检索结果-南通市图书馆

基于mRI的弥漫性胶质瘤分子分型:影像组学和深度学习之间的对比和相关性

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2022年第2期 243-244页

作者： y.m.li D.Wei X.liu X.Fan K.Wang S.W.li 朱能谨

摘要目的弥漫性胶质瘤的分子分型具有重要意义。本研究旨在根据术前多参数mRI建立预测模型。方法回顾性收集北京天坛医院1 016例弥漫性胶质瘤病人的临床资料。

关键词：

Greatly enhanced corrosion/wear resistances of epoxy coating for mg alloy through a synergistic effect between functionalized graphene and insulated blocking layer

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of magnesium and Alloys 2024年第1期12卷 332-344页

作者： Z.y.Xue X.J.li J.H.Chu m.m.li D.N.Zou L.B.Tong School of metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China State Key Laboratory of Advanced Design and manufacturing for Vehicle Body Hunan UniversityChangsha 410082China

The poor corrosion and wear resistances of mg alloys seriously limit their potential applications in various *** conventional epoxy coating easily forms many intrinsic defects during the solidification process,which cannot provide sufficient *** the current study,we design a double-layer epoxy composite coating on mg alloy with enhanced anti-corrosion/wear properties,via the spin-assisted assembly *** outer layer is functionalized graphene(FG)in waterborne epoxy resin(WEP)and the inner layer is Ce-based conversion(Ce)*** FG sheets can be homogeneously dispersed within the epoxy matrix to fill the intrinsic defects and improve the barrier *** Ce film connects the outer layer with the substrate,showing the transition *** corrosion rate of Ce/WEP/FG composite coating is 2131 times lower than that of bare mg alloy,and the wear rate is decreased by~90%.The improved corrosion resistance is attributed to the labyrinth effect(hindering the penetration of corrosive medium)and the obstruction of galvanic coupling *** synergistic effect derived from the FG sheet and blocking layer exhibits great potential in realizing the improvement of multi-functional integration,which will open up a new avenue for the development of novel composite protection coatings of mg alloys.

关键词： mg alloy Functionalized graphene Epoxy coating Corrosion/wear resistance Blocking layer

在线全文

学校读者我要写书评

暂无评论

金属板材成形中拉深损伤模拟的两种求解方法

塑性工程学报 2002年第4期9卷 47-55页

作者：郭英乔 y.m.li K.Saanouni A.Cherouat G.Loppin K.Debray Lab.GmmS UniversityofReimsChampagneArdenne GSm/LASmIS

讨论用数值模拟预测板材成形中发生拉深损伤破坏的两种不同的求解方法。第一种是采用完全耦合的弹塑性破坯模型的动力显式数值方法。基于状态参量的不可逆热力学过程 ,完全耦合的本构方程考虑各向同性强化和拉深。这些已引入有限元软件A... 详细信息

讨论用数值模拟预测板材成形中发生拉深损伤破坏的两种不同的求解方法。第一种是采用完全耦合的弹塑性破坯模型的动力显式数值方法。基于状态参量的不可逆热力学过程 ,完全耦合的本构方程考虑各向同性强化和拉深。这些已引入有限元软件ABAQUS/E用于对金属成形的模拟。在数值技术方面 ,隐式积分方法被用来对本构方程的局部时间积分 ,动力显式技术用于求解总体平衡方程。第二种方案是采用简化的损伤模型的方法 ,被称为逆法 (InveseApprch)。I.A被限定在考虑各向同性强化和损伤的塑性全量理论基础上的简单的本构关系。做比例加载和临界损伤达到以后的损伤饱和假定 ,可以得到损伤演化方程的封闭解。这两种损伤模型在编程中的实施采用两种方式 :计算中考虑或不考虑损伤作用 ,也就是耦合的或非耦合的计算。

关键词：板材成形深拉深损伤模型数值模拟

Fast efficient photon deceleration in plasmas by using two laser pulses at different frequencies

在线全文

学校读者我要写书评

暂无评论

matter and Radiation at Extremes 2024年第3期9卷 11-18页

作者： y.X.Wang X.L.Zhu S.m.Weng P.li X.F.li H.Ai H.R.Pan Z.m.Sheng Key Laboratory for Laser Plasmas(moe) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China Research Center of Laser Fusion of China Academy of Engineering Physics MianyangSichuan 621900China State key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Tsung-dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China

The generation of ultrashort high-power light sources in the mid-infrared(mid-IR)to terahertz(THz)range is of interest for applications in a number of fields,from fundamental research to biology and *** conventional laser technology,photon deceleration in plasma wakes provides an alternative approach to the generation of ultrashort mid-IR or THz ***,we present a photon deceleration scheme for the efficient generation of ultrashort mid-IR or THz pulses by using an intense driver laser pulse with a relatively short wavelength and a signal laser pulse with a relatively long *** signal pulse trails the driver pulse with an appropriate time delay such that it sits at the front of the second wake bubble that is driven by the driver *** to its relatively long wavelength,the signal pulse will be subjected to a large gradient of the refractive index in the plasma wake ***,the photon deceleration in the plasma wake becomes faster and more efficient for signal pulses with longer *** greatly enhances the capacity and efficiency of photon deceleration in the generation of ultrashort high-power light sources in the long-wavelength IR and THz spectral ranges.

关键词： laser ultrashort photon

Tomographic reconstruction of the Earth’s magnetosheath from multiple spacecraft:a theoretical study

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earth and Planetary Physics 2024年第1期8卷 204-214页

作者： A.m.Jorgensen TianRan Sun y.Huang L.li R.Xu L.Dai Chi Wang New mexico Institute of mining and Technology SocorroNMUSA National Space Science Center Chinese Academy of SciencesBeijing 100190China Tsinghua University Beijing 100084China

Following our earlier work on tomographic reconstruction of the magnetosheath soft X-ray emissions with superposed epoch analysis of many images recorded from a single spacecraft we now explore the instantaneous reconstruction of the magnetosheath and magnetopause using a few images recorded simultaneously from a few *** work is motivated by the prospect of possibly having two or three soft X-ray imagers in space in the coming years,and that many phenomena which occur at the magnetopause boundary,such as reconnection events and pressure pulse responses,do not lend themselves as well to superposed epoch *** the reconstruction is successful-which we demonstrate in this paper that it can be-this collection of imagers can be used to reconstruct the magnetosheath and magnetopause from a single image from each spacecraft,allowing for high time resolution *** this paper we explore the reconstruction using,two,three,and four *** show that the location of the subsolar point of the magnetopause can be determined with just two satellites,and that volume emissions of soft X-rays,and the shape of the boundary,can be reconstructed using three or more satellites.

关键词： magnetosheath tomography soft X-ray imaging SmILE

TWO mETHODOLOGIES FOR THE SImULATION OF DUCTILE DAmAGE IN SHEET mETAL FORmING PROCESSES

在线全文

学校读者我要写书评

暂无评论

TWO METHODOLOGIES FOR THE SIMULATION OF DUCTILE DAMAGE IN SH...

THE mULTI-LAyER LASER CLADDING OF Ni60 ALLOy

第八届全国塑性加工学术年会

作者： y.Q.Guo K.Saanouni A.Cherouat y.m.li G.Loppin K.Debray Lab.GmmS University of Reims Champage-ArdenneBP 103951687ReimsFrance GSm/LASmIS University of Technology of TroyesBP 206010010TroyesFrance GSm/LASmIS University of Technology of TroyesBP 206010010TroyesFrance Lab.GmmS Universiy of Reims Champagne-ArdenneBP 103951687ReimsFrance Lab.GmmS Universiy of Reims Champagne-ArdenneBP 103951687ReimsFrance Lab.GmmS Universiy of Reims Champagne-ArdenneBP 103951687ReimsFrance

＜正＞ This paper deals with two different resolution strategies aiming to predict the ductile damage occurrence during the numerical simulation of sheet metal forming *** first one is a dynamic explicit incremental approach with a fully coupled elastoplastic-damage *** on the thermodynamics of irreversible processes with state variables the fully coupled constitutive equations account for both the isotropic hardening and the ductile *** have been implemented into the FE code ABAQUS/Explicit dedicated to the metal forming *** the numerical aspects,an implicit integration scheme is used for local time integration,of the constitutive equations and a dynamic explicit scheme is used to solve global equilibrium *** second strategy is a more simple method called the "Inverse Approach" （LA.） with a simplified damage *** *** limited to a simple constitutive law based on the total deformation theory of plasticity accounting for the isotropic hardening and *** assumptions of proportional loading and damage saturation after the damage threshold lead to a closed form solution for the damage evolution *** numerical implementation of these two damage models is made in such manner that the calculations can be executed with or without damage effect,*** or uncoupled *** examples will show the advantages of each damage model.

关键词：

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

Acta metallurgica Sinica(English Letters) 1999年第5期12卷 1025-1028页

作者： y.m.li,W.D.Huang,L.P.Feng and J.Chen State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

The multi layer coating of Ni60 alloy was got by multi layer laser cladding. The height of the coating was about 12mm and the wall of the coating was perpendicular to the base. The microstructure of the coating was ... 详细信息

关键词： laser near net shaping multi layer laser cladding Ni60 alloy

Physics-informed deep learning for fringe pattern analysis

在线全文

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2024年第1期7卷 4-15页

作者： Wei yin yuxuan Che Xinsheng li mingyu li yan Hu Shijie Feng Edmund y.Lam Qian Chen Chao Zuo Smart Computational Imaging Laboratory(SCILab) School of Electronic and Optical EngineeringNanjing University of Science and TechnologyNanjing 210094China Smart Computational Imaging Research Institute(SCIRI)of Nanjing University of Science and Technology Nanjing 210019China Jiangsu Key Laboratory of Spectral Imaging&Intelligent Sense Nanjing 210094China Department of Electrical and Electronic Engineering The University of Hong KongPokfulamHong Kong SAR 999077China

Recently,deep learning has yielded transformative success across optics and photonics,especially in optical *** neural networks (DNNs) with a fully convolutional architecture (e.g.,U-Net and its derivatives) have been widely implemented in an end-to-end manner to accomplish various optical metrology tasks,such as fringe denoising,phase unwrapping,and fringe ***,the task of training a DNN to accurately identify an image-to-image transform from massive input and output data pairs seems at best naive,as the physical laws governing the image formation or other domain expertise pertaining to the measurement have not yet been fully exploited in current deep learning *** this end,we introduce a physics-informed deep learning method for fringe pattern analysis (PI-FPA) to overcome this limit by integrating a lightweight DNN with a learning-enhanced Fourier transform profilometry (Le FTP) *** parameterizing conventional phase retrieval methods,the Le FTP module embeds the prior knowledge in the network structure and the loss function to directly provide reliable phase results for new types of samples,while circumventing the requirement of collecting a large amount of high-quality data in supervised learning *** by the initial phase from Le FTP,the phase recovery ability of the lightweight DNN is enhanced to further improve the phase accuracy at a low computational cost compared with existing end-to-end *** results demonstrate that PI-FPA enables more accurate and computationally efficient single-shot phase retrieval,exhibiting its excellent generalization to various unseen objects during *** proposed PI-FPA presents that challenging issues in optical metrology can be potentially overcome through the synergy of physics-priors-based traditional tools and data-driven learning approaches,opening new avenues to achieve fast and accurate single-shot 3D imaging.

关键词： optical metrology deep learning physics-informed neural networks fringe analysis phase retrieval

multichannel coupling induced topological insulating phases with full multimerization

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2024年第3期12卷 491-498页

作者： JUN li yAPING yANG C-m.HU mOE Key Laboratory of Advanced micro-Structured materials School of Physics Science and EngineeringTongji UniversityShanghai 200092China Department of Physics and Astronomy University of ManitobaWinnipegManitoba R3T 2N2Canada

We propose and experimentally realize a class of quasi-one-dimensional topological lattices whose unit cells are constructed by coupled multiple identical resonators,with uniform hopping and inversion *** the presence of coupling-path-induced effective zero hopping within the unit cells,the systems are characterized by complete multimerization with degenerate-1 energy edge states for open boundary condition.

关键词： symmetry topological coupling