Resistivity Tensor Imaging via Network Discretization of Faraday's Law

2017 ◽  
Vol 10 (1) ◽  
pp. 1-25 ◽  
Author(s):  
Min-Su Ko ◽  
Yong-Jung Kim
Keyword(s):  
Faraday’S Law ◽  
Resistivity Tensor

Optimal approaches to manage power system decarbonation

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1447-1452
Author(s):  
Vincent Mazauric ◽  
Ariane Millot ◽  
Claude Le Pape-Gardeux ◽  
Nadia Maïzi
Keyword(s):  
Free Energy ◽  
Linear Programming ◽  
Phase Transitions ◽  
Power System ◽  
Energy System ◽  
Energy Sources ◽  
Low Carbon ◽  
Faraday’S Law ◽  
Optimal Description ◽  
Low Carbon Technologies

To overcome the negative environemental impact of the actual power system, an optimal description of quasi-static electromagnetics relying on a reversible interpretation of the Faraday’s law is given. Due to the overabundance of carbon-free energy sources, this description makes it possible to consider an evolution towards an energy system favoring low-carbon technologies. The management for changing is then explored through a simplified linear-programming problem and an analogy with phase transitions in physics is drawn.

Characterization of Impressed Current Technique to Model Corrosion of Reinforcement in Concrete

2020 ◽  
Vol 11 (1) ◽  
pp. 93-99
Author(s):  
Abu Zakir Morshed ◽  
Sheikh Shakib ◽  
Tanzim Jahin
Keyword(s):  
Immersion Time ◽  
Chloride Content ◽  
Engineering Science ◽  
Coastal Regions ◽  
Faraday’S Law ◽  
Current Technique ◽  
Corrosion Cell ◽  
Impressed Current

Corrosion of reinforcement is an important durability concern for the structures exposed to coastal regions. Since corrosion of reinforcement involves long periods of time, impressed current technique is usually used to accelerate the corrosion of reinforcement in laboratories. Characterization of impressed current technique was the main focus of this research,which involved determination of optimum chloride content and minimum immersion time of specimens for which the application of Faraday’s law could be efficient. To obtain optimum chloride content, the electrolytes in the corrosion cell were prepared similar to that of concrete pore solutions. Concrete prisms of 200 mm by 200 mm by 300 mm were used to determine the minimum immersion time for saturation. It was found that the optimum chloride content was 35 gm/L and the minimum immersion time for saturation was 140 hours. Accounting the results, a modified expression based on Faraday’s law was proposed to calculate weight loss due to corrosion. Journal of Engineering Science 11(1), 2020, 93-99

scholarly journals An Alternative Method for Calculating the Eddy Current Loss in the Sleeve of a Sealless Pump

Actuators ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 78
Author(s):  
Tomislav Strinić ◽  
Bianca Wex ◽  
Gerald Jungmayr ◽  
Thomas Stallinger ◽  
Jörg Frevert ◽  
...  
Keyword(s):  
Eddy Current ◽  
Three Dimensional ◽  
Eddy Current Loss ◽  
Theoretical Background ◽  
Air Gap ◽  
Magnetic Flux Density ◽  
Pump Impeller ◽  
Current Loss ◽  
Faraday’S Law ◽  
Transient Simulations

A sealless pump, also known as a wet rotor pump or a canned pump, requires a stationary sleeve in the air gap to protect the stator from a medium that flows around the rotor and the pump impeller. Since the sleeve is typically made from a non-magnetic electrically conductive material, the time-varying magnetic flux density in the air gap creates an eddy current loss in the sleeve. Precise assessment of this loss is crucial for the design of the pump. This paper presents a method for calculating the eddy current loss in such sleeves by using only a two-dimensional (2D) finite element method (FEM) solver. The basic idea is to use the similar structure of Ampère’s circuital law and Faraday’s law of induction to solve eddy current problems with a magnetostatic solver. The theoretical background behind the proposed method is explained and applied to the sleeve of a sealless pump. Finally, the results obtained by a 2D FEM approach are verified by three-dimensional FEM transient simulations.

Faraday's Law—Demonstration of a Teaser

1969 ◽  
Vol 37 (2) ◽  
pp. 221-221 ◽  
Author(s):  
D. R. Moorcroft
Keyword(s):  
Faraday’S Law

Joint inversion of high-frequency induction and lateral logging sounding data in earth models with tilted principal axes of the electrical resistivity tensor

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Oleg Nechaev ◽  
Viacheslav Glinskikh ◽  
Igor Mikhaylov ◽  
Ilya Moskaev
Keyword(s):  
Electrical Resistivity ◽  
High Frequency ◽  
Joint Inversion ◽  
Finite Element Approximation ◽  
Optimization Method ◽  
Multilevel Methods ◽  
Element Approximation ◽  
Resistivity Tensor ◽  
Principal Axes ◽  
High Frequency Induction

Abstract In this article, we are the first to formulate the direct and inverse problems of resistivity logging on determining the components of the electrical resistivity tensor of rocks from a set of high-frequency induction and lateral logging sounding measurements. Using a finite element approximation, high-order hierarchical basis functions, computationally efficient multilevel methods and a multistart algorithm with the DFO-LS local optimization method, we investigate the capability of reconstructing the horizontal and vertical resistivity components, as well as the tilt of the resistivity tensor principal axes with regard to the study of complex geological objects. A separate consideration is given to a realistic generalized geoelectric model of the unique hydrocarbon source with hard-to-recover reserves, the Bazhenov Formation.

Faraday’s Law Low-Cost Experiment Without Permanent Magnets

2021 ◽  
Vol 59 (5) ◽  
pp. 345-347
Author(s):  
Daniel T. M. Fontes ◽  
André Machado Rodrigues
Keyword(s):  
Permanent Magnets ◽  
Low Cost ◽  
Faraday’S Law

Electrocoagulation of synthetic dairy wastewater

2013 ◽  
Vol 67 (2) ◽  
pp. 404-409 ◽  
Author(s):  
Lech Smoczynski ◽  
Kamilla Munska ◽  
Boguslaw Pierozynski
Keyword(s):  
Anodic Dissolution ◽  
Polarization Resistance ◽  
Pollutant Removal ◽  
Dairy Wastewater ◽  
Mathematical Methods ◽  
Degree Polynomial ◽  
Practical Applications ◽  
Electrode Consumption ◽  
Faraday’S Law ◽  
Cubic Function

This study compares the effectiveness of pollutant removal from synthetic dairy wastewater electrocoagulated by means of aluminum and iron anodic dissolution. A method based on the cubic function (third degree polynomial) was proposed for electrocoagulant dosing. Mathematical methods for calculating the optimal electrocoagulant doses proved to be quite precise and useful for practical applications. The results of gravimetric measurements of electrocoagulant (electrode) consumption demonstrated that theoretical doses of Al determined based on Faraday's law were substantially lower than those produced by electrode weighing. The above phenomenon was also discussed in the light of the results of polarization resistance measurements for Al and Fe electrodes used in the study.

scholarly journals Examples of ac resistivity prospecting in archaeological research

1998 ◽  
Vol 41 (3) ◽  
Author(s):  
P. Mauriello ◽  
D. Monna ◽  
I. Bruner
Keyword(s):  
Skin Effect ◽  
Dipole Source ◽  
Electrode Polarization ◽  
Archaeological Research ◽  
Frequency Range ◽  
Buried Structures ◽  
Resistivity Survey ◽  
Resistivity Tensor ◽  
Straight Lines ◽  
Self Potential

In this paper we present the results of an alternating current resistivity survey, with a view to future tomographic processing. Two examples are given to evaluate the validity and the resolution of the method. The first in the Sabine Necropolis of Colle del Forno (Montelibretti, Rome), the second in the Etruscan settlement of Poggio Colla (Vicchio, Florence). All the measurements were carried out utilising current up to 512 Hz and a mobile dipole MN along straight lines, having two fixed current probes A and B. It was found that skin effect is uninfluential in the frequency range adopted. Given the absence of natural or artificial disturbances in the signal (e.g. electrode polarization and self potential), it was possible to perform very fast measurements with two operators only. Moreover, the use of a multiple dipole source configuration allows the calculation of the determinant of the apparent resistivity tensor. In the examples shown, this parameter detects the actual position of buried structures independently of the direction of the electric sources.

Medical Imaging of the Airway

2019 ◽  
Author(s):  
Gilbert S Tang
Keyword(s):  
Foreign Body ◽  
Medical Imaging ◽  
Mediastinal Mass ◽  
Imaging Techniques ◽  
Traumatic Injury ◽  
Spine Injury ◽  
Non Invasive ◽  
Faraday’S Law ◽  
Magnetic Resonance Imaging Mri ◽  
Abnormal Anatomy

Non-invasive imaging techniques such as ultrasonography, x-ray, computerized tomography (CT) and magnetic resonance imaging (MRI) provide details about airway anatomy that complement the physical examination. They are of particular value in patients with traumatic injury, malignancy, abscess, foreign body or mass in the airway that displace, distort, disrupt, encroach or compress airway structures in ways that may not be readily apparent otherwise. Many anesthesiologists do not receive formal training in interpreting medical imaging, and a thorough discussion of this subject is beyond the scope of this review. Interpreting the subtleties of normal and abnormal anatomy require years of experience and best left to expert radiologists. The goal here is to introduce the imaging techniques available and examples of clinical applications in airway evaluation of interest to the anesthesiologist. This review contains 12 figures, 2 tables, and 37 references. Keywords: piezoelectric effect, photoelectric interaction, Faraday’s law, pneumothorax, cervical spine injury, LeFort fracture, foreign body, airway infection, mediastinal mass

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