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Constitutive modelling of concrete material subjected to low-velocity projectile impact:insights into damage mechanism and target resistance

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第2期25卷 161-182页

作者： Shen LIU Xieping huang Xiangzhen KONG qin FANG Center for Hypergravity Experiment and Interdisciplinary Research Zhejiang UniversityHangzhou310058China Institute of Geotechnical Engineering Zhejiang UniversityHangzhou310058China State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing210007China

This paper presents a numerical study to improve the understanding of the complex subject of penetration and perforation of concrete targets impacted by low-velocity *** main focus is on the damage mechanisms and the major factors that account for the target resistance of the *** improved continuous surface cap model recently proposed was *** model was first equipped with element erosion criteria and was adequately validated by comparisons with ballistic *** numerical simulations were carried out where the individual influence of tensile,shear,and volumetric behaviors(pore collapse)of a concrete target on its ballistic performance was *** demonstrated that cratering on the front face and scabbing on the rear face of the concrete target were mainly dominated by its tensile *** major target resistance came from the second tunneling stage which was primarily governed by the shear and volumetric behaviors of the ***,this study captured the pore collapse-induced damage phenomenon during the high-pressure tunneling stage,which has been extensively reported in experiments but has usually been neglected in previous numerical investigations.

关键词： Penetration Perforation Damage mechanism Target resistance Projectile impact Pore collapse

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汽车门内饰板设计及强度分析

汽车实用技术 2024年第12期49卷 35-38,56页

作者：刘云芳俞大象王章生黄勤江铃汽车股份有限公司产品研发总院江西南昌330001 南昌工学院江西南昌330108

汽车门内饰板是汽车内饰重要的组成部分,其设计的好坏关系到车型开发能否成功。文章重点针对地图袋的设计、门饰板的安装、门饰板内扣手与门饰板的匹配关系以及扬声器罩盖的设计进行探讨,目的是为后续车型门内饰板的设计开发提供参考。... 详细信息

汽车门内饰板是汽车内饰重要的组成部分,其设计的好坏关系到车型开发能否成功。文章重点针对地图袋的设计、门饰板的安装、门饰板内扣手与门饰板的匹配关系以及扬声器罩盖的设计进行探讨,目的是为后续车型门内饰板的设计开发提供参考。在样件试制过程中,为验证设计的合理性,门内饰板需通过相应物理实验验证设计的鲁棒性。针对门饰板扶手的使用工况,利用常用的有限元分析软件HyperMesh和ABAQUS对门内饰板扶手进行强度分析,分析计算其在220N的垂直载荷作用下的应力值。结果表明,此门内饰板的应力小于材料的屈服强度,符合公司规范要求。

关键词：门内饰板地图袋有限元分析强度

基于文本挖掘的高校网络舆情研究热点及趋势分析

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宜春学院学报 2024年第1期46卷 24-31页

作者：黄钦杨芳朱礼龙张秀娟巢湖学院马克思主义学院安徽合肥238000 巢湖学院工商管理学院安徽合肥238000

为系统分析国内高校网络舆情研究热点及研究趋势,采用共现分析、LDA主题模型等文本挖掘方法对国内高校网络舆情研究的学术论文进行分析。从宏观和微观两个层面展开分析,宏观层面以关键词共现网络为基础,利用社区挖掘方法抽取关键词语义... 详细信息

为系统分析国内高校网络舆情研究热点及研究趋势,采用共现分析、LDA主题模型等文本挖掘方法对国内高校网络舆情研究的学术论文进行分析。从宏观和微观两个层面展开分析,宏观层面以关键词共现网络为基础,利用社区挖掘方法抽取关键词语义社区,分析高校网络舆情主要研究内容;微观层面以学术论文摘要语料库为基础,利用LDA主题模型抽取潜在研究主题,度量主题强度及其演化趋势,发现当前研究热点。研究结果发现当前国内高校网络舆情有6大热点研究主题,其中高校网络舆情引导、监测和演化分析的研究热度将持续增强。最后对高校网络舆情研究进行展望,提出未来研究方向和研究问题。

关键词：高校网络舆情文本挖掘共现分析主题模型研究热点

Effect of Iron on the Stability of Rhodochrosite at the Topmost Lower Mantle Conditions

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Journal of Earth Science 2024年第2期35卷 504-513页

作者： Tianlei Zhai Fei qin Shengxuan huang Shan qin Yu Gong Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of EducationSchool of Earth and Space SciencesPeking UniversityBeijing100871China School of Earth Sciences and Resources China University of GeosciencesBeijing100083China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China

Carbonates are viewed as the principal oxidized carbon carriers during subduction,and thus the stability of subducted carbonates has significant implications for the deep carbon *** we investigate the high pressure-temperature behaviors of rhodochrosite in the presence of iron up to∼34 GPa by in-situ X-ray diffraction and ex-situ Raman *** relatively low temperature below∼1500 K,MnCO_(3)breaks down into MnO and CO_(2).Upon heating to∼1800 K,however,the MnCO_(3)-Fe^(0)reactions occur with the formation of Mn_(3)O_(4),Fe^(O)and reduced carbon.A'three-stage'reaction mechanism is proposed to understand the kinetics of the carbon-iron-manganese redox *** results suggest that Fe^(0)can serve as a reductant to greatly affect the stability of rhodochrosite,which implies that the effect of Fe-metal should be seriously considered for the high pressure-temperature behaviors of other predominant carbonates at Earth's mantle conditions,particularly at depths greater than∼250 km.

关键词： deep carbon cycle rhodochrosite reduced mantle diamond formation high pressure tectonics geochemistry

羊粪生物炭强化CRI系统厌氧氨氧化脱氮性能研究

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成都工业学院学报 2024年第4期27卷 7-14页

作者：陈佼黄琴李舒昕唐艺闫思羽黄雯陆一新成都工业学院材料与环境工程学院成都611730 西南交通大学地球科学与工程学院成都611756

为提高人工快渗(CRI)系统的脱氮效率,制备羊粪生物炭(SMB)并考察了其对CRI系统厌氧氨氧化启动过程中氮转化效率的影响,结合生物炭表征、生物膜特性和菌群结构变化解析了SMB强化厌氧氨氧化脱氮性能的机理。结果表明,在CRI系统滤料层添加... 详细信息

为提高人工快渗(CRI)系统的脱氮效率,制备羊粪生物炭(SMB)并考察了其对CRI系统厌氧氨氧化启动过程中氮转化效率的影响,结合生物炭表征、生物膜特性和菌群结构变化解析了SMB强化厌氧氨氧化脱氮性能的机理。结果表明,在CRI系统滤料层添加质量分数为20%的SMB,可在运行43 d后成功启动厌氧氨氧化,总氮(TN)去除率达到94.6%,其启动时间比未添加SMB时缩短了25.9%,脱氮效率比未添加SMB时提高了8.3个百分点。SMB的添加可为CRI系统内微生物提供更优质的载体条件,刺激胞外聚合物的分泌,形成更稳定的生物膜结构,比厌氧氨氧化活性比未添加SMB时提高了20.3%。添加SMB后,CRI系统内厌氧氨氧化菌属Candidatus_Brocadia的相对丰度增长到26.25%,同时Denitratisoma、Thauera、Flavobacterium等反硝化菌群协同共存于体系内,促使系统在更短的启动时间内获得更高的TN去除效果,强化其厌氧氨氧化脱氮性能。

关键词：羊粪生物炭厌氧氨氧化脱氮人工快渗系统强化

基于转录组学数据探讨针刺“足三里”或“内关”改善溃疡性结肠炎的腧穴功效差异

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世界科学技术-中医药现代化 2024年第1期26卷 119-128页

作者：董龙聪张瑞斌沈缘李虹莹黄琴余曙光吴巧凤成都中医药大学针灸推拿学院成都610075

目的观察针刺“足三里”或“内关”对溃疡性结肠炎(Ulcerative colitis,UC)模型小鼠的干预效应,并利用转录组学分析病变组织结肠和非病变组织心脏在接受针刺干预后基因转录表达的异同之处,以期探讨两个腧穴是否存在功效差异。方法硫酸... 详细信息

目的观察针刺“足三里”或“内关”对溃疡性结肠炎(Ulcerative colitis,UC)模型小鼠的干预效应,并利用转录组学分析病变组织结肠和非病变组织心脏在接受针刺干预后基因转录表达的异同之处,以期探讨两个腧穴是否存在功效差异。方法硫酸葡聚糖钠盐(Dextran sulfate sodium salt,DSS)诱导法建立UC小鼠模型,造模成功后,小鼠被随机分为模型组,足三里组及内关组,每组9只。足三里组及内关组分别于“足三里”、“内关”进行针刺干预,每次30 min,每天1次,连续干预5天,空白组和模型组只捆绑不针刺。观察各组小鼠的一般情况,计算疾病活动指数(Disease activity index,DAI),通过HE染色观察结肠组织形态变化,并利用转录组测序技术,分别对各组小鼠的结肠组织进行测序和生物学分析,从病变组织角度比较研究两个穴位是否存在腧穴功效差异。同时取各组心脏组织进行比较分析,从非病变组织角度探讨两个穴位的效应是否存在差异。结果与空白组相比,模型组DAI评分显著升高(P<0.001),HE染色结果显示伴有明显病理损伤;针刺足三里或内关后,UC小鼠的DAI评分均显著降低(P<0.05),病理损伤明显改善。转录组测序及生物信息学分析结果显示,针刺足三里或内关对病变部位结肠组织的影响涉及多个基因,相似变化的差异基因(co-DEGs)有825个,主要富集到白细胞及趋化因子等通路;只受足三里影响的差异基因(ST36only-DEGs)有168个,富集到胃酸分泌等通路;只受内关影响的差异基因(PC6 only-DEGs)有325个,富集到细胞因子-细胞因子受体相互作用等通路。非病变组织心脏中co-DEGs为95个,主要富集到防御反应的正向调节、对白细胞介素-1的反应等通路;ST36 only-DEGs为28个;PC6 only-DEGs为114个,富集到心血管疾病等通路。结论针刺“足三里”与“内关”均能改善UC小鼠的症状和结肠病理变化。但通过转录组学分析发现,两个穴位对病变部位结肠组织和非病变部位心脏组织的基因转录影响存在一定差异,提示分布部位不同的腧穴在宏观功效上有一定共性,但在微观层面上,存在一定的差异性。

关键词：腧穴转录组学生物信息学溃疡性结肠炎

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不同处理对2种绿绒蒿种子萌发特性的影响

四川林业科技 2024年第2期45卷 135-140页

作者：黄琴牟皓贺丽陈春桦潘红丽黄文军王鑫四川省林业科学研究院四川成都610081

对比不同GA_(3)浓度、GA_(3)不同浸泡时间、不同温度和不同光照处理对全缘叶绿绒蒿和总状绿绒蒿种子萌发的影响,寻找出最有利于这两种绿绒蒿种子萌发的方法。结果表明:(1)100 mg·L^(-1)GA_(3)处理最能促进全缘叶绿绒蒿种子萌发,总状绿... 详细信息

对比不同GA_(3)浓度、GA_(3)不同浸泡时间、不同温度和不同光照处理对全缘叶绿绒蒿和总状绿绒蒿种子萌发的影响,寻找出最有利于这两种绿绒蒿种子萌发的方法。结果表明:(1)100 mg·L^(-1)GA_(3)处理最能促进全缘叶绿绒蒿种子萌发,总状绿绒蒿用300 mg·L^(-1) GA_(3)处理最优,其次为200 mg·L^(-1) GA_(3)处理。(2)而12 h处理和18 h处理为不同GA_(3)处理时间对总状绿绒蒿种子萌发中最优的两个处理;全缘叶绿绒蒿种子GA_(3)三个处理均优于对照。(3)25℃处理与25℃/15℃处理最能促进全缘叶绿绒蒿种子萌发,25℃处理最能促进总状绿绒蒿种子萌发。(4)12 h光照/12 h黑暗交替处理均最能促进全缘叶绿绒蒿种子和总状绿绒蒿种子萌发。

关键词：全缘叶绿绒蒿总状绿绒蒿种子萌发 GA3

Effect of hydraulic fracture deformation hysteresis on CO_(2)huff-n-puff performance in shale gas reservoirs

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第1期24卷 37-55页

作者： Xia YAN Pi-yang LIU Zhao-qin huang Hai SUN Kai ZHANG Jun-feng WANG Jun YAO School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China Civil Engineering School Qingdao University of TechnologyQingdao 266520China Chuandong Drilling Company CNPC Chuanqing Drilling Engineering Company LimitedChongqing 401120China

As a promising enhanced gas recovery technique,CO_(2)huff-n-puff has attracted great attention ***,hydraulic fracture deformation hysteresis is rarely considered,and its effect on CO_(2)huff-n-puff performance is not well *** this study,we present a fully coupled multi-component flow and geomechanics model for simulating CO_(2)huff-n-puff in shale gas reservoirs considering hydraulic fracture deformation ***,a shale gas reservoir after hydraulic fracturing is modeled using an efficient hybrid model incorporating an embedded discrete fracture model(EDFM),multiple porosity model,and single porosity *** flow equations,Fick’s law,extended Langmuir isotherms,and the Peng-Robinson equation of state are used to describe the molecular diffusion,multi-component adsorption,and gas properties,*** relation to geomechanics,a path-dependent constitutive law is applied for the hydraulic fracture deformation *** finite volume method(FVM)and the stabilized extended finite element method(XFEM)are applied to discretize the flow and geomechanics equations,*** then solve the coupled model using the fixed-stress split iterative ***,we verify the presented method using several numerical examples,and apply it to investigate the effect of hydraulic fracture deformation hysteresis on CO_(2)huff-n-puff performance in a 3D shale gas *** results show that hydraulic fracture deformation hysteresis has some negative effects on CO_(2)huff-n-puff *** effects are sensitive to the initial conductivity of hydraulic fracture,production pressure,starting time of huff-n-puff,injection pressure,and huff-n-puff cycle number.

关键词： Enhanced gas recovery CO_(2)huff-n-puff Coupled geomechanics and multi-component flow Hydraulic fracture deformation hysteresis Embedded discrete fracture model(EDFM)

Intravenous leiomyoma of the uterus extending to the pulmonary artery:A case report

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世界临床病例杂志 2023年第24期11卷 5729-5735页

作者： Yuan-qin huang Qi Wang Dou-Dou Xiang Quan Gan Department of Intensive Care Unit Maternal and Child Health Hospital of Hubei ProvinceWuhan 430070Hubei ProvinceChina Division of Gastroenterology and Hepatology Renji HospitalSchool of MedicineShanghai Jiao-Tong UniversityShanghai Institute of Digestive DiseaseShanghai 200127China Department of Pathology Maternal and Child Health Hospital of Hubei ProvinceWuhan 430070Hubei ProvinceChina

BACKGROUND Uterine intravenous leiomyomatosis is defined as leiomyoma tissue invading the vein outside the *** of extension to the right pulmonary artery are relatively *** SUMMARY We describe a 31-year-old woman with a benign leiomyoma that extended into the right ventricular lumen,causing mechanical obstruction and corresponding clinical *** located in the pulmonary artery can cause pulmonary artery *** diagnosis,surgical treatment should be performed as soon as *** In this case,the uterine leiomyoma extended to the right pulmonary system,which is clinically rare.

关键词： Pulmonary arteriovenous disease Hysteromyoma Cardiac surgery Case report