159 research outputs found
A New Metric for Estimating the Disparity of Antenna Patterns in Synthetic Aperture Imaging Radiometry
The soil moisture and ocean salinity (SMOS) satellite has provided for about ten years systematic passive L -band measurements from space. For several months, phase 0 studies are conducted by the French space agency for a second-generation high resolution (HR) follow-on mission. This contribution is making the connection between this SMOS hr project and the SMOS mission by revisiting the following problematic: the impact of the disparity of the antenna patterns on the reconstruction floor error observed in the retrieved brightness temperatures. This impact is revisited in light of the progress made since that time and a new metric is introduced for estimating the disparity between antenna patterns. It would be helpful for the design of future missions based on imaging by aperture synthesis with interferometric arrays comprising a large number of antennas
Advanced Neuroimaging with Computed Tomography Scanning
International audienceThe x-ray computed tomography (CT) is well known as a useful imaging method and thus CT images have continuingly been used for many applications, especially in medical fields. This book discloses recent advances and new ideas in theories and applications for CT imaging and its analysis. The 16 chapters selected in this book cover not only the major topics of CT imaging and analysis in medical fields, but also some advanced applications for forensic and industrial purposes. These chapters propose state-of-the-art approaches and cutting-edge research results
Chemotherapy of advanced small-bowel adenocarcinoma: a multicenter AGEO study
Les adĂ©nocarcinomes de lâintestin grĂȘle (AIG) sont des tumeurs
rares et de mauvais pronostic à un stade avancé. Les données
publiĂ©es concernant lâefficacitĂ© de la chimiothĂ©rapie palliative sont
peu nombreuses. Le but de notre Ă©tude Ă©tait dâĂ©valuer lâefficacitĂ©
et la tolérance de différents protocoles « modernes » de chimiothérapie
et de comparer lâefficacitĂ© des chimiothĂ©rapies Ă base de
sels de platine dans le traitement de premiÚre ligne des AIG avancés.
Cette étude rétrospective multicentrique a inclus 93 patients
(sexe masculin : 53 % ; ùge médian : 56 ans ; site primitif duodénal
: 53 %) avec un AIG avancé (métastatique : 86 %) traités par
LV5FU2 (n = 10), FOLFOX (n = 48), FOLFIRI (n = 19) ou LV5FU2-
cisplatine (n = 16). Le taux de toxicité grade 3-4 était significativement
plus fréquent dans le groupe de patients traités par
LV5FU2-cisplatine (75 %) comparativement aux autres groupes
de patients (p = 0,001). Les médianes de survie sans progression
(SSP) Ă©taient de 7,7 ; 6,9 ; 6,0 et 4,8 mois (p = 0,16) et les
médianes de survie globale (SG) étaient de 13,5 ; 17,8 ; 10,6 et
9,3 mois (p = 0,25) pour les quatre groupes de patients traités par
LV5FU2, FOLFOX, FOLFIRI et LV5FU2-cisplatine, respectivement.
En analyse multivariĂ©e, lâindice de performance OMS Ă 2
(p < 0,0001) ainsi que des taux Ă©levĂ©s dâACE (p = 0,02) et de CA
19-9 (p = 0,03) avant traitement étaient les seuls facteurs indépendants
significativement associés à un mauvais pronostic.
Dans le sous-groupe de patients traités par sels de platine, ceux
qui ont reçu une chimiothérapie par FOLFOX avaient de meilleures
SSP et SG que les patients traités par LV5FU2-cisplatine. En analyse
multivariée, le traitement par FOLFOX était un facteur significatif
et indépendant de survie prolongée en termes de
SSP (p < 0,0001) et SG (p = 0,02). Ainsi, cette Ă©tude, la plus
grande rapportĂ©e Ă ce jour, suggĂšre dâune part que lâindice de
performance OMS et les taux dâACE et CA 19-9 avant traitement
sont des facteurs pronostiques indĂ©pendants de survie et, dâautre
part que la chimiothérapie par FOLFOX est le traitement de choix
en premiÚre ligne des AIG avancés
Critical Involvement of the ATM-Dependent DNA Damage Response in the Apoptotic Demise of HIV-1-Elicited Syncytia
DNA damage can activate the oncosuppressor protein ataxia telangiectasia mutated (ATM), which phosphorylates the histone H2AX within characteristic DNA damage foci. Here, we show that ATM undergoes an activating phosphorylation in syncytia elicited by the envelope glycoprotein complex (Env) of human immunodeficiency virus-1 (HIV-1) in vitro. This was accompanied by aggregation of ATM in discrete nuclear foci that also contained phospho-histone H2AX. DNA damage foci containing phosphorylated ATM and H2AX were detectable in syncytia present in the brain or lymph nodes from patients with HIV-1 infection, as well as in a fraction of blood leukocytes, correlating with viral status. Knockdown of ATM or of its obligate activating factor NBS1 (Nijmegen breakage syndrome 1 protein), as well as pharmacological inhibition of ATM with KU-55933, inhibited H2AX phosphorylation and prevented Env-elicited syncytia from undergoing apoptosis. ATM was found indispensable for the activation of MAP kinase p38, which catalyzes the activating phosphorylation of p53 on serine 46, thereby causing p53 dependent apoptosis. Both wild type HIV-1 and an HIV-1 mutant lacking integrase activity induced syncytial apoptosis, which could be suppressed by inhibiting ATM. HIV-1-infected T lymphoblasts from patients with inactivating ATM or NBS1 mutations also exhibited reduced syncytial apoptosis. Altogether these results indicate that apoptosis induced by a fusogenic HIV-1 Env follows a pro-apoptotic pathway involving the sequential activation of ATM, p38MAPK and p53
Advanced rotorcraft aeromechanics studies in the French-German SHANEL project
The present paper gives an overview of the SHANEL research project (partly supported by the French DGAC and the German BMWA) which was started at the end of 2006 between the German and French
Aerospace Research Centres DLR and ONERA, the University of Stuttgart and the two national helicopter manufacturers, Eurocopter and Eurocopter Germany. This program represents the continuation of the binational CHANCE project, involving the same partners. The objective of the project is to enhance and further validate the CFD tools: the structured multi-block elsA software of Onera and the unstructured TAU
code of DLR, for computing the aerodynamics of the complete trimmed helicopter, accounting for the blade elasticity by coupling with blade dynamics and structural mechanics tools. A coupling activity between the FLOWer code of DLR and the HOST tool of Eurocopter is also completed to achieve the free flight trim of a complete helicopter. In this program particular attention is being given to wake conservation, to the modelling of elaborated complex shapes such as rotor hubs and consequently to interactional phenomena, with the global objective of improving the prediction of helicopter performance and noise. Rotorcraft noise prediction chains were rationalized, enhanced and compared. The validation activity of the flow solvers elsA and TAU is progressing from the CHANCE results and is now focussing on more complex problems such as the simulation of a rotating rotor head mounted on its fuselage, of a complete helicopter in steady mode through the use of actuator discs and engine boundary conditions, the time-accurate simulation of a complete trimmed helicopter in forward-flight, and the numerical simulation of Blade Vortex Interactions. All along the research program the updated versions of the CFD and acoustic codes are systematically delivered to industry. This approach, also followed during the former CHANCE project, is chosen to speed up the transfer of capabilities to industry and check early enough
that the products meet the expectations for applicability in the industrial environment of Eurocopter
Suivi à long terme d'une cohorte de patients inclus dans un essai randomisé évaluant l'infliximab associé à l'azathioprine dans la maladie de Crohn cortico-dépendante
LE KREMLIN-B.- PARIS 11-BU MĂ©d (940432101) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF
Contribution des sciences de gestion aux politiques publiques. Lâexemple de la âStratĂ©gie Logistique Nationaleâ
International audienceSi lâimpact des sciences de gestion est surtout attendu dans le domaine du management des entreprises, notre communication sâintĂ©resse Ă leur impact sur les politiques publiques, notamment celles qui concernent les Ă©co-systĂšmes dâentreprises. Elle sâappuie sur le cas de la « stratĂ©gie logistique nationale » qui est en cours dâĂ©laboration. AprĂšs avoir retracĂ© la genĂšse de cette stratĂ©gie nationale, la communication montre comment et Ă quel titre des enseignants-chercheurs en sciences de gestion ont contribuĂ© Ă son Ă©mergence avant de participer Ă son processus dâĂ©laboration. Lâanalyse de la nature de leur contribution et de lâĂ©volution de leur rĂŽle dans ce processus invite Ă formuler des questions sur ce type de recherche et, Ă©galement, sur sa reconnaissance par les institutions acadĂ©miques
La conférence nationale de la logistique... et aprÚs?
National audienceLe 8 juillet 2015, le gouvernement français organisait, sous la houlette de 2 ministĂšres (MinistĂšre de lâĂ©cologie, du DĂ©veloppement Durable et de lâEnergie et MinistĂšre de lâEconomie, de lâIndustrie et du NumĂ©rique), la premiĂšre ConfĂ©rence Nationale de la Logistique, qui Ă©tait inscrite dans la loi du 28 mai 2013 (Article 41). Le Cret-Log sâest associĂ© Ă la prĂ©paration de cette confĂ©rence, tant dans lâĂ©laboration du rapport que dans les ateliers thĂ©matiques prĂ©paratoires Ă la confĂ©rence, sans oublier que le dĂ©putĂ© F.-M. Lambert, qui a prĂ©sidĂ© cette ConfĂ©rence, est un ancien diplĂŽmĂ© du Cret-Log ! Pourquoi cette confĂ©rence Ă©tait-elle importante ? Que peut-on en attendre
Co-crystal structure of a dinuclear (Zn-Y) and a trinuclear (Zn-Y-Zn) complexes derived from a Schiff base ligand
The present investigation describes the synthesis and structural study of a metal-zinc ligand [ZnL.H2O], which was used to generate three dimensional supramolecular complex formulated as [Y{Zn(L)(SCN)}(SCN)2].[Y{Zn(L)(SCN)}2(DMF)2].(NO3). The title compound crystallizes in the triclinic space group P-1 with the following unit cell parameters: a = 14.8987(7) Ă
, b = 15.6725(8) Ă
, c = 19.2339(10) Ă
, a = 94.610(4)°, ÎČ = 103.857(4)°, Îł = 101.473(4)°, V = 4234.4(4) Ă
3, Z = 2, R1 = 0.063 and wR2 = 0.96. For this compound, the structure reveals that one heterodinuclear unit [Y{Zn(L)(SCN)}(SCN)2] is co-crystallized with a heterotrinuclear unit [Y{Zn(L)(SCN)}2(DMF)2].(NO3). In the dinuclear moiety, the organic molecule acts as a hexadentate ligand and in the trinuclear unit, it acts as a pentadentate ligand with one of the oxygen methoxy group remaining uncoordinated. In both units the coordination environment of the zinc metal can be described as distorted square pyramidal. In the dinuclear unit the Y(III) is hexacoordinated while it is octacoordinated in the trinuclear unit. The environment of the Y(III) can be described as a distorted octahedral geometry in the dinuclear and as a distorted square antiprism in the trinuclear units respectively
- âŠ