检索结果-南通市图书馆

Microdynamic mechanical properties and fracture evolution mechanism of monzogabbro with a true triaxial multilevel disturbance method

引用

International Journal of Mining Science and Technology 2024年第3期34卷 385-411页

作者： Zhi Zheng Bin Deng Hong Liu Wei Wang shuling huang Shaojun Li State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Key Laboratory of Disaster Prevention and Structural Safety of Ministry of EducationCollege of Civil Engineering and ArchitectureGuangxi UniversityNanning 530004China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources Changjiang River Scientific Research InstituteWuhan 430015China

The far-field microdynamic disturbance caused by the excavation of deep mineral resources and underground engineering can induce surrounding rock damage in high-stress conditions and even lead to ***,the mechanical properties and damage/fracture evolution mechanisms of deep rock induced by microdynamic disturbance under three-dimensional stress states are ***,a true triaxial multilevel disturbance test method is proposed,which can completely simulate natural geostress,excavation stress redistribution(such as stress unloading,concentration and rotation),and subsequently the microdynamic disturbance triggering damaged rock *** on a dynamic true triaxial test platform,true triaxial microdynamic disturbance tests under different frequency and amplitudes were carried out on *** results show that increasing amplitude or decreasing frequency diminishes the failure strength of *** modulus gradually decreases during disturbance *** frequency and amplitude increase,the degradation rate of deformation modulus decreases slightly,disturbance dissipated energy increases significantly,and disturbance deformation anisotropy strengthens obviously.A damage model has been proposed to quantitatively characterize the disturbance-induced damage evolution at different frequency and amplitude under true triaxial *** disturbance failure,the micro-tensile crack mechanism is dominant,and the micro-shear crack mechanism increases significantly at *** the increase of amplitude and frequency,the micro-shear crack mechanism *** approaching disturbance failure,the acoustic emission fractal dimension changes from a stable value to local large oscillation,and finally increases sharply to a high value at ***,the disturbance-induced failure mechanism of surrounding rock in deep engineering is clearly elucidated.

关键词： True triaxial disturbance test Mechanical properties Fracture evolution mechanism Disturbance-induced damage evolution Failure mechanism and precursor

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Investigation of anisotropic strength criteria for layered rock mass

引用

Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1289-1304页

作者： shuling huang Jinxin Zhang Xiuli Ding Chuanqing Zhang Gang Han Guoqi Yu Lulu Qu Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources Changjiang River Scientific Research InstituteWuhan430071China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430000China University of Chinese Academy of Sciences Beijing100049China

Layered rock mass is a type of engineering rock mass with sound mechanical anisotropy,which is generally unfavorable to the stability of underground *** investigate the strength anisotropy of layered rock,the Mohr-Coulomb and Hoek-Brown criteria are introduced to establish the two transverse isotropic strength criteria based on Jaeger's single weak plane theory and maximum axial strain theory,and parameter determination ***,the sensitivity of strength parameters(K 1,K 2,and K 3)that are used to characterize the anisotropy strength of non-sliding failure involved in the strength criteria and confining pressure are *** results demonstrate that strength parameters K 1 and K 2 affect the strength of layered rock samples at all bedding angles except for the bedding angle of 90°and the angle range that can cause the shear sliding failure along the bedding *** strength of samples at any bedding angle decreases with increasing K 1,whereas the opposite is for K *** for bedding angles of 0°and 90°and the bedding angle range that can cause the shear sliding along the bedding plane,K 3 has an impact on the strength of rock samples with other bedding angles that the specimens'strength increases with increase of K *** addition,the strength of the rock sample increases as confining pressure ***,the uniaxial and triaxial tests of chlorite schist samples were carried out to verify and evaluate the strength criteria proposed in the *** shows that the predicted strength is in good agreement with the experimental *** test the applicability of the strength criterion,the strength data of several types of rock in the literature are ***,a comparison is made between the fitting effects of the two strength criteria and other available criteria for layered rocks.

关键词： Layered rock Strength anisotropy Strength criterion Experimental verification

来源：

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

The role of gut microbiota associated metabolites in digestive disorders

引用

Engineered Regeneration 2024年第2期5卷 228-246页

作者： Na Li Cheng Zhao Pingnan Zhang Songting Wu Xiaotan Dou Saifei Xu Xiaoqi Zhang Chunyan Peng Ying Xie shuling huang Lin Zhou Yonghua Shen Lei Wang Jinglin Wang Chenggong Yu Department of Gastroenterology Nanjing Drum Tower HospitalAffiliated Hospital of Medical SchoolNanjing UniversityNanjing210008China Division of Hepatobiliary and Transplantation Surgery Department of Gernal SurgeryNanjing Drum Tower HospitalAffiliated Hospital of Medical SchoolNanjing UniversityNanjing210008China

The gut has been a focal point in the research of digestive system *** internal microbiota generates metabolites that function as signaling molecules and substrates,interacting with the intestinal wall and influ-encing host physiology and ***,the gut microbiota and metabolites owe highly diverse types and quantities,posing challenges for quantitative analysis,and monitoring frequent interactions between diges-tive tract metabolites and the intestinal wall remains a ***,research targeting gut microbiota metabolites has elucidated their relevance to digestive *** modulating metabolites such as short-chain fatty acids,bile acids,and lipopolysaccharides,it is possible to intervene in the progression of diseases such as inflammatory bowel disease and non-alcoholic fatty liver ***,research on gut microbiota is advancing,and more work is required to explore the interactions between host,microbes and underlying *** this review,we have revisited the generation of gut microbiota-related metabolites,their impact on diseases,and modes of interaction,emphasizing the significant role of metabolites in digestive system *** is believed that the linkage between gut microbiota and diseases in current research can be established through metabolites,providing a framework and foundation for research in the field of metabolomics and fundamental mechanisms.

关键词： Gut microbial metabolites Digestive disorders Inflammatory bowel disease(IBD) Non-alcoholic fatty liver disease(NAFLD)

来源：

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

职业院校“工匠型”教师的内涵特征与评价指标

引用

科教文汇 2024年第4期 171-174页

作者：黄淑玲河池市职业教育中心学校广西河池547000

该文旨在探讨职业院校“工匠型”教师的内涵特征与评价指标。认为“工匠型”教师应具备以下内涵特征:(1)专业技能过硬;(2)教学经验丰富;(3)教学方法灵活多样;(4)注重学生实践能力培养;(5)具备深厚的职业道德素养。同时提出了评价“工匠... 详细信息

该文旨在探讨职业院校“工匠型”教师的内涵特征与评价指标。认为“工匠型”教师应具备以下内涵特征:(1)专业技能过硬;(2)教学经验丰富;(3)教学方法灵活多样;(4)注重学生实践能力培养;(5)具备深厚的职业道德素养。同时提出了评价“工匠型”教师的指标体系,包括教学成果、学生评价、同行评价、社会评价四个方面。最后对职业院校“工匠型”教师的培养提出了建议,包括加强教师专业技能培养、提高教师教学经验、鼓励教师创新教学方法、加强学生实践能力培养、加强职业道德教育等。

关键词：职业院校工匠型教师内涵特征评价指标

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

技能大师工作室引领“工匠型”教师技能提升研究——以汽修专业为例

引用

科教导刊 2024年第2期 83-85页

作者：黄淑玲河池市职业教育中心学校广西河池547000

文章以汽修专业为例,探讨技能大师工作室在引领“工匠型”教师技能提升方面的作用。通过对汽修教师职业能力的分析,我们发现汽修教师的专业技能和教学能力是提高教学质量和学生学习效果的关键因素。而技能大师工作室可以为汽修教师提供... 详细信息

文章以汽修专业为例,探讨技能大师工作室在引领“工匠型”教师技能提升方面的作用。通过对汽修教师职业能力的分析,我们发现汽修教师的专业技能和教学能力是提高教学质量和学生学习效果的关键因素。而技能大师工作室可以为汽修教师提供实践操作和交流学习的平台,帮助教师提高自身的技能水平,进而提高教学质量。文章将详细阐述技能大师工作室的具体措施以及实施效果。

关键词：技能大师工作室工匠型教师技能汽修专业

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

中西式养生面点在新时代下的跨界创新与市场应用

引用

食品安全导刊 2024年第27期 156-159页

作者：黄暑玲广东创新科技职业学院广东东莞523962

在全球健康意识增强的背景下,饮食文化的跨界融合与创新成为食品工业的重要发展方向。本文探讨了中西式养生面点在新时代背景下的创新发展与市场应用。通过分析传统中式面点和西式面点的制作工艺与养生理念的异同,本文揭示了养生面点在... 详细信息

在全球健康意识增强的背景下,饮食文化的跨界融合与创新成为食品工业的重要发展方向。本文探讨了中西式养生面点在新时代背景下的创新发展与市场应用。通过分析传统中式面点和西式面点的制作工艺与养生理念的异同,本文揭示了养生面点在当代消费者需求下的创新路径。通过结合中医药食同源的理论和西方营养学的健康饮食理念,本文提出了中西式养生面点的创新模式,并通过案例分析验证了其可行性和市场潜力。研究发现,跨文化的融合与现代技术的应用是中西式养生面点创新的关键驱动力。同时,随着消费者对健康饮食的需求增长,该领域在市场应用中展现出广阔前景。本研究不仅为食品行业提供了理论指导,还为从业者实践操作提供了参考框架。

关键词：中西式养生面点创新市场应用

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hardening-Softening Constitutive Model of Hard Brittle Rocks Considering Dilatant Effects and Safety Evaluation Index

引用

Acta Mechanica Solida Sinica 2020年第1期33卷 121-140页

作者： shuling huang Chuanqing Zhang Xiuli Ding Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources Yangtze River Scientific Research InstituteWuhan 430071HubeiChina State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071HubeiChina University of Chinese Academy of Sciences Beijing 100049China

The damage and even failure of hard brittle rocks has been the most important challenge facing the safety of construction of deep engineering works,so the key to solving this problem is the recognition of the strength characteristics and description of the mechanical behavior of hard brittle ***,in view of this problem,in this study,we first analyzed the strength and mechanical response characteristics revealed in tests of,and site excavation in,hard brittle ***,by analyzing rock-strength envelopes on meridional and deviatoric planes,the generalized polyaxial strain energy(GPSE)strength criterion was *** allows description of the effects of the minimum principal stress,intermediate principal stress,hydrostatic pressure,and Lode’s angle of stress on the strength of hard *** establishing evolutionary relationships of strength parameters and dilation parameters with plastic volumetric strain in rock failure,we established an elasto-plastic mechanical constitutive model for hard brittle rocks based on the GPSE *** addition,through use of the failure approach index theory and the dilatancy safety factor,an evaluation index for degree of damage considering dilatant effects of rocks was ***,the constitutive model established in this study and the proposed evaluation index were integrated into the numerical simulation method to simulate triaxial tests on rocks and numerical simulation of deformation and fracture of the rocks surrounding the deep-buried auxiliary tunnels in China’s Jinping II Hydropower *** this way,the reasonableness of the model and the index was *** strength theory and the constitutive model established in this research are applicable to the analysis of high-stress deformation and fracture of hard brittle rock masses,which supports the theoretical work related to deep engineering operations.

关键词： Hard brittle rock.Constitutive model Safety evaluation index.Dilatant effect Strength criterion

来源：

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

小柴胡汤治疗外感热病(邪郁少阳证) 的临床研究

引用

临床医学工程 2024年第1期31卷 57-58页

作者：黄树凌吴晖福建中医药大学附属人民医院急诊科福建福州350800

目的探讨小柴胡汤治疗外感热病(邪郁少阳证)的效果。方法选取2021年7月至2023年11月本院收治的60例外感热病患者,按照奇偶顺序分为观察组与对照组。对照组采用西药治疗,观察组采用小柴胡汤治疗。比较两组治疗效果、症状消失时间、炎性... 详细信息

目的探讨小柴胡汤治疗外感热病(邪郁少阳证)的效果。方法选取2021年7月至2023年11月本院收治的60例外感热病患者,按照奇偶顺序分为观察组与对照组。对照组采用西药治疗,观察组采用小柴胡汤治疗。比较两组治疗效果、症状消失时间、炎性因子。结果观察组总有效率为96.67%,高于对照组的73.33%(P<0.05)。观察组各项症状消失时间短于对照组(P<0.05)。治疗后,观察组TNF-α、IL-1β水平低于对照组(P<0.05)。结论小柴胡汤治疗外感热病(邪郁少阳证)的效果理想,可快速改善患者症状,抑制机体炎性因子。

关键词：小柴胡汤外感热病治疗效果

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

经口双气囊小肠镜圈套碎石治疗5例小肠结石伴梗阻的临床观察

引用

中华消化内镜杂志 2024年第6期41卷 484-486页

作者：石亮亮李正超黄淑玲葛靖童玉琴张以洋南京大学医学院附属鼓楼医院消化内科南京210008

为评估经口双气囊小肠镜圈套碎石治疗小肠结石伴梗阻的安全性和有效性,回顾性分析2021年12月至2023年3月间南京大学医学院附属鼓楼医院诊治的小肠结石伴梗阻患者的临床、内镜、影像、病理和手术相关资料。共纳入5例患者,均为女性,年龄52... 详细信息

为评估经口双气囊小肠镜圈套碎石治疗小肠结石伴梗阻的安全性和有效性,回顾性分析2021年12月至2023年3月间南京大学医学院附属鼓楼医院诊治的小肠结石伴梗阻患者的临床、内镜、影像、病理和手术相关资料。共纳入5例患者,均为女性,年龄52~83岁,临床表现主要是消化道梗阻,结石长径30~50 mm,位于空肠3例、回肠近段1例、空回交界1例。术前3例经影像学诊断为小肠结石。5例均达到技术成功。4例达到临床成功,梗阻症状完全缓解;1例因合并恶性梗阻临床症状部分缓解。术后5例均未出现明显并发症,随访15~790 d,无复发。结果显示经口双气囊小肠镜圈套碎石治疗小肠结石安全有效,为小肠结石患者提供了除外科手术治疗外的一种新的治疗方法。

关键词：胃肠结石肠梗阻碎石术双气囊小肠镜

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

敞开式TBM开挖隧洞围岩变形安全评价方法及应用

引用

人民长江 2024年第6期55卷 182-187页

作者：刘登学孔勇斌寇甲兵黄书岭张雨霆长江科学院水利部岩土力学与工程重点实验室湖北武汉430010 云南省滇中引水工程有限公司云南昆明650000

当TBM开挖隧洞遭遇不良地质条件下的围岩大变形地质灾害时,通常会造成卡机或侵限等风险。开展TBM开挖隧洞围岩变形安全评价工作对降低卡机或侵限等风险具有重要的现实意义。通过分析敞开式TBM开挖隧洞围岩变形特点,建立了敞开式TBM开挖... 详细信息

当TBM开挖隧洞遭遇不良地质条件下的围岩大变形地质灾害时,通常会造成卡机或侵限等风险。开展TBM开挖隧洞围岩变形安全评价工作对降低卡机或侵限等风险具有重要的现实意义。通过分析敞开式TBM开挖隧洞围岩变形特点,建立了敞开式TBM开挖隧洞围岩变形安全评价方法。该方法通过采用三维数值分析和围岩变形现场监测手段,可获得围岩在护盾区间以及出露护盾后的变形,从而实现敞开式TBM开挖隧洞围岩变形安全性判别。在滇中引水工程香炉山隧洞的工程应用表明,所提方法能够有效判别不同支护方案下的围岩变形安全性,从而为敞开式TBM开挖隧洞施工期支护方案实时调整提供依据。

关键词： TBM 围岩变形安全评价卡机侵限香炉山隧洞滇中引水工程

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：