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Accelerated precipitation behavior of cast Mg-Al-Zn alloy by grain refinement

Journal of Materials Science & Technology 2018年第2期34卷 265-276页

作者： sang-Hoon Kim Jong Un Lee ye Jin Kim Jun Ho Bae Bong Sun You Sung Hyuk Park School of Materials Science and Engineering Kyungpook National University Implementation Research Division Korea Institute of Materials Science

This study demonstrates that the precipitation behavior of 13-Mg17Al12 phase during aging and the resultant variation in hardness and mechanical properties of cast Mg-Al-Zn alloy are strongly dependent on initial grain size. Grain size reduction accelerates discontinuous precipitation at the early stage of aging treatment by increasing the area fraction of grain boundaries that can act as nucleation sites for discontinuous precipitates （DP）, but it does not influence DP growth rate. Grain refinement also prematurely terminates continuous precipitation because the formation of a large number of DP reduces the amount of AI dissolved in the matrix, which is required for the formation of continuous precipitates （CP）. This promotion of DP formation and early termination of CP formation significantly decrease the peak-aging time to one-third. The enhanced precipitation behavior also leads to an additional hardness improvement in the aged alloy, along with an increase in hardness owing to grain boundary strengthening by grain refinement. The amount of increase in hardness changes with aging time, which is determined by the variation of three variables with aging time： DP fraction difference between refined and nonrefined alloys, hardness difference between DP and matrix, and matrix hardness difference between the two alloys. Grain refinement improves both tensile strength and ductility of the homogenized alloy owing to grain boundary strengthening and suppression of twinning activation, respectively. However, the loss of ductility after peak-aging treatment is greater in the refined alloy because of the larger amount of DP acting as a crack source in this alloy.

关键词： Magnesium Grain refinement Aging Precipitation Tensile properties

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Length of negative resection margin does not affect local recurrence and survival in the patients with gastric cancer

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World Journal of Gastroenterology 2014年第30期20卷 10518-10524页

作者： Chang Min Lee ye Seob Jee Ju-Hee Lee sang-Yong Son sang-Hoon Ahn Do Joong Park Hyung-Ho Kim Department of Surgery Seoul National University Bundang HospitalSeongnam 463-707South Korea Department of Surgery Dankook University HospitalCheonan 330-715South Korea Colledge of Medicine Dankook UniversityCheonan 330-715South Korea Department of Surgery Hanyang University Medical CenterSeoul 133-792South Korea Colledge of Medicine Seoul National UniversitySeoul 110-799South Korea

AIM: To investigate the influence of the resection margin on local recurrence and survival in gastric cancer patients.

关键词： Gastric cancer Survival Recurrence Resection Margin

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Preparation and biodistribution of ^(99)Tc^m-PIDP as bone imaging agent

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Nuclear Science and Techniques 2009年第5期20卷 302-306页

作者： CHEN Chuanqing LUO Shineng LIN Jianguo YANG Min ye Wanzhong QIU Ling sang Guangming XIA Yongmei Key Laboratory of Nuclear Medicine Ministry of Health Jiangsu Key Laboratory of Molecular Nuclear MedicineJiangsu Institute of Nuclear Medicine Wuxi 214063 China School of Chemical and Materials Engineering Jiangnan University Wuxi 214122 China

A novel zoledronic acid derivative,1-hydroxy-2-(2-propyl-1H-imidazol-1-yl)ethane-1,1-diyldiphosphonic acid (PIDP), was synthesized by three-step reactions from 2-propyl-1H-imidazole. It was labeled with 99Tcm in conditions of 0.1 mg SnCl2.2H2O at pH 6.0 and 99TcmO4? in aqueous solution for 20 min at room temperature. The labeling yield and radiochemical purity of 99Tcm-PIDP are both higher than 95%. The biodistribution results show that the bone uptake is up to 8.47% ID/g which is the maximum of bone uptake at 30 min after injection of 99Tcm-PIDP in mice. The pharmacokinetic parameters can be estimated from the exponential equation of C=59.565e-11.307t+2.069e-1.211t. The clear bone image of rabbit was obtained at 120 min after injection of 99Tcm-PIDP. The results indicate that 99Tcm-PIDP has highly selective uptake in the skeletal and low uptake, rapid clearance in soft tissues, so it would be a potential novel bone imaging agent.

关键词： ^99Tc^m-PIDP 编译法自动控制核技术

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Extract from Zanthoxylum piperitum Induces Apoptosis of AGS Gastric Cancer Cells through Akt/MDM2/p53 Signaling Pathway

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Chinese Journal of Integrative Medicine 2021年第10期27卷 752-759页

作者： ye Seul Park Gun He Nam Kyung Jo Jo Hye Won Kawk sang Yung Kim Young Min Kim Department of Biological science and Biotechnology College of Life science and Nano TechnologyHannam University1646 Yuseong-daeroYuseong-guDaejeon 34054South Korea Department of Food Science&Bio Technology Shinansan UniversityDeahakro Danwon-guAnsan-CityGyenggi-doKorea

Objective:To determine the effect of Zanthoxylum piperitum extracet(ZPE)on apoptosis and analyze anticancer substances in ZPE,changes in proteins related to apoptosis,and pathological changes in tumors in ***:Fifteen 4-week-old female BALB/c nu/nu mice were divided into 3 groups depending on ZPE dose,with 5 in each *** gastric carcinoma cells(1 x 10^(6) cells/200 jxL)were subcutaneously injected into the flank of each *** week after the injection of AGS cells,ZPE was administered to the skin tissue[10 or 50 mg/(kg-d)]in the low-and high-dose groups,respectively for 20 *** animals were injected with vehicle *** 3 weeks,the tumor was extracted and carried out for immunohistochemistry,the tendency of apoptosis and p53 in the body was checked using TdT-mediated dUTP nick-end labeling(TUNEL)*** 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)assay,annexin V dead cell staining,cell cycle arrest and Western blotting,AGS gastric carcinoma cells were incubated with various concentrations of ZPE for 24 *** survival rates were analyzed by MTT *** was analyzed using annexin V dead cell staining and cell cycle arrest and measured using Muse cell ***:High performance liquid chromatography(HPLC)analysis showed that ZPE contained organic sulfur compounds such as alliin and *** assay results revealed that ZPE(10-85»xg/mL)could effectively inhibit the growth of AGS gastric cancer cells at higher concentrations(P<0.05,P<0.01).The annexin V&dead cell staining assay and cell cycle arrest assay confirmed a dose-dependent increase in the apoptosis rate and G!phase in ZPE(10-70 jig/mL)*** decreased the expression of anti-apoptotic proteins(p-Akt,p-MDM2,Bcl-2),while increased pro-apoptotic proteins(cleaved PARP,p53,pro-Caspase 3,Bax).TUNEL assays revealed an increase in cell *** staining confirmed the involvement of ***:ZPE decreases AGS cell

关键词： AGS gastric cancer cells Zanthoxylum piperitum apoptosis Akt/MDM2/p53 signaling pathway active compounds

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Recent research progress on magnesium alloys in Korea:A review

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Journal of Magnesium and Alloys 2023年第10期11卷 3545-3584页

作者： Sung Hyuk Park ye Jin Kim Hyun Ji Kim sang-Cheol Jin Jong Un Lee Alexander Komissarov Kwang Seon Shin School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Laboratory of Hybrid Nanostructured Materials National University of Science and TechnologyMoscow 119049Russia Laboratory of Medical Bioresorption and Bioresistance Moscow State University of Medicine and DentistryMoscow 127473Russia Magnesium Technology Innovation Center School of Materials Science and EngineeringSeoul National UniversitySeoul 08826Republic of Korea

This review highlights the recent advancements in Mg research in South Korea with a prime focus on high-speed-extrudable Mg–Bi-based alloys for high productivity and strength,innovative techniques utilizing{10–12}twinning for improved mechanical properties,and alloying and processing methods for enhanced corrosion ***-alloyed Mg–Bi-based alloys possess thermally stableα-Mg matrix and secondary phase,which ensures high-speed extrusion of these alloys at elevated temperatures without hot ***,they exhibit outstanding extrudability with a maximum extrusion speed of up to 70 m/***,their high alloying contents offer excellent strength even after high-speed extrusion through strong solid solution hardening and particle hardening effects,making them suitable for high-performance extruded Mg *** pre-twinning process utilizing{10–12}twinning and the combined process of pre-twinning and subsequent annealing have shown promise in controlling microstructure and texture of wrought Mg alloys and thus enhancing their mechanical *** pre-twinning process enhances tensile strength,fatigue properties,and age-hardening rate of Mg ***,the combined processes of pre-twinning and subsequent annealing considerably improve their ductility,stretch formability,bending formability,and damping *** have been made to improve the corrosion resistance of Mg alloys through alloying additions,process treatments,and surface *** elements like Ca,Sc,and Sm alter the microstructural features(such as secondary phases and grain size)that affect the corrosion *** treatments such as multidirectional forging,screw rolling,and pulse electron beam can also improve the corrosion resistance by refining the ***,advanced surface coating technologies can create durable and corrosion-resistant layers for effectively protecting the Mg *** these research activities conducted

关键词： South Korea Mg–Bi alloys {10–12}twinning Corrosion Mechanical properties

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Sulfolane‑Based Flame‑Retardant Electrolyte for High‑Voltage Sodium‑Ion Batteries

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Nano-Micro Letters 2025年第2期17卷 498-516页

作者： Xuanlong He Jie Peng Qingyun Lin Meng Li Weibin Chen Pei Liu Tao Huang Zhencheng Huang Yuying Liu Jiaojiao Deng Shenghua ye Xuming Yang Xiangzhong Ren Xiaoping Ouyang Jianhong Liu Biwei Xiao Jiangtao Hu Qianling Zhang Graphene Composite Research Center College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060People’s Republic of China Center of Electron Microscopy State Key Laboratory of Silicon and Advanced Semiconductor MaterialsSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China GRINM(Guangdong)Research Institute for Advanced Materials and Technology FoshanGuangdong 528051People’s Republic of China College of Energy Engineering Zhejiang UniversityHangzhouZhejiang 310027People’s Republic of China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105People’s Republic of China Shenzhen Eigen-Equation Graphene Technology Co.Ltd Shenzhen 518000People’s Republic of China

Sodium-ion batteries hold great promise as next-generation energy storage ***,the high instability of the electrode/electrolyte interphase during cycling has seriously hindered the development of *** particular,an unstable cathode–electrolyte interphase(CEI)leads to successive electrolyte side reactions,transition metal leaching and rapid capacity decay,which tends to be exacerbated under high-voltage ***,constructing dense and stable CEIs are crucial for high-performance *** work reports localized high-concentration electrolyte by incorporating a highly oxidation-resistant sulfolane solvent with non-solvent diluent 1H,1H,5H-octafluoropentyl-1,1,2,2-tetrafluoroethyl ether,which exhibited excellent oxidative stability and was able to form thin,dense and homogeneous *** excellent CEI enabled the O3-type layered oxide cathode NaNi_(1/3)Mn_(1/3)Fe_(1/3)O_(2)(NaNMF)to achieve stable cycling,with a capacity retention of 79.48%after 300 cycles at 1 C and 81.15%after 400 cycles at 2 C with a high charging voltage of 4.2 *** addition,its nonflammable nature enhances the safety of *** work provides a viable pathway for the application of sulfolane-based electrolytes on SIBs and the design of next-generation high-voltage electrolytes.

关键词： Sodium-ion batteries Sulfolane-based electrolyte High voltage Layered oxide cathode Flame retardant

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加强型Q460C方钢管间隙N型节点承载力研究

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哈尔滨工业大学学报 2025年第1期57卷 149-160页

作者：叶岳松赵东平王万祯肖林峰宁波大学土木工程与地理环境学院浙江宁波315211 中建丝路(陕西)建设发展有限公司西安710076 宁波市能源地下重点实验室浙江宁波315211 宁波市房屋建筑设计研究院有限公司浙江宁波315042

为考察加强构造对N型节点失效机理和承载力的影响规律,对加强节点和基本节点进行了主管轴压静力加载试验,试验结果表明:基本节点的破坏模式为主管上翼缘受拉鼓曲开裂,加强节点破坏模式为加劲板屈曲和覆板焊缝受拉开裂;加强节点的承载力... 详细信息

为考察加强构造对N型节点失效机理和承载力的影响规律,对加强节点和基本节点进行了主管轴压静力加载试验,试验结果表明:基本节点的破坏模式为主管上翼缘受拉鼓曲开裂,加强节点破坏模式为加劲板屈曲和覆板焊缝受拉开裂;加强节点的承载力较基本节点提高了9.4%~36.5%;增加覆板厚度,可明显提高节点承载力。采用ABAQUS软件对覆板和加劲板加强的Q460C方钢管间隙N型节点进行了有限元参数研究,考察了主管宽厚比γ、主支管厚度比η、主支管宽度比β、受拉支管与主管夹角θ、支管间距与主管宽度比ξ对节点破坏模式、应力分布、主管荷载-位移曲线和覆板焊缝断裂指数I f的影响规律。根据试验和数值模拟结果,提出了覆板和加劲板加强的Q460C方钢管间隙N型节点承载力计算式和构造设计建议。

关键词： Q460C方钢管 N型节点有限元模拟承载力计算式

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The seismicity in the middle section of the Altyn Tagh Fault system revealed by a dense nodal seismic array

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Earthquake Research Advances 2024年第3期4卷 7-15页

作者： Shi Yao Tao Xu Yingquan sang Lingling ye Tingwei Yang Chenglong Wu Minghui Zhang Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen518055China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing100029China University of Chinese Academy of Sciences Beijing100049China School of Information Engineering Shandong University of AeronauticsBinzhou256603China

The left-lateral Altyn Tagh Fault(ATF) system is the northern boundary of the Qinghai-Xizang Plateau, separating the Tarim Basin and the Qaidam Basin. The middle section of ATF has not recorded any large earthquakes since1598 AD, so the potential seismic hazard is unclear. We develope an earthquake catalog using continuous waveform data recorded by the Tarim-Altyn-Qaidam dense nodal seismic array from September 17 to November23, 2021 in the middle section of ATF. With the machine learning-based picker, phase association, location, match and locate workflow, we detecte 233 earthquakes with M_L-1–3, far more than 6 earthquakes in the routine catalog. Combining with focal mechanism solutions and the local fault structure, we find that seismic events are clustered along the ATF with strike-slip focal mechanisms and on the southern secondary faults with thrusting focal mechanisms. This overall seismic activity in the middle section of the ATF might be due to the northeastward transpressional motion of the Qinghai-Xizang Plateau block at the western margin of the Qaidam Basin.

关键词： Altyn Tagh Fault Machine learning Seismicity Dense seismic array

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物探技术在特长隧道工程勘察中的应用

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山西建筑 2025年第2期51卷 179-182页

作者：叶建超成都华丰工程勘察设计有限公司四川成都610000

特长隧道常常穿过复杂地质环境,采用传统钻探法进行勘察时难以获得全面的地质信息,应用物探技术加以补充能够更好地指导后续工程建设。介绍了可控源音频大地电磁法(CSAMT)的基本原理及标量测量法的使用步骤,结合工程实例,论述了该方法... 详细信息

特长隧道常常穿过复杂地质环境,采用传统钻探法进行勘察时难以获得全面的地质信息,应用物探技术加以补充能够更好地指导后续工程建设。介绍了可控源音频大地电磁法(CSAMT)的基本原理及标量测量法的使用步骤,结合工程实例,论述了该方法的实际应用过程。表明应用该方法可以降低隧道施工中可能遇到的风险,更好地保障工程安全。

关键词：物探技术可控源大地电磁法特长隧道地质勘察测量

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Electrochemical codeposition of typical α+β phases Mg-Li alloys from the molten LiCl-KCl-MgCl_2 system

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Rare Metals 2010年第2期29卷 198-203页

作者： ye Ke CHEN ye ZHANG Milin Key Laboratory of the Ministry of Education for Superlight Materials ＆ Surface Technology College of Materials Science and Chemical Engineering Harbin Engineering University Harbin 150001 China

Electrochemical codeposition of Mg-Li alloys on molybdenum electrodes was investigated in LiCl-KCl（50 wt.%：50 wt.%） melts containing different concentrations of MgCl2 at 973 *** voltammograms show that the underpotential deposition of lithium on pre-deposited magnesium leads to the formation of liquid Mg-Li *** deposition potentials of Mg（II） and Li（I） ions gradually near each other with MgCl2 concentration ***-Li alloys with typical α ＋ β phases could be obtained by potentiostatic electrolysis from LiCl-KCl melts containing 5 wt.% MgCl2 at -2.25 V ***/AgCl（cathodic current density 1.70 A·cm-2） for 2.5 h.α phase, α ＋ β phases, and β phase Mg-Li alloys with different lithium contents were obtained by potentiostatic electrolysis from LiCl-KCl melts with the different concentrations of *** samples were characterized by X-ray diffraction and scanning electron microscopy.

关键词： physical chemistry Mg-Li alloys electrochemical codeposition molten salt electrolysis

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