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Effect of Nb-V microalloying on the hot deformation behavior of medium Mn steels

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 360-368页

作者： yumeng Wang Qinyi Guo Bin Hu Haiwen luo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The influence of Nb-V microalloying on the hot deformation behavior and microstructures of medium Mn steel(MMS)was investigated by uniaxial hot compression *** establishing the constitutive equations for simulating the measured flow curves,we successfully constructed deformation activation energy(Q)maps and processing maps for identifying the region of flow *** concluded the following consequences of Nb-V alloying for MMS.(i)The critical strain increases and the increment diminishes with the increasing deformation temperature,suggesting that NbC precipitates more efficiently retard dynamic recrystallization(DRX)in MMS compared with solute Nb.(ii)The deformation activation energy of MMS is significantly increased and even higher than that of some reported high Mn steels,suggesting that its ability to retard DRX is greater than that of the high Mn content.(iii)The hot workability of MMS is improved by narrowing the hot processing window for the unstable flow stress,in which fine recrystallized and coarse unrecrystallized grains are present.

关键词： medium manganese steel niobium-vanadium microalloying flow behavior dynamic recrystallization hot workability

Brain endothelial cyclic GMP-AMP synthase(cGAS)-stimulator of interferon genes(STING)signaling pathway in aging and neurodegeneration

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Neural Regeneration Research 2025年第7期20卷 2005-2007页

作者： Bryan Sun Lulin Li Jian luo Palo Alto Veterans Institute for Research VA Palo Alto Health Care SystemPalo AltoCAUSA Polytrauma System of Care VA Palo Alto Health Care SystemPalo AltoCAUSA

The cyclic GMP-AMP synthase(cGAS)-stimulator of interferon genes(STING)signaling pathway has emerged as a key mediator of *** current studies primarily attribute its effects to neurons and glial cells,emerging research suggests that cGAS-STING signaling may play a critical role in cerebral vasculature,particularly in brain endothelial ***,studying the role 7of inflammation caused by the cGAS-STING pathway in brain endothelial cells could provide a more comprehensive understanding of neuroinflammatory disease and new avenues for therapeutic ***,we review the multifaceted role of global cGAS-STING signaling in various neurological and neuroinflammatory diseases and the potential contribution of cGAS-STING in brain endothelial cells.

关键词： stimulator interferon inflammation

牙周炎晚期伴上颌牙槽骨前突畸形患者即刻种植全牙列固定修复的侧貌变化初探

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中华口腔医学杂志 2017年第10期52卷 625-630页

作者：张宇林野刘洋罗佳邸萍马婷北京大学口腔医学院·口腔医院种植科、口腔数字化医疗技术和材料国家工程实验室、口腔数字医学北京市重点实验室 100081 北京大学口腔医学院·口腔医院种植科、口腔数字化医疗技术和材料国家工程实验室、口腔数字医学北京市正畸科 100081

目的探讨牙周炎晚期伴上颌牙槽骨前突畸形患者即刻种植全牙列固定修复后的侧貌变化特点及临床效果,为临床诊治提供参考依据.方法选取2013年1月至2016年10月于北京大学口腔医学院·口腔医院种植科连续就诊的牙周炎晚期伴上颌牙槽骨前... 详细信息

目的探讨牙周炎晚期伴上颌牙槽骨前突畸形患者即刻种植全牙列固定修复后的侧貌变化特点及临床效果,为临床诊治提供参考依据.方法选取2013年1月至2016年10月于北京大学口腔医学院·口腔医院种植科连续就诊的牙周炎晚期伴上颌牙槽骨前突畸形拟行全牙列固定修复的患者.拔除上颌余留患牙,截除上颌前部过突的牙槽骨,即刻植入4~6枚种植体行全牙列即刻固定修复,术后6个月完成最终修复.术中测量牙槽骨截骨高度.比较术前和最终修复后软硬组织头影测量项目的变化.采用视觉模拟评分法对容貌美观变化进行评价.结果共完成10例患者的双颌全牙列种植固定修复,共植入89枚种植体;上颌平均植入4.5枚.上颌前部牙槽骨平均截骨高度（6.3±1.8）mm.最终修复后上中切牙切缘较术前向腭侧移动（5.5±2.7）mm,向根方移动（1.6±1.2）mm,上中切牙长轴向腭侧倾斜9.6°±8.1°.最终修复后患者鼻唇角比术前增大10.5°±6.4°.患者和医师均认为最终修复后容貌美观比术前有明显改善.结论对牙周炎晚期伴上颌牙槽骨前突畸形的患者,通过拔除患牙,截除一定高度的上颌前部牙槽骨,腭向设计修复体排牙位置,可明显改善患者面下1/3解剖结构的位置关系及患者的美观感受.

关键词：牙周炎牙种植牙槽骨切除术测颅法

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上海铁路南站主站房透光屋面系统

建筑技术 2006年第4期37卷 256-258页

作者：周小丽罗忆珠海市晶艺玻璃工程有限公司北京分公司北京100045

上海铁路南站主站房屋面工程采用多层构造阳光板屋面系统的构造和节点设计,为高通透性的屋面系统的开发及推广,提供了一种新的设计依据。

关键词：遮阳百叶阳光板吊顶二次防水节点

2008年8月30日攀枝花MS6.1地震序列深度及震源区应力特征

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中国科学：地球科学 2020年第3期50卷 404-417页

作者：罗艳赵里田建慧中国地震局地震预测研究所地震预测重点实验室北京100036 北京大学地球与空间科学学院北京100871

对2008年8月30日攀枝花MS6.1地震序列发震层深度以及震源区及其周围应力特征进行了研究.利用近震深度震相sPL测定了24个3级以上攀枝花地震序列的震源深度,并使用近震波形反演方法测定震源区周围232个地震震源深度.主震的震源深度~12km,... 详细信息

对2008年8月30日攀枝花MS6.1地震序列发震层深度以及震源区及其周围应力特征进行了研究.利用近震深度震相sPL测定了24个3级以上攀枝花地震序列的震源深度,并使用近震波形反演方法测定震源区周围232个地震震源深度.主震的震源深度~12km,大多数3级以上余震分布在12~18km深度范围,发生在脆性上地壳.使用面波和体波三分量波形拟合方法分析了攀枝花地震序列震源区周缘3.0级以上地震,共得到232个可靠的震源机制解,其结果显示震源区以走滑型地震为主,但在块体交界带的局部地区震源机制表现出多样复杂性.在震源区开展基于震源机制解的二维构造应力场反演,研究结果表明,在震源区所处的滇中块体内部应力分布较为一致,应力性质主要为走滑型,方向SE,与当地GPS地表形变速度场方向基本吻合.而滇中块体边界以及块体外部地区,应力性质和应力方向与块体内部存在一定差异.整个研究区域从NE到SW,无论是最大主压应力方向还是最小主压应力方向都存在顺时针方向的偏转.研究结果表明,研究区构造应力场主要受控于青藏高原物质东移受阻而转向南移动,导致滇中次级块体向SE方向平移和顺时针转动.攀枝花地震受SE向水平挤压、NE向水平拉张作用,在~12km深部发生破裂,做走滑运动.

关键词： 2008年攀枝花地震序列深度震相震源机制解构造应力场

Shape and distribution of pores in SiC ceramic membrane supports formed by extrusion molding

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Shape and distribution of pores in SiC ceramic membrane supp...

Simulation and experimental study on drag reduction and anti-adhesion of subsoiler with bionic surface

TEIM2015第六届无机材料结构、性能及测试表征技术研讨会

作者： K.Q.Liu Z.y.luo F.Kang B.J.Wang F.Gao y.F.Liu 北京钢铁研究总院

The SiC ceramic membrane supports by using four different recipes were prepared by extrusion molding ***'shape and distribution of SiC ceramic membrane supports were observed by SEM,meanwhile the O-ring strength was *** analyzing the relationship between pores'shape,distribution and O-rings strength,the optimal data of apparent porosity and the optimal pores'shape and distribution was *** means of using similar particle sizes,particles modification,controlling drying rate of the green body and controlling the contents of glass phase in matrix between SiC particles formed at the high temperature,the SiC ceramic membrane supports with the O-ring strength greater than20 MPa can be prepared.

关键词： SiC Shape and distribution of pores in SiC ceramic membrane supports formed by extrusion molding

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International Journal of Agricultural and Biological Engineering 2022年第4期15卷 57-64页

作者： Jiping Niu Tongyun luo Jiaqing Xie Haoxuan Cai Zhikang Zhou Jun Chen Shuo Zhang College of Water Resources and Architectural Engineering Northwest A&F UniversityYangling 712100ShaanxiChina College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100ShaanxiChina

A new subsoiler with placoid scale microstructure bionic surface was proposed which mimicked shark skin to reduce tillage resistance and soil adhesion during subsoiling *** contour curves of placoid scale microstructure on shark skin were fitted,and two kinds of bionic subsoiler with continuous and discontinuous microstructures were designed and fabricated,*** effects of different bionic surfaces on tillage resistance were investigated by finite element simulation and *** results indicated that the bionic subsoiler with discontinuous microstructure reduced the horizontal and vertical force by 21.3%and 24.8%,*** subsoiler with discontinuous microstructure surface can prevent the adhesion between the soil and subsoiler surface more efficiently.

关键词： drag reduction anti-adhesion subsoiler bionic surface placoid scale microstructure finite element simulation

A functional cathode sodium compensation agent for stable sodium-ion batteries

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Green Energy & Environment 2025年第1期10卷 173-182页

作者： Wei Wu Zhenglin Hu Zhengfei Zhao Aoxuan Wang Jiayan luo Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Shanghai Jiao Tong University Shaoxing Research Institute of Renewable Energy and Molecular Engineering Shaoxing312000China

Hard carbon(HC)is widely used in sodium-ion batteries(SIBs),but its performance has always been limited by lowinitial Coulombic efficiency(ICE)and cycling *** compensation agent is a favorable strategy to make up for the loss of active sodium ions consumed *** it lacks agent that effectively decomposes to increase the active sodium ions as well as regulate carbon defects for decreasing the irreversible sodium ions ***,we propose 1,2-dihydroxybenzene Na salt(NaDB)as a cathode compensation agent with high specific capacity(347.9 mAh g^(-1)),lower desodiation potential(2.4–2.8 V)and high utilization(99%).Meanwhile,its byproduct could functionalize HC with more C]O groups and promote its reversible ***,the presodiation hard carbon(pHC)anode exhibits highly reversible capacity of 204.7 mAh g^(-1) with 98%retention at 5 C rate over 1000 ***,with 5 wt%NaDB initially coated on the Na3V2(PO4)3(NVP)cathode,the capacity retention of NVP t NaDBjHC cell could increase from 22%to 89%after 1000 cycles at 1 C *** work provides a new avenue to improve reversible capacity and cycling performance of SIBs through designing functional cathode compensation agent.

关键词： Hard carbon ICE Cathode compensation agent Reversible capacity Stability

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利用三维地震资料进行边缘检测和地层分析

国外地质勘探技术 1997年第4期 7-10页

作者： y.luo 傅文敏

前言 'The Leading Edge'和AAPG杂志在1995年晚些时候发表了Amoco公司的相关体技术,进行断层检测和地层分析,已经在地震属性用于地震边缘检测方面产生很大的兴趣(Bahorich和Fsrmer,1995),Chevron公司也在过去3年中一直进行类似的但却不... 详细信息

前言 'The Leading Edge'和AAPG杂志在1995年晚些时候发表了Amoco公司的相关体技术,进行断层检测和地层分析,已经在地震属性用于地震边缘检测方面产生很大的兴趣(Bahorich和Fsrmer,1995),Chevron公司也在过去3年中一直进行类似的但却不同的技术研究,尝试使地震边缘检测成为勘探和开发过程的一部分。本文描述处理地震资料的差分方法。

关键词：地震数据边缘检测地层分析地震勘探