关于求解碾磨机运动问题的相关讨论

针对关于求解碾磨机上一点运动的速度及加速度的问题展开讨论,从运动的不同角度考虑,给出了n种不同的解法。并将此问题拓展到一般情况下进行讨论,得出正确结论。并就一些相关问题进行了分析和解释。     

内蒙古大青山地区构造新样式初探

内蒙古大青山地区侏罗纪盆地中发育有断层相关褶皱，有十分清晰的断层传播褶皱，断层转折褶皱等构造样式。断层相关褶皱轴向呈东西向展布，形成褶皱的地层是早侏罗世右拐群煤系地层，表明该褶皱至少在煤层形成后，受南北向挤压应力作用形成。研究这一构造样式，对这一地区的推覆构造、盆山耦合研究具有重要地质意义。     

Environmental geochemistry of Zarshuran Au-As deposit, NW Iran

Zarshuran deposit is the most famous and important As-Au mine in Iran. However, there is no information on the impact of mining activity on the surrounding environment, especially on water systems. This paper attempts to document the concentration of arsenic and associated elements in waters and sediments resulting from the mining history of Zarshuran, a period covering hundreds of years. Water and sediment samples collected from Zarshuran Stream indicate high content of some potentially toxic elements, especially of As which ranges from 0.028 to 40 ng/l in water and 182 to 36,000 mg/kg in sediment samples. Mining activity, exposure of a large volume of mining wastes to weathering, and the anomalously high background of trace metals in the mining area are considered to be the main sources of heavy metal pollution.     

东北地区矿业开发态势与矿山环境地质问题综合研究

在论述东北地区矿业开发态势的同时,阐述了区内能源矿产、金属矿产及非金属矿产开采引发的主要环境地质问题,针对区内复杂的矿山环境地质问题现状,提出了开展东北地区矿山环境地质综合研究问题的工作思路.     

北斗三频伪距相关随机模型单站建模方法

为了提供可靠的伪距随机模型,基于3个线性无关的北斗三频伪距/载波无几何无电离层(GIF)组合,研究了一种利用单站数据估计北斗三频伪距相关随机模型算法。该算法首先利用低阶多项式对GIF组合进行拟合,以尽可能消除非伪距噪声以外的其他常数和误差,然后利用多元线性回归分析实现对3个线性无关的GIF组合随机噪声同时建模,最后再由线性组合关系变换得到原始北斗三频伪距相关随机模型。经北斗三频实测数据验证结果表明,该算法可实现北斗非差三频伪距相关随机模型的单站解算,有利于为导航定位以及完好性监测提供精准随机模型。     

Modelling the Shimokita deep coalbed biosphere over deep geological time: Starvation,stimulation, material balance and population models

Basin models can simulate geological, geochemical and geophysical processes and potentially also the deep biosphere, starting from a burial curve, assuming a thermal history and utilizing other experimentally obtained data. Here, we apply basin modelling techniques to model cell abundances within the deep coalbed biosphere off Shimokita Peninsula, Japan, drilled during Integrated Ocean Drilling Program Expedition 337. Two approaches were used to simulate the deep coalbed biosphere: (a) In the first approach, the deep biosphere was modelled using a material balance approach that treats the deep biosphere as a carbon reservoir, in which fluxes are governed by temperature-controlled metabolic processes that retain carbon via cell-growth and cell-repair and pass it back via cell-damaging reactions. (b) In the second approach, the deep biosphere was modelled as a microbial community with a temperature-controlled growth ratio and carrying capacity (a limit on the size of the deep biosphere) modulated by diagenetic-processes. In all cases, the biosphere in the coalbeds and adjacent habitat are best modelled as a carbon-limited community undergoing starvation because labile sedimentary organic matter is no longer present and petroleum generation is yet to occur. This state of starvation was represented by the conversion of organic carbon to authigenic carbonate and the formation of kerogen. The potential for the biosphere to be stimulated by the generation of carbon-dioxide from the coal during its transition from brown to sub-bituminous coal was evaluated and a net thickness of 20 m of lignite was found sufficient to support an order of magnitude greater number of cells within a low-total organic carbon (TOC) horizon. By comparison, the stimulation of microbial populations in a coalbed or high-TOC horizon would be harder to detect because the increase in population size would be proportionally very small.     

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南岭南部铀矿与地下水的放射性关系

在铀矿的区凋、普查工作中,发挥水化学找矿的优势,提高找矿效果的关键是如何正确地解释、评价所找到的水异常。为此就必须弄清工作区内铀矿与地下水放射性之间的关系。本文根据南岭南部地区多年的水化找矿资料,从水文地球化学角度阐明了地下水放射性在空间上的变化规律和放射性水的分市特征。从已知铀矿床水异常特征分析中提出了矿致水异常的五项标志,这对我国南方潮湿大陆地区水异常的解释与评价有着普遍的实用意义。     

区域航空γ能谱场地球化学解释及预测方法的探讨

本文以“铀矿区域评价准则”为依据,试用因子分析主成分比值法,铀对钍(钾)的区域相对场法和铀成矿有利指数法,对我国YW-10和YW-10B两个测区的区域航空γ能谱场进行了地球化学解释及预测方法的研究,与已知矿区660测区从宏观上做了对比分析,并研究了γ能谱参数在走向长270km,宽50—70km空间上的分布变化规律。研究结果表明,这些方法对了解成岩时原始铀的分布及后期铀的地球化学活动规律,估计成岩、成矿阶段铀源岩可能提供的生铀量,识别铀成矿有利地区是有用的。     

Ground-based optical measurements of daytime auroral emissions: A new means of investigating space-weather related processes

The first optical signatures of plasmapause associated processes were gleaned from the daytime auroral emissions monitored from Maitri, the Indian station in Antarctica, using the newly built, ground-based, Multiwavelength Daytime Photometer (MWDPM). The plasmapause boundary inferred from these measurements conforms well with the known empirical relationship with the geomagnetic indexKp. The measurements made at 391.4, 486.1, 557.7 and 630.0 nm emissions revealed significant day-to-day variations in their spatial and temporal extents. These preliminary results are presented and discussed.