Results 211 to 220 of about 14,026 (265)
Some of the next articles are maybe not open access.
Elements, 2020
The oxidation–reduction (‘redox’) state is an important intensive property of any geologic system and is typically measured (and reported) as either the redox potential (Eh) or the oxygen fugacity (fO2). These two concepts cover the whole spectrum of geologic systems: from low-temperature aqueous and sedimentary systems to high-temperature rock-forming
Cicconi, Maria Rita +3 more
openaire +2 more sources
The oxidation–reduction (‘redox’) state is an important intensive property of any geologic system and is typically measured (and reported) as either the redox potential (Eh) or the oxygen fugacity (fO2). These two concepts cover the whole spectrum of geologic systems: from low-temperature aqueous and sedimentary systems to high-temperature rock-forming
Cicconi, Maria Rita +3 more
openaire +2 more sources
Double earth fault effects in presence of interconnected earth electrodes
IET Conference Publications, 2009The paper presents a study on the effects of double earth faults in Medium Voltage (MV) networks, in presence of electrical interconnection of the earthing systems of the secondary substations. The aim of the paper is to propose a circuit model and to find general conclusions about the effects of double earth faults in presence of interconnected ...
RIVA SANSEVERINO, Eleonora +2 more
openaire +2 more sources
The resistance of earth electrodes
Journal of the Institution of Electrical Engineers, 1933This paper, which is an abridgement of a report† prepared by the E.R.A., deals briefly with the most important aspects of the resistance of electrodes used for earthing electrical installations and apparatus. After comparing the practice in various countries, details are given of the effect of the resistivity of the soil and the size and lay-out of ...
P.D. Morgan, H.G. Taylor
openaire +1 more source
Performance of Earthing Systems for Different Earth Electrode Configurations
IEEE Transactions on Industry Applications, 2015Changes of behavior of earthing systems under high impulse conditions from its steady-state conditions have been found to occur in many studies. There are many factors that are thought to cause these changes. However, little studies so far have been conducted on the effects of earth electrode dimensions and configurations, particularly at field sites ...
Mohamed Shahriman Mohamed Yunus +3 more
openaire +1 more source
Journal of Electronics and Advanced Electrical Engineering, 2021
An algorithm is proposed in this paper for calculating the impulse earthing resistances of vertical earthing electrodes. The proposed algorithm employs the average potential method to derive the formula of the low current earthing resistance. Unlike the previous algorithm, the soil ionization effect under high impulse current is taken into account by ...
Yongzheng Zhang, Xiaoqing Zhang
openaire +1 more source
An algorithm is proposed in this paper for calculating the impulse earthing resistances of vertical earthing electrodes. The proposed algorithm employs the average potential method to derive the formula of the low current earthing resistance. Unlike the previous algorithm, the soil ionization effect under high impulse current is taken into account by ...
Yongzheng Zhang, Xiaoqing Zhang
openaire +1 more source
2011 7th Asia-Pacific International Conference on Lightning, 2011
The ability of a horizontal earth electrode in reducing earth potential rise is limited because, beyond a certain length known as the effective length, no further reduction is obtained. In this paper, field experiments and computer simulations of a horizontal earth electrode is presented.
A. Elmghairbi +4 more
openaire +1 more source
The ability of a horizontal earth electrode in reducing earth potential rise is limited because, beyond a certain length known as the effective length, no further reduction is obtained. In this paper, field experiments and computer simulations of a horizontal earth electrode is presented.
A. Elmghairbi +4 more
openaire +1 more source
Grounding/earthing electrode studies. 2
Proceedings of Industrial and Commercial Power Systems Conference, 2002The paper details the effort to determine the adequacy of various methods of grounding/earthing electrodes installed in the alkaline, highly mineralized soil of the Las Vegas, Nevada area The grounding electrode testing program outlined has been prepared to address a number of questions relating to grounding [earthing] electrodes and soil conditions in
R.S. Howard, D.W. Zipse
openaire +1 more source
Potential Distribution About an Electrode on the Surface of the Earth
Physics, 1933An analytical study is made of the potential distribution about an electrode on a stratified earth, from the point of view of developing special formulas appropriate for computation at small and large distances from the electrode. Power series in the distance for small distances and simple asymptotic expansions for large separations are derived first ...
openaire +1 more source
Earth resistance of various forms of electrodes
Proceedings of the Institution of Electrical Engineers, 1969In a recent paper, Datta et al. have shown that a very simple method for finding the earth resistance of driven-rod electrodes can be used on the assumption that the equipotentials round the electrode conform to the shape of the electrode itself. In this paper, the method has been extended to various forms of electrode usually employed in practice ...
V.P. Gupta, R.L. Garg
openaire +1 more source
Nickel–rare earth electrodes for sodium borohydride electrooxidation
Electrochimica Acta, 2016Binary alloys of nickel (Ni) and dysprosium (Dy) or samarium (Sm) of different composition were prepared. Their electrocatalytic activity in respect to borohydride oxidation in alkaline medium was investigated by cyclic voltammetry, chronoamperometry and chronopotentiometry. It was correlated to their morphological and structural properties examined by
Santos, DMF +6 more
openaire +2 more sources