Burst strain disturbance—A new test study on fracture precursor   总被引：1，自引：0，他引：1  

ZHAO YONG XU ) RUN HAI YANG ) BIN WANG ) JIN MING ZHAO ) YU FENG YAO ) PEI ZHONG HUA ) SHI RONG MEI ) ) Seismological Bureau of Yunnan Province  Kunming    China ) Center for Analysi 《地震学报(英文版)》1998,(6)

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关于伊利石结晶度诸指数的评价   总被引：5，自引：1，他引：4  

() 《岩石学报》1998

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SEPARATION OF JETS FROM COMET HALE-BOPP'S COMA BY WAVELET METHOD     

Tao Jun Qian Bo-chen Tang Yuan 《紫金山天文台台刊》1998,(2)

A new multiscale technique, the wavelet transform, is applied to the study of jets of comet. It has the advantage to show the features of jets.  相似文献   

Urban forest loss using a GIS-based approach and instruments for integrated urban planning:A case study of Jo(a)o Pessoa,Brazil     

Leandro Ismael de Azevedo LACERDA  José Augusto Ribeiro da SILVEIRA  Celso Augusto Guimar 《地理学报(英文版)》2021,31(10):1529-1552

Urban forests play an important role in the thermal comfort and overall life of local populations in large-and medium-sized cities.This study analyzes urban forest loss and maps land use and land cover (LULC) changes between 1991 and 2018 by evaluating the use of urban planning instruments for the mitigation of urban forest loss in Jo～o Pessoa,Brazil.For this purpose,satellite-derived LULC images from 1991,2006,2010 and 2018 and data on urban forest loss areas obtained using the Google Earth Engine were used.In addi-tion,this paper also discusses the instruments used for integrated urban planning,which are(a) the legal sector,responsibility and nature;(b) the urban expansion process;and (c) the elements of urban infrastructure.The results show a clear shift in land use in the study area.The major changes in LULC classes occurred in urban areas and herbaceous vegetation,while the greatest loss was in arboreal/shrub vegetation.Thus,an increase in the pressure to occupy zones intended for environmental preservation could be estimated.Our results showed similar accuracies with other studies and more spatial details.The characteristics of the patterns,traces,and hotspots of urban expansion and forest cover loss were explored.We highlighted the potential use of this proposed framework to be applied and validated in other parts of the world to help better understand and quantify various aspects of ur-ban-related problems such as urban forest loss mapping using instruments for integrated urban planning and low-cost approaches.  相似文献   

玄武岩柱状节理成因性状研究及其对岩体质量的影响   总被引：1，自引：0，他引：1       下载免费PDF全文

陈旭  许模  康小兵  魏云杰 《地质找矿论丛》2008,23(3):260-263

峨眉山玄武岩中普遍发育柱状节理,表现为岩体破碎不完整,其明显受各种原生构造、表生改造、构造的影响.文章结合拟建的西南某水电工程对玄武岩柱状成因分析及性状研究,进一步研究其对岩体质量的影响.  相似文献   

测绘人的战“疫”风采     

吴荒源 《资源导刊(河南)》2020,(6):F0003-F0003

本刊讯新冠肺炎疫情发生以来,河南省测绘地理信息局广大党员干部按照局党委的要求部署,踊跃投身疫情防控工作,充分发挥了先锋模范作用,让党旗在疫情防控第一线高高飘扬。志愿服务筑牢疫情“防控墙”为缓解社区防控压力,全局党员干部组成抗击疫情志愿服务队,前往共建单位戊院社区开展疫情防控工作。志愿服务队密切配合社区党组织和派出所,认真开展疫情防控宣传和文明劝导工作,协助社区工作者对家属院进出人员进行体温监测,做好信息登记,并督促提醒他们规范佩戴口罩,齐心协力为共同打赢疫情防控阻击战而奋斗。  相似文献   

青海卓尔山     

赵京生 《资源导刊(河南)》2020,(2):F0004-F0004

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刘金山在检查疫情防控工作时要求 高效有序做好全省自然资源系统疫情防控工作     

王星  田润生  侯斌 《资源导刊(河南)》2020,(3):F0002-F0002

2月3日节后上班第一天,河南省自然资源厅党组书记刘金山到厅机关南门值班室、西门值班室和机关餐厅等疫情防控监测点检查指导新型冠状病毒肺炎疫情防控工作,仔细检查人员配备、设备运作、监测记录和餐厅备餐等情况。刘金山强调,当前是打好打赢疫情防控阻击战的最关键时期,节后人员返程高峰就要到来,疫情防控面临新的挑战与考验。省委、省政府召开专题会议,传达贯彻了党中央、国务院的最新部署和要求,对下一步疫情防控工作进行了再动员、再部署、再安排。  相似文献   

Sediment Transport in Rivers and Coastal Waters     

YANG  Shu-qing 《中国海洋工程》2003,17(4):527-540

Following Bagnold's approach, a relationship between sediment transport and energy dissipation is developed. The major assumption made in the study is that the near bed velocity plays a dominant role in the process of sediment transport. A general relationship between energy dissipation and sediment transport is first proposed. Then the equations for total sediment transport are derived by introducing the appropriate expression of energy dissipation rate under different conditions, such as open channel flows, combination of wave and current, as well as longshore sediment transport. Within the flows investigated, the derived relationships are fairly consistent with the available data over a wide range of conditions.  相似文献   

Fatigue Behavior of Plain Concrete Under Biaxial Compression: Experiments and Theoretical Model     

ZHU  Jin-song 《中国海洋工程》2003,17(4):617-630

The effects of different lateral confinement stress on the fatigue behavior of and cumulative damage to plain concrete are investigated experimentally. Eighty 100 mm x 100 mm x 100 mm specimens of ordinary strength concrete are tested under constant- or variable-amplitude fatigue loading and lateral confinement pressure in two orthogonal directions. A fatigue equation is developed by modifying the classical Aas-Jakobsen S-N equation for taking into account the effect of the confined stress on fatigue strength of plain concrete. The results of variable-amplitude fatigue tests indicate that the linear damage theory proposed by Palmgren and Miner is unreasonable in the biaxial stress state. A nonlinear cumulative damage model that could model the effects of the magnitude and sequence of variable-amplitude fatigue loading and lateral confinement pressure is proposed on the basis of the evolution laws of the residual strains in the longitudinal direction during fatigue tests. The residual fatigue life predic  相似文献