地震勘探在东兴盐矿的应用     

邵爱武  杨甦 《安徽地质》2010,20(3):222-225,240

在安徽定远东兴盐矿勘探中,通过采用地震反射波法与钻孔的对比分析,充分说明地震反射波法在第三系地层中寻找石膏矿、岩盐等沉积型矿藏有着良好的应用前景。  相似文献   

火箭人工增雨作业中应注意的一些技术问题   总被引：1，自引：0，他引：1  

徐冬英 《气象研究与应用》2014,35(3):85-89

根据火箭增雨作业的原理对催化剂播撒量、成核率与火箭飞行速度和高度的关系进行分析;确定作业目标、时机和部位、作业火箭用量;对增雨效果、火箭播云对环境的影响进行评估。  相似文献   

都江堰市龙池镇黄央沟泥石流特征与防治工程效果分析     

曾庆铭  薛强  徐继伟 《西北地质》2014,(3):192-199

黄央沟位于"5.12"汶川地震的极重灾区四川省都江堰市龙池镇,地震使沟内山体发生大规模的滑坡和崩塌,其为泥石流的形成提供了丰富的松散固体物质。地震后黄央沟泥石流十分活跃,2010年8月13日、8月18日和2013年7月9日均暴发了泥石流,造成了严重的经济损失。笔者通过对黄央沟泥石流灾害现场进行实地调查,详细分析了黄央沟泥石流的形成条件和发育特征,并对已有防治工程效果进行了分析和探讨。针对防治工程存在的问题和黄央沟泥石流的特点,建议在沟道下游和堆积区修建排导沟,使泥石流顺畅排入龙溪河;采取工程和生物措施来稳定沟道内的崩滑堆积体和不稳定斜坡,减少泥石流物源;沟口公路采用高架桥跨越方式通过泥石流堆积扇。该研究结果可为强震区泥石流灾害的防治提供参考。  相似文献   

四川盆地下寒武统膏盐岩发育特征与封盖有效性分析   总被引：2，自引：0，他引：2  

林良彪  郝强  余瑜  淡永  彭勇民 《岩石学报》2014,30(3):718-726

四川盆地下寒武统广泛发育一套膏盐岩,主要沉积于早寒武世龙王庙期。基于四川盆地深井及实测剖面中膏盐岩的识别和统计,发现下寒武统有川南和鄂西两大聚盐区,最厚达690.40m;川南聚盐区西部以含泥含云质石膏岩类和含膏砂泥岩类为主,东部及颚西聚盐区主要为含膏白云岩类。结合前人研究,认为膏盐岩发育于浅水缓坡沉积环境,有潮上萨布哈和缓坡蒸发两类成因。通过对川南聚盐区储盖匹配关系及后期构造与膏盐岩封盖性分析,表明下寒武统膏盐岩与盐下震旦系优质的白云岩储层在空间上具有良好的匹配关系;四川盆地边界大断裂及边界外寒武系的抬升暴露让膏盐岩在盆地外封盖性失效,而在盆地内膏盐岩的封盖性较好。威远气田解剖表明有膏盐岩分布的威远地区成藏,而无膏盐岩分布的资阳地区气藏被破坏,显示了下寒武统膏盐岩在四川盆地油气成藏中具有重要的作用。  相似文献   

Key Problems and Countermeasures in CO₂ Flooding and Storage     

CHEN Huanqing 《《地质学报》英文版》2023,97(3):858-872

Based on literature research in combination with the practice of CO₂ flooding and storage in Jilin Oilfield, this study assesses the key problems in CO₂ flooding and storage, proposing the corresponding countermeasures from five aspects of CO₂ gas source condition, namely geological condition evaluation, scheme design incoordination with other production methods, economic and effectiveness evaluation, together with dynamic monitoring and safety evaluation. The re...  相似文献   

不同风格旅游网络地图点状符号有效性眼动实验研究     

林勇  邓毅博  赖小云  周国众 《测绘与空间地理信息》2015,(2):58-62

地图新显示载体的出现,要求制图者不能继续沿用纸质地图符号的设计原则进行符号设计.以旅游网络地图点状符号设计为例,在对单个点状符号进行认知实验的基础上,将符号成图可视化显示,应用眼动跟踪技术,采用统计学的样本标准偏差方法分析被试者阅读地图的眼动数据分布状态,从易学性、地图信息易获取性、易记性等三个指标评估点状符号的有效性,从而得到点状符号设计改进原则,为旅游网络地图设计提供了参考依据.  相似文献   

基于倾向得分匹配方法的中国自然保护区缓解人类活动压力评估     

张涵  黎夏  石洪  刘晓娟 《地理学报》2021,76(3):680-693

科学地评估自然保护区缓解人类活动压力的效果,对于有效的自然保护至关重要。目前中国国家尺度下的这方面研究,仅将保护区内、外的人类活动压力进行对比,其缺陷是样本选择性偏差会导致评估结果的不合理。本文选择了倾向得分匹配（Propensity Score Matching）方法来克服保护区评价中的样本选择性偏差问题。首先耦合多源数据构建了2013年、2015年、2017年的人类活动压力指数,然后采用倾向得分匹配方法对自然保护区内、外的随机点进行匹配,使两个对比组的观测变量尽可能相似。最后通过相对有效性指标和面板模型从不同层面评估了中国680个自然保护区在2013—2017年间缓解人类活动压力的效果。研究结果表明：① 2013—2017年,全国86.72%的自然保护区内人类活动压力指数呈现上升趋势,其面积占保护区总面积的43.80%。② 69.85%的自然保护区在缓解人类活动压力方面的效果较好。其中,除了海洋海岸、野生植物、野生动物类的保护区以外,其余保护区类型都表现出较好的缓解人类活动压力的效果,且保护区级别越高,保护效果越好。③ 中国自然保护区建设在2013—2017年间能缓解22.90%的人类活动压力,且保护区缓解人类活动压力的能力存在区域性差别。本文研究结果可为中国自然保护区监测、评估和管理提供更科学的参考依据。  相似文献   

高校测绘工程专业“测量仪器学”课程的改革与实践     

余腾  胡伍生  周立  焦明连  孙小荣 《测绘通报》2017,(5)

针对测量仪器不断发展和革新的实际情况,总结了近5年来"测量仪器学"课程开设的效果和社会评价。基于测量仪器已全面进入电子智能时代,提出了针对理论和实践两个方面教学内容的改革,改进得到了优化新颖的教学方法,对于课程考核提出了合理的评判方法,并对课程配套相关条件提出了合理的建议,最后对改革后的课程教学效果进行了论述和分析。  相似文献   

Effectiveness of pilot carbon emissions trading systems in China     

Zhe Deng  Dongya Li  Tao Pang 《Climate Policy》2018,18(8):992-1011

China is in the process of establishing a national emissions trading system (ETS). Evaluating the implementation effectiveness of the seven pilot ETSs in China is critical for designing this national system. This study administered a questionnaire survey to assess the behaviour of enterprises covered by the seven ETS pilots from the perspective of: the strictness of compliance measures; rules for monitoring, reporting and verification (MRV); the mitigation pressure felt by enterprises; and actual mitigation and trading activities. The results show that the pilot MRV and compliance rules have not yet been fully implemented. The main factors involved are the lack of compulsory force of the regulations and the lack of policy awareness within the affected enterprises. Most enterprises have a shortage of free allowances and thus believe that the ETSs have increased their production costs. Most enterprises have already established mitigation targets. Some of the covered enterprises are aware of their own internal emission reduction costs and most of these have used this as an important reference in trading. Many enterprises have accounted for carbon prices in their long-term investment. The proportion of enterprises that have participated in trading is fairly high; however, reluctance to sell is quite pervasive in the market, and enterprises are mostly motivated to trade simply in order to achieve compliance. Few enterprises are willing to manage their allowances in a market-oriented manner. Different free allowance allocation methods directly affect the pathways enterprises take to control emissions.

Key policy insights

• In the national ETS, the compulsory force of ETS provisions should be strengthened.

• A reasonable level of free allowance shortage should be ensured to promote emission reduction by enterprises.

• Sufficient information should be provided to guide enterprises in their allowance management to activate the market.

• To promote the implementation of mitigation technologies by enterprises, actual output-based allocation methods should be used.

• The government should use market adjustment mechanisms, such as a price floor and ceiling, to ensure that carbon prices are reasonable and stable, so as to guide long-term low carbon investment.

  相似文献   

Modelling of pile wave barriers by effective trenches and their screening effectiveness   总被引：2，自引：0，他引：2  

S. E. Kattis  D. Polyzos  D. E. Beskos 《Soil Dynamics and Earthquake Engineering》1999,18(1):78

The three-dimensional problem of isolation of vibration by a row of piles is studied numerically on the basis of a model replacing the row of piles by an effective trench in order to reduce the modelling complexity. The analysis is accomplished with the aid of an advanced frequency domain boundary element method, which is used for both the infilled trench and the soil medium in conjunction with a coupling procedure based on enforcement of equilibrium and compatibility at the trench–soil interface. Linear elastic or viscoelastic material behaviour is assumed for both the piles and the soil. The piles can be tubular or solid and have circular or square cross-section. The vibration source is a vertical force, harmonically varying with time, and the row of piles acts as a passive wave barrier. The effective trench model is constructed by invoking well known homogenization techniques used in the mechanics of fibre-reinforced composite materials, and its accuracy is compared against a rigorous boundary element analysis modelling each pile separately in full contact with the soil medium. On the basis of the effective trench model, the screening effectiveness of a row of piles is studied through parametric studies.  相似文献