In the last decades, helicopter-borne electromagnetic (HEM) method became a focus of interest in the fields of mineral exploration, geological mapping, groundwater resource investigation and environmental monitoring. As a standard approach, researchers use 1-D inversion of the acquired HEM data to recover the conductivity/resistivity-depth models. Since the relation between HEM data and model ...

The Australasian Association: P. MARSHALL 537 Scientific Books:Mason on Aboriginal Basketry: PROFESSOR LIVINGSTON FARRAND. Arnold on the Paleontology and Stratigraphy of the Marine Pliocene and Pleistocene of San Pedro, Cal.: PROFESSOR JOHN C. MERRIAM...... 538 Scientific Journals and Articles ............ 541 Societies and Academies:The American Philosophical Society. The American Physical Soc...

With the large-scale construction and rapid development of underground engineering, a large number of underground engineering construction, such as tunnel and subway emerged. The geological structure of the tunnel is complex and the roc is fragmented. The electromagnetic tomography is a new geophysical technique in the tunnel. This method has advantages such as high resolution, high reliability...

The Neoproterozoic era was arguably the most revolutionary in Earth history. Extending from 1000 to 541 million years ago, it stands at the intersection of the two great tracts of evolutionary time: on the one side, some three billion years of pervasively microbial 'Precambrian' life, and on the other the modern 'Phanerozoic' biosphere with its extraordinary diversity of large multicellular org...

magnetic data inversion has a prominent role in geo-structural investigations. as lots of geological structures, such as faults, dykes, contacts etc are elongated in a specific direction, 2d algorithms became widespread during the previous years. modifying the existing algorithms on 3d data inversion, a method has been proposed for 2d inversion of profile magnetic data, based on the physical pa...