated by human natural anti-Fc(epsilon)RIalpha autoantibodies?
No full textNatural antibodies provide an early defense mechanism against pathogens, show a frequent self-reactivity, and are present throughout life. Two questions concern the physiological control of self-reactivity and the pathogenetic link to autoimmune disease. Here we propose a concept of conditional autoimmunity involving natural antibodies against the alpha chain of the high-affinity receptor for IgE (Fc(epsilon)RIalpha ). Like other natural antibodies, anti-Fc(epsilon)RIalpha antibodies are found in sera of healthy donors. We now report the first human recombinant anti-Fc(epsilon)RIalpha autoantibodies isolated by repertoire cloning from a human tonsillar IgM library. These high-affinity antibodies recognize Fc(epsilon)RIalpha on cells and trigger histamine release from freshly isolated blood basophils. However, the latter effect requires IgE removal from the Fc(epsilon)RI. The same conditional histamine release is seen when using sera from individual normal donors and affinity-purified anti-Fc(epsilon)RIalpha antibodies isolated from multidonor therapeutic IgG preparations. We propose that such anti-Fc(epsilon)RIalpha antibodies can become pathogenic and that this is dependent on the state of occupancy of the Fc(epsilon)RIalpha by its natural ligand IgE. We suggest that an imbalance between Fc(epsilon)RIalpha occupancy and natural anti-Fc(epsilon)RIalpha antibodies may be implicated in the pathogenesis of autoimmune urticaria.LBTCInstitute of Immunology and Allergology, Inselspital, CH-3010 Bern, Switzerland.Journal ArticleResearch Support, Non-U.S. Gov'tUnited Statesofficial publication of the Federation of American Societies for Experimental Biolog
Theoretical Methods for Wave Propagation across Jointed Rock Masses
No full textDifferent methods are presently available for the analysis of wave propagation across jointed rock masses with the consideration of multiple wave reflections between joints. These methods can be divided into two categories. One is based on the displacement discontinuity model for representing rock joints, where the displacements across a joint are discontinuous and the tractions are continuous, and the other is the equivalent medium method. For the first category, there are three methods, i.e., method of characteristics (MC), scattering matrix method (SMM) and virtual wave source method (VWS). MC solves the equation of motion by using the theory of characteristic curves. SMM is based on the definition of the scattering matrix in which the reflection and transmission coefficients of a set of joints are stored. VWS method replaces the joints in the rock mass with a virtual concept. For the second category, equivalent medium model treats the problem in the frame of continuum mechanics and simplifies it from an explicit wave propagation equation. The objective of this paper is to review and compare these theoretical methods. The comparison shows that the four solutions agree very well with each other. Some additional considerations about the advantages and disadvantages of these methods are also given in the paper.LM
Types and concentration of microplastics found on remote island beaches during the Race for Water Odyssey
No full textInitiated in 2015 by the Race for Water Foundation,
the Race for Water Odyssey is an environmental expedition which sailed across Atlantic, Pacific & Indian Oceans. It has 3 main goals: i) analyse plastic pollution on beaches of remote islands; ii) raise awareness about water plastic pollution; iii) identify solutions to prevent waste from ending in the ocean. Results: High inter-archipelago and inter-beaches variability of micro-plastic concentrations for this worldwide study The North and South Pacific Gyres are the most polluted areas, followed by the North Atlantic Gyre and the Indian Ocean Gyre. Data for the South Atlantic Gyre will come later Hard fragments in large proportion in every stopover, probably mostly due to the degradation of larger plastic debris Pellets also are of great concern, as they were found in every beach, except for Palau
Higher polyethylene proportion for hard fragments (1-5 mm), with significant local variationsGR-CE
Simulation du trafic lors du chantier d'autoroute sur l'échangeur d'Ecublens
No full textLe but est de déterminer, à l'aide de la microsimulation, la gêne causée par le chantier sur le trafic d'une part et d'autre part de déterminer s'il faut supprimer une voie dans la zone d'entrée, afin de faciliter l'insertion des véhicules sur l'autoroute. Seules les étapes impliquant un régime de trafic très restreint font l'objet de cette étude.LAVOCRapport d'étude LAVO
The FHA domain: a putative nuclear signalling domain found in protein kinases and transcription factors
No full textGR-BUCHE
Véhicule automobile comportant un dispositif de sécurité muni d'un sac de protection gonflable
No full textVéhicule muni d'un airbag s'étendant -d'une seule pièce- sur toute la partie centrale du panneau de bord. Variantes pour protection latérale, pare-brise et fenêtres. Adapté tout particulièrement pour concepts pilotés par joy-sticks. SMH - MCC Smart car concepts (électrique, hybride, essence)LEM-CDMEuropean Patent. 92113608.1 6 Oct. 1992. Company: Swatch - Mercedes-Benz. http://v3.espacenet.com/textdoc?DB=EPODOC&IDX=MD1326&F=0 United States Patent. January, 23, 1996. Company: Swatch - Mercedes-Benz. http://freepatentsonline.com/5486019.html Alternative title(s) : (de) Sicherheitseinrichtung in form eines gaskissens für kraftfahrzeug. (fr) Véhicule automobile comportant un dispositif de sécurité muni d'un sac de protection gonflable. (en) Gas cushion safety device for vehicles
A 240×180 10mW 12us latency sparse-output vision sensor for mobile applications
No full textThis paper proposes a 0.18um CMOS vision sensor that combines event driven asynchronous readout of temporal contrast with synchronous frame-based active pixel sensor readout of intensity. The sensor is suitable for mobile applications because it allows low latency at low data rate and therefore, low system-level power consumption. The image frames can be used for scene analysis and the temporal contrast events with 12us latency can be used to track fast moving objects. © 2013 JSAP.NCCR-ROBOTIC