A NOTE ON MAGNETIZED SPHERES*     

B. S. R. RAO  T. K. S. PRAKASA RAO  A. S. KRISHNA MURTHY 《Geophysical Prospecting》1977,25(4):746-757

The interpretation of total field anomalies becomes somewhat complicated, especially when an arbitrarily magnetized spherical ore mass happens to be the causative body. Even though some attempts have been made to analyze total field anomaly maps, they are often too complicated and their underlying assumptions in respect of permanent and induced components of magnetism are far from realistic. In this note, an attempt has been made to show that vertical magnetic anomalies are capable of yielding interpretation with ease and precision as far as magnetized spheres are concerned. An empirical method has been outlined for computing the magnetization inclination in the plane of the profile using the measured distances between principal maximum, principal minimum, and zero anomaly positions on a magnetic anomaly profile.  相似文献   

THE CORRELATION REFRACTION METHOD AS APPLIED TO WEATHERED ZONE STUDIES IN A GRANITE TERRAIN*     

S. BANDU RAO NAIK  G. NANDA KUMAR  M.S. VIJAYA RAGHAVA 《Geophysical Prospecting》1980,28(1):18-29

The combined observation of first and later arrivals in shallow seismic refraction surveys, particularly on hard rock terrains, is discussed. Details of experimental weathered-zone investigations by the correlation refraction method in a granite terrain (i.e. field procedure, seismograms obtained, plotting of the data, and identification of the waves are presented). Complete travel time data and interpreted subsurface sections of a few test refraction surveys are included. In one instance the interpreted results of normal and converted refracted wave data have been tested by drilling at three points along a 220 m long profile.  相似文献   

FACTOR ANALYSIS FOR INTERPRETING PETROPHYSICAL DATA ON RORO ULTRAMAFICS,SINGHBHUM DISTRICT,INDIA*     

B. NARASIMHA RAO  P.C. PAL 《Geophysical Prospecting》1980,28(1):112-118

The physical properties of the serpentinized pyroxenitic and saxonitic rocks from stratiform ultramafic complexes of Roro, Singhbhum distrct, India, are examined using principal factor (R-mode) analysis technique. The variations and inter-relations of these properties reflect the compound effects of two processes—(a) degree of serpentinization, and (b) mineralogical and other changes attendant to serpentinization. Factor analysis is thus shown to be an effective tool for petrophysical inferences.  相似文献   

DEPTH OF INVESTIGATION IN RESISTIVITY METHODS USING LINEAR ELECTRODES *     

A. APPARAO  T. GANGADHARA RAO 《Geophysical Prospecting》1974,22(2):211-223

Depths of investigation for normal (bipolar) and focusing (unipolar) linear electrode arrays have been computed following the method given earlier (Roy and Apparao 1971) both in homogeneous and layered earth. The focusing arrangement is found to be superior to normal arrangement both in regard to depth of investigation and zone of uniform depth of investigation. This analysis holds good in layered media too. Further, the depth of investigation increases with the increase in the length (2M) of the electrode and reaches a limit, 0.29L for normal and 0.50L for focusing, when the electrode attains an optimum length to satisfy the infinite condition. This optimum length of the electrode is six times the distance L of the observation point from the electrode for normal and about ten times for focusing. A contour diagram for contributions of individual ground elements to the total signal measured at the centre of focused system is also discussed.  相似文献   

对外宣传英译中对原文的适当删减     

饶成康 《成都信息工程学院学报》2004,19(1):127-130

对外宣传英译中对原文进行适当的删减为两种语言的民族思维差异所引起.从对外宣传、国外读者文化接受心理的角度,提出原文并非坚冰.如果按汉语思维行事,造直译出,势必导致译文文字堆砌,语义传达失真,因而无法很好地服务于对外宣传目的.因此,应当对原文作适当的修改和删减.  相似文献   

杭州市滨江区似大地水准面的确定及精度分析   总被引：3，自引：0，他引：3  

孙建华  马飞虎  饶琼 《测绘信息与工程》2004,29(1):11-12

介绍了通过布设足够密度且分布均匀的GPS水准联测点,建立杭州滨江区高精度、高分辨率的似大地水准面数学模型的原理和方法.  相似文献   

山东东营牛庄洼陷沙三中亚段浊积砂体储层特征及影响因素   总被引：15，自引：3，他引：15  

饶孟余  钟建华  王海侨  郭泽清 《现代地质》2004,18(2):256-262

山东东营牛庄洼陷沙三中亚段浊积砂体储层以长石细砂岩、岩屑细砂岩及粉砂岩为主 ,结构成熟度及成分成熟度均较低。储层微观特征研究表明 ,砂体中发育了剩余原生粒间孔、粘土矿物杂基内的微孔隙、粒间溶孔、粒内溶孔及微裂缝等储集空间类型 ,孔隙结构以低渗细喉型为主 ,为物性较差的中低孔、低渗型储层。通过对储层物性影响因素的研究得出 ,岩石组构、沉积微相、成岩作用和异常超压的形成与分布是影响本区浊积砂体储层物性的主要因素。其中 ,碳酸盐胶结物、硅质胶结物及自生粘土矿物是致使储层物性变差的主要原因 ,沉积物中有机质的大量生烃以及粘土矿物在转化过程中所释放出的酸性水的溶解作用是产生次生孔隙的重要因素 ,而异常超压的存在、高的地温场及烃类的早期进入是部分原生孔隙和次生孔隙得以保存的重要条件。  相似文献   

梅子沟联拱隧道中导洞锚喷支护FLAC模拟研究     

邵春  杨昌斌  陈建平  饶学治  刘贵应 《地质科技情报》2005,24(4):103-106

梅子沟联拱隧道处于复杂的浅埋地层环境中,其穿越地层多数为强风化与全风化地层.根据联拱隧道动态设计施工的实质内容和新奥法施工原理,采用三维有限元差分法(FLAC)对梅子沟隧道中导洞锚喷支护设计进行了力学响应动态模拟,并分析了锚喷支护机理以及围岩体应力场和位移变形状况,由此提出了联拱隧道合理的施工工序.  相似文献   

基于DMA的数据采集系统     

饶运涛邹继军  郑勇芸 《华东地质学院学报》2005,28(2):188-191

DMA控制器使I／O口和主存储器之间的数据直接进行读写，无需CPU的干预，系统总线由DMAC控制。由于数据不要经过CPU的中转，因此数据传送速度很高。设计基于DMA原理的数据采集系统；5-DMAC的控制下，A／D转换器的蛄果直接存入PC的主存储器；A／D的周期性启动采用定时器输出的方波自动控制，方波的频率可以根据A／D转换器的转换速度设置，提高了整个系统的工作效率。根据同样原理，可以设计出高速的数据采集系统。  相似文献   

改进型焦利氏秤与传统实验对比研究     

饶黄云  刘传安  潘小青 《华东地质学院学报》2006,29(2):197-200

针对高校教材《普通物理实验》中液体表面张力系数的测定实验存在的一些问题,进行了认真分析,指出传统实验前后所测量的一些物理量不是等精度测量,因而有必要对实验原理和公式进行修正。改进型焦利氏秤,在载物台下装有测量机构,实验测量方法有所改变,实验思路更加明确,并经实验比对,使用改进型焦利氏秤做此实验,不仅操作和计算简便,而且所得结果更接近公论值,取得了良好的效果。  相似文献