Modeling and analysis of digital steady current circuit of transmitter for borehole-ground electrical potential measurement system

2012 ◽  
Author(s):  
Liu Lixuan ◽  
Guo Yinhui ◽  
Liang Huaqing ◽  
Liang Zhishan ◽  
Liu Yin
Keyword(s):  
Measurement System ◽  
Electrical Potential ◽  
Potential Measurement ◽  
Modeling And Analysis ◽  
Steady Current

Reducing Hydrogen Penetration through Corrosion Layer Formed on Zirconium Alloys by Iron Addition

2006 ◽  
Vol 45 ◽  
pp. 1980-1985
Author(s):  
Kazuo Kakiuchi ◽  
Kazutoshi Okubo ◽  
Noboru Itagaki ◽  
Akihiro Miyazaki ◽  
Yoshiaki Ishii ◽  
...  
Keyword(s):  
Hydrogen Absorption ◽  
Electrical Potential ◽  
Potential Gradient ◽  
Zirconium Alloys ◽  
Corrosion Layer ◽  
Potential Measurement ◽  
Irradiation Experiment ◽  
Hydrogen Pickup ◽  
Hydrogen Penetration ◽  
Iron Addition

Latest post-irradiation experiment results of Zry-2 and HiFi alloy (0.4%Fe-Zry2) showed that iron addition reduces the hydrogen pickup by these alloys compared to oxidation amount. In order to clarify the mechanism of reduced hydrogen absorption rate, (1) autoclave test, (2) surface potential measurement and (3) hydrogen absorption test of the intermetallic compound were carried out. Based on these results, a tentative mechanism for hydrogen absorption by zirconium alloys is proposed, taking into account of both the electrical potential gradient over the oxide film as well as the SPP window for hydrogen absorption.

A Low-Cost Automated Streaming Potential Measurement System

2012 ◽  
Vol 17 (2) ◽  
pp. 125-133 ◽  
Author(s):  
Ross A. Smith ◽  
William H. Fissell ◽  
Aaron J. Fleischman ◽  
Christian A. Zorman
Keyword(s):  
Measurement System ◽  
Low Cost ◽  
Streaming Potential ◽  
Potential Measurement

scholarly journals Influence of Monodisperse Fe3O4Nanoparticle Size on Electrical Properties of Vegetable Oil-Based Nanofluids

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Bin Du ◽  
Jian Li ◽  
Feipeng Wang ◽  
Wei Yao ◽  
Shuhan Yao
Keyword(s):  
Vegetable Oil ◽  
Breakdown Strength ◽  
Electrical Breakdown ◽  
Electrical Potential ◽  
Volume Resistivity ◽  
Dielectric Strength ◽  
Potential Measurement ◽  
Dielectric Characteristics ◽  
Space Charge Distribution ◽  
Electrical Breakdown Strength

Insulating oil modified by nanoparticles (often called nanofluids) has recently drawn considerable attention, especially concerning the improvement of electrical breakdown and thermal conductivity of the nanofluids. In this paper, three sized monodisperse Fe3O4nanoparticles were prepared and subsequently dispersed into insulating vegetable oil to achieve nanofluids. The dispersion stability of nanoparticles in nanofluids was examined by natural sedimentation and zeta potential measurement. The electrical breakdown strength, space charge distribution, and several dielectric characteristics, for example, permittivity, dielectric loss, and volume resistivity of these nanofluids, were comparatively investigated. Experimental results show that the monodisperse Fe3O4nanoparticles not only enhance the dielectric strength but also uniform the electric field of the nanofluids. The depth of electrical potential well of insulating vegetable oils and nanofluids were analyzed to clarify the influence of nanoparticles on electron trapping and on insulation improvement of the vegetable oil.

Effects of lung inflation on alveolar epithelial solute and water transport properties

1982 ◽  
Vol 52 (6) ◽  
pp. 1498-1505 ◽  
Author(s):  
K. J. Kim ◽  
E. D. Crandall
Keyword(s):  
Transport Properties ◽  
Epithelial Transport ◽  
Rana Catesbeiana ◽  
Electrical Potential ◽  
Ringer Solution ◽  
Potential Measurement ◽  
Lung Inflation ◽  
Solute Permeability ◽  
Alveolar Epithelial

Paired hollow bullfrog lungs (Rana catesbeiana) were used to study the effects of lung inflation on alveolar epithelial transport of water and hydrophilic solutes. Frogs were double pithed and the lungs were removed after bronchial placement of a Lucite plug. Three openings in the plug accommodated the insertion of two agar-Ringer bridges (for electrical potential measurement and passage of direct current) and the injection and removal of alveolar bathing fluid. Ringer solution containing a tracer quantity of radioactive solute was instilled into the lung sacs (5 ml or 50 ml) and the lungs were suspended in baths of Ringer solution containng appropriate cold solutes (5 mM). Permeability properties of each solute (and water) were determined from the rate of radiotracer concentration change in the bath. The spontaneous potential difference, tissue resistance, and solute permeability properties determined in these experiments showed no significant differences between the 5- and 50-ml lungs. Assuming homogeneous, cylindrical water-filled pores to be present in the tissue, the equivalent pore radii estimated from the rates of solute and water fluxes were 1.1 (for 5-ml lungs) and 0.9 nm (for 50-ml lungs). After overinflation of the lung (to greater than 80 ml), experiments at 50 ml yielded a pore radius of 3.4 nm. These data suggest that passive alveolar epithelial transport properties do not change with degrees of lung inflation normally encountered in vivo but that overinflation can lead to increased leakiness of the barrier.

Oscillating streaming potential measurement system for macroscopic surfaces

2008 ◽  
Vol 79 (11) ◽  
pp. 113902 ◽  
Author(s):  
Martin Reischl ◽  
Stefan Köstler ◽  
Gerhard Kellner ◽  
Karin Stana-Kleinschek ◽  
Volker Ribitsch
Keyword(s):  
Measurement System ◽  
Streaming Potential ◽  
Potential Measurement
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