检索结果-南通市图书馆

Nano Research 2018年第11期11卷 6074-6085页

作者： Julien Ramade nicolas Troc Olivier Boisron Michel Pellarin Marie-Ange Lebault Emmanuel Cottancin Vitor T. A. Oiko Rafael Cabreira Gomes Varlei Rodrigues Matthias Hillenkamp Univ. Lyon Universitd Claude Bernard Lyon I CNRS UMR5306 Institut Lumiee Matiee t=-69622 Villeurbanne France Instituto de F[sica Gleb Wataghin UNICAMP CP 6165 13083-970 Campinas SP Brazil

The prospect of combining both magnetic and plasmonic properties in a single nanoparticle promises both valuable insights on the properties of such systems from a fundamental viewpoint and numerous possibilities for technological applications. However, the combination of two of the most prominent metallic candidates—iron and silver—has presented numerous experimental difficulties because their thermodynamic properties impede miscibility and even coalescence. Herein, we present the thorough characterization of physically prepared Fe50Ag50 nanoparticles embedded in carbon and silica matrices via electron microscopy, optical spectroscopy, magnetometry and synchrotron-based X-ray spectroscopy. Iron and silver segregate completely into structures resembling fried eggs, with a nearly spherical, crystallized silver part surrounded by an amorphous structure of iron carbide or oxide, depending on the environment of the particles. Consequently, the particles exhibit both plasmonic absorption corresponding to the silver nanospheres in an oxide environment and a reduced but measurable magnetic response. The suitability of such nanoparticles for technological applications is discussed from the viewpoint of their high chemical reactivity with their environment.

关键词： nanoalloy bimetallic nanoparticles iron silver FeAg optical spectroscopy magnetometry

Enhanced dielectric and electrocaloric properties in lead-free rod-like BCZT ceramics

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 Advanced Ceramics 2020年第2期9卷 210-219页

作者： Zouhair HANANI Soukaina MERSELMIZ Abdelaadim DANINE nicolas STEIN Daoud MEZZANE M’barek AMJOUD Mohammed LAHCINI Yaovi GAGOU Matjaz SPREITZER Damjan VENGUST Zdravko KUTNJAK Mimoun El MARSSI Igor ALUK'YANCHUK Mohamed GOUNE IMED-Lab Cadi Ayyad UniversityMarrakesh 40000Morocco ICMCB University of 1.BordeauxPessac 33600France IJL University of LorraineNancy 54000France UM6P Ben Guerir 43150Morocco LPMC University of Picardy Jules VerneAmiens 80039France Jozef Stefan Institute Ljubljana 1000Slovenia Physics Faculty Southern Federal UniversityRostov-on-Don 344090Russia

Ba0.85Ca0.15Zr0.10Ti0.90O3(BCZT)lead-free ceramics demonstrated excellent dielectric,ferroelectric,and piezoelectric properties at the morphotropic phase boundary(MPB).So far,to study the effect of morphological changes on dielectric and ferroelectric properties in lead-free BCZT ceramics,researchers have mostly focused on the influence of spherical grain shape *** this study,BCZT ceramics with rod-like grains and aspect ratio of about 10 were synthesized by surfactant-assisted solvothermal route.X-ray diffraction(XRD)and selected area electron diffraction(SAED)performed at room temperature confirm the crystallization of pure perovskite with tetragonal *** electron microscopy(SEM)image showed that BCZT ceramics have kept the 1D rod-like grains with an average aspect ratio of about ***-like BCZT ceramics exhibit enhanced dielectric ferroelectric(εr=11,906,tanδ=0.014,Pr=6.01μC/cm^2,and Ec=2.46 kV/cm),and electrocaloric properties(ΔT=0.492 K andz=0.289(K×mm)/kV at 17 kV/cm)with respect to spherical BCZT ***,rod-like BCZT lead-free ceramics have good potential to be used in solid-state refrigeration technology.

关键词： lead-free Ba0.85Ca0.15Zr0.10Ti0.90O3(BCZT) rod-like Ba0.85Ca0.15Zr0.10Ti0.90O3(BCZT) dielectric ferroelectric electrocaloric effect

Moisture-Induced Non-Equilibrium Phase Segregation in Triple Cation Mixed Halide Perovskite Monitored by In Situ Characterization Techniques and Solid-State NMR

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2023年第2期6卷 185-194页

作者： Mohammad Ali Akhavan Kazemi nicolas Folastre Parth Raval Michel Sliwa Jean Marie Vianney Nsanzimana Sema Golonu Arnaud Demortiere Jean Rousset Olivier Lafon Laurent Delevoye G.N.Manjunatha Reddy Frédéric Sauvage Laboratoire de Réactivité et Chimie des Solides(LRCS) UMR CNRS 7314-Institut de Chimie de Picardie FR 3085Université de Picardie Jules Verne33 rue Saint LeuAmiens Cedex FR-80039France CNRS Centrale LilleUMR 8181UCCSUnitéde Catalyse et Chimie du SolideUniversité de LilleUniversitéd’ArtoisLille F-59000France UMR 8516-LASIRE-Laboratoire de Spectroscopie pour les Interactions la Réactivité et l’EnvironnementCNRSUniversitéde LilleLille F-59000France EDF R&D EDF LabBoulevard Gaspard MongePalaiseau 91120France

Environmental stability is a major bottleneck of perovskite solar *** a handful of studies are investigating the effect of moisture on the structural degradation of the *** mostly rely on ex situ experiments and on completely degraded samples,which restrict the assessment on initial and final *** combining in situ X-ray diffraction under controlled 85%relative humidity,and live observations of the water-induced degradation using liquid-cell transmission electron microscopy,we reveal two competitive degradation paths leading on one hand to the decomposition of state-of-theart mixed cation/anion(Cs_(0.05)(MA_(0.17)FA_(0.83))_(0.95)Pb(Br_(0.17)I_(0.83))_(3)(CsMAFA)into PbI_(2) through a dissolution/recrystallization mechanism and,on the other hand,to a non-equilibrium phase segregation leading to CsPb_(2)Br_(5) and a Cesium-poor/iodide-rich Cs_(0.05)-x(MA_(0.17)FA_(0.83))_(0.95)Pb(Br_(0.17-2y)I_(0.83)+2y)_(3) *** degradation mechanism is corroborated at atomic-scale resolution through solid-state ^(1)H and ^(133)Cs NMR *** to moisture leads to a film containing important heterogeneities in terms of morphology,photoluminescence intensities,and *** results provide new insights and consensus that complex perovskite compositions,though very performant as champion devices,are comparatively metastable,a trait that limits the chances to achieve long-term stability.

关键词： liquid-cell transmission electron microscopy moisture degradation perovskite stability phase segregation solid-state NMR

EUV/Soft X-ray Multilayer Optics

在线全文

学校读者我要写书评

暂无评论

EUV/Soft X-Ray Multilayer Optics

Daily Variability of Radon Gas in Brazilian Tropics Near Ground Level Surface

Photonics Asia 2004;Optoelectronics,Microelectronics,and Nanotech

作者： Sergiy Yulin Torsten Feigl nicolas Benoit Norbert Kaiser Fraunhofer-Institut für Angewandte Optik und Feinmechanik Albert-Einstein-Str. 7 07745 Jena Germany Fraunhofer-Institut für Angewandte Optik und Feinmechanik Albert-Einstein-Str. 7 07745 Jena Germany Fraunhofer-Institut für Angewandte Optik und Feinmechanik Albert-Einstein-Str. 7 07745 Jena Germany Fraunhofer-Institut für Angewandte Optik und Feinmechanik Albert-Einstein-Str. 7 07745 Jena Germany

Most applications of Mo/Si multilayer optics in Extreme ultraviolet lithography (EUVL) require a high normal incidence reflectivity. Using dc magnetron sputtering we achieved R = 68.8 % @ λ = 13.45 nm

关键词： EUV, Mo/Si, barrier layers, interface-engineered mirrors, thermal stability, broadband mirror, narrowband mirror, laterally graded coatings.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(A) 2015年第10期4卷 516-521页

作者： Inacio Malmonge Martin Marcelo Pego Gomes Bogos Nubar Sismanoglu nicolas Cruvinel Lindo Department of Physics Technological Institute of Aeronautics Sao Jose dos Campos 12228-900 Brazil

By monitoring the ionizing radiation from minute to minute in S^o Jos6 dos Campos, SP, Brazil （230 S, 450 W） using Geiger counter, during January to August 2015, it has confirmed the presence of radon gas in these measures. The observation confirms the existence of a periodicity of 24 hours through the technique （Fast Fourier Transform） applied to the data set, and this cycle can be better visible in longer dry periods. On rainy days or with heavy fog in the region, this periodicity is modified or even disappears. As Geiger do not detect alpha particles due to absorption in the walls of the sensor tube, it measured X and gamma rays coming from the radon gas progeny. Radon gas （222Rn） has a half-life of 19.7 minutes to decays in 214Bi emitting gamma ray energy （45%） with 0.609 MeV which is monitored daily by Geiger. Also 222Rn decays in 26.8 minutes in 214pb giving （37%） with 0.35 MeV and others with less energy. It is confirmed the good performance ofa Geiger tube with LND 712 working with about 500 VDC rated voltage.

关键词： Geiger radon gas ionizing radiation.

Polarization-robust mid-infrared carpet cloak with minimized lateral shift

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2021年第6期9卷 944-949页

作者： YAO HUANG JINGJING ZHANG JINHUI ZHOU BO QIANG ZHENGJI XU LIN LIU JIFANG TAO nicolas KOSSOWSKI QIJIE WANG YU LUO School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China Electrical Engineering Kulicke&Soffa Pte.Ltd.Singapore 554369Singapore School of Microelectronics Science and Technology Sun Yat-sen UniversityZhuhai 519082China School of Information and Engineering Shandong UniversityQingdao 266237China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore

With the advent and rapid development of the transformation optics and metamaterials,invisibility cloaks have captivated much attention in recent *** most cloaking schemes suffer from limited bandwidth,the carpet cloak,which can hide an object on a reflecting plane,can operate over a broadband frequency ***,the carpet cloaks experimentally realized thus far still have several *** example,the quasi-conformal mapping carpet cloak leads to a lateral shift of the reflected light ray,while the birefringent carpet cloak only works for a specific *** this work,we propose a conformal transformation scheme to tackle these two problems *** an example,we design a mid-infrared carpet cloak in a silicon platform and demonstrate its polarization-insensitive property as well as the minimized lateral shift over a broad frequency band from 24 to 28.3 THz.

关键词： polarization conformal Polarization

Competing magnetic states in silicene and germanene 2D ferromagnets

在线全文

学校读者我要写书评

暂无评论

Nano Research 2020年第12期13卷 3396-3402页

作者： Dmitry V.Averyanov Ivan S.Sokolov Mikhail S.Platunov Fabrice Wilhelm Andrei Rogalev Pierluigi Gargiani Manuel Valvidares nicolas Jaouen Oleg E.Parfenov Alexander N.Taldenkov Igor A.Karateev Andrey M.Tokmachev Vyacheslav G.Storchak National Research Center“Kurchatov Institute” Kurchatov Sq.1Moscow123182Russia ESRF-The European Synchrotron CS 4022038043Grenoble Cedex 9France ALBA Synchrotron Light Source Cerdanyola del Vallès08290BarcelonaSpain L’Orme des Merisiers Synchrotron SOLEILGyf-sur-Yvette91192France

Two-dimension(2D)magnets have recently developed into a class of stoichiometric materials with prospective applications in ultra-compact spintronics and quantum *** functionality is particularly rich when different magnetic orders are competing in the same *** REX2(RE=Eu,Gd;X=Si,Ge),silicene or germanene—heavy counterparts of graphene—coupled with a layer of rare-earth metals,evolve from three-dimension(3D)antiferromagnets in multilayer structures to 2D ferromagnets in a few *** evolution,however,does not lead to fully saturated 2D ferromagnetism,pointing at a possibility of coexisting/competing magnetic ***,REX2 magnetism is explored with element-selective X-ray magnetic circular dichroism(XMCD).The measurements are carried out for GdSi2,EuSi2,GdGe2,and EuGe2 of different thicknesses down to 1 monolayer employing K absorption edges of Si and Ge as well as M and L edges of the *** access the magnetic state in REX2 and determine the seat of magnetism,orbital,and spin contributions to the magnetic ***-field measurements probe remnants of the bulk antiferromagnetism in 2D *** results provide a new platform for studies of complex magnetic structures in 2D materials.

关键词： silicene germanene 2D ferromagnetism X-ray magnetic circular dichroism(XMCD) monolayer

Fatal Legionella pneumophila serogroup 1 pleural empyema:A case report

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 Critical Care Medicine 2019年第6期8卷 99-105页

作者： Francois Maillet nicolas Bonnet Typhaine Billard-Pomares Fatma El Alaoui Magdoud Yacine Tandjaoui-Lambiotte Intensive Care Unit Avicenne HospitalAssistance Publique-Hoitaux de ParisBobigny 93000France Paris XIII University Bobigny 93000France Microbiology Department Avicenne HospitalAssistance Publique H-oitaux de ParisBobigny 93000France Microbiology Department Jean Verdier HospitalAssistance Publique-Hoitaux de ParisBondy 93140France

BACKGROUND Legionella pneumophila(***)is a gram-negative intracellular bacillus composed of sixteen different *** is mostly known to cause pneumonia in individuals with known risk factors as immunocompromised status,tobacco use,chronic organ failure or age older than 50 *** parapneumonic pleural effusion is frequent in legionellosis,pleural empyema is very *** this study,we report a case of fatal pleural empyema caused by *** serogroup 1 in an 81-year-old man with multiple risk *** SUMMARY An 81-year-old man presented to the emergency with a 3 wk dyspnea,fever and left chest *** previous medical conditions were chronic lymphocytic leukemia,diabetes mellitus,chronic kidney failure,hypertension and hyperlipidemia,without tobacco *** X-ray and comouted tomographyscan confirmed a large left pleural effusion,which puncture showed a citrine exudate with negative standard bacterial *** intravenous cefotaxime antibiotherapy,patient’s worsening condition after 10 d led to thoracocentesis and evacuation of 2 liters of *** patient progressively developed severe hypoxemia and multiorgan failure *** patient was treated by antibiotherapy with cefepime and amikacin and with adequate symptomatic shock treatment,but died of uncontrolled *** next day,cultures of the surgical pleural liquid samples yielded *** serogroup 1,consistent with the diagnosis of pleural *** *** should be considered in patients with multiple risk factors and undiagnosed pleural empyema unresponsive to conventional antibiotherapy.

关键词： Legionella pneumophila serogroup 1 Legionellosis Legionnaire’s disease Pleural empyema Case report

Crystallographic Study of Uranium-Thorium Bearing Minerals in Tranomaro,South-East Madagascar

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 Minerals and Materials Characterization and Engineering 2013年第6期1卷 347-352页

作者： Frank Elliot Sahoa Naivo Rabesiranana Raoelina Andriambololona nicolas Finck Christian Marquardt Hörst Geckeis Institut National des Sciences et Techniques Nucléaires(Madagascar-INSTN) AntananarivoMadagascar Institute of Nuclear Waste and Disposal(INE) Karlsruhe Institute of Technology(KIT)KarlsruheGermany

Studies are undertaken to characterize the uranium and thorium minerals of south-east Madagascar. Seven selected uranothorianite bearing pyroxenites samples from old abandoned uranium quarries in Tranomaro, south Amboasary, Madagascar (46°28'00"E, 24°36'00"S) have been collected. To determine the mineral micro-structure, they were investigated for qualitative identification of crystalline compounds by using X-ray powder diffraction analytical method (XRD). Results showed that the uranium and thorium compounds, as minor elements, were present in various crystalline structures. Thorium, as thorianite, is present in a simple ThO2 cubic crystalline system, whereas the uranium component of the Tranomaro uranothorianite samples is oxide-based and is a mixture of complex oxidation states and crys-talline systems. Generally called uraninite, its oxide compounds are present in more than eight phases.

关键词： Tranomaro Madagascar Uranothorianite Crystallography XRD

Genetic causes of macrozoospermia and proposal for an optimized genetic diagnosis strategy based on sperm parameters

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 Genetics and Genomics 2023年第7期50卷 536-540页

作者： Alicia Coudert Caroline Cazin Amir Amiri-Yekta Selima Fourati Ben Mustapha Raoudha Zouari Julien Bessonat Abdelali Zoghmar Antoine Clergeau Catherine Metzler-Guillemain Chema Triki Herve Lejeune Nathalie Sermondade Eva Pipiras Nadia Prisant Isabelle Cedrin Leila Keskes Florence Lestrade Laetitia Hesters Nathalie Rives Beatrice Dorphin Agnes Guichet Catherine Patrat Emmanuel Dulioust Aur elie Feraille Franc ois Robert Eric Bieth Arthur Sorlin Jean-Pierre Siffroi Mariem Ben Khelifa Florence Boiterelle Sylvianne Hennebicq Veronique Satre Christophe Arnoult Charles Coutton Anne-Laure Barbotin nicolas Thierry-Mieg Zine-Eddine Kherraf Pierre F.ray Genetic Epigenetic and Therapies of Infertility Team Institute for Advanced BiosciencesInserm U 1209CNRS UMR 5309Universite Grenoble Alpes38000GrenobleFrance CHU Grenoble Alpes UM GI-DPI38000GrenobleFrance CHU Grenoble Alpes UM de Genetique Chromosomique38000GrenobleFrance Department of Genetics Reproductive Biomedicine Research CenterRoyan Institute for Reproductive BiomedicineACECRTehranIran Polyclinique les Jasmins Centre d’Aide M edicale a la Procr eationCentre Urbain Nord1003TunisTunisia CHU Grenobles Alpes UF de Biologie de la Procr eation38000GrenobleFrance Reproduction Sciences and Surgery Clinique Ibn RochdConstantineAlgeria CHU Caen CECOS de CaenD epartement de BiologieUnit e de Biologie de la Reproduction14033CaenFrance APHM Hopital La-Conception P^ole Femmes-parents-enfantsCentre Clinico-biologique d’assistance M edicale a la Procr eation-CECOS13385 MarseilleFrance Aix-Marseille Univ InsermMMGU125113385 Marseille Medical Genetics13385 MarseilleFrance Clinique Hannibal Centre d’AMPLes Berges du Lac1053TunisTunisia Reproductive Medicine Department Hospices Civil de LyonLyonFrance Hopital Jean Verdier Universit e Sorbonne Paris NordParisFrance CHU de Pointe-a-Pitre/Abymes GuadeloupeFrance Service de Medecine de la Reproduction CHU Jean VerdierParisFrance Faculte de M edecine de Sfax SfaxTunisia CHR Metz-Thionville Service d’Assistance Medicale a la Procr eation57530Ars-LaquenexyFrance Unit of Reproductive Biology Antoine B ecl ere University HospitalUniversity Paris SudClamartParis-Sud UniversityLe Kremlin Bic^etreFrance Univ Rouen Normandie Inserm U1239NorDICAdrenal and Gonadal PathophysiologyReproductive Biology Laboratory-CECOSRouen University Hospital76031Rouen CedexFrance CHAL Centre Hospitalier Alpes Leman Centre AMP7474130Contamine-sur-ArveFrance CHU Angers Service de Gen etique49933AngersINSERM U1083France Service de Biologie de la Reproduction-CECOS Hopital Cochin 74014ParisFrance IRH Medicentre Clinique du Val d’Ouest39

Macrozoospermia,characterized by the presence of largeheaded spermatozoa usually carrying several flagella,is one of the most severe phenotypes of male *** in most cases,the gametes are chromosomally abnormal and cannot be used for assisted reproductive technologies(ART)(ray et al.,2017).In 2007,subjects from consanguineous families were shown to carry the same homozygous deleterious AURKC variant(NM_001015878.2:c.144delC,later renamed c.145delC,***49TrpfsTer23),establishing AURKC as the first and main gene associated with macrozoospermia(Dieterich et al.,2007).Using flow cytometry,all spermatozoa from patients homozygous for the c.145delC variant were shown to be tetraploid,highlighting a cytokinesis blockage of the first meiotic divisions thus confirming that ART cannot be successful for these patients(Dieterich et al.,2009).

关键词： diagnosis establishing