ROCK-600型钻机在小秦岭金矿田勘探中的应用          下载免费PDF全文

翟新建  李大鹏 《探矿工程》2019,46(9):94-98

ROCK-600型钻机是一款适合地质勘查需求的便携式钻机,适用于金刚石绳索取心等多种钻探工艺方法。以河南省小秦岭金矿田观音峪矿区钻探施工为例,介绍了ROCK-600型钻机的使用情况,根据矿区地层条件及钻孔设计要求,合理地选择了钻压、转速及泵量,提高了钻进效率,并对钻机在钻进作业过程中存在的不足提出了一些改进建议,以便该钻机能在不同矿区应用中发挥更大的作用。  相似文献   

Experimental study on reduction of U (VI) by an anaerobic bacterium, Shewanella putrefaciens: Application to sandstone-hosted interlayer oxidation-zone type uranium deposits, China     

L.L.Barton 《中国科学D辑(英文版)》2005,(3)

A lot of fossil bacteria and algae, which were re-placed by uraninite ( pitchblende), were first found inthe ores when the authors studied the sandstone-hostedinterlayer oxidation-zone type uranium deposits innorthwest China[1,2]. It is known that a powerful radia-tion from the uranium ores is harmful and, evendeadly to any life, including microorganism. Whatmechanism does this inconceivable fact result from?Up to the present time in China, there has been no ex-perimental investigation on red…  相似文献   

The critical state parameters of sands from their image-based intrinsic properties     

Jia  Jian  Zheng  Junxing  Sun  Xinjian 《Acta Geotechnica》2021,16(12):4081-4092

Acta Geotechnica - It has been well established that critical state behavior of granular soils is controlled by their intrinsic properties. The critical state behavior is quantified by strength...  相似文献   

库车前陆冲断带横断层发育特征及其形成机制          下载免费PDF全文

王伟锋  王乾  单新建 《中国地质》2018,45(3):493-510

横断层是指走向与主构造走向线直交或大角度相交的伴生断层,在冲断带中普遍存在且具有一定的研究意义。库车前陆逆冲带是中亚地区典型的逆冲褶皱带,是经历多期构造形成的再生前陆盆地,具备发育横断层的构造基础。结合前人资料,通过对地貌遥感影像、深部物理资料以及地震勘探等资料的分析解译,对库车前陆冲断带的横断层构造特征、形成机制以及地质意义进行了探讨。通过研究发现:(1)库车前陆冲断带存在16条主要横断层(组),其中9条横断层结构及性质确定,总体来看主要分布在北部单斜带、克拉苏构造带以及秋里塔格构造带;(2)依照形成机制,研究区横断层可以分为基底断裂活化型走滑横断层、盖层撕裂型走滑横断层以及盐上张性横断层三大类;(3)横断层在调节冲断带不同段逆冲差异、横向河流发育、丰富构造样式以及控制油气运移等方面具有一定的地质意义。  相似文献   

Does Ski Tourism Improve the Regional Economy? The Case Study of Chongli,China     

WANG Zhe  JIANG Yiyi  LI Xinjian  WANG Ning  ZHANG Yue 《资源与生态学报(英文版)》2022,13(4):603-612

Chongli is one of the venues for the Beijing 2022 Winter Olympics. Since 2009, the government of Chongli has emphasized the development of a tourism strategy, which gradually contributed to alleviating regional poverty. With data collected from 2009 to 2019, ski tourism and the regional economy in Chongli were analyzed using the Coupling Coordination Degree (CCD) Model. This analysis indicated, first, there were three stages in the relationship between ski tourism and the regional economy in Chongli, including weak coordination (2009-2011), starting coordination (2012-2015), and strong coordination (2016-2019). Second, sport tourism, such as ski tourism, is likely to contribute to the regional economy and alleviate poverty. Third, the case of Chongli illustrates that policy and sports events are significant for helping a place to develop sports tourism, in addition to making full use of local resources. Finally, the development of skiing tourism has had a positive impact on citizens’ and farmers’ incomes, though it may have impacted citizens more. This research suggests that regional resources are essential for the development of sport tourism and the promotion of regional economies. Developing regions should seize the bonus period of sports events and policies. More attention should be paid to the differences between urban citizens and farmers in order to establish a better redistribution system. Considering the climatic factors, more studies need to analyze the sustainability of ski tourism in developing regions.  相似文献   

Ore-bearing Formations and Mineral Resource Prospects of the Peripheral Areas of the Tarim Block     

HE Jurui  RUI Xinjian  GUO Kunyi  WU Quanhuai  LIU Hongying  Nanjing Institute of Geology  Mineral Resources  Geological Survey of Chin  East Zhongshan Rd.  Nanjing  JiangsuWANG FutongBureau of Geology  Mineral Resources Exploration  Development of Xinjiang  Urumqi  Xinjiangand SUN ChuanminChengdu Institute of Technology  Chengdu  Sichuan 《《地质学报》英文版》2000,74(3):473-477

The tectonic development of the Tarim block has experienced four stages, i. e. Earth's core accretion and block formation in the Precambrian, margin splitting, opening-closing and piecing up in the Early Palaeozoic, rift formation and plate unification in the Late Palaeozoic, and basin-mountain coupling and landform shaping in the Meso-Cenozoic, forming six ore-bearing formations and ore deposits of various genetic types in the Tianshan Mountains, Kunlun Mountains and Altun Mountains. In the peripheral areas of Tarim there are four giant intercontinental metallogenic belts passing through, the Central Tianshan and southwestern Tianshan belts in the former USSR and the Qinling-Qilian-Kunlun and Palaeo-Tethys belts in China. According to the macro-analysis on the nearly one thousand known deposits (occurrences) and geophysical-geochemical anomalies, and the information from reconnaissance in some areas, the region has very good prospects for mineral resources. Some of the metallogenic belts may well becom  相似文献   

计算结构首次穿越时间概率密度函数的新方法     

郑春林  陈婕  何军  寇新建 《地震工程与工程振动》2006,26(4):52-55

本文在M adsen等提出的积分方程方法基础上,采用单点FORM方法计算结构首次穿越问题中的条件穿越率、联合穿越率及首次穿越时间概率密度。提出的新方法计算简单,结果精确,适于进行脆性结构的首次穿越破坏分析。  相似文献   

网湖似剌鳊鮈年龄与生长的研究     

龚世国  宋智修  胡新建  刘代林  陈敬德 《湖泊科学》1996,8(3):253-259

对湖北省阳新县网湖所采得的862尾似刺鳊鮈的年龄与生长的研究表明,其年轮特征主要为切割型和碎裂型。其体长与鳞径呈直线相关:L=5.6784+4.3056R;体长与体重呈幂函数的增长关系:W=2.8026×10~(-2)L~(2.8754)。应用Van Bertalanffy生长方程拟合该鱼的一般生长规律,其生长参数为:L_∞=25.0143cm,W_∞=277.8876g,K=0.4668,t_0=-1.3886,拐点年龄t_i=1龄,拐点体长L_i=16.42cm,拐点体重W_i=82.82g。  相似文献   

基于地震资料有效信息约束的深度网络无监督噪声压制方法     

陈文超  刘达伟  魏新建  王晓凯  陈德武  李书平  李冬 《煤田地质与勘探》2021,49(1):249-256

地震资料处理是地震勘探中的关键环节,由于地下构造和地表条件的复杂性,地震资料的处理需要经过一系列复杂流程,从而形成多种不同类型的地震数据。不同种类的地震数据具有不同的数据特征,充分利用和发掘其中的数据特征,不仅可以充分发挥处理方法的技术潜力,消除各类非地质因素对地震资料处理质量的影响,同时可以增强地震资料处理的可靠性,改善地震资料的资料信噪比及分辨率,在复杂油气藏勘探开发中具有非常重要的基础作用。叠前地震成像道集（CRP）中的有效信号同相轴近似水平,叠后地震成像数据因为地层沉积的规律性,有效信号相比于随机噪声、成像画弧噪声等干扰具有规律、简单等特点。具体表现为CRP道集及叠后地震资料有效信号具有多尺度自相似性的特征,其高维Fourier （FK或FKK）域主要能量集中在低频、低波数区域。针对上述地震数据的特点,提出一种基于先验信息约束的深度网络地震资料无监督噪声压制方法。受到深度图像先验（DIP）的启发,神经网络的结构可以视为一种特殊的隐式先验信息,合理设计网络结构可以使得网络具有多尺度自相似性特征的提取能力。由于叠前地震成像道集数据和叠后地震成像数据有效信号的多尺度自相似性,而噪声不具备这一特性,因此,特定结构的网络可以从原始数据提取出有效信号,从而达到噪声压制的目的。叠前成像道集和叠后成像的实际数据随机噪声压制试验结果表明,本文方法具有良好的保真性与鲁棒性。此外,由于本文方法具有强大的特征提取能力,因此,对常规方法不易压制的弧状成像噪声也有良好的效果。   相似文献   

Comprehensive evaluation of urban flood-bearing risks based on combined compound fuzzy matter-element and entropy weight model     

Lv  Hong  Guan  Xinjian  Meng  Yu 《Natural Hazards》2020,103(2):1823-1841

The extreme precipitation events caused by climate change and the rapid development of urbanization have brought hidden flood risks to the cities. This paper comprehensively considered two major factors of vulnerability of urban flood-bearing and disaster prevention and mitigation (DPAM) capacity and built a comprehensive evaluation index system for urban flood-bearing risks. Secondly, a combined model consisted of composite fuzzy matter-element and entropy weight model was constructed to calculate the comprehensive risk indicator. Finally, the Zhengzhou City was taken as an example, the comprehensive indices of urban flood-bearing risk from 2006 to 2015 were evaluated. The results showed that the comprehensive risk of Zhengzhou City was generally on a slow upward trend, from II level (moderate-risk) in 2006 to III level (secondary high-risk) in 2015, which was mainly due to the mismatch between the rapid development of urbanization and the slow improvement of DPAM capabilities. This paper is expected to provide scientific reference and technical support for urban flood disaster prevention and sponge city construction.

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