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

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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The PHYB–FOF2–VOZ2 module functions to finetune flowering in response to changes in light quality by modulating FLC expression in Arabidopsis

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Plant Communications 2024年第7期5卷 231-250页

作者： Lina qu Ming Zhong Feifei Duan Xinmei Li Jiaxin Yang quanyu Zhou Dongying Tang Reqing He Xuanming Liu Xiaoying Zhao College of Biology Hunan Province Key Laboratory of Plant Functional Genomics and Developmental RegulationHunan Engineering and Technology Research Center of Hybrid RapeseedHunan UniversityChangsha 410082China Shenzhen Institute Hunan UniversityShenzhen 518057China These authors contributed equally to this article

Proper timing of flowering under different environmental conditions is critical for plant *** quality is a pivotal environmental cue that plays a critical role in flowering *** tend to flower late under light with a high red(R)/far-red(FR)light ratio but early under light with a low R/FR light ***,how plants fine-tune flowering in response to changes in light quality is not well ***,we demonstrate that F-box of Flowering 2(FOF2),an autonomous pathway–related regulator,physically interacts with VASCULAR PLANT ONE-ZINC FINGER 1 and 2(VOZ1 and VOZ2),which are direct downstream factors of the R/FR light receptor phytochrome B(PHYB).We show that PHYB physically interacts with FOF2,mediates stabilization of the FOF2 protein under FR light and end-of-day FR light,and enhances FOF2 binding to VOZ2,which leads to degradation of VOZ2 by SCF^(FOF2) E3 *** contrast,PHYB mediates degradation of FOF2 protein under R light and end-of-day R *** interaction studies demonstrated that FOF2 functions downstream of PHYB to promote FLC expression and inhibit flowering under both high R/FR light and simulated shade conditions,processes that are partially dependent on VOZ *** together,our findings suggest a novel mechanism whereby plants fine-tune flowering time through a PHYB–FOF2–VOZ2 module that modulates FLC expression in response to changes in light quality.

关键词： PHYB FOF2 VOZ proteins FLC light quality flowering time

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timing and Spectral Analysis of the Black Hole X-Ray Binary MAXI J1803-298 with Insight-HXMT Data

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Research in Astronomy and Astrophysics 2024年第6期24卷 209-224页

作者： Ying-Chen Xu Jin-Lu qu MMéndez Rui-Can Ma Long Ji Liang Zhang Yue Huang Qing-Cui Bu Li-Ming Song Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Kapteyn Astronomical Institute University of GroningenP.O.BOX 8009700 AV GroningenThe Netherlands Dongguan Neutron Science Center Dongguan 523808China School of Physics and Astronomy Sun Yat-Sen UniversityZhuhai 519082China Institut für Astronomie und Astrophysik Kepler Center for Astro and Particle PhysicsEberhard Karls UniversitätSand 1D-72076 TübingenGermany

We present a comprehensive analysis of the 2021 outburst of MAXI J1803–298 utilizing observations of the Insight-Hard X-ray Modulation Telescope(Insight-HXMT)spanning from the low hard state to the high soft *** the Insight-HXMT data set,compared to the previous work,we identify a more prolonged presence of typeC quasi-periodic oscillations(QPOs)with centroid frequencies ranging from~0.16 to 6.3 Hz,which present correlations with the hardness ratio and the photon index of the Comptonized *** QPO frequencies less than~2 Hz,the QPO phase lags are hard(photons of 10–19 keV arrive later than those of 1–4 keV),while at higher frequencies,the lags become soft at and above~4 ***,the spectra in all Insight-HXMT observations consist of a multi-color blackbody component and a Comptonized component,as commonly observed in classical black hole X-ray *** analyze state transitions and the evolution of accretion geometry in this *** fitted inner disk radius increases abnormally during the low hard state,hypothesized to result from the corona condensing onto the inner ***,two significant drops in flux are observed during the soft intermediate state,maybe implying changes in the corona/jet and the disk,respectively.

关键词： X-rays:binaries accretion accretion disks stars:black holes

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Investigation on drawing process of Bi-2223/Ag wires using racetrack-type dies:Simulation and experiments

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Science China(Technological Sciences) 2009年第8期52卷 2255-2262页

作者： LU YongJin ZENG Pan LEI LiPing qu timing FANG Gang SUN JianFeng Key Laboratory for Advanced Materials Processing Technology Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Innova Superconductor Technology Co.Ltd. Beijing 100176China

The traditional rolling process of Bi-2223/Ag wires with circular sections is an inhomogeneous process. For the purpose of achieving a uniform filaments distribution, a novel technique for round wire through racetrack-type dies during the last several passes of drawing is necessarily brought forward. In order to investigate the processing behaviors of superconducting filaments, a numerical model for the three passes of racetrack drawing was constructed, and subsequently, the optimization of three racetrack-type dies was designed based on the simulation results. Then the three passes of racetrack drawing was applied to fabricate Bi-2223/Ag tape and the density distribution of each filament of the wire was studied by Vickers microhardness. The experimental results showed that the racetrack drawing can obtain dense superconducting filaments, and improve the mechanical properties and critical current of the final tape.

关键词： racetrack-type die Bi-2223/Ag modelling

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A novel aluminum-carbon nanotubes nanocomposite with doubled strength and preserved electrical conductivity

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Nano Research 2021年第8期14卷 2776-2782页

作者： Shuai Zhang Gaoqiang Chen timing.qu Jinquan Wei Yufan Yan qu Liu Mengran Zhou Gong Zhang Zhaoxia Zhou Huan Gao Dawei Yao Yuanwang Zhang Qingyu Shi Hua Zhang State Key Laboratory of Tribology Key Laboratory for Advanced Materials Processing Technology Ministry of Education of ChinaDepartment of Mechanical Engineering Tsinghua UniversityBeijing 100084China Key Lab for Advanced Materials Processing Technology of Education Ministry School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Loughborough materials characterization center Department of materialsLoughborough UniversityLoughboroughLEU 3TUUK State Key Laboratory of Special Cable Technology Shanghai Electric Cable Research Institute Co.Ltd.Shanghai 200093China School of Mechanical Engineering Beijing Institute of Petrochemical Technology Beijing 102617China

Enhancing the mechanical strength of highly conductive pure metals usually causes significant reduction in their electrical *** example,introducing phase/matrix interfaces or more grain boundaries,are common and effective methods to strengthen *** it simultaneously increases the electron scattering at the interface,thus reducing the electrical *** this study,we demonstrate that pure aluminum(Al)/carbon nanotubes(CNTs)nanocomposites prepared by friction stir processing have successfully broken through these *** yield strength and tensile strength of Al/CNTs nanocomposites have improved by 104.7%and 51.8%compared to pure Al,while the electrical conductivity remained comparable to that of pure *** explore the potential mechanisms,the interface between CNTs and Al was examined and characterized by transmission electron microscopy(TEM)and Raman *** interfacial reaction compounds were present and no visible physical gaps were observed at CNTs and Al *** defined it as a clean and tightly bonded *** the quantity of phase interface has increased,the electrical conductivity of the nanocomposite remains approximately *** attribute the preserved electrical conductivity to the clean and tightly bonded CNTs/Al interface in the nanocomposite.

关键词： carbon nanotubes/aluminum nanocomposites mechanical properties electrical conductivity friction stir processing interface

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Effect of edge cracks on critical current degradation in REBCO tapes under tensile stress

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Superconductivity 2022年第1期1卷 52-62页

作者： Zhirong Yang Yi Li Peng Song Mingzhi Guan Feng Feng timing.qu State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Department of Mechanical Engineering Advanced Manufacturing InstituteTexas Center for SuperconductivityUniversity of HoustonHoustonTX 77024USA Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Lab of Intelligent Manufacturing and Precision Machining Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

The slitting process for manufacturing REBa2Cu3O7δ(REBCO,RE=Rare earth)tapes of required width significantly improves the production efficiency and reduces production ***,edge cracks induced by the slitting process of wide REBCO tapes may cause premature degradation under high tensile stress in highfield ***,it is necessary to evaluate the effect of edge cracks of REBCO tapes on the critical current(Ic)***,Ic degradation under artificial cracks was measured to validate the applicability of linear elastic fracture mechanics for the REBCO *** maximum circumferential stress criterion was used to derive the mixed-mode stress intensity factor of multiple oblique edge cracks.A semi-analytical model considering edge crack properties such as angleβ,spacing d,and length a,was built to evaluate the critical load and critical *** found that when the stress intensity factor at the crack tip is below KIC?2:3 MPa ffiffiffiffim p,edge cracks did not *** examined commercial REBCO tapes manufactured by two different processes,concluding that edge cracks in these tapes will not cause premature degradation.

关键词： REBCO Degradation Stress intensity factor Multiple oblique edge cracks Fracture toughness

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碳移除下全球地表气温峰值出现时间的主要影响因子:能量平衡模型研究

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气候与环境研究 2024年第3期29卷 339-352页

作者：屈侠黄刚中国科学院大气物理研究所季风系统研究中心北京100029 中国科学院大气科学与地球流体国家重点实验室北京100029

碳移除是21世纪末实现巴黎气候协定温度目标的关键手段。在其开展后,全球地表气温将在随后的若干年达峰。目前,耦合模式比较计划第六阶段(CMIP6)开展碳移除试验的数值模式较少,限制了科学界对碳移除下全球地表气温峰值出现时间的理解。... 详细信息

碳移除是21世纪末实现巴黎气候协定温度目标的关键手段。在其开展后,全球地表气温将在随后的若干年达峰。目前,耦合模式比较计划第六阶段(CMIP6)开展碳移除试验的数值模式较少,限制了科学界对碳移除下全球地表气温峰值出现时间的理解。本文发现,基于强迫—响应能量框架的两层能量平衡模型能够很好地重现出:1)大气CO_(2)浓度变化对全球地表气温的影响;2)碳移除过程中全球地表气温的峰值出现时间。因此,该模型可作为CMIP6碳移除试验的补充,能够胜任峰值出现时间的影响因子研究。该能量平衡模型的结果显示,在碳移除过程中,不考虑深层海洋的情况下,对全球平均地表气温的峰值出现时间影响最大的因子为平衡气候敏感度,其次为地表热容量;当深层海洋存在时,影响最大的因子为深层海洋热容量,其次为平衡气候敏感度,之后为地表热容量。这些因子主要通过改变碳移除开始时地表净能量收入的大小来影响全球地表气温峰值的出现时间。相比不考虑深层海洋的情况,深层海洋的存在可以略微提前全球温度峰值出现的时间,并使得碳移除后CO_(2)强迫对地表净能量的下降幅度的贡献较大。

关键词：碳移除温度峰值出现时间影响因子

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《脾胃论》服药法度探析

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中华中医药杂志 2024年第3期39卷 1460-1463页

作者：曲永龙任亮张玉苹北京中医药大学北京102488

《脾胃论》是金元时期著名医家李东垣的代表性著作,该书的著成标志着中医脾胃学说正式提出,对于中医理论和临床的发展具有重要的意义,是一个本里程碑式的著作。《脾胃论》一书着重的地方就在于如何调治脾胃,并从脾胃论治全身的疾病。李... 详细信息

《脾胃论》是金元时期著名医家李东垣的代表性著作,该书的著成标志着中医脾胃学说正式提出,对于中医理论和临床的发展具有重要的意义,是一个本里程碑式的著作。《脾胃论》一书着重的地方就在于如何调治脾胃,并从脾胃论治全身的疾病。李东垣在书中着笔极为细腻,其中尤为具有代表性的便是关于方药的服用法度,李东垣重视服药时药物的温度来顺应气机升降浮沉,重视服药的时间以借助天时的力量,重视将息、言语、劳逸以及神思对于疾病康复的影响,重视服药后的饮食禁忌而顾护脾胃功能,重视服药的剂量变化和时机适应治疗的阶段性需要等,而随着现代中医临床的发展,我们在临床上已经逐渐淡化了这些法度,有必要加以挖掘从而进一步提高临床疗效。

关键词：李东垣《脾胃论》服药法服药温度服药时间服药将息法服药剂量服药饮食宜忌

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徽州节气民俗的当代传承与保护

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淮南师范学院学报 2024年第4期26卷 98-101页

作者：曲晓红安徽师范大学历史学院安徽芜湖241002 黄山学院文学院安徽黄山245041

社会形态的变迁使得以指导农业生产为主要功能的节气逐渐淡出当代人的日常生活,部分节气民俗逐渐式微乃至消失。在现代社会,节气计时在通用历法中仍具有特殊的地位,节气因其与众不同的社会价值而被人们所遵从。古代徽州会举行各种节气... 详细信息

社会形态的变迁使得以指导农业生产为主要功能的节气逐渐淡出当代人的日常生活,部分节气民俗逐渐式微乃至消失。在现代社会,节气计时在通用历法中仍具有特殊的地位,节气因其与众不同的社会价值而被人们所遵从。古代徽州会举行各种节气民俗活动,这是自然环境和人文生活的反映。新时代民俗的传承和保护应从建立和开发民俗文化的多种样态、发挥主观能动性、将节气饮食民俗融入日常生活三个维度,让节气民俗走进现代生活。这些样态都在城市生活的方方面面中得到传承和保护,要关注民俗文化的差异性问题,打造地域文化品牌。

关键词：节气民俗徽州地域文化

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局限期小细胞肺癌的放射治疗进展

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沈阳医学院学报 2024年第4期26卷 409-415页

作者：曲皎月汪庚明蚌埠医学院第一附属医院放疗科安徽蚌埠233000

当前,同步放化疗及预防性颅脑照射是局限期小细胞肺癌的标准治疗方案。尽管其疗效明显,但仍有1/3的患者会出现局部复发。为探讨如何最大程度控制局部复发及提高生存期,本文分析了局限期小细胞肺癌放射治疗的研究现状,探索其最佳放射时... 详细信息

当前,同步放化疗及预防性颅脑照射是局限期小细胞肺癌的标准治疗方案。尽管其疗效明显,但仍有1/3的患者会出现局部复发。为探讨如何最大程度控制局部复发及提高生存期,本文分析了局限期小细胞肺癌放射治疗的研究现状,探索其最佳放射时机、靶区、剂量、分割方式,及预防性颅脑照射。此外,还对局限期小细胞肺癌新兴的放射治疗联合免疫治疗进行了概述。

关键词：小细胞肺癌局限期放射治疗免疫治疗

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