MATLAB在深层构造预测中的应用——以房山张坊水源地为例     

孙少游  马静晨  刘全国  杨楠  潘懋 《城市地质》2017,12(1)

利用MATLAB强大的分析能力,基于北京房山岩溶区浅层节理裂隙数据的进行性半自动化的统计与分析,绘制浅层节理裂隙玫瑰花图,并提取深层构造的走向线,最后与深层断层、向斜与背斜等构造进行拟合。拟合结果显示,北京房山岩溶地区浅层节理裂隙的统计走向与深层构造走向基本一致,北东向与北西向两条主构造方向的拟合误差分别为6.4%和2.1%。这一误差远小于设置的15%的误差容限,表明此代码在利用预测深层构造的应用中具有一定的正确性与潜力,能够为野外数据的分析统计提供简洁有效的帮助。但方法的有效性,仍需要通过更多的实例进行验证。  相似文献   

BDS/INS深组合导航性能分析     

戴卿  常允艳 《大地测量与地球动力学》2017,37(2):209-214

通过对BDS/INS深组合导航进行较为全面的性能分析（重点针对INS辅助BDS捕获、跟踪环路机理及性能评判准则）发现,在INS辅助下可以显著提高BDS信号捕获灵敏度、缩短平均捕获时间,并可以维持环路的锁定跟踪状态以提高导航精度。同时,考虑GNSS接收机受到超强干扰或卫星信号受到持续遮挡等特殊条件,给出BDS/INS深组合的结构设计,并基于软件接收机对深组合导航系统性能进行仿真分析。该仿真结果对工程应用具有参考价值。  相似文献   

湖南花垣地区礁灰岩型铅锌矿成矿特征及找矿方向     

任爱君  毛党龙  陈伦杰 《国土资源导刊(湖南)》2017,14(1)

在花—张断裂带两侧分布着众多铅锌矿床,这些矿床赋存于寒武系下统的海相礁灰岩中,受岩性和断裂控矿明显,以层状、似层状为主,成矿流体为高盐度热卤水的沉积岩型铅锌矿床,有着特殊的成矿背景及成矿条件,与MVT相似、但有不同特征的铅锌矿床,称之为"礁灰岩型"铅锌矿床。通过阐述近年发现的"礁灰岩型"铅锌矿床的成矿特征,圈定该类矿床的找矿潜力地段,以期为找到更多的礁灰岩型铅锌矿床提供参考。  相似文献   

柿竹园矿床S同位素地球化学研究     

王谦  莫南  毛彦东 《国土资源导刊(湖南)》2017,14(2)

通过硫同位素低温平衡系统,分析平衡条件下δ~(34)S_(H_2S)与δ34S热液偏差,获得成矿流体的含硫组分以H_2S为主。成矿阶段δ~(34_S值变化范围狭窄,呈塔式分布,具有岩浆硫特征,柿竹园矿床矿石中的硫来自岩浆流体,即千里山花岗岩。硫同位素fO_2—pH值关系图,投影得出350℃时,fO_2为-28.3~-31.5;250℃时,fO_2为-35.4~-37.5。  相似文献   

于DEM光照晕渲模拟的梯田自动提取方法     

代文  那嘉明  杨昕  曹建军 《地球信息科学学报》2017,19(6):754-762

梯田作为黄土高原最为典型的人工地貌之一,有重要的农业生产和水土保持价值。传统的梯田自动提取仅限于梯田所在区域的范围划定,未能对梯田田坎线实现有效的自动化提取。鉴于此,本文提出了一种基于光照晕渲模拟的梯田快速提取方法。首先,对无人机航测生成的1 m分辨率的数字高程模型（DEM）进行4个方向的光照晕渲模拟,并相加取平均值;然后,通过适当的阈值对均值图像进行二值化,并掩膜掉沟谷等非梯田区域;最后,基于二值化图像自动矢量化得到梯田田坎线,并通过适当的长度阈值进行碎线过滤提高提取精度。本文以陕西省长武县王东沟流域为实验样区进行了实验,结果表明,该方法提取结果的准确率为89.09%,具有较好的提取精度。此外,对该方法涉及到的参数进行了讨论,表明光照模拟的方向角采用2个正交的对称方向对、高度角采用田坎坡度的反正切值、二值化阈值采用t=180-σ的经验公式,可以满足黄土高原的梯田自动快速提取。  相似文献   

基于GNSS和SLR观测数据的北斗卫星(GEO/IGSO)精密定轨     

卿芸  楼益栋  戴小蕾 《大地测量与地球动力学》2017,37(5):467-471

研究了联合GNSS和卫星激光测距（satellite laser ranging,SLR）观测数据对北斗卫星定轨精度的影响。仅利用GNSS观测值对北斗卫星进行定轨时,C01、C08和C10卫星的SLR检核结果显示,这3颗卫星的SLR残差均存在一定的偏差且不相同。加入SLR观测值联合定轨时,分别对估计和不估计系统偏差的卫星轨道结果进行分析。结果显示,对C01（GEO）卫星加入SLR观测值时必须引入系统偏差,否则会使轨道偏离;C08和C10（IGSO）卫星估计和不估计系统偏差时对预报轨道的精度均有一定的改善。最后统计了这3颗卫星的系统偏差,C01卫星的系统偏差达到50 cm,C08和C10卫星的系统偏差在5 cm以内。  相似文献   

Purification and characterization of an alkaline protease from <Emphasis Type="Italic">Micrococcus</Emphasis> sp. isolated from the South China Sea     

Enling Hou  Tao Xia  Zhaohui Zhang  Xiangzhao Mao 《中国海洋大学学报(英文版)》2017,16(2):319-325

Protease is wildly used in various fields, such as food, medicine, washing, leather, cosmetics and other industrial fields. In this study, an alkaline protease secreted by Micrococcus NH54PC02 isolated from the South China Sea was purified and characterized. The growth curve and enzyme activity curve indicated that the cell reached a maximum concentration at the 30th hour and the enzyme activity reached the maximum value at the 36th hour. The protease was purified with 3 steps involving ammonium sulfate precipitation, ion-exchange chromatography and hydrophobic chromatography with 8.22-fold increase in specific activity and 23.68% increase in the recovery. The molecular mass of the protease was estimated to be 25 kDa by SDS-PAGE analysis. The optimum temperature and pH for the protease activity were 50°C and pH 10.0, respectively. The protease showed a strong stability in a wide range of pH values ranging from 6.0–11.0, and maintained 90% enzyme activity in strong alkaline environment with pH 11.0. Inhibitor trials indicated that the protease might be serine protease. But it also possessed the characteristic of metalloprotease as it could be strongly inhibited by EDTA and strongly stimulated by Mn²⁺. Evaluation of matrix-assisted laser desorption ionization/time-of-flight MS (MALDI-TOF-TOF/MS) showed that the protease might belong to the peptidase S8 family.  相似文献   

Precise Synchrotron Radiation Spectrum of Fast-cooling Electrons and the Prompt GRB Emission     

Zhu Mao  Pi-Bo Yang 《Chinese Astronomy and Astrophysics》2009

It is generally believed that the synchrotron radiation of electrons from the internal shock is the main radiation mechanism of the prompt GRB (gamma-ray burst) emission. However, what this model predicts can not explain observations well. In this paper, we confirm that electrons are quickly cooled due to radiation losses and also point out that the synchrotron radiation spectrum presented in previous papers is a relatively rough estimation. We get the precise synchrotron radiation spectrum of fast-cooling electrons by carrying out a numerical calculation, and thereby reasonably explain the observed distribution of low-energy spectral index (α) of long GRBs based on a unified model. In addition, we fit the correlation between α and the peak energy of the νFν spectrum (E_p).  相似文献   

Elastic anisotropy of ferromagnesian post-perovskite in Earth's D” layer     

Wendy L. Mao  Yue Meng  Ho-kwang Mao 《Physics of the Earth and Planetary Interiors》2010,180(3-4):203-208

We report experimental observation of a sizable elastic anisotropy in a polycrystalline sample of ferromagnesian silicate in post-perovskite (ppv) structure. Using a novel composite X-ray transparent gasket to contain and synthesize ppv in a panoramic diamond-anvil cell along with oblique X-ray diffraction geometry, we observed the anisotropic lattice strain and {1 0 0} or {1 1 0} slip-plane texture in the sample at 140 GPa. We deduced the elasticity tensor (c_ij), orientation-dependent compressional wave velocities, polarization-dependent shear-wave velocities, and the velocity anisotropy of the silicate ppv. Our results are consistent with calculations and indicate that with sufficient preferred orientation, the elastic anisotropy of this phase can produce large shear-wave splitting.  相似文献   

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马晨旭  许才军  张琼  茅盛 《大地测量与地球动力学》2010,30(1):83-87

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