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Review in situ transmission electron microscope with machine learning

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Journal of Semiconductors 2022年第8期43卷 10-23页

作者： Zhiheng Cheng Chaolun Wang xing Wu Junhao chu In Situ Devices Center Shanghai Key Laboratory of Multidimensional Information ProcessingEast China Normal UniversityShanghai 200241China

Advanced electronic materials are the fundamental building blocks of integrated circuits(ICs).The microscale properties of electronic materials(e.g.,crystal structures,defects,and chemical properties)can have a considerable impact on the performance of *** characterization and analysis of the material in real time with high-spatial resolution are *** situ transmission electron microscope(TEM)with atomic resolution and external field can be applied as a physical simulation platform to study the evolution of electronic material in working *** high-speed camera of the in situ TEM generates a high frame rate video,resulting in a large dataset that is beyond the data processing ability of researchers using the traditional *** overcome this challenge,many works on automated TEM analysis by using machine-learning algorithm have been *** this review,we introduce the technical evolution of TEM data acquisition,including analysis,and we summarize the application of machine learning to TEM data analysis in the aspects of morphology,defect,structure,and *** of the challenges of automated TEM analysis are given in the conclusion.

关键词： electron microscopy machine learning in situ image analysis semiconductor

Incidence and outcomes of secondary infections in septic patients with cancer

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World Journal of Emergency Medicine 2022年第5期13卷 400-402页

作者： Shi-ning Qu Hai-jun Wang chu-lin Huang Hao Zhang Hao Wang zhen-nan Yuan Xue-zhong xing Department of Intensive Care Unit National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China

Secondary infections,also called intensive care unit(ICU)-acquired infections,are defi ned as infections occurring 48 h after admission to the ICU.[1]Critically ill patients are at a high risk of developing ventilator... 详细信息

关键词： infections patients mortality

Development of a new irradiation-embrittlement prediction model for reactor pressure-vessel steels

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Nuclear Science and Techniques 2024年第11期35卷 182-192页

作者： Qi-Bao chu Lu Sun zhen-Feng Tong Qing Wang Ministry of Ecology and Environment Nuclear and Radiation Safety CenterBeijing 100082China School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China

Predicting the transition-temperature shift(TTS)induced by neutron irradiation in reactor pressure-vessel(RPV)steels is important for the evaluation and extension of nuclear power-plant *** prediction models may fail to properly describe the embrittlement trend curves of Chinese domestic RPV steels with relatively low Cu *** on the screened surveillance data of Chinese domestic and similar international RPV steels,we have developed a new fluencedependent model for predicting the irradiation-embrittlement *** fast neutron fluence(E>1 MeV)exhibited the highest correlation coefficient with the measured TTS data;thus,it is a crucial parameter in the prediction *** chemical composition has little relevance to the TTS residual calculated by the fluence-dependent *** results show that the newly developed model with a simple power-law functional form of the neutron fluence is suitable for predicting the irradiation-embrittlement trend of Chinese domestic RPVs,regardless of the effect of the chemical composition.

关键词： Reactor pressure vessel steel Transition temperature shift Irradiation embrittlement Embrittlement trend curve Prediction model

Numerical investigation on free air blast loads generated from center-initiated cylindrical charges with varied aspect ratio in arbitrary orientation

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Defence Technology（防务技术） 2022年第9期18卷 1662-1678页

作者： chu Gao Xiang-zhen Kong Qin Fang Jian Hong Yin Wang State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLAJiangsuNanjing210007China Inner Mongolia University of Finance and Economics Inner MongoliaHohhot010070China Engineering Research Center for Safety and Protection of Explosion&Impact of Ministry of Education Southeast UniversityJiangsuNanjing211189China

In current guidelines, the free air blast loads(overpressure and impulse) are determined by spherical charges, although most of ordnance devices are more nearly cylindrical than spherical in geometry. This may result in a great underestimation of blast loads in the near field and lead to an unsafe ***, there is still a lack of systematic quantitative analysis of the blast loads generated from cylindrical charges. In this study, a numerical model is developed by using the hydrocode AUTODYN to investigate the influences of aspect ratio and orientation on the free air blast loads generated from center-initiated cylindrical charges. This is done by examining the pressure contours, the peak overpressures and impulses for various aspect ratios ranged from 1 to 8 and arbitrary orientation monitored along every azimuth angle with an interval of 5°. To characterize the distribution patterns of blast loads,three regions, i.e., the axial region, the vertex region and the radial region are identified, and the propagation of blast waves in each region is analyzed in detail. The complexity of blast loads of cylindrical charges is found to result from the bridge wave and its interaction with primary waves. Several empirical formulas are presented based on curve-fitting the numerical data, including the orientation where the maximum peak overpressure emerges, the critical scaled distance beyond which the charge shape effect could be neglected and blast loads with varied aspect ratio in arbitrary orientation, all of which are useful for blast-resistant design.

关键词： Cylindrical charge Blast loads Aspect ratio Azimuth angle Bridge wave

A multi-functional binder for high loading sulfur cathode

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Journal of Energy Chemistry 2020年第7期29卷 99-104,I0004页

作者： Ying chu Ning Chen Ximing Cui Anmin Liu Liang zhen Qinmin Pan School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina State Key Laboratory of Fine Chemicals School of Petroleum and Chemical EngineeringDalian University of TechnologyPanjin 124221LiaoningChina

Lithium sulfur(Li-S)batteries are the promising power sources,but their commercialization is significantly impeded by poor energy-storage functions at high sulfur *** we report that such an issue can be effectively addressed by using a mussel-inspired binder comprised of chitosan grafted with catecholic moiety for sulfur *** resulting sulfur cathodes possess a high loading up to 12.2 mg cm-2 but also exhibit one of the best electrochemical properties among their *** excellent performances are attributed to the strong adhesion of the binder to sulfur particles,conducting agent,current collector,and *** versatile adhesion effectively increases the sulfur loading,depresses the shuttle effect,and alleviates mechanical pulverization during cycling *** present investigation offers a new insight into high performance sulfur cathodes through a bio-adhesion viewpoint.

关键词： Li-S batteries Sulfur cathode Mussel-inspired binder Bio-adhesion High loading High performance

Microstructure and Mechanical Behavior of FeNiCoCr and FeNiCoCrMn High-Entropy Alloys Fabricated by Powder Metallurgy

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Acta Metallurgica Sinica(English Letters) 2021年第4期34卷 445-454页

作者： Chenliang chu Weiping Chen zhen Chen zhenfei Jiang Hao Wang Zhiqiang Fu Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of TechnologyGuangzhou 510640China Shantou Technician College Shantou 515041China

The present work reports a systematic investigation on phase evolution,microstructure and microstructure-property relationship of two typical face-centered cubic(FCC)structured high-entropy alloys(HEAs),FeNiCoCr and FeNiCoCrMn,prepared via mechanical alloying(MA)followed by spark plasma sintering(SPS).Following 50 h of MA,the two HEAs consisted of a mixture of FCC and body-centered cubic *** SPS,the bulk FeNiCoCr alloy showed a primary FCC phase with a small amount of Cr_(23)C_(6) and Cr_(2)O_(3) contaminants,while the bulk FeNiCoCrMn alloy was composed of a primary FCC phase with some(Cr,Mn)23C6 and MnCr_(2)O_(4) *** average grain size of the primary FCC phase in the bulk FeNiCoCr alloy was~416 nm,while that of the primary FCC phase in the bulk FeNiCoCrMn alloy was~547 *** yield strength,compressive strength and strain-to-failure of the bulk FeNiCoCr alloy are 1525 MPa,1987 MPa and 24.4%,respectively,whereas those of the bulk FeNiCoCrMn alloy are 1329 MPa,1761 MPa and 21.9%,*** suggests that the bulk FeNiCoCrMn exhibited lower strength and plasticity in comparison with the bulk FeNiCoCr ***,the smaller grain size of the primary FCC phase in the FeNiCoCr alloy is mainly responsible for the better mechanical performance.

关键词： High-entropy alloy Mechanical alloying Microstructure Strengthening Contaminants

Pulse-doubling perovskite nanowire lasers enabled by phonon-assisted multistep energy funneling

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Light(Science & Applications) 2024年第8期13卷 1645-1654页

作者： chunhu Zhao Jia Guo Jiahua Tao Junhao chu Shaoqiang Chen Guichuan xing Hunan Provincial Key Laboratory of Carbon Neutrality and Intelligent Energy School of Resource&EnvironmentHunan University of Technology and Business410205 ChangshaChina Engineering Research Center for Nanophotonics and Advanced Instrument Ministry of EducationSchool of Physics and Electronic ScienceEast China Normal University200241 ShanghaiChina Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of Macao999078 MacaoChina

Laser pulse multiplication from an optical gain medium has shown great potential in miniaturizing integrated optoelectronic *** multiple quantum wells(MQWs)structures have recently been recognized as an effective gain media capable of doubling laser pulses that do not rely on external optical *** the light amplifications enabled with pulse doubling are reported based on the perovskite MQWs thin films,the micronanolasers possessed a specific cavity for laser pulse multiplication and their corresponding intrinsic laser dynamics are still ***,a single-mode double-pulsed nanolaser from self-assembled perovskite MQWs nanowires is realized,exhibiting a pulse duration of 28 ps and pulse interval of 22 ps based on single femtosecond laser pulse *** is established that the continuous energy building up within a certain timescale is essential for the multiple population inversion in the gain medium,which arises from the slowing carrier localization process owning to the stronger exciton–phonon coupling in the smaller-n ***,the double-pulsed lasing is achieved from one fast energy funnel process from the adjacent small-n QWs to gain active region and another slow process from the spatially separated *** report may shed new light on the intrinsic energy relaxation mechanism and boost the further development of perovskite multiple-pulse lasers.

关键词： doubling energy phonon

Correlation between Microstructure and Failure Mechanism of Hyriopsis cumingii Shell Structure

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Journal of Bionic Engineering 2019年第5期16卷 869-881页

作者： zhen Zhang Jun Zhu Yajie chu zhengnian Chen Shun Guo Junqiang Xu School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China

In nature,shells exhibit remarkable high toughness and impact resistance to the external load despite their brittle main constituent and simple hierarchical *** this work,the structure of the mussel shell Hyriopsis cumingii is analyzed by scanning electron micro scope and atomic force microscope,and the macro/micro compression and impact tests are *** show that the shell has a three-layer structure:an outer cuticle layer,a prismatic layer,and a nacreous *** stiffer and load-dependent prismatic layer is conducive to improve the impact resistance of shell *** morphology after failure proves that cracks are transgranularly propagated inside the prism and aragonite platelet,and the crack deflection and platelet pullout can effectively lock the stress,thereby eventually improving the impact-resistance and toughness of the shell.

关键词： Hyriopsis cumingii shell microstructure macro/micro mechanical property crack propagation

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不同运动方式促进周围神经损伤后的功能恢复

中国组织工程研究 2025年第6期29卷 1248-1256页

作者：赵晓璇刘帅祎李奇邢政李庆雯褚晓蕾天津体育学院运动健康学院天津市301617 天津市天津医院天津市300211

背景:运动作为一种主动康复的方式可以改善周围神经损伤导致的功能障碍,而不同运动方式针对的病变部位及恢复机制不同。目的:综合分析不同运动方式在周围神经损伤功能恢复中的应用及机制。方法:应用计算机检索中国知网、PubMed数据库建... 详细信息

背景:运动作为一种主动康复的方式可以改善周围神经损伤导致的功能障碍,而不同运动方式针对的病变部位及恢复机制不同。目的:综合分析不同运动方式在周围神经损伤功能恢复中的应用及机制。方法:应用计算机检索中国知网、PubMed数据库建库时间至2024年1月期间的相关文献,英文检索词为“peripheral nerves injury,spinal cord,exercise,cerebral cortex,muscle atrophy,mirror therapy,blood flow restriction training”,中文检索词为“周围神经损伤,脊髓,大脑皮质,肌肉萎缩,有氧运动,血流限制,镜像运动”,最终纳入77篇文献进行分析。结果与结论:周围神经损伤后会引起其支配骨骼肌萎缩、相应脊髓节段病变、感觉运动皮质重塑等系统性的病理变化。有氧运动可以加强免疫反应,促进神经胶质细胞极化以及神经生长因子的释放,改善功能障碍。血流限制运动可以调节肌肉生长因子的分泌,促进肌肉生长及增强肌肉力量。镜像运动在激活大脑皮质、减少皮质重塑方面有良好的作用。不同运动方式在周围神经损伤功能恢复中具有潜在的益处,然而目前仍存在一些问题和挑战,例如运动方式的选择、运动强度和频率的控制及机制的详细解析等。

关键词：周围神经损伤脊髓大脑皮质肌肉萎缩有氧运动血流限制镜像运动机制