检索结果-南通市图书馆

Luminescent-plasmonic core-shell microspheres,doped with nd3+ and modified with gold nanoparticles,exhibiting whispering gallery modes and SERS activity

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 Rare Earths 2019年第11期37卷 1152-1156页

作者： Marcin Runowski Inocencio R.martin Vladimir n.Sigaev Vitaliy I.Savinkov Georgiy Yu.Shakhgildyan Stefan Lis Faculty of Chemistry Adam Mickiewicz UniversityUniwersytetu Poznanskiego 861-614 PoznanPoland Departamento de Fisica Instituto de Materiales y Nanotecnologia(IMN)Universidad de La LagunaApdo.456E-38200 San Cristobal de La LagunaSanta Cruz de TenerifeSpain D.Mendeleev University of Chemical Technology Miusskaya Sq.9125047 MoscowRussia

Multifunctional core/shell type,luminescent-plasmonic material composed of lanthanide doped microspheres(≈50μm)and gold nanoparticles(Au nPs;≈10-20 nm)deposited onto their surface,were successfully prepared(nd^3+:YAS@Au).The material was synthesized to combine the luminescence properties of the nd^3+-doped microspheres,*** resonance with plasmonic activity of the surface Au nPs,*** enhanced Raman scattering(SERS)effect,within a single,micro-sized *** luminescent-plasmonic microspheres were used as the active SERS substrate for detection of the organic probe,and for generation of Whispering Gallery Modes(WGM),which red-shift together with increasing laser power(temperature elevation).The products obtained were analysed with optical,scanning and transmission electron microscopy(SEM and TEM),as well as by Raman,absorption and photoluminescence spectroscopies.

关键词： Luminescence Gold nPs-SPR Surface enhanced Raman scattering Microsphere resonators-WGM Lanthanide ions Optical sensors

Improving the radiological diagnosis of hepatic artery thrombosis after liver transplantation: Current approaches and future challenges

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Transplantation 2024年第1期14卷 1-8页

作者： Cristian Lindner Raúl Riquelme Rodrigo San Martín frank Quezada Jorge Valenzuela Juan P Maureira Martín Einersen Department of Radiology Faculty of MedicineUniversity of ConcepciónConcepción 4030000Chile Department of Radiology Hospital Clínico Regional Guillermo Grant BenaventeConcepción 4030000Chile Department of Statistics Catholic University of MauleTalca 3460000Chile neurovascular Unit Department of RadiologyHospital Clínico Regional Guillermo Grant BenaventeConcepción 4030000Chile

Hepatic artery thrombosis(HAT)is a devastating vascular complication following liver transplantation,requiring prompt diagnosis and rapid revascularization treatment to prevent graft *** present,imaging modalities such as ultrasound,computed tomography,and magnetic resonance play crucial roles in diagnosing *** imaging techniques have improved sensitivity and specificity for HAT diagnosis,they have limitations that hinder the timely diagnosis of this *** this sense,the emergence of artificial intelligence(AI)presents a transformative opportunity to address these diagnostic *** development of machine learning algorithms and deep neural networks has demonstrated the potential to enhance the precision diagnosis of liver transplant complications,enabling quicker and more accurate detection of *** article examines the current landscape of imaging diagnostic techniques for HAT and explores the emerging role of AI in addressing future challenges in the diagnosis of HAT after liver transplant.

关键词： Liver transplantation Postoperative complications Hepatic artery Thrombosis Radiology Artificial intelligence

Comprehensive Euler/Lagrange modelling including particle erosion for confined gas-solid flows

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2024年第1期84卷 209-235页

作者： Guiherme A.novelletto Ricardo martin Sommerfeld Multiphase Flow Systems Institute of Process EngineeringOtto-von-Guericke-University MagdeburgHoher Weg 7b06120Halle(Saale)Germany

The present research aims to assess the capability of a comprehensive Euler/Lagrange approach for predicting gas-solid flows and the associated solid particle *** open-source code OpenFOAM®4.1 was used to carry out the numerical simulations,where the standard Lagrangian libraries were substantially extended to account for all necessary *** are tracked considering both translational and rotational motion as well as all relevant forces,such as gravity/buoyancy,drag and transverse lift due to shear and particle *** tracking time step was dynamically adapted ac-cording to the locally relevant time scales,which drastically reduces computational *** approaches are adopted to model particle turbulent dispersion,particle collisions with rough walls and particle-particle *** solid particle erosion models,available in the literature,were considered to estimate pipe bend *** study cases are provided to validate the adopted nu-merical approach and erosion models *** first case intends to evaluate the ability of the extended CFD code to predict the behaviour of gas-solid flows in pneumatic conveying *** goal is achieved by comparing the numerical results with the experimental data obtained by Huber(1997)and Huber and Sommerfeld(1994,1998)in a pneumatic conveying ***,the importance of considering inter-particle collisions and surface roughness for predicting particle velocity,mass flux and mean diameter distributions in gas-solid flows is *** second and third case intend to evaluate the ability of the erosion models in estimating bend erosion in diluted gas-solid *** erosion data obtained experimentally by Mazumder et al.(2008)and Solnordal et al.(2015)in very dilut pneumatic conveying systems is used for validating the numerical results,neglecting now inter-particle collisions and two-way *** a comprehensive analysis of the different influential properti

关键词： Pneumatic conveying Pipe bend numerical calculation(CFD) Euler/Lagrange approach Erosion models Wall roughness

Standards and methods for dent assessment and failure prediction of pipelines:A critical review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2022年第6期19卷 3029-3045页

作者： Jian Zhao Yun-Rong Lv Y.frank Cheng Dept.of Mechanical&Manufacturing Engineering University of CalgaryAlbertaT2N 1N4Canada Guangdong Provincial Engineering Technology Research Center of Petrochemical Corrosion and Safety Guangdong University of Petrochemical TechnologyMaomingGuangdongChina

Dent,a common mechanical damage on pipelines,is associated with a significant local plastic *** can cause pipeline failures,especially when they are combined with other types of defects such as gouges,fatigue,corrosion,and *** this work,a systematic review of various assessment methods and standards for pipeline dents,including the combination of a dent with other defects,is ***,the methods available today are not sufficiently accurate and reliable to assess pipeline dents,especially the dent-defect *** plain dents on pipelines,both the depthbased criterion and the strain-based criterion are commonly used in *** main problems include inaccuracy and *** a dent combined with other defects,the existing assessment techniques are not mature enough to give reliable *** experimental testing and numerical modeling through finite element(FE)analysis are capable of investigating the influence of dents and dent-defect combinations on burst failure pressure of the pipelines,although an approximation to the reality is still the main difficulty existing in the experimental testing and FE ***,relevant studies on assessment techniques for plain dents,a dent with fatigue and a dent with a single gouge have been common in *** combinations of a dent with corrosion or cracks have been rarely assessed due to complicated mechanisms involving a multi-physics coupling *** of novel assessment methods by integrating mechanical stress and strain,electrochemical reactions and steel metallurgy will be a key topic to accurately assess the dent-defect combinations for improved pipeline integrity.

关键词： Dents Pipelines Assessment techniques Burst failure pressure Dent-defect combinations

Physics-constrained graph modeling for building thermal dynamics

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Energy and AI 2024年第2期16卷 150-157页

作者： Ziyao Yang Amol D.Gaidhane Ján Drgoňa Vikas Chandan Mahantesh M.Halappanavar frank Liu Yu Cao School of Electrical Computer and Energy EngineeringArizona State UniversityTempeAZ 85287USA Pacific northwest national Laboratory RichlandWA 99354USA Oak Ridge national Laboratory Oak RidgeTN 37830USA

In this paper,we propose a graph model embedded with compact physical equations for modeling the thermal dynamics of *** principles of heat flow across various components in the building,such as walls and doors,fit the message-passing strategy used by Graph neural networks(Gnns).The proposed method is to represent the multi-zone building as a graph,in which only zones are considered as nodes,and any heat flow between zones is modeled as an edge based on prior knowledge of the building ***,the thermal dynamics of these components are described by compact models in the *** are further employed to train model parameters from collected *** model training,our proposed method enforces physical constraints(e.g.,zone sizes and connections)on model parameters and propagates the penalty in the loss function of *** constraints are essential to ensure model robustness and *** evaluate the effectiveness of the proposed modeling approach on a realistic dataset with multiple *** results demonstrate a satisfactory accuracy in the prediction of multi-zone ***,we illustrate that the new model can reliably learn hidden physical parameters with incomplete data.

关键词： Physics-constrained learning Graph neural networks Compact model Building thermal dynamics

Hybrid 2D–3D optical devices for integrated optics by direct laser writing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2014年第1期3卷 173-181页

作者： martin Schumann Tiemo Buckmann nico Gruhler martin Wegener Wolfram Pernice Institute of Applied Physics and DFG-Center for Functional nanostructures(CFn) Karlsruhe Institute of Technology(KIT)76131 KarlsruheGermany Institute of nanotechnology(InT) 76344 Eggenstein-LeopoldshafenGermany

Integrated optical chips have already been established for application in optical *** also offer interesting future perspectives for integrated quantum optics on a *** present,however,they are mostly fabricated using essentially planar fabrication approaches like electron-beam lithography or UV optical *** further design options would arise if one had complete fabrication freedom in regard to the third dimension normal to the chip without having to give up the virtues and the know-how of existing planar fabrication *** a step in this direction,we here use three-dimensional dip-in direct-laser-writing optical lithography to fabricate three-dimensional polymeric functional devices on pre-fabricated planar optical chips containing Si3n4 waveguides as well as grating couplers made by standard electron-beam *** first example is a polymeric dielectric rectangular-shaped waveguide which is connected to Si3n4 waveguides and that is adiabatically twisted along its axis to achieve geometrical rotation of linear polarization on the *** rotator’s broadband performance at around 1550 nm wavelength is verified by polarization-dependent grating *** polarization rotation on the optical chip cannot easily be achieved by other *** second example is a whispering-gallery-mode optical resonator connected to Si_(3)n_(4) waveguides on the chip via polymeric *** mechanically connecting the latter to the disk,we can control the coupling to the resonator and,at the same time,guarantee mechanical stability of the three-dimensional architecture on the chip.

关键词： direct laser writing integrated optics nanophotonic circuits polarization conversion

The multi--intersection number of a graph

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

西安电子科技大学学报 1990年第4期17卷 22-25页

作者： frank Harary Department of Computer Scicnce New Mexico State University USA

The intersection number, in (G), has been defined as the minimumcardinality of a set S which has n different subsets S_i such that each S_i can beassigned to the node v_i of G and nodes v_i, v_j are adjacent if and onlyif S_i∩S_j ≠0. We introduce the multiset intersection number min (G), defined similarly exceptthat multisets with elements in S may now be assigned to the nodes of G. Weprove that min (G) equals the smallest number ofcliques of G whose union is G.

关键词： Intersection graph number

Periodic surface functional group density on graphene via laserinduced substrate patterning at Si/SiO2 interface

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

nano Research 2020年第9期13卷 2332-2339页

作者： Karolina A.Drogowska-Horna Inam Mirza Alvaro Rodriguez Petr Kovaricek Juraj Sladek Thibault J.-Y.Derrien Mindaugas Gedvilas Gediminas Raciukaitis Otakar frank nadezhda M.Bulgakova martin Kalbac J.Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences Dolejskova 2155/318223 PragueCzech Republic HiLASE Centre Institute of Physics of the Czech Academy of SciencesZa Radnict 82825241 Dolni BrezanyCzech Republic Faculty of nuclear Sciences and Physical Engineering Czech Technical University in PragueBrehova 78/711519Czech Republic Center for Physical Sciences and Technology Savanoriu Ave.231LT-023000VilniusLithuania

Controlling the spatial distribution of functional groups on two-dimensional(2D)materials on a micrometer scale and below represents a fascinating opportunity to achieve anisotropic(opto)electronic properties of these *** patterns of covalent functionalization can lead to pericxJic potentials in the monolayer;however,creating such superstructures is very ***,we describe an original approach to the periodic functionalization of graphene induced by substrate patterning using a pulsed ***-induced periodic surface structures(LIPSS)are produced on silicon wafers with thermally-grown oxide *** irradiation conditions for the formation of UPSS confined at the SiO2/Si interface have been *** imprint their periodicity to the reactivity of the monolayer graphene placed on the substrate via modulation of its local doping *** method is clean,straightforward and scalable with high spatial resolution.

关键词： two-dimensional(2D)materials graphene functionalization laser-induced periodic surface structures(LIPSS) periodic patterns Raman spectroscopy atomic force microscopy(AFM)

Spontaneous liver rupture following SARS-CoV-2 infection in late pregnancy: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 Clinical Cases 2022年第15期10卷 5042-5050页

作者： Radek Ambroz martin Stasek Ján Molnár Petr Spicka Dusan Klos Jozef Hambálek Daniela Skanderová Department of Surgery I University Hospital Olomouc and Faculty of Medicine and DentistryPalacky UniversityOlomouc 77900Czech Republic Department of Obstetrics and Gynecology University Hospital Olomouc and Faculty of Medicine and DentistryPalacky UniversityOlomouc 77900Czech Republic Department of Pathology University Hospital Olomouc and Faculty of Medicine and DentistryPalackýUniversityOlomouc 77900Czech Republic

BACKGROUnD Coronavirus disease-2019(COVID-19)caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)is characterized by systemic inflammatory response syndrome and ***-CoV-2 associated mortality ranges from 2%to 6%.Liver dysfunction was observed in 14%-53%of COVID-19 cases,especially in moderate severe ***,no cases of spontaneous hepatic rupture in pregnant women with SARS-CoV-2 have been *** SUMMARY A 32-year-old pregnant patient(gestational age:32 wk+4 d)without any remarkable medical history or long-term medication presented with ***,non-infectious,and pregnancy-related hepatopathies were *** onset of right subcostal pain with D-dimer and liver enzyme elevation was followed by shock with *** performing an emergency cesarean section,hemoperitoneum was observed,and the patient delivered a stillbirth.A 6-cm liver rupture at the edges of segments V and VI had occurred,which was sutured and ***-CoV-2 positivity on reverse transcriptionpolymerase chain reaction was *** revisions for intrahepatic hematoma with hemorrhagic shock and abdominal compartment syndrome were ***,the patient developed hemoptysis,which was treated using bronchoscopic therapy and non-invasive *** tissue biopsy revealed hemorrhagic foci and necrosis with an irregular centrilobular *** syndrome and autoimmune hepatitis were also ruled *** death was caused by acute intrauterine *** This case reveals that pregnant women with SARS-CoV-2 infection may be predisposed to liver parenchyma disease with liver rupture.

关键词： Liver rupture SARS-CoV-2 Pregnancy Abortion HELLP Case report