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Screening-current-induced magnetic fields and strains in a compact REBCO coil in self field and background field

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Superconductivity 2024年第1期9卷 35-49页

作者： Yufan yan Donghui Jiang Peng Song Jeonghwan Park Seungyong Hahn yunfei Tan Timing Qu Department of Electrical and Computer Engineering Seoul National UniversitySeoul 08826Republic of Korea State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China High Magnetic Field Laboratory Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China

REBa_(2)Cu_(3)O_(7−x)(REBCO)coated conductors,owing to its high tensile strength and current‐carrying ability in a background field,are widely regarded a promising candidate in high‐field *** the great potentials,recent studies have highlighted the challenges posed by screening currents,which are featured by a highly nonuniform current distribution in the superconducting *** this paper,we report a comprehensive study on the behaviors of screening currents in a compact REBCO coil,specifically the screeningcurrent‐induced magnetic fields and *** were carried out in the self‐generated magnetic field and a background field,*** the self‐field condition,the full hysteresis of the magnetic field was obtained by applying current sweeps with repeatedly reversed polarity,as the nominal center field reached 9.17 T with a maximum peak current of 350 *** a background field of 23.15 T,the insert coil generated a center field of 4.17 T with an applied current of 170 ***,a total center field of 32.58 T was achieved before *** the sequential model and the coupled model considering the perpendicular field modification due to conductor deformation are *** comparative study shows that,for this coil,the electromagnetic–mechanical coupling plays a trivial role in self‐field conditions up to 9 *** contrast,with a high axial field dominated by the background field,the coupling effect has a stronger influence on the predicted current and strain *** discussions regarding the role of background field on the strains in the insert suggest potential design strategies to maximize the total center field.

关键词： Electromagnetic-mechanical analysis High‐field insert coil REBCO coated conductor Screening‐current‐induced magnetic field Screening‐current‐induced stress

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中厚板超声波探伤缺陷机理分析及控制措施

冶金信息导刊 2017年第2期54卷 24-26页

作者：王传财王东柱魏运飞齐岩王坤黄少帅白松莲何元春郑翠军闫智平王新秦皇岛首秦金属材料有限公司河北秦皇岛066326

超声波探伤是检验中厚板内部缺陷的主要方法，能够造成探伤不合格的缺陷主要包括裂纹、偏析、夹杂物。结合秦皇岛首秦金属材料有限公司生产情况，分析了中厚板探伤缺陷的机理，发现钢中的氢含量、铸坯质量、生产工艺是影响中厚板探伤质... 详细信息

超声波探伤是检验中厚板内部缺陷的主要方法，能够造成探伤不合格的缺陷主要包括裂纹、偏析、夹杂物。结合秦皇岛首秦金属材料有限公司生产情况，分析了中厚板探伤缺陷的机理，发现钢中的氢含量、铸坯质量、生产工艺是影响中厚板探伤质量的主要影响因素。通过有效控制上述因素，可显著提高中厚板的探伤合格率。

关键词：中厚板超声波探伤机理措施

生理学虚拟和真实实验有效结合的教学实践和体会

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青海大学学报（自然科学版） 2013年第1期31卷 95-97页

作者：汪晓筠王毓洁王建新吴穹严云飞曹成珠马祁生青海大学医学院青海西宁810001

针对传统生理学实验教学中存在的一些突出问题,将虚拟实验技术应用到真实实验教学中,设计出虚拟和真实有效结合的生理学实验教学模式,通过对我校2011级临床医学专业180名本科生教学实践,体会这是一次有益的实验教学尝试,它较大程度地发... 详细信息

针对传统生理学实验教学中存在的一些突出问题,将虚拟实验技术应用到真实实验教学中,设计出虚拟和真实有效结合的生理学实验教学模式,通过对我校2011级临床医学专业180名本科生教学实践,体会这是一次有益的实验教学尝试,它较大程度地发挥了各自的优势,提高了实验教学效果。

关键词：生理学实验教学虚拟实验真实实验结合

Phononic origin of structural lubrication

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Friction 2023年第6期11卷 966-976页

作者： Yun DONG Yongkang WANG Zaoqi DUAN Shuyu HUANG Yi TAO Xi LU yan ZHANG Yajing KAN Zhiyong WEI Deyu LI yunfei CHEN Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjing211189China Department of Mechanical Engineering Vanderbilt UniversityNashville37235-1592USA

Atomistic mechanisms of frictional energy dissipation have attracted significant ***,the dynamics of phonon excitation and dissipation remain elusive for many friction *** systematic fast Fourier transform(FFT)analyses of the frictional signals as a silicon tip sliding over a graphite surface at different angles and velocities,we experimentally demonstrate that friction mainly excites non-equilibrium phonons at the washboard frequency and its *** molecular dynamics(MD)simulations,we further disclose the phononic origin of structural lubrication,i.e.,the drastic reduction of friction force as the contact angle between two commensurate surfaces *** commensurate contacting states,friction excites a large amount of phonons at the washboard frequency and many orders of its harmonics that perfectly match each other in the sliding tip and substrate,while for incommensurate cases,only limited phonons are generated at mismatched washboard frequencies and few low order harmonics in the tip and substrate.

关键词： phononic friction washboard frequency structural lubrication commensurate and incommensurate interfaces

Wearable Alignment‑Free Microfber‑Based Sensor Chip for Precise Vital Signs Monitoring and Cardiovascular Assessment

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Advanced Fiber Materials 2022年第3期4卷 475-486页

作者： Liangye Li yunfei Liu Changying Song Shunfeng Sheng Liuyang yang Zhijun yan Dora Juan Juan Hu Qizhen Sun School of Optical and Electronic Information and National Engineering Laboratory for Next Generation Internet Access System(NGIA)and Wuhan National Laboratory for Optoelectronics(WNLO) Huazhong University of Science and TechnologyWuhan 430074HubeiChina Institute for Infocomm Research Singapore 138632Singapore

Continuous pulse wave signals monitoring is the essential basis for clinical cardiovascular diagnosis and *** researches show the majority of current electronic pulse sensors usually face challenges in electrical safety concern,poor durability and demanding precision in position ***,a highly sensitive,inherently electrical safe,robust and alignment-free device is highly ***,we present a wearable alignment-free microfber-based sensor chip(AFMSC)for precise vital signs monitoring and cardiovascular health *** AFMSC comprises an optical micro/nano fber sensor(MNF)and a fexible soft liquid sac while the MNF sensor is used to perceive the physiological signals and the liquid sac is used to eliminate the *** real-time and accurate monitoring of the pulse signals was realized by tracking the optical power variation of transmitted light from ***,the cardiovascular vital signs extracted from radial artery pulse signals were used to evaluate cardiovascular health condition and the results were in accordance with human physiological ***,the pulse signals from diferent arterial area,the respiration signals from chest and the radial pulse signals before and after exercise were detected and *** non-invasive,continuous and accurate monitoring of cardiovascular health based on the reported wearable and alignment-free device is promising in both ftness monitoring and medical diagnostics for cardiovascular disease prevention and diagnosis.

关键词： Optical microfber sensor Wearable,alignment-free Physiological signal Cardiovascular health

低氧环境下粘附因子与动脉粥样硬化相关关系的研究

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高原医学杂志 2014年第4期24卷 15-17页

作者：李正娥曹成珠李生花王建新严云飞耿排力张秋梅青海红十字医院 810000 青海大学医学院基础医学部 810001 青海省玉树州人民医院 815003

目的:检测血清可溶性ICAM-1、VCAM-1、E-选择素、P-选择素表达水平与高原地区动脉粥样硬化形成的相关性。方法:利用酶联吸附免疫法对西宁、玉树和果洛地区动脉粥样硬化患者(动脉粥样硬化组42例)及健康对照者(对照组40例)进行血清可溶性I... 详细信息

目的:检测血清可溶性ICAM-1、VCAM-1、E-选择素、P-选择素表达水平与高原地区动脉粥样硬化形成的相关性。方法:利用酶联吸附免疫法对西宁、玉树和果洛地区动脉粥样硬化患者(动脉粥样硬化组42例)及健康对照者(对照组40例)进行血清可溶性ICAM-1、VCAM-1、E-选择素、P-选择素表达水平的检测。结果:ICAM-1、VCAM-1、E-选择素及P-选择素表达与西宁、玉树或果洛动脉粥样硬化患者患病具有明显相关性;但是ICAM-1、VCAM-1、E-选择素及P-选择素各因子表达在西宁、玉树或果洛高海拔正常对照组、动脉粥样硬化患者组之间无明显差异性。结论:血清可溶性ICAM-1、VCAM-1、E-选择素及P-选择素与高原动脉粥样硬化的形成无关。

关键词：低氧粘附因子动脉粥样硬化

Comparative Transcriptome Analysis of Salt-Stress-Responsive Genes in Rice Roots

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Phyton-International Journal of Experimental Botany 2023年第1期92卷 237-250页

作者： Rui Song yan Huang Xin Ji yunfei Wei Qiuyuan Liu Shumei Li Juan Liu Pengfei Dong College of Agronomy Henan Agricultural UniversityZhengzhou450046China Henan Production Technology Promotion Center of Chinese Herbal Medicine Zhenzhou450000China Xinyang Agriculture and Forestry University Xinyang464000China

Soil salinity greatly impairs plant growth and crop ***(Oryza sativa L.)is a salt-sensitive *** better understand the molecular mechanisms of salt tolerance in roots,the BGISEQ-500 sequencing platform was employed to elucidate transcriptome changes in rice roots after 0,3,24,and 72 h of salt *** results showed that root K+content decreased and Na+content increased rapidly after the initial stage of salt stress,but that fresh and dry weight in root did not significantly *** to the control(no salt stress),1,292,453,and 486 differentially expressed genes(DEGs)were upregulated,respectively,and 939,894,and 646 DEGs were downregulated,respectively,after 3,24,and 72 h of salt *** number of DEGs was higher during the early stage of salt stress(3 h)than in later stages(24 and 72 h).A number of DEGs involved in the response and adaptation to salt stress were related to protein kinase and calcium-binding,plant hormone signaling and metabolism,transcriptional regulation,metabolic pathways,antioxidant activity,and ion *** of these DEGs were activated during the early stage of salt stress(3 h).The present study reports candidate salt-stressresponsive genes with the potential to genetically improve salt tolerance in rice elsewhere.

关键词： Rice RNA-seq salt-responsive genes ion homeostasis

Direct Radiative Effects of Dust Aerosols over Northwest China Revealed by Satellite-Derived Aerosol Three-Dimensional Distribution

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Journal of Meteorological Research 2022年第5期36卷 767-778页

作者： Rui JIA Yuzhi LIU yan LI Jun LI Xiaolin HU Ronglu GAO yunfei TIAN yanling SUN Nannan MU Minfen ZHAO Collaborative Innovation Center for Western Ecological Safety Lanzhou UniversityLanzhou 7300002 Zibo Meteorological Bureau Zibo 2550003 Shandong Meteorological Service Center Jinan 250000

Northwest China is recognized as a main source and a major transport channel of dust aerosols in East *** a fragile ecological environment,this region is quite sensitive to global climate *** on the satellite-derived aerosol three-dimensional distribution,the direct radiative effects of dust aerosols over Northwest China are *** over Northwest China are mainly distributed in the Tarim Basin,Junggar Basin,Gobi Desert,and Loess *** aerosol extinction coefficients are greater than 0.36 km-1 over the Tarim Basin and 0.16 km^(-1) over the Gobi Desert and Loess Plateau,decreasing with *** over Northwest China are mainly composed of pure dust and polluted *** dust aerosols can modify the horizontal temperature gradient,vertical thermodynamic structure,and diurnal temperature range by absorbing and scattering shortwave radiation and emitting longwave *** the column atmosphere,the radiative effect of dust aerosols shows heating effect of approximately 0.3 K day^(-1) during the daytime and cooling effect of approximately-0.4 K day^(-1) at *** the vertical direction,dust aerosols can heat up the lower atmosphere(0.5–1.5 K day^(-1))and cool down the upper atmosphere(about-1.0 K day^(-1))during the daytime,while they cool down the lower atmosphere(-3 to-1.5 K day^(-1))and heat up the upper atmosphere(1–1.5 K day^(-1))at *** are also significant lateral and vertical variations in the dust radiative effects corresponding to their spatial *** study provides some scientific basis for reducing uncertainty in the investigation of aerosol radiative effects and provides observation evidence for simulation studies.

关键词： aerosol three-dimensional distribution direct radiative effect Northwest China

Glycerol solutions of highly concentrated biomineral counter-ions towards water-responsive mineralization: Demonstration on bacterial cellulose and its application in hard tissue repair

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Nano Research 2024年第3期17卷 2154-2163页

作者： yunfei Zhao Xiaohao Liu Zhi Zhou Chaobo Feng Nan Luo Jiajun yan Shuo Tan yang Lu Feng Chen Bing-Qiang Lu Shisheng He Department of Orthopedic Spinal Pain Research InstituteShanghai Tenth People’s HospitalSchool of MedicineTongji UniversityShanghai 200072China Department of Preventive Dentistry Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineCollege of StomatologyShanghai Jiao Tong UniversityNational Center for StomatologyNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of StomatologyShanghai Research Institute of StomatologyShanghai 200011China

Mineralization has found widespread use in the fabrication of composite biomaterials for hard tissue *** current mineralization processes are mainly carried out in neutral aqueous solutions of biomineral counter-ions(a pair of cation and anion that form the corresponding minerals at certain conditions),which are stable only at very low *** typically results in inefficient mineralization and weak control over biomineral ***,we find that,in the organic solvent glycerol,a variety of biomineral counter-ions(e.g.,Ca/PO_(4),Ca/CO_(3),Ca/SO_(4),Mg/PO_(4),or Fe/OH)corresponding to distinct biominerals at significantly high concentrations(up to hundreds-fold greater than those of simulated body fluid(SBF))are able to form translucent and stable solutions(mineralizing solution of highly concentrated counter-ions(MSCIs)),and mineralization can be triggered upon them with external solvents(e.g.,water or ethanol).Furthermore,with pristine bacterial cellulose(BC)membrane as a model,we demonstrate an effective and controllable mineralization performance of MSCIs on organic *** approach not only forms the homogeneous biominerals on the BC fibers and in the interspaces,but also provides regulations over mineralization rate,mineral content,phase,and *** resulting mineralized BC membranes(MBCs)exhibit high cytocompatibility and favor the proliferation of rat bone marrow mesenchymal stem cells(rBMSC).Following this,we prepare a mineralized bone suture(MBS)from MBC for non-weight bearing bone fixation,which then is tested on a rabbit median sternotomy *** shows firm fixation of the rabbit sternum without causing discernible toxicity or inflammatory *** study,by extending the mineralization to the organic solution system of highly concentrated counter-ions,develops a promising strategy to design and build targeted mineral-based composites.

关键词： biomineralization organic solvent bacterial cellulose(BC) hard tissue repair