Forward modelling of circular loop source and calculation of whole area apparent resistivity based on TEM

2018 ◽  
Vol 35 (2) ◽  
pp. 183-198 ◽  
Author(s):  
Jun ZHANG ◽  
Yanging WU ◽  
Hongchun YI
Keyword(s):  
Apparent Resistivity ◽  
Forward Modelling ◽  
Circular Loop

scholarly journals ANALYSIS OF COMPLEX APPARENT RESISTIVITY DATA CONJUGATING SPECTRAL INDUCED POLARIZATION AND ELECTROMAGNETIC COUPLING

2018 ◽  
Vol 36 (3) ◽  
pp. 1
Author(s):  
Taíla Crístia Souza Sant’Ana ◽  
Edson Emanoel Starteri Sampaio
Keyword(s):  
Apparent Resistivity ◽  
Mineral Exploration ◽  
Electromagnetic Coupling ◽  
Synthetic Data ◽  
Polarization Characteristic ◽  
Induced Polarization ◽  
Forward Modelling ◽  
New Approach ◽  
Spectral Induced Polarization ◽  
Geological Information

ABSTRACT. The induced polarization characteristic is to provide geophysical and geological information via geoelectric parameters, making possible mineral discrimination in the scope of mineral exploration. Although represents one of the main noises in measurements of this method, electromagnetic coupling between current and potential electrodes also contributes to the understanding of the geological scenario. Thus, the most appropriate way to deal with such data is an integrated study of these two phenomena, taking into account their particularities. Forward modelling and Gauss-Newton inversion of the mutual impedance in the frequency domain provide the analysis of the complex apparent resistivity considering both spectral induced polarization and electromagnetic coupling for homogeneous and one-dimensional, non-polarizable and polarizable Earth models. Besides synthetic data, this new approach was applied to data from the Copper District of Vale do Curaçá, Bahia, Brazil. The results reveal the ability of the method to distinguish between induction, dominant at the highest frequencies, and induced polarization, which varies with depth and frequency. It also may constitute a basis for mineral discrimination with the analysis of analogous circuit parameters, a fundamental tool in the search for metallic targets in mineral exploration.Keywords: Forward Modelling, Geophysical Inversion, Electromagnetic Method, Mineral Exploration.RESUMO. A polarização induzida espectral se destaca por fornecer diversas informações geofísico-geológicas através dos parâmetros geoelétricos, viabilizando a discriminação mineral no âmbito da exploração mineral. Embora constitua um dos principais ruídos nas medidas desse método, o acoplamento eletromagnético entre eletrodos de corrente e potencial também auxilia na compreensão do cenário geológico. Dessa forma, a maneira mais adequada de lidar com tais dados espectrais é o estudo integrado desses dois fenômenos, levando em conta suas particularidades. A modelagem direta e a inversão Gauss-Newton da impedância elétrica mútua no domínio da frequência proporcionam a análise da resistividade complexa aparente considerando tanto a polarização induzida espectral como o acoplamento eletromagnético para modelos de terra homogênea e uni-dimensional, polarizável e não-polarizável. Além do dado sintético, essa nova abordagem foi aplicada a dados reais do Distrito Cuprífero do Vale do Curaçá, Bahia, Brasil. Os resultados revelam a capacidade do método em distinguir o efeito indutivo, dominante nas mais altas frequências, e a variação da polarização induzida com a profundidade e frequência. Isso contitui um estudo base para a discriminação mineral por meio da análise de parâmetros de circuitos análogos, uma ferramenta fundamental na investigação de alvos em exploração mineral.Palavras-chave: Modelagem direta, Inversão Geofísica, Método Eletromagnético, Exploração Mineral. 1Universidade

scholarly journals Evaluation of the Circularity of Recycled PLA Filaments for 3D Printers

2020 ◽  
Vol 10 (24) ◽  
pp. 8967
Author(s):  
Victor Gil Muñoz ◽  
Luisa M. Muneta ◽  
Ruth Carrasco-Gallego ◽  
Juan de Juanes Marquez ◽  
David Hidalgo-Carvajal
Keyword(s):  
Circular Economy ◽  
Protective Equipment ◽  
Fused Filament Fabrication ◽  
Circular Loop ◽  
Material Supply ◽  
3D Printers ◽  
3D Printed ◽  
Circular Economics ◽  
High Level ◽  
Additional Value

The circular economy model offers great opportunities to companies, as it not only allows them to capture additional value from their products and materials, but also reduce the fluctuations of price-related risks and material supply. These risks are present in all kind of businesses not based on the circular economy. The circular economy also enables economic growth without the need for more resources. This is because each unit has a higher value as a result of recycling and reuse of products and materials after use. Following this circular economics framework, the Polytechnic University of Madrid (Universidad Politécnica de Madrid, UPM) has adopted strategies aimed at improving the circularity of products. In particular, this article provides the result of obtaining recycled PLA filament from waste originating from university 3D FFF (fused filament fabrication) printers and waste generated by “Coronamakers” in the production of visors and parts for PPEs (Personal Protective Equipment) during the lockdown period of COVID-19 in Spain. This filament is used in the production of 3D printed parts that university students use in their classes, so the circular loop is closed. The obtained score of Material Circularity Indicator (MCI) of this material has been calculated, indicating its high level of circularity.

A Performance Comparison of Three Topologies of Circular Loop Antennas Transmitting Systems

2021 ◽  
Author(s):  
Ferdaous Abderrazak ◽  
Eva Antonino-Daviu ◽  
Larbi Talbi ◽  
Miguel Ferrando-Bataller
Keyword(s):  
Performance Comparison ◽  
Circular Loop ◽  
Loop Antennas ◽  
A Performance

Elliptical harmonic method for gravity forward modelling of 2D bodies

2021 ◽  
Vol 95 (5) ◽  
Author(s):  
Cheng Chen ◽  
Shaofeng Bian ◽  
Motao Huang
Keyword(s):  
Forward Modelling ◽  
Harmonic Method ◽  
Gravity Forward Modelling

scholarly journals Corrections of surface fissure effect on apparent resistivity measurements

2014 ◽  
Vol 200 (2) ◽  
pp. 1118-1135 ◽  
Author(s):  
J. Gance ◽  
P. Sailhac ◽  
J.-P. Malet
Keyword(s):  
Apparent Resistivity ◽  
Resistivity Measurements

Thermo-Tectono-Stratigraphic Forward Modelling of the Upper Rhine Graben in reference to geometric balancing: Brittle crustal extension on a highly viscous mantle

2011 ◽  
Vol 509 (1-2) ◽  
pp. 1-13 ◽  
Author(s):  
Sebastian Hinsken ◽  
Stefan M. Schmalholz ◽  
Peter A. Ziegler ◽  
Andreas Wetzel
Keyword(s):  
Upper Rhine Graben ◽  
Crustal Extension ◽  
Forward Modelling ◽  
Rhine Graben ◽  
Upper Rhine

Apparent resistivity of azimuthal anisotropy layered media

2002 ◽  
Vol 15 (5) ◽  
pp. 526-532
Author(s):  
Ai-guo Ruan ◽  
Tong-en Mao ◽  
Qing-he Li ◽  
Shuang-cheng Ge
Keyword(s):  
Apparent Resistivity ◽  
Layered Media ◽  
Azimuthal Anisotropy
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