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Selective interfacial bonding and thermal conductivity of diamond/Cu-alloy composites prepared by HPHT technique

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International Journal of Minerals,Metallurgy and Materials 2012年第4期19卷 364-371页

作者： Hui Chen Cheng-chang jia Shang-jie Li Xian jia Xia Yang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Shenzhen Haimingrun Industrial Co. Ltd. Shenzhen 518126 China

Cu-based and Cu-alloy-based diamond composites were made by high-pressure-high-temperature （HPHT） sintering with the aim of maximizing the thermal conductivity of the composites. Improvements in interfacial bonding strength and thermo-physical properties of the composites were achieved using an atomized copper alloy with minor additions of Co, Cr, 13, and Ti. The thermal conductivity （TC） oh- mined exhibited as high as 688 W.m-1.K-1, but also as low as 325 W.m-1.K-l. A large variation in TC can be rationalized by the discrepancy of diamond-matrix interfacial bonding. It was found from fractography that preferential bonding between diamond and the Cu-alloy matrix occurred only on the diamond {100} faces. EDS analysis and Raman spectra suggested that selective interfacial bonding may be attributed to amorphous carbon increasing the wettability between diamond and the Cu-alloy matrix. Amorphous carbon was found to significantly affect the TC of the composite by interface modification.

关键词： metallic matrix composites diamonds copper alloys interfacial bonding thermal conductivity

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法国英语教材价值观呈现研究

外语学刊 2025年第1期 78-85页

作者：谈佳北京外国语大学法语语言文化学院北京100089

本文梳理了法国阿歇特出版社中学英语教材Teen Time的价值观呈现方式。研究发现,教材选择呈现的价值元素,不仅对应欧洲价值观调查揭示的法国人坚持的价值观,同时也是英语素材所承载的目的语国家所认同的价值观,反复出现的“社团活动、... 详细信息

本文梳理了法国阿歇特出版社中学英语教材Teen Time的价值观呈现方式。研究发现,教材选择呈现的价值元素,不仅对应欧洲价值观调查揭示的法国人坚持的价值观,同时也是英语素材所承载的目的语国家所认同的价值观,反复出现的“社团活动、规则意识、文化多样性和生态保护”,反映出在与他人、与社会以及与自然关系上法国与英语国家的共同态度和期许。Teen Time通过标题引领、图文呼应和文化板块拓展深入的呈现方式,传递价值观,并设置层层任务,让学习者在行动中体验,将价值观内化于心、外化于行,实现外语教学的育人功能,其价值观的选取角度和呈现方式对我国中学外语教材的编写具有一定的借鉴意义。

关键词：价值观呈现方式法国英语教材中学行动中体验

Extended-state-observer-based robust torsional vibration suppression for rolling mill main drive system with input saturation

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Journal of Iron and Steel Research International 2023年第5期30卷 985-993页

作者： jia-qiang Chen Shu-zong Chen chang-chun Hua Cheng jia Cheng Qian Institute of Electrical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004HebeiChina

A robust torsional vibration suppression strategy is proposed for the main drive system of the rolling mill subject to uncertainties,disturbances and input *** given model information incorporated into observer design,an extended state observer that relies only on roller speed measurements is developed to estimate the system states and lumped uncertainties of the rolling mill main drive *** handle the motor torque saturation,an auxiliary signal system with the same order as the plant is *** error between the control input and plant input is taken as the input of the constructed auxiliary system,and a number of signals are generated to compensate for the effect of the motor torque ***,a robust output feedback controller is introduced to obtain better transient and steady-state performance of the rolling mill main drive system and the stability of the closed-loop system is strictly proved via Lyapunov ***,comparative simulations are performed to verify the effectiveness and superiority of the proposed control strategy.

关键词： Rolling mill Main drive system Vibration suppression Extended state observer Input saturation

Effect of sintering parameters on the microstructure and thermal conductivity of diamond/Cu composites prepared by high pressure and high temperature infiltration

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International Journal of Minerals,Metallurgy and Materials 2013年第2期20卷 180-186页

作者： Hui Chen Cheng-chang jia Shang-jie Li School of Materials Science and Engineering University of Science and Technology Beijing Shenzhen Haimingrun Industrial Co. Ltd.

Pure Cu composites reinforced with diamond particles were fabricated by a high pressure and high temperature （HPHT） infiltration technique. Their microstructural evolution and thermal conductivity were presented as a function of sintering parameters （temperature, pressure, and time）. The improvement in interfacial bonding strength and the maximum thermM conductivity of 750 W/（m.K） were achieved at the optimal sintering parameters of 1200℃, 6 GPa and 10 min. It is found that the thermal conductivity of the composites depends strongly on sintering pressure. When the sintering pressure is above 6 GPa, the diamond skeleton is detected, which greatly contributes to the excellent thermal conductivity.

关键词： metallic matrix composites particle reinforced composites copper diamonds infiltration microstructuralevolution thermal conductivity

Numerical analysis of the correlation between fluid dynamic modes and hydrodynamic noise in flows around a three-dimensional circular cylinder

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Journal of Hydrodynamics 2024年第1期36卷 119-129页

作者： jia-jia Qin Ming-xin Zou Yuan Zhuang de-cheng Wan Computational Marine Hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Wuhan Second Ship design and Research Institute Wuhan430205China

The flow around a circular cylinder for Re=1000 is characterized by flow separation and Karman vortex *** typical flow features can be captured to study the correlation between fluid fields and sound *** this paper,the three-dimensional circular cylinder is taken as the research object,and the probes of surface fluctuating pressure and far field sound pressure are arranged every 10°.The directional diagram and the coherence of fluctuating pressure and sound pressure are *** relationship between the flow mode and hydrodynamic noise is studied by using dynamic mode decomposition(DMD).The characteristics of the dipole and quadrupole sound source term of a long span cylinder are *** results show that at the angles between 30°–120°and 190°–350°,the fluctuating pressure contributes more to the generation of dipole *** quadrupole sound source shows three-dimensional effects,which is more obvious in a cylinder with large spanwise length.

关键词： Pressure coherence dynamic mode decomposition flow-sound correlation circular cylinder

Inhibition of the NLRP3 inflammasome attenuates spiral ganglion neuron degeneration in aminoglycoside-induced hearing loss

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Neural Regeneration Research 2025年第10期20卷 3025-3039页

作者： jia Fang Zhuangzhuang Li Pengjun Wang Xiaoxu Zhang Song Mao Yini Li Dongzhen Yu Xiaoyan Li Yazhi Xing Haibo Shi Shankai Yin department of Otolaryngology Head and Neck Surgery Shanghai Sixth People’s Hospital Affiliated to Shanghai Jiao Tong University School of MedicineOtolaryngology Institute of Shanghai Jiao Tong UniversityShanghai Key Laboratory of Sleep Disordered BreathingShanghaiChina department of Otorhinolaryngology-Head and Neck Surgery Shanghai Children’s HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina

Aminoglycosides are a widely used class of antibacterials renowned for their effectiveness and broad antimicrobial ***,their use leads to irreversible hearing damage by causing apoptosis of hair cells as their direct *** addition,the hearing damage caused by aminoglycosides involves damage of spiral ganglion neurons upon *** investigate the mechanisms underlying spiral ganglion neuron degeneration induced by aminoglycosides,we used a C57BL/6J mouse model treated with *** found that the mice exhibited auditory deficits following the acute loss of outer hair *** ganglion neurons displayed hallmarks of pyroptosis and exhibited progressive degeneration over *** profiling of these neurons showed significant upregulation of genes associated with inflammation and immune response,particularly those related to the NLRP3 *** of the canonical pyroptotic pathway in spiral ganglion neurons was observed,accompanied by infiltration of macrophages and the release of proinflammatory *** intervention targeting NLRP3 using Mcc950 and genetic intervention using NLRP3 knockout ameliorated spiral ganglion neuron degeneration in the injury *** findings suggest that NLRP3 inflammasome-mediated pyroptosis plays a role in aminoglycoside-induced spiral ganglion neuron *** of this pathway may offer a potential therapeutic strategy for treating sensorineural hearing loss by reducing spiral ganglion neuron degeneration.

关键词： degeneration hearing loss macrophages Mcc950 neuroinflammation NLRP3 inflammasome ototoxicity pyroptosis sensorineural hearing loss spiral ganglion neuron

Dynamic modeling approach to analyze user churn in a large P2P downloading system

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The Journal of China Universities of Posts and Telecommunications 2013年第1期20卷 19-25页

作者： HUANG Dan ZHENG Yi CHEN chang-jia School of Electronics and Information Engineering Beijing Jiaotong University

Characterizing the features of user churn is crucial to the sustainable development of peer-to-peer （P2P） systems where peers join and leave at any arbitrary time. This paper analyzes the user churn in a P2P downloading system named QQXuanfeng by using the fine-grained log analysis over 60 days. It shows that the online and offline duration is related to up （arrive） time and down （depart） time respectively. A continuous ON/OFF process, which exhibits the diurnal patterns of users, is simulated using the churn model. In particular, the dynamic departure rate is proposed to give insight into the distribution of online duration. Further more, considering the heterogeneity of users, we cluster users based on the similarity of redefined user availability. As an example of application of this model, a high availability overlay is constructed and evaluated based on the clustering.

关键词： P2P network user chum clustering

A Glycosylated and Catechol-crosslinkedε-Polylysine Hydrogel:Simple Preparation and Excellent Wound Hemostasis and Healing Properties

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Chinese Journal of Polymer Science 2022年第9期40卷 1110-1119页

作者： Lin Teng Zheng-Wei Shao Yu-Shi He jia-Yu Lu de-Rong Zou Chuan-Liang Feng chang-Ming Dong School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Key Laboratory of Electrical Insulation and Thermal AgingShanghai Jiao Tong UniversityShanghai 200240China department of Stomatology Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai Jiao Tong UniversityShanghai 200233China School of Chemistry and Chemical Engineering Shanghai Electrochemical Energy Devices Research CenterShanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai 200240China

Commercial tissue adhesives have been widely applied in wound hemostats and dressings while enhancing the hemostasis and healing capabilities is challenging to meet clinical ***,we designed the glucose-and catechol-functionalized derivatives from commercialε-polylysine(EPL)and prepared the hydrogels by simple amidation and catechol-crosslinking reactions,which have larger swelling ratios of 220%–240%,suitable microporous size of about 6–8µm,and tissue adhesion strength of about 20–40 *** hemolysis,cytotoxicity,and cellular double-staining assays indicate that those hydrogels had good biocompatibility and the H-3 hydrogel with higher glucose content gave a lower hemolysis ratio of 0.73%±0.14%.The blood-clotting index,blood cell attachment and adhesion studies showed those hydrogels had fast blood-coagulation,resulting in excellent hemostasis performance with a short hemostatic time of 38–46 s and less blood loss of 19%–34%in a liver hemorrhage model.A full-thickness rat-skin defect model further demonstrates that the H-3 hydrogel achieved fast wound healing with a wound closure of 70.0%±2.7%on postoperative day 7 and nearly full closure on day ***,the hydroproline level that denotes the collagen production reached a higher one of 7.24±0.55µg/mg comparable to that in normal skins on day 14,evidencing the wound healing was close to completion in the H-3 ***,this work provides a simple method to construct a glycosylated and catechol-functionalized hydrogel platform from commercial EPL,holding translational potentials in wound hemostats and dressings.

关键词： Polylysine hydrogel Glycosylation Mussel-mimetic Hemostasis Wound dressing

A Time-dependent Interaction Problem Between an Electromagnetic Field and an Elastic Body

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Acta Mathematicae Applicatae Sinica 2020年第1期36卷 95-118页

作者： chang-kun WEI jia-qing YANG Bo ZHANG Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Mathematics and Statistics Xi’an Jiaotong UniversityXi’an 710049China

This paper considers the scattering of a time-dependent electromagnetic plane wave by a bounded elastic *** appropriate decomposition of the coupling interface conditions is proposed according to the Voigt’s model between the electromagnetic and elastic *** original unbounded scattering problem is equivalently reduced into an initial-boundary value problem in a bounded domain by introducing an exact transparent boundary condition(TBC)on a sufficiently large *** use of the Lax-Milgram lemma,the abstract inversion theorem of Laplace transform and the energy method,we verify the well-posedness and stability for the reduced ***,a priori estimates are established for the electromagnetic field and elastic displacement by taking special test functions directly in the time domain variational formulation.

关键词： electromagnetic elastic Laplace transform Lax-Milgram lemma energy method well-posedness