ζ电位测试数据稳定性的检验

本文用ＢＤＬ—Ｂ型表面电位粒径仪测定了高岭土、氧化镁、氧化铝和二氧化钛的ζ电位，结果表明数据具有较高的稳定性和可靠性     

建筑物内信息系统的雷电保护

通过对屏蔽、均压、等电位和箝位保护等主要措施介绍，以提高对室内信息系统保护的重点的认识。     

关于用有限单元法对二维构造作电阻率法模拟的几个问题

本文讨论了二维构造上电阻率法有限单元模拟的边值条件、反傅氏变换算法及波数选取等问题,并提出了相应的算法。所列举的算例表明,本文算法较好。     

各向异性水平岩层对自然电场电位曲线的影响

1) 引言现在自然电流法观察结果的解释,均假设矿体是处在均匀各向同性的介质中。实际上,围岩的不均匀和各向异性对电位曲线起着严重的崎变,因之,对结果的解释也应该作相应的校正。在这里,我们只研究最简单的均匀各向异性水平岩层对自然电场电位曲线的影响,井提出了用普通的方法从自然电位曲线上求矿体埋深时,应作的各向异性校正。     

激发电位測深法

利用金属矿体通过电流以后能产生电化学极化的現象,引起次生的激发电流,以普查勘探金属矿可以认为是研究金属矿地球物理勘探方法的一个重要进展.一般地球物理勘探方法的作用,除了磁法探寻磁鉄矿体以外,都还处于很不“直接”的阶段,例如使用重力法、电阻率剖面法、自然电流法等等所取得的物理現象,常常很难作出肯定的推断解释,因为它們常不肯定表示矿体的存在;一种現象可以为几种可能的地貭因素所引起,除非进行山地揭露,很难断定什么是現象的引起者.     

李伍式铜矿床成矿控制条件与找矿前景

本文以李伍铜矿床为典型实例,着重从矿床地质依据,较系统地论证了该矿床的形成,受构造、地层、岩性、火山岩和变质作用五位一体的控制,从而指出了普查找矿的地质标志,提出了远景区预测的初步建议.     

数字遥测地震台的雷电防护

数字遥测地震台网的系统硬件安全是一个很重要的问题，它直接关系到系统能否正常运行。而雷电是造成电子设备损坏的主要原因之一，雷电灾害被“国际十年减灾”组织列为十种最严重的自然灾害之一。本文就数字遥测地震台的雷电防护问题提出一些技术措施和解决方案。     

ULF electric and magnetic anomalies accompanying the cracking of rock sample

The anomalies of electric-magnetic field and self-potential before earthquakes are important precursory phenom-ena.A simulating experiment study on the variations in ultra-low frequency(ULF)magnetic field and self-poten-tial during rock cracking was carried out in a magnetic field-free space.The results revealing in detail the whole process of the occurrences of electric and magnetic anomalises are significant for understanding the microscopic mechanism of ULF electric and magnetic signals.The experiment indicated that at the initial stage the slow changes in strain.self-potential and magnetic field with small amounts appeared firstly near the source of initial cracking,and then extended as the crack developed on.In the time domain,the self-potential anomaly emerged first and ULF magnetic field changes arose then.The shape of the ULF electric and magnetic anomaly varied ob-viously in early-,mid-and late-term of the test.The authors attributed the pulse-like changes of self-potential to the generationj and movement of the accumulated electric charges during the cracking caused by charge separation on the crack tips within the sample.While the magnetic pulses of shorter-period at the last stage of the test,may be induced by instantaneous electric current of the accumulated charege during the cracking acceleration.The technical method and the observational results of this experiment are given in detail and the microscopic mechanism of elec-tric and magnetic precursors before earthquake are discussd in the present paper as well.