MATLAB在深层构造预测中的应用——以房山张坊水源地为例

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。     

湖南花垣地区礁灰岩型铅锌矿成矿特征及找矿方向

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。     

柿竹园矿床S同位素地球化学研究

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。     

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

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.     

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

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).     

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

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.     

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红树林名称与红树林湿地保护

红树林保护刻不容缓,但目前的保护现状并不乐观,尤其是在忽视其湿地本质和生态系统的情况下,单纯的有林地保护现象甚为突出。针对以上问题,从红树林名称入手指出红树林的林学渊源,理清概念,分析保护现状,并从生态系统的角度阐述了红树林湿地结构和功能的整体性,探讨和呼吁科学的管理和保护。     

基于投影体积与八叉树的三维网格模型体素化方法

使用八叉树结构生成三维多边形网格模型的体素表示,提出了基于投影体积判断体素是否位于模型内部、再利用6-邻接关系快速准确获得模型内部体素的方法,避免了Flooding方法在处理内部封闭空腔时产生的错误.实例测试表明,该文提出的体素化方法能正确处理内部含有空腔的模型,并且效率较高,在三维GIS、地学建模和CAD等体图形学相关的领域具有一定的应用价值.     

旅游规划编制体系研究

旅游规划体系包括法规体系、编制体系和运作体系三大部分。其中编制体系是由各个层次的规划形式共同组成的。建议将旅游活动空间划分为旅游区、旅游景区、旅游景点3个层次,将旅游规划编制体系分为基本序列和扩展序列两个部分。基本序列包括旅游业发展规划、旅游景区总体规划和旅游景点修建性详细规划3种形式,分别对应上述3个旅游活动空间层次。扩展序列包括若干种规划形式,也与3种旅游活动空间区域形成对应关系。