检索结果-南通市图书馆

Effect of High Content Limestone Powder on Microstructure and Mechanical Properties of Cement-based Materials

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2023年第3期38卷 557-566页

作者：陈梦梦何永佳吕林女 zhang xulong State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhan 430070China Hubei Provincial Academy of Building Research and Design Co. LtdWuhan 430071China

Compared with the control sample without limestone powder(LP), the mechanical properties of the sample with 30% LP can be significantly improved by using a small amount of water reducer to reduce the water-cement ratio, without significantly affecting the fluidity of the fresh mixture and increasing the economic cost. In addition, compared with the sole addition of limestone powder, dual addition of metakaolin and limestone powder can effectively improve the strengths. The reason of this phenomenon was investigated by means of XRD, TG-DTG, SEM, LF-NMR and isothermal calorimetry, etc. The reactive aluminum-rich phases in metakaolin react with limestone powder in the hydration process, and the formed calcium carboaluminate reduces the porosity and makes the hardened paste denser. The addition of ground granulated blast furnace slag can also improve the strength of the specimen added with limestone powder, whereas, the effect is inferior to that of metakaolin, for the ground granulated blast furnace slag contains less reactive aluminate phases, and accordingly, the amount of calcium carboaluminate generated is lower than that of metakaolin.

关键词： limestone powder aluminum-rich phase mineral admixture calcium carboaluminate

Effects of Steam Curing on the Resistance of Cementitious Materials to Chloride Penetration

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2022年第5期37卷 885-891页

作者： CHEN Xuefei HE Yongjia Lü Linnü zhang xulong HU Shuguang State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan430070China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhan430070China Hubei Provincial Academy of Building Research and Design Co. LtdWuhan430071China

The resistance to chloride penetration of cement-based material with different curing regimes was investigated by solution titration,XRD,LF-NMR and rapid chloride migration *** results show that the curing regime has influences on the types and structure of the hydration products,which in turn affects their ability to bind chloride *** binding capacity of cementitious materials to chloride ions,porosity and chloride ion migration coefficient increased with the increase of water-cement ratio,while steam curing increased the porosity and chloride ion migration coefficient at the same time as it increased the chloride ion binding capacity of the *** lower water-cement ratios,the effect of steam curing on the resistance of cementitious materials to chloride ingress is negligible.

关键词： chloride penetration chloride binding capacity pore structure steam curing cementitious materials

Fault Tolerant Control Method for Three-Level Photovoltaic Inverter Based on Redundant Voltage Space Vector 36

在线全文

学校读者我要写书评

暂无评论

Fault Tolerant Control Method for Three-Level Photovoltaic I...

Ficolin A exacerbates severe H1N1 influenza virus infection-induced acute lung immunopathological injury via excessive complement activation

第36届中国控制会议

作者： xulong zhang Feng Wang Wen Ji Shuyun Qiao Yanjing Cao Department of Information and Electrical Engineering Xuzhou University of Technology

ISBN: (纸本)9781538629185

Power devices short circuit or open circuit fault can have serious impact on the reliability of the photovoltaic inverter system during the operational *** the basis of analysis of the fault characteristics and types with neutral point clamped three-level photovoltaic inverter as the research object,fault diagnosis logic is *** tolerant control strategy for three-level photovoltaic inverter based on redundant space vectors is *** changes of photovoltaic inverter space vector are analyzed before and after the fault occurs,photovoltaic inverter will maintain fault-tolerant operation by utilizing the redundant voltage space *** and experiment verify the feasibility and effectiveness of the proposed fault tolerant control method and the proposed method has a good fault tolerant performance.

关键词： Photovoltaic inverter fault tolerant control three-level redundant voltage space vector

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2021年第9期18卷 2278-2280页

作者： Xu Wu Linlin Bao Ziqi Hu Duoduo Yao Fengdi Li Hui Li Xiaoxue Xu Yunqing An Xi Wang Bin Cao xulong zhang Department of Immunology School of Basic Medical SciencesCapital Medical UniversityBeijingChina Department of Respiratory Medicine Hunan Provincial People’s Hospital(The First Affiliated Hospital of Hunan Normal University)ChangshaChina NHC Key Laboratory of Human Disease Comparative Medicine(The Institute of Laboratory Animal Sciences CAMS&PUMC)Beijing Key Laboratory for Animal Models of Emerging and Reemerging InfectionBeijingChina China-Japan Friendship Hospital National Clinical Research Center for Respiratory DiseasesClinical Center for Pulmonary InfectionsCapital Medical UniversityBeijingChina Department of Core Facility Center Capital Medical UniversityBeijingChina Institute of Respiratory Medicine Chinese Academy of Medical SciencesPeking Union Medical CollegeBeijingChina Tsinghua UniversityPeking University Joint Center for Life Sciences BeijingChina

Severe pandemic influenza A(H1N1)2009 virus(pH1N1)infection causes significant morbidity and *** and other groups have reported that immunopathological damage induced by excessive pulmonary inflammation plays a critical role in the pathogenesis of severe pneumonia and provides novel strategies for the treatment of severe influenza infection[1–3].The complement system plays critical roles in both innate and adaptive immunity by activating the classical,alternative and lectin pathways[4].

关键词： influenza infection immunity

A Novel Optimization Scheme for Named Entity Recognition with Pre-trained Language Models

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronic Research and Application 2024年第5期8卷 125-133页

作者： Shuanglong Li xulong zhang Jianzong Wang Shenzhen University Shenzhen 518000Guangdong ProvinceChina Ping An Technology(Shenzhen)Co. Ltd.Shenzhen 518000Guangdong ProvinceChina

Named Entity Recognition(NER)is crucial for extracting structured information from *** traditional methods rely on rules,Conditional Random Fields(CRFs),or deep learning,the advent of large-scale Pre-trained Language Models(PLMs)offers new *** excel at contextual learning,potentially simplifying many natural language processing ***,their application to NER remains *** paper investigates leveraging the GPT-3 PLM for NER without *** propose a novel scheme that utilizes carefully crafted templates and context examples selected based on semantic *** experimental results demonstrate the feasibility of this approach,suggesting a promising direction for harnessing PLMs in NER.

关键词： GPT-3 Named Entity Recognition Sentence-BERT model In-context example

γδT cells aggravate severe H1N1 influenza virus infection induced acute lung injury via secreting IL-17A

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

γδT cells aggravate severe H1N1 influenza virus infection ...

深松对乌拉尔甘草根际土壤养分以及微生物群落功能多样性的影响

第十二届全国免疫学学术大会

作者： zhang xulong Xue Chunxue Wen Mingjie Bao Linlin Cao Bin Department of Immunology School of Basic Medical SciencesCapital Medical University Department of Respiratory and Critical Care Medicine Beijing Luhe HospitalCapital Medical University Institute of Laboratory Animal Sciences Chinese Academy of Medical Sciences Department of Pulmonary and Critical Care Medicine China-Japan Friendship Hospital

Background:The influenza A(H1N1) pdm09 virus remains a critical global health concern and causes high levels of morbidity and *** acute lung injury(ALI) and acute respiratory distress syndrome(ARDS) are the major outcomes among severely infected ***:Our previous study found that interleukin(IL)-17A production by humans or mice infected with influenza A(H1N1) pdm09 substantially contributes to ALI and subsequent morbidity and ***,the cell types responsible for IL-17A production during the early stage of severe influenza A(H1N1)pdm09 infection remained ***:In this study,a mouse model of severe influenza A(H1N1) pdm09 infection was *** the lungs of infected mice,the percentage of γδT cells,but not the percentages of CD4Th and CD8Tc cells,gradually increased and peaked at 3 days post infection(dpi).Further analysis revealed that the Vγ4γδT subset,but not the Vγ1γδT subset,was significantly increased among the γδT *** 3 dpi,the virus induced significant increases in IL-17A in the bronchoalveolar lavage fluid(BALF) and ***-17A was predominantly secreted by γδT cells(especially the Vγ4γδT subset),but not CD4Th and CD8Tc cells at the early stage of infection,and IL-1β and/or IL-23 were sufficient to induce IL-17A production by γδT *** of γδT cells or the Vγ4γδT subset significantly rescued the virus-induced weight loss and improved the survival rate by decreasing IL-17A secretion and reducing immunopathological ***:This study demonstrated that,by secreting IL-17A,lung Vγ4γδT cells,at least,in part mediated influenza A(H1N1) pdm09-induced immunopathological *** mechanism might serve as a promising new target for the prevention and treatment of ALI induced by influenza A(H1N1) pdm09.

关键词： Influenza γδT cells IL-17A acute pulmonary immunopathological injury

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

生态学报 2017年第15期37卷 5137-5145页

作者：张志政马淼张旭龙石河子大学生命科学学院石河子832003

通过大田试验和室内分析相结合,研究了深松对乌拉尔甘草根际土壤养分和微生物群落功能多样性的影响,以期为乌拉尔甘草人工种植地土壤耕作措施优化和土壤环境改良提供依据。结果表明,与未深松(常规耕作)处理相比,深松处理对乌拉尔甘草根... 详细信息

通过大田试验和室内分析相结合,研究了深松对乌拉尔甘草根际土壤养分和微生物群落功能多样性的影响,以期为乌拉尔甘草人工种植地土壤耕作措施优化和土壤环境改良提供依据。结果表明,与未深松(常规耕作)处理相比,深松处理对乌拉尔甘草根际土壤0—20 cm耕层土壤养分含量无显著性影响,可显著提高乌拉尔甘草根际土壤20—40 cm耕层有机质、全氮、全磷和全钾的含量,分别提高了60.8%、65.3%、48.9%和86.8%;明显增加了0—20 cm和20—40 cm耕层细菌、真菌和放线菌的数量(P<0.05),3种类型的微生物数量均呈现出上层大于下层,深松大于未深松的变化趋势。在156 h的微生物温育期内,深松处理下不同土层的平均颜色变化率(AWCD)均显著高于未深松处理,并显著提高了AWCD的利用率(72 h,P<0.05),较未深松分别提高了35.5%和130.8%。与未深松处理相比,深松处理显著提高了土壤微生物的多样性指数(H、S、D)。主成分分析(PCA)表明,深松优化了乌拉尔甘草根际土壤微生物的群落组成;聚合物、羧酸类化合物、氨基酸和碳水化合物是深松处理下根际土壤微生物利用的主要碳源。总而言之,深松处理显著提高乌拉尔甘草根际土壤养分含量、微生物数量和微生物多样性指数,改变了微生物群落功能多样性,造成这种差异的主要原因可能是深松改变了土壤耕层结构,改善了微生物的生存环境。因此,深松对乌拉尔甘草人工种植地土壤质量的改良有积极作用。

关键词：深松乌拉尔甘草土壤理化性质土壤微生物 Biolog

平行双裂缝圆盘试样裂纹扩展过程的尺寸效应试验研究

在线全文

学校读者我要写书评

暂无评论

岩石力学与工程学报 2023年第1期42卷 115-128页

作者：张旭龙张盛安定超陈召王峥河南理工大学能源科学与工程学院河南焦作454001 煤炭安全生产与清洁高效利用省部共建协同创新中心河南焦作454001

针对含多条裂缝不同尺寸的岩石受载时内部裂纹扩展及贯通存在尺寸效应的问题,制作了直径分别为50,100,150和200 mm的平行双裂缝砂岩圆盘试样,其厚度、裂缝长度和裂缝间距随直径等比变化。在GCTS RTX–3000试验机上对圆盘试样进行静态加... 详细信息

针对含多条裂缝不同尺寸的岩石受载时内部裂纹扩展及贯通存在尺寸效应的问题,制作了直径分别为50,100,150和200 mm的平行双裂缝砂岩圆盘试样,其厚度、裂缝长度和裂缝间距随直径等比变化。在GCTS RTX–3000试验机上对圆盘试样进行静态加载试验,采用声发射(acoustic emission,AE)和数字图像相关(digital image correlation,DIC)技术对试样的裂纹扩展过程进行监测。结果表明:随试样尺寸的增加,破坏载荷呈线性增长趋势,预制裂缝对试样承载能力的削弱作用增强,试样破坏单位体积消耗的能量逐渐减小;多裂纹扩展存在相互竞争机制,裂纹的起裂顺序决定着扩展方向,直径50,100和200 mm的试样裂纹扩展具有同方向性,直径150 mm的试样裂纹相向扩展;通过AE准确反映了试样内部的损伤演化过程,运用DIC技术将裂纹扩展过程数值化,能够精确分析裂纹的张开位移和扩展速度;不同尺寸试样裂纹扩展速度的变化规律相似,即裂纹以一个较低的初速度开始扩展,并在很短的距离内达到峰值速度,之后扩展速度急剧下降,末段裂纹扩展速度缓慢减小并趋于稳定。

关键词：岩石力学平行双裂缝损伤演化数字图像相关法裂纹扩展速度尺寸效应

考虑空间–时间域影响的岩石动态断裂韧度尺寸效应研究

在线全文

学校读者我要写书评

暂无评论

岩石力学与工程学报 2022年第10期41卷 1981-1992页

作者：张盛安定超张旭龙陈召王峥河南理工大学能源科学与工程学院河南焦作454001 煤炭安全生产与清洁高效利用省部共建协同创新中心河南焦作454001

为探究岩石动态断裂韧度的尺寸效应,采用直径分别为50,100,150,205 mm的中心直裂纹圆盘砂岩试样在分离式霍普金森压杆系统进行动态劈裂加载试验,分析不同尺寸试样动态断裂韧度测试值随尺寸变化的规律。通过虚拟裂纹模型、理论解析,结合... 详细信息

为探究岩石动态断裂韧度的尺寸效应,采用直径分别为50,100,150,205 mm的中心直裂纹圆盘砂岩试样在分离式霍普金森压杆系统进行动态劈裂加载试验,分析不同尺寸试样动态断裂韧度测试值随尺寸变化的规律。通过虚拟裂纹模型、理论解析,结合动态有限元,确定不同尺寸试样的断裂过程区长度、孕育时间、断裂能,提出了考虑断裂过程区的空间(断裂过程区长度)–时间(断裂过程区孕育时间)域影响的岩石动态断裂韧度确定方法。同时,利用数字图像相关方法实时监测试样表面,探究试样的破坏过程。结果表明:在试样尺寸范围内,岩石断裂韧度测试值随尺寸增加而增加,表现出明显的尺寸效应;断裂过程区长度、孕育时间随试样尺寸增加而增加,意味着贡献的储存能量随尺寸增加,这与断裂能的尺寸效应相一致,间接说明断裂韧度产生尺寸效应的原因;考虑断裂过程区空间–时间域影响,在一定程度上减小了较大尺寸试样(直径150 mm、直径205 mm)断裂韧度的尺寸效应,从整体尺寸上消除尺寸效应的方法还需进一步探究;试样裂纹扩展方向由预制裂纹裂尖向加载端进行,并在加载端形成楔形破坏区。

关键词：岩石力学断裂过程区孕育时间动态断裂韧度尺寸效应虚拟裂纹