利用原有似大地水准面成果多项式拟合GPS/水准高程的精度估计

多项式拟合在GPS高程拟合中最常采用,但是直接拟合高程异常的方法在高程异常变化不平缓的地区精度较差。本文试图在利用已有局部似大地水准面资料的基础上拟合高程异常残差,进而确定局部内小地区的正常高。本文首先阐述了四次多项式拟合的基本原理以及精度评定方法,然后具体算例,实际计算分析了此种拟合方法的精度。同时接合得出的结果,对小地区似大地水准面的二次精化提出了有益的建议。     

全球卫星导航定位连续运行参考站网的技术探讨——以JSCORS徐州试点工程为例

结合江苏省连续运行参考站网（以下简称JSCORS）徐州地区试点工程项目。对JSCORS系统做了简单的概括，总结该系统的创新点;从参考站网系统、系统控制中心系统、数据通信系统、用户数据中心系统、用户应用系统五个部分对JSCORS徐州子系统的系统组成做了的介绍;最后阐述了JSCORS徐州子系统的测试方法，并得出测试结果。     

Ore fluid of the Tieluping silver deposit of Henan Province and its illustration of the tectonic model for collisional petrogenesis,metallogenesis and fluidization

The Tieluping silver deposit, located in the NE-trending faults within the metamorphic basement of the Xiong'er Mountain, is a typical altered fracture type deposit. Its ore-forming process includes three stages with temperatures concentrated at 373°C, 223°C and 165°C respectively. With δD=90‰,\(\delta ^{13} C_{CO_2 } \)=2.0‰ and δ{si18}O=8094‰, the early stage fluid was generated from reworking and metamorphism of the carbonate rich formation; the late one, with δD=?70‰,\(\delta ^{13} C_{CO_2 } \)=-1.2‰, δ¹⁸O=1.89‰, was meteoric hydrothermal solution; and the middle. δD=?109‰,\(\delta ^{13} C_{CO_2 } \)=0.1‰, δ¹⁸O=1.79‰, might be a hybrid mixed by reworking-metamorphic fluid and meteoric hydrothermal solution. Crystallized rapidly in the condition of fluid-boiling and fluid-mixing, the middle stage minerals have far more fluid inclusions with higher content of ions, higher ratios of H₂O/CO₂ and KN/MC. Consequently, they have much more ore elements such as gold compared with those of the early and late stages. It was the northward intracontinental subduction along the Machaoying fault during the Mesozoic collision between the South China and North China paleocontinents that intrigued large-scale fluidization and magmatism and led to the appearance of more than 10 large and medium hydrothermal deposits, including the Tieluping silver deposit. The study on ore-forming fluidization of the Tieluping silver deposit proves the CPMF model.     

黔东及毗邻区南华纪“大塘坡式”锰矿研究历史、主要进展及展望

锰矿是国家战略紧缺矿产。自上世纪1958年在黔东松桃大塘坡地区发现"大塘坡式"锰矿以来,经过三代地质科技工作者的不懈努力,终于在锰矿成矿理论、找矿方法和找矿成果等方面取得重大突破,使黔东地区成为新的世界级锰矿资源富集区和中国锰矿资源最丰富的地区。为纪念"大塘坡式"锰矿发现60周年,特撰文介绍该地区锰矿的主要研究历史、研究现状和近年来该类型锰矿主要研究进展与找矿突破性成果,同时展望未来,提出下步工作建议。谨以此文向为黔东及毗邻区南华纪"大塘坡式"锰矿找矿事业做出突出贡献的老一辈地质工作者表示崇高的敬意!     

黔东地区含锰页岩选矿中试研究

黔东地区锰矿资源储量大,除主要为15%20%的中低品位资源外,还有相当部分未参与资源量估算的、锰含量在8%10%的含锰页岩,为使这部分低于边界品位的“锰矿石”得到合理开发利用,减少浪费。在实验室小型试验取得良好指标的条件下进行了选矿中试研究,研究发现,获得合格锰精矿的关键因素是选择高冲次强磁选条件,在原矿含Mn为9.71%条件下,通过合适的选矿工艺,可得到锰品位14.25%,回收率83.91%的锰精矿,为该矿的高效利用奠定了技术基础。     

Airline Network Carbon Emission Model and the Analysis of External Factors

In the face of the challenges posed by low-carbon aviation development to the aviation industry and the transformation of the emission reduction mechanism, based on the external perspective, firstly, the general expression of the environment damage model of aviation carbon emission and the element about the damage factors of carbon emission environment and the application of sensitivity analysis method were introduced and analyzed. Then, the external factors of carbon emissions in the airline network were analyzed systematically—The influence of the flight operation stage (LTO phase and cruise phase), the sector distance, the flight type and the terminal area airspace. The existing research showed that the two types of airline network model about the environment damage of aviation carbon emission were in different ways and sizes, and the city-pairs was lower than the hub-spoke; the environment damage of aviation carbon emission was the formation of the above four elements with the aircraft type and airline type. The hub airport’s carbon emissions triggered a challenge to the hub-spoke airline network model. In the low-carbon economy, corresponding suggestions on the airline network model were also faced with the hinterland market.     

一次暴风雪过程中的中尺度重力波特征及其影响

应用地面自动气象站观测资料、数字化多普勒天气雷达探测资料和WRFV2.2.1中尺度数值模拟资料,分析了中尺度重力波与基本气流的相互作用,以及重力波活动对暴雪和大风天气的重要影响。结果表明,在波导中传播的中尺度重力波能够与基本气流进行动量交换,使得对流层中上层4.5—8 km气层内的水平平均风速趋于均匀,形成斜穿整个对流层的饱和湿空气急流,即"湿急流"。在高空急流出口区激发的垂直向下传播的重力波,使基本气流的水平风速在垂直方向上出现了加速和减速的交替变化,水平风加速的气层,反射率增大;水平风减速的气层,反射率减小。随着波动下传及其随基本气流的移动,反射率回波强度沿高空风的方向(由西南向东北)出现周期性变化,回波带呈西北—东南走向,强回波中心之间为宽约40 km的弱回波区。重力波下传期间,当地面气压迅速下降时,东北风快速增长,风向有明显的改变,反射率强度开始减弱;气压脊线过后,反射率降低到最低点。地面大风中心出现在反射率回波强度周期性变化的地带,沿西南—东北方向间隔着分布。雷达探测表明,对流层低层风速在风向切变层上下边界对称相等,因此推测在重力波与切变层汇合的高度层存在垂直环流,由风切变层上下边界附近的西南气流和东北气流与受重力波影响形成的垂直方向上的上升和下沉气流共同组成。切变层上方的动量通过垂直环流的下沉支到达地面,强风中心对应着下沉气流,出现在降水回波开始减弱之际。     

珠江口盆地渐‒中新世古气候及物源特征:以阳江东凹为例

珠江口盆地阳江东凹处于太平洋构造域与新特提斯构造域交汇处,地球动力学背景、构造演化历史复杂,对于盆地物源特征和物源区古气候演化方面研究比较薄弱。选取珠江口盆地阳江东凹A钻井岩心中的珠海组-韩江组砂泥岩样品,对其进行地球化学分析,结果显示,样品呈轻稀土元素富集、重稀土元素平坦的配分模式,有明显的负Eu异常特征,与花岗岩相似;Al_2O_3/TiO_2、F1-F2、La/Th-Hf和Co/Th-La/Sc判别图解表明源岩以长英质为主,并有镁铁质岩石的混入;Al_2O_3/TiO_2、Cr/Zr和Th/Sc值也体现出长英质成分为主的物源特征;(Fe_2O_3+MgO)-TiO_2、Th-Co-Zr/10和Th-Sc-Zr/10构造环境判别图解显示,大部分样品落在大陆岛弧和主动大陆边缘区域,综合研究表明源区岩石特征与中国东南沿海大面积发育的岩浆岩极为相似。化学蚀变指数(CIA)、化学风化指数(CIW)、斜长石蚀变指数(PIA)等指标以及Mg/Ca值,指示珠江口盆地阳江东凹晚渐新世至中中新世物源区经历了中等程度的化学风化,对应温暖湿润的古气候环境,且从早到晚气温降低、降水量减少。     

Effect of Sawtooth Angle on Shear Mechanical Behavior of Structural Plane

Geotechnical and Geological Engineering - In order to study the shear characteristics of sawtooth structural planes, shear tests were carried out on structural planes with different sawtooth angles...     

Experimental Study on the Rheological Shear Mechanical Behavior of Bolted Joints

Geotechnical and Geological Engineering - Landslides, which are predominantly caused by the rheological behavior of preexisting joints, occur frequently around the world and are among the most...