青海大柴旦金龙沟金矿控矿构造分析

金龙沟金矿的控矿构造,是两个连续的层间倾伏褶皱构造;区内的金矿体主要产于两褶皱的公共翼及转折端处,形态和产状受相应的次级构造控制。继承性的构造活动导致了金矿化的多期次性。     

Experimental studies on pathway patterns of secondary oil migration

The oil migration patterns in porous medium are discussed based on the results of diphasic expulsing experiments. In the experiments, dyed kerosene was used as expulsing phase to expulse water saturated in a glass cylinder filled with sorted glass beads. Two series of experiments were done: one with different initial oil column heights and the other with variable oil injection rates. Three secondary migration patterns, including stable displacement pattern, fingering pattern and stringing pattern may be recognized in each series of experiments. Two classic dimensionless parameters, the modified Bond number and the Capillary number, were used to construct a phase diagram that may characterize the patterns. A new method was proposed to calculate the Darcian velocity of moving kerosene in the cylinder when only buoyancy force acts. It is found that when Darcian velocity is used to get the two dimensionless parameters, the data from both series of experiments, as well as those obtained from literatures, may be reasonably drawn in a phase diagram to identify the three migration patterns.     

DESIGN AND APPLICATION OF DYNAMIC MONITORING AND VISUALIZATION MANAGEMENT INFORMATION SYSTEM OF KARST LAND ROCKY DESERTIFICATION

In order to study the spatial-temporal change and environmental management of regional karst LUCC (land use and land cover change) and its causative environmental effect-rocky dcsertification by integrating qualitative analysis and quantitative analysis, and relying on RS, GIS and GPS (3S) techniques, karst land rocky derification dynamic monitoring and visualization management information system (KLRD.DMVM.IS) is framed, which includes design aim and structure model, function design, database design and model system design. The model system design gives priority to dynamic monitoring, drive force diagnosis, comprehensive evaluation and decision support of karst rocky desertification. From the viewpoint of model type, mathematic expression and its meaning, the dynamic monitoring models are concretely devised to reflect the spatial and temporal changing features and the trend of karst LUCC and rocky desertification. Taking Du‘an Yao Autonomic County of Guangxi as an example, the KLRD.DMVM.1S is systematically analyzed in the application of the process and trend of karst LUCC and rocky desertiflcation in Du‘an County, and it provides the technical support for the study on karst land rocky desertification.     

Observational and Mechanistic Analysis of a Nighttime Warm-Sector Heavy Rainfall Event Within the Subtropical High over the Southeastern Coast of China

In August 2021, a warm-sector heavy rainfall event under the control of the western Pacific subtropical high occurred over the southeastern coast of China. Induced by a linearly shaped mesoscale convective system(MCS), this heavy rainfall event was characterized by localized heavy rainfall, high cumulative rainfall, and extreme rainfall intensity.Using various observational data, this study first analyzed the precipitation features and radar reflectivity evolution. It then examined the role of e...     

运用GIS分析安徽省六安市地震次生地质灾害危险性

将层次分析方法运用到地震次生灾害评价中,结合GIS技术,运用多源数据,以潜在地震次生地质灾害为例,选取灾害发育的主要控制性影响因素,包括致灾因素、诱灾因素、历史因素,建立地震次生地质灾害评价指标体系,并建立五级评分值标准。在此基础上利用GIS方法对基础资料进行处理和分析,通过统计、叠加、合并、分类等空间分析方法,得到地震次生灾害危险性等级评价结果。结果表明:六安地区的地震次生地质灾害危险性总体呈现从南到北递减的阶梯型分布特征。其中,较高的地区主要集中在金寨、霍山和舒城县的侵蚀中低山和剥蚀丘陵地区,且以活动断裂分布中心向两侧递减。     

关中平原大地等效电导率的间接测量

为准确预报地波传播时延,用电波传播法对关中平原的大地等效电导率进行了间接测量。阐述了电波传播法的测量原理和方法,第一次给出关中平原大地等效电导率的间接测量结果,同时,给出了中国科学院国家授时中心临潼科研楼参考点的BPL信号传播时延测量结果,并对这些测量结果进行了精度分析。     

中国南海软珊瑚附生真菌Acremonium sp. SCSIO41216的次级代谢产物研究

采用硅胶柱层析色谱法、中压正相柱层析色谱法、中压反相柱层析色谱法以及半制备高效液相色谱法对中国南海软珊瑚来源真菌Acremonium sp. SCSIO41216的大米发酵产物进行分离纯化, 并使用核磁共振、质谱等波谱学方法, 结合其理化性质及文献数据鉴定了7个单体化合物结构: fischexanthone(1)、sydowinin A (2)、(22E)-5α,8α-epidioxyergosta-6,22-dien-3β-ol (3)、16-O-去乙酰基夫西地酸内酯(4)、环-(S)-脯氨酸-(R)-亮氨酸(5)、环-(S)-脯氨酸-8-羟基-(R)-异亮氨酸(6)和环(L)-脯氨酸-(L)-苯丙氨酸(7)。化合物1—7均首次从海洋软珊瑚来源的枝顶孢属真菌(Acremonium sp.)中分离获得。     

Do young martian ray craters have ages consistent with the crater count system?

McEwen et al. (McEwen, A.S., Preblich, B.S., Turtle, E.P., Artemieva, N.A., Golombek, M.P., Hurst, M., Kirk, R.L., Burr, D.M., Christensen, P. [2005]. Icarus 176, 351-381) developed a useful test for the internal consistency of crater-count chronometry systems. They argued that certain multi-kilometer, fresh-looking martian craters with prominent rays should be the youngest or near-youngest craters in their size range. The “McEwen et al. test” is that the ages determined from crater densities of the smallest superimposed craters (typically diameter D ∼ 5-20 m) should thus be comparable to the expected formation intervals of the host primary. McEwen et al. concluded from MOC data that crater chronometry failed this test by factors of 700-2000. We apply HiRISE and other imagery to eight different young craters in order to re-evaluate their arguments. We use existing crater chronology systems as well as the reported observed production rate of 16 m craters (Malin, M.C., Edgett, K., Posiolova, L., McColley, S., Noe Dobrea, E. [2006]. Science 314, 1573-1557; Hartmann, W.K., Quantin, C., Mangold, N. [2007]. Icarus 186, 11-23; Kreslavsky [2007]. Seventh International Conference on Mars, 3325). Every case passes the McEwen et al. test. We conclude that the huge inconsistencies suggested by McEwen et al. are spurious. Many of these craters show evidence of impact into ice-rich material, and appear to have ice-flow features and sublimation pits on their floors. As production rate data improve, decameter-scale craters will provide a valuable way of dating these young martian geological formations and the processes that modify them.     

基于MAPGIS二次开发的采矿权登记信息自动矢量化

以MAPGIS6.7为平台,结合VB6.0和ACEESS数据库进行二次开发,实现了采矿权登记信息数据库精确、快速的自动矢量化,为矿山遥感调查与监测项目提供了强有力的技术支持,有效提高了实际工作效率。     

Changing Perspectives in High School World Geography: 1950–2005

Abstract

This study set out to better understand the changing links between geography and citizenship. Content analysis was conducted on eighteen high school world geography textbooks and state/national standards. Interviews were conducted with teachers and textbook authors. Five significant changes were noted: decline of national orientation and a greater focus on non-Western cultures; greater emphasis upon consumption over production; the accentuation of values clarification; increasing coverage of basic or prevocational skills; and standardization of format and content in textbooks. Many of these changes point towards a new cosmopolitan citizenship model, although some teachers and state social studies standards still see geography from a national perspective.