频波谱在地震噪声分析与衰减中的应用   总被引：5，自引：0，他引：5  

梁传坤 《物探与化探》1995,19(1):34-40

论文首先指出了利用野外试验记录和一维谱资料分析地震噪声的局限性,提出了利用频波谱(简称f-k谱)分析地震噪声的观点.接着以实例详细论述了f-k谱在研究噪声特征、为二维滤波提供最佳参数和分析野外工作参数的地质效果等方面的应用方法.实践证明,f-k谱为分析和衰减地震噪声提供了定量的依据,对指导野外采集和资料处理,提高地震资料的信噪比和分辨率有一定的参考价值.  相似文献   

烃类微渗漏的光谱遥感信息     

刘子贵  李钦雄  王錾 《遥感学报》1992,(1)

烃类微渗漏的间接证据,包括一系列地球物理、地球化学、岩石矿物和地貌异常以及以后认识到的在土壤化学与植物生理方面引起的变异。所有这些现象均与烃类微渗漏密切相关。根据这种地表“蚀变体”的波谱特征,可利用遥感技术在特定波段内将其信息直接提取出来。  相似文献   

水解—火焰原子吸收法测定地质样品中高含量铂   总被引：1，自引：0，他引：1  

龙小玲  苏晓 《矿物岩石》1991,11(1):111-113

本文研究了在空气-乙炔火焰中于pH6—8的水相介质直接进行贵金属铂(1V)的测定方法。测定的灵敏度0.5μg/ml 1％;2.5μg/ml,RSD(n=4)1.26％。在部分铜镍矿和黄铁矿地质样品中进行人工模拟试验,表明该法是可行的,可以测定同类地质样品中0.000 x％以上的铂。  相似文献   

Sample preparation effects on illite crystallinity measurement: grain-size gradation and particle orientation   总被引：6，自引：0，他引：6  

S. KRUMM  W. BUGGISCH 《Journal of Metamorphic Geology》1991,9(6):671-677

Abstract Specimen thickness is the main experimental factor controlling the results of illite crystallinity (IC) or crystallite size measurements on sedimentation slides. Different values obtained from thick and thin preparations are due to grain-size gradation effects, which may exclude larger and higher ordered grains from contributing to the diffraction. Orientation effects control the measured peak intensity. The change from poor particle orientation in thick slides to high orientation in very thin slides is marked by an increase in specimen density, diminishing non-basal reflections, and by a strong increase in peak intensity. A plateau with constant peak breadths is observed if thin slides of well ordered, platy illites are used. A similar plateau can be recognized for thick preparations of specimens from less ordered materials, but not from well ordered ones. Therefore, it is suggested that IC is determined on very thin sedimentation slides with a thickness of 0.25 mg/cm² or less. Ultrasonic and H₂O₂ treatments enhance the degree of particle orientation by destruction of grain aggregates and organic compounds, leading to smaller peak breadths and higher intensities.  相似文献   

氢化物发生-火焰分子发射光谱法测定地质样品中的砷   总被引：2，自引：0，他引：2  

郭小伟  胡晓温  陈德芳 《岩矿测试》1991,(1)

本文研究了氢化物发生-火焰分子发射光谱测定地质样品中As的方法,提出并采用了一种新型分子发射炉(腔)——长缝式石英炉。该方法具有设备简单、操作方便、干扰少、线性动态范围宽等特点。方法检出限为0.02μg/ml,对0.5μg/ml As的样品测定,其RSD(n=10)为1.5％。用GSS及MGD系列部分标样验证了方法的可靠性。  相似文献   

低位数线阵CCD高精度非接触尺寸测量     

马秦生 《武汉大学学报(信息科学版)》1989,(4)

从提高测量精度、增大测量范围、经济、实用的角度出发,本文分析了常用的两种线阵CCD非接触尺寸测量方式存在的问题,提出了“单眼”单端扫描测量方式,并设计出了适合测量应用的线阵CCD驱动电路和计算机通用接口。通过实验,证明此方法是行之有效的。  相似文献   

LBH—A型氦探测仪及其应用技术     

王建谱 《铀矿地质》1989,5(1):29-34

介绍最近改进的LBH-A型氦探测仪的原理、特性、应用技术及应用领域等方而。该仪器是我国第一代能自动计数、控时、报警、接通高压和交直流两用的离子泵型测氦仪。具有探测灵敏度高,读数稳定,测量精确,轻便以及适于野外工作等特点。通过野外取样、样品分析、含量计算及资料处理等系列技术方法的研究,获得了该仪器的一套基本可行的应用技术。该仪器的改进成功地为地质找矿、地震预报、检漏等领域增添了一种先进设备和相应的应用技术。  相似文献   

Zinc Isotopic Compositions of NIST SRM 683 and Whole‐Rock Reference Materials          下载免费PDF全文

Sha Chen  Yuchen Liu  Jingya Hu  Zhaofeng Zhang  Zhenhui Hou  Fang Huang  Huimin Yu 《Geostandards and Geoanalytical Research》2016,40(3):417-432

In this study the homogeneity of the zinc isotopic composition in the NIST SRM 683 reference material was examined by measuring the Zn isotopic signature in microdrilled sample powders from two metal nuggets. Zinc was purified using AG MP‐1M resin and then measured by MC‐ICP‐MS. Instrumental mass bias was corrected using the “sample‐standard bracketing” method and empirical external normalisation with Cu doping. After evaluating the potential effects of varying acid mass fractions and different matrices, high‐precision Zn isotope data were obtained with an intermediate measurement precision better than ± 0.05‰ (δ⁶⁶Zn, 2s) over a period of 5 months. The δ⁶⁶Zn_JMC‐Lyon mean values of eighty‐four and fourteen drilled powders from two nuggets were 0.11 ± 0.02‰ and 0.12 ± 0.02‰, respectively, indicating that NIST SRM 683 is a good isotopic reference material with homogeneous Zn isotopes. The Zn isotopic compositions of seventeen rock reference materials were also determined, and their δ⁶⁶Zn values were in agreement with most previously published data within 2s. The δ⁶⁶Zn values of most of the rock reference materials analysed were in the range 0.22–0.36‰, except for GSP‐2 (1.07 ± 0.06‰, n = 12), NOD‐A‐1 (0.96 ± 0.03‰, n = 6) and NOD‐P‐1 (0.78 ± 0.03‰, n = 6). These comprehensive data should serve as reference values for quality assurance and interlaboratory calibration exercises.  相似文献   

浅谈我国某金红石矿采样设计     

卿得成 《国土资源导刊(湖南)》2016,(4):80-83

选矿试验采样设计是一项复杂而又重要的工作,确保试样的代表性是采样设计工作的关键。本文以我国某金红石矿为例,根据矿床地质特征和矿石的性质,综合考虑影响矿石代表性的各种因素,对其进行了采样设计,以确保能够采出满足试验要求、且具有带表性的试验样品。对类似项目具有一定的指导和借鉴意义。  相似文献   

因子交配设计中文蛤亲本数目对遗传参数估计的影响     

梁冰冰  岳欣  王鸿霞  刘保忠 《海洋学报(英文版)》2016,35(6):42-49

The precise and accurate knowledge of genetic parameters is a prerequisite for making efficient selection strategies in breeding programs.A number of estimators of heritability about important economic traits in many marine mollusks are available in the literature,however very few research have evaluated about the accuracy of genetic parameters estimated with different family structures.Thus,in the present study,the effect of parent sample size for estimating the precision of genetic parameters of four growth traits in clam M.meretrix by factorial designs were analyzed through restricted maximum likelihood(REML) and Bayesian.The results showed that the average estimated heritabilities of growth traits obtained from REML were 0.23–0.32 for 9 and 16 full-sib families and 0.19–0.22 for 25 full-sib families.When using Bayesian inference,the average estimated heritabilities were0.11–0.12 for 9 and 16 full-sib families and 0.13–0.16 for 25 full-sib families.Compared with REML,Bayesian got lower heritabilities,but still remained at a medium level.When the number of parents increased from 6 to 10,the estimated heritabilities were more closed to 0.20 in REML and 0.12 in Bayesian inference.Genetic correlations among traits were positive and high and had no significant difference between different sizes of designs.The accuracies of estimated breeding values from the 9 and 16 families were less precise than those from 25 families.Our results provide a basic genetic evaluation for growth traits and should be useful for the design and operation of a practical selective breeding program in the clam M.meretrix.  相似文献