检索结果-南通市图书馆

movement and strain conditions of active blocks in the Chinese mainland

Science China Earth Sciences 2003年第z2期46卷 82-117页

作者： LI Yanxing (李延兴) YANG Guohua (杨国华) LI Zhi (李智) GUO Liangqian (郭良迁) HUANG Cheng (黄珹) ZHU Wenyao (朱文耀) FU Yang (符养) WANG Qi (王琪) JIANG Zaisen (江在森) WANG Min (王敏) First Crustal Deformation Monitoring Center China Seismological Bureau Tianjin 300180 China First Crustal Deformation Monitoring Center China Seismological Bureau Tianjin 300180 China First Crustal Deformation Monitoring Center China Seismological Bureau Tianjin 300180 China First Crustal Deformation Monitoring Center China Seismological Bureau Tianjin 300180 China Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030 China Institute of Seismology China Seismological Bureau Wuhan 430071 China Center for Earthquake Analysis and Prediction China Seismological Bureau Beijing 100036 China Center for Earthquake Analysis and Prediction China Seismological Bureau Beijing 100036 China

The definition of active block is given from the angles of crustal deformation and strain. The movement and strain parameters of active blocks are estimated according to the unified velocity field composed of the velocities at 1598 GPS stations obtained from GPS measurements carried out in the past years in the Chinese mainland and the surrounding areas. The movement and strain conditions of the blocks are analyzed. The active blocks in the Chinese mainland have a consistent E-trending movement component, but its N and S components are not consistent. The blocks in the western part have a consistent N-trending movement and the blocks in the eastern part have a consistent S-trending movement. In the area to the east of 90°E, that is the area from Himalayas block towards NE, the movement direction of the blocks rotates clockwisely and the movement rates of the blocks are different. Generally, the movement rate is large in the west and south and small in the east and north with a difference of 3 to 4 times between the rates in the west and east. The distributions of principal compressive strain directions of the blocks are also different. The principal strain of the blocks located to the west of 90oE is basically in the SN direction, the principal compressive strain of the blocks in the northeastern part of Qingzang plateau is roughly in the NE direction and the direction of principal compressive strain of the blocks in the southeastern part of Qingzang plateau rounds clockwisely the east end of Himalayas structure. In addition, the principal strain and shear strain rates of the blocks are also different. The Himalayas and Tianshan blocks have the largest principal compressive strain and the maximum shear strain rate. Then, Lhasa, Qiangtang, Southwest Yunnan (SW Yunnan), Qilian and Sichuan-Yunan (Chuan-Dian) blocks followed. The strain rate of the blocks in the eastern part is smaller. The estimation based on the stain condition indicates that Himalayas block is still

关键词： active block, movement condition, strain condition.

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

Effects of coke charging pattern on burden movement in COREX melter gasifier based on physical simulation

引用

Journal of Iron and Steel Research International 2022年第6期29卷 907-913页

作者： Li-hao Han Yue-hua Li Li-ning Han Yan-xia Liu Wei-qing Huang Lei Cao Su-ci Qi Xin Guan Jian-lu Yuan Department of Material Engineering Hebei College of Industry and TechnologyShijiazhuang 050091HebeiChina Department of Basic Course Teaching Hebei College of Industry and TechnologyShijiazhuang 050091HebeiChina First Rolling Mill Anyang Iron&Steel Co.Ltd.Anyang 455000HenanChina

A three-dimensional semicircle cold model of COREX melter gasifier(MG)was established,and the effects of coke charging pattern on burden movement were investigated by adopting this *** burden flow pattern of packed bed was measured with different coke charging amounts,coke charging positions,and coke *** results show that the solid flow pattern presents a change from straight line type to reverse U type and finally to W type in MG with traditional coke charging,while the burden flow pattern experiences the change from straight line type to W type with platform and finally W type under center coke charging,and the solid flow pattern presents a change from straight line type to W type with platform and finally W type under intermediate coke *** difference demonstrates that coke charging pattern affects the uniform descending in MG to some *** burden in the coke charging zone keeps a straight line *** matter what kind of coke charging pattern is adopted,the burden residence time is shortened with the increase in coke charging amount,and the vertex of deadman decreases obviously,which is conducive to the renewal of the *** appropriate coke charging amount and coke size should be well controlled at 8.7%and 5 mm,*** results are useful not only in developing further understanding of solid flow in MG but also in verifying different mathematical models,particularly the coupled discrete element method with computational fluid dynamics simulation which has been increasingly used in the literature.

关键词： COREX melter gasifier Coke charging pattern Burden movement Flow pattern Physical simulation

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

Calculation of maximum ground movement and deformation caused by mining

引用

中国有色金属学会会刊：英文版 2011年第S3期21卷 562-569页

作者： LI Pei-xian1, 2, TAN Zhi-xiang1, 2, DENG Ka-zhong1, 2 1. Key Laboratory for Land Environment and Disaster Monitoring of State Bureau of Surveying and Mapping, China University of Mining and Technology, Xuzhou 221116, China 2. Jiangsu Key Laboratory of Resources and Environmental Information Engineering, China University of Mining and Technology, Xuzhou 221116, China [a] Key Laboratory for Land Environment and Disaster Monitoring of State Bureau of Surveying and Mapping China University of Mining and Technology Xuzhou 221116 China [b] Jiangsu Key Laboratory of Resources and Environmental Information Engineering China University of Mining and Technology Xuzhou 221116 China

In order to know the maximum mining ground deformation of arbitrary surface point, directions of the maximum surface tilt, curvature,horizontal displacement and horizontal deformation caused by multi-working faces were deduced based on probability integral method. The distribution forms of surface deformations in all direction φ∈[0, 2π] were obtained and also equations of maximum deformations were given based on calculation of mining ground deformation in direction φ. A mining subsidence analysis system was developed with VB6.0. The system implements the probability integral mining subsidence prediction with direct integration method, and it can avoid errors of arbitrary shaped working face subdivision of traditional method, and accuracy of mining subsidence prediction can be improved with the direct integral method. The system implements the contour chart and profile chart and also data analysis automation by manipulation of the SURFER kernel function and it complements the defect of existing subsidence prediction software. Calculation of maximum deformations caused by multi-working faces mining in a coal mine of Xuzhou, China was shown as application example. Engineering application indicates that maximum deformation of mining ground surface can be calculated and analyzed by the system. The research provides a theoretical basis and calculation tool for mining subsidence prediction and analysis.

关键词： mining subsidence probability integral method movement and deformation system development

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

Frequency-amplitude behavior in the incipient movement of grains under vibration

引用

Particuology 2018年第5期16卷 1-9页

作者： Karina A.Valenzuela Aracena Jesica G.Benito Luc Oger Irene Ippolito Rodolfo O.Ufiac Ana M.Vidales INFAP.CONICET Departamento de FfsieaFacultad de Ciencias Fisico Matemdticas y NaturalesUniversidad Nacional de San LuisEjerdto de los Andes 950D5700HHWSan LuisArgentina Institut de Physique de Rennes UMR UR1-CNRS 6251Universite de Rennes 1263Avenue du General LeclercCampus de BeaulieuCS 7420535042 Rennes CedexFrance Universidad de Buenos Aires Facultad de IngenierfaGrupo de Medios PorososPaseo Colon 8501063Buenos AiresArgentina

The onset of the movement of particles placed on a horizontal rough surface subject to a vertical sinusoidal vibration is investigated through tracking experiments,theoretical analysis,and numerical simulations. The frequency of vibration needed to move particles decays exponentially with the amplitude of the oscillatory *** behavior is explained through a simple mechanism in which a forced damped harmonic oscillator with a spring constant represents all the interactions between the particle and the *** numerical results compare well with experimental data,demonstrating that the forces included in the numerical calculations suitably account for the main particle response,even though the complexity of the surface is not fully taken into *** the way in which frequency varies with amplitude could be relevant to technological applications such as cleaning of material surfaces.

关键词： Vibration Incipient movement Forced oscillator 3D DEM simulation

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

Upward surface movement above deep coal mines after closure and flooding of underground workings

引用

International Journal of Mining Science and Technology 2018年第1期28卷 53-59页

作者： André Vervoort Pierre-Yves Declercq Department of Civil Engineering KU Leuven Geological Survey of Belgium Royal Belgian Institute of Natural Sciences

After the mass closures of entire coal mine districts in Europe at the end of the last century, a new phenomenon of surface movement was observed—an upward *** most surface movement(i.e., subsidence) occurs in the months and years after mining by the longwall method, surface movement still occurs many decades after mining is *** the closure and flooding of underground excavations and surrounding rock, this movement was *** paper focuses on quantifying the upward movement in two neighboring coal mines(Winterslag and Zwartberg, Belgium).The study is based on data from a remote sensing technique: interferometry with synthetic aperture radar(INSAR).The results of the study show that the rate of upward movement in the decade after closure is about 10 mm/year on *** upward movements are not linked directly to the past exploitation directly underneath a *** amounts of subsidence at specific locations are linked mainly to their positions relative to an inverse trough shape situated over the entire mined-out areas and their immediate *** features, such as geological faults, can have a secondary effect on the local variation of the *** processes of subsidence and uplift are based on completely different *** is initiated by a caving process, while the process of uplift is clearly linked to flooding.

关键词： Coal mining Surface movement Subsidence Uplift Radar-interferometry

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

Strata movement and stress evolution when mining two overlapping panels affected by hard stratum

引用

International Journal of Mining Science and Technology 2019年第5期29卷 691-699页

作者： Jianguo Zhang Wei Yang Baiquan Lin Jinjing Zhang Man Wang State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization China Pingmei Shenma GroupPingdingshan 467000China Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology) Ministry of EducationXuzhou 221116China China Pingmei Shenma Group Pingdingshan 467000China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China

Mining causes stress redistribution and stratum *** this paper,a numerical model was built according to the geological conditions in the 12th coal mine in Pingdingshan city to study the strata movement and the evolution of stress when mining two overlapping longwall panels,named panels#14 and#*** strata close to the mined panel move directly towards the gob,while the strata that are farther away swing back and forth during the mining *** directed movement and swinging can break the transverse boreholes for gas extraction;a surface borehole should not be within the range of directional *** stress evolution suggested that the mining of the lower panel#15 after the upper panel#14 would further increase the de-stressed range,while the stress concentration around the mined panel would be *** strata usually carry a greater stress than adjacent rocks and soft coal *** stress in a hard stratum increases greatly,and the stress decreases greatly in the coal seams below the hard *** study supplies a reference for similar coal mines and is useful for determining the de-stressed range and transverse borehole arrangement for gas extraction.

关键词： Stratum movement Mining Longwall panel Hard stratum

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

Dislocation movement in Nitrogen-Doped Czochralski Silicon

引用

Chinese Physics Letters 1996年第5期13卷 382-385页

作者： WEI Ya-dong LIANG Jun-wu Department of Physics Shanxi UniversityTaiyuan 030006 Institute of Semiconductors Chinese Academy of SciencesBeijing 100083

Dislocation movemnent in N-doped Czochralski silicon(Cz-Si)was surrveyed by four point bend method,Dislocation mnovemnent velocities ***-Si doped with nitrogen,with both nitrogen and antimony,and with only antimony were investigated,The order of measured dislocation movement velocities,at 700℃≤T≤800℃ and under resolved stress σ=4.1 kg/mm^(2),was Vsp,O>V_(N,sb,O)>V_(N,O).The experiments showed that nitrogen doping could retard the movement ofdislocations.

关键词： Dislocation stress movement

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

Modified constraint-induced movement therapy alters synaptic plasticity of rat contralateral hippocampus following middle cerebral artery occlusion

引用

Neural Regeneration Research 2020年第6期15卷 1045-1057页

作者： Bei-Yao Gao Dong-Sheng Xu Pei-Le Liu Ce Li Liang Du Yan Hua Jian Hu Jia-Yun Hou Yu-Long Bai Department of Rehabilitation Medicine Huashan HospitalFudan UniversityShanghaiChina Rehabilitation Section Department of Spine SurgeryTongji Hospital of Tongji UniversityShanghaiChina Key Laboratory of Spine and Spinal Cord Injury Repair and Regeneration(Tongji University)Ministry of Education ShanghaiChina Zhongshan Hospital Institute of Clinical Science Fudan UniversityShanghaiChina

Modified constraint-induced movement therapy is an effective treatment for neurological and motor impairments in patients with stroke by increasing the use of their affected limb and limiting the contralateral ***,the molecular mechanism underlying its efficacy remains *** this study,a middle cerebral artery occlusion(MCAO)rat model was produced by the suture *** received modified constraint-induced movement therapy 1 hour a day for 14 consecutive days,starting from the 7^th day after middle cerebral artery *** 1 of treatment lasted for 10 minutes at 2r/min,day 2 for 20 minutes at 2 r/min,and from day 3 onward for 20 minutes at 4 r/*** gait analysis,adhesive removal test,and Y-maze test were used to investigate motor function,sensory function as well as cognitive function in rodent animals from the 1st day before MCAO to the 21^st day after *** the 21^st day after MCAO,the neurotransmitter receptor-related genes from both contralateral and ipsilateral hippocampi were tested by micro-array and then verified by western blot *** glutamate related receptor was shown by transmission electron microscopy and the glutamate content was determined by high-performance liquid *** results of behavior tests showed that modified constraint-induced movement therapy promoted motor and sensory functional recovery in the middle cerebral artery-occluded rats,but had no effect on cognitive *** modified constraint-induced movement therapy upregulated the expression of glutamate ionotropic receptor AMPA type subunit 3(Gria3)in the hippocampus and downregulated the expression of the beta3-adrenergic receptor gene Adrb3 and arginine vasopressin receptor 1 A,Avprla in the middle cerebral artery-occluded *** the ipsilateral hippocampus,only Adra2 a was downregulated,and there was no significant change in *** electron microscopy revealed a denser distribution the more distribution of postsynaptic glu

关键词： brain-derived neurotrophic factor glutamate hippocampus m CIMT middle cerebral artery occlusion modified constraint-induced movement therapy α-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid receptor

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

Early constraint-induced movement therapy affects behavior and neuronal plasticity in ischemia-injured rat brains

引用

Neural Regeneration Research 2019年第5期14卷 775-782页

作者： Xi-Hua Liu Hong-Yan Bi Jie Cao Shuo Ren Shou-Wei Yue Department of Physical Medicine & Rehabilitation Affiliated Hospital of Shandong Traditional Chinese Medicine University Maternal and Child Health Development Research Center Shandong Maternal and Child Health Hospital Department of Physical Medicine & Rehabilitation Qilu Hospital Shandong University

Constraint-induced movement therapy is an effective rehabilitative training technique used to improve the restoration of impaired upper extremity movement after stroke. However, whether constraint-induced movement therapy is more effective than conventional rehabilitation in acute or sub-acute stroke remains controversial. The aim of the present study was to identify the optimal time to start constraint-induced movement therapy after ischemic stroke and to explore the mechanisms by which constraint-induced movement therapy leads to post-stroke recovery. Sixty-four adult male Sprague-Dawley rats were randomly divided into four groups: sham-surgery group, cerebral ischemia/reperfusion group, early constraint-induced movement therapy group, and late constraint-induced movement therapy group. Rat models of left middle cerebral artery occlusion were established according to the Zea Longa line embolism method. Constraint-induced movement therapy was conducted starting on day 1 or day 14 in the early constraint-induced movement therapy and late constraint-induced movement therapy groups, respectively. To explore the effect of each intervention time on neuromotor function, behavioral function was assessed using a balance beam walking test before surgery and at 8 and 21 days after surgery. The expression levels of brain-derived neurotrophic factor, nerve growth factor and Nogo receptor were evaluated using real time-polymerase chain reaction and western blot assay to assess the effect of each intervention time. The results showed that the behavioral score was significantly lower in the early constraint-induced movement therapy group than in the cerebral ischemia/reperfusion and late constraint-induced movement therapy groups at 8 days. At 21 days, the scores had significantly decreased in the early constraint-induced movement therapy and late constraint-induced movement therapy groups. At 8 days, only mild pyknosis appeared in neurons of the ischemic penumbra in the early co

关键词： nerve regeneration ischemic stroke rehabilitation constraint-induced movement therapy nerve growth factors functional recovery neuronal plasticity real time-polymerase chain reaction western blot assay rats neural regeneration

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

Numerical simulations of deformation and movement of blocks within North China in response to 1976 Tangshan earthquake

引用

Science China Earth Sciences 2003年第z2期46卷 141-152页

作者： BAI Wuming (白武明) LIN Banghui (林邦慧) CHEN Zu'an (陈祖安) Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Institute of Geophysics China Seismological Bureau Beijing 100081 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

Using methods of discontinuous deformation analysis and finite element (DDA+FEM), this paper simulates dynamic processes of the Tangshan earthquake of 1976, which occurred in the northern North China where its internal blocks apparently interacted. Studies focus upon both the movement and deformation of the blocks, in particular, the Ordos block, and variations of stress states on the boundary faults. The Tangshan earthquake was composed of three events: slipping motions of NNE-striking major fault, NE-striking fault near the northeastern end of the NNE-striking fault, and NW-striking fault on the southeastern side of the NNE-striking fault. Compared with previous studies, our model yields a result that is more agreeable with the configuration of aftershock distributions. A number of data are presented, such as the principle stress field during the earthquake, contours of the maximum shear stress, the strike-slip deformation between blocks near the earthquake focus, time-dependent variations of slips of earthquake-triggered faulting, the maximum slip distance, and stress drops. These results are in accord with the earthquake source mechanism, basic parameters from earthquake wave study, macro-isoseismic line, observed horizontal displacement vectors, etc. The Tangshan earthquake exerted different influences on the adjacent blocks and boundary faults between them, thus resulting in differential movement and deformation. The Ordos block seems to have experienced the small-scale counterclockwise rotation and deformation, but its northeast part, bounded on the east by the Taihangshan and on the north by the Yanshan and Yinshan belts, underwent relatively stronger deformation. The Tangshan earthquake also changed the stress state of boundary faults of the North China, leading to an increase in shear stress and a decrease in normal stress in the NW-trending Zhangjiakou-Penglai fault through Tangshan City and the northern border faults of the Ordos block, and therefore rai

关键词： discontinuous deformation analysis, Tangshan earthquake, deformation and movement of block.

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：