Electromagnetic Induction Techniques -
Electromagnetic Induction Techniques -

Author: PG Cook

Publisher: CSIRO PUBLISHING

Published: 1998-08-01

Total Pages: 20

ISBN-13: 064310609X

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Electromagnetic induction (EM) techniques are used in recharge/discharge studies by providing measurements of the apparent electrical conductivity of soil profiles. This booklet provides a summary of EM techniques that are most widely used. A number of case studies are presented which demonstrate the applications of the techniques to field problems.

Electromagnetic Induction Phenomena
Electromagnetic Induction Phenomena

Author: David Schieber

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 307

ISBN-13: 3642710158

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From an engineering perspective, Electrodynamics is the province of two cul tures. The most easily identified of the two is primarily concerned with phe nomena in which the propagation of electromagnetic waves is crucial. Includ ed are the designers of microwave circuits, of antennae and of many-wave length communication channels. The interests of the second group focus on dynamical processes associated with the evolution of field sources, whether these be electrons and holes migrating in a semiconductor, or currents diffus ing in a moving metal. Because the second culture is primarily concerned with the interaction be tween electromagnetic fields and media, where the latter are often responsible for the dominant dynamical processes, it addresses applications that are more widely ranging. A few from a very long list would include electrostatic print ing, rotating machines, power transmission apparatus, the electromagnetics of biological systems and physical electronics. Whether by nature or by de sign, the phenomena of interest are generally electro quasi static or magneto quasistatic in this second branch of electrodynamics. It is tempting to say that the two branches of electrodynamics can be distinguished by the frequency range, but electron-beam and microwave-magnetic devices, with their respec tive plasma oscillations and spin waves, are examples where the frequencies can be in the GHz range while the fundamental interactions are quasistatic. By design, so also are those that determine the frequency response of a transistor.

Proximal Soil Sensing
Proximal Soil Sensing

Author: Raphael A. Viscarra Rossel

Publisher: Springer Science & Business Media

Published: 2010-07-25

Total Pages: 440

ISBN-13: 9048188598

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This book reports on developments in Proximal Soil Sensing (PSS) and high resolution digital soil mapping. PSS has become a multidisciplinary area of study that aims to develop field-based techniques for collecting information on the soil from close by, or within, the soil. Amongst others, PSS involves the use of optical, geophysical, electrochemical, mathematical and statistical methods. This volume, suitable for undergraduate course material and postgraduate research, brings together ideas and examples from those developing and using proximal sensors and high resolution digital soil maps for applications such as precision agriculture, soil contamination, archaeology, peri-urban design and high land-value applications, where there is a particular need for high spatial resolution information. The book in particular covers soil sensor sampling, proximal soil sensor development and use, sensor calibrations, prediction methods for large data sets, applications of proximal soil sensing, and high-resolution digital soil mapping. Key themes: soil sensor sampling – soil sensor calibrations – spatial prediction methods – reflectance spectroscopy – electromagnetic induction and electrical resistivity – radar and gamma radiometrics – multi-sensor platforms – high resolution digital soil mapping - applications Raphael A. Viscarra Rossel is a scientist at the Commonwealth Scientific and Industrial Research Organisation (CSIRO) of Australia. Alex McBratney is Pro-Dean and Professor of Soil Science in the Faculty of Agriculture Food & Natural Resources at the University of Sydney in Australia. Budiman Minasny is a Senior Research Fellow in the Faculty of Agriculture Food & Natural Resources at the University of Sydney in Australia.

Geoelectromagnetic Investigation of the Earth’s Crust and Mantle
Geoelectromagnetic Investigation of the Earth’s Crust and Mantle

Author: I.I. Rokityansky

Publisher: Springer

Published: 2011-10-09

Total Pages: 0

ISBN-13: 9783642618031

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Electrical conductivity is a parameter which characterizes composition and physical state of the Earth's interior. Studies of the state equations of solids at high temperature and pressure indicate that there is a close relation be tween the electrical conductivity of rocks and temperature. Therefore, measurements of deep conductivity can provide knowledge of the present state and temperature of the Earth's crust and upper mantle matter. Infor mation about the temperature of the Earth's interior in the remote past is derived from heat flow data. Experimental investigation of water-containing rocks has revealed a pronounced increase of electrical conductivity in the temperature range D from 500 to 700 DC which may be attributed to the beginning of fractional melting. Hence, anomalies of electrical conductivity may be helpful in identitying zones of melting and dehydration. The studies of these zones are perspective in the scientific research of the mobile areas of the Earth's crust and upper mantle where tectonic movements, processes ofthe region al metamorphism and of forming mineral deposits are most intensive. Thus, in the whole set of research on physics of the Earth the studies of electrical conductivity of deep-seated rocks appear, beyond doubt, very important.

Soil Salinity Assessment
Soil Salinity Assessment

Author: J. D. Rhoades

Publisher: Food & Agriculture Org.

Published: 1999

Total Pages: 172

ISBN-13: 9789251042816

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Determination of soil salinity from aqueous electrical conductivity; determination of soil salinity from soil-paste and bulk soil electrical conductivity; example uses of salinity assessment technology; operational and equipment costs associated with salinity instrumentation measurement techniques.