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Volume-averaged modeling of multiphase solidification with equiaxed crystal sedimentation in a steel ingot

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China Foundry 2024年第3期21卷 229-238页

作者： Xiao-lei Zhu Shuang Cao Rui Guan Ji yang Zhe Ning Xin-gang Ai Sheng-li Li Xin-cheng Miao The key Laboratory of Material Forming and Structure Property Control Anshan 114051LiaoningChina State Key Laboratory of Metal Material for Marine Equipment and Application Anshan 114009LiaoningChina School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina

Macrosegregation is a critical factor that limits the mechanical properties of *** impact of equiaxed crystal sedimentation on macrosegregation has been extensively studied,as it plays a significant role in determining the distribution of alloying elements and impurities within a *** improve macrosegregation in steel connecting shafts,a multiphase solidification model that couples melt flow,heat transfer,microstructure evolution,and solute transport was established based on the volume-averaged Eulerian-Eulerian *** this model,the effects of liquid phase,equiaxed crystals,columnar dendrites,and columnar-to-equiaxed transition(CET)during solidification and evolution of microstructure can be considered *** sedimentation of equiaxed crystals contributes to negative macrosegregation,where regions between columnar dendrites and equiaxed crystals undergo significant A-type positive macrosegregation due to the ***,noticeable positive macrosegregation occurs in the area of final solidification in the *** improvement in macrosegregation is beneficial for enhancing the mechanical properties of connecting *** mitigate the thermal convection of molten steel resulting from excessive superheating,reducing the superheating during casting without employing external fields or altering the design of the ingot mold is indeed an effective approach to control macrosegregation.

关键词： ingot casting multiphase solidification model equiaxed crystal sedimentation microstructure macrosegregation

Nonvolatile and reconfigurable two-terminal electro-optic duplex memristor based on Ⅲ-nitride semiconductors

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Light(Science & Applications) 2024年第4期13卷 706-716页

作者： Zhiwei Xie Ke Jiang Shanli Zhang Jianwei Ben Mingrui Liu Shunpeng Lv yang Chen Yuping Jia Xiaojuan Sun Dabing Li State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesDongnanhu Road No.3888Changchun 130033China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesYuquan Road No.19100049 BeijingChina

With the fast development of artificial intelligence(AI),Internet of things(IOT),etc,there is an urgent need for the technology that can efficiently recognize,store and process a staggering amount of *** AlScN material has unique advantages including immense remnant polarization,superior temperature stability and good latticematch to other III-nitrides,making it easy to integrate with the existing advanced III-nitrides material and device ***,due to the large band-gap,strong coercive field,and low photo-generated carrier generation and separation efficiency,it is difficult for AlScN itself to accumulate enough photo-generated carriers at the surface/interface to induce polarization inversion,limiting its application in in-memory sensing and *** this work,an electro-optic duplex memristor on a GaN/AlScN hetero-structure based Schottky diode has been *** twoterminal memristor shows good electrical and opto-electrical nonvolatility and *** both electrical and opto-electrical modes,the current on/off ratio can reach the magnitude of 104,and the resistance states can be effectively reset,written and long-termly *** on this device,the“IMP”truth table and the logic“False”can be successfully reproduced,indicating the huge potential of the device in the field of in-memory sensing and computing.

关键词： polarization duplex limiting

Numerical investigation on thermomechanical behavior of alumina–calcium hexaluminate refractories for purging plug

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Journal of Iron and Steel Research(International) 2024年第2期31卷 389-400页

作者： Li-ping Pan Ya-wei Li Fang-guan Tan Yi-chen Chen yang-fan Xu Zhu He Bao-kuan Li The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan430081HubeiChina National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology Wuhan University of Science and TechnologyWuhan430081HubeiChina

Alumina–spinel refractories used in slit-type purging plugs are susceptible to cross-sectional damage,resulting in a serious mismatch between their service life and that of ***–calcium hexaluminate refractories have gradually become the new trend in purging plug materials with the development of refining *** thermomechanical damage of slit-type purging plugs with alumina–calcium hexaluminate refractory was investigated by the thermo-solid coupling *** with the polynomial fitting and design of experiments methods,the influence of thermophysical parameters on temperature and thermal stress of alumina–calcium hexaluminate refractories for purging plugs was systematically *** results show that the maximum thermal stress of the purging plugs appears during the stages of steel transporting and stirring,and the vulnerable parts are located above Y=0.323 *** thermal conductivity and the coefficient of thermal expansion of the material are the most sensitive parameters to the temperature and thermal stress inside the structure,*** addition of more calcium hexaluminate can relieve the stress concentration and large deformation around the ***,when the content of calcium hexaluminate is 47 wt.%and in the form of aggregate-binder,the temperature and thermal stress distribution inside the refractory are optimal,which can effectively improve the service life of the slit-type purging plug.

关键词： Purging plug Thermomechanical damage Refractory Design of experiments method Stress

“自动写作”发展史——论人工智能向艺术智能的转换

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外国文学 2024年第1期 131-143页

作者：史良北京外国语大学德语学院北京100089

ChatGPT等一系列人工智能软件的出现在引发公众热议的同时,也催生了有关人工智能会否取代人类的终极思考。人工智能业已渗透至人类智性世界的各个领域,并在许多领域完成了对人类的超越。人类的艺术创造力俨然成了这一技术亟待跨越的最... 详细信息

ChatGPT等一系列人工智能软件的出现在引发公众热议的同时,也催生了有关人工智能会否取代人类的终极思考。人工智能业已渗透至人类智性世界的各个领域,并在许多领域完成了对人类的超越。人类的艺术创造力俨然成了这一技术亟待跨越的最后一道门槛。本文试以凝聚人类思想精华的“写作”为对象,以不同时期、不同领域中的“自动写作”实践为线索,探究当前人工智能进行艺术创作的原理与其深层局限,借以观照人工智能与艺术智能之间的转换可能性及其所引发的美学与人类学思考。

关键词：自动写作超现实主义人工智能与艺术智能

Long-term thinning decreases the contribution of heterotrophic respiration to soil respiration in subalpine plantations

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Journal of Forestry Research 2024年第3期35卷 189-204页

作者： Longfei Chen Zhibin He Wenzhi Zhao Xi Zhu Qin Shen Mingdan Song Zhengpeng Li Junqia Kong Shuping yang Yuan Gao Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000People's Republic of China State Forestry Administration Key Laboratory of Forest Resources and Environmental Management Beijing Forestry UniversityBeijing 100083People's Republic of China Academy of Agriculture and Forestry Sciences Qinghai UniversityXining 810000People's Republic of China College of Landscape Architecture Zhejiang A&F UniversityHangzhou 310000People's Republic of China

Interest in the dynamics of soil respiration(R_(S))in subalpine forest ecosystems is increasing due to their high soil carbon density and potential sensitivity to environmental ***,as a principal silvicultural practice,the long-term impacts of thinning on R_(S) and its heterotrophic and autotrophic respiration components(R_(h) and Ra,respectively)in subalpine plantations are poorly understood,espe-cially in winter.A 3-year field observation was carried out with consideration of winter CO_(2) efflux in middle-aged sub-alpine spruce plantations in northwestern China.A trench-ing method was used to explore the long-term impacts of thinning on Rs,Rn and R_(a).Seventeen years after thinning,mean annual Rs,Rn and R_(a) increased,while the contribu-tion of R_(h) to R_(s) decreased with thinning *** significantly decreased winter R,because of the reduction in R_(n) but had no significant effect on *** temperature sensitivity(Q_(10))of R_(h) and R_(a) also increased with thinning intensity,with lower Q_(10) values for R_(h)(2.1-2.6)than for Ra(2.4-2.8).The results revealed the explanatory variables and pathways related to R_(n) and R_(a) *** increased soil moisture and nitrate nitrogen(NO_(3)^(-)-N),and the enhanced nitrogen and water availability promoted R_(h) and R_(a) by improving fine root biomass and microbial *** results highlight the positive roles of NO_(3)^(-)-N in stimulating R_(s) components following long-term ***,applications of nitrogen fertilizer are not recommended while thinning subalpine spruce plantations from the perspective of reducing soil CO_(2) *** increased Q_(10) values of R_(s) components indicate that a large increase in soil CO_(2) emissions would be expected following thinning because of more pronounced climate warming in alpineregions.

关键词： Heterotrophic respiration Autotrophic respiration Long-term thinning impacts Cold seasons Subalpine plantations Temperature sensitivity

Thermal conductivity of GeTe crystals based on machine learning potentials

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Chinese Physics B 2024年第4期33卷 104-107页

作者：张健张昊春李伟峰张刚 School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China Institute of High Performance Computing Agency for ScienceTechnology and ResearchSingapore 138632Singapore School of Physics&State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

GeTe has attracted extensive research interest for thermoelectric *** this paper,we first train a neuroevolution potential(NEP)based on a dataset constructed by ab initio molecular dynamics,with the Gaussian approximation potential(GAP)as a *** phonon density of states is then calculated by two machine learning potentials and compared with density functional theory results,with the GAP potential having higher ***,the thermal conductivity of a GeTe crystal at 300 K is calculated by the equilibrium molecular dynamics method using both machine learning potentials,and both of them are in good agreement with the experimental results;however,the calculation speed when using the NEP potential is about 500 times faster than when using the GAP ***,the lattice thermal conductivity in the range of 300 K-600 K is calculated using the NEP *** lattice thermal conductivity decreases as the temperature increases due to the phonon anharmonic *** study provides a theoretical tool for the study of the thermal conductivity of GeTe.

关键词： machine learning potentials thermal conductivity molecular dynamics

人口变化格局下中国高等教育现代化:需求指向、内在逻辑与实践进路

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深圳大学学报（人文社会科学版） 2024年第3期41卷 5-16页

作者：陈亮陕西师范大学教育学部陕西西安710062

人口持续负增长以及少子老龄化已成为全球面临的共同挑战,这一人口变化格局为高等教育现代化增添了不确定性,同时也为其发展带来新的需求,即满足人民群众对优质高等教育的需求、回应高等教育可持续发展的需求、关照经济社会高质量发展... 详细信息

人口持续负增长以及少子老龄化已成为全球面临的共同挑战,这一人口变化格局为高等教育现代化增添了不确定性,同时也为其发展带来新的需求,即满足人民群众对优质高等教育的需求、回应高等教育可持续发展的需求、关照经济社会高质量发展的需求。高等教育现代化进程与人口变化格局的需求相互交融,均需以关照人口规模为逻辑起点、以优化人口结构为逻辑线路、以提升人口质量为逻辑旨归。面向未来,人口格局将持续变化,高等教育现代化需直面挑战并把握机遇。在把握高等教育现代化需求指向与内在逻辑的同时,重新构想实践进路:构建“数智融合”新生态,持续完善数字治理体系,加快实现高等教育数字化转型;优化高等教育资源配置,探索人才培养创新模式,持续培育并输出新质生产力;关照全球共同利益,提升高等教育国际化水平;构建现代终身教育体系,释放老年人口质量红利。以实践进路为指导,实现多元主体协同,形成推动高等教育现代化进程的倍增效应,在不确定性中完成我国高等教育现代化从优秀到卓越的跨越。

关键词：人口变化格局中国式现代化高等教育现代化需求指向内在逻辑

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Secreted Frizzled-Related Protein 5 Mediates Wnt5a Expression in Microcystin-Leucine-Arginine-Induced Liver Lipid Metabolism Disorder in Mice

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Biomedical and Environmental Sciences 2024年第8期37卷 850-864页

作者： Meiyan yang Furong Yu Qianqian Ji Huiying Zhang Jiaxiang Zhang Daojun Chen Department of Occupational Health and Environmental Health School of Public HealthAnhui Medical UniversityHefei 230032AnhuiChina School of Medical Technology Anhui Medical CollegeHefei 230601AnhuiChina

Objective Microcystin-leucine-arginine(MC-LR)exposure induces lipid metabolism disorders in the *** frizzled-related protein 5(SFRP5)is a natural antagonist of winglesstype MMTV integration site family,member 5A(Wnt5a)and an anti-inflammatory *** this study,we aimed to investigate whether MC-LR can induce lipid metabolism disorders in hepatocytes and whether SFRP5,which has anti-inflammatory effects,can alleviate the effects of hepatic lipid metabolism by inhibiting the Wnt5a/Jun N-terminal kinase(JNK)*** We exposed mice to MC-LR in vivo to induce liver lipid metabolism ***,mouse hepatocytes that overexpressed SFRP5 or did not express SFRP5 were exposed to MC-LR,and the effects of SFRP5 overexpression on inflammation and Wnt5a/JNK activation by MC-LR were *** MC-LR exposure induced liver lipid metabolism disorders in mice and significantly decreased SFRP5 mRNA and protein levels in a concentration-dependent ***5 overexpression in AML12cells suppressed MC-LR-induced *** of SFRP5 also inhibited Wnt5a and phosphorylation of *** MC-LR can induce lipid metabolism disorders in mice,and SFRP5 can attenuate lipid metabolism disorders in the mouse liver by inhibiting Wnt5a/JNK signaling.

关键词： Jun N-terminal kinase Secreted frizzled-related protein 5 Wnt5a Hepatic lipid metabolism disorder

Crossed renal ectopia with rectal cancer:A case report

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World Journal of Clinical Cases 2024年第12期12卷 2122-2127页

作者： Zhen-Wei Tang Hui-Feng yang Zhao-Yu Wu Chang-You Wang Department of General Surgery North China University of Science and Technology Affiliated HospitalTangshan 063000Hebei ProvinceChina

BACKGROUND Crossed renal ectopia(CRE)occurs when one kidney crosses the midline from the primary side to the contralateral side while the ureter remains on the primary *** cancer,one of the most common malignant tumors of the digestive tract,refers to cancer from the dentate line to the rectosigmoid *** concurrent presentation of CRE alongside rectal cancer is an uncommon clinical *** SUMMARY Herein,we report a 69-year-old male patient with rectal cancer who was diagnosed with CRE via computed tomography during *** thorough preoperative evaluations,the patient underwent Dixon *** We performed laparoscopic radical resection of rectal cancer and adequate lymph node removal in a patient with CRE with no postoperative discomfort.

关键词： Rectal cancer Crossed renal ectopia Anatomy Laparoscopic surgery Case report