Space–time multiresolution atomistic visualization of MgO and MgSiO3 liquid data

First-principles molecular dynamics simulations of complex material systems such as geophysically relevant oxide and silicate liquids produce massive amounts of time-varying three-dimensional data for the atomic configurations. Given the high accuracy of these data, it is desirable to extract as much information hidden in the data as possible. In this paper, we elaborate on our recently proposed scheme to support interactive visualization at space–time multiresolution of the atomistic simulation data. Instead of just focusing on direct rendering of the given data, additional data (containing more quantitative and qualitative information) that usually have to be extracted by some other means are extracted and rendered on the fly. This allows us to gain better insight into the global as well as local spatio-temporal behavior of the data in the context of bonding, radial distribution, atomic coordination, clustering, structural stability and distortion, and diffusion. We illustrate such visualization for the simulation data on the liquid phases of MgO and MgSiO₃—the two most abundant components of Earth’s mantle. Our analysis shows that the structure and dynamics of both liquids change substantially with compression, with no discernible effects of temperature in most cases.     

废弃砖瓦窑厂土地复垦及其生态学原理

废弃砖瓦窑厂土地复垦技术包括工程复垦和生物复垦,在具体实施复垦方案时,要遵循生态学原理。工程复垦阶段,除了使被破坏土地恢复到可供利用的物理状态,还要考虑改善生态环境和生物多样性;生物复垦阶段,要按照生物与环境协同进化原理、生态结构稳定性与功能协调性等原理,采用施肥法、绿肥法、微生物法、管理法恢复土壤肥力与生物生产能力。淮安市淮安区范集镇大花村在废弃砖瓦窑厂土地复垦项目中,依据生态学理论,因地制宜,采取适宜的方案进行土地复垦,实现了生态环境的良性循环及土地资源的可持续利用。     

多源空间数据融合技术探讨

地理信息系统的迅速发展和广泛应用导致了空间多源数据的产生,给数据的集成和信息共享带来不便。不同数据源,不同数据精度和不同数据模型的地理数据融合理论与方法的研究,对于降低地理数据的生产成本,加快现有地理信息更新速度,提高地理数据质量有着重要的现实意义。本文对多种空间数据融合的原理与方法进行了讨论,给出了空间数据融合的多种应用,并对数据融合的发展方向进行了展望。     

http://www.sciencedirect.com/science/article/pii/S1674987112001065

It has been thought that granitic crust,having been formed on the surface,must have survived through the Earth’s evolution because of its buoyancy.At subduction zones continental crust is predominantly created by arc magmatism and is returned to the mantle via sediment subduction,subduction erosion, and continental subduction.Granitic rocks,the major constituent of the continental crust,are lighter than the mantle at depths shallower than 270 km,but we show here,based on first principles calculations, that beneath 270 km they have negative buoyancy compared to the surrounding material in the upper mantle and transition zone,and thus can be subducted in the depth range of 270-660 km.This suggests that there can be two reservoirs of granitic material in the Earth,one on the surface and the other at the base of the mantle transition zone(MTZ).The accumulated volume of subducted granitic material at the base of the MTZ might amount to about six times the present volume of the continental crust.Our calculations also show that the seismic velocities of granitic material in the depth range from 270 to 660 km are faster than those of the surrounding mantle.This could explain the anomalous seismic-wave velocities observed around 660 km depth.The observed seismic scatterers and reported splitting of the 660 km discontinuity could be due to jadeite dissociation,chemical discontinuities between granitic material and the surrounding mantle,or a combination thereof.     

机载粒子测量系统及资料处理

该文介绍了ＰＭＳ机载粒子测量系统及仪器的探测原理，描述了自行开发的数据处理软件的运行环境，流程图和特点，举例给出了部分处理结果形式。     

InSAR基本原理

作为InSAR系列讲座的第三篇，本文首先介绍干涉相位信号及InSAR测高与探测形变的基本原理。最后比较并讨论其在地表高程和形变测量中的敏感程度。     

物探资料综合研究需要强调的几个问题

对物探资料综合研究的一般原则进行了论述。结合工作实践阐述了高精度磁测追索覆盖层下的含矿破碎带的有效性,列举了用重磁法圈定与成矿控矿有关的岩体和间接找矿的成功案例。强调直接找矿与间接找矿并举、重视对物探低缓异常和"剩余异常"的解释研究等观点,提出要重视钻探等验证后的再解释和井中物化探工作以及新技术、新方法在矿产检查中的应用与研究,最大程度地提高并扩大对成矿信息的获取能力,从而提高物化探的勘查能力和找矿效果。     

河南省太行山东麓深部晚古生代层序地层及其含气系统划分

为了开展河南省太行山东麓深部晚生代的厚层暗色泥岩和煤层方面的系统研究。本文以晚古生代地层为研究对象,运用沉积学和层序地层学的方法,对研究区的上古生界太原组、山西组和下石盒子组进行精细地层对比及沉积相划分。研究结果显示：共识别出5种岩石类型和16种岩相类型,5种沉积相、10种沉积亚相类型,并识别出3种层序界面,2种关键性体系域界面,划分了10个三级层序及对应的体系域;由此建立该地区煤系地层层序地层格架,恢复等时地层格架内的岩相古地理特征,分析其沉积演化史,并建立了两种典型的沉积模式。在此基础上,结合气测录井资料,在层序地层格架内对隔水阻气层位和含气系统进行了识别和划分,揭示了煤层含气量的垂向分布特征和层序结构对含气系统的封闭性特征,完成了晚古生代煤系地层的含气系统划分,其中I类含气系统2个,位于太原组层序2和山西组层序4中。