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Hot roll bonding between commercially pure titanium and high-strength low-alloy steel using Fe interlayer

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Journal of Iron and Steel Research International 2019年第10期26卷 1126-1136页

作者： Xi-yang chai Gang Chen Feng chai Tao Pan Zhi-gang yang Cai-fu yang Department of Structural Steel Central Iron and Steel Research InstituteBeijing 100081China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

Hot roll bonding was carried out between commercially pure titanium TA2 and high-strength low-alloy steel Q390 using no interlayer and Fe interlayer at temperatures of 850,900,950 and 1000℃with a total reduction ratio of 86.7%.Interfacial microstructure and bonding property of clad plates were investigated by electron microscopy and shear *** results showed that with the increase in heating temperature,the shear strength of titanium clad steel plates decreases *** with that of titanium clad steel plates with no interlayer,inserting Fe interlayer between titanium and steel can improve the shear strength at 850 and 900℃but deteriorate the shear strength at 950 and 1000℃.The reason for this consequence was that Fe interlayer prevented the reaction diffusion of C in titanium to form a thinner TiC layer at 850 and 900℃,while Fe interlayer promoted the reaction diffusion of Fe in titanium to generate thicker Fe2Ti and FeTi intermetallic compound layers at 950 and 1000℃.

关键词： Titanium clad steel plate Fe interlayer TiC Intermetallic compound Hot roll bonding

Interlayer engineering for titanium clad steel by hot roll bonding

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Journal of Iron and Steel Research International 2018年第7期25卷 739-745页

作者： Xi-yang chai Tao Pan Feng chai Xiao-bing Luo Hang Su Zhi-gang yang Cai-fu yang Department of Structural Steels Central Iron and Steel Research Institute Beijing 100081 China School of Materials Science and Engineering Tsinghua University Beijing 100084 China

Hot roll bonding was carried out between commercially pure titanium TA2 and high-strength low-alloy steel Q390 using pure Nb or Mo interlayer at 950 ~C with a total reduction ratio of 86.7%. Interfacial microstructure and bonding properties of titanium clad steel plates were investigated by electron microscopy and mechanical tests. The results showed β-Ti, TiC and Fe2Ti reaction phases were generated at Ti/steel interface for the clad plates with no interlayer. Inserting Nb or Mo interlayer can effectively suppress the formation of brittle phases, while the weak bonding joint transferred to Nb/steel or Mo/steel interface. And some micro-voids were found at the interface of Nb/steel and Mo/steel. The improved shear strength of clad plates with Nb interlayer might be attributed to the elimination of brittle phases at bonding interface. The small size and little quantities of the micro-voids at Nb/steel interface had a relatively weak effect on shear strength. However, the large number and big size of micro-voids were responsible for the degradation of shear strength for the clad plates with Mo interlayer.

关键词： Titanium clad steel Interlayer - Interfacial microstructure Brittle phase Micro-void

HYBRID CONTROL OF HYDRAULIC PRESS MACHINE BASED ON ROBUST CONTROL

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Chinese Journal of Mechanical Engineering 2008年第2期21卷 72-76页

作者： FANG Yu yang Jian chai Xiaodong School of Urban Railway Transportation Shanghai University of Engineering Science Shanghai 201620 China

A robust control algorithm is proposed to focus on the non-linearity and variables of the hydraulic press machine with the proportional vatve. The proposed robust controller does not need to design stable compensator in advance, which is simple in design and has large scope of uncertainty applications. The feedback gains of the proposed robust controller are small, so it is easily implemented in engineering applications. The theoretical and experimental research on the position and speed control of the hydraulic press machine is carried out. The control requirements of the hydraulic press machine during the working process are met in the position and speed at the same time. Experimental results show that the proposed controller has better robustness subject to load variables and adaptability of parameter variations of the hydraulic press machine with the proportional valve.

关键词： Robust control Hydraulic press machine Position and speed control

Defect engineering of two-dimensional materials towards nextgeneration electronics and optoelectronics

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Nano Research 2023年第2期16卷 3104-3124页

作者： Jie Jiang Peng yang Juin JLiou Wugang Liao yang chai College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongChina

The ultrathin body of two-dimensional(2D)materials provides potential for next-generation electronics and *** unavoidable atomic defects substantially determine the physical properties of atomic-level thin 2D materials,thus enabling new functionalities that are impossible in three-dimensional ***,rational design of atomic defects provides an alternative approach to modulate the physical properties of 2D *** this review,we summarize the recent progress of defect engineering in 2D materials,particularly in device performance ***,the common defects in 2D materials and approaches for generating and repairing defects,including synthesis and post-growth treatments,are systematically *** correlations between defects and optical,electronic,and magnetic properties of 2D materials are then ***,defect engineering for high performance electronics and optoelectronics is *** last,we provide our perspective on challenges and opportunities in defect engineering of 2D materials.

关键词： two-dimensional materials defect engineering electronics optoelectronics

Recent Progress on Data-Based Optimization for MineralProcessing Plants

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Engineering 2017年第2期3卷 183-187页

作者： Jinliang Ding Cuie yang Tianyou chai State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang 110819 China

In the globalized market environment, increasingly significant economic and environmental factors withincomplex industrial plants impose importance on the optimization of global production indices; such opti-mization includes improvements in production efficiency, product quality, and yield, along with reductionsof energy and resource usage. This paper briefly overviews recent progress in data-driven hybrid intelli-gence optimization methods and technologies in improving the performance of global production indicesin mineral processing. First, we provide the problem description. Next, we summarize recent progress indata-based optimization for mineral processing plants. This optimization consists of four layers： optimiza-tion of the target values for monthly global production indices, optimization of the target values for dailyglobal production indices, optimization of the target values for operational indices, and automation systemsfor unit processes. We briefly overview recent progress in each of the different layers. Finally, we point outopportunities for future works in data-based optimization for mineral processing plants.

关键词： Data-based optimization Plant-wide global optimization Mineral processing Survey

Few-layer Tellurium:one-dimensional-like layered elementary semiconductor with striking physical properties

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Science Bulletin 2018年第3期63卷 159-168页

作者： Jingsi Qiao Yuhao Pan Feng yang Cong Wang yang chai Wei Ji Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices Department of Physics Renmin University of China Department of Applied Physics The Hong Kong Polytechnic University

Few-layer Tellurium, an elementary semiconductor, succeeds most of striking physical properties that black phosphorus(BP) offers and could be feasibly synthesized by simple solution-based methods. It is comprised of non-covalently bound parallel Te chains, among which covalent-like feature *** feature is, we believe, another demonstration of the previously found covalent-like quasi-bonding(CLQB) where wavefunction hybridization does occur. The strength of this inter-chain CLQB is comparable with that of intra-chain covalent bonding, leading to closed stability of several Te allotropes. It also introduces a tunable bandgap varying from nearly direct 0.31 eV(bulk) to indirect 1.17 eV(2L) and four(two) complex, highly anisotropic and layer-dependent hole(electron) pockets in the first Brillouin *** also exhibits an extraordinarily high hole mobility(~10~5 cm^2/Vs) and strong optical absorption along the non-covalently bound direction, nearly isotropic and layer-dependent optical properties, large ideal strength over 20%, better environmental stability than BP and unusual crossover of force constants for interlayer shear and breathing modes. All these results manifest that the few-layer Te is an extraordinary-high-mobility, high optical absorption, intrinsic-anisotropy, low-cost-fabrication, tunable bandgap, better environmental stability and nearly direct bandgap semiconductor. This ‘‘one-dimen sion-like" few-layer Te, together with other geometrically similar layered materials, may promote the emergence of a new family of layered materials.

关键词： Two-dimensional systems First-principles calculations Tellurium High carrier mobility Covalent-like quasi-bonding One-dimension-like layered materials

Neuromorphic sensory computing

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Science China(Information Sciences) 2022年第4期65卷 114-127页

作者： Tianqing WAN Sijie MA Fuyou LIAO Lingwei FAN yang chai Department of Applied Physics The Hong Kong Polytechnic University The Hong Kong Polytechnic University Shenzhen Research Institute

The number of sensory nodes in the Internet of everything continues to increase rapidly and generate massive data. The generated information from sensory nodes is much larger than the total collective human sensory throughput. It is quite challenging to send all of the data produced at sensory terminals to the“Cloud” computation center, especially for those time-delay sensitive applications. This situation demands a dramatic increase in the computation near or inside sensory networks. Inspired by biological sensory systems with a high data compression ratio, neuromorphic sensory computing provides a way to efficiently acquire and process a large volume of data from complex environments. Researchers have been investigating emerging materials, devices, circuits, and computing architectures to implement an artificial sensory system with high energy efficiency, speed, and density. Here we summarize the important features of biological systems and their hardware implementations. Electrons and photons are two representative information carriers, in which electron carrier allows high integration density for complex computing and photon carrier has high connectivity, high speed, wide bandwidth, and low power consumption. We overview the electronic and optical neuromorphic sensory computing and hybrid opto-electronic sensory computing, and present advances on multimodal sensory computing and their potential challenges.

关键词： neuromorphic sensory computing multimodal sensory computing electronic sensory computing optical sensory computing

High Speed Aircraft Robust Fuzzy Controller Design Based on H_∞Performance

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Journal of Electronic Science and Technology 2017年第1期15卷 83-89页

作者： Chun-Ning yang Zhen-yang chai Quan-Jun Liu Hui Ge School of Aeronautics and Astronautics Zhejiang UniversityHangzhou 310027China Science and Technology on Space Physics Laboratory Nanjing 210000China Institute of Spaceflight Control Technology Shanghai 200000China

The dynamics of the high-speed vehicle（HSV） is partially or completely unknown because of various reasons, such as modeling errors, in-flight failure, and external disturbances. In this paper, a global stability robust fuzzy controller is designed to control the flight F-16 with uncertain perturbation. For the desired H_∞ output-feedback controllers, a necessary and sufficient condition of quadratic stability is derived with the well-established results of the Lyapunov stability theory and nonnegative matrix. The controllers not only guarantee the global asymptotically stability of the resultant closed-loop system with external disturbance and parameter perturbation, but also have a desired H∞ performance in a large flight envelop（LFE）.

关键词： desired disturbance uncertain asymptotically guarantee quadratic perturbation Performance resultant partially

Optoelectronic Synapses Based on MXene/Violet Phosphorus van der Waals Heterojunctions for Visual‑Olfactory Crossmodal Perception

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Nano-Micro Letters 2024年第6期16卷 38-52页

作者： Hailong Ma Huajing Fang Xinxing Xie Yanming Liu He Tian yang chai Center for Advancing Materials Performance From the Nanoscale(CAMP‑Nano) State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049People’s Republic of China Institute of Microelectronics and Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijing 100084People’s Republic of China Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China

The crossmodal interaction of different senses,which is an important basis for learning and memory in the human brain,is highly desired to be mimicked at the device level for developing neuromorphic crossmodal perception,but related researches are ***,we demonstrate an optoelectronic synapse for vision-olfactory crossmodal perception based on MXene/violet phosphorus(VP)van der Waals *** from the efficient separation and transport of photogenerated carriers facilitated by conductive MXene,the photoelectric responsivity of VP is dramatically enhanced by 7 orders of magnitude,reaching up to 7.7 A W^(−1).Excited by ultraviolet light,multiple synaptic functions,including excitatory postsynaptic currents,pairedpulse facilitation,short/long-term plasticity and“learning-experience”behavior,were demonstrated with a low power ***,the proposed optoelectronic synapse exhibits distinct synaptic behaviors in different gas environments,enabling it to simulate the interaction of visual and olfactory information for crossmodal *** work demonstrates the great potential of VP in optoelectronics and provides a promising platform for applications such as virtual reality and neurorobotics.

关键词： Violet phosphorus MXene Van der Waals heterojunctions Optoelectronic synapses Crossmodal perception