DGZ-150B型旋喷钻机提升系统稳定性分析及改进

钻机提升系统在开启和关闭时存在着严重的液压冲击现象,因而会造成钻机运行的不平稳。产生液压冲击主要是由换向阀开启和关闭时液压油和负载的动能瞬时转化为压力能而造成的。本文结合DGZ-150B型多管全方位旋喷钻机,主要介绍了通过改进提升液压系统回路和选择合理的提升速度来降低液压冲击的影响。通过利用AMESim 软件对改进前后的提升液压系统建模仿真,可以看出改进后的液压系统对液压冲击有明显的控制,系统稳定性大大提高。按照改进后的提升液压系统对钻机的提升系统进行改造,钻机在步进提升时基本感觉不到液压冲击,钻机的震动大大减轻,稳定性增强。     

渝东南深部地热温度解析

热储温度是划分地热系统成因类型和评价地热资源潜力的重要参数。文章在采集分析渝东南13个地热水样的基础上,利用无蒸汽损失石英和有蒸汽损失石英温标法、玉髓法a和玉髓法b,修正的SiO2温标法,K-Mg、Na-Li、Na-K、Na-K-Ca等阳离子温标法计算渝东南深部热储温度,并利用Na-K-Mg三角图解法和矿物饱和指数法检验所用方法的可靠性,结果表明:研究区利用SiO2(无蒸汽损失)温标法和修正后的SiO2温标法计算所得出的热储平均温度更适用,各地热水点热储温度范围在62.78~124.81℃,平均热储温度88.98℃。      

四川盆地北部早白垩世剑门关组泥质岩地球化学特征及其地质意义

早白垩世剑门关组是研究四川盆地北部沉积环境演化的良好地层,对该地层开展系统的地球化学研究,对探讨四川盆地北部早白垩世剑门关组物源区性质、构造背景、古风化作用及古环境具有重要意义。系统分析了剑门关组泥质岩主量、微量和稀土元素地球化学特征,发现早白垩世剑门关组泥质岩富CaO、MgO,贫Al_2O_3、Fe_2O_3、K_2O、Na_2O、TiO_2、P_2O_5、MnO,富Cr、Cs、V,贫Sr、Nb、U、Hf,稀土元素总量为(164.96～234.35)×10^-6,轻、重稀土元素比值为11.77～15.87,轻、重稀土元素分馏程度高,轻稀土元素相对富集,具弱的正Eu异常。综合分析认为:剑门关组为同一物源的近物源再旋回沉积岩;源岩为沉积岩,可能富含斜长石、重晶石等富Eu矿物;源岩在沉积前经历了中等程度的化学风化作用,并发生了钾交代作用;剑门关组沉积期为温暖、湿润的气候,物源区具有由活动大陆边缘向大陆岛弧转化的特征。     

川西北马脑壳金矿床流体相分离作用及其成矿意义

马脑壳金矿床是近年来在川西北地区发现的一大型微细浸染型矿床。本文通过对流体包裹体系统研究，指出了石英-(白钨矿)-辉锑矿脉型金矿化阶段成矿流体曾发生过较强的相分离作用，并运用热力学原理探讨了流体相分离机制下金的沉淀成矿机理，提出了微细浸染型金矿床形成过程中流体相分离作用与成矿的关系。     

Spatial distribution of sandy desertification change in the west of Jilin Province

The sandy land of the western part of Jilin Province is located in the ecotone of semi-humid and semi-arid area in the temperate zone of China. The sandy desertification has widely spread in the region because of the vulnerable natural conditions and the unreasonable human activity; as a result of this, the precious land resources and the economic development in the area have been seriously impacted. In this paper, the sandy land ecologic environment geographic information system is established based on the multi-spectral, multi-temporal Landsat TM images and field investigation. The comprehensive indexes of sandy desertification extent assessment which include vegetation degradation, wind erosion extent and soil depth are presented to classify the sandy land in western Jilin into three levels--slight, moderate and severe sandy desertification with the support of GIS platform. The results demonstrate that the sandy desertification has been partly controlled in the past twenty years, except some small sites. However, this doesn't necessarily mean that there is nothing for more concern. The two main causes of sandy desertification have not been eliminated yet, one is its natural factor, especially the physical and chemical characters of sandy soil and dry climate; another is the immoderate economic activity of human being that has highly accelerated the sandy desertification process.     

古交镇矾石沟崩塌分析

地质灾害的形成严重制约了地方经济的发展，灾害形成机理研究可为其治理提供可靠的科学依据，阐述矾石沟崩塌灾害特点，探讨其形成机理及防治措施。     

Preface to Special Topic on Atmospheric Greenhouse Gas Measurement and Application in China

正China initiated a national carbon trading market in December 2017.Commitments and actions to reduce greenhouse gas (GHG) emissions require consistent,reliable and timely information on GHG emissions.GHG monitoring and modeling studies provide GHG emission estimates to evaluate and guide progress towards emission reductions.GHG monitoring has mainly focused on global-scale background networks over the last few decades,while recent efforts have been made on regional and urban scales,such as projects in the Beijing-Tianjin-Hebei city cluster,in Paris,Washington-Baltimore,Indi-     

GPS短基线解算中两种后处理软件的比较

为了获得高精度的GPS检定场成位结果，为以后GPS仪器的检定提供高精度的已知点，应用两种成熟的GPS后处理软件对检定场观测数据进行解算，并对两种软件得出的结果进行了比对。获得的结论对相关研究及应用用户也有一定的借鉴作用。