呷村矿床的微量元素特征及其找矿方向     

肖懿 《四川地质学报》1993,(3)

呷村含金富银多金属矿床属海相火山喷流-沉积矿床。本文从区域、矿田、矿床微量元素地球化学特征及异常模式研究入手,总结出本类矿床的最佳指示元素,建立了矿致异常元素的垂向分带和水平分带序列,指示了矿床的找矿远景和找矿方向。  相似文献   

哈密大南湖煤田含煤岩系煤层特征     

王宝成 《新疆地质》2006,24(2):153-156

以大量钻孔资料为基础,通过分析研究,对含煤岩系的含煤性作出评价,划分了3大含煤段,利用有效的对比方法和依据,对可采煤层进行全区对比分析,最后对全区煤层进行统一编号,为该区开矿及外围勘探提供宝贵的资料.  相似文献   

新疆斑岩铜矿成矿特征与综合找矿方法   总被引：2，自引：0，他引：2  

庄道泽  姜云辉  张红喜 《新疆地质》2007,25(1):40-48

斑岩铜矿是世界铜矿的主要类型之一.以新疆东天山土屋铜矿、阿尔泰山哈腊苏铜矿、西准噶尔包古图铜矿、西天山松树沟铜矿4个典型斑岩铜矿为对象,研究其矿床发现过程、成矿地质特征、地球物理特征、地球化学特征,探讨不同方法在矿床发现和评价阶段的作用,指出了斑岩铜矿典型地球化学元素组合和激发极化法在找矿评价中的作用.在此基础上提出了斑岩铜矿不同阶段找矿和评价方法组合.  相似文献   

Absolute Tilt from a Laser Guide Star: A First Experiment     

S. Esposito  R. Ragazzoni  A. Riccardi  C. O'Sullivan  N. Ageorges  M. Redfern  R. Davies 《Experimental Astronomy》2000,10(1):135-145

Absolute tip–tilt recovery using a tilt signal measured on a Laser Guide Star is a central problem in the framework of the development of Adaptive Optics Systems reaching full sky coverage down to visible wavelengths. In the past few years, various techniques aimed at solving this problemhave been proposed. However only a couple of these has been recentlytested in practice.We report about an experiment aimed at evaluating the performance of one of these techniques called the Elongation Perspective technique. Our experiment has been performed using the ALFA system inCalar-Alto (Spain) and involves the simultaneous operation of the 3.6 m and the 2.2 m telescopes at the Observatory.This article describes the telescope configuration used, as well as the datareduction process carried out in order to estimate the scientific objecttilt. The technique performances are discussed in terms of the residualtilt error variance and related correlation coefficient. The analysisshows that, despite the low SNR of our measurements, the atmospheric tiltvariance is reduced to 80% of its initial value corresponding to acorrelation coefficient of about 0.6. To get a betterestimate of the performance achievable using this technique,the tilt error variance due to photon noise in the laser measurementis estimated and removed from the obtained tilt error variance.When this correction is done, thisvariance is reduced to about 50% of its initial value, showingthat the use of this technique can give rise to a significant reduction of the scientific object image motion.  相似文献   

面向智能导游的室内外定位方法研究     

张翎  龙毅  余明朗  葛军莲 《地理信息世界》2015,(2):21-25

智能导游是基于游客位置的路径引导、游览讲解的综合性服务,与地理信息系统(GIS)、移动定位技术、基于位置的服务(LBS)等之间有着密切的联系。目前,室外定位技术已趋于成熟,但是无法满足室内定位的要求,因而室内外一体化定位在智能导游领域的应用亟待研究。本文将室内外定位引入到景区智能导游服务中,在调研室内外定位技术的基础之上,根据景区智能导游系统中室内外定位的具体需求,研究基于全球定位系统(GPS)和超宽带技术(UWB)的室内外组合定位方法,提出基于游客行为与空间状态的室内外组合定位模式,通过探测游客的运动状态实现定位切换算法,构建基于GPS与UWB的室内外组合定位平台。  相似文献   

The mechanism of slope instability due to rainfall-induced structural decay of earthquake-damaged loess   总被引：1，自引：0，他引：1  

Hu Tao  Mengmeng Zhang  Li Gong  Xi Shi  Yijie Wang  Guoqiang Yang  Shaowei Lei 《地震研究进展（英文）》2022,2(3):100137

Natural loess slopes are characterized by a strong geological structure, which is an important factor in maintaining slope stability. The magnitude and duration of the earthquake may disturb the soil structure at different levels degrees, locally changing the arrangement between soil particles. The process of rainfall humidification weakens the cementation between soil particles, and the disturbance and humidification change the structural state of the soil, which in turn causes sliding of the slope along with the decay of soil mechanical properties. As slope instability is often the result of a series of post-earthquake ripple effects, it is of great scientific significance to study the mechanism of slope instability due to the structural decay of earthquake-damaged loess exacerbated by rainfall. In this paper, the impact of structural decay of loess on slope stability is simulated by GEOSTUDIO software under three conditions: pre-earthquake rainfall, post-earthquake rainfall and earthquake, taking the landslide in Buzi Village, Min County, Gansu Province as an example. The comparative analysis of the calculation results shows that the structural properties of the slope without earthquake disturbance are influenced by infiltration amount. When it is fully saturated, the structural properties are similar to those of saturated soil, and the safety factor is reduced by 12.9%. In addition, the earthquake intensity and duration have different degrees of structural damage to the soil. When the structure is fully damaged, it is similar to that of remodelled soil, and the safety factor is reduced by 45.84%. Notably, the process of the earthquake and the following humidification generates the most serious damage to the loess structure, with a reduction in the safety factor of up to 56.15%. The quantitative analysis above obviously illustrates that the post-earthquake rainfall causes the most severe damage to structural loess slopes, and the resulting landslide hazard should not be underestimated.  相似文献   

基于网页旅游攻略的旅行线路规划     

陆川伟  孙群  郭健  李爱光  彭泽峰 《测绘学报》2015,(Z1)

为帮助旅行者规划旅行线路,以旅游攻略为数据源,针对旅行线路规划问题中可选景点的动态性问题,根据传统车辆路径问题求解方法中两阶段法的先分组再定路线的策略,重点研究并设计改进了一种基于攻略中景点出现频率的先分组再定路线的启发式旅行线路规划策略用于自动规划旅游行程。试验结果表明,使用本文所提出的方法生成的旅游线路,时间分配更加合理,游览的景点间路程更短,线路的游览时间与景点间距离的费效比更高,对于游客规划旅行线路有着很大的现实意义。  相似文献   

扬州市6-7月份天气预报服务业务化系统     

于庚康  刘方  钱余根  朱建国  秦铭荣 《气象》1994,20(2):28-32

从地（市）级气象台的业务工作出发,试图建立能过微机实现的对上接收信息,对外预报服务,对下预报指导的三位一体的天气预报服务业务化系统,以发挥地（市）级气象台在经济建设和防灾减灾中的作用,推动天气预报和服务的现代化建设,把基层气象工作推向一个新的台阶。  相似文献   

多煤层开采覆岩破断过程的模型试验与数值模拟   总被引：4，自引：1，他引：3  

夏筱红  隋旺华  杨伟峰 《工程地质学报》2008,16(4):528-532

首先分析了研究区煤矿山西组煤层剖面和水文地质特征,针对多煤层联合开采的特点和覆岩的工程地质特征,采用工程地质力学模型实验、数值模拟计算相结合的综合研究方法,分析了多煤层开采的采动影响及岩层动态断裂机理,得出了有关岩层移动参数和多层煤同采时应力分布状态,计算得到了多煤层开采垮落带与导水裂隙带的发育高度分别为32m和81.5m,导水裂隙带高度影响范围已经达到风化带,未形成切冒,局部穿透粘土层。  相似文献   

用于自适应光学系统的激光引导星   总被引：2，自引：0，他引：2  

熊耀恒 《天文学进展》2000,18(1):1-8

自适应光学系统应用于天文观测时应满足一些技术要求,其中的关键技术之一是自适应光学系统为了对畸变的光波进行采样,需要在其很小的等晕角内有足够的信标强度。激光引导星,即人造信标,就是解决这种问题的方法之一。特别是在观测天文暗目标时,其自身的光强度不能为有探测提供信息,激光引导星就蛤得非常重要。根据国际上的最新进展对激光引导星技术给予了介绍。重点介绍了激光引导星的局限性,对近几年提出的对激光引导星可能的  相似文献