西天山阿吾拉勒石炭纪火山岩年代学和地球化学研究

西天山阿吾拉勒裂谷带内广泛发育石炭纪火山岩, 主要由玄武岩、粗面玄武岩、玄武质粗安岩、玄武质安山岩、粗面岩和流纹岩组成。以中基性岩为主, 多为钙碱性系列。LA-ICP-MS锆石U-Pb测年结果显示, 区内流纹岩形成于(316.1±2.2) Ma, 为早石炭世晚期。微量和稀土元素特征表明, 本区的火山岩具有俯冲带大陆边缘岛弧火山岩的典型特征, 应形成于早石炭世晚期的准噶尔洋向伊犁板块俯冲的大陆边缘弧环境。可能是由受俯冲流(熔)体交代的地幔楔尖晶石二辉橄榄岩发生1%~5%的部分熔融, 并在上升过程中经历了不同程度的结晶分离和同化混染作用而形成的。     

Human’s digital footprints on the Qinghai-Tibet Plateau: Variations during festivals and impacts on nature reserves

Mobile internet and wireless communication technologies have produced unprecedented location-aware data. Such big geospatial data can be used as a proxy measure of the ‘digital footprints' left by us on the planet and provide a valuable opportunity to understand the dynamic and short-term human disturbance on the nature at fine scales. This study investigated the spatiotemporal variations of human's digital footprints on the Qinghai-Tibet Plateau using smartphone-users-generated Tencent's location request data. The results showed that human's digital footprints cover less than 5% of Qinghai and Tibet, exhibiting either a U-shaped or an N-shaped temporal change pattern during the major festivals. Spatial changes of the digital footprints manifested a transition process from dispersion to concentration in Xining and Lhasa. Human disturbance assessment of seven large nature reserves on the plateau showed that the Qinghai Lake is the most disturbed one as shown by 14.6% of its area is stained with human digital footprints and the areal average of footprint intensity is 1.59, and the disturbance was significantly escalated during the National Day holiday. By contrast, the Qangtang and Hoh Xil are the least affected nature reserves with the two indices less than 1% and 0.1, respectively.     

高密度电阻率法在隧道勘查中的探测效果

通过一条新建铁路隧道用分布式高密度电阻率法勘查的实例,介绍了该方法的工作原理、施工方法及解释过程和探测效果等,证实了分布式高密度电阻率法在隧道勘查中具有仪器施工便捷、数据采集量大、地质信息丰富、分辨率高、成果可信等优势.表明了高密度电阻率法是新建铁路勘查的一种全新有效的地球物理勘查手段.     

郯庐深大断裂两侧主要矿产成矿特征研究

郯城—庐江深大断裂构造演化控制着东西两侧主要矿产的产布规律。有其相同的矿种，相似的矿床类型，但在其矿床规模上有所差异，郯庐深大断裂东侧产出大型的招掖型金矿床，大型东海型水晶矿，还有辽南瓦房店金刚石矿和宽甸蓝宝石矿；西侧产有大型的蒙阴型金刚石矿，大型昌乐型蓝宝石矿，也有沂南金矿床和大别山区麻城霍山紫水晶矿的分布。深入研究郯庐断裂构造演化与成矿特征，有望扩大找矿的前景。     

以航放为主的多源地学信息数字图像综合技术在连山关地区铀成矿预测中的应用

本文利用以航放为主的多源地学信息数字图像综合技术在连山关地区进行了铀成矿预测的试验研究,不仅探讨了成矿预测的方法与步骤,而且取得丁明显的预测效果。实践表明,该项新技术在铀矿地质勘查中,具有更直接的找矿意义和更大的实用价值。     

Field Measurements of Compaction Seepage Characteristics in Longwall Mining Goaf

Natural Resources Research - The spatiotemporal evolution of goaf caving zone compaction characteristics has important influences on surface subsidence, spontaneous combustion and gas and water...     

DEM–FEM analysis of soil failure process via the separate edge coupling method

The concurrent multiscale method, which couples the discrete element method (DEM) for predicting the local micro‐scale evolution of the soil particle skeleton with the finite element method (FEM) for estimating the remaining macro‐scale continuum deformation, is a versatile tool for modeling the failure process of soil masses. This paper presents the separate edge coupling method, which is degenerated from the generalized bridging domain method and is good at eliminating spurious reflections that are induced by coupling models of different scales, to capture the granular behavior in the domain of interest and to coarsen the mesh to save computational cost in the remaining domain. Cundall non‐viscous damping was used as numerical damping to dissipate the kinetic energy for simulating static failure problems. The proposed coupled DEM–FEM scheme was adopted to model the wave propagation in a 1D steel bar, a soil slope because of the effect of a shallow foundation and a plane‐strain cone penetration test (CPT). The numerical results show that the separate edge coupling method is effective when it is adopted for a problem with Cundall non‐viscous damping; it qualitatively reproduces the failure process of the soil masses and is consistent with the full micro‐scale discrete element model. Stress discontinuity is found in the coupling domain. Copyright © 2017 John Wiley & Sons, Ltd.     

STUDY ON TISSUE CULTURE FOR GELIDIUM SEEDLING

As seedling culture is a crcial factor for successful cultivation of Gelidium, the authors researched tis-sue culture technology for producing seedlings. The merphogeny and experirmental ecology were observedand studied fully in 2-5 mm isoIated tissue fragments, appearaare of branching creepersand attaching structure and new erect seedlings production and development were studied. Fragments weresown on bamboo slice and vinyon rope. The seedlings were cultured 20-30 days indoor, then cultured inthe sea, where the density of erect seedlings was 3- 19 seedlings/cm~2, growth rate was 3.84%/day. The frondarising from seedlings directly was up to 10 cm per year. The ecological conditions for regenerated seedlingsare similar to the natural ones. The regenerated seedlings are sintable for raft culture in various sea areas.     

关于确认太阳射电精细结构的几个问题

本文主要讨论了太阳射电快速观测记录中可能存在的几种非太阳因素，分析或定量估计了它们的影响，这些因素主要来自天线跟踪效应、接收机增益起伏效应以及地球大气吸收、折射等，估计、分析这些效应对确认太阳射电爆发中的精细结构现象是有益的。     

A solar wind model with the power spectrum of Alfvénic fluctuations

A new solar wind model has been developed by including in the model the Alfvénic fluctuation power spectrum equation proposed by Tu et al. (1984). The basic assumptions of the model are as follows: (1) for heliocentric distances r > 10 R _⊙, the radial variation of the power spectrum of Alfvénic fluctuations is controlled by the spectrum equation (1), (2) for heliocentric distances r < 10 R _⊙, the radial variation of the fluctuation amplitude is determined by the Alfvén wave WKB solution, (3) no energy cascades from the low-frequency boundary of the Alfvénic fluctuation power spectrum into the fluctuation frequency range, and the energy which cascades from the high-energy boundary of the spectrum into the higher frequency range is transported to heat of the solar wind flow. Some solutions of this model which, on one hand, describe the major properties of the Alfvénic fluctuations and the high-speed flow observed by Helios in the space range between 0.3–1 AU and, on the other hand, are consistent with the observational constraints at the coronal base have been obtained under the following conditions: (1) the spectrum index of the fluctuations is near to -1 for almost the whole frequency range at 10 R _⊙, (2) the particle flux density at 1 AU is not greater than 3 × 10⁸ cm^?2 s^?1, (3) the solution is for spherically-symmetric flow geometry or the solution passes through the outermost of the three critical points of the rapidly diverging flow geometry with f _max = 7. Some solutions passing through the innermost critical point of the rapidly diverging flow geometry with f _max = 7 have been found, however, with too low pressure at the coronal base to compare with the observational constraints. Heat addition or other kind of momentum addition for r < 10 R _⊙ is required to modify this model to yield better agreement with observations. A cascade energy flux function which leads to Kolmogorov power law in the high-frequency range of Alfvénic fluctuations is presented in Appendix A. More detailed discussions about the characteristics, the boundary conditions and the solution of the spectrum equation (1) are given in Appendix B.