Direct current field induced asymmetrical DC-resistivity degradation in SrTiO3-based grain boundary layer ceramic

2019 ◽  
Vol 45 (10) ◽  
pp. 13546-13550 ◽  
Author(s):  
Fan He ◽  
Ming Lv ◽  
Minghui Lu ◽  
Lin Cao ◽  
Qingran Wang ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Grain Boundary ◽  
Direct Current ◽  
Dc Resistivity ◽  
Current Field

scholarly journals Pixels and their neighbors: Finite volume

2016 ◽  
Vol 35 (8) ◽  
pp. 703-706 ◽  
Author(s):  
Rowan Cockett ◽  
Lindsey J. Heagy ◽  
Douglas W. Oldenburg
Keyword(s):  
Finite Element ◽  
Finite Difference ◽  
Finite Volume Method ◽  
Finite Volume ◽  
Direct Current ◽  
Numerical Results ◽  
Dc Resistivity ◽  
Matrix Representations ◽  
Volume Method

We take you on the journey from continuous equations to their discrete matrix representations using the finite-volume method for the direct current (DC) resistivity problem. These techniques are widely applicable across geophysical simulation types and have their parallels in finite element and finite difference. We show derivations visually, as you would on a whiteboard, and have provided an accompanying notebook at http://github.com/seg to explore the numerical results using SimPEG ( Cockett et al., 2015 ).

scholarly journals Pulsed direct current field-induced thermal stability and phase transformation of nanodiamonds to carbon onions

RSC Advances ◽  
2019 ◽  
Vol 9 (25) ◽  
pp. 14360-14371 ◽  
Author(s):  
Faming Zhang ◽  
Kuowei Fan ◽  
Jin Yu ◽  
Farhad Saba ◽  
Jing Sun
Keyword(s):  
Thermal Stability ◽  
Phase Transformation ◽  
Direct Current ◽  
Current Field ◽  
Detailed Understanding ◽  
Pulsed Dc ◽  
Carbon Onions ◽  
Pulsed Direct Current ◽  
Thermal Stability Of

The pulsed DC field-induced thermal stability of nanodiamonds (NDs) and their transformation to carbon onions lack detailed understanding.

scholarly journals Efficient Probabilistic Joint Inversion of Direct Current Resistivity and Small-Loop Electromagnetic Data

Algorithms ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 144
Author(s):  
Christin Bobe ◽  
Daan Hanssens ◽  
Thomas Hermans ◽  
Ellen Van De Vijver
Keyword(s):  
Direct Current ◽  
Field Data ◽  
Joint Inversion ◽  
Dc Resistivity ◽  
Data Sets ◽  
Electrical Conductivities ◽  
Posterior Probability Density ◽  
Posterior Probability Density Function ◽  
Efficient Alternative ◽  
Synthetic Studies

Often, multiple geophysical measurements are sensitive to the same subsurface parameters. In this case, joint inversions are mostly preferred over two (or more) separate inversions of the geophysical data sets due to the expected reduction of the non-uniqueness in the joint inverse solution. This reduction can be quantified using Bayesian inversions. However, standard Markov chain Monte Carlo (MCMC) approaches are computationally expensive for most geophysical inverse problems. We present the Kalman ensemble generator (KEG) method as an efficient alternative to the standard MCMC inversion approaches. As proof of concept, we provide two synthetic studies of joint inversion of frequency domain electromagnetic (FDEM) and direct current (DC) resistivity data for a parameter model with vertical variation in electrical conductivity. For both studies, joint results show a considerable improvement for the joint framework over the separate inversions. This improvement consists of (1) an uncertainty reduction in the posterior probability density function and (2) an ensemble mean that is closer to the synthetic true electrical conductivities. Finally, we apply the KEG joint inversion to FDEM and DC resistivity field data. Joint field data inversions improve in the same way seen for the synthetic studies.

Low Temperature Densification of ZnO-Based Ceramic Using Phenolic Resin as Binder

2014 ◽  
Vol 668-669 ◽  
pp. 35-38
Author(s):  
Hui Zeng ◽  
Jing Jing Xie ◽  
Hai Tao Liu ◽  
Zheng Yi Fu
Keyword(s):  
Mechanical Properties ◽  
Boundary Layer ◽  
Low Temperature ◽  
Grain Boundary ◽  
Phenolic Resin ◽  
Bending Strength ◽  
Effect Of Temperature ◽  
Microstructure And Mechanical Properties

ZnO-based ceramic was densified at low temperature by using PSP as binder. The results showed that phenolic resin filled in the ZnO grain boundary layer. The sample has a well hardness of 0.8 GPa and bending strength of 78 MPa. The effect of temperature on the microstructure and mechanical properties was also investigated. It was found that the samples sintered at 300 °C showed higher density and better mechanical properties.

scholarly journals Direct current (DC) resistivity and induced polarization (IP) monitoring of active layer dynamics at high temporal resolution

2015 ◽  
Vol 119 ◽  
pp. 16-28 ◽  
Author(s):  
Joseph Doetsch ◽  
Thomas Ingeman-Nielsen ◽  
Anders V. Christiansen ◽  
Gianluca Fiandaca ◽  
Esben Auken ◽  
...  
Keyword(s):  
Active Layer ◽  
Temporal Resolution ◽  
Direct Current ◽  
Induced Polarization ◽  
High Temporal Resolution ◽  
Dc Resistivity
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