小比例尺地图面状水系名称注记自动配置研究

在丰富面状水系的注记配置规则基础上,深入研究了其名称注记自动配置中两个关键算法,即要素主骨架线求取和注记配置方案的设计,并提出了基于单调链化简思想确定面状水系主骨架线的改进算法,在此基础上设计了面状水系名称注记自动配置方案。     

HHT方法在研究地震旋回体中的应用

HHT(Hilbert-Huang变换)是一种近年才发展起来的非线性信号处理方法,具有明确的物理意义、高度的精确性和自适应性,但在地震信号处理中尚未得到广泛的应用。简要介绍了HHT的方法原理,然后分析了模型信号和地震旋回体的HHT时频谱。结果表明:HHT对模型信号的识别能力强,且不同类型地震旋回体与其HHT时频谱之间存在对应关系,这为地震层序的划分以及进一步的沉积相分析提供理论依据。     

塔克拉玛干沙漠公路人工防护林植被的C, N化学计量特征及其固存能力研究

本研究以塔克拉玛干沙漠公路沿线生物防护林为研究对象,研究防护林三种主要建林植物不同器官的C,N含量及其生物量,进而估算其C, N固存能力及固碳释氧价值。结果显示：沙拐枣每个器官的生物量均显著高于梭梭和柽柳(P<0.05),个体的总生物量是梭梭和柽柳的2-3倍。整个防护林在建林8年后的总生物量达到116786.4 t。C,N含量在不同器官中的含量不尽相同,三种植物均表现为凋落物C含量最低。而植物叶中的N含量均显著高于枝,凋落物和根系(P<0.05)。建林8年后梭梭单株的固碳量为1404.6g,固氮量为201.5g,柽柳单株的固碳量为1449.7g,固氮量为195.4g,沙拐枣单株的固碳量和固氮量显著高于其他两种,分别为3979.8g,为520.9g,(P<0.05)。建林8年后整个防护林的总固碳植为35886.3 t,总固氮值为4917.7 t。整个防护林的固碳总价值为22555.3万元,释氧价值为50320万元,总的固碳释氧价值达72875.3万元。     

GStar I型自动土壤水分仪误差原因分析

为提高GStar I型自动土壤水分观测仪数据质量,利用2012—2013年渭南市8个气象站土壤水分观测固定段自动与人工观测数据进行对比分析,并从标定区间及方法、土壤冻结、仪器跳变、观测环境、人工取土等6个方面分析误差原因,得出提高数据质量的方法与建议。

     

Petrogenesis of Songshugou dunite body in the Qinling orogenic belt,Central China: Constraints from geochemistry and melt inclusions

The chemical variation of the Earth’s mantle rocks has been interpreted to reflect multiple episodes of partial melting. With the increasing of melt generation and extraction, the readily molten minerals and incompatible elements decrease in the residual mantle peridotite. The present-day gladiate of the Earth, however, cannot cause mantle batch melting[1], nor 40% partial melting that allows pyroxenes to be completely dissolved into melt and forms dunite[2,3]. Recent studies show that mantl…     

Impact of Mining Activities upon Environment in Panzhihua Region, Southwestern China

Mining activities have left huge uncovered slopes, large areas of gangue ground and extensive railings dams. In this paper, we studied some impacts of mining activities upon environment in Panzhihua region, southwestern China. The environmental impacts include ecological destruction, geological disasters, environmental pollution, land damage, solid waste and occupational health effect in study area. The author suggested that local government should take some measure to reduce environmental impact in Panzhihua City. First, the countermeasure of reducing environmental impact is to set up ecological rehabilitation and environmental management system, which ensure the sustainable development of resources, environment, economy and society in this region. Second, the area needs to be monitored regularly for trace metal and other pollutants to forewarn urban eco-environmental safety.     

Analysis on the ecological benefits of the stream water conveyance to the dried-up river of the lower reaches of Tarim River,China

Water is the foundation of the composition, de-velopment and stability of the oasis ecosystems in thearid areas, and is the key ecological factor in the aridareas. The study results showed that in the arid areasthe biological process is weak, the biological ecosys-tems are small in scale and low in stability[1— . So the 9]growth of the natural vegetation is directly influencedby the change of groundwater level, leading to thedegradation of ecosystem[10,11]. Analysis on the rela-tionship betwe…     

Gold mineralization age of the Anjiayingzi gold deposit in Chifeng County,Inner Mongolia and implications for Mesozoic metallogenic explosion in North China

The Anjiayingzi gold deposit in Chifeng County, Inner Mongolia is located in the central part of the gold mineralization belt of the northern margin of the North China Craton (NCC), and is adjacent to the Paleozoic Inner Mongolia-Da Hinggan Mountains orogenic belt in the north. The Chifeng-Kaiyuan fault, which separates the NCC from this orogenic belt, is considered to be a regional ore-controlling structure. The Anjiayingzi gold deposit is a mediate-size quartz lode-gold deposit and is hosted by the Anjiayingzi quartz monzonite that was emplaced into the basement composed of early Precambrian gneisses. Rhyolitic and porphyritic dikes are generally associated with the gold mineralization. Zircon U-Pb analyses suggest that the Anjiayingzi granite was emplaced from 132 Ma to 138 Ma, while the rhyolitic dikes that occupy the same fracture system as the gold-bearing quartz veins and locally crosscut the gold lodes crystallized from 125 Ma to 127 Ma. These results constrain the mineralization age between 126     

Prediction of Extreme Significant Wave Height from Daily Maxima

For prediction of the extreme significant wave height in the ocean areas where long term wave data are not available, the empirical method of extrapolating short term data (1-3 years) is used in design practice. In this paper two methods are proposed to predict extreme significant wave height based on short-term daily maxima. According to the da-a recorded by the Oceanographic Station of Liaodong Bay at the Bohai Sea, it is supposed that daily maximum wave heights are statistically independent. The data show that daily maximum wave heights obey log-normal distribution, and that the numbers of daily maxima vary from year to year, obeying binomial distribution. Based on these statistical characteristics, the binomial-log-normal compound extremum distribution is derived for prediction of extreme significant wave heights (50-100 years). For examination of its accuracy and validity, the prediction of extreme wave heights is based on 12 years' data at this station, and based on each 3 years' data respectively