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Low-temperature chlorination roasting technology for the simultaneous recovery of valuable metals from spent LiCoO_(2)cathode material

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 80-91页

作者： Junjie Shi Changle Hou Jingjing dong dong chen Jianzhong Li Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

With the continuous increase in the disposal volume of spent lithium-ion batteries(LIBs),properly recycling spent LIBs has become essential for the advancement of the circular *** study presents a systematic analysis of the chlorination roasting kinetics and proposes a new two-step chlorination roasting process that integrates thermodynamics for the recycling of LIB cathode *** activation energy for the chloride reaction was 88.41 kJ/mol according to thermogravimetric analysis–derivative thermogravimetry data obtained by using model-free,model-fitting,and Z(α)function(αis conversion rate).Results indicated that the reaction was dominated by the first-order(F1)model when the conversion rate was less than or equal to 0.5 and shifted to the second-order(F2)model when the conversion rate exceeded *** conditions were determined by thoroughly investigating the effects of roasting temperature,roasting time,and the mass ratio of NH_(4)Cl to LiCoO_(2).Under the optimal conditions,namely 400℃,20 min,and NH_(4)Cl/LiCoO_(2)mass ratio of 3:1,the leaching efficiency of Li and Co reached 99.43% and 99.05%,*** of the roasted products revealed that valuable metals in LiCoO_(2)transformed into CoCl_(2) and ***,the reaction mechanism was elucidated,providing insights for the establishment of a novel low-temperature chlorination roasting technology based on a crystal structure *** technology can guide the development of LIB recycling processes with low energy consumption,low secondary pollution,high recovery efficiency,and high added value.

关键词： spent lithium-ion battery thermodynamics chlorination roasting kinetics circular economy

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自然语言处理研究综述

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新疆师范大学学报（哲学社会科学版） 2025年第2期46卷 89-111,F0002页

作者：赵铁军许木璠陈安东哈尔滨工业大学计算学部黑龙江哈尔滨150001

近年来,自然语言处理因在分析与建模人类语言任务领域取得诸多成果而备受关注。当前,大规模预训练语言模型展现出强大的对话问答和文本生成能力,带来自然语言处理研究的新一轮热潮。自然语言处理在机器翻译、文本摘要、信息抽取等领域... 详细信息

近年来,自然语言处理因在分析与建模人类语言任务领域取得诸多成果而备受关注。当前,大规模预训练语言模型展现出强大的对话问答和文本生成能力,带来自然语言处理研究的新一轮热潮。自然语言处理在机器翻译、文本摘要、信息抽取等领域应用广泛。文本首先讨论自然语言处理针对语言学四个不同层次文本信息的分析手段,对自然语言处理的基本任务组成进行概述;其次,讨论自然语言处理在具体下游任务中的应用现状,包括自然语言处理在具体任务中的应用历史、当前的研究趋势以及面临的挑战;最后,在大规模预训练语言模型研究对数据集提出更高要求的背景下,对自然语言处理领域已有的数据集及评测基准集等进行讨论。

关键词：自然语言处理句法分析语义分析机器翻译问答系统信息抽取

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A strategy to control microstructures of a Ni-based superalloy during hot forging based on particle swarm optimization algorithm

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Advances in Manufacturing 2019年第2期7卷 238-247页

作者： dong-dong chen Yong-cheng Lin Xiao-Min chen School of Mechanical and Electrical Engineering Central South University Changsha 410083 People's Republic of China State Key Laboratory of High Performance Complex Manufacturing Changsha 410083 People's Republic of China College of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha 410114 People's Republic of China

In this study, a strategy based on the particle swarm optimization (PSO) algorithm is developed to control the microstructures of a Ni-based superalloy during hot forging. This strategy is composed of three parts, namely, material models, optimality criterions, and a PSO algo rithm. The material models are utilized to predict microstructure information, such as recrystallization volume fraction and average grain size. The optimality crite? non can be determined by the designed target microstructures and random errors. The developed strategy is resolved using the PSO algorithm, which is an intelligent optimal algorithm. This algorithm does not need a derivable objective function, which renders it suitable for dealing with the complex hot forging process of alloy components. The optimal processing parameters (deformation temperature and strain rate) are obtained by the developed strategy and validated by the hot forging experiments. Uniform and fine target microstructures can be obtained using the optimized processing parameters, which indicates that the developed strategy is effective for controlling the microstructural evolution during the hot forging of the studied superalloy.

关键词： Processing parameters Microstructure Particle swarm optimization (PSO) algorithm Superalloy

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Performance analysis of variable speed tail rotors with Gurney flaps

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Chinese Journal of Aeronautics 2018年第11期31卷 2104-2110页

作者： chen dong dong HAN Lei YU National Key Laboratory of Rotorcraft Aeromechanics Nanjing University of Aeronautics and Astronautics

Gurney Flaps(GFs) are used for improving the performance of variable speed tail rotors. A validated analytical helicopter model able to predict the main and tail rotor power is utilized. The fixed height GF has substantially small influence on the tail rotor power in hover and low to medium speed forward flight, and can obtain significant power reduction in high speed *** ability can be enhanced by decreasing the tail rotor speed. With the deployment of GF, the collective pitch of the tail rotor decreases, and the maximum tail rotor thrust increases. The GF can compensate the reduction of the maximum thrust by the decrease in the tail rotor speed. The GF with a height of 5% of the chord length can almost remedy 50% of the thrust reduction introduced by decreasing 10% of the tail rotor speed. With the increase of GF height, the maximum thrust generated by the tail rotor increases. The GF with larger height can cause the increase in the tail rotor power in hover and low to medium speed flight. The retractable GF can obtain more power savings than the fixed height GF. However, the benefit is substantially small even in high speed flight. Considering the side effects introduced by the active GF, the fixed height GF may be more preferable. The mechanism for the retractable GF to generate more tail rotor thrust is to increase the lift in advancing side due to the higher dynamic pressure.

关键词： Tail rotor Variable speed Performance Gurney flap Tail rotor thrust Flap height High speed flight

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Phase Transition Characters and Thermodynamics Modeling of the Newly-Discovered wⅡ- and Post-Spinel Si_3N_4 Polymorphs: A First-Principles Investigation

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Acta Metallurgica Sinica(English Letters) 2013年第2期26卷 131-136页

作者： Benhai YU dong chen College of Physics and Electronic Engineering Xinyang Normal University

The equilibrium lattice constants, elastic constants and elastic moduli of wll- and post-spinel Si3Na have been investigated in the pressure ranges of 0-40 GPa and 160-240 GPa, respectively. These two phases are found to be dynamically stable. The post-spinel phase is one of the strongest materials yet investigated under extreme compressions. Some fundamental properties and phase transition characters are evaluated from the quasi-harmonic approximation. The transition pressures from the γ phase to the post-spinel phase are 152.5 GPa （at 300 K） and 181.8 GPa （at 1500 K）. The phase transition pressures of theβ→wll and γ→postspinel transitions increase with the rise of temperature; hence, at higher temperature it requires higher pressure to synthesize post-spinel Si3Na. The heat capacity, thermal expansion and bulk modulus of the new phases are computed as functions of pressure and temperature. The heat capacity of post-spinel Si3Na is large at high temperature and only weakly pressure dependent.

关键词： First-principles Nitride Elastic constant Phase transition

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Lasker takes two——Discoveries were honored for defining major components of our lymphoid system

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Science China(Life Sciences) 2019年第11期62卷 1532-1533页

作者： chen dong Institute for Immunology and School of Medicine Tsinghua University

On September 10,2019,Albert Lasker Award for Basic Medical Research was given to *** *** (Emory University School of Medicine,USA) and Jacques Miller(Emeritus,The Walter and Eliza Hall Institute of Medical Research,Australia) for identification of"two distinct classes of lymphocytes,B and T cells".They were credited for having"launched the course of modern immunology (http://***/awards/show/b-and-t-cells-organizing-principle-adaptive-immune-system/).

关键词： Walter Basic system

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Targeting the immune system: a new horizon of cancer therapies

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National Science Review 2015年第1期2卷 10-12页

作者： chen dong School of Medicine Tsinghua University

INTRODUCTION he immune system is our trustworthy army of defense against invasion of *** the irst line in this army,the innate immune system,composed of myeloid cells(dendritic cells and macrophages),some lymphocytes(NK cells and innate lymphocytes as well as some types of T lymphocytes such as NKT cells andγδT cells)and other cells in our body,can quickly mount

关键词： cell a new horizon of cancer therapies Targeting the immune system MDSC CTLA

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A P300 based online brain-computer interface system for virtual hand control

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Journal of Zhejiang University-Science C(Computers and Electronics) 2010年第8期11卷 587-597页

作者： Wei-dong chen Qiushi Academy for Advanced Studies Zhejiang University Hangzhou 310027 China School of Computer Science and Teehnology Zhejiang University Hangzhou 310027 China Department of Biomedical Engineering Zhejiang University Hangzhou 310027 China MRI Unit Department of Psycbiatry Columbia University College of Physicians and Surgeons New York NY 10032 USA New York State Psychiatric Institute New York NY 10032 USA

Brain-computer interface (BCI) is a communication system that can help lock-in patients to interact with the outside environment by translating brain signals into machine *** present work provides a design for a virtual reality (VR) based BCI system that allows human participants to control a virtual hand to make gestures by P300 signals,with a positive peak of potential about 300 ms posterior to the onset of target *** this virtual environment,the participants can obtain a more immersed experience with the BCI system,such as controlling a virtual hand or walking around in the virtual *** of modeling the virtual hand and analyzing the P300 signals are also described in *** matching and support vector machine were used as the P300 classifier and the experiment results showed that both algorithms perform well in the *** a short time of practice,most participants could learn to control the virtual hand during the online experiment with greater than 70% accuracy.

关键词： Brain-computer interface (BCI) Electroencephalography (EEG) P300 Virtual reality (VR) Template matching Support vector machine (SVM)

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Laminar-to-Turbulence Transition Revealed Through a Reynolds Number Equivalence

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Engineering 2019年第3期5卷 576-579页

作者： Xiao dong chen School of Chemical and Environmental Engineering Soochow University Suzhou 215123 China

Flow transition from laminar to turbulent mode (and vice versa)—that is, the initiation of turbulence—is one of the most important research subjects in the history of engineering. Even for pipe flow, predicting the onset of turbulence requires sophisticated instrumentation and/or direct numerical simulation, based on observing the instantaneous flow structure formation and evolution. In this work, a local Reynolds number equivalence c (ratio of local inertia effect to viscous effect) is seen to conform to the Universal Law of the Wall, where c = 1 represents a quantitative balance between the abovementioned two effects. This coincides with the wall layer thickness (y+= 1, where y+ is the dimensionless distance from the wall surface defined in the Universal Law of the Wall). It is found that the characteristic of how the local derivative of c against the local velocity changes with increasing velocity determines the onset of turbulence. For pipe flow, c - 25, and for plate flow, c - 151.5. These findings suggest that a certain combination of c and velocity (nonlinearity) can qualify the source of turbulence (i.e., generate turbulent energy). Similarly, a re-evaluation of the previous findings reveals that only the geometrically narrow domain can act locally as the source of turbulence, with the rest of the flow field largely being left for transporting and dissipating. This understanding will have an impact on the future large-scale modeling of turbulence.

关键词： Local Reynolds number equivalence Flow transition from laminar to turbulent mode Universal Law of the Wall Pipe flow Plate Modeling

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Nobel goes to immune checkpoint-Innovative cancer treatment by immunotherapy

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Science China(Life Sciences) 2018年第11期61卷 1445-1450页

作者： Jing Li chen dong Institute for Immunology and School of Medicine Tsinghua UniversityBeijing 100084China Beijing Key Lab for Immunological Research on Chronic Diseases Beijing 100084China

The 2018 Nobel Prize in Physiology or Medicine was awarded to both Professors James *** and Tasuku Honjo for their“discovery of cancer therapy by inhibition of negative immune regulation”.Antibody therapies targeting negative immune receptors,or immune checkpoims,have shown substantial and long-lasting clinical efficacy in many cancer patients and have prolonged their lives.

关键词： cancer immune negative Nobel efficacy

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