410 research outputs found
Charm semileptonic decays at the B factories
A review of charm semileptonic decays results obtained at B factories is
presented. It focuses on form factors measurements in ,
, , and . For the last two decay channels, the contribution and
characteristics of other components in the final state, in addition to the main
vector contribution, is also studied
Recent results on semileptonic decays at Babar
Some recent Babar results on semileptonic decays are presented. They focus on
the determination of the CKM matrix elements |V_{ub}| and |V_{cb}| in inclusive
and exclusive b --> u l nu and b--> c l nu decays, and on form factors
measurement in exclusive c--> s l nu decays.Comment: 4 pages, 1 figure, contributed to the proceedings of QCD 08
Montpellier, France, 7-12th July 200
Summary of the CKM 2016 working group on rare decays
Rare , , and decays offer unique opportunities to probe for
evidence of new particles from physics beyond the Standard Model at mass scales
extending from the electroweak scale to well above those directly accessible at
the LHC. We review a selection of theoretical and experimental results on rare
, , and decays illustrating the progress made during the past two
years.Comment: 15 pages, 3 figures. To appear in the proceedings of the 9th
International Workshop on the CKM Unitarity Triangle, Nov 28- Dec 2 2016,
Mumba
Le Cénozoïque du bassin de Paris : un enregistrement sédimentaire haute résolution des déformations lithosphériques en régime de faible subsidence
International audienceLe bassin de Paris est considĂ©rĂ© comme un exemple typique de bassin intracratonique affectĂ© par une subsidence thermique long terme. Le CĂ©nozoĂŻque correspond Ă une pĂ©riode de faible subsidence (Ă©paisseurs infĂ©rieures Ă 350m) et marque la fin du fonctionnement de ce bassin. Câest en outre une pĂ©riode de forte dĂ©formation de la plaque europĂ©enne, dans un contexte de convergence Afrique-Eurasie et dâouverture de l'Atlantique Nord caractĂ©risĂ©e par des inversions de grabens dans le Nord et lâEst de lâEurope. Si de nombreux hiatus ont Ă©tĂ© identifiĂ©s, les dĂ©formations cĂ©nozoĂŻques du bassin de Paris, situĂ©es sur une croute Ă lâĂ©quilibre et leur relation aux contraintes en limite de plaque restent mĂ©connues. Cette thĂšse a pour objectif de recomposer Ă haute rĂ©solution spatiale et temporelle (de lâordre du million dâannĂ©es) les gĂ©omĂ©tries sĂ©dimentaires 3D et les palĂ©ogĂ©ographies successives du PalĂ©ocĂšne au dĂ©but de lâOligocĂšne. Ce travail qui sâappuie sur de nombreuses donnĂ©es biostratigraphiques consiste en une approche couplĂ©e de sĂ©dimentologie de faciĂšs et de corrĂ©lations diagraphiques (500 puits) selon les principes de la stratigraphie sĂ©quentielle. Trois ordres de sĂ©quences sont dĂ©finis. Les cycles dâordre supĂ©rieur (4Ăšme et 3Ăšme ordre) enregistrent les variations climato-eustatiques. Cinq sĂ©quences de dĂ©pĂŽt (2e ordre), limitĂ©es par des discontinuitĂ©s et/ou des rĂ©organisations palĂ©ogĂ©ographiques sont identifiĂ©es : (1) Maastrichtien-Danien ; (2) ThanĂ©tien-YprĂ©sien ; (3) LutĂ©tien-Bartonien ; (4) Bartonien-Priabonien terminal et (5) Priabonien terminal-Chattien. Les architectures des sĂ©quences (1) Ă (4) sont contrĂŽlĂ©es par des phases de flexures. AprĂšs des Ă©mersions lors des paroxysmes de flexuration, la relaxation progressive des flexures se traduit tout dâabord par la mise en place de profils pentĂ©s et ouverts, puis par des profils de plus en plus plats et confinĂ©s associĂ©s Ă une transgression gĂ©nĂ©ralisĂ©e. Du ThanĂ©tien au Bartonien sâobservent des flexures dâaxe E-W, dont les Ăąges sont compatibles avec les diffĂ©rentes phases de la convergence IbĂ©rie-Eurasie. En outre, une dĂ©formation de courte durĂ©e Ă lâYprĂ©sien basal est rattachĂ©e Ă l'ouverture de l'Atlantique Nord. Enfin, une rĂ©orientation majeure du bassin possiblement liĂ©e au dĂ©but de la collision Apulie-Eurasie est observĂ©e au Priabonien. Ce travail fournit un calage Ă haute rĂ©solution pour la comprĂ©hension et la modĂ©lisation des dĂ©formations intraplaques. DiffĂ©rentes tailles de flexure, de lâordre de 150 Ă plus 300 km sont observĂ©es traduisant une implication dâĂ©paisseurs plus ou moins importantes de la lithosphĂšre
Development and Potential Usefulness of the COVID-19 Ag Respi-Strip Diagnostic Assay in a Pandemic Context
Introduction: COVID-19 Ag Respi-Strip, an immunochromatographic (ICT) assay for
the rapid detection of SARS-CoV-2 antigen on nasopharyngeal specimen, has been
developed to identify positive COVID-19 patients allowing prompt clinical and quarantine
decisions. In this original research article, we describe the conception, the analytical and
clinical performances as well as the risk management of implementing the COVID-19 Ag
Respi-Strip in a diagnostic decision algorithm.
Materials and Methods: Development of the COVID-19 Ag Respi-Strip resulted
in a ready-to-use ICT assay based on a membrane technology with colloidal gold
nanoparticles using monoclonal antibodies directed against the SARS-CoV and
SARS-CoV-2 highly conserved nucleoprotein antigen. Four hundred observations were
recorded for the analytical performance study and thirty tests were analyzed for the crossreactivity
study. The clinical performance study was performed in a retrospective multicentric
evaluation on aliquots of 328 nasopharyngeal samples. COVID-19 Ag Respi-Strip
results were compared with qRT-PCR as golden standard for COVID-19 diagnostics.
Results: In the analytical performance study, the reproducibility showed a
between-observer disagreement of 1.7%, a robustness of 98%, an overall satisfying user
friendliness and no cross-reactivity with other virus-infected nasopharyngeal samples. In
the clinical performance study performed in three different clinical laboratories during
the ascendant phase of the epidemiological curve, we found an overall sensitivity and
specificity of 57.6 and 99.5%, respectively with an accuracy of 82.6%. The cut-off
of the ICT was found at CT < 22. User-friendliness analysis and risk management
assessment through Ishikawa diagram demonstrate that COVID-19 Ag Respi-Strip may
be implemented in clinical laboratories according to biosafety recommendations.
Conclusion: The COVID-19 Ag Respi-Strip represents a promising rapid SARS-CoV-2
antigen assay for the first-line diagnosis of COVID-19 in 15min at the peak of the
pandemic. Its role in the proposed diagnostic algorithm is complementary to the
currently-used molecular techniques
LSST: from Science Drivers to Reference Design and Anticipated Data Products
(Abridged) We describe here the most ambitious survey currently planned in
the optical, the Large Synoptic Survey Telescope (LSST). A vast array of
science will be enabled by a single wide-deep-fast sky survey, and LSST will
have unique survey capability in the faint time domain. The LSST design is
driven by four main science themes: probing dark energy and dark matter, taking
an inventory of the Solar System, exploring the transient optical sky, and
mapping the Milky Way. LSST will be a wide-field ground-based system sited at
Cerro Pach\'{o}n in northern Chile. The telescope will have an 8.4 m (6.5 m
effective) primary mirror, a 9.6 deg field of view, and a 3.2 Gigapixel
camera. The standard observing sequence will consist of pairs of 15-second
exposures in a given field, with two such visits in each pointing in a given
night. With these repeats, the LSST system is capable of imaging about 10,000
square degrees of sky in a single filter in three nights. The typical 5
point-source depth in a single visit in will be (AB). The
project is in the construction phase and will begin regular survey operations
by 2022. The survey area will be contained within 30,000 deg with
, and will be imaged multiple times in six bands, ,
covering the wavelength range 320--1050 nm. About 90\% of the observing time
will be devoted to a deep-wide-fast survey mode which will uniformly observe a
18,000 deg region about 800 times (summed over all six bands) during the
anticipated 10 years of operations, and yield a coadded map to . The
remaining 10\% of the observing time will be allocated to projects such as a
Very Deep and Fast time domain survey. The goal is to make LSST data products,
including a relational database of about 32 trillion observations of 40 billion
objects, available to the public and scientists around the world.Comment: 57 pages, 32 color figures, version with high-resolution figures
available from https://www.lsst.org/overvie
Medusa y otros cuentos
Este libro reĂșne el esmerado trabajo
creativo de los estudiantes de la electiva
âEl arte de escribir y la creaciĂłn de mundosâ
(2017) de la Universidad CatĂłlica de
Colombia, un espacio académico dedicado
al estudio de textos literarios y de las
herramientas del lenguaje para la creaciĂłn
narrativa. Este espacio, organizado y
apoyado incansablemente por la DirecciĂłn
de Bienestar Universitario, promueve y
cultiva el difĂcil arte de la escritura en los
estudiantes de la Universidad.
En esta publicaciĂłn el lector podrĂĄ hallar
mås que un ejercicio académico, la
exteriorizaciĂłn de las inquietudes artĂsticas
de la comunidad universitaria, las voces de
una generaciĂłn de estudiantes, un esfuerzo
plĂĄstico, un juego de figuras e imĂĄgenes;
en fin, los resultados de varios procesos
creativos.MEDUSA/WILLIAM BALLĂN MARTĂNEZ.
DĂA UTĂPICO/TANIA LUCĂA FONSECA.
LA BELLEZA, EL DESTINO Y LA MUERTE EN URUK /NATALIA ISABEL SERRANO CRUZ.
SOLO UNA CASUALIDAD/MARĂA CAMILA CASTELLANOS ESCOBAR.
HISTORIA DE CACHOS/ EDWIN LEANDRO SUĂREZ GALINDO.
EL BUS/ISABEL ORTEGA BENAVIDES.
EL PISCO QUE ROBĂ MI ZAPATO/KATTY DAYANNA VALENCIA BANGUERA.
ERA SOLO UNA ILUSIĂN/ERIKA DANIELA OROZCO GĂMEZ.
MIS DĂAS DE OLVIDO/LUISA FERNANDA CELIS RAMĂREZ.
ALMAS: EL HOMBRE QUE NO PUDO SER AMADO/JUSTINE VALENTINA BĂEZ LEĂN.
CONSANGUINIDAD: UN FINAL SIN HISTORIA/CARLOS CĂSAR BRICEĂO RAMĂREZ.1a
- âŠ