Search results for "Instrumentation"
showing 10 items of 4914 documents
Immobilization of single-stranded DNA fragments to solid surfaces and their repeatable specific hybridization : covalent binding or adsorption ?
2004
Abstract The different steps of the immobilization process of single-stranded DNA (ssDNA) on surfaces by means of chemical grafting have been investigated using systematic measurements of grafting and hybridization densities by means of radioactive labelling. The immobilization by chemical grafting to a dense monomolecular layer of N-hydroxysuccinimidyl ester reactive functions attached to silica plates was performed from a dilute solution of amino-terminated oligonucleotides (10 μmol/l). The slow evaporation of the solvent allowed to increase the DNA grafting density by a factor of 10. A precise control of the rinsing process that followed the immobilization reaction allowed the discrimina…
Holes Interaction and Heterogeinity Distribution Effect for a Multiperforated Plate
2012
International audience; Originally used to protect classical sound absorbing materials from environmental degradation, multi-perforated plates are considered to be one of the next generation soundproof solutions. This paper investigates the effects of holes interaction and heterogeneity distribution on the acoustical properties of a multi-perforated plate. These effects are observable on the specimens with closely separated holes. Multi-perforated plates with different center-to-center holes distances (pitches) are built and tested using an impedance tube. The cases of closely separated holes are analyzed and compared to the cases of widely separated holes. It is observed that in the presen…
Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the Pierre Auger Observatory
2015
We analyze the distribution of arrival directions of ultra-high energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set, about three times larger than that used in earlier studies, includes arrival directions with zenith angles up to $80^\circ$, thus covering from $-90^\circ$ to $+45^\circ$ in declination. After updating the fraction of events correlating with the active galactic nuclei (AGNs) in the V��ron-Cetty and V��ron catalog, we subject the arrival directions of the data with energies in excess of 40 EeV to different tests for anisotropy. We search for localized excess fluxes and for self-clustering of event directions at angular scales up t…
Search for Higgs boson pair production in the two bottom quarks plus two photons final state in pp collisions at a energy-of-centre of mass of 13 TeV…
2022
This thesis presents a physics analysis performed with the ATLAS detector at the Large Hadron Collider with data from the Run 2 (2015-2018) period of proton-proton collision at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity used for physics analyses of 139 inverse-fb. The analysis is a search for resonant and non-resonant Higgs boson pair production in the two bottom quarks and two photon final state. Special focus is given to the event selection strategy for the resonant search using multi-variate techniques. In addition, the ATLAS upgrade for the Run 3 (2022-2025) period where the software is migrated to a multi-threading framework is extensively covered alon…
Determining the effects of Eugenol on the bond strength of resin-based restorative materials to dentin : a meta-analysis of the literature
2020
Este artículo se encuentra disponible en la siguiente URL: https://www.mdpi.com/2076-3417/10/3/1070/htm Este artículo pertenece al número especial " Permanent and long-term biodegradable biomaterials". The aim of this study was to determine whether the residual presence of eugenol in coronal dentin may compromise the bond strength of resin-based restorative materials. A search was performed on MEDLINE/Pubmed, Scopus, and by hand search for relevant papers. No restriction was applied for language and publication date. The studies selected for analysis tested specimens with reduced size (micro-shear bond strength ( SBS) and micro-tensile bond strength ( TBS)) of adhesive systems and resin-bas…
Effects of defects on the tensile strength of short-fibre composite materials
2014
Abstract. Heterogeneous materials tend to fail at the weakest cross-section, where the presence of microstructural heterogeneities or defects controls the tensile strength. Short-fibre composites are an example of heterogeneous materials, where unwanted fibre agglomerates are likely to initiate tensile failure. In this study, the dimensions and orientation of fibre agglomerates have been analysed from three-dimensional images obtained by X-ray microtomography. The geometry of the specific agglomerate responsible for failure initiation has been identified and correlated with the strength. At the plane of fracture, a defect in the form of a large fibre agglomerate was almost inevitably found.…
The Pros and Cons of Beyond Standard Model Interpretations of ANITA Events
2019
The Antarctic Impulsive Transient Antenna (ANITA) experiment has observed two air shower events with energy $\sim 500~{\rm PeV}$ emerging from the Earth with exit angles $\sim 30^\circ$ above the horizon. As was immediately noted by the ANITA Collaboration, these events (in principle) could originate in the atmospheric decay of an upgoing $\tau$-lepton produced through a charged current interaction of a $\nu_\tau$ inside the Earth. However, the relatively steep arrival angles of these perplexing events create tension with the standard model (SM) neutrino-nucleon interaction cross section. Deepening the conundrum, the IceCube neutrino telescope and the Pierre Auger Observatory with substanti…
Vous mangez trop salé !
2016
Revue non indexée dans JCR.; La consommation de sel est excessive dans les pays industrialisés. Les autorités sanitaires recommandent donc une réduction drastique de la quantité de sel incorporée dans les aliments manufacturés. Afin de conserver une perception du produit à teneur réduite en sel identique à celle du produit original, le rendement d’extraction du sel par la salive doit donc être amélioré, par exemple en modifiant la texture de l’aliment. Le sel se libère graduellement des aliments solides pendant les processus résultant de la mastication et de la salivation et entraînant la déstructuration de l’aliment. Deux sondes ont été développées pour la mesure de la température et de la…
Fast blue B functionalized silica-polymer composite to evaluate 3,5-dihy-droxyhydrocinnamic acid as biomarker of gluten intake
2021
Celiac disease is an immune-mediated systemic disorder elicited by gluten and related prolamines in genetically susceptible individuals. The current treatment is a strict and lifelong gluten-free diet. However, compliance with the gluten-free diet is not always adequate and many food products contain low concentrations of gluten. The determination of dietary transgressions is a challenge for patients, physicians and dietitians. Alkylresorcinols (AR) have been proposed as sensitive and specific biomarkers of gluten consumption. In this work silica-polymer composites doped with fast blue B reagent (FB) have been used to estimate alkylresorcinols in biological samples. The proposed colorimetri…
CAROLS: A New Airborne L-Band Radiometer for Ocean Surface and Land Observations
2011
The "Cooperative Airborne Radiometer for Ocean and Land Studies" (CAROLS) L-Band radiometer was designed and built as a copy of the EMIRAD II radiometer constructed by the Technical University of Denmark team. It is a fully polarimetric and direct sampling correlation radiometer. It is installed on board a dedicated French ATR42 research aircraft, in conjunction with other airborne instruments (C-Band scatterometer--STORM, the GOLD-RTR GPS system, the infrared CIMEL radiometer and a visible wavelength camera). Following initial laboratory qualifications, three airborne campaigns involving 21 flights were carried out over South West France, the Valencia site and the Bay of Biscay (Atlantic O…