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Effect of Ti and Ta content on the oxidation resistance of Co-Ni-based superalloys

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 351-361页

作者： Yuheng Zhang zixin li Yunwei Gui Huadong Fu Jianxin Xie Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China Key Laboratory for Advanced Materials Processing(MOE) University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China

Co-Ni-based superalloys are known for their capability to function at elevated temperatures and superior hot corrosion and thermal fatigue ***,these alloys show potential as crucial high-temperature structural materials for aeroengine and gas turbine hot-end *** previous work elucidated the influence of Ti and Ta on the high-temperature mechanical properties of ***,the intricate interaction among elements considerably affects the oxidation resistance of *** this paper,Co-35Ni-10Al-2W-5Cr-2Mo-1Nb-xTi-(5−x)Ta alloys(x=1,2,3,4)with varying Ti and Ta contents were designed and compounded,and their oxidation resistance was investigated at the temperature range from 800 to 1000℃.After oxidation at three test conditions,namely,800℃for 200 h,900℃for 200 h,and 1000℃for 50 h,the main structure of the oxide layer of the alloy consisted of spinel,Cr_(2)O_(3),and Al_(2)O_(3)from outside to *** consisting of Ta,W,and Mo formed below the Cr_(2)O_(3)*** interaction of Ti and Ta imparted the highest oxidation resistance to 3Ti2Ta ***,an excessive amount of Ti or Ta resulted in an adverse effect on the oxidation resistance of the *** study reports the volatilization of W and Mo oxides during the oxidation process of Co-Ni-based cast superalloys with a high Al content for the first time and explains the formation mechanism of holes in the oxide *** results provide a basis for gaining insights into the effects of the interaction of alloying elements on the oxidation resistance of the alloys they form.

关键词： Co-Ni-based superalloys high-temperature oxidation Ti and Ta elements formation mechanism of holes

A Review of Magnesium Alloys as Structure–Function Integrated Materials

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1301-1338页

作者： Zhenfei Jiang Bo Hu zixin li Fanjin Yao Jiaxuan Han Dejiang li Xiaoqin Zeng Wenjiang Ding National Engineering Research Center of light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China

Magnesium alloys have a significant advantage,lower density over the other structure materials;hence,they have been widely used in various fields such as transportation and *** the development of research and the enlargement of the research scope,more advantages have been revealed:excellent shielding efficiency,extraordinarily high damping capacity,as well as impressive thermal ***,Mg alloys have the potential to be various functional materials,such as electromagnetic shielding material,damping material,and thermal conductive *** review comprehensively summarizes the research progress and the up-to-date summary of Mg alloys as structure–function integrated materials in recent *** atoms,heat treatment,deformation,secondary phase,and temperature,which have a significant influence on the properties of magnesium alloys,are *** expect this review to be helpful for those who are working on developing structure–function integrated materials with superior comprehensive performance.

关键词： Magnesium alloys Structure-function integrated Electromagnetic shielding Damping capacity Thermal conductivity

Force-induced Caspase-1-dependent pyroptosis regulates orthodontic tooth movement

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International Journal of Oral Science 2024年第2期16卷 238-250页

作者： liyuan Chen Huajie Yu zixin li Yu Wang Shanshan Jin Min Yu lisha Zhu Chengye Ding Xiaolan Wu Tianhao Wu Chunlei Xun Yanheng Zhou Danqing He Yan liu Department of Orthodontics Central LaboratoryPeking University School and Hospital for Stomatology&National Center for Stomatology&National Clinical Research Center for Oral Diseases&National Engineering Research Center of Oral Biomaterials and Digital Medical Devices&Beijing Key Laboratory of Digital Stomatology&Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health&NMPA Key Laboratory for Dental Materials&National Engineering Research Center of Oral Biomaterials and Digital Medical DevicesBeijingChina Peking University Hospital of Stomatology Fourth Division BeijingChina

Pyroptosis,an inflammatory caspase-dependent programmed cell death,plays a vital role in maintaining tissue homeostasis and activating inflammatory *** tooth movement(OTM)is an aseptic force-induced inflammatory bone remodeling process mediated by the activation of periodontal ligament(PDL)progenitor ***,whether and how force induces PDL progenitor cell pyroptosis,thereby influencing OTM and alveolar bone remodeling remains *** this study,we found that mechanical force induced the expression of pyroptosis-related markers in rat OTM and alveolar bone remodeling *** or enhancing pyroptosis level could suppress or promote OTM and alveolar bone remodeling *** Caspase-1^(−/−)mice,we further demonstrated that the functional role of the force-induced pyroptosis in PDL progenitor cells depended on ***,mechanical force could also induce pyroptosis in human ex-vivo force-treated PDL progenitor cells and in compressive force-loaded PDL progenitor cells in vitro,which influenced ***,transient receptor potential subfamily V member 4 signaling was involved in force-induced Caspase-1-dependent pyroptosis in PDL progenitor ***,this study suggested a novel mechanism contributing to the modulation of osteoclastogenesis and alveolar bone remodeling under mechanical stimuli,indicating a promising approach to accelerate OTM by targeting Caspase-1.

关键词： homeostasis movement thereby

钛酸铋钠基无铅弛豫铁电陶瓷的能量存储性能及稳定性

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硅酸盐学报 2024年第4期52卷 1257-1266页

作者：顾陇李子昕周文杰闫非西安电子科技大学先进材料与纳米科技学院西安710126

近年来,陶瓷电介质电容器因其功率密度高、充放电速度快、循环寿命长、稳定性好等特点而在脉冲功率系统中得到广泛关注。然而环境友好型无铅储能陶瓷的能量密度和能量转换效率普遍偏低,严重制约了实际应用的需求。基于此,采用固相反应... 详细信息

近年来,陶瓷电介质电容器因其功率密度高、充放电速度快、循环寿命长、稳定性好等特点而在脉冲功率系统中得到广泛关注。然而环境友好型无铅储能陶瓷的能量密度和能量转换效率普遍偏低,严重制约了实际应用的需求。基于此,采用固相反应法制备了化学组成为(1–x)(0.94Bi_(0.55)Na_(0.45)TiO_(3)-0.06BaTiO_(3))-xSr_(0.7)Bi_(0.2)TiO_(3)[简记为(1–x)BNBT-xSBT,其中x=0,0.10,0.20,0.30,0.40]的无铅陶瓷,系统地研究了不同SBT含量对(1–x)BNBT-xSBT陶瓷相结构、微观形貌、介电性能和能量存储性能的影响。通过增加(1–x)BNBT-xSBT陶瓷的SBT含量,其介电弛豫峰逐渐向低温方向移动,并且介电常数的温度稳定性也得到了显著提升,在25.0~343.9℃温度范围内的变化量小于±10%。同时,(1–x)BNBT-xSBT陶瓷呈现出类反铁电体的电滞回线特征,其电滞回线的滞后现象随SBT含量增加而减小。当x=0.30时,陶瓷样品表现出细长的电滞回线形状,在192 kV/cm较低电场强度下,有效储能密度可以达到2.16 J/cm^(3),相应的储能效率约为90%,并且表现出优异的频率稳定性和循环稳定性。

关键词：钛酸铋钠无铅陶瓷能量存储稳定性介电性能

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变长分段直线感应电机数学建模

中国电机工程学报 2024年第13期44卷 5338-5347,I0027页

作者：徐飞李子欣孔甘霖史黎明李耀华中国科学院电力电子与电气驱动重点实验室(中国科学院电工研究所) 北京市海淀区100190 中国科学院大学北京市石景山区100049 齐鲁中科电工先进电磁驱动技术研究院山东省济南市250100

变长分段直线感应电机参数具有不连续、快速时变及强耦合特性,这给电磁暂态建模带来挑战。该文引入3种时变因子推导出具有参数时变特性的变长分段直线感应电机数学表达式。通过分析变长分段直线感应电机定子与动子的电磁耦合特性及时变... 详细信息

变长分段直线感应电机参数具有不连续、快速时变及强耦合特性,这给电磁暂态建模带来挑战。该文引入3种时变因子推导出具有参数时变特性的变长分段直线感应电机数学表达式。通过分析变长分段直线感应电机定子与动子的电磁耦合特性及时变因子与状态变量之间的耦合关系,建立定子、动子及时变因子相互解耦的数学模型。仿真结果表明,该数学模型计算的电压、电流和速度与有限元计算结果差别小于6%,验证了数学模型的准确性。硬件在环实验结果表明,在高速工况下数学模型可以准确模拟系统的电磁暂态特性,验证了数学模型的解耦能力及数值运算稳定性。

关键词：变长分段直线电机时变因子解耦数学建模

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Prognositic value of anoikis and tumor immune microenvironment-related gene in the treatment of osteosarcoma

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中南大学学报（医学版） 2024年第5期49卷 758-774页

作者： WANG Dong DENG Qing PENG Yi TONG Zhaochen li zixin HUANG liping ZENG Jin li Jinsong MIAO Jinglei CHEN Shijie Department of Spine Surgery Third Xiangya HospitalCentral South UniversityChangsha 410013 Shanghai Key Laboratory of Regulatory Biology Institute of Biomedical SciencesSchool of Life SciencesEast China Normal UniversityShanghai 200241China

Objective:Osteosarcoma is a highly aggressive primary malignant bone tumor commonly seen in children and adolescents,with a poor ***-dependent cell death(anoikis)has been proven to be indispensable in tumor metastasis,regulating the migration and adhesion of tumor cells at the primary ***,as a type of programmed cell death,anoikis is rarely studied in osteosarcoma,especially in the tumor immune *** study aims to clarify prognostic value of anoikis and tumor immune microenvironment-related gene in the treatment of ***:Anoikis-related genes(ANRGs)were obtained from *** information and ANRGs expression profiles of osteosarcoma patients were sourced from the therapeutically applicable research to generate effective therapies and Gene Expression Omnibus(GEO)*** highly associated with tumor immune microenvironment were identified by the estimate package and the weighted gene coexpression network analysis(WGCNA)*** learning algorithms were performed to construct long-term survival predictive strategy,each sample was divided into high-risk and low-risk subgroups,which was further verified in the GEO ***,based on single-cell RNA-seq from the GEO database,analysis was done on the function of signature genes in the osteosarcoma tumor ***:A total of 51 hub ANRGs closely associated with the tumor microenvironment were identified,from which 3 genes(MERTK,BNIP3,S100A8)were selected to construct the prognostic *** differences in immune cell activation and immune-related signaling pathways were observed between the high-risk and low-risk groups based on tumor microenvironment analysis(all Pling ***:The prognostic model based on ANRGs and tumor microenvironment

关键词： anoikis tumor immune microenvironment bioinformatics prognosis osteosarcoma

亚文化视域下“文旅+喊麦”短视频流行现象研究

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新闻研究导刊 2024年第13期15卷 80-83页

作者：李梓歆西南石油大学艺术学院四川成都610599

“喊麦”是选取独特的音乐节奏、洗脑的歌词,加以读或唱的表演方式。当下,“喊麦”受到了大量年轻人关注和喜爱。然而,由于其简单直接,侧重情感宣泄,歌词内容缺乏深度和艺术性,因此“喊麦”亚文化自诞生之日起,便因其天然的“草根性”... 详细信息

“喊麦”是选取独特的音乐节奏、洗脑的歌词,加以读或唱的表演方式。当下,“喊麦”受到了大量年轻人关注和喜爱。然而,由于其简单直接,侧重情感宣泄,歌词内容缺乏深度和艺术性,因此“喊麦”亚文化自诞生之日起,便因其天然的“草根性”而饱受非议。随着互联网和新媒体的迅猛发展,传统的文旅宣传方式已无法满足当代年轻人对个性化、多元化、创新性娱乐内容的需求。在此背景下,文旅产业积极寻求创新突破路径,以新媒体平台为传播载体,为各地旅游景点造势宣传。但单调和缺乏新意的传统宣传内容吸引力明显不足,文旅宣传事业面临极大挑战。2023年春节期间,“文旅+喊麦”短视频这种新型的文化表达方式兴起并迅速走红网络,其将“喊麦”文化与各地文旅景点的特色相结合,通过独特的视角和表达方式,让全国各地文旅视频迅速“出圈”。这种流行现象不仅展示了“喊麦”亚文化的独特魅力,也为我国文旅宣传事业带来了新的机遇。基于此,文章从亚文化视域出发,厘清“喊麦”的亚文化风格表征,通过探究“文旅+喊麦”短视频爆火现象,分析“喊麦”亚文化在融入主流文化过程中所展现的积极影响,以及亚文化被主流文化收编给当下文化融合带来的启示。

关键词： “文旅+喊麦” 亚文化短视频文化融合

我国数字鸿沟治理的政策主题、府际关系及扩散变迁--基于2006-2022年国家层面政策文件的计量分析

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智库理论与实践 2024年第3期9卷 7-18页

作者：黄丽娜李子鑫贵州民族大学传媒学院贵阳550000

[目的/意义]本文旨在揭示我国数字鸿沟治理的政策主题、府际关系、政策扩散及其变迁。[方法/过程]以国家层面政策文件为样本,通过LDA(Latent Dirichlet Allocation)主题建模、社会网络分析等计量方法,辅之以桑基图等可视化手段,分析并... 详细信息

[目的/意义]本文旨在揭示我国数字鸿沟治理的政策主题、府际关系、政策扩散及其变迁。[方法/过程]以国家层面政策文件为样本,通过LDA(Latent Dirichlet Allocation)主题建模、社会网络分析等计量方法,辅之以桑基图等可视化手段,分析并呈现了我国数字鸿沟治理政策的阶段性特征及演化规律。[结果/结论]研究表明:我国数字鸿沟治理经历了3个阶段,演进过程符合数字社会发展过程中数字鸿沟问题凸显程度的变化逻辑;消除城乡数字鸿沟是一个连贯性主题,而新兴主题则呼应了COVID-19疫情情景下的社会需求;府际关系呈“松散”到“中心-边缘”再到“多核心”的演变逻辑;政策扩散强度由弱到强,当前核心政策紧密关注老年人数字鸿沟治理议题。未来,应重新审视数字鸿沟的动态性转变,在数字化进程中重点关注与解决边缘人群数字化发展难题。

关键词：数字鸿沟政策变迁政策主题府际关系政策扩散

绝经后2型糖尿病LRP5基因多态性与骨量异常的研究

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中国骨质疏松杂志 2024年第2期30卷 210-215页

作者：黎娅李军李思源王曦龄卢韵秋李子昕石河子大学第一附属医院新疆石河子832000 石河子大学医学院新疆石河子832000 湖南省娄底市中心医院湖南娄底417600

目的分析低密度脂蛋白受体相关蛋白5(low density lipoprotein receptor related protein 5,LRP5)rs556442、rs312778位点基因多态性及突变在绝经后女性2型糖尿病(type 2 diabetes mellitus,T2DM)患者中骨量异常的意义。方法收集2021年5月至2023年5月新疆石河子地区的142例绝经后女性资料进行回顾性分析,分为正常对照组(A组,n=29)、T2DM组(B组,n=30)、骨量降低组(C组,n=28)、骨量降低+T2DM组(D组,n=55)。收集记录相关基线资料,运用全自动生化测定仪测定受试者血糖、血脂及骨代谢指标。通过双能X线骨密度仪测定骨密度(bone mineral density BMD),LRP5基因位点多态性采用飞行时间质谱法(MALDI-TOF-MS)测定,采用SNPscan技术对上述SNP位点进行基因分型。结果①四组基线资料比较,绝经年限、年龄及腰臀比(waist hip ratio,WHR)比较差异具有统计学意义(P0.05);④rs556442位点:与AA基因型相比,B、C组AG/GG基因型的股骨颈BMD水平降低;D组AG/GG型的HDL血清学水平降低(P0.05)。结论新疆石河子地区绝经后T2DM女性患者LRP5基因rs556442、rs312778基因位点的突变可能与骨量降低有关。

关键词：低密度脂蛋白受体相关蛋白5 绝经女性基因突变骨量异常