Sedimentary environment of Late Carboniferous Tangjiatun Formation in Acheng of Heilongjiang

According to the lithological assemblages and elemental geochemistry of the measured Profile,the authors studied the sedimentary and tectonic environment of the Late Carboniferous Tangjiatun Formation ...     

杭州湾淡化对虾养殖池水中氮磷营养盐的存在特征

利用2002年5～7月对杭州湾淡化对虾养殖虾池水环境中氮磷营养盐的调查资料,分析了该养殖水环境中氮磷营养盐的存在形态与行为,结果表明:(1)在该养殖水环境中,IP含量随时间变化不大,相对较稳定;(2)IN含量的变化主要受生物活动控制,在养殖过程中变化较大,NO3-N为IN的主要存在形态,但在养殖后期,NO2-N含量有所增加;(3)该养殖水环境中氮磷营养盐含量均超过富营养化阈值,因而已无法判断浮游植物生长的限制因子;(4)叶绿素a与IN含量成显著负相关,而与IP含量的相关性不显著。     

导航卫星受地球外辐射带影响仿真分析

目前国际上不同国家已经进行了多个导航系统的开发,而构成这些系统的关键空间段实体导航卫星通常分布在中高轨道上,通过地球辐射带对该空间区域内卫星的辐射影响进行仿真分析,对于中轨道空间辐射,当卫星屏蔽厚度大于9mm,再增加屏蔽厚度的方法对辐射隔离不再敏感;对于高轨道空间辐射,当卫星屏蔽厚度大于7mm,再增加屏蔽厚度方法对隔离辐射已经不再敏感。可见,仅从辐射加固角度来说,在卫星设计时,以10年寿命为例,对于中轨道卫星屏蔽厚度区间取[8,9]mm为宜,对于高轨道卫星屏蔽厚度区间取[6,7]mm为宜。     

集安南部大青沟铜及多金属矿区成矿潜力及找矿方向

大青沟铜及多金属矿区地表矿化线索较多,矿化类型复杂。在充分研究已有资料的基础上,认为该区的成矿在初始矿源层(块状硫化物的矿化阶段)的背景上,叠加了与燕山期火山岩、次火山岩有关的多种矿化类型,成矿潜力较大。     

南疆塔里木河流域生态环境近期变化的成因解释

南疆塔里木河流域的生态环境已引起社会和科技界广泛注意。本文分析了该地区生态环境近期变化的6个主要特点，并用自然和人文社会学观点解释了变化的成因，提出气候变化是该极干旱区生态环境变化中最活跃的主要自然因素及其影响方式，但在人类主要活动地区盆地主体，人类活动对生态环境变化起着决定性的作用。     

东准噶尔玛因鄂博地区增生楔中基性混杂岩块地球化学特征及构造环境探讨

东准噶尔玛因鄂博地区发育一典型的小型增生楔, 增生楔中辉长岩岩块具有高铝(Al2O3:14.38%～16.33%), 高钛(TiO2:1.81%～2.46%), 贫钾(K2O:0.17%～0.63%)的地球化学特征。相对富集大离子亲石元素(Sr、K、Rb、Ba), 高场强元素(Nb、Ta、Zr、Hf)没有明显的异常, 源区具有类似于洋脊玄武岩的特征。基性岩块具有类似于E-MORB和OIB的稀土元素配分形式, 没有出现Nb、Ta、Ti的明显亏损, 说明其形成过程中可能没有受到或受到较弱的消减带影响, 综合上述认识, 认为夹于增生楔中的此类基性岩块体很可能来源于洋壳俯冲过程中增生的海山残片;根据玛因鄂博增生楔物质组成特征以及前人的相关年代学证据表明该增生楔形成于古生代弧后盆地环境, 在晚泥盆世之前形成俯冲增生杂岩体。     

地质环境对建筑物的影响

在建筑物附近，尤其在故河道边缘地带大幅度开采浅层地下水，将导致建筑物地基产生后期不均匀沉降，使建筑物变形破坏。应引起建筑施工、浅层地下水开采时严重注意。     

《地球科学与环境学报》2004—2010年载文信息及被引频次统计分析

运用文献计量学方法,对《地球科学与环境学报》（以下简称《学报》）2004—2010年载文的第一作者学历、职称和服务单位、论文资助项目来源、研究领域、出版时滞、被引频次、下载次数、影响因子等论文信息指标进行了统计分析。结果表明《学报》呈现以下特征：高学历作者比例稳步提升;副高职称和中级职称作者是《学报》作者的骨干力量;作者来源呈多元化发展,主办单位论文呈下降趋势;大多数论文有各类基金项目资助;基础地质及矿产地质是《学报》载文的主要内容;出版时滞需要进一步优化;被引频次计量指标反映《学报》呈现良好的发展态势。     

Stakeholder consultation during the planning phase of scientific programs

Stakeholder consultation is being adopted as standard practice in the planning and management of natural resource management programs. While the utility of stakeholder participation has been investigated for the evaluation and implementation phases of natural resource management programs, few studies have examined the utility of stakeholder consultation during the initial phases of developing such programs. This paper presents a case study from a project developing a marine and coastal monitoring program for the Pilbara and Kimberley region of northern Western Australia. Via a series of workshops held in the region, stakeholders were asked to prioritise future research needs using several voting procedures. During the analyses of the results from the different voting procedures, it became apparent that there were high levels of inconsistency, poor correlation, and contradiction, between participants’ responses. Despite the rigour of the selection process used to identify ‘suitable’ stakeholders for the workshops, these results show that stakeholders did not have the technical or broader contextual knowledge about marine ecosystems to effectively and objectively contribute to the research prioritisation and planning process. Based on the outcomes of this study, we argue that project designers need to be clear about why they are involving stakeholders in a project, particularly in light of the costs involved (financial, time, resources, costs to the stakeholder) in stakeholder consultation. Stakeholder involvement may be appropriate in later stages of developing natural resource management programs (implementation and management), however, stakeholder involvement is not appropriate in the initial phases of such programs, where scientific expertise is essential in formulating scientific concepts and frameworks.     

一种复杂地理环境越野通行路径寻优算法

设计了基于障碍距离的优化算法,解决突发事件应急联动中复杂地理环境下最短路径的寻优求解问题。在详细分析地理空间高程、坡度、障碍物等空间信息的基础上,通过计算搜索空间、搜索方向和网络弧段权值构建网络拓扑关系网,并利用遗传算法对最优路径进行寻优求解。