检索结果-南通市图书馆

Failure evolution and disaster prediction of rock under uniaxial compression based on non-extensive statistical analysis of electric potential

引用

International Journal of Mining Science and Technology 2024年第07期 975-993页

作者： Tiancheng Shan Zhonghui Li Haishan Jia Enyuan Wang xiaoran Wang Yue Niu xin Zhang dong Chen Shan Yin quancong Zhang State Key Laboratory of Coal Mine Disaster Prevention and Control China University of Mining and Technology National Engineering Research Center for Coal Gas Control China University of Mining and Technology School of Safety Engineering China University of Mining and Technology State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources China University of Mining and Technology State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology

Rock failure can cause serious geological disasters, and the non-extensive statistical features of electric potential(EP) are expected to provide valuable information for disaster prediction. In this paper, the uniaxial compression experiments with EP monitoring were carried out on fine sandstone, marble and granite samples under four displacement rates. The Tsallis entropy q value of EPs is used to analyze the selforganization evolution of rock failure. Then the influence of displacement rate and rock type on q value are explored by mineral structure and fracture modes. A self-organized critical prediction method with q value is proposed. The results show that the probability density function(PDF) of EPs follows the qGaussian distribution. The displacement rate is positively correlated with q value. With the displacement rate increasing, the fracture mode changes, the damage degree intensifies, and the microcrack network becomes denser. The influence of rock type on q value is related to the burst intensity of energy release and the crack fracture mode. The q value of EPs can be used as an effective prediction index for rock failure like b value of acoustic emission(AE). The results provide useful reference and method for the monitoring and early warning of geological disasters.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

黑龙江流域植被覆盖度时空动态及其对气候变化的响应

引用

应用生态学报 2024年第6期35卷 1518-1524页

作者：胡蓉董灵波东北林业大学林学院森林生态系统可持续经营教育部重点实验室哈尔滨150040

探究黑龙江流域植被覆盖度时空动态特征及其对气候变化的响应,可为该地区3个国家(蒙古国、中国和俄罗斯)开展流域综合治理提供理论依据和数据支撑。本研究以黑龙江流域为对象,基于Google Earth Engine(GEE)平台提供的2000—2020年的MOD1... 详细信息

探究黑龙江流域植被覆盖度时空动态特征及其对气候变化的响应,可为该地区3个国家(蒙古国、中国和俄罗斯)开展流域综合治理提供理论依据和数据支撑。本研究以黑龙江流域为对象,基于Google Earth Engine(GEE)平台提供的2000—2020年的MOD13q1遥感数据,按最大值法合成归一化植被指数(NDVI),并利用像元二分模型计算植被覆盖度(FVC),采用Sen+MK趋势法分析植被覆盖度动态变化,利用皮尔逊相关系数量化植被覆盖度对气候变化的响应。结果表明:2000—2020年间,黑龙江流域FVC整体呈轻微减少趋势,年际变化率为0.1%,其中,蒙古国FVC呈波动上升趋势(0.13%),而俄罗斯(0.15%)和中国(0.08%)则呈轻微减少趋势;区域内FVC以轻微退化和严重退化为主,面积占比分别为34%和17%,而显著改善区域仅占9%;降水对研究区FVC的影响显著大于气温,降水和气温对FVC影响显著的面积占比分别为8.2%和2.2%,其中,降水与蒙古国区FVC的相关系数最高(r=0.446,P<0.05),而与俄罗斯区FVC的相关系数最低(r=-0.442,P<0.05)。

关键词：植被覆盖度 MODIS 归一化植被指数像元二分模型相关性分析

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

World Federation of Acupuncture-Moxibustion Societies (WFAS) Clinical Practice Guideline on Acupuncture and Moxibustion: Migraine recommendation summaries

引用

World Journal of Acupuncture - Moxibustion 2024年第3期34卷 204-212页

作者： MA W.-q. CUI S. HU J. CHEN Z.-J. HUO J. LIU Y.-P. WANG x.-Y. SONG Z.-W. GAO q. MA S.-H. ZHANG Y. WU Z.-C. ZHAO J.-P. JING x.-H. WU x.-D. FEI Y.-T. xU B. CHEN S.-Z. qIAN C. YANG C.-G. ZHANG D.-q. ZHAO L. LI B. Petti F. Liguori A. Llopis C. Skopalik C. dong Z. YIN J. HUA Z. WANG D.-S. Lutterjohann G. JIAO Y. WANG J.-J. Institute of Acupuncture and moxibustion China Academy of Chinese Medical Sciences (中国中医科学院针灸研究所北京 100700 中国) 100700 Beijing China Experimental Research Center China Academy of Chinese Medical Sciences (中国中医科学院医学实验中心北京 100700 中国) 100700 Beijing China dongzhimen Hospital Beijing University of Chinese Medicine (北京中医药大学东直门医院北京 100007 中国) 100007 Beijing China School of Traditional Chinese Medicine Beijing University of Chinese Medicine (北京中医药大学中医学院北京 100105 中国) 100105 Beijing China Key Laboratory of the Ministry of Education for the Integration of Needle and Medicine Nanjing University of Chinese Medicine (南京中医药大学针药结合教育部重点实验室南京 210023 中国) Nanjing 210023 China School of Acupuncture-moxibustion and Tuina Massage Shandong University of Traditional Chinese Medicine (山东中医药大学针灸推拿学院济南 250355中国) Jinan 250355 China Shenzhou Open University of Traditional Chinese medicine (神州中医大学北荷兰省 67 1011 EK 荷兰) EK Noord-Holland 67 1011 Netherlands Chinese Medicine Society Sweden (瑞典针灸学术研究会斯德哥尔摩 10653 瑞典) Stockholm 10653 Sweden School of Acupuncture-moxibustion and Tuina Massage Chengdu University of Traditional Chinese Medicine (成都中医药大学针灸推拿学院成都 610075 中国) Chengdu 610075 China Acupuncture-moxibustion Department of Beijing Hospital of Traditional Chinese Medicine (首都医科大学附属北京中医医院北京 100010 中国) 100010 Beijing China Istituto Paracelso (帕拉塞尔索研究所罗马 00153 意大利) Rome 00153 Italy European Foundation of Traditional Chinese Medicine (欧洲中医药基金会马德里 28000 西班牙) Madrid 28000 Spain Department of Neurology First Medical Center of Chinese PLA General Hospital (解放军总医院第一医学中心神经内科北京 100039中国) Beijing China Department of Neurology of Beijing Hospital (北京医院神经内科北京 100853 中国) 100853 Beijing China Anesthesiology Department and pain diagnosis and treatment center Beijing Hospital (北京医院麻醉科疼痛诊疗中心北京 100853 中国) 100853 Beijing China Division of Psychology of Beijing Normal University (北京师范大学心理学部北京 100091 中国) 100091 Beijing China German Medical Association for

Clinical Practice Guideline on Acupuncture and Moxibustion: Migraine (WFAS 007.9-2023) is a clinical practice guideline officially released by the World Federation of Acupuncture-Moxibustion Societies (WFAS) on October 9, 2023, and is the first international guideline on the treatment of migraine with acupuncture. This international standard was developed under the guidance of rigorous evidence-based methodology, and it contains guideline purpose, scope, applicable population, applicable settings, overview of acupuncture for migraine, guideline development process and recommendations. For promoting the understanding and application of this guideline, this article summarizes a total of 18 recommendations in order to assist clinical decisions for migraine with acupuncture. © 2024

关键词： Acupuncture and moxibustion Guideline Migraine Recommendation

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

Formation of intermetallic phases in unrefined and refined AA6082 Al alloys investigated by using SEM-based ultramicrotomy tomography

引用

Journal of Materials Science & Technology 2022年第25期120卷 118-128页

作者： J.M.Yu T.Hashimoto H.T.Li N.Wanderka Z.Zhang C.Cai x.L.Zhong J.qin q.P.dong H.Nagaumi x.N.Wang Shagang School of Iron and Steel and High-Performance Metal Structural Materials Research Institute Soochow UniversitySuzhou 215137China School of Materials The University of ManchesterSackville StreetManchester M139PLUK Chinalco Materials Application Research Institute Co.Ltd. Beijing 102200China Helmholtz-Zentrum Berlin Für Materialien und Energie Hahn-Meitner-Platz 1Berlin 14109Germany Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

The spatial arrangement,distribution and morphology of Fe-bearing intermetallics in AA6082 alloys depends on the manufacturing process of the alloy and thus influences the macroscopic ***,the microstructure of a near industrial scale casting AA6082 Al alloy fabricated by:(a)direct chill casting,(b)Al-5 Ti-1 B grain refiner addition and(c)intensive melt shearing has been investigated by threedimensional visualization using SEM-based serial ultra microtomy *** formation sequence of phases in AA6082 alloys is generally categorized into four stages:formation ofα-Al grains,Fe-bearing intermetallics,Mg_(2)Si phase,and eutectic *** of three-dimensional visualization of the microstructure indicated that TiBparticles not only could nucleate Fe-bearingβ-intermetallics,but also could provide substrate for the formation of Fe-bearingα-intermetallics and Mg_(2)Si.A further deep analysis reveals that the essential condition for the formation of secondary phases such as Fe-bearing intermetallics and Mg_(2)Si phase is the build-up of a supersaturated solute front at theα-Al solid-liquid interface irrespective of the specific nucleation *** addition,the results indicate that grain refinement processing causes the severe interconnectivity of Fe-bearingα-***,the intensive melt shearing is a better manufacturing process because the intermetallics are more evenly distributed and refined than with the addition of the grain refiner,thereby improving the properties of the alloy.

关键词： Al-Si-Mg alloy Grain refinement Al-Fe-Si intermetallic phase Tomography Ultramicrotomy Mg2Si

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

Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates

引用

Frontiers of physics 2018年第4期13卷 159-165页

作者： Jin Peng x. M. Gu G. T. Zhou W. Wang J. Y. Liu Yu Wang Z. q. Mao x. S. Wu Shuai dong School of Physics Southeast University Nanjing 211189 China Collaborative Innovation Center of Advanced Microstrucutres Lab of Solid State Microstructures School of Physics Nanjing University Nanjing 210093 China Department of Physics and Engineering Physics Tulane University New Orleans LA 70118 USA

We present a detailed investigation of the specific heat of Ca3（Ru1-xMx）2O7 （M = Ti, Fe, Mn） single crystals. Depending on the dopant and doping level, three distinct regions are present： a quasi- two-dimensional metallic state with antiferromagnetic （AFM） order formed by ferromagnetic bilayers （AFM-b）, a Mott insulating state with G-type AFM order （G-AFM）, and a localized state with a mixed AFM-b and G-AFM phase. Our specific heat data provide deep insights into the Mort transitions induced by Ti and Mn doping. We observed not only an anomalous large mass enhancement, but also an additional term in the specific heat, i.e., C ∝ T2, in the localized region. The C ∝ T2 term is most likely due to long-wavelength excitations with both FM and AFM components. A decrease in the Debye temperature is observed in the G-type AFM region, indicating lattice softening associated with the Mott transition.

关键词： specific heat ruthenates Mort insulator phase separation

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

COORELATION ANALYSIS OF SURFACE PRESSURE FLUCTUATIONS ON THREE EqUISPACED CYLINDERS

引用

Journal of Hydrodynamics 2001年第2期13卷 55-62页

作者： dong, L.Y. xu, Y.H. Huang, D.q. Inst. of Appl. Math. and Mech. Shanghai Univ. Shanghai 200072 China

The fluctuating pressures on the surface of three circular cylinders in equispaced arrangement were measured simultaneously in the medium subcritical regime (Re=3×104). The distributions of their rms values and circumferential correlation were obtained in the spacing range from 1.25 to 6.0. The spatial correlation of pressures of two pressure taps on two different cylinders at the same azimuth was investigated as well. Owing to different flow patterns in various arrangements and spacing, these correlation curves of pressure show different distributions. The lift fluctuation can be estimated qualitatively from the circumferential coefficient curve with the knowledge of the rms pressure distribution. Some critical spacing for each arrangement were found that the flow regimes and the corresponding pressure correlation take a sudden change. Flow interference between cylinders in each arrangement was also discussed with various flow regimes.

关键词： Cylinders (shapes) Experiments Flow interactions Flow patterns Pressure distribution Pressure measurement

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

STRUCTURAL TRANSFORMATION INDUCED BY MECHANICALLY DRIVEN ALLOYING AND SUBSEqUENT MAGNETIC PROPERLIESOF THE Fe-Cu SYSTEM

引用

Acta Metallurgica Sinica(English Letters) 1998年第2期11卷 128-136页

作者： Y.Z.Yang Y.HLuo q.S.Li Y.L.Zhu x.M.Ma Y.D.dong Y.Z.Chuang Guangdong Univ of Technology Guangzhou China

The structural transformation in Fe-Cu powder induced by mechanically driven alloying has been monitored by the lattice constant measurements and Mossbauer spectroscopy. For the samples with Cu higher than 75at.% Mossbauer the spectra show a broad paramagnetic doublet; for samples with 50 and 60at.%Cu a new broad ferromagnetic sextet; for those with less than 30at.%Cu similar to those of α-Fe. The main peaks of the hyperfine field distribution significantly broaden and shift to a lower position with increasing Cu content due to the complex environments of iron atoms in the solid solutions and the reduction in the nearest neighbor Fe of a cental Fe atom, respectively. The saturation magnetization of Fe-Cu alloys monotonously decreases with Cu content. The complex composition dependence of coercive field for the milled samples is discussed with respect to the solid dissolution, grain size, interfacial state etc.. The increase of lattice constants with the solute content in the two terminal solid solutions has been explained by the volume-size factor theory or magnetovolume effect.

关键词： mechanical alloying Mossbauer effect Fe-Cu alloy magnetic measurement

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

碳化-冻融作用对风积沙混凝土氯离子传输的影响

引用

山东大学学报（工学版） 2024年第1期54卷 123-130页

作者：董伟周梦虎王雪松薛刚王栋内蒙古科技大学土木工程学院内蒙古包头014010 内蒙古自治区建筑结构防灾减灾工程技术研究中心内蒙古包头014010

为研究碳化-冻融循环作用对风积沙混凝土氯离子传输的影响,进行全风积沙混凝土经历碳化(0、14、28 d)后的冻融循环(50、100、150、200次)试验研究,根据碳化时间分为C0组、C1组、C2组。通过化学滴定法检测不同深度处混凝土中的氯离子质... 详细信息

为研究碳化-冻融循环作用对风积沙混凝土氯离子传输的影响,进行全风积沙混凝土经历碳化(0、14、28 d)后的冻融循环(50、100、150、200次)试验研究,根据碳化时间分为C0组、C1组、C2组。通过化学滴定法检测不同深度处混凝土中的氯离子质量分数,进而分析氯离子质量分数、分布、氯离子扩散系数以及碳化深度与时间依赖性的关系,并通过扫描电镜观察混凝土内部结构。结果表明:碳化生成的碳化产物使混凝土更加密实,能够有效抵抗氯离子的侵蚀,且碳化时间越长,抵抗氯离子侵蚀效果越明显;冻融循环增大混凝土裂缝的产生,为氯离子向内部传输提供通道;随着冻融循环次数增多,氯离子侵蚀也越严重,当冻融循环100次时,C0组氯离子侵入深度为30 mm,冻融循环150次时,所有混凝土氯离子侵入深度为30 mm;200次冻融循环条件下,C1组时间依赖性系数较C0组增加42.22%,C2组较C0组增加57.78%,较C1组增加10.94%。风积沙混凝土内部氯离子质量分数随冻融循环次数增加逐步增加,随碳化深度的增加逐步降低。

关键词：风积沙混凝土碳化-冻融循环自由氯离子氯离子扩散系数时间依赖性系数

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

quantized Conductance of Majorana Zero Mode in the Vortex of the Topological Superconductor(Li_(0.84)Fe_(0.16))OHFeSe

引用

Chinese Physics Letters 2019年第5期36卷 90-97页

作者： C.Chen q.Liu T.Z.Zhang D.Li P.P.Shen x.L.dong Z.-x.Zhao T.Zhang D.L.Feng State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433 Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 Science and Technology on Surface Physics and Chemistry Laboratory Mianyang 621908 National Laboratory of Superconductivity Institute of PhysicsChinese Academy of SciencesBeijing 100190 Hefei National Laboratory for Physical Science at Microscale CAS Center for Excellence in Quantum Information and Quantum Physicsand Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026

The Major ana zero mode(MZM), which manifests as an exotic neutral excitation in superconductors, is the building block of topological quantum computing. It has recently been found in the vortices of several iron-based superconductors as a zero-bias conductance peak in tunneling spectroscopy. In particular, a clean and robust MZM has been observed in the cores of free vortices in(Li_(0.84)Fe_(0.16))OHFeSe. Here using scanning tunneling spectroscopy, we demonstrate that Major ana-induced resonant Andreev reflection occurs between the STM tip and this zero-bias bound state,and consequently, the conductance at zero bias is quantized as 2e^2/h. Our results present a hallmark signature of the MZM in the vortex of an intrinsic topological superconductor, together with its intriguing behavior.

关键词： OHFeSe quantized Conductance of Majorana Zero Mode in the Vortex of the Topological Superconductor MZM Li STM Fe

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

Simultaneous high-resolution x-ray backlighting and self-emission imaging for laser-produced plasma diagnostics using a two-energy multilayer Kirkpatrick–Baez microscope

引用

Matter and Radiation at Extremes 2022年第1期7卷 47-52页

作者： S.Z.Yi J.q.dong L.Jiang q.S.Huang E.F.Guo Wang Z.S. MOE Key Laboratory of Advanced Micro-Structured Materials No.1239 Siping RoadShanghai 200092China School of Physics Science and Engineering Tongji UniversityShanghai 200092China Shanghai Institute of Laser Plasma CAEPP.O.Box 919-988Shanghai 201800China

A simultaneous high-resolution x-ray backlighting and self-emission imaging method for laser-produced plasma diagnostics is developed in which two Kirkpatrick–Baez imaging channels for high-energy and low-energy diagnostics are constructed using a combination of multilayer mirrors in near-coaxial *** using a streak or framing camera placed on the image plane,both backlit and self-emission images of a laserproduced plasma with high spatial and temporal resolution can be obtained simultaneously in a single *** paper describes the details of the method with regard to its optical and multilayer design,assembly,and alignment *** addition,x-ray imaging results with a spatial resolution better than 5μm in the laboratory and experimental results with imploding capsules in the SG-III prototype laser facility are presented.

关键词： method. multilayer resolution

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

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：