石英示踪物源研究进展

综述了石英的性质和它作为有效指示剂来示踪物源的理论基础,进而详细介绍了使用扫描电镜、质谱、电子自旋共振和阴极发光等仪器对石英矿物的表面微结构、氧同位素比值、形成年龄和阴极发光颜色等特征进行研究来追踪物源的方法以及这些方法的可行性。还根据近年来研究者应用石英矿物来示踪物源的研究进展提出了今后利用石英研究物源需要注意的4个问题。     

河南省农村经济发展的人文环境分析--对16个农村的调查

通过对河南省16个村的调查分析,指出：农村经济发展与劳动力结构、规模、文化素质等存在较强关联,与村域在年内耕地减少量呈现一定相关,尤其与基础设施建设用地面积有密切关系;河南省农产品的商品化程度对农村经济发展的贡献程度较低,而农户兼业化随着时间发展起到一定的带动作用;在农村发展的外部环境中。村域所在县（市）的影响程度大于较大范围的地（市）的影响程度,但地（市）影响程度正逐步加强;在不同的历史时期,影响农村经济发展的人文因子逐渐增多;农村经济发展水平与村域的历史基础也有一定关联。     

柴达木盆地东部微体化石丰度与天然气源岩

柴达木盆地东部三湖坳陷上新统第四系自生自储的天然气藏,已成为我国四大天然气产区之一。与柴达木盆地侏罗系、古近系一新近系原油伴生气与凝析气不一样,三湖坳陷生物成因气的气源岩母质主要是浅水湖泊动植物的有机质。在该区诸多门类的生物群落中,具有双壳易于保存为化石的微体动物介形类的丰度,与生物成因气源岩的分布密切相关,介形类化石丰度高低变化基本上反映了气源岩的好坏或有无。本文以三湖坳陷介形类化石丰度纵横向变化,提出了三湖坳陷进一步勘探天然气的方向：向坳陷北、东和南部比向西部红三旱四号方向较有利,因为该坳陷西部湖水含盐量太高,介形类等水生生物能生存者不多,生烃母质量少。     

Evolution of the Pearl River and its Implication for East Asian Continental Landscape Reversion

As the link connecting the South China Continent and the northern South China Sea(SCS),the Pearl River is the focus of sedimentology and petroleum geology research.Its evolutionary process and controlling factors are of great significance in revealing the East Asian continental landscape reorganization during the Late Cenozoic.Based on published data,’source-to-sink’provenance analyses allow systematic deliberation on the birth and evolutionary history of the Pearl River.Close to the Oligocene/Miocene boundary,an abrupt shift in the sedimentary composition indicates significant westward and northward expansion of the river’s watershed area,followed by the establishment of a near-modern fluvial network.This sedimentary change generally concurred with a series of regional geological events,including the onset of the Yangtze throughflow,large-scale development of the loess plateau,and formation of the northwestern arid zone and Asian Monsoon system.These major changes in the geology-climate-ecoenvironment system are in close response to the process of the Cenozoic Xizang(Tibetan)Plateau uplift.Consequently,the East Asian continental landscape and most of midCenozoic drainage systems underwent critical reversion into east-tilting,or east-flowing networks.     

Quantitative prediction of gold lodes in gold mineralization series based on large-scale mineralization information measurement

The ability to quantitatively predict Au lodes in Au mineralization series with data from large-scale mineralization information is greatly needed. This paper discusses how to (1) classify the oreforming information, (2) set up the mineralization information model, (3) divide the statistical units within the minimum area of the mineralization anomalies, (4) select the comprehensive ore-forming (controlling) information variables, and (5) carry out the quantitative prediction using some newly proposed statistical models. Finally, the quantitative prediction results for Au lodes in a Au deposit, the Aohan Banner in Mongolia, are provided. Among the three first-grade prediction targets, two were tested and have been found to have industrial significance.     

星系盘中的磁重平衡:星系贮留原初磁场的观测证据

邻近旋涡星系中观测到的磁场被理论学家解释为发电机作用的结果.而我们发现,在邻近的星系中,磁场的强度与中性氢的柱密度紧密相关.星系盘中的磁场处于磁重平衡状态.这一结果与发电机放大机制相悖,从而支持星系磁场是原初起源的假说.     

基于GIS的冯家山灌区地质环境评价研究

冯家山灌区是陕西省渭北黄土台塬大型灌区之一 ,在灌溉过程中 ,由于片面提高地表水利用率而忽视地表水、地下水联合开发加之灌溉技术落后等原因 ,在灌区诱发了一些生态环境负效应。在分析灌区环境地质问题的基础上 ,运用地理信息系统 (GIS)技术 ,将GIS与模糊综合评价模型集成 ,对灌区地质环境质量进行评价 ,并针对不同地质环境质量分区探讨了水资源合理开发利用模式     

SN 1996W:中国天文学家首次发现的河外超新星

1996年4月10日，使用北京天文台兴隆观测站60cm望远镜及其主焦上的TI215CCD照相机[1]，在NGC4027天区发现了一颗超新星．这是今年开始的超新星巡天计划的第一个结果．这颗超新星已被McDonald天文台的王力帆证实，并被分类为Ⅱ型超新星．国际天文学会中央电报局已将它列为SN1996W[2]．     

Comparison of a computer-simulated stratus-topped boundary layer with aircraft observations

To assess the realism of large-eddy simulation (LES) of the stratus-topped boundary layer and its predicted turbulent structure, we performed detailed data analyses on a LES (which has a 12.5 m grid size in all three directions), in a manner similar to those used by Nicholls (1989) on aircraft measurements. The first analysis retrieves the primary convective elements, i.e., the negatively buoyant downdrafts, which are driven mainly by cloud-top radiative cooling, through a conditional sampling technique. Comparison shows that the LES of this resolution reflects most of the observed downdraft features; most of the discrepancies that exist between the obervations and the LES can be explained by decoupling of the cloud layer from the underlying flow that exists in the former but not in the latter. The second analysis shows the vertical velocity spectrum and its agreement with the measurements. In the third analysis, showing the turbulent kinetic energy budgets, the discrepancy in the turbulent transport term (i.e., the divergence of the third-moment quantity , the turbulent-kinetic-energy flux) between the LES and measurements exists even with such a fine resolution LES. This discrepancy is related mainly to the different behavior in between the LES and observations, which may again be associated with decoupling.An advantage of LES over aircraft observations is that the former can provide three-dimensional flow structure at any instant. In this paper, we examined the instantaneous flow structure and observed closed cellular patterns near the cloud top in which updrafts occupy the broad centers and relatively strong downdrafts occur in the narrow edges. In the intersections of these cell boundaries, there exist weak downdrafts, consisting of relatively cold and dry air, that are the most likely origins of the strong downdrafts extending throughout the mixed layer.The National Center for Atmospheric Research is sponsored by the National Science Foundation.     

The intrinsic acidity constants and specific surface area of marine solid particles I. A new method

This paper proposes a new method for determining the intrinsic acidity constantsK _a1 ^int andK _aj ^int . The new method is a great improvement over the modified Langmuir plot method generally adopted in that determination of these constants is not dependent on the specific surface area of the marine solid particles. The new method was used to determineK _a1 ^int ,K _2a ^int and for the main inorganic components of marine solid particles, including illite, montmorillonite, kaolinite, goethite, γ-AlOOH. amorphous ferric oxide, δ-MnO₂, manganite, SiO₂ and calcium carbonate, and can facilitate the study on the effect of solution constituents, solution temperature, ionic strength, etc. on the value of .