金属矿床氧化带中铁矿物的演化及其与金次生富集的关系

作为地壳中常见的主要变价元素—铁 ,它与金在内生成矿及表生再富集过程中的关系十分密切。铁在矿床中的分布及铁的硫化物矿物在氧化过程中演化的阶段性与环境的Eh值,pH值有着密切关系;进而影响和控制了金在表生演化过程中的地球化学行为。     

使用量化器件获得高精度测量方法的几点讨论

本文从列阵器件测量精度的估计公式出发，推导了用低精度Ａ／Ｄ变换器件获得高精度测量结果的一般性证明，还讨论了这种方法的若干可能应用。     

A Simple Shear Model for the Asymmetry in the Paleoproterozoic Fold Belt in Liaodong Peninsula

IntroductionThe Liaodong Paleoproterozioc fold belt is locat-ed at eastern China -- Korea craton, from Liaodongpeninsula through southern Jilin to north Kore$tothe east, to west Jiaodong peninsu1a to the west. Al-though many discussions, in the literature…     

扇贝氨基多糖的红外光谱分析

从海湾扇贝中提取出具有抗凝活性的氨基多糖，其中，氨基己糖含量为２２．６０％，己糖醛酸含量为２３．３０％，含硫量为６．６６％。样品经ＫＢｒ压片，于１０ＤＸ－ＦＴＩＲ红外光谱仪中进行光谱扫描，发现，该多糖具有典型的氨基多糖红外光谱，分子中含有－ＮＨ，－ＣＯＯ，－ＯＳＯ３＾－等氨基多糖特征基团。与氨基多糖标准品－肝素，６－硫酸软骨素和透明质酸的红外光谱进行比较分析，表明，扇贝氨基多糖与肝素的红外光谱相似     

因子分析法在密鲴生殖力研究中的应用

应用因子分析法研究密鲴繁殖力与诸因素的关系。六个变量是体长、体重、成熟系数、绝对怀卵量和相对怀卵量。29个样本、经正交变换得到3个因子:绝对繁殖因子、相对繁殖因子和成熟因子。     

Groundwater use by plants in a semi-arid coal-mining area at the Mu Us Desert frontier

The hydrogen isotope (deuterium- $ \delta D $ ) composition at natural abundance levels of xylem water, soil water, groundwater, river water, and rainwater was used to evaluate whether adult plant species use groundwater and to detect seasonal shifts (dry/wet season) in water sources for plants growing in a semi-arid coal-mining area (located at the frontier of the Mu Us Desert). A direct inference approach and the IsoSource mixing model were used to estimate the contributions of different sources to the plant xylem water. The results showed that (1) the $ \delta D $ values of rainfall fluctuated considerably, while those of groundwater were generally constant during the experimental period; (2) the $ \delta D $ patterns in plant xylem water suggest that groundwater was a significant source of water for transpiration in the dry season, while all five selected species reduced dependence on groundwater sources in the wet season; and (3) soil water from the deep layer (50–100 cm) was used largely by adult species possibly because of interspecific competition. These results indicated that coal mining would significantly affect plant growth by reducing the water supply if it leads to a water table decrease. Therefore, it is necessary to protect groundwater resources during the coal mining operations in the region.     

地磁日变观测仪器的对比分析

当前海洋磁力探测中为了消除或减小地磁日变化的影响,必须设立地磁日变观测站（简称日变站）测量磁场变化,提供日变校正资料。依据多年工作经验,对作为基站使用的G882磁力仪和Sentinel磁力仪在工作原理、仪器技术性能、工作使用体会等方面进行综合比较分析。结果表明,Sentinel磁力仪比G882磁力仪对环境适应性更好、灵活性更强,进行日变观测时应优先选用。     

科学工作流技术及在天文研究中的应用探讨

近几年来虚拟天文台技术的发展极为迅速,各国虚拟天文台研究相继启动,一系列虚拟天文台标准被提出并投入应用,有效地推动了信息技术在天文研究中的应用。科学工作流技术作为高性能计算与虚拟天文台中的关键技术,一直是研究的重点。但长期以来,受到业务工作流技术的影响,科学工作流的具体功能与作用,一直不被广大天文工作者理解和重视,限制了科学工作流的推广与应用。对科学工作流进行了深入分析,介绍了其基本功能和业务模型,详细比较了与业务工作流的差异。最后讨论了科学工作流在天文研究中的应用方法,对科学工作流的发展进行了展望。     

pRPL 2.0: Improving the Parallel Raster Processing Library

This article presents an improved p arallel R aster P rocessing L ibrary – pRPL version 2.0. Since the release of version 1.0, a series of modifications has been made in pRPL to improve its usability, flexibility, and performance. While retaining some of the key features of pRPL, the new version has gained several new features: (1) a new DataManager class has been added for integrated data management, and to facilitate data decomposition, assignment mapping, data distribution, Transition execution, and load‐balancing; (2) a GDAL‐based raster data I/O mechanism has been added to support various geospatial raster data formats, and provide centralized and pseudo parallel I/O modes; and (3) a static load‐balancing mode and a dynamic load‐balancing mode using the task‐farming technique are provided. A parallel zonal statistics tool and a parallel Cellular Automata model were developed to demonstrate the usability and performance of pRPL 2.0. The experiments using the California datasets showed that the performance altered when different pRPL options (i.e. load‐balancing mode, I/O mode and writer mode) were used for different algorithms, datasets, and varying numbers of processes.     

南海珠江口盆地深部烃类微渗漏的分子地球化学揭示

对南海珠江口盆地Site4B站位柱状沉积物可溶有机质中正构烷烃进行详细分析,结果显示海底以下65~70cm、80~85cm和85~90cm存在明显的似成熟烃类分布。在气相色谱质谱图上(GCMS),该处存在明显的UCM分布;在烃类分布上,该处以可溶有机质中高碳数正构烷烃奇偶优势趋于消失为特征,CPI为1.15~1.45。同时,整个剖面其他层段沉积有机质中可溶烃类仍以典型的近/现代沉积有机质输入为标志。结合区域地质背景,以及该区域天然气水合物的勘探发现事实,推断Site4B站位海底以下65~70cm、80~85cm和85~90cm烃类异常可能系深部烃类微渗漏所致。