Efficient processing power harmonic noise with fluctuation frequency in urban transient electromagnetic surveys

2021 ◽  
Vol 92 (4) ◽  
pp. 044501
Author(s):  
Sihe Huang ◽  
Shengjie Wang ◽  
Yishu Sun ◽  
Yang Zhang
Keyword(s):  
Transient Electromagnetic ◽  
Processing Power ◽  
Fluctuation Frequency ◽  
Efficient Processing ◽  
Harmonic Noise ◽  
Electromagnetic Surveys

Transient electromagnetic fields of a buried horizontal magnetic dipole

Geophysics ◽  
2016 ◽  
Vol 81 (6) ◽  
pp. E481-E491 ◽  
Author(s):  
Andrei Swidinsky ◽  
Misac Nabighian
Keyword(s):  
Electric Field ◽  
Magnetic Dipole ◽  
Time Domain ◽  
Major Axis ◽  
Secondary Response ◽  
Burial Depth ◽  
Transient Electromagnetic ◽  
The Earth ◽  
Smoke Ring ◽  
Electromagnetic Surveys

Electromagnetic surveys using a vertical transmitter loop are common in land, marine, and airborne geophysical exploration. Most of these horizontal magnetic dipole (HMD) systems operate in the frequency domain, measuring the time derivative of the induced magnetic fields, and therefore a majority of studies have focused on this subset of field measurements. We examine the time-domain electromagnetic response of a HMD including the electric fields and corresponding smoke rings produced in a conductive half-space. Cases of a dipole at the surface and buried within the earth are considered. Results indicate that when the current in the transmitter is rapidly switched off, a single smoke ring is produced within the plane of the vertical transmitter loop, which is then distorted by the air-earth interface. In this situation, the circular smoke ring, which would normally diffuse symmetrically away from the source in a whole space, is approximately transformed into an ellipse, with a vertical major axis at an early time and a horizontal major axis at a late time. As measured from the location of the transmitter, the depth of investigation and lateral footprint of such a system increases with burial depth. It is also observed that the electric field measured in the direction of the magnetic dipole only contains a secondary response related to the charge accumulation on any horizontal conductivity boundaries because the primary field is always absent. This field component can be expressed analytically in terms of a static and time-varying field, the latter term adding spatial complexity to the total horizontal electric field at the earth surface at early times. Applications of this theoretical study include the design of time-domain induction-logging tools, crossborehole electromagnetic surveys, underground mine expansion work, mine rescue procedures, and novel marine electromagnetic experiments.

scholarly journals Transient Electromagnetic Surveys for the Determination of Talik Depth and Geometry Beneath Thermokarst Lakes

2018 ◽  
Vol 123 (11) ◽  
pp. 9310-9323 ◽  
Author(s):  
A. L. Creighton ◽  
A. D. Parsekian ◽  
M. Angelopoulos ◽  
B. M. Jones ◽  
A. Bondurant ◽  
...  
Keyword(s):  
Thermokarst Lakes ◽  
Transient Electromagnetic ◽  
Electromagnetic Surveys

scholarly journals SkyTEM helicopter transient electromagnetic surveys of tailings dams

2012 ◽  
Vol 2012 (1) ◽  
pp. 1-4 ◽  
Author(s):  
James Reid ◽  
Niels Christensen ◽  
Kate Godber
Keyword(s):  
Transient Electromagnetic ◽  
Tailings Dams ◽  
Electromagnetic Surveys

Transient electromagnetic surveys for highresolution near-surface exploration: basics and case studies

First Break ◽  
2017 ◽  
Vol 35 (9) ◽  
Author(s):  
M.V. Sharlov ◽  
I.V. Buddo ◽  
N.V. Misyurkeeva ◽  
I.A. Shelokhov ◽  
Yu.A. Agafonov
Keyword(s):  
Case Studies ◽  
Near Surface ◽  
Transient Electromagnetic ◽  
Surface Exploration ◽  
Electromagnetic Surveys

scholarly journals Merkle Hash Tree with Hash based Digital Signature for Cloud Data Confidentiality and Security

2019 ◽  
Vol 8 (2S8) ◽  
pp. 412-416
Keyword(s):  
Digital Signature ◽  
Data Security ◽  
Data Recovery ◽  
Data Confidentiality ◽  
Cloud Data ◽  
Processing Power ◽  
Merkle Hash Tree ◽  
Efficient Processing ◽  
Cloud Servers ◽  
Computation Speed

It provides efficient processing power, an unbelievable computation speed and a wide array of stage space.Basically, the cloud computing transfer the huge volume of data on the different cloud servers which is maintained by the different kinds of cloud providers and this process help to remove the physical data’s possession even though user are the data owners. This extraordinary element coordinates to raise the innumerable new security disadvantages which have not been surely known obviously. Consequently, in this paper present a novel methodology for secure cloud information stockpiling with the assistance of Merkle Hash Tree (MHT) with hash based advanced mark to give trustworthiness and protection of redistributed information in cloud using private key security approach. Additionally, in this work use theAdvanced Encryption Standard (AES) for conforming the data confidentiality and data security before the data is stored into the cloud. The simulation results show the better results in term of Data Recovery Time, Processing time, and efficiency respectively

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