桐柏盆地高精度重磁勘探的地质效果   总被引：1，自引：0，他引：1  

吴蓉元  李忠 《地球科学》1992,17(1):69-78,T003

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SEDIMENT PROBLEMS AT DUJIANGYAN PROJECT     

Xu Muju 《国际泥沙研究》1990,(2)

1. THE GEOGRAPHICAL ENVIRONMENT AND HISTORICAL PERSPECTIVE OF THEPROJECTIn the western part of Sichuan Basin, between the Longmen Mountain in the west and theLongquan Mountain in the southeast, lies an alluvial plain of 6500 kmZ formed by the Minjiang Riversystem known as the Chengdu Plain. With its mild climate (average annual temperature 16' 4 C ),fertile soils, rich water resources, and the densely interconnected system of Minjiang and TuojiangRivers, Chengdu …  相似文献   

Global Mapper和91卫图软件在地质调查前期工作中的组合应用     

刘运锷  李莉 《矿产与地质》2016,(6):1018-1023

在地质工作和测量程度低的地区开展地质调查工作时,由于缺乏基础资料,在工作设计及野外施工等方面极其不方便.本文利用91卫图助手软件免费下载工作区地形和影像数据,使用Global Mapper对该数据进行分析处理,并结合MapGIS软件能快速绘制出调查区的一系列基础图件如地形等值线图、测区沟系图、测区影像图等.在此基础上,使得测区的地质工作路线安排、化探沟系次生晕野外采集点布置更加方便,从而节约了成本,并提高了工作效率.  相似文献   

A major change in the phytoplankton of a Swedish sill fjord—A consequence of engineering work?     

H.L. Filipsson  G. Bjrk  R. Harland  M.R. McQuoid  K. Nordberg 《Estuarine, Coastal and Shelf Science》2005,63(4):551-560

A major phytoplankton change occurred during the late 1930s and early 1940s in Koljö Fjord, a sill fjord on the Swedish west coast. Dinoflagellate cyst concentrations increased tenfold over a short period of time, from hundreds of cysts per gram sediment to thousands; and the species composition of both dinoflagellate cysts and diatoms changed markedly. These changes took place during a period of extensive engineering work at the entrance to the fjord from the Skagerrak. At this time, the entire passage was straightened, a new channel was built in a previously shallow area, and the old connection was closed. This study investigates whether this engineering work could have sufficiently altered the surface-water circulation to bring about the change in the phytoplankton composition. Several mechanisms are explored by which the construction could have influenced the phytoplankton in the fjord. The primary mechanism is probably increased efficiency of tidal-generated surface-water exchange in the fjord, resulting in a larger transport of surface water from the Skagerrak and consequently a changed surface-water environment. This study highlights how engineering work can have a substantial impact on the local and regional marine environment, a factor that must not be overlooked in environmental planning.  相似文献   

Second‐order work analysis for granular materials using a multiscale approach     

François Nicot  Nejib Hadda  Félix Darve 《国际地质力学数值与分析法杂志》2013,37(17):2987-3007

It has been established that the second‐order work criterion is a general necessary condition for all instabilities by divergence in rate‐independent granular materials. The relation between the values of discrete second‐order work at the intergranular contact point level and its global macroscopic value is recalled at the beginning of this paper. Then, the basic purpose of the paper is tackled by an analysis of the main features of second‐order work criterion in relation with the granular microstructure. For that, it is considered a novel micromechanical model (the so‐called ‘H‐microdirectional model’), which has the property to involve three scales: grain scale, mesoscale with a specific granular configuration and continuum mechanics macroscale. Eventually, these exhibited features (a bifurcation stress domain and some instability cones) are qualitatively compared with the ones provided by direct numerical simulations issued from a discrete element model. The ultimate goal is to analyse what happens at the granular scale, when the macrosecond‐order work is vanishing at the macrolevel. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

Is being in work good for wellbeing? Work Integration Social Enterprises in regional Australia     

Katharine McKinnon  Melissa Kennedy  Jo Barraket  Tracy DeCotta 《The Australian geographer》2020,51(3):361-375

ABSTRACT

Work Integration Social Enterprises (WISE) offer supported work environments for people experiencing disadvantage, including people with disability. This paper reflects on a research project that is mapping the ways in which social enterprises in regional Australian cities produce wellbeing for their employees. Through supported employment programs, these organisations are transforming individual lives, helping to build a sense of self-worth and purpose, and increase individuals’ social skills and capacities. Many of the perceived benefits are associated with a belief in the innate good of paid work. Based upon interviews with employees in the social enterprises, it is apparent that the hopes attached to providing ‘meaningful work’ are considerable. At the same time social enterprises are taking on social responsibilities that were once provided by the state, while also selling their services as employers of disabled and disadvantaged members of society and maintaining commercial viability of the enterprise. Using feminist political economy alongside discussion of the distributive economy, this paper explores how contemporary policy conditions, productivist biases and normative discourses about the value of wage work inflect the forms of wellbeing that can be experienced by WISE workers.  相似文献   

中国地质工作转型升级中的资金投入特征     

姜杉钰  王峰  樊笑英 《地质论评》2022,68(6):2022112003-2022112003

通过对当前地质工作转型升级时期的资金投入分析,梳理了财政投入和社会资金的现状特征和问题,进而提出了对策建议。研究结果显示,中国的地质工作正处于转型升级期,在资金投入上主要表现出资金投下滑总体趋势放缓、矿产勘查资金供需矛盾突出、新旧动能转换引领投资分化、科技和信息化投入仍需提升、投入空间格局正发生转变五大特征。研究认为,为进一步优化资金投入以适应新的发展形势,应该以中长期战略引领投资布局,强化两级财政的协同配合,多措并举吸引社会资本注入,完善财政投入评估调整机制。  相似文献   

CASS 8.0在绘制地质工作部署图坐标转换中应用     

徐阳 《地质与勘探》2021,57(5):1127-1135

针对多金属矿勘探中测点坐标的批量生成过程步骤繁琐的问题,文中提出了一种利用CASS8.0直接生成1:1万高精度磁法勘探测点及1:1万激电中梯探测测点坐标的思路。通过利用现有地形地质图以及专业绘图软件CASS8.0在制图及坐标转换方面的优越性,直接生成可以应用于手持GPS测量仪的数据格式文件和绘制出可以用于野外找点的地形地质图,达到测绘坐标点在地图上快速导入导出的效果。在内蒙古自治区额济纳旗黑鹰山南区铅多金属矿普查项目的工作中,针对工区面积大,地形复杂,在工作部署中,需要布置探测点数量庞大,采用原始方法计算并人工将每个测点坐标输入手持GPS定位仪中的工作量大且极易出错,探测点点位不能根据实际地形合理规避危险区域或者障碍物（悬崖、峭壁等）等问题,通过利用黑鹰山南区铅多金属矿普查区地形地质图及CASS8.0绘图方面的优越性,批量对工作部署图中测点进行定位编号并调整,从CASS8.0导出坐标数据点并导入天宝R4 GPS手持定位仪中的方法,避免了人工输入数据出错的问题,合理规划了探测路线,提高工作效率,保障了工作人员的生命安全,该应用表明,此方法在工作部署图绘制中更加直观、方便,解决大面积比例尺工作部署图坐标导出导入问题,并且效率极高,在工作中取得了较好的效果。  相似文献   

海上风电勘探装备研发与应用          下载免费PDF全文

许启云  牛美峰 《探矿工程》2021,48(9):107-110

配置合理的海上风电勘探装备,对海上风电地质钻探至关重要,而配置合理、功能齐备的海上风电勘探平台更是重中之重。为了提升35 m以上水深海上风电勘探作业工效、安全、精度,本文主要从平台运维功能和勘探功能设计为切入点,针对性地开展了平台主要技术规格、升降操控系统、场区设计、现场土工试验室等方面的海上风电勘探自升式勘探平台装备的功能设计与研究,研发了具备双孔勘探能力的自升式勘探平台,并在投产运营2年中,取得了良好的使用效果,勘探工效、安全性大大提升,达到了研发的目标,为海上风电勘探提供了有力的装备支撑。  相似文献   

益阳市赫山区砖瓦用粘土矿企业执法工作浅析     

黄志刚  曾毅 《国土资源导刊(湖南)》2015,(1):71-74

本文分析益阳市赫山区全区砖厂数量多、分布密、产能低、污染大,部分已没有可开采资源的现状;分析砖厂办理采矿许可证延续手续主动性不高和砖厂难以关停的原因;介绍在砖厂执法工作中的几点经验做法。  相似文献