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Advances in Photoacoustic Imaging for Interventional Application

Transactions of Nanjing University of Aeronautics and Astronautics 2018年第6期35卷 924-941页

作者： zhang Jianhui Yan kang wang Boquan zhang Buchun Gong Xiaojing School of Mechanical and Electric Engineering Guangzhou University State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Research Lab for Biomedical Optics and Molecular Imaging Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Department of Cardiology The Affiliated Hospital of Xuzhou Medical University

The incidence and mortality of cardiovascular diseases and gastrointestinal cancer have gradually increased in recent years,and these diseases have become major social and public-health *** requirements have been proposed for the clinical diagnosis of these diseases in the hope that,by accessing accurate structural information,to further grasp the functional information which closely related to the development of the *** imaging is a new imaging method in which ultrasonic signals are generated from biological samples by laser-pulse *** has the advantages of high optical contrast,large ultrasound penetration depth,and high ***,it can acquire spectral *** integration of a photoacoustic imaging system into a tiny imaging catheter can realize interventional imaging based on photoacoustic *** combination of structural imaging of cardiovascular and gastrointestinal lesion regions with photoacoustic spectroscopy to identify and quantify tissue components can realize highly sensitive functional *** surveying the recent progress in the development of the photoacoustic imaging method for interventional application,with a particular emphasis on intravascular photoacoustic imaging,photoacoustic endoscopy,and photoacoustic spectroscopy,we summarize and identify future research directions for interventional photoacoustic imaging.

关键词： photoacoustic imaging interventional intravascular photoacoustic imaging photoacoustic endoscopy photoacoustic spectroscopy

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IDENTIFICATION OF ELASTIC-PLASTIC MECHANICAL PROPERTIES FOR BIMETALLIC SHEETS BY HYBRID-INVERSE APPROACH

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Acta Mechanica Solida Sinica 2010年第1期23卷 29-35页

作者： Honglei zhang Xuehui Lin Yanqun wang Qian zhang Yilan kang School of Mechanical Engineering Tianjin University Tianjin 300072 China School of Mechanical Engineering Fuzhou University Fuzhou 350108 China

Analysis, evaluation and interpretation of measured signals become important components in engineering research and practice, especially for material characteristic parameters which can not be obtained directly by experimental measurements. The present paper proposes a hybrid-inverse analysis method for the identification of the nonlinear material parameters of any individual component from the mechanical responses of a global composite. The method couples experimental approach, numerical simulation with inverse search method. The experimental approach is used to provide basic data. Then parameter identification and numerical simulation are utilized to identify elasto-plastic material properties by the experimental data obtained and inverse searching algorithm. A numerical example of a stainless steel clad copper sheet is consid- ered to verify and show the applicability of the proposed hybrid-inverse method. In this example, a set of material parameters in an elasto-plastic constitutive model have been identified by using the obtained experimental data.

关键词： identification of parameters hybrid-inverse approach elasto-plastic mechanical properties of bimetallic sheets

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凝析气藏CO_(2)构造埋存量评估方法研究

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陕西科技大学学报 2025年第1期43卷 101-106页

作者：张铃丰廖新维唐康王晓晨邹建栋中国石油大学(北京)石油工程教育部重点实验室北京102249 中国石油长庆油田分公司陕西西安710018 中国石油塔里木分公司新疆库尔勒841004

凝析气藏中复杂的气液相态变化为CO_(2)埋存潜力评估带来很大困难.为了进一步提高凝析气藏CO_(2)构造埋存量的计算准确性,基于物质的量守恒原理,考虑注入CO_(2)与凝析气体混合、反凝析变化、岩石和束缚水形变等因素,推导了凝析气藏生产... 详细信息

凝析气藏中复杂的气液相态变化为CO_(2)埋存潜力评估带来很大困难.为了进一步提高凝析气藏CO_(2)构造埋存量的计算准确性,基于物质的量守恒原理,考虑注入CO_(2)与凝析气体混合、反凝析变化、岩石和束缚水形变等因素,推导了凝析气藏生产阶段及CO_(2)埋存阶段物质平衡通式,进一步建立了凝析气藏CO_(2)构造埋存量评估方法.结果表明,该方法计算的CO_(2)构造埋存量与数值模拟结果吻合度较好,误差在6.42%以内.忽略混合气体偏差因子变化会导致CO_(2)构造埋存量计算结果偏大,误差达到18.61%.忽略反凝析变化则会导致CO_(2)构造埋存量计算结果偏小,这一误差在低埋存压力区间内高达9.93%.该方法对凝析气藏中CO_(2)构造埋存量评估及CO_(2)埋存方案优化具有重要意义.

关键词：凝析气藏 CO_(2)构造埋存量物质平衡埋存潜力评估

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Less is more: a new machine-learning methodology for spatiotemporal systems

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Communications in Theoretical Physics 2022年第5期74卷 114-120页

作者： Sihan Feng kang wang Fuming wang Yong zhang Hong Zhao Department of Physics Xiamen UniversityXiamen 361005 China Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu ProvinceLanzhou UniversityLanzhou 730000China

Machine learning provides a way to use only portions of the variables of a spatiotemporal system to predict its subsequent evolution and consequently avoids the curse of *** learning machines employed for this purpose,in essence,are time-delayed recurrent neural networks with multiple input neurons and multiple output *** show in this paper that such kinds of learning machines have a poor generalization ability to variables that have not been trained *** then present a one-dimensional time-delayed recurrent neural network for the same aim of model-free *** can be trained on different spatial variables in the training stage but initiated by the time series of only one spatial variable,and consequently possess an excellent generalization ability to new variables that have not been trained *** network presents a new methodology to achieve finegrained predictions from a learning machine trained on coarse-grained data,and thus provides a new strategy for certain applications such as weather *** verifications are performed on the Kuramoto coupled oscillators and the Barrio-Varea-Aragon-Maini model.

关键词： machine learning spatiotemporal systems prediction dynamical systems time series time-delayed recurrent neural network

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Oxygen and sulfur-based pure n-electron dendrimeric systems:generation-dependent clusteroluminescence towards multicolor cell imaging and molecular ruler

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Science China Chemistry 2021年第11期64卷 1990-1998页

作者： Zhijun zhang Haoke zhang Miaomiao kang Na Li Dong wang Ben Zhong Tang Center for AIE Research Shenzhen Key Laboratory of Polymer Science and TechnologyGuangdong Research Center for Interfacial Engineering of Functional MaterialsCollege of Material Science and EngineeringShenzhen UniversityShenzhen518060China Key Laboratory of Macromolecular Synthesis and Functionalization(Ministry of Education) Department of Polymer Science and EngineeringZhejiang UniversityHangzhou310027China Shenzhen Institute of Molecular Aggregate Science and Engineering School of Science and EngineeringThe Chinese University of Hong KongShenzhen518172China

Dendrimers,as the latest generation of artificial macromolecules,have aroused great attention in the field of clusteroluminescence owing to their unique structural and photophysical ***,previously reported dendrimers with clusteroluminescenence property usually containπelectrons-involved carbonyl groups and/or environment-sensitive aliphatic amine moieties in their structures,thus complicating the interpretation of the emission *** the other hand,a systematic investigation on the luminescence performance of dendrimers with diverse generations is significantly important for the researchers to gain further mechanistic insights into the clusteroluminescence,but has still been scarcely *** this contribution,we reported a series of oxygen and sulfur-based pure n-electron dendrimers with different generations from G1 to *** from the highly-branched three-dimensional crowded molecular structures,all these dendrimers exhibited bright fluorescence emission in visible light region due to their prominent clusteroluminescence ***,the fluorescence intensity and emission wavelength were simultaneously boosted as their generation increased due to the more crowded molecular architectures,as well as the formation of tighter and larger clusters at higher ***,these dendrimers also showed concentration-and aggregation-enhanced luminescence behaviors,presenting typical aggregation-induced emission(AIE)*** with remarkable water solubility and biocompatibility as well as the excellent photostability,the G3 dendrimer selected as a representative was successfully applied in the multicolor cell *** addition,the G3 dendrimer was also proved to be capable of acting as a molecular ruler to detect specific-sized molecule in aqueous *** work not only validated the rationality of the clusteroluminescence mechanism but also offered high-performance clusteroluminogens for practical application.

关键词： clusteroluminescence aggregation-induced emission dendrimer cell imaging molecular ruler

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Characterization of Automotive Brake Discs with Laser-Machined Surfaces

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Automotive Innovation 2019年第3期2卷 190-200页

作者： Shuwen wang wang Guo kang Zeng Xuegang zhang College of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China

In the automotive and transport industry,braking noise and vibrations are persisting issues and difficult to ***-tive engineers and researchers are putting considerable effort into overcoming these problems,and significant breakthroughs have been made in this *** this study,M-shaped grooves were bionically designed and manufactured on the frictional surfaces of four automotive brake discs using a laser *** tests were conducted to characterize the physical and mechanical performance of the modified discs along with their noise and vibration *** experimental results demonstrate that discs with laser-machined grooved surfaces have better surface hardness and residual stress reduction than discs with un-grooved *** improvement in the braking performance was observed in terms of disc thickness variation,friction and wear,noise,and vibration *** is concluded that the reduction in braking noise and vibrations is mainly caused by the reduction in the coefficient of friction and wear,increase in damping ratio,and improvement of disc thickness variation of the brake disc by laser surface grooving.

关键词： Brake disc Bionic design Laser machining Disc thickness variation Residual stress Friction and wear Vibration and noise

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Feature selection for probabilistic load forecasting via sparse penalized quantile regression

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Journal of Modern Power Systems and Clean Energy 2019年第5期7卷 1200-1209页

作者： Yi wang Dahua GAN Ning zhang Le XIE Chongqing kang Department of Electrical Engineering Tsinghua UniversityBeijingChina Department of Electrical and Computer Engineering Texas A&M UniversityUvaldeTXUSA

Probabilistic load forecasting(PLF)is able to present the uncertainty information of the future *** is the basis of stochastic power system planning and *** works on PLF mainly focus on how to develop and combine forecasting models,while the feature selection issue has not been thoroughly investigated for *** paper fills the gap by proposing a feature selection method for PLF via sparse L1-norm penalized quantile *** can be viewed as an extension from point forecasting-based feature selection to probabilistic forecasting-based feature *** both the number of training samples and the number of features to be selected are very large,the feature selection process is casted as a large-scale convex optimization *** alternating direction method of multipliers is applied to solve the problem in an efficient *** conduct case studies on the open datasets of ten *** results show that the proposed feature selection method can improve the performance of the probabilistic forecasting and outperforms traditional least absolute shrinkage and selection operator method.

关键词： Probabilistic load forecasting Feature selection Alternating direction method of multipliers(ADMM) Quantile regression L1-norm penalty

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Topology characteristics of three-dimensional grains in polycrystalline materials

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Science China(Technological Sciences) 2019年第2期62卷 263-268页

作者： wang Hao XUE WeiHua kang RenMu zhang YiFan LIU GuoQuan School of Materials Science and Engineering University of Science and Technology Beijing School of Materials Science and Engineering Liaoning Technical University Deyang Products Quality Supervision and Inspection Institute Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing

The quantitative microstructural analysis in recrystallized pure iron is carried out by serial sectioning experiment coupled with three-dimensional(3-D) grain reconstruction technique. The full 3-D morphology of 16254 pure iron grains, which is the largest experimental 3-D grain dataset to date, is obtained. It is shown that the peak and the mean of the grain face number distribution were 10 and 13.5, respectively. For individual grains, the average trends that the highest and lowest face classes exhibited the highest affinity for mutual contact but the lowest affinity for contact with themselves are experimentally confirmed by 3-D pure iron grains. The pure iron grains are observed to have much more three-edged faces than Monte Carlo grains, resulting in relatively higher average dispersions of the grain edge distribution.

关键词： 3-D characterization serial sectioning Monte Carlo grain growth topology

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Precipitation behaviors and mechanical properties of a solution-treated Mg-Gd-Nd-Zn-Zr alloy during equal-channel angular pressing process

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Journal of Magnesium and Alloys 2022年第1期10卷 257-266页

作者： Zhenzhen Gui Fen wang Junyi zhang Dexin Chen Zhixin kang School of Mechanical and Electrical Engineering Guangzhou University230 Wai Huan Xi RoadGuangzhou Higher Education Mega CenterGuangzhou 510006China Guangdong Key Laboratory for Advanced Metallic Materials Processing School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou 510640China Institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan University601 Hmmgpu Avenue WestGuangzhou 510632China

A magnesium alloy processed by equal-channel angular pressing (ECAP) exhibited excellent microstructure refinement and improved strength and *** comprehensive mechanical properties of magnesium alloys have supported the expansion of their applications in the automotive,aerospace,and biomedical ***,pre-treatment of a solution-treated Mg-2.9Gd-1.5Nd-0.3Zn-0.3Zr alloy was conducted to investigate the precipitate behavior and microstructure evolution during the ECAP process.β;phase grains quickly precipitated from the solution-treated alloy,which accelerated grain refinement and enhanced the ductility after the ECAP process,as compared to the as-cast alloy reported in our previous ***,spherical precipitates (~200 nm) and fine phases (~100 nm) precipitated along the stripe-like Zn;Zr;phase,which formed a kabap-like structure dispersing homogeneously in the solution-treated alloy during the ECAP *** to grain refinement,dislocations,sphericalβ;precipitates,and texture evolution,the solution-treated alloy after eight passes of ECAP exhibited good comprehensive mechanical properties,with the ultimate tensile strength,yield strength,and elongation values reaching210.9 MPa,263.9 MPa,and 27.9%,respectively.

关键词： Mg-Gd-Nd-Zn-Zr alloy Precipitations Solid solution ECAP Mechanical properties

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Analysis of Thermoelastohydrodynamic Performance of Journal Misaligned Engine Main Bearings

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Chinese Journal of Mechanical Engineering 2015年第3期28卷 511-520页

作者： BI Fengrong SHAO kang LIU Changwen wang Xia zhang Jian State Key Laboratory of Engines Tianjin University

To understand the engine main bearings＇ working condition is important in order to improve the performance of engine. However, thermal effects and thermal effect deformations of engine main bearings are rarely considered simultaneously in most studies. A typical finite element model is selected and the effect of thermoelastohydrodynamic（TEHD） reaction on engine main bearings is investigated. The calculated method of main bearing＇s thermal hydrodynamic reaction and journal misalignment effect is finite difference method, and its deformation reaction is calculated by using finite element method. The oil film pressure is solved numerically with Reynolds boundary conditions when various bearing characteristics are calculated. The whole model considers a temperature-pressure-viscosity relationship for the lubricant, surface roughness effect, and also an angular misalignment between the journal and the bearing. Numerical simulations of operation of a typical I6 diesel engine main bearing is conducted and importance of several contributing factors in mixed lubrication is discussed. The performance characteristics of journal misaligned main bearings under elastohydrodynamic（EHD） and TEHD loads of an I6 diesel engine are received, and then the journal center orbit movement, minimum oil film thickness and maximum oil film pressure of main bearings are estimated over a wide range of engine operation. The model is verified through the comparison with other present models. The TEHD performance of engine main bearings with various effects under the influences of journal misalignment is revealed, this is helpful to understand EHD and TEHD effect of misaligned engine main bearings.

关键词： main bearings journal misaligned oil film pressure Reynolds equation finite difference methods thermoelastohydrodynamic(TEHD)

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