关于改进高密度电阻率法数据采集方法的设想

运用地面点电流源电场的分布规律和高密度电阻率法的基本思想,提出了分别利用单极供电、偶极子供电,其余电极同时测量,通过室内数据整理实现高密度电阻率法的温纳对称四极、温纳偶极、温纳微分、温纳三极A、温极三极B和二极等装置.     

不同装置下点源球体的近似解与精确解对比

针对利用简单加倍的方法求解点源球体解析解的局限性,采用双球坐标系,通过镜像法求解点源下球体的精确解,将其与简单加倍求得的近似解进行对比,给出了简单加倍方法的适用条件,从而在实际中能够更准确地使用简单加倍的方法.研究结果表明:对于二极装置,当球心埋深h≤1.5r0时,利用简单加倍方法求得的近似解与精确解的误差已达到10％以上;对于中梯装置,当球心埋深h≤1.7r0时,二者的误差达到10％;二极装置的视电阻率曲线随着极距AM的增加会出现反向异常的现象,且极距越大,反向异常越明显.     

物探方法在找水工作中的应用

本次物探找水应用音频大地电位法通过在地表测量和分析某些频段组合场Ef的信号特征,区分出异常电场,达到探测低电阻异常区。低频率曲线反映深部电阻率信息,高频率曲线反映浅部电阻率信息。甚低频电磁法测量某些参数的畸变,发现地下的良导体或磁性感应体的存在。圈定矿体、岩溶发育带,地下河,含水或矿化断裂带,隐伏构造,以及进行快速电阻率填图。电阻率测深法采用不同极距的视电阻率对应于不同深度电阻率值,由各测深点的不同极距视电阻率值,绘出断面等值线图,判断低阻带的空间分布及倾向特征,结合水文地质资料,推断含水区位置。     

用边界积分方程法对地下目标体基本定位

利用边界积分方程数值模拟法研究了均匀半空间 (地下 )多个三维体条件下的地表视电阻率响应 .此外 ,在微分测深、温纳尔测深及耦极 耦极测深装置下 ,分析了三维地质体的地表视电阻率响应及异常形态与地质体几何参数的对应关系 .通过数值模拟得出了地面各类装置的测深资料特征与地下 (电性 )不均匀体几何参数的基本对应规律以及进行空间定位的方法 ,为目标体成像奠定了基础     

平凉深井观测地电阻率影响系数特征分析

利用平凉台地下水平介质电性结构,通过正演计算出影响系数,分析研究平凉深井四极对称观测装置在地层中不同深度和不同供电极距下,影响系数的变化规律,以及装置布设在何种情况下能有效的减小或消除地表对地电阻率观测的干扰,并最大限度的加强观测深部电阻率变化的能力。结果表明,平凉台在第4层即地下50~210 m的介质影响系数始终是最显著的,底层影响系数会随装置埋深的增加而增大,但增大的幅度较小;从浅层影响系数的变化中发现,极距布设的增大能有效压制地表干扰。综合考虑台站的建设和运行维护成本,平凉深井观测布设的极距分布以及观测装置的埋深是较为理想的。     

矿井三维电法对封闭不良钻孔的探测

封闭不良钻孔是影响矿区安全生产的重要隐患之一,不良钻孔具有导通工作面顶板上含水层,增强顶板砂岩的富水性.针对这一问题,将直流电法电极顶入工作面顶板上,采用分站式进行数据采集工作.数据采集完成后,经过数据预处理和无穷远校正及巷道校正、剔除旁侧干扰等处理,将二维电阻率格式转换成三维电阻率格式,使用圆滑最小二乘法对数据进行反演,将反演完成后的数据导入三维可视化成图,圈定钻孔附近岩层富水区,为矿井水防治工作者提供决策.经工程验证后,说明该方法具有很强实用价值及推广价值.     

高密度电阻率法在幕府山勘探中的应用

高密度电阻率法是把很多电极同时排列在测线上,通过对电极自动转换器的控制,实现电阻率法中各种不同装置、不同极距的自动组合,从而一次布极可测得多种装置、多种极距情况下多种视电阻率参数的方法,本文通过高密度电阻率法在南京幕府山勘察中的应用,取得了较好的勘探效果。     

聚焦电流法隧道超前预报电极布置研究

提出了两种聚焦电流电极布置方式（只用屏蔽电极探测的A-M-A1装置和在屏蔽电极中间再加一电极同时供电的A-M-A0-M1-A1装置）进行隧道超前预报探测。通过导电纸实验证明当掌子面不断接近异常体时观测电位不断下降,聚焦电流进行超前预报是可行的;A-M-A0-M1-A1装置比A-M-A1装置效果较好;超前探测距离与异常体电极距有关。     

重金属污染场探测装置抗噪性能与灵敏度比较

为比较对称四极与三极电测深装置在重金属污染场探测过程中的抗噪性能与灵敏度，基于电场理论推导两探测装置信号强度关系与灵敏度方程。建立层状重金属污染场地二维模型，正演模拟视电阻率和视极化率变化规律，分别在无噪声、平均值5mV的扰动电压、5%随机噪声工况下，反演模拟两种探测装置视电阻率和视极化率误差。建立均匀大地介质和二层水平均匀介质模型，利用Comsol软件对两探测装置进行灵敏度仿真分析。研究结果表明：相同极距与隔离系数布极方式下，对称四极装置信号强度是三极装置的2倍；对称四极装置纵向灵敏度对称平行分布，纵向分辨率高，三极装置灵敏度横向包络大，横向分辨率高，且探测深度大于对称四极装置。     

浊积岩储层泥质含量计算方法及其应用

浊积岩储层中受放射性矿物和地层水矿化度的影响,使得自然伽马曲线和自然电位曲线不能真实地反映储层泥质含量情况.研究中发现,含水地层电阻率曲线与泥质含量有很好的相关性.而对油、气、水组合复杂的地层,直接利用电阻率曲线计算泥质含量效果不好.利用地层电阻率与含油性的关系对电阻率曲线进行油气校正,得到相应含水地层的电阻率数值,然后再用校正后的电阻率曲线计算泥质含量.将该方法用于计算辽河西部凹陷高升、冷东、兴隆台、曙光4个油田的浊积岩储层泥质含量.实际应用证明.用校正后的电阻率曲线求取的泥质含量精度大大提高.从而提高了对测井资料解释及其他储层参数求取的精度.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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