检索结果-南通市图书馆

Onto Orthogonal Projections in the Space of Polynomials P_n[x]

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2023年第1期11卷 22-45页

作者： jean-francois Niglio Department of Mathematics Kingston University London UK

In this article, I consider projection groups on function spaces, more specifically the space of polynomials Pn[x]. I will show that a very similar construct of projection operators allows us to project into the subspaces of Pn[x] where the function h ∈Pn[x] represents the closets function to f ∈Pn[x] in the least square sense. I also demonstrate that we can generalise projections by constructing operators i.e. in Rn+1 using the metric tensor on Pn[x]. This allows one to project a polynomial function onto another by mapping it to its coefficient vector in Rn+1. This can be also achieved with the Kronecker Product as detailed in this paper.

关键词： Polynomials and Projections Projections The Kronecker Product Idempotent Operators

Impact of time to diagnosis on the occurrence of cardiogenic shock in MIS‑C post‑COVID-19 infection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2023年第6期19卷 595-604页

作者： Said Bichali Mathilde Bonnet Marie‑Emilie Lampin jean‑Benoit Baudelet Heloise Reumaux Olivia Domanski Thameur Rakza Alexandre Delarue Morgan Recher Jerome Soquet francois Dubos Stephane Leteurtre Ali Houeijeh francois Godart Pediatric Cardiology Univ.LilleCHU Lille2 Avenue Oscar Lambret59000 LilleFrance Pediatric Intensive Care Univ.LilleCHU Lille59000 LilleFrance ULR 2694‑Metrics:Evaluation des Technologies de Sante et des Pratiques Medicales Univ.Lille59000 LilleFrance Pediatric Rhumatology Univ.LilleCHU Lille59000 LilleFrance Cardiac Surgery Univ.LilleCHU Lille59000 LilleFrance Pediatric Emergency Univ.LilleCHU Lille59000 LilleFrance

Background In multisystem inflammatory syndrome in children(MIS-C),diagnostic delay could be associated with *** study aims to measure the time to diagnosis in MIS-C,assess its impact on the occurrence of cardiogenic shock,and specify its *** A single-center prospective cohort observational study was conducted between May 2020 and July 2022 at a tertiary care *** meeting the World Health Organization MIS-C criteria were included.A long time to diagnosis was defined as six days or *** on time to diagnosis were collected by two independent *** primary outcome was the occurrence of cardiogenic *** regression and receiver operating characteristic curve analysis were used for outcomes,and a Cox proportional hazards model was used for *** Totally 60 children were assessed for inclusion,and 31 were finally analyzed[52%males,median age 8.8(5.7-10.7)years].The median time to diagnosis was 5.3(4.2-6.2)*** univariable analysis,age above the median,time to diagnosis,high C-reactive protein,and high N-terminal pro-B-type natriuretic peptide(NT-proBNP)were associated with cardiogenic shock[odds ratio(OR)6.13(1.02-36.9),2.79(1.15-6.74),2.08(1.05-4.12),and 1.70(1.04-2.78),respectively].In multivariable analysis,time to diagnosis≥6 days was associated with cardiogenic shock[adjusted OR(aOR)21.2(1.98-227)].Time to diagnosis≥6 days had a sensitivity of 89% and a specificity of 77% in predicting cardiogenic shock;the addition of age>8 years and NT-proBNP at diagnosis≥11,254 ng/L increased the specificity to 91%.Independent determinants of short time to diagnosis were age<8.8 years[aHR 0.34(0.13-0.88)],short distance to tertiary care hospital[aHR 0.27(0.08-0.92)],and the late period of the COVID-19 pandemic[aHR 2.48(1.05-5.85)].Conclusions Time to diagnosis≥6 days was independently associated with cardiogenic shock in *** diagnosis and treatment are crucial to avoid the use of inotropes and

关键词： COVID-19 Delay in diagnosis Heart failure MIS-C SARS-CoV-2

Informational Polymers with Precise Carbamate Sequences

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Precision Chemistry 2023年第8期1卷 480-484页

作者： Itab Youssef Svetlana Samokhvalova Isaure Sergent Laurence Charles jean-francois Lutz Universite de Strasbourg CNRSISIS67000 StrasbourgFrance Universite de Strasbourg CNRSInstitut Charles Sadron UPR2267034 Cedex 2 StrasbourgFrance Aix Marseille Universite CNRSUMR 7273Institute of Radical Chemistry13397 Cedex 20 MarseilleFrance

Sequence-defined oligocarbamates were synthesized by orthogonal iterative chemistry on a modified Wang solid *** this approach,amino alcohol building blocks,containing either primary or secondary amines,were used in order to obtain ondemand either a classical urethane motif−NH−CO−O−or a Nsubstituted urethane linkage−NR−CO−O−.Hence,aperiodic carbamate sequences could be easily prepared in this *** with different monomer sequences and chain-length were *** by NMR,SEC and ESI-MS indicated formation of near-monodisperse ***,these informational oligocarbamates were sequenced by MS/*** interestingly,it was found that a fully orthogonal fragmentation of−NH−CO−O−urethane motifs occurs in these macromolecules.

关键词： Sequence-controlled polymers Information-containing polymers Sequencing Solid-phase synthesis Mass spectrometry

Computation of Shock Profiles in Radiative Hydrodynamics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2009年第10期6卷 1118-1136页

作者： jean-francois Coulombel Pauline Lafitte CNRS Laboratoire Paul Painleve and Project Team SIMPAF INRIA FutursUniversite Lille 1Cite Scientifique59655 VILLENEUVE D’ASCQ CedexFrance Laboratoire Paul Painleve and Project Team SIMPAF INRIA Futurs Universite Lille 1Cite Scientifique59655 VILLENEUVE D’ASCQ CedexFrance

This article is devoted to the construction of a numerical scheme to solve the equations of radiative *** use this numerical procedure to compute shock profiles and illustrate some earlier theoretical results about their smoothness and monotonicity *** first consider a scalar toy model,then we extend our analysis to a more realistic system for the radiative hydrodynamics that couples the Euler equations and an elliptic equation.

关键词： Radiative transfer shock profiles Euler equations numerical profiles

Oil Strategies Benefits over Different Driving Cycles using Numerical Simulation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2017年第4期26卷 371-377页

作者： Hanna SARA David CHALET Mickael CORMERAIS jean-francois HETET Ecole Centrale de Nantes LHEEA lab.(ECN/CNRS)NantesFrance MANN+HUMMEL France LavalFrance

95 g/km is the allowed quantity of CO_2 emission normalized to NEDC to be set in 2020. In addition, NEDC will be replaced by more severe driving cycles and will be united worldwide. To respond to those criteria, automotive industries are working on every possible field. Thermal management has been proved to be effective in reducing fuel consumption. Cold start is a primordial reason of overconsumption, as the engine highest efficiency is at its optimal temperature. At cold start, the engine's oil is at its lowest temperature and thus its higher viscosity level. A high viscosity oil generates more friction, which is one of the most important heat losses in the engine. In this paper, hot oil storage is studied. Numerical simulations on GT-suite model were done. The model consists of a 4-cylinder turbocharged Diesel engine using a storage volume of 1 liter of hot oil. Ambient temperature variation were taken into consideration as well as different driving cycles. Furthermore, different configurations of the thermal strategy(multifunction oil sump) were proposed and evaluated. Lubricant temperature and viscosity profiles are presented in the article as well as fuel consumption savings for different configurations, driving cycles and ambient temperatures.

关键词：行驶工况数值模拟石油战略周期发动机用效益排放标准最佳温度

Are multidisciplinary consultation meetings for prenatal diagnosis achievable in a low-income country? A descriptive cross-sectional survey in Benin

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatric Surgery 2023年第4期6卷 270-275页

作者： Monsoia Gildas Yassegoungbe Beaudelaire Romulus Assan Amoussou Sedjro Clotaire Romeo Houegban Codjo Serge Metchihoungbe jean-francois Lecompte Christine Tschabu Aguemon Sidoine Bitho Gbetey jean Breaud Antoine Seraphin Gbenou Pediatric Surgery Department Mother and Child Teaching Hospital LaguneUniversity of Abomey-CalaviCotonouBenin Pediatric Surgery Department National Teaching Hospital Hubert Koutoukou MagaUniversity of Abomey-CalaviCotonouBenin Pediatric Surgery Department CHU-LENVAL Paediatric Hospitals of NiceNiceFrance University Clinic of Gynecological Obstetrics National Teaching Hospital Hubert Koutoukou MagaUniversity of Abomey-CalaviCotonouBenin Intellectual Production Department Center of Expertise in Applied Social SciencesCotonouBenin

Objective The multidisciplinary antenatal diagnosis staff bring together practitioners who are involved in the management of the antenatal period at *** project was designed following the French experience to institute multidisciplinary consultation meetings for prenatal diagnosis(MCMPD)in *** This is a descriptive cross-sectional study examining the knowledge,attitudes,and practices of Beninese practitioners in the field of MCMPD to develop the pilot phase of the *** We collected 108 participants from different *** and pediatric surgeons were in the majority at 23.9% and 16.5%,***-seven percent of participants were from the public sector(n=75).One practitioner felt that it was not a good idea to implement these *** all staff(96.2%)agreed that this meeting would have a positive impact on reducing neonatal ***(58.5%),spina bifida aperta(43.6%),and gastroschisis(34%)were the most commonly diagnosed antenatal conditions in *** neonatal pathology required medical termination of the pregnancy according to 35.6% of the *** The objective of reducing infant mortality due to medical and surgical pathologies is a noble one and deserves to be *** innovative project,developed through this study,the first of its kind in the subregion,will contribute inexorably to the achievement of the third Goal Sustainable Development.

关键词： diagnosis sectional income

Simple Fabrication and Characterization of Discontinuous Carbon Fiber Reinforced Aluminum Matrix Composite for Lightweight Heat Sink Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2014年第4期27卷 714-722页

作者： Hiroki Kurita Emilien Feuillet Thomas Guillemet jean-Marc Heintz Akira Kawasaki jean-francois Silvain DEN/DANS/DMN/SRMA/LTMEx CEA SaclayGif-sur-YvetteFrance Institute of Condensed Matter Chemistry of Bordeaux BordeauxFrance Department of Materials Processing Graduate School of EngineeringTohoku University

The constant increase in power and heat flux densities encountered in electronic devices fuels a rising demand for lightweight heat sink materials with suitable thermal *** this study,discontinuous pitch-based carbon fiber reinforced aluminum matrix（Al-CF） composites with aluminum–silicon alloy（Al–Si） were fabricated through hot *** small amount of Al–Si contributed to enhance the sintering process in order to achieve fully dense Al–CF composites.A thermal conductivity and CTE of 258 W/（m K） and 7.0 9 10-6/K in the in-plane direction of the carbon fibers were obtained for a（Al95 vol%＋ Al–Si5 vol%）-CF50 vol%*** fiber provides the reducing of CTE while the conservation of thermal conductivity and weight of *** achieved CTEs satisfy the standard requirements for a heat sink material,which furthermore possess a specific thermal conductivity of 109 W cm3/（m K g）.This simple process allows the low-cost fabrication of Al–CF composite,which is applicable for a lightweight heat sink material.

关键词： Carbon fiber Metal-matrix composites(MMCs) Thermal properties Powder processing

Multiplexing technology for in vitro diagnosis of pathogens： the key contribution of phosphorus dendrimers

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2018年第11期61卷 1454-1461页

作者： jean Pierre Majoral jean Marie francois Richard Fabre Alice Senescau Serge Mignani Anne-Marie Caminade Laboratoire de Chimie de Coordination du CNRS 31077 Toulouse Cedex 4 France LCC-CNRS Universite de Toulouse CNRS Toulouse France Dendris 31670 Labege France LISBP UMR CNRS 5504 INRA 792 31077 Toulouse Cedex 04 France Universite Paris Descartes PRES Sorbonne Paris Cite CNRS-UMR 860 Laboratoire de Chimie et de Biochimie Pharmacologiques et Toxicolgique 75006 Paris France

After the microbiology based on Pasteur's method and polymerase chain reaction(PCR), the diagnosis company named Dendris has proposed a third-generation of diagnosis enabling the search of a broad range of pathogens with strong sensitivity and specificity. This extraordinary profile was possible thanks to the use of phosphorus dendrimers for which various techniques of deposition on a given support were investigated and described and analyzed in this report.

关键词：聚合酶链反应微生物学发展现状医疗卫生行业

Cross-sectional associations between cortical thiclmess and physical activity in older adults with spontaneous memory complaints:The MAPT Study

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2023年第3期12卷 324-332页

作者： Jérémy Raffin Yves Rolland Clara Fischer jean-francois Mangin Audrey Gabelle Bruno Vellas Philipe de Souto Barreto the MAPT/DSA Group Gérontopôle de Toulouse Institut du VieillissementCentre Hospitalo-Universitaire de ToulouseToulouse 31000France UniversitéPaul-Sabatier/Institut National de la Santéet de la Recherche Médicale UnitéMixte de Recherche 1027 Facultéde médecineUniversity of Toulouse ⅢToulouse 31000France Centre pour l'Acquisition et le Traitement des Images Multicenter Neuroimaging Platform NeurospinUniversitéParis-SaclayGif sur Yvette 91191France Memory Resources and Research Center Montpellier University HospitalMontpellier 34295France Institut National de la Santéet de la Recherche Médicale Unité1061 i-site Montpellier Universitéd'Excellence University of MontpellierMontpellier 34090France 不详

Background:Age-related changes in brain structure may constitute the starting point for cerebral function *** activity(PA)demonstrated favorable associations with total brain volume,but its relationship with cortical thickness(CT)remains *** investigated the cross-sectional associations between PA level and CT in community-dwelling people aged 70 years and ***:A total of 403 older adults aged 74.8±4.0 years(mean±SD)who underwent a baseline magnetic resonance imaging examination and who had data on PA and confounders were *** was assessed with a *** were categorized according to PA *** linear regressions were used to compare the brain CT(mm)of the inactive group(no PA at all)with 6 active groups(growing PA levels)in 34 regions of ***:Compared with inactive persons,people who achieved PA at a level of 1500-1999 metabolic equivalent task-min/week(i.e.,about6-7 h of brisk walking for exercise) and those who achieved it at 2000-2999 metabolic equivalent task-min/week(i.e.,8-11 h of brisk walking for exercise)had higher CT in the fusiform gyrus and the temporal ***,dose-response associations between PA and CT were found in the fusiform gyrus(B=0.011,SE=0.004,adj.p=0.035),the temporal pole(B=0.026,SE=0.009,adj.p=0.048),and the caudal middle frontal gyrus,the entorhinal,medial orbitofrontal,lateral occipital,and insular ***:This study demonstrates a positive association between PA level and CT in temporal areas such as the fusiform gyrus,a brain region often associated to Alzheimer’s disease in people aged 70 years and *** investigations focusing on PA type may help to fulfil remaining knowledge gaps in this field.

关键词： Alzheimer's disease Brain aging Cortical thickness Physical activity