识别所钻地层的人工神经网络法应用

对用人工神经网络方法来解决钻探生产的实际问题, 在不取心的情况下识别所钻地层的岩性进行了研究.根据钻探生产的特点, 设计了人工神经网络的结构和输出方式, 开发了人工神经网络识别所钻地层的软件, 分析了影响人工神经网络应用效果的各因素, 在人工神经网络的优化设计方面作了较深入的研究.研究表明: 人工神经网络用于识别所钻地层有很好的效果; 人工神经网络的参数, 如学习率、隐含层层数、隐含层单元数和数据处理方式等对人工神经网络的应用效果有影响.      

含盐地层工程性能及其对铁路工程施工的影响

含盐地层作为一类特殊的工程地质体,其工程性能具有易变性,各向异性以及冻胀性等特点,由于含盐地层中含有易溶盐,土体的物理力学性质因环境因素如气修、地下水和受力性质的改变而发生明显的变化,而且对修建于其构筑物具有腐蚀性,本文以穿越罕尔汗盐湖的青藏铁路路基基底地层和盐渍地为研究对象,对盐湖岩盐和周边地区盐渍土层清土层的工程地质性质进行研究,通过对含盐地层基本工程性能的系统研究,归纳出在通过含盐地层时,铁路对含盐地层基本工程性能的系统研究,归纳出在通过含盐地层时,铁路工程施工应该注意的事项,以保证工程项目的长期稳定性。     

三维地层模型中地层划分的探讨

地层作为三维地层模型的一个重要概念,在三维地层模型的建立中起着关键作用。如何以岩性来刻划这些层面就显得非常重要了。根据地质钻孔资料中岩层分界点的排列,确定地层的排序。根据多层DEM建模的概念,按岩性对多层DEM进行了交叉划分处理。形成空间中严格按照岩性为要素进行划分的三维地层模型的骨架结构。     

海洋生物技术前沿领域研究进展

根据近期国际海洋生物技术研究发展的有关信息资料,介绍了海洋生物技术研究的现状、前沿领域和最新研究进展,并展望了今后的发展趋势及我国应采取的措施。     

海洋微生物多样性研究进展

海洋微生物多样性是生物多样性的重要组成部分。由于基础研究薄弱,目前对海洋微生物多样性的了解远远落后于陆地微生物,尤其是其研究方法亟待完善和提高。近年来,随着分子生物学技术的迅速发展和计算机的广泛应用,海洋微生物多样性的研究取得了一系列的研究成果。概述了海洋微生物多样性的概念和研究方法及其资源开发利用的研究进展。     

MARINE SOURCE ROCKS AND THEIR DEPOSITIONAL CONDITIONS OF MESOZOIC—CENOZOIC IN THE GAMBA—TINGRE BASIN,SOUTH TIBET:ORGANIC GEOCHEMICAL STUDY

MARINE SOURCE ROCKS AND THEIR DEPOSITIONAL CONDITIONS OF MESOZOIC—CENOZOIC IN THE GAMBA—TINGRE BASIN,SOUTH TIBET:ORGANIC GEOCHEMICAL STUDY1　FuJiamo ,ShengGuoying ,XuJiayou,et.al.ApplicationofbiologicalmarkersintheassessmentofpaleoenvironmentsofChinesenon marinesediments[J] .OrganicGeochemistry ,1990 ,16 :76 9～ 779. 2　JenkynsHC .Cretaceousanoxicevents:fromcontinentstooceans[J] .JournaloftheGeologicalSociety ,1980 ,137:171～188. …     

Water Quality in the Great Barrier Reef World Heritage Area: Past Perspectives, Current Issues and New Research Directions

Elevated sediment and nutrient concentrations have long been regarded as the pre-eminent water quality threats to the Great Barrier Reef, with the potential risk posed by other pollutants such as heavy metals, persistent chlorohydrocarbons, PCBs and petroleum related compounds considered to be of lesser consequence. However, the management focus on these latter types of pollutants has recently shifted to acknowledge the potential impact posed by diuron, dioxins, dieldrin, and mercury and cadmium concentrations detected in sediments and biota along the Great Barrier Reef and southern Queensland coastline. In general, these threats originate from areas dominated by intensive cropping agriculture and are exacerbated by high rainfall and erosion rates in the wet tropics region of the Queensland coast. Maintenance of long-term monitoring programmes, which utilize innovative data acquisition techniques will enable assessment of change in environmentally relevant pollutant concentrations over time. However, improved land management practices, which include an immediate minimization of vegetation clearance and responsible use of pesticides and fertilizers in Queensland are essential if water quality in the Great Barrier Reef World Heritage Area is to be maintained and protected.     

Application of radiolarians and other fossils in non-Smith strata--Exemplified by the A'nyêmaqên melange belt in East Kunlun Mts

The main character of melange strata in an orogenic belt is the integration of mixed materials due to the superposition, displacement or loss of various tectonic slices (blocks) of different origins and environments, different scales, different grades of deformation and metamorphism, and different stages of tectonic evolution. The approach to non-Smith strata in an orogenic belt is to focus on the understanding of the age, facies, tectonic setting of the original formation and the process of deformation-metamorphism of each tectonic slice, reconstruct the history of dispersal and integration of these tectonic slices in time and space, i.e. 4-dimensional. This paper studies the age and facies of the original formation of tectonic slices in the A'nyêmaqên melange belt based on new data of radiolarians, sporo-pollen and trace fossils, and cast new lights on the research of the evolution process of that belt.     

柴达木盆地石炭系地层特征与分布

首先对柴达木盆地露头区的石炭系地层特征进行了研究,根据古群的对比,确定了岩石地层的时代;然后根据柴达木盆地新完成的参数井－－霍参１井的资料进行地质、地震统层;在解释了现有的地震剖面的基础上作出了盆地东部地下石炭系的分布范围图,这一成果对指导柴达木盆地石炭系的油气勘探具有重要的意义。     

福建南部沿海的江豚

在闽南厦门至漳浦沿海获22只江豚,根据背部棘状小结节的数量与分布,可明显分为两个亚种,即指名亚种(N.P.Phocaenoides,81%)和北方亚种(N.P.Sunameri,19%),表明本海域是几个亚种的混栖地带,分析了这些江豚的外部形态和种群结构,测定了脂肪层及各内脏的重量.