云南维西格坡洛斑岩型锑矿矿床成因     

蒋志荣  罗显辉 《云南地质》2009,28(3):259-262

锑矿化集中于喜马拉雅期石英斑岩内接触带,存在矿源层形成、充分分异及近地表成矿三个阶段。可作为滇西碱性岩锡矿床典型。  相似文献   

Ranking spaces for predicting human movement in an urban environment     

Bin Jiang 《International journal of geographical information science》2013,27(7):823-837

A city can be topologically represented as a connectivity graph, consisting of nodes representing individual spaces and links if the corresponding spaces are intersected. It turns out in the space syntax literature that some defined topological metrics can capture human movement rates in individual spaces. In other words, the topological metrics are significantly correlated to human movement rates, and individual spaces can be ranked by the metrics for predicting human movement. However, this correlation has never been well justified. In this paper, we study the same issue by applying the weighted PageRank algorithm to the connectivity graph or space–space topology for ranking the individual spaces, and find surprisingly that: (1) the PageRank scores are better correlated to human movement rates than the space syntax metrics, and (2) the underlying space–space topology demonstrates small world and scale free properties. The findings provide a novel justification as to why space syntax, or topological analysis in general, can be used to predict human movement. We further conjecture that this kind of analysis is no more than predicting a drunkard's walking on a small world and scale free network.  相似文献   

Monitoring disasters with a constellation of satellites – type examples from the International Charter ‘Space and Major Disasters’     

Ahmed Mahmood 《国际地球制图》2013,28(2):91-101

In the case of a major disaster, information derived from satellite observation is not only highly useful, it may at times be indispensable because of the damage caused by the disaster to ground infrastructure. The International Charter ‘Space and Major Disasters’ (‘the Charter’) has been one of the primary sources of satellite data for the past 11 years to cover events like floods, fires, tsunamis, ocean storms, earthquakes, volcanic eruptions and oil spills. With the growing membership of the Charter, an increasingly large number of sensors are now available, which can be planned with the required temporal frequency and spectral range to cover a disaster event. Some of the type Charter activation cases are reported in this article to demonstrate the innovative use of multi-satellite imagery for disaster response.  相似文献   

Space,time, and situational awareness in natural hazards: a case study of Hurricane Sandy with social media data   总被引：1，自引：0，他引：1  

Zheye Wang 《制图学和地理信息科学》2013,40(4):334-346

ABSTRACT

Various methods have been developed to investigate the geospatial information, temporal component, and message content in disaster-related social media data to enrich human-centric information for situational awareness. However, few studies have simultaneously analyzed these three dimensions (i.e. space, time, and content). With an attempt to bring a space–time perspective into situational awareness, this study develops a novel approach to integrate space, time, and content dimensions in social media data and enable a space–time analysis of detailed social responses to a natural disaster. Using Markov transition probability matrix and location quotient, we analyzed the Hurricane Sandy tweets in New York City and explored how people’s conversational topics changed across space and over time. Our approach offers potential to facilitate efficient policy/decision-making and rapid response in mitigations of damages caused by natural disasters.  相似文献   

东川汤丹铜矿矿权实地核查数据检查方法     

廖志坚  杨艳  杨静远  杨舒然  周海 《云南地质》2012,(2):259-262

对东川区汤丹铜矿矿业权实地核查中,单矿业权成果数据容易出现的问题进行分析研究,总结出矿业权实地核查单矿权数据检查的方法与重点。  相似文献   

CSAMT法在四台矿402盘区陷落柱构造探测中的应用   总被引：10，自引：7，他引：10  

于昌明  高宇平 《地球物理学进展》1996,11(2):137-147

可控源音频大地电磁法应用于寻找煤田落陷落柱构造，乃是个新课题。通过对大同矿务局四台矿４０２盘区的野外实际应用，发现了两个陷柱落构造，与实际资料基本吻合。  相似文献   

中国与基性—超基性岩有关的Cu－Ni（Pt）矿床成矿系列类型   总被引：2，自引：0，他引：2  

汤中立  李文渊 《甘肃地质》1996,(1):52-60,62,66

中国与基性—超基性岩有关的Ｃｕ－Ｎｉ（Ｐｔ）矿床，主要形成于以前寒武系为基底的大陆裂谷，部分形成于增生褶皱带中显生宙地层为基底的裂陷槽环境。根据形成时代、当时所在的构造环境单元及成矿岩浆系列，划分为９个矿床成矿系列和８个矿床成矿亚系列。成矿时代以元古代、晚古生代为主。现今，矿床主要分布于地台边缘，造山带中也有产出，但不代表其当时形成的地质背景。成矿物质来源为上地幔，原始岩浆以上地幔部分熔融的高ＭｇＯ拉斑玄武岩（拉斑橄榄玄武岩）岩浆系列为特征，也有钙碱性岩浆（喀拉通克）和科马提岩岩浆系列（桂北）。地壳物质混染比较普遍。矿床成因类型主要为岩浆熔离型，且以硅酸盐岩浆上侵前的深部熔离作用为主。还有热液成因类型（煎茶岭）。矿床成矿系列的时空分布与中国大陆的构造演化密切相关  相似文献   

Trajectory Analysis and Design for A Jupiter Exploration Mission   总被引：1，自引：0，他引：1  

Chen Yang  Baoyin He-xiLi Jun-feng 《Chinese Astronomy and Astrophysics》2013

The trajectory design for a Jupiter exploration mission is investigated in this paper. The differences between the Jupiter exploration trajectory and the Mars or Venus exploration trajectory are mainly concerned about. Firstly, the selection of the Jupiter-centered orbit is analyzed based on the Galileo Jupiter mission. As for the Earth-Jupiter transfer orbit, the fuel consumption of the direct transfer is too large. So the energy-saving technologies such as the planetary gravity assist should be used for the trajectory to the Jupiter. The different sequences of planetary gravity assists are examined by applying the Particle Swarm Optimization (PSO). According to the searched result, the Venus-Earth-Earth sequence (VEEGA) is the most effective one for the Jupiter mission. During the Jupiter mission, the spacecraft will pass though the main asteroid belt between the orbits of Mars and Jupiter, and may encounter multiple asteroids. Therefore the Jupiter mission is able to combine with the main-belt asteroid flyby mission. The design method of the intermediate asteroid flyby trajectory is also considered. At last, an entire trajectory for the Jupiter mission launched in 2023 is presented.  相似文献   

The Bootstrap Estimation of the Accuracy of Preliminary Orbit Determination     

Wang Xin 《Chinese Astronomy and Astrophysics》2013

From the point of view of the non-parametric statistics, a general estimation method of the accuracy and con?dence interval of preliminary orbit determination is proposed for the occasion without any other information but observational data. Based on the bootstrap method, the estimation relies only on the observational data and does not require the precise orbit determination as a reference, or the assumption of normal distribution of observational errors. Numerical experiments show that this method is very simple in implementa- tion, and may serve as an easy accuracy evaluation for the preliminary orbit determination and for the follow-up employments.  相似文献   

Mohr Space in Andersonian Stress State and Its Application in Active Fault     

TONG Hengmao 《《地质学报》英文版》2013,87(Z1):387-387

  相似文献