关于地勘单位实行多元化经营的战略思考     

王琦 《中国煤炭地质》2013,(12):120-123

在我国煤炭工业发展速度放缓、发展困境凸显的形势下,结合煤炭地勘单位近20年来多种经营的发展历程,探讨了多元化经营两种基本形式及其利弊关系。根据煤炭地勘单位实行多元化经营具备的优势,提出了多数煤炭地勘单位在开展多元化经营时仍要坚持以核心业务、主营业务为主,在做强做大地质勘查主业的前提下,积极适度地开展相关多元化经营,如矿业开发、岩土工程勘察、社会地质服务等。对于建筑施工、旅游等虽有实践经验,但竞争激烈且与主业相关性较差的产业,可考虑适时退出。煤炭地勘单位只有把主业与相关产业有机统一起来,才能实现持续快速健康发展,才能保证煤炭地勘事业兴旺发达。  相似文献   

河南省南太行山旅游客源市场定位与营销策略研究     

王淑华 《地域研究与开发》2005,24(3):76-80

在实地调查的基础上,文章对南太行山区旅游客源市场现状进行了系统分析,认为该区旅游市场结构以国内游客占绝对优势;旅游者以中青年居多,其分布具有空间近距离性,行为特征表现为休闲观光比重大、散客多、逗留时间短等。针对这些特征,充分考虑南太行山旅游资源的特点、区位条件和旅游市场的发展趋势,规划了旅游市场的细分目标,并从形象营销、品牌营销、网络营销、绿色营销、整合营销等方面进行了针对性的市场营销扩展策略研究。  相似文献   

流体-地质力学耦合建模表征水力压裂诱发地震:以加拿大Fox Creek地区为例     

惠钢  陈胜男  顾斐 《地球物理学报》2021,64(3):864-875

随着水力压裂技术在页岩气开发中的广泛应用,加拿大西部盆地的诱发地震活动显著增加.目前对于诱发地震的综合表征方法还不成熟.本文采用一种综合地质、岩石力学及流体力学的研究方法,对Fox Creek地区2015年2月8日发生的M 3.0诱发地震事件进行了综合表征.首先,利用高分辨率三维反射地震资料,采用蚂蚁体追踪技术识别潜在断层.其次,利用测井曲线和压裂施工数据等资料定量求取岩石力学及地应力参数,建立三维地质力学模型,明确水力压裂缝的空间扩展规律.最后,建立流体-地质力学耦合模型,计算水力压裂过程中断层附近的孔隙压力及局部应力变化,利用摩尔-库仑破裂准则判定断层激活的时间与空间位置,揭示本次诱发地震事件的触发机制并提出风险控制对策.结果表明,三条由Precambrian基底向上延伸至Duvernay地层的近垂直断层在水平井压裂过程中被激活.由于水平井的部分压裂缝与断层沟通,注入流体沿断层的高渗透破裂带向下迅速扩散,在基底位置激活断层并诱发M 3.0地震事件.其中孔隙压力增加是本例中断层活化的主要因素.现场措施表明,增大压裂水平井与已知断层之间的距离被可以有效地降低地震风险.因此在进行水平井钻井及压裂作业之前,明确地下断层的分布位置至关重要.  相似文献   

非均衡发展战略在干旱区县域城镇体系规划编制中的实践——以内蒙古阿拉善左旗为例     

陈玲  谢正观 《干旱区地理》2007,30(2):301-306

干旱区城镇体系的发展强烈受制于区域特有的自然地理、资源、土地类型等自然约束条件,它们是人口、产业和城镇发展布局的地理基础。干旱区城镇体系构建的优化模式选择,应充分考虑区域的自然、社会经济特征以及区域的范围大小。在城镇体系规划编制过程中充分贯彻非均衡发展思想,重点发展中心城市和开发区,构建合理的“集聚型城镇体系”是符合干旱区的最佳选择。结合阿拉善左旗县域城镇体系规划编制进行分析,提出其未来区域城镇体系的发展应该坚持非均衡发展与优势区位优先开发的道路,通过功能分区、“轴线”的打造、“极点”的快速壮大加快空间集中化进程。  相似文献   

综合市情共享交换平台研究与实践     

李林  梁星  曹华强  王炜  李仕峰  柯沁君 《测绘与空间地理信息》2017,40(Z1)

随着大数据时代的到来,我国以城市为单位的社会公共信息资源共享面临机遇与挑战.目前获取数据的手段依然匮乏,政府部门是大数据的实际掌握者.本文研究了政府部门间数据共享交换的模式及策略,提出了文档资料、数据库、服务接口、空间文件4种共享模式以及"宽进严出"的共享策略,设计了综合市情共享交换平台的总体架构及关键技术,以SuperMap GEO-ESB技术为核心,实现了数据从共享、发布、应用到运维管理的全流程服务.  相似文献   

新经济时代的地球信息科学   总被引：7，自引：0，他引：7  

陈述彭 《地球信息科学学报》2000,2(3):1-4

扼要介绍近15年来,中国在空间数据采集和数据挖掘方面的新进展。提出地球信息科学面对知识创新,迎接新经济挑战与机遇的思路。特别探讨了有关地学信息图谱的新概念。  相似文献   

Sap flow and plant water sources for typical vegetation in a subtropical humid karst area of southwest China     

Xiangming Zeng  Xianli Xu  Ruzhou Yi  Feixia Zhong  Yaohua Zhang 《水文研究》2021,35(3):e14090

Plant water use plays a crucial part in the soil–plant-atmosphere continuum. However, in karst regions, plants frequently suffer from water shortages due to low soil water storage capacity. Therefore, it is necessary to understand plant water consumption (as determined by sap flow) and seasonal variation of water sources to improve water management in karst catchments. In this study, thermal dissipation probes (TDP), calibrated using empirical equations, were used to measure the sap flow of three typical woody vegetations, including Coriaria nepalensis (sparse-shrub), Toona sinensis (secondary forest) and Populus adenopoda (shrub-grass). Oxygen and hydrogen stable isotopes were used to analyze seasonal variation of plant water sources. The results showed that: (1) T. Sinensis (3.89 ± 3.87 L·day⁻¹) had significantly higher daily sap flow than C. nepalensis (0.33 ± 0.37 L·day⁻¹) and P. adenopoda (0.09 ± 0.12 L·day⁻¹); (2) daily sap flow was closely correlated to photosynthetically active radiation (PAR) and vapour pressure deficit (VPD); (3) over the entire study period, plants mainly used water from the surface soil horizons; and (4) a greater proportion of epikarst water was used for C. nepalensis than by T. sinensis and P. adenopoda over the whole growth stage, and more epikarst water was used in early and mid-growth stages compared to the late stage for the three species. This study contributes to a deeper understanding of the plant water use strategies in karst regions, and is helpful for ecosystem management.  相似文献   

瘦尾胸刺水蚤适应近岸多变环境的灵活摄食策略     

徐翠莲  胡思敏  郭志灵  李涛  黄晖  陈荔  刘胜 《海洋学报(英文版)》2020,39(2):59-68

Centropages tenuiremis is a species with a wide distribution range in disturbed coastal waters.However,due to a lack of dietary information,it remains unclear as to how they maintain such dominance in fluctuating conditions.In this study,C.tenuiremis was collected from the Daya Bay Nuclear Power Plant both in inlet and outfall regions at 06:00,12:00 and 18:00 on April 27,2011 and their in situ diet was analyzed using a PCR protocol targeting 18S ribosomal genes.Thirty-four species of prey organisms were identified totally,including Dinophyta,Baciliariophyta,Viridiplantae,Rhizaria,Apicomplexa,Chordata,Mollusca,Arthropoda and Fungi,indicating an obvious omnivorous feeding habit of C.tenuiremis.Centropages tenuiremis obviously exhibited spatial and temporal variations in diet composition.More plant prey(land plants and phytoplankton)were consumed in the morning(~50%),while more animal prey(metazoans and protozoans)were ingested at midday and night(60%–70%).Furthermore,a more diverse diet was detected in the outfall region(10–11 taxa),where the temperatures were relatively higher and more fluctuating,than in the control region(5–10 taxa).This finding indicated that C.tenuiremis could potentially expand its food spectrum under stressful condition.Specifically,C.tenuiremis exhibited phytoplankton preference(58.62%–67.64%)in the outfall region with a lower omnivory index(0.27–0.35)than in the control region(0.51–0.95).However,phytoplankton density was lower than that in the control region,suggesting a possible herbivorous tendency of C.tenuiremis under elevated temperatures to balance the energy acquirement and feeding effort.The flexible food choices of C.tenuiremis observed here could effectively buffer environmental fluctuations and might be an important survival strategy in coastal ecosystems.  相似文献   

中国应对多边投资协议谈判的策略研究     

张艾妮 《广东海洋大学学报》2009,29(2)

经济全球化使得在投资领域制订多边投资协议势在必行。无论是从国际投资领域面临的新形势,还是考虑到自身利益和国策看,中国都应把握主动,积极促成多边投资协议谈判。  相似文献   

GIS中矢量时空数据组织策略   总被引：1，自引：0，他引：1  

吴正升  郭健  刘松林 《测绘工程》2010,19(2):24-28

时态GIS作为GIS理论和技术研究前沿领域的一个难点问题越来越被重视。从实用角度出发,提出矢量时空数据组织策略,包括:时间精确到秒,用数字表示;离散变化用状态和事件来共同描述,而连续变化用事件来描述;现状/历史数据分离,空间/属性数据分离;时间标记在元组级上,空间数据采用非拓扑数据模型。在此基础上,将矢量时态层划分12种类型,详细设计其关系表组成和具体表结构。最后,设计和开发相应的实验系统,并以图斑数据和车辆轨迹数据为例验证相关策略的可行性。  相似文献