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Mechanical properties and microstructures of Mg-6Si alloys fabricated using the tungsten-inert-gas arc additive manufacturing

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China Foundry 2025年

作者： Peng-cheng Zhou Guo-qiang You Jin-yu Feng Lei Wang xiao Lin Bin Jiang College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University National Key Laboratory of Advanced Casting Technologies Chongqing University

Si-containing Mg alloys solidified at conventional rates often contain coarse and sharp Mg2Si phases,which can result in inferior material *** this study,Mg-6wt.%Si （Mg-6Si） alloy was prepared by wire arc additive manufacturing （WAAM）,employing the gas tungsten arc welding technique with rapid *** microstructures and mechanical properties of the WAAM alloy were investigated and compared with those of the as-cast samples produced using a metal *** results indicate that the WAAM Mg-6Si is harder and stronger than the as-cast *** microhardness of the WAAM Mg-6Si increases by 36.6%in comparison to that of as-cast Mg-6Si ***,the average tensile strengths at room temperature and 150°C increases by 63.4%and 21.3%,*** refines both the Mg2Si phase and the overall grains,resulting in a homogeneous morphology and improved mechanical *** granular Mg2Si phase,characterized by fine particles with a diffused distribution,shows a significant increase in *** acicular Mg2Si phase is distributed along the grain boundaries,and its concentration significantly *** average grain size of the Mg2Si phase is about 9.20μm,about 5 times *** refinement and distribution of the granular Mg2Si phase,as well as the reduction in the amount of needle-like Mg2Si particles,are the key factors for improving the mechanical properties of WAAM Mg-6Si alloy.

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Nitric Oxide Involved in Pinus thunbergii Reponse to the Invasion of Bursaphelenchus xylophilus,and NOS Mediated the Generation of NO

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Nitric Oxide Involved in Pinus thunbergii Reponse to the Inv...

Pronounced impact of size and shape effects on creep rupture life of a K439B superalloy combustion chamber casting simulator

第三届全国生物入侵大会

作者： Lu-zhen yu,xiao-qin wu~*,Jian-ren Ye,Sai-nan Zhang Nanjing Forestry University,The Key Laboratory of the Pest Prevention and Control of the Jiangsu Province,Nanjing 210037,China

Pine wilt disease caused by Bursaphelenchus xylophilus has caused great damage to forest resource and threantened ecological environment in China in the past ***,the role of NO(nitric oxide,NO) and ROS(reactive oxygen... 详细信息

关键词： Bursaphelenchus xylophilus Pinus thunbergii Nitric oxide Hydrogen peroxide Nitric oxide synthase Nitrate reductase

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China Foundry 2025年

作者： Wen-tong Liu Yi-dong wu Lei Gao Jing-yang Chen Cheng-bo xiao Xi-dong Hui State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

The size and shape effect(SSE) of components has become a critical issue for mechanical properties, application reliability, and processing. In this study, the creep rupture life(CRL) of components with different wall thicknesses and positions in a combustion chamber casing simulator made of K439B superalloy was investigated. The intrinsic mechanisms of the SSE were explored from the dendrite structure, volume fraction and size of the γ' phase, and element segregation, etc. It is shown that this casting exhibits a strong SSE of creep rupture life, characterized by a significant difference in the CRL values up to 60% with the variation of wall thickness and position in the casing. In terms of casting technology, the influence of SSE on CRL is actually determined by the cooling rate. The SSE on the creep rupture life originates from the dendrite structure(such as the secondary dendrite arm spacing), volume fraction size of the γ' phase in the dendrite trunk, and elements segregation rate. This work may have implications for the design and application of engineering components with large sizes and complex structures.

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Laser assisted phase transformation of carbon-based transition metal oxide electrode for high-performance supercapacitor application

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Science China Chemistry 2025年

作者： Mingzhen Xiu Jianghong Zhang yu Lu Xun Cao Kang Huang Siyu Zhu Bowei Zhang yu Liang Chunwang Zhao Junsheng wu Yizhong Huang School of Materials Science and Engineering Nanyang Technological University Energy Research Institute Interdisciplinary Graduate Programme Nanyang Technological University Institute of Sustainability for Chemicals Energy and Environment Agency for Science Technology and ResearchSingapore Institute of Advanced Materials and Technology University of Science and Technology Beijing School of Materials Science and Technology Shenyang University of Chemical Technology School of Materials Science and Hydrogen Energy Foshan University

Transitional metal oxides have a wide range of applications due to their superior *** enhanced performance of metal oxide relies on their desirable oxidation states,which is challenging to achieve and requires complex *** study demonstrates a facile strategy enabling rapid phase transformation of transition metal *** approach involves synthesis of a tetragonal Mn3O4/carbon cloth composite using the liquid plasma discharge deposition （LPDD） technique,followed by laser irradiation with the presence of ethylene glycol under an N2gas *** resulting face-centered cubic MnO/carbon cloth electrode exhibits an excellent capacitance of 1,125 F g-1at 2 A g-1,with remarkable capacitance retention of 95%after10,000 *** approach can be extended to other transition metals including Co,Cu,Cr,Fe,Ni,and *** simulations reveal the significance of ethylene glycol and the underlying mechanism associated with the phase transformation of transition metal *** present study offers a powerful technique for the phase transformation of transition metal oxide which can guide the development of new electrode materials with enhanced electrochemical properties for high-performance energy storage applications.

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铅锌烧结过程透气性状态及热状态优化控制

信息与控制 2004年第4期33卷 490-494,499页

作者：杜玉晓吴敏桂卫华中南大学信息科学与工程学院湖南长沙410083

本文针对具有非线性、强耦合、不确定、多约束特性的复杂铅锌密闭鼓风烧结过程 ,采用神经网络模型实现了透气性状态和烧穿点位置预测 ,集成惩罚函数法、基于聚类点的并行变步长网格法和最优保存简单遗传算法 (OMSGA)进行状态整体优化 .... 详细信息

本文针对具有非线性、强耦合、不确定、多约束特性的复杂铅锌密闭鼓风烧结过程 ,采用神经网络模型实现了透气性状态和烧穿点位置预测 ,集成惩罚函数法、基于聚类点的并行变步长网格法和最优保存简单遗传算法 (OMSGA)进行状态整体优化 .算法具有全局收敛性和工业有效性 ,解决了复杂铅锌烧结过程实时智能优化控制问题。

关键词：铅锌烧结过程惩罚函数法基于聚类点的并行变步长网格法最优保存简单遗传算法

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深埋特长隧道施工超前地质预报技术研究

吉林水利 2009年第5期 1-5页

作者：贺菲于孝武吉林省舒兰市水利工程处吉林舒兰132600

隧道施工过程中的超前地质预报是弥补初期勘探资料不足的有效手段。深埋特长隧道受地理位置和地质条件的限制,相对于其它浅埋隧道来讲,缺乏更多详细的地质资料,可能遇到更严重的工程地质问题及地质灾害。结合锦屏辅助洞施工过程中的超... 详细信息

隧道施工过程中的超前地质预报是弥补初期勘探资料不足的有效手段。深埋特长隧道受地理位置和地质条件的限制,相对于其它浅埋隧道来讲,缺乏更多详细的地质资料,可能遇到更严重的工程地质问题及地质灾害。结合锦屏辅助洞施工过程中的超前地质预报实践,着重阐述了深埋特长隧道超前地质预报的目的、方法和原则,分析比较了几种主要超前预报方法的工作原理、适用范围和优缺点,旨在为深埋特长隧道施工超前地质预报提供借鉴。

关键词：深埋特长隧道超前地质预报技术锦屏辅助洞

维普期刊数据库

Insight into the particle shape on the impact of dry granular flow against a rigid barrier: A DEM study

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Journal of Earth Science 2025年

作者： Rui-xiao Zhan Dong Su Xiang-Sheng Chen yuan-Jun Jiang Guo-Ping Lei Jing-Jing yu Key Laboratory for Resilient Infrastructures of Coastal Cities (MOE)， Shenzhen University College of Civil and Transportation Engineering， Shenzhen University School of Architecture and Urban Planning， Shenzhen University Shenzhen Key Laboratory of Green， Efficient and Intelligent Construction of Underground Metro Station， Shenzhen University Institute of Mountain Hazards and Environment， Chinese Academy of Sciences School of Transportation， Civil Engineering & Architecture， Foshan University

The effect of particle shape on the impact of dry granular flow remains an open area for further investigation. Five distinct particle shapes were examined in this study using discrete element simulations after calibrating the numerical model using a published work. The findings indicated that the particle shape had a significant influence on granular mobility. With negligible variations in normalized kinetic energy between particles of different shapes， the effect of particle shape on the increasing rate of kinetic energy became more obvious. All irregular particle scenarios had longer accumulated particle lengths down the channel than spherical particles. Variations in particle shape led to adjustments in the distribution of impact forces on the barrier. These findings substantially enhance our understanding of the distinctive effects of particle shapes on the impact mechanism of dry granular flow.

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Single-cell transcriptomic profiling reveals ZEB1-mediated regulation in microglial subtypes and the impact of exercise on neuroinflammatory responses

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Traditional Medicine Research 2025年第2期10卷 55-64页

作者： Jin-Fang wu Yi-Sheng Chen yu-Chun Xie Department of Rehabilitation Medicine Jiangsu Province Geriatric HospitalNanjing 210024China Fujian Key Laboratory of Toxicant and Drug Toxicology Medical CollegeNingde Normal UniversityNingde 352100China Central Laboratory Jiangsu Province Geriatric HospitalNanjing 210024China

Background:This study aims to identify distinct cellular subtypes within brain tissue using single-cell transcriptomic analysis,focusing on specific biomarkers that differentiate cell types and the effects of traditional and exercise ***:Four samples were analyzed:older control(OC),older exercise(OE),younger control(YC),and younger exercise(YE).Single-cell RNA sequencing was used to distinguish cellular subtypes through their biomarker *** visualization included violin and t-SNE plots to illustrate biomarker expression across cell clusters such as oligodendrocytes,microglia,and ***,BV2 cells were exposed to amyloid-beta fragments to simulate Alzheimer’s disease,assessing the impact of exercise-induced cellular ***:Distinct cellular subtypes were identified:oligodendrocytes(MBP,St18),microglia(Dock8),and astrocytes(Aqp4,Gpc5).Sample OE was predominantly oligodendrocytes,while YE had more astrocytes,inhibitory neurons,and Canal-Retzius *** showed a significant presence of Olfm3+ganglion ***1 gene knockout revealed changes in SMAD family gene expression,which regulate *** stress levels were also ***:This profiling enhances our understanding of brain cellular functions and interactions,potentially informing targeted therapies in neurological *** may influence brain cell immune responses and cell death pathways by regulating specific gene expressions,offering new insights for treating neuroinflammation and degeneration.

关键词： single-cell transcriptomics brain tissue cellular subtypes biomarker expression neuronal diversity

Experimental demonstration of 220-GHz terahertz signals wireless transmission over 4.6 km

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Science China(Information Sciences) 2025年第1期68卷 386-388页

作者： Yi WEI Jianjun yu Mingxu WANG Xiongwei YANG Qiutong ZHANG Jingwen TAN Bing ZHANG Ying wu Yang HAN Peng TIAN Wen ZHOU Kaihui WANG Feng ZHAO State Key Laboratory of ASIC and System Key Laboratory for Information Science of Electromagnetic Waves (MoE)School of Information Science and Technology Fudan University School of Electronic Engineering Xi'an University of Posts and Telecommunications

The advancement of terahertz (THz) communication technology drives the evolution of wireless communication systems,offering novel pathways and technical means for the development of future 6G communication *** wireless communication systems are often constrained by bandwidth limitations of electronic devices in high frequency ***,THz communication technology leverages the characteristics of electromagnetic waves to transcend these limitations,enabling communication athigher frequencies and wider bandwidths.

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