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Effect of friction on corrosion behaviors of AISI 304 and Cr26Mo1 stainless steels in different solutions

Journal of Iron and Steel Research International 2023年第12期30卷 2541-2556页

作者： Z.x.dai S.L.Jiang L.K.Ning x.d.xu S.Li d.L.duan Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016LiaoningChina School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026AnhuiChina Liaoning Key Laboratory of Aero-engine Materials Tribology Institute of Metal ResearchChinese Academy of SciencesShenyang110016LiaoningChina AnSteel LISCO Stainless Steel Co. Ltd.Guangzhou510760GuangdongChina

The corrosion and tribocorrosion behaviors of AISI 304 austenitic stainless steel and Cr26Mo1 ultrapure high chromium ferrite stainless steel in 3.5 wt.%NaCl and 0.5 mol/L H2SO4 solutions were *** electrochemical measurement technology was applied to identify electrochemistry behaviors during tribocorrosion tests in *** surface morphologies and compositions of the wear tracks were analyzed by scanning electron microscopy and Raman *** results showed that compositions of stainless steels,corrosive mediums and applied loads have great influence on tribocorrosion behaviors of stainless ***,the corrosion resistance in static state of stainless steels primarily dominates its tribocorrosion behavior;meanwhile,better mechanical properties are in favor of tribocorrosion ***,the corrosion rate is promoted significantly in 3.5%NaCl solution by friction,while the tendency is inconspicuous in 0.5 mol/L H2SO4 *** but not least,passive films on stainless steels can be wiped off by small friction *** the increase in applied load,the effect of friction converts to forming friction oxide film from removing passivation film,so that a critical load exists below which the friction force can promote the corrosion process extremely.

关键词： Tribocorrosion Stainless steel/PEEK friction pair Corrosive medium Applied load Microelectrode probe

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On the spray drying of uniform functional microparticles

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Particuology 2015年第5期13卷 1-12页

作者： W.Liu x.d.Chen C.Selomulya department of Chemical Engineering Monash University18 Alliance LaneClayton 3800VICAustralia department of Pharmaceutics School of Pharmaceutical SciencesCentral South University School of Chemical and Environmental Engineering Soochow UniversitySuzhou Industrial Park

Spray drying is a typical method to produce particles in dry powder forms at industrial scale. Most spray-dried products often show a wide range of particle properties even within the same batch. At Monash University, we utilise a microfluidic spray drying approach to generate uniform microparticles with tightly controlled characteristics and sizes in a scalable, almost waste-flee process. The technique is useful to correlate the effects of formulation and spray drying conditions on the properties of spray-dried particles, and can be used to test new formulations for targeted applications such as encapsulation and release of active ingredients. The synthesis route can be applied to other self-assembling systems, includ- ing mesoporous, crystalline, and hierarchically structured microparticles. As spray drying is commonly used in commercial scales, the understanding of how functional particles are formed in relation to formulations and process conditions could assist in developing a cost effective, energy and material-efficient route to produce powders with better properties and ease of handling for more advanced applications such as selective adsorption and bio-separation.

关键词： Microfluidic spray drying Uniform microparticles Encapsulation Controlled release

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Machine learning guided automatic recognition of crystal boundaries in bainitic/martensitic alloy and relationship between boundary types and ductile-to-brittle transition behavior

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Journal of Materials Science & Technology 2021年第25期84卷 49-58页

作者： x.C.Li J.x.Zhao J.H.Cong R.d.K.Misra x.M.Wang x.L.Wang C.J.Shang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China department of Metallurgical Materials and Biomedical EngineeringUniversity of Texas at El Paso500 W.University AvenueEl PasoTX 79968USA

Gradient boosting decision tree(GBdT)machine learning(ML)method was adopted for the first time to automatically recognize and conduct quantitative statistical analysis of boundaries in bainitic microstructure using electron back-scatter diffraction(EBSd)*** spite of lack of large sets of EBSd data,we were successful in achieving the desired accuracy and accomplishing the objective of recognizing the *** with a low model accuracy ofxis-angle pair as characteristic features,the accuracy of the model was significantly enhanced to about 88%when the Euler angle was converted to overall misorientation angle(OMA)and specific misorientation angle(SMA)and considered as important *** this model,the recall score of prior austenite grain(PAG)boundary was~93%,high angle packet boundary(OMA>40°)was~97%,and block boundary was~96%.The derived outcomes of ML were used to obtain insights into the ductile-to-brittle transition(dBTT)***,ML modeling approach suggested that dBTT was not determined by the density of high angle grain boundaries,but significantly influenced by the density of PAG and packet *** study underscores that ML has a great potential in detailed recognition of complex multi-hierarchical microstructure such as bainite and martensite and relates to material performance.

关键词： Machine learning Feature engineering Automatic recognition Lath structure Crystallography

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A 3d SiC MOSFET with poly-silicon/SiC heterojunction diode

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Chinese Physics B 2022年第1期31卷 669-674页

作者： sheng-Long Ran Zhi-Yong Huang sheng-dong Hu Han Yang Jie Jiang du Zhou Chongqing Engineering Laboratory of High Performance Integrated Circuits School of Microelectronics and Communication EngineeringChongqing UniversityChongqing 400044China

A three-dimensional(3d)silicon-carbide(SiC)trench metal-oxide-semiconductor field-effect transistor(MOSFET)with a heterojunction diode(HJd-TMOS)is proposed and studied in this *** SiC MOSFET is characterized by an HJd which is partially embedded on one side of the *** the device is in the turn-on state,the body parasitic diode can be effectively controlled by the embedded HJd,the switching loss thus decreases for the ***,a highly-doped P+layer is encircled the gate oxide on the same side as the HJd and under the gate oxide,which is used to lighten the electric field concentration and improve the reliability of gate oxide *** mechanism for the HJd-TMOS is *** with the conventional device with the same level of on-resistance,the breakdown voltage of the HJd-TMOS is improved by 23.4%,and the miller charge and the switching loss decrease by 43.2%and 48.6%,respectively.

关键词： heterojunction diode SiC MOSFET switching loss on-state resistance

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design of a Prototype EHd Air Pump for Electronic Chip Cooling Applications

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Plasma Science and Technology 2014年第5期16卷 491-501页

作者： Emmanouil d.FYLLAdITAKIS Antonios x.MORONIS Konstantinos KIOUSIS Technological Educational Institute(TEI) of Athens Department of Energy Technology

This paper presents the design,optimization and fabrication of an EHd air pump intended for high-power electronic chip cooling *** high-voltage electrode configurations were selected and studied,in terms of the characteristics of the generated electric field,which play an important role in ionic wind *** this purpose,dedicated software is used to implement finite element *** design parameters,such as the electric field intensity,wind velocity,current flow and power consumption are *** different laboratory prototypes are fabricated and their performances experimentally *** procedure leads to the fabrication of a final prototype,which is then tested as a replacement of a typical fan for cooling a high power density electronic *** assist towards that end,an experimental thermal testing setup is designed and constructed to simulate the size of a personal computer’s CPU core of variable *** parametric study leads to the fabrication of experimental single-stage EHd pumps,the optimal design of which is capable of delivering an air flow of 51 CFM with an operating voltage of 10.5 ***,the theoretical and experimental results are evaluated and potential applications are proposed.

关键词： electrohydrodynamics(EHd) ionic wind EHd pump cooling apparatus finite element method computer CPU cooling electronic chip cooling

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Prediction of the Mooring Force of a 2-d Floating Oil Storage Tank

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Journal of Ocean University of China 2014年第6期13卷 901-910页

作者： CHU xinjie dONG sheng ZHAO xizeng College of Engineering Ocean University of China drilling Technology Research Institute of shengli Petroleum Engineering Corporation Limited SINOPEC Ocean College Zhejiang University

A Constrained Interpolation Profile （CIP）-based model is developed to predict the mooring force of a two-dimensional floating oil storage tank under wave conditions, which is validated against to a newly performed experiment. In the experiment, a box-shaped floating oil storage apparatus is used. Computations are performed by an improved CIP-based Cartesian grid model, in which the THINC/SW scheme （THINC： tangent of hyperbola for interface capturing; SW： Slope Weighting）, is used for interface capturing. A multiphase flow solver is adopted to treat the water-air-body interactions. The Immersed Boundary Method （IBM） is implemented to treat the body surface. Main attention is paid to the sum force of mooring line and velocity field around the body. It is found that the sum force of the mooring line increases with increasing wave amplitude. The body suffers from water wave impact and large body motions occur near the free surface. The vortex occurs near the sharp edge, i.e., the sharp bottom comers of the float- ing oil storage tank and the vortex shedding can be captured by the present numerical model. The present model could be further improved by including turbulence model which is currently under development. Comparison between the computational mooring forces and the measured mooring forces is presented with a reasonable agreement. The developed numerical model can predict the mooring line forces very well.

关键词： floating oil storage mooring line force CIP method numerical method Immersed Boundary Method

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4d spinless topological insulator in a periodic electric circuit

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National Science Review 2020年第8期7卷 1288-1295页

作者： Rui Yu Y.x.Zhao Andreas P.Schnyder School of Physics and Technology Wuhan University National Laboratory of Solid State Microstructures and department of Physics Nanjing University Collaborative Innovation Center of Advanced Microstructures Nanjing University Max-Planck-Institute for Solid State Research

According to the mathematical classification of topological band structures, there exist a number of fascinating topological states in dimensions larger than three with exotic boundary phenomena and interesting topological responses. While these topological states are not accessible in condensed matter systems, recent works have shown that synthetic systems, such as photonic crystals or electric circuits, can realize higher-dimensional band structures. Here, we argue that, because of its symmetry properties, the 4d spinless topological insulator is particularly well suited for implementation in these synthetic systems. We explicitly construct a 2d electric circuit lattice, whose resonance frequency spectrum simulates the 4d spinless topological insulator. We perform detailed numerical calculations of the circuit lattice and show that the resonance frequency spectrum exhibits pairs of 3d Weyl boundary states, a hallmark of the nontrivial topology. These pairs of 3d Weyl states with the same chirality are protected by classical time-reversal symmetry that squares to +1, which is inherent in the proposed circuit lattice. We also discuss how the simulated 4d topological band structure can be observed in experiments.

关键词： topological circuit 4d topological states 4d topological Hall effect second Chern number Weyl states

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Preoperative 3d reconstruction and fluorescent indocyanine green for laparoscopic duodenum preserving pancreatic head resection:A case report

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World Journal of Clinical Cases 2023年第4期11卷 903-908页

作者： xiao-Li Li Lian-sheng Gong department of General Surgery Xiangya HospitalCentral South UniversityChangsha 410008Hunan ProvinceChina

BACKGROUNd duodenum-preserving pancreatic head resection(dPPHR)is the choice of surgery for benign or low-grade malignant tumors of the pancreatic *** dPPHR(LdPPHR)procedure can be improved by preoperative 3d model reconstruction and the use of intravenous indocyanine green fluorescent before surgery for real-time navigation with fluorescent display to guide the surgical dissection and prevention of from injury to vessels and biliary *** SUMMARY Here we report the successful short-and long-term outcomes after one year following LdPPHR for a 60-year lady who had an uneventful recovery and was discharged home one week after the *** There was no bile leakage or pancreatic leakage or delayed gastric *** histopathology report showed multiple cysts in the pancreatic head and localized pancreatic intraepithelial tumor *** resected margin was free of tumor.

关键词： duodenum-preserving pancreatic head resection Fluorescent navigation Laparoscopic 3d model reconstruction Case report

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HRPose: Real-Time High-Resolution 6d Pose Estimation Network Using Knowledge distillation

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Chinese Journal of Electronics 2023年第1期32卷 189-198页

作者： GUAN Qi sheng Zihao xUE Shibei department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai Engineering Research Center of Intelligent Control and Management

Real-time six degrees-of-freedom(6d)object pose estimation is essential for many real-world applications, such as robotic grasping and augmented reality. To achieve an accurate object pose estimation from RGB images in real-time, we propose an effective and lightweight model, namely high-resolution 6d pose estimation network(HRPose). We adopt the efficient and small HRNetV2-W18 as a feature extractor to reduce computational burdens while generating accurate 6d poses. With only 33% of the model size and lower computational costs, our HRPose achieves comparable performance compared with state-of-the-art models. Moreover, by transferring knowledge from a large model to our proposed HRPose through output and feature-similarity distillations, the performance of our HRPose is improved in effectiveness and efficiency. Numerical experiments on the widely-used benchmark LINEMOd demonstrate the superiority of our proposed HRPose against state-of-the-art methods.

关键词： Knowledge engineering Computational modeling Pose estimation Grasping Benchmark testing Feature extraction Real-time systems

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Short-range ordering plays a determining role in the low-cycle fatigue life improvement of fcc metals: A conclusive study on low solid-solution hardening Ni-Cr alloys

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Journal of Materials Science & Technology 2023年第25期156卷 157-171页

作者： Y.J.Zhang d.Han x.W.Li department of Materials Physics and Chemistry School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The effect of short-range ordering (SRO) on the low-cycle fatigue (LCF) behavior of low solid-solution hardening Ni-Cr alloys with high stacking fault energies (SFEs) was systematically studied under cycling at constant total strain amplitude (Δε t /2) in the range of 0.1%–0.7%. The results show that an inducement of SRO structures can notably improve the fatigue life of the alloy regardless of Δε t /2, and several unique fatigue characteristics have been detected, including the transition of fatigue cracking mode from intergranular cracking to slip band cracking, the non-negligible evolution from non-Masing behavior in pure Ni to Masing behavior in the Ni-40Cr alloy, and the secondary cyclic hardening behavior in the Ni-10Cr and Ni-20Cr alloys. All these experimental phenomena are tightly associated with the transformation in cyclic deformation mechanisms that is induced by SRO based on the “glide plane softening” effect. Furthermore, a comprehensive fatigue life prediction model based on total hysteresis energy has been reasonably proposed, focusing on the analyses of the macroscopic model parameters (namely the fatigue cracking resistance exponent β and the crack propagation resistance parameter W 0 ) and microscopic damage mechanisms. In brief, on the premise that the effects of SFE and friction stress can be nearly ignored, as in the case of the present low solid-solution hardening Ni-Cr alloys with high SFEs, an enhancement of SRO in face-centered cubic metals has been convincingly confirmed to be an effective strategy to improve their LCF performance.

关键词： Ni-Cr alloy Short range ordering Low solid-solution hardening Low-cycle fatigue Slip mode Fatigue life prediction model

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