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Improving Intergranular Stress Corrosion Cracking Resistance in a Fe–18Cr–17Mn–2Mo–0.85N Austenitic Stainless Steel Through Grain Boundary Character Distribution Optimization

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Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1849-1861页

作者： F.shi L.Yan J.Hu L.F.wang T.z.Li w.Li X.J.Guan C.M.Liu X.w.Li Department of Materials Physics and Chemistry School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China

The grain boundary character distribution(GBCD) optimization and its effect on the intergranular stress corrosion cracking(IGSCC) resistance in a cold-rolled and subsequently annealed Fe-18 Cr-17 Mn-2 Mo-0.85 N high-nitrogen nickel-free austenitic stainless steel were systematically *** results show that stacking faults and planar slip bands appearing at the right amount of deformation(lower than 10%) are beneficial cold-rolled microstructures to the GBCD *** proportion of special boundaries gradually increases in the subsequent stages of recrystallization and grain growth,accompanying with the growth of twin-related domain in the experimental *** this way,the fraction of low ∑ coincidence site lattice(CSL) boundaries can reach as high as 82.85% for the specimen cold-rolled by 5% and then annealed at 1423 K for 72 *** GBCD optimization,low ∑ CSL boundaries and the special triple junctions(J2,J3) of high proportion can greatly hinder the nitride precipitation along grain boundaries and enhance the capability for intergranular crack arrest,thus improving the IGSCC resistance of the experimental steel.

关键词： High-nitrogen austenitic stainless steel Grain boundary character distribution Coincidence site lattice(CSL)grain boundary Electron backscatter diff raction(EBSD) Intergranular stress corrosion cracking

Ground-state mass of ^(22)Al and test of state-of-the-art ab initio calculations

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Chinese Physics C 2024年第3期48卷 72-78页

作者：孙铭泽于越王新鹏王猛李健国张玉虎 K.Blaum 陈祖毅陈瑞九邓涵宇付超义葛文文黄文嘉焦红扬李红蕙李宏福罗胤芳廖挺 YuALitvinov 司敏帅鹏史金阳王茜邢元明徐星徐瑚珊许甫荣袁琪 T.Yamaguchi 颜鑫亮杨建成原有进周小红周旭张敏曾奇 CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Max-Planck-Institut für Kernphysik Saupfercheckweg 169117 HeidelbergGermany GSI Helmholtzzentrum für Schwerionenforschung Planckstraße 164291 DarmstadtGermany Advanced Energy Science and Technology Guangdong Laboratory Huizhou516007China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Department of Physics Saitama UniversitySaitama 338-8570Japan School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China

The ground-state mass excess of the T_(z)=−2 drip-line nucleus ^(22)Al is measured for the first time as 18103(10)keV using the newly-developed Bρ-defined isochronous mass spectrometry method at the cooler storage ring in *** new mass excess value allowed us to determine the excitation energies of the two low-lying 1+states in ^(22)Al with significantly reduced uncertainties of 51 *** compared to the analogue states in its mirror nucleus ^(22)F,the mirror energy differences of the two 1^(+)states in the ^(22)Al-^(22)F mirror pair are determined to be−625(51)keV and−330(51)*** excitation energies and mirror energy differences are used to test the state-of-the-art ab initio valence-space in-medium similarity renormalization group calculations with four sets of interactions derived from the chiral effective field *** mechanism leading to the large mirror energy differences is investigated and attributed to the occupation of theπs_(1/2) orbital.

关键词： nuclear mass Bρ-defined IMS mirror energy difference ab initio VS-IMSRG calculations chiral interactions

^(252)Cf自发裂变K X射线发射与动能-电荷关系

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物理学报 2024年第14期73卷 43-50页

作者：刘超刘世龙杨毅冯晶李昱兆中国原子能科学研究院核数据重点实验室北京102413

原子核裂变后多物理量间的关联测量是认识裂变过程直接有效的实验手段,然而由于初级裂变产物准确的电荷鉴别仍面临技术困难,电荷相关的多参数研究相对匮乏.为此,通过高分辨的低能高纯锗探测器和金硅面垒探测器开展了^(252)Cf自发裂变的... 详细信息

原子核裂变后多物理量间的关联测量是认识裂变过程直接有效的实验手段,然而由于初级裂变产物准确的电荷鉴别仍面临技术困难,电荷相关的多参数研究相对匮乏.为此,通过高分辨的低能高纯锗探测器和金硅面垒探测器开展了^(252)Cf自发裂变的裂变碎片K X射线和动能的符合测量.利用K X射线可以很好地鉴别电荷数z=39—62的裂变碎片,电荷分辨Δz≈0.7,K X射线产额呈现强烈的电荷相关性.借助K X射线给出了碎片平均动能和平均总动能及其分布宽度随核电荷数的分布,轻碎片动能分布具有鲜明的奇偶效应,偶z碎片的动能比奇z碎片的高约0.48 MeV;平均总动能在z=52—53处达到峰值,总动能分布宽度在z=56附近呈现凹坑,这反映了形变壳结构对断点形状的显著影响.裂变碎片K X射线发射的信息及动能-电荷关系研究可为裂变独立产额测量和裂变理论模型的检验提供必要的参考数据.

关键词：裂变碎片 K X 射线电荷鉴别碎片动能

RESEARCH ON LASER DIRECT DEPOSITION PROCESS OF Ti-6Al-4V ALLOY

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Acta Metallurgica Sinica(English Letters) 2007年第3期20卷 171-180页

作者： S.Y. Gao Y.z. zhang L.K. shi B.L. Du M.z. Xi H.z. Ji Mechanical Engineering College Yanshan University O~mhuangdao 066004 China Beijing General Research Institute for Nonferrous Metals Beijing 100088 China

Laser direct deposition （LDD） of metallic components is an advanced technology of combining CAD/CAM （computer aided design/computer aided manufacturing）, high power laser, and rapid prototyping. This technology uses laser beam to melt the powders fed coaxiaUy into the molten pool by the laser beam to fabricate fuUy dense metallic components. The present article mainly studies the LDD of Ti-6Al-4V alloy, which can be used to fabricate aircraft components. The mechanical properties of the Ti-6Al-4V alloy, fabricated by LDD, are obtained using the tension test, and the oxygen content of used powders and deposited specimens are measured. In the present article, it can be seen that the mechanical properties obtained using this method are higher than the ones obtained by casting, and equal to those got by wrought anneal. One aircraft part has been made using the LDD process. Because of this aircraft part, with sophisticated shape, the effect of the laser scanning track on the internal soundness of the deposited part was discussed.

关键词： laser direct deposition Ti-6Al-4V alloy mechanical property depositing process aircraft component

一种增强负泊松比结构的压电俘能器的设计与分析

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振动工程学报 2024年第7期37卷 1182-1190页

作者：陆亚平时岩李文彬高强南京理工大学机械工程学院江苏南京210094 东南大学机械工程学院江苏南京211189

考虑到传统压电悬臂梁存在固有频率高,输出性能低的缺点,本文基于增强负泊松比结构设计了一种压电俘能器,在弹性基板中引入了负泊松比结构和X型肋骨。利用有限元方法建立了压电俘能器的动力学模型;通过数值方法进行了模态和压电耦合分析... 详细信息

考虑到传统压电悬臂梁存在固有频率高,输出性能低的缺点,本文基于增强负泊松比结构设计了一种压电俘能器,在弹性基板中引入了负泊松比结构和X型肋骨。利用有限元方法建立了压电俘能器的动力学模型;通过数值方法进行了模态和压电耦合分析,并对增强负泊松比结构的俘能器进行了参数分析;搭建了实验平台,制作了压电俘能器样品,对输出性能进行验证。研究结果表明:与传统平板结构俘能器相比,增强负泊松比结构俘能器的一阶谐振频率低,输出电压和功率高,X型肋骨的加入提高了结构的刚度和非线性;相比于负泊松比结构的俘能器,X型肋骨的加入不仅改善了结构的疲劳性能,还拓宽了工作带宽。

关键词：压电俘能器负泊松比结构性能分析

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Follicle stimulating hormone controls granulosa cell glutamine synthesis to regulate ovulation

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Protein & Cell 2024年第7期15卷 512-529页

作者： Kai-Hui zhang Fei-Fei zhang zhi-Ling zhang Ke-Fei Fang wen-Xing Sun Na Kong Min wu Hai-Ou Liu Yan Liu zhi Li Qing-Qing Cai Yang wang Quan-wei wei Peng-Cheng Lin Yan Lin wei Xu Cong-Jian Xu Yi-Yuan Yuan shi-Min zhao The Obstetrics&Gynecology Hospital of Fudan University State Key Laboratory of Genetic EngineeringFudan UniversityShanghai 200090China Shanghai Key Laboratory of Metabolic Remodeling and Children’s Hospital of Fudan UniversityShanghai 200032China School of Life Sciences and Institutes of Biomedical Sciences Fudan UniversityShanghai 200438China Department of Nutrition and Food Hygiene School of Public HealthNantong UniversityNantong 226019China Reproductive Medicine Center The Affiliated Drum Tower Hospital of Nanjing University Medical SchoolNanjing 210008China Shanghai Fifth People’s Hospital of Fudan University Fudan UniversityShanghai 200240China Department of Animal Science and Technology Nanjing Agricultural UniversityNanjing 210014China Key Laboratory for Tibet Plateau Phytochemistry of Qinghai Province College of PharmacyQinghai University for NationalitiesXining 810007China Pediatric Research Institute Children’s Hospital Affiliated to Shandong University(Jinan Children’s Hospital)Jinan 250022China

Polycystic ovary syndrome(PCOS)is the leading cause of anovulatory *** understanding of the ovulation drivers hinders PCOS ***,we report that follicle stimulating hormone(FSH)controls follicular fluid(FF)glutamine levels to determine *** ovulation starts from FF-exposing granulosa cell(GC)*** glutamine,which decreases in pre-ovulation porcine FF,elevates in PCOS patients ***-glutamine chow to elevate FF glutamine inhibits mouse GC apoptosis and induces hormonal,metabolic,and morphologic PCOS ***,follicle-development-driving FSH promotes GC glutamine synthesis to elevate FF glutamine,which maintain follicle wall integrity by inhibiting GC apoptosis through inactivating ASK1-JNK apoptotic *** and glutamine inhibit the rapture of cultured murine *** removal or ASK1-JNK pathway activation with metformin or AT-101 reversed PCOS traits in PCOS models that are induced with either glutamine or *** suggest that glutamine,FSH,and ASK1-JNK pathway are targetable to alleviate PCOS.

关键词： ovulation glutamine granulosa cells PCOS FSH

科学话语何以主导文化体系——福柯“知识-权力”结构的理论效应

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自然辩证法通讯 2024年第8期46卷 102-109页

作者：施冠男刘同舫浙江工业大学马克思主义学院浙江杭州310014 浙江大学马克思主义学院浙江杭州310058

福柯通过对“知识-权力”双向互动关系的深刻阐释,展开了对科学话语生成过程及其现实效用的哲学反思。在福柯看来,现实社会中的科学话语与权力是一种共生的关系。科学话语在权力的加持下逐渐攀附至文化体系的巅峰,其权威身份和主导地位... 详细信息

福柯通过对“知识-权力”双向互动关系的深刻阐释,展开了对科学话语生成过程及其现实效用的哲学反思。在福柯看来,现实社会中的科学话语与权力是一种共生的关系。科学话语在权力的加持下逐渐攀附至文化体系的巅峰,其权威身份和主导地位回落于具体的社会实践领域便自然成为巩固权力的最佳助手。科学话语在与权力的合谋中完成了对社会的治理,进而衍生出对文化的掌控力量。因而,福柯指出科学话语所蕴含的权力机制正是科学话语能够主导文化体系的关键因素。福柯的这一思路对消解科学话语的权力属性,澄清科学话语的真实地位以及塑造平等开放的文化体系具有重要的理论启示。

关键词：福柯科学话语文化知识-权力

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吻合血管游离腓骨移植治疗股骨头坏死

中国组织工程研究 2024年第21期28卷 3373-3379页

作者：黄捷施扬华谭桢薄占东广西医科大学第二附属医院骨关节外科运动医学科广西壮族自治区南宁市530007 广西医科大学第一附属医院骨关节外科广西壮族自治区南宁市530021 广西医科大学第十附属医院关节与运动医学外科广西壮族自治区钦州市535099

背景:吻合血管游离腓骨移植是治疗股骨头坏死常用的有效保髋治疗手段,但其影响因素仍存在争议。目的:探究吻合血管游离腓骨移植治疗股骨头坏死的临床疗效,及股骨头坏死的病因分类和病变严重程度对其疗效的影响。方法:采集吻合血管游离... 详细信息

背景:吻合血管游离腓骨移植是治疗股骨头坏死常用的有效保髋治疗手段,但其影响因素仍存在争议。目的:探究吻合血管游离腓骨移植治疗股骨头坏死的临床疗效,及股骨头坏死的病因分类和病变严重程度对其疗效的影响。方法:采集吻合血管游离腓骨移植治疗股骨头坏死患者63例(共73髋)的临床资料及术前、术后髋关节的临床疗效评分。按股骨头坏死的病因分类标准分为激素性、酒精性和特发性3组,参照Ficat分期标准分为FicatⅡ期、FicatⅢ期和FicatⅣ期3组,分析病因分类和病变程度对吻合血管游离腓骨移植治疗股骨头坏死临床疗效的影响。结果与结论:①吻合血管游离腓骨移植治疗股骨头坏死术后各阶段的目测类比评分均较术前明显降低(P0.05);④结果提示,吻合血管游离腓骨移植治疗股骨头坏死临床疗效显著,可以减轻患者髋部疼痛和改善髋关节功能;其疗效可能不受病因的影响,而受病变严重程度的影响。

关键词：股骨头坏死保髋治疗游离腓骨移植病因分类 Ficat分期临床疗效力学特性生物学特性

Exploring the uncertainties in theoretical predictions of nuclear β-decay half-lives

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Chinese Physics C 2021年第4期45卷 273-278页

作者： M.shi J.Y.Fang z.M.Niu School of Mathematics and Physics Anhui Jianzhu UniversityHefei 230601China Key Laboratory of Architectural Acoustic Environment of Anhui Higher Education Institutes Hefei 230601China Key Laboratory of Advanced Electronic Materials and Devices Anhui Jianzhu UniversityHefei230601China School of Physics and Materials Science Anhui UniversityHefei 230601China Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China

Nuclear β-decay half-lives are predicted based on an empirical formula and the mass predictions from various nuclear *** is found that the empirical formula can reproduce the nuclearβ-decay half-lives well,especially for short-lived nuclei with T_(1/2)with N=126 are about one order of magnitude,which are much larger than the uncertainties for those with N=50 and ***,theoretical uncertainties from the parameters of the empirical formula are relatively small for the nuclei on the r-process path,which indicates that the empirical formula is very suitable for predicting theβ-decay half-lives in r-process simulations.

关键词： βdecay nuclear mass r process