相山铀矿田矿石有用共生组分研究   总被引：1，自引：0，他引：1  

林锦荣  胡志华  王勇剑  王峰 《铀矿地质》2017,(6):340-345

相山铀矿田是我国目前规模最大的火山岩型热液铀矿田,其发育碱交代型铀矿化和酸交代型铀矿化两种矿床类型。笔者通过对该矿田主要酸交代型铀矿床的物质组分研究,发现其矿石中富含Th、Mo、HREE、Y等多种有用组分,且含量普遍可达综合利用品位;有用组分主要以独立矿物、类质同像形式存在,主要赋存于铀矿体的矿化中心带富矿石中,与铀为同空间富集。因此认为,相山铀矿田酸交代型矿床的矿石中,Th、Mo、HREE、Y与铀密切相关,矿物具有共生关系;应重视Th、Mo、HREE、Y等有用组分的综合利用评价。  相似文献   

基于Monte Carlo模拟的三维剖面地质界线不确定性分析     

侯卫生  杨翘楚  杨亮  崔婵婕 《吉林大学学报(地球科学版)》2017,47(3)

三维剖面地质界线是构建三维地质结构模型的重要基础数据,其不确定性会影响三维模型的几何形态和属性分布。以单一分布为假设前提的统计学不确定性分析方法掩盖了其他概率分布特征对模型的影响。突破单一误差分布条件的假设前提,本文使用Monte Carlo方法模拟了不同概率分布情况下地质剖面数据中地质界线的抽样采集,以及地质界线空间分布的不确定性;依托地质界线空间位置与地质属性的耦合关系,提出了用地质属性概率分布实现地质界线空间不确定性的定量可视化,并结合实际地质剖面探讨了多种概率分布条件下地质界线的空间不确定性。实例研究表明,基于Monte Carlo模拟的不确定性分析方法可以突破单一误差分布假设条件,结合地质属性概率可充分揭示出建模数据的内在不确定性与模型外在要素形态之间的耦合关系。  相似文献   

DFT study of the carbonation on mineral aerosol surface models of olivine: effect of water     

Heping Xie  Wen Jiang  Zhengmeng Hou  Ying Xue  Yufei Wang  Tao Liu  Liang Tang  Dinglu Wu 《Environmental Earth Sciences》2017,76(21):732

Mineral aerosols play a significant role in gas–solid interfacial and atmospheric chemistry. Carbonation of olivine aerosol, which takes place in a multiphase reaction processes, can be an effective means to reduce the concentration of atmospheric carbon dioxide. Due to the presence of a huge reserve of silicate minerals in nature, olivine aerosol could be an ideal potential raw material for mineral carbonation for its higher reactivity with H₂O and CO₂. However, quantitative information about the carbonation process on the surface of natural olivine aerosol is not available. In this paper, calculations on the carbonation reaction processes with and without a H₂O molecule using a periodic olivine model has been carried out via the density functional theory. The pathways and their corresponding energies and structures in the carbonation reactions have been established, and the effect of water as means to reduce the energy barriers and stabilize the carbonated structures by forming hydrogen bonds has been confirmed.  相似文献   

Effect of bedding planes on wave velocity and AE characteristics of the Longmaxi shale in China     

Feng Xu  Chunhe Yang  Yintong Guo  Lei Wang  Zhenkun Hou  Haoran Li  Xiaoming Hu  Tongtao Wang 《Arabian Journal of Geosciences》2017,10(6):141

The experimental work described in this paper was carried out in order to discover more about the effects of bedding planes on wave velocity and acoustic emission (AE) characteristics of shale. Two groups of specimens, which were collected from the Longmaxi shale outcrop in Chongqing, China and cored perpendicular and parallel to the bedding planes, were tested under uniaxial compression, and the wave velocity and AE were monitored. There were obvious differences in the acoustic characteristics of shale with different bedding plane orientations. The experimental results show that (1) the average increasing rates of P- and S-wave velocities were 39.86 and 54.41%, respectively, for the specimen with a load perpendicular to the bedding planes (Y-0). The P-wave velocity and axial strain of specimen show a marked logarithmic relationship. However, the average increasing rates of P- and S-wave velocities were 5.44 and 10.54%, respectively, for the specimen with a load parallel to the bedding planes (Y-90). The good linear relationship between P-wave velocity and axial strain before failure of specimen has been built. Generally, S-wave velocity was more sensitive to axial strain than P-wave velocity. (2) AE characteristics for Y-0 showed that a few signals → quiet period → stable increase → steep increase; for Y-90: quiet period → stable increase → sudden increase → sharp increase. The AE energy for two groups of specimens was concentrated on low and middle of amplitudes (45-80 dB), but the proportion of amplitudes (80–100 dB) and the total counts of AE for Y-0 was 1.95, 2.2 times as much as that for Y-90, respectively. The results preliminarily revealed the effect of bedding orientation on the wave velocity and AE properties of shale and may provide guidance for the improvement of acoustic logging and microseismic monitoring in the field.  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   

甘肃省农村居民地震常识情况的调查分析     

钟秀梅  袁中夏  贾冠华  侯景瑞 《震灾防御技术》2012,7(2):184-192

了解农村居民对地震常识的掌握情况是做好农村震害防御工作的重要参考.本文研究设计了调查表格,对农村居民地震常识的掌握情况进行了调查.通过甘肃省16个县(区)的现场抽样调查,得到了甘肃省农村居民的地震常识掌握情况,并通过对比研究,分析了造成农村居民地震常识掌握不足以及造成差异的影响因素.基于调查结果,本文针对农村居民地震常识的掌握情况,提出了增强农村居民防震减灾知识,提高其震害防御意识的工作建议.  相似文献   

Comparison of lipids in organs of the starfish Asterias amurensis associated with different treatments     

WANG Qi  IKEGAME Keita  TAKAHASHI Koretaro  XUE Changhu  ZHANG Weinong  WANG Hongxun  HOU Wenfu  WANG Yuming 《中国海洋大学学报(英文版)》2013,12(3):413-417

Lipids were extracted from organs of the starfish Asterias amurensis associated with different treatments(raw-control,boiling and heating),and then analyzed for lipid content,lipid oxidation index,lipid classes and fatty acid composition.Results showed that boiling softened the hard starfish shells,thus facilitating the collection of starfish organs.As compared with raw organs,the boiled organs had lower water content and higher lipid content,possibly due to the loss of water-holding capacity caused by protein denaturation.Both boiling and heating increased the peroxide value(PV),thiobarbituric acid(TBA) value and carbon value(CV) of lipids.Despite slight increases in the content of complex lipids,associated lipid composition had no substantial variations upon boiling and heating.For simple lipids,the content of 1,2-diglyceride decreased in boiled and heated organs,with free fatty acids observed on thin layer chromatography(TLC).However,neither boiling nor heating significantly changed the fatty acid compositions of simple or complex lipids in starfish organs,suggesting that these two treatments had no significant effects on complex lipids in starfish organs.Together,our results indicated that boiling of starfish soon after capture facilitated the handling and extraction of useful complex lipids consisting of abundant glucosylceramide and eicosapentaenoic acid(EPA)-bounded phospholipids.  相似文献   

试论岩土工程勘察报告的编写工作     

侯跃武  薛鹏亮 《化工矿产地质》2005,27(4):249-253

岩土工程勘察报告是建筑地基基础设计和施工的重要依据。在保证外业和实验资料准确 可靠的基础上,文字报告和有关图表应按合理的程序编制。要重视现场编录、原位测试和实验资 料检查校核,使之相互吻合,相互印证。要根据岩土地质时代、成因类型、岩土性质、状态、岩 石风化程度和物理力学特征合理进行地基岩土分层。报告要充分搜集利用相关的工程地质资 料,做到内容齐全,论据充足,重点突出,正确评价建筑场地条件,地基岩土条件和特殊问题, 为工程设计和施工提供合理适用的建议。  相似文献   

大连地磁台天文方位角测量     

王治业  姜华  侯永骏 《地震地磁观测与研究》2014,35(5):120-123

论述大连地磁台天文方位角的测量原理、方法及观测结果,在地磁观测室未封顶的条件下,能在观测墩直接观测北极星,避免比测墩转角换算等因素增加的观测误差,观测精度提高.  相似文献   

有关地震烈度速报信息化发展的思考   总被引：2，自引：0，他引：2  

张晁军  李卫东  李大辉  陈会忠  侯燕燕 《国际地震动态》2010,(4):23-31

汶川8.0级地震给我们很多警示,其中之一就是地震观测系统应当在大地震后快速产出地震烈度分布图。本文对快速产出地震烈度的策略和方法进行了探讨,着重介绍了用同震位移分布快速获得地震烈度产出的方法。实现地震烈度快速产出这一目标应当走测震学、强地面运动学与信息技术有效结合的道路,这是大震后地震烈度快速产出的有效途径。  相似文献