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Formation of intermetallic phases in unrefined and refined AA6082 Al alloys investigated by using SEM-based ultramicrotomy tomography

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journal of Materials Science & Technology 2022年第25期120卷 118-128页

作者： j.M.yu T.Hashimoto H.T.Li N.Wanderka Z.Zhang C.Cai x.L.Zhong j.Qin Q.P.Dong H.Nagaumi x.N.Wang Shagang School of Iron and Steel and High-Performance Metal Structural Materials Research Institute Soochow UniversitySuzhou 215137China School of Materials The University of ManchesterSackville StreetManchester M139PLUK Chinalco Materials Application Research Institute Co.Ltd. Beijing 102200China Helmholtz-Zentrum Berlin Für Materialien und Energie Hahn-Meitner-Platz 1Berlin 14109Germany Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The spatial arrangement,distribution and morphology of Fe-bearing intermetallics in AA6082 alloys depends on the manufacturing process of the alloy and thus influences the macroscopic ***,the microstructure of a near industrial scale casting AA6082 Al alloy fabricated by:(a)direct chill casting,(b)Al-5 Ti-1 B grain refiner addition and(c)intensive melt shearing has been investigated by threedimensional visualization using SEM-based serial ultra microtomy *** formation sequence of phases in AA6082 alloys is generally categorized into four stages:formation ofα-Al grains,Fe-bearing intermetallics,Mg_(2)Si phase,and eutectic *** of three-dimensional visualization of the microstructure indicated that TiBparticles not only could nucleate Fe-bearingβ-intermetallics,but also could provide substrate for the formation of Fe-bearingα-intermetallics and Mg_(2)Si.A further deep analysis reveals that the essential condition for the formation of secondary phases such as Fe-bearing intermetallics and Mg_(2)Si phase is the build-up of a supersaturated solute front at theα-Al solid-liquid interface irrespective of the specific nucleation *** addition,the results indicate that grain refinement processing causes the severe interconnectivity of Fe-bearingα-***,the intensive melt shearing is a better manufacturing process because the intermetallics are more evenly distributed and refined than with the addition of the grain refiner,thereby improving the properties of the alloy.

关键词： Al-Si-Mg alloy Grain refinement Al-Fe-Si intermetallic phase Tomography Ultramicrotomy Mg2Si

Early Paleozoic granulite-facies metamorphism and anatexis in the northern West Qinling orogen： Monazite and zircon U-Pb geochronological constraints

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Science China Earth Sciences 2017年第5期60卷 943-957页

作者： MAO xiaoHong ZHANG jianxin yu ShengYao LI yunShuai yu xingxing LU ZengLong Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China School of Earth and Space Sciences Peking UniversityBeijing 100871China Submarine Geosciences and Prospecting Techniques MOE and College of Marine GeosciencesOcean University of ChinaQingdao 266100China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266235China Institute of Surface-Earth System Science Tianjin UniversityTianjin 300072China

In the northern West Qinling orogen(WQO), granulite-facies metamorphic rocks are recognized within the Qinling Complex. These rocks are composed of amphibole-bearing two-pyroxene granulite and garnet-sillimanite gneiss with widespread migmatitization. We investigate three granulite-facies samples and one leucosome sample from the Qinling Complex, which are suitable for U-Pb analyses of zircon and monazite. SHRIMP and LA-ICPMS U-Pb age dating of zircon and monazite from two pelitic granulites provides weighted mean ages of 430±4 Ma(MSWD=0.88) and 433±4 Ma(MSWD=0.27), *** on the petrographic characteristics and zircon CL imagery, we postulated a ca. 430 Ma metamorphic timing for the pelitic granulites. LA-ICPMS zircon U-Pb data from an amphibole two-pyroxene granulite sample reports two weighted mean age groups:424±3 Ma(MSWD=0.45) and 402±3 Ma(MSWD=1.4), which were interpreted as granulite-facies metamorphic and retrograde ages, respectively. LA-ICPMS U-Pb dating of zircons from the leucosome sample yields a weighted mean age of 426±2 Ma(MSWD=0.3), which is interpreted as the crystallization age of the leucosome. These data indicate that the West QOB experienced early Paleozoic granulite-facies metamorphism and anatexis similar to the East QOB. However, it remains unclear whether the early Paleozoic granulite facies metamorphism resulted from an arc setting created by the northward subduction of the Shangdan ocean or from a continental collisional orogenic event.

关键词： West Qinling Granulite Migmatite U-Pb age dating Metamorphism Early Paleozoic

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Excellent strength-ductility combination in Co_(36)Cr_(15)Fe_(18)Ni_(18)Al_(8)Ti_(4)Mo_(1)multi-principal element alloys by dual-morphology B2 precipitates strengthening

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journal of Materials Science & Technology 2023年第3期134卷 60-66页

作者： x.S.Liu R.Li x.F.Fan Q.Q.Liu x.Tong A.x.Li S.xu H.Yang S.B.yu M.H.jiang C.Huo P.F.yu M.T.Dove G.Li State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China College of Computer Science Sichuan UniversityChengdu 610065China School of Physical and Chemical Sciences Queen Mary University of LondonMile End RoadLondon E14NSUnited Kingdom School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China

Precipitation strengthening provides one of the most widely-used mechanisms for strengthen-ing multi-principal-element alloys(MPEAs).Here,we report dual-morphology B2 precipitates in Co_(36)Cr_(15)Fe_(18)Ni_(18)Al_(8)Ti_(4)Mo_(1)MPEA obtained by thermo-mechanical *** microscopy charac-terization reveals that the dual-morphology B2 precipitates are either recrystallized B2 particles formed at the grain boundaries or triple junctions with recrystallization process,or rod-like within the non-recrystallized FCC *** dual-morphology B2 precipitates enhance the yield strength and ultimate tensile strength up to 1120 MPa and 1480 MPa,*** work suggests the mechanical proper-ties of the alloy can be optimized by B2 precipitation strengthening to meet the needs of engineering applications.

关键词： Multi-principal element alloys B2 precipitates Heterogeneous nucleation Precipitation strengthening

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习近平文化思想科学体系阐释论纲

新疆师范大学学报（哲学社会科学版） 2025年第1期46卷 16-33,F0002页

作者：范玉刚山东大学文艺美学研究中心山东济南250100 南方科技大学全球城市文明典范研究院广东深圳518055

习近平文化思想是逻辑自恰、相互贯通、结构完整并集时代性、系统性、原创性于一体的开放性科学体系。深刻把握和领会习近平文化思想的核心要义与主导逻辑,需要建构具有有效性的理论阐释框架。文本通过提炼五个重大学术命题,即坚持党对... 详细信息

习近平文化思想是逻辑自恰、相互贯通、结构完整并集时代性、系统性、原创性于一体的开放性科学体系。深刻把握和领会习近平文化思想的核心要义与主导逻辑,需要建构具有有效性的理论阐释框架。文本通过提炼五个重大学术命题,即坚持党对文化工作的全面领导和巩固党的文化领导权,坚定文化自信、建设社会主义文化强国,在不断健全文化体系中增强国家文化软实力,以“两个结合”特别是“第二个结合”引领中华文明发展,在文明互鉴中增强中华文明的传播力影响力,以此为四梁八柱构建阐释习近平文化思想科学体系的理论框架。

关键词：习近平文化思想科学体系文化基本理论重大学术命题理论框架

CONTROL OF CANCER PAIN TO ENSURE THE BEST POSSIBLE QUALITY OF LIFE

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journal of Traditional Chinese Medicine 1992年第4期12卷 243-255页

作者： G Q yu j x Liu P W Li j x Qin E x yu L M Liu L C Wu M H Shen W S Zhou M M Li Guang An Men Hospital China Academy of Traditional Chinese Medicine Beijing.

yu Guiqing 余桂清(Guang An Men Hospi-tal,China Academy of Traditional ChineseMedicine,Beijng 100053)The therapeutic strategy regarding can-cer pain is first to get rid of the causes ofpain with anticancer treatment so... 详细信息

关键词： Radix materia stasis anticancer verity herbal 田螺膏 relieve 黑龙丹大黄度虫丸

Effects of chemical pressure on diluted magneticsemiconductor(Ba,K)(Zn,Mn)_2As_2

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Chinese Physics B 2019年第5期28卷 288-292页

作者： Y Peng S yu G Q Zhao W M Li j F Zhao L P Cao x C Wang Q Q Liu S j Zhang R Z yu Z Deng x H Zhu C Q jin College of Materials Science & Engineering Sichuan University Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences Collaborative Innovation Center of Quantum Matter

Chemical pressure induced by iso-valent doping has been widely employed to tune physical properties of materials. In this work, we report effects of chemical pressure by substitution of Sb or P into As on a recently discovered diluted magnetic semiconductor(Ba,K)(Zn,Mn)_2 As_2, which has the record of reliable Curie temperature of 230 K due to independent charge and spin doping. Sb and P are substituted into As-site to produce negative and positive chemical pressures, respectively.x-ray diffraction results demonstrate the successful chemical solution of dopants. Magnetic properties of both K-underdoped and K-optimal-doped samples are effectively tuned by Sb-and P-doping. The Hall effect measurements do not show decrease in carrier concentrations upon Sb-and P-doping. Impressively, magnetoresistance is significantly improved from7% to 27% by only 10% P-doping, successfully extending potential application of(Ba,K)(Zn,Mn)_2 As_2.

关键词： chemical pressure (Ba,K)(Zn,Mn)2As2 diluted magnetic semiconductor iso-valent doping

Source-network Frequency Cooperative Control and Parameter Optimization Method for High Proportion Renewable Energy UHVDC Feeder Grid

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Dianwang jishu/Power System Technology 2025年第1期49卷 263-271页

作者： xie, Yan Tang, xiaojun Dong, yu Ma, Shiying Shen, jiakai Yan, jianfeng Haidian District Beijing 100192 China State Grid Corporation of China Xicheng District Beijing 100031 China

How to balance the frequency regulation performance and the economic cost to reduce or prevent the system’s generator-tripping and load-shedding is a crucial challenge in enhancing the reliability of high-ratio renewable energy power systems. To explore the power system source-network frequency cooperative control methods, this paper takes renewable energy generators and LCC-HVDC systems as examples, analyzes the frequency regulation principle and control strategy of the main potential resources, and constructs a multi-dimensional evaluation index system for different frequency regulation measures. Further, combining the ideas of global optimization of parameters based on typical scenarios, disturbances and secondary optimization based on actual disturbances, a source-network frequency cooperative control and parameter optimization method based on the comprehensive effectiveness assessment of frequency regulation measures is proposed. Finally, based on the 2023 data of a UHVDC feeder grid and the frequency test data of a typical renewable energy power station, the PSASP software platform is used to construct a simulation model of the region's power grid after calibration. The validation and analysis of the proposed method is carried out for the typical daytime and nighttime operation modes. The results show that the source-network frequency cooperative control and parameter optimization method based on the comprehensive effectiveness assessment of frequency regulation measures proposed in the paper can significantly improve the frequency support capability of the system while considering the economic cost. © 2025 Power System Technology Press. All rights reserved.

关键词： HVDC power transmission

Unveiling phosphofructokinase as the key target: an innovative strategy combining pull-down assays with optical imaging for snail-killing mechanism exploration

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Science China Chemistry 2025年

作者： yuxun Lu Weisi Wang Le yu yuqiang Zhao Ying Chen yunhai Guo Bingrong Luo yuhua Liu Shizhu Li Liping Duan Ying Zhou yunnan Characteristic Plant Extraction Laboratory College of Chemical Science and Technology Yunnan University College of Biological and Chemical Engineering Guangxi University of Science and Technology National Institute of Parasitic Diseases Chinese Center for Disease Control and Prevention (Chinese Center for Tropical Diseases Research)NHC Key Laboratory of Parasite and Vector Biology WHO Collaborating Centre for Tropical Diseases National Center for International Research on Tropical Diseases School of Chemistry and Environment Yunnan Minzu University Dali Institute of Schistosomiasis Control

The Pomacea canaliculata, also known as apple snail, is an invasive species in China, posing a serious threat to agricultural production and public health. To prevent its rampant infestation, we developed a highly efficient snail-killing lead compound, 1-(4-chlorophenyl)-3-(pyridin-3-yl)urea (PBQ). However, the killing mechanism of PBQ remains unclear. To elucidate this, two novel compounds, B-PBQ and j-PBQ, were developed through structural modification of PBQ and were used, through both protein pull-down assay and confocal laser scanning microscopy imaging, to identify and confirm that phosphofructokinase(PFK) in the apple snail is the primary target protein of PBQ. Further studies revealed that PBQ successfully inhibits the activity,content, and expression of PFK in apple snail, disrupting the glycolysis pathway and leading to abnormal energy *** disruptions impair the snail’s tolerance to low oxygen, resulting in its efficient eradication. These findings offer a promising direction for developing next-generation PFK-targeted snail-killing pesticides. Furthermore, the strategy of combining pull-down assays with optical imaging used in this work provides a novel approach for the exploration of mechanisms of other pesticide candidates.

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纽约大学库朗数学科学研究所交叉科研组织模式发展路径分析

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黑龙江高教研究 2025年第1期43卷 72-79页

作者：于依琼聂映玉陈青上海交通大学上海200240 华东师范大学上海200062

有效组织交叉科学研究面临诸多挑战。纽约大学库朗数学科学研究所通过从平衡数学学科内部分支到构建跨学科知识体系、从研究单一问题到满足国家与社会需求、从促进合作交流到建立学科集群等措施,成功构建了组织交叉科学研究的发展路径... 详细信息

有效组织交叉科学研究面临诸多挑战。纽约大学库朗数学科学研究所通过从平衡数学学科内部分支到构建跨学科知识体系、从研究单一问题到满足国家与社会需求、从促进合作交流到建立学科集群等措施,成功构建了组织交叉科学研究的发展路径。其关键因素在于传承交叉科研核心价值观、孵化多元化交叉平台、实施自主灵活用人机制和精准定位目标人才培养模式等。研究发现,其交叉科研组织模式展现了与超学科理论核心原则高度一致的生长逻辑。借鉴超学科理论,提出交又科研核心价值观的树立传承、基础学科与优势学科多维融合、研究成果的社会应用与转化等策略建议,旨在为我国高校和科研机构在组织交叉科学研究时提供理论指导和实践参考。

关键词：交叉科学研究组织模式基础学科超学科纽约大学库朗数学科学研究所