黑龙江平顶山金矿石英天然热发光特征     

刘福来 《吉林大学学报(地球科学版)》1992,(3)

对平顶山金矿中52件石英样品的天然热发光曲线特征研究表明,含金或富含金石英的热发光曲线以双峰或多峰为其主要特征,不含金的石英以单峰为其特征,石英热发光曲线特征可作为指示金矿化的一个重要标志.  相似文献   

WINDOW FACTOR ANALYSIS:THEORETICAL DERIVATION AND APPLICATION TO FLOW INJECTION ANALYSIS DATA   总被引：1，自引：0，他引：1  

EDMUND R.MALINOWSKI 《地理学报(英文版)》1992,(1)

Window factor analysis(WFA)is a self-modeling method for extracting the concentration profiles ofindividual components from evolutionary processes such as flow injection,chromatography,titrationsand reaction kinetics.The method takes advantage of the fact that each component lies in a specificregion along the evolutionary axis,called the‘window’.Theoretical equations are derived.The methodis used to extract the concentration profiles and spectra of seven bismuth species from data obtained byGemperline and Hamilton,who injected bismuth perchlorate into a flowing stream of hydrochloric acid.  相似文献   

由直线和曲线混合组成的地形符号在DCS中的处理     

郝向阳 《测绘学院学报》1995,(4)

在ＤＣＳ输出的地籍图上，有许多由直线段和曲线段组成的地物符号，用传统方法处理难以取得理想的绘图效果。本文在分析ＤＣＳ数据结构和属性码的基础上，提出了曲线部分按三次参数样条曲线逼近，讨论了直线段和曲线段的各种组合情况，并且通过正确地选择边值条件使二者之间．的连接比较符合实际。最后扼要分析了该类线段按虚线绘出时的处理方法。  相似文献   

对放射性测井中的数字滤波技术的研究     

江晓安  贺利洁 《物探与化探》1995,19(2):122-127

叙述了放射性测井中的各种数字滤波方法的基本原理和性能比较,并介绍一种新的数字滤波方法,其性能优于其它滤波方法.  相似文献   

A comparative study of closed-form hydraulic conductivity prediction models     

Epaminondas Sidiropoulos  Stavros Yannopoulos 《Advances in water resources》1993,16(6)

The Mualem and the Burdine hydraulic conductivity prediction models are considered in combination with the van Genuchten analytical retention curve, as well as the Brooks and Corey prediction model. An equivalence is presented between the retention curves of these models. A comparative study follows between hydraulic conductivities that are based on equivalent retention curves. A unified presentation of prediction models provides a framework for the whole analysis. The treatment of the equivalence problem consists in a minimization procedure characterized by uncoupling of the parameters and analytical evaluation of the objective function. Exact analytical equivalence relations are given for significant parts of the parameter ranges, and, for the remaining parts, analytical approximations are proposed. The comparisons between hydraulic conductivities are carried out via an inequality analysis. It is shown that the hydraulic conductivity of the Burdine model is less than that of the other models for extended ranges of equivalent parameters.  相似文献   

双向近场地震作用下HDR隔震梁桥地震响应研究     

李琛  徐文平  孟宪锋  赵国辉  李宇 《震灾防御技术》2020,15(1):67-76

以HDR隔震梁桥多自由度（MDOF）模型和等效双线性单自由度（SDOF）模型为研究对象，以典型近场地震动作为输入，研究HDR支座双向耦合效应对HDR隔震梁桥地震响应的影响。研究结果表明:不考虑双向耦合效应的HDR支座滞回曲线呈典型双线性；考虑双向耦合效应的HDR支座滞回曲线面积小于不考虑双向耦合效应的HDR支座滞回曲线面积。不考虑双向耦合效应的顺桥向HDR支座位移峰值d_b大于考虑双向耦合效应时，但横桥向的结果相反。近场地震作用下，对梁桥进行HDR支座隔震设计时，忽略双向耦合效应计算得到的墩底剪力峰值和弯矩峰值均偏于保守。可忽略HDR支座双向耦合效应对HDR隔震梁桥近场地震能量的影响。  相似文献   

自然观光旅游地客源市场的空间结构研究：以九寨沟及比较风景区为例   总被引：140，自引：12，他引：128  

张捷  都金康  周寅康  张思彦  潘冰 《地理学报》1999,54(4):357-364

本文以九寨沟及比较风景区为例,以游客距离衰减模式和多种距离累计曲线揭示了观光旅游地客源市场空间结构整体特征和空间距离分异特征。论文论证了九寨沟游客距离衰减曲线以Ｐａｒｅｔｏ模型为最佳,并推算了不同市场范围及不同模式的距离误差指数;通过多种距离累计曲线有效地揭示游客群入游行为及相关市场潜力等背景的空间结构特征。  相似文献   

IP找水与DDJ-1型仪器野外数据采集   总被引：7，自引：2，他引：5  

赵聚林 《物探与化探》2003,27(4):302-304

用DDJ-1型多功能激电仪对IP法二次场的长延续时段采集,可提高观测数据质量和判断数据采集的可靠性,因而观测到了反映第二层为相对高极化率的三层"K"型极化率曲线.  相似文献   

非饱和土壤水分运动参数的确定——以河南驻马店亚粘土为例   总被引：2，自引：0，他引：2  

于金霞  郭会荣  方琼 《地下水》2006,28(4):25-27

土壤水分运动参数的选取和确定是研究包气带中水分贮存和运动的基础.本文以河南驻马店亚粘土为例,进行了非饱和土壤水分运动参数的测定.通过将实测数据与经验模型拟合,将实验结果、计算结果和拟合结果进行了对比分析,发现所用的经验模型与实际数据吻合较好.研究结果表明选用的经验模型是可靠的,从而确定了土壤水分运动最优参数.  相似文献   

Reliability of rayleigh wave dispersion curve obtained from f–k spectral analysis of microtremor array measurement     

Juan C. Tokeshi  Madan B. Karkee  Yoshihiro Sugimura 《Soil Dynamics and Earthquake Engineering》2006,26(2-4):163-174

The paper utilizes previously developed microtremor simulation technique to evaluate the reliability of Rayleigh wave dispersion curve estimated by f–k spectral analysis of microtremor array measurement. The simulated microtremors are obtained for a fictitious (TEST) site. Attempt is also made to obtain the dispersion curve for two real sites (OHDATE and SKC) by inverse analysis of the microtremor array measurement using f–k spectra method. The estimated dispersion curve from simulated microtremors (TEST site) compares well with the theoretical dispersion curve, demonstrating the reliability of f–k spectra method and indicating that the estimated dispersion curve from microtremor measurements could be adequately used as the target for inverse analysis purposes. It is also demonstrated that the dispersion curve from microtremor measurements can be utilized to estimate the soil profile at OHDATE and SKC sites by inverse analysis. Results show that the theoretical dispersion curve of the fundamental mode of Rayleigh wave after the end of inverse analysis are in good agreement with the dispersion curve obtained by f–k spectral analysis of microtremor array measurement.  相似文献