Gotowe bibliografie tematyczne / Electrical anisotropy

Gotowa bibliografia na temat „Electrical anisotropy”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 20 lutego 2023

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Artykuły w czasopismach na temat "Electrical anisotropy"

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Liu, Yajun, Pritam Yogeshwar, Xiangyun Hu, Ronghua Peng, Bülent Tezkan, Wiebke Mörbe i Jianhui Li. "Effects of electrical anisotropy on long-offset transient electromagnetic data". Geophysical Journal International 222, nr 2 (2.05.2020): 1074–89. http://dx.doi.org/10.1093/gji/ggaa213.

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SUMMARY Electrical anisotropy of formations has been long recognized by field and laboratory evidence. However, most interpretations of long-offset transient electromagnetic (LOTEM) data are based on the assumption of an electrical isotropic earth. Neglecting electrical anisotropy of formations may cause severe misleading interpretations in regions with strong electrical anisotropy. During a large scale LOTEM survey in a former mining area in Eastern Germany, data was acquired over black shale formations. These black shales are expected to produce a pronounced bulk anisotropy. Here, we investigate the effects of electrical anisotropy on LOTEM responses through numerical simulation using a finite-volume time-domain (FVTD) algorithm. On the basis of isotropic models obtained from LOTEM field data, various anisotropic models are developed and analysed. Numerical results demonstrate that the presence of electrical anisotropy has a significant influence on LOTEM responses. Based on the numerical modelling results, an isolated deep conductive anomaly presented in the 2-D isotropic LOTEM electric field data inversion result is identified as a possible artifact introduced by using an isotropic inversion scheme. Trial-and-error forward modelling of the LOTEM electric field data using an anisotropic conductivity model can explain the data and results in a reasonable quantitative data fit. The derived anisotropic 2-D model is consistent with the prior geological information.
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Luo, Tianya, Xiangyun Hu, Longwei Chen i Guilin Xu. "Investigating the Magnetotelluric Responses in Electrical Anisotropic Media". Remote Sensing 14, nr 10 (11.05.2022): 2328. http://dx.doi.org/10.3390/rs14102328.

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When interpreting magnetotelluric (MT) data, because of the inherent anisotropy of the earth, considering electrical anisotropy is crucial. Accordingly, using the edge-based finite element method, we calculated the responses of MT data for electrical isotropic and anisotropic models, and subsequently used the anisotropy index and polar plot to depict MT responses. High values of the anisotropy index were mainly yielded at the boundary domains of anomalous bodies for isotropy cases because the conductive differences among isotropic anomalous bodies or among anomalous bodies and background earth can be regarded as macro-anisotropy. However, they only appeared across anomalous bodies in the anisotropy cases. The anisotropy index can directly differentiate isotropy from anisotropy but exhibits difficulty in reflecting the azimuth of the principal conductivities. For the isotropy cases, polar plots are approximately circular and become curves with a big ratio of the major axis to minor axis, such as an 8-shaped curve for the anisotropic earth. Furthermore, the polar plot can reveal the directions of principal conductivities. However, distorted by anomalous bodies, polar plots with a large ratio of the major axis to minor axis occur in isotropic domains around the anomalous bodies, which may lead to the misinterpretation of these domains as anisotropic earth. Therefore, combining the anisotropy index with a polar plot facilitates the identification of the electrical anisotropy.
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Pillai, Pramod P., Krzysztof Pacławski, Jiwon Kim i Bartosz A. Grzybowski. "Nanostructural Anisotropy Underlies Anisotropic Electrical Bistability". Advanced Materials 25, nr 11 (20.01.2013): 1623–28. http://dx.doi.org/10.1002/adma.201202915.

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Lee, Joonsung, Yizhuang Song, Narae Choi, Sungmin Cho, Jin Keun Seo i Dong-Hyun Kim. "Noninvasive Measurement of Conductivity Anisotropy at Larmor Frequency Using MRI". Computational and Mathematical Methods in Medicine 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/421619.

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Anisotropic electrical properties can be found in biological tissues such as muscles and nerves. Conductivity tensor is a simplified model to express the effective electrical anisotropic information and depends on the imaging resolution. The determination of the conductivity tensor should be based on Ohm's law. In other words, the measurement of partial information of current density and the electric fields should be made. Since the direct measurements of the electric field and the current density are difficult, we use MRI to measure their partial information such as B1 map; it measures circulating current density and circulating electric field. In this work, the ratio of the two circulating fields, termed circulating admittivity, is proposed as measures of the conductivity anisotropy at Larmor frequency. Given eigenvectors of the conductivity tensor, quantitative measurement of the eigenvalues can be achieved from circulating admittivity for special tissue models. Without eigenvectors, qualitative information of anisotropy still can be acquired from circulating admittivity. The limitation of the circulating admittivity is that at least two components of the magnetic fields should be measured to capture anisotropic information.
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Jakučionis, L., i V. Kleiza. "Electrical Anisotropy of Thin Metal Films Growing on Dielectric Substrates". Nonlinear Analysis: Modelling and Control 7, nr 2 (5.12.2002): 45–52. http://dx.doi.org/10.15388/na.2002.7.2.15193.

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Electrical properties of conductive thin films, that are produced by vacuum evaporation on the dielectric substrates, and which properties depend on their thickness, usually are anisotropic i.e. they have uniaxial anisotropy. If the condensate grow on dielectric substrates on which plane electrical field E is created the transverse voltage U⊥ appears on the boundary of the film in the direction perpendicular to E. Transverse voltage U⊥ depends on the angle γ between the applied magnetic field H and axis of light magnetisation. When electric field E is applied to continuous or grid layers, U⊥ and resistance R of layers are changed by changing γ. It means that value of U⊥ is the measure of anisotropy magnitude. Increasing voltage U0 , which is created by E, U⊥ increases to certain magnitude and later decreases. The anisotropy of continuous thin layers is excited by inequality of conductivity tensor components σ0 ≠ σ⊥. The reason of anisotropy is explained by the model which shows that properties of grain boundaries are defined by unequal probability of transient of charge carrier.
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Krizsky, Vladimir N., Pavel N. Aleksandrov, Alexey A. Kovalskii i Sergey V. Viktorov. "Mathematical modeling of cathodic protection of electric fields for major pipelines in anisotropic terrains". SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION 10, nr 1 (29.02.2020): 52–63. http://dx.doi.org/10.28999/2541-9595-2020-10-1-52-63.

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The authors consider the problem of the computational investigation of cathodic protection electric fields measured for an underground pipeline taking into account the anisotropic nature of soil specific electrical conductivity. A computational experimental method was used to compare the figures for anisotropic soils against the current distribution for a homogeneous half-space; the influence of anisotropy factors and the azimuth conductivity tensor rotation angle for pipeline-enclosing soil on the electrical parameters of cathodic protection of the pipeline were investigated. It was demonstrated that protective capacity can vary significantly for areas close to the drainage points of cathode stations and for defective segments. It was concluded that there is a need to take into account terrain structure (its electrical anisotropy) when there are prerequisites of soil lamination/fracturing, or if its specific electrical conductivity contrast in the lateral direction is in excess of 2–2.5 times.
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Pillai, Pramod P., Krzysztof Pacławski, Jiwon Kim i Bartosz A. Grzybowski. "Correction: Nanostructural Anisotropy Underlies Anisotropic Electrical Bistability". Advanced Materials 25, nr 16 (18.04.2013): 2257. http://dx.doi.org/10.1002/adma.201390003.

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Linde, Niklas, i Laust B. Pedersen. "Evidence of electrical anisotropy in limestone formations using the RMT technique". GEOPHYSICS 69, nr 4 (lipiec 2004): 909–16. http://dx.doi.org/10.1190/1.1778234.

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Azimuthal resistivity surveys are often applied to complement hydrological information or to improve the location of observation boreholes in pump tests. Symmetric electrode configurations cannot distinguish anisotropy from lateral changes or dipping layers, but asymmetric arrays (e.g., the offset Wenner array) can. Tensor radiomagnetotellurics (RMT) is presented as an alternative method in studies of electrical anisotropy in the shallow subsurface. The electromagnetic and geomagnetic transfer functions provide information about the dimensionality of the data. These transfer functions can also be used to find the directions of anisotropy. Data with an anisotropic signature can be inverted for a one‐dimensional (1D) azimuthal anisotropy model. The method is faster than the azimuthal resistivity method. A 380‐m‐long profile of tensor RMT data (12.7–243 kHz) from limestones that overlie shale on the island of Gotland, Sweden, is used to show the merits of the method. The data have a clear anisotropic signature. The data are inverted for a three‐layer 1D model with azimuthal anisotropy using two different approaches: (1) a moving median filter of five neighboring stations and neglecting static shift parameters; and (2) treating each station separately and including static shifts of the electric field in the inversion. Both inversions show models having a marked anisotropy with anisotropy factors of 3.7 and 4.5, respectively, in the limestones. The second approach has a significantly better data fit. However, the first approach is preferred because the models are smoother from station to station.
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Bachrach, Ran. "Elastic and resistivity anisotropy of shale during compaction and diagenesis: Joint effective medium modeling and field observations". GEOPHYSICS 76, nr 6 (1.11.2011): E175—E186. http://dx.doi.org/10.1190/geo2010-0381.1.

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Shales are anisotropic materials which have been observed to have both electrical and elastic anisotropy. Shales also comprise most of the sedimentary column in clastic basins, and thus, the ability to model shale response to electrical and seismic fields may improve our ability to better resolve anisotropy by using different measurements. Compacting shale-effective media modeling, which captures the geological process of porosity reduction and geochemical compaction, was formulated in this research in microstructural parameters associated with particle alignment and pore-shape deformation. The state of compaction, captured by the porosity of the soft sediment, governs the pore aspect ratio and the amount of particle alignment. Diagenetic processes are captured using temperature-dependent mineral elasticity and conductivity. The model uses the same microstructural parameters and equivalent effective medium approximation scheme to predict electrical and elastic anisotropy. In situ measurements of electrical anisotropy and seismic based estimates of elastic anisotropy in shales in the same basin compare favorably with modeling results. The joint-modeling formulation provides ways to study electrical resistivity and elastic-anisotropy jointly and explore the use of electrical resistivity anisotropy measurements to constrain elastic anisotropy, and vice versa.
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Kong, Wenxin, Changhong Lin, Handong Tan, Miao Peng, Tuo Tong i Mao Wang. "The Effects of 3D Electrical Anisotropy on Magnetotelluric Responses: Synthetic Case Studies". Journal of Environmental and Engineering Geophysics 23, nr 1 (marzec 2018): 61–75. http://dx.doi.org/10.2113/jeeg23.1.61.

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Using the staggered-grid finite difference method, a numerical modeling algorithm for a 3D arbitrary anisotropic Earth is implemented based on magnetotelluric (MT) theory. After the validation of this algorithm and comparison with predecessors, it was applied to several qualitative and quantitative analyses containing electrical anisotropy and a simple 3D prism model. It was found that anisotropic parameters for ρ 1 , ρ 2 , and ρ 3 play almost the same role in affecting 3D MT responses as in 1D and 2D without considering three Euler's angles α S , α D , and α L . Significant differences appear between the off-diagonal components of the apparent resistivity tensor and also between the diagonal components in their values and distributing features under the influence of 3D anisotropy, which in turn help to identify whether the MT data are generated from 3D anisotropic earth. Considering the deflecting effects arising from the inconsistency between the anisotropy axes and the measuring axes, some strategies are also provided to estimate the deflecting angles associated with anisotropy strike α S or dip α D , which may be used as initial values for the 3D anisotropy inversion. [Figure: see text]
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Rozprawy doktorskie na temat "Electrical anisotropy"

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Okazaki, Tomohisa. "Characteristics of Electrical Anisotropy in Magnetotelluric Responses". Kyoto University, 2018. http://hdl.handle.net/2433/232256.

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Somkun, Sakda. "Magnetostriction and magnetic anisotropy in non-oriented electrical steels and stator core laminations". Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/55184/.

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Magnetostriction is a source of vibration and acoustic noise of electrical machines and it can be highly anisotropic even in non-oriented electrical steel. Understanding of magnetostriction under magnetisation and stress conditions present in stator core laminations can help predict the core vibration and radiated noise. Anisotropy of magnetostriction of a 0.50 mm thick non-oriented steel investigated in Epstein strips cut at angles to the rolling direction was much higher than the anisotropy of its magnetic and elastic properties because magnetostriction arises directly from magnetic domain processes. Magnetostriction of a disc sample of the 0.50 mm thick steel was measured under ID and 2D magnetisation and compared with that of a 0.35 mm thick steel with different anisotropy level. A 2D magnetostriction model and an analytical simple domain model were used to explain the experimental results. 2D magnetostriction is dependent on the magnetostrictive anisotropy and the ratios of the transverse to longitudinal magnetostriction. AC magnetostriction measured in the disc samples was larger than in the Epstein strips due to the form effect. An induction motor model core was constructed from the 0.50 mm thick steel for measurements of localised flux density and deformation. Core deformation due to Maxwell forces was calculated. Magnetostriction and specific power loss of the core material under magnetisation conditions present in the core was measured. The localised loss in the stator teeth, tooth roots and back iron differed from their average value by 52%, 19% and 36% due to the magnetic anisotropy. Magnetostriction was estimated to be about 55% and 80% of the radial deformation at the tooth root and back iron regions respectively. Stator teeth deformed asymmetrically and the magnitude of the space harmonics increased due to the magnetostrictive anisotropy. The measurement results inferred that 2D magnetostriction can be predicted from the magnetostrictive anisotropy and vice versa. Also, core deformation and vibration of large machines, where segmented stator core laminations are used, can be estimated analytically with the knowledge of 2D magnetostriction of the core material.
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Varshney, Kush R. (Kush Raj). "Joint anisotropy characterization and image formation in wide-angle synthetic aperture radar". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37852.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 145-151).
Imagery formed from wide-angle synthetic aperture radar (SAR) measurements has fine cross-range resolution in principle. However, conventional SAR image formation techniques assume isotropic scattering, which is not valid with wide-angle apertures. Also, the spatial location of scattering centers may migrate as a function of viewing angle across the aperture. The problem of jointly forming images and characterizing anisotropy as well as characterizing scattering center migration in wide-angle SAR is considered in the thesis. The approach not only compensates for anisotropy and migration in the image formation process, but gives much more information, useful for scene interpretation, than a simple image would. A method based on a sparse representation of anisotropic scattering with an over-complete basis composed of basis vectors with varying levels of angular persistence is presented. Solved as an inverse problem, the result is a complex-valued, aspect-dependent response for each scatterer in a scene. The non-parametric approach jointly considers all scatterers within one system of equations.
(cont.) The choice of the overcomplete basis set incorporates prior knowledge of anisotropy, but the method is flexible enough to admit solutions that may not match a family of parametric functions. Sparsity is enforced through regularization based on the lp quasi-norm, p < 1, leading to a non-convex minimization problem. A quasi-Newton method is applied to the problem and a novel greedy graph-structured algorithm is developed and also applied. Results are demonstrated on synthetic examples and realistic examples with XPatch data, including the backhoe public release dataset.
by Kush R. Varshney.
S.M.
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Paridis, Kyriakos Costas. "The inverse conductivity problem : anisotropy, finite elements and resistor networks". Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/the-inverse-conductivity-problem-anisotropy-finite-elements-and-resistor-networks(db58b164-9b6e-45f3-b4b9-4f5935c40e48).html.

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EIT is a method of imaging that exists for a century, initially in geophysics and in recent years in medical imaging. Even though the practical applications of EIT go back to the early 20th century the systematic study of the inverse conductivity problem started in the late 1970s, hence many aspects of the problem remain unexplored. In the study of the inverse conductivity problem usually Finite Element Models are used since they can be easily adapted for bodies of irregular shapes. In this work though we use an equivalent approximation, the electrical resistor network, for which many uniqueness results as well as reconstruction algorithms exist. Furthermore resistor networks are important for EIT since they are used to provide convenient stable test loads or phantoms for EIT systems. In this thesis we study the transfer resistance matrix of a resistor network that is derived from n-port theory and review necessary and sufficient conditions for a matrix to be the transfer resistance of a planar network. The so called “paramountcy” condition may be useful for validation purposes since it provides the means to locate problematic electrodes. In the study of resistor networks in relation to inverse problems it is of a great importance to know which resistor networks correspond to some Finite Element Model. To give a partial answer to this we use the dual graph of a resistor network and we represent the voltage by the logarithm of the circle radius. This representation in combination with Duffin’s non-linear resistor network theory provides the means to show that a non-linear resistor network can be embedded uniquely in a Euclidean space under certain conditions. This is where the novelty of this work lies.
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Yeboah-Forson, Albert. "Hydrogeophysical Characterization of Anisotropy in the Biscayne Aquifer Using Geophysical Methods". FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/919.

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The anisotropy of the Biscayne Aquifer which serves as the source of potable water for Miami-Dade County was investigated by applying geophysical methods. Electrical resistivity imaging, self potential and ground penetration radar techniques were employed in both regional and site specific studies. In the regional study, electrical anisotropy and resistivity variation with depth were investigated with azimuthal square array measurements at 13 sites. The observed coefficient of electrical anisotropy ranged from 1.01 to 1.36. The general direction of measured anisotropy is uniform for most sites and trends W-E or SE-NW irrespective of depth. Measured electrical properties were used to estimate anisotropic component of the secondary porosity and hydraulic anisotropy which ranged from 1 to 11% and 1.18 to 2.83 respectively. 1-D sounding analysis was used to models the variation of formation resistivity with depth. Resistivities decreased from NW (close to the margins of the everglades) to SE on the shores of Biscayne Bay. Porosity calculated from Archie's law, ranged from 18 to 61% with higher values found along the ridge. Higher anisotropy, porosities and hydraulic conductivities were on the Atlantic Coastal Ridge and lower values at low lying areas west of the ridge. The cause of higher anisotropy and porosity is attributed to higher dissolution rates of the oolitic facies of the Miami Formation composing the ridge. The direction of minimum resistivity from this study is similar to the predevelopment groundwater flow direction indicated in published modeling studies. Detailed investigations were carried out to evaluate higher anisotropy at West Perrine Park located on the ridge and Snapper Creek Municipal well field where the anisotropy trend changes with depth. The higher anisotropy is attributed to the presence of solution cavities oriented in the E-SE direction on the ridge. Similarly, the change in hydraulic anisotropy at the well field might be related to solution cavities, the surface canal and groundwater extraction wells.
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Almenara, Cueto Carlos Ignacio. "Anisotropy and humidity effect on tensile properties and electrical volume resistivity of fused deposition modeled acrylonitrile butadiene styrene composites". Master's thesis, Pontificia Universidad Católica del Perú, 2017. http://tesis.pucp.edu.pe/repositorio/handle/123456789/9319.

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En la presente tesis, se estudió la influencia de la anisotropía y la humedad en las propiedades mecánicas a la tracción y la resistividad volumétrica de los compuestos de Acrilonitrilo Butadieno Estireno reforzado con Nano Tubos de Carbono y Acrilonitrilo Butadieno Estireno reforzado con Micro Fibras de Carbono impresos en 3D de por Deposición de Material Fundido. Para estudiar la influencia de la anisotropía, tres diferentes orientaciones de impresión de capa fueron comparadas (0°, 45° and 45°/-45°) esto para una altura de capa de 0.2 mm. Se concluyó que la influencia de la anisotropía es importante para el comportamiento mecánico de el Acrilonitrilo Butadieno Estireno con Micro Fibras de Carbono esto debido a la relación que existe entre la resistencia que realiza el refuerzo y el alineamiento que presentan las fibras respecto a la dirección de tracción. Por otro lado, no se encontraron mayor influencia de la anisotropía en las propiedades mecánicas del Acrilonitrilo Butadieno Estireno con Nano Tubos de Carbono. En la resistividad volumétrica para el Acrilonitrilo Butadieno Estireno con Nano Tubos de Carbono no se encontró mayor variación en los resultados debido a la anisotropía de las capas. El Acrilonitrilo Butadieno Estireno con Micro Fibras de Carbono no pudo ser ensayado debido a la alta resistividad que el material presentó. Para estudiar la influencia de la humedad, dos condiciones del filamento se compararon: seco y expuesto a la humedad. Se concluyó que la influencia de la humedad en el filamento es también importante en el comportamiento mecánico a la tracción del Acrilonitrilo Butadieno Estireno con Micro Fibras de Carbono esto debido a que la humedad absorbida por el filamento se elimina a través de burbujas de vapor que explosionan durante la impresión 3D empobreciendo así la adherencia entre la fibra y la matriz polimérica. Por otro lado, no se encontró tampoco mayor influencia en el comportamiento mecánico a la tracción del Acrilonitrilo Butadieno Estireno reforzado con Nano Tubos de Carbono debido a la humedad. En la resistividad volumétrica, se encontró que la humedad influye más en los resultados que la anisotropía, pero no llega a ser una influencia considerable. Esta influencia se debe principalmente a estructura menos uniforme que presenta el sólido impreso debido a las alteraciones producto de las explosiones de burbujas de vapor para eliminar la humedad absorbida como se mencionó anteriormente.
In the present thesis, the influence of anisotropy and humidity in the tensile properties and electrical volume resistivity of Acrylonitrile Butadiene Styrene/Carbon Nanotubes and Acrylonitrile Butadiene Styrene/Micro Carbon Fibers manufactured by Fused Deposition Modeling 3D printing was studied. To study the influence of the anisotropy three different layer printing orientations were compared (0°, 45° and 45°/-45°) in a layer height of 0.2 mm. It was concluded that the influence of anisotropy is important on Acrylonitrile Butadiene Styrene/Micro Carbon Fibers tensile behavior due to relation that exist between the performance/resistance and the alignment of the reinforcement. On the other hand, no significant influence was found on the Acrylonitrile Butadiene Styrene/Carbon Nanotubes. On the electrical volume resistivity, no significant variation was found on the Acrylonitrile Butadiene Styrene/Carbon Nanotubes by the anisotropy of the layers. Acrylonitrile Butadiene Styrene/Micro Carbon Fibers could not be essayed because of the high resistance of the composite. To study the influence of the humidity, two conditions on the filaments of the materials in study were compared: dry and moisture exposed. It was concluded that the influence of humidity is also remarkable on Acrylonitrile Butadiene Styrene/Micro Carbon Fibers tensile behavior because the humidity absorbed by the filaments is removed through vapor bubble blast during the 3D printing that impoverishes the adherence between the fibers and the matrix. On the other hand, no significant influence was again found on the Acrylonitrile Butadiene Styrene/Carbon Nanotubes. On the electrical volume resistivity, the humidity influences more this attributed to the less uniform structure the specimens printed with moisture exposed filaments have because of the steam explosions mentioned before.
In der vorliegenden Arbeit wurde der Einfluss von Anisotropie und Feuchtigkeit in den Zugeigenschaften und dem elektrischen Volumenwiderstand von Acrylnitril- Butadien-Styrol/Kohlenstoffnanoröhren und Acrylnitril-Butadien-Styrol/Mikro Kohlefaser, hergestellt durch Schmelzschichtung Modellieren 3D-Druck, untersucht. Um den Einfluss der Anisotropie zu untersuchen, wurden drei unterschiedliche Schichtdruckorientierungen (0 °, 45 ° und 45 ° / -45 °) in einer Schichthöhe von 0,2 mm verglichen. Es wurde festgestellt, dass der Einfluss der Anisotropie bei Acrylnitril-Butadien-Styrol/Mikro Kohlefaser zugverhalten aufgrund der Beziehung zwischen der Leistung / dem Widerstand und der Ausrichtung der Bewehrung wichtig ist. Auf der anderen Seite wurde kein signifikanter Einfluss auf die Acrylnitril- Butadien-Styrol/Kohlenstoffnanoröhren gefunden. Bei dem elektrischen Volumenwiderstand wurde keine signifikante Variation auf der Acrylnitril-Butadien-Styrol/Kohlenstoffnanoröhren durch die Anisotropie der Schichten gefunden. Acrylnitril-Butadien-Styrol/Mikro Kohlefaser konnte wegen der hohen Beständigkeit des Verbundwerkstoffes nicht aufgeschrieben werden. Um den Einfluss der Feuchtigkeit zu untersuchen, wurden zwei Bedingungen auf den Filamenten der Materialien in der Studie verglichen: trocken und Feuchtigkeit ausgesetzt. Es wurde festgestellt, dass der Einfluss der Feuchtigkeit auch bei Acrylnitril-Butadien-Styrol/Mikro Kohlefaser-Zugverhalten bemerkenswert ist, da die von den Filamenten absorbierte Feuchtigkeit durch Dampfblasenblasen während des 3D-Druckens entfernt wird, was die Haftung zwischen den Fasern und der Matrix verarmt. Auf der anderen Seite wurde auf der Acrylnitril-Butadien- Styrol/Kohlenstoffnanoröhren kein signifikanter Einfluss gefunden. Bei dem elektrischen Volumenwiderstand beeinflusst die Feuchtigkeit mehr, was auf die weniger einheitliche Struktur zurückzuführen ist. Die mit feuchtigkeitsbelichteten Filamenten bedruckten Proben haben wegen der zuvor erwähnten Dampfexplosionen.
Tesis
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Wilson, Glenn Andrew, i glenn wilson@griffith edu au. "Plane Wave Propagation Problems in Electrically Anisotropic and Inhomogeneous Media with Geophysical Applications". Griffith University. School of Microelectronic Engineering, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20030325.210206.

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Boundary value problems required for modelling plane wave propagation in electrically anisotropic and inhomogeneous media relevant to the surface impedance methods in electromagnetic geophysics are formally posed and treated. For a homogeneous TM-type wave propagating in a half space with both vertical and horizontal inhomogeneities where the TM-type wave is aligned with one of the elements of the conductivity tensor, it is shown using exact solutions that the shearing term in the homogeneous Helmholtz equation for inclined anisotropic media: [Equation 1], unequivocally vanishes and solutions need only be sought to the homogeneous Helmholtz equation for biaxial media: [Equation 2]. This implies that those problems posed with an inclined uniaxial conductivity tensor can be identically stated with a fundamental biaxial conductivity tensor, provided that the conductivity values are the reciprocal of the diagonal terms from the Euler rotated resistivity tensor: [Equation 3], [Equation 4], [Equation 5]. The applications of this consequence for numerical methods of solving arbitrary two-dimensional problems for a homogeneous TM-type wave is that they need only to approximate the homogeneous Helmholtz equation and neglect the corresponding shearing term. The self-consistent impedance method, a two-dimensional finite-difference approximation based on a network analogy, is demonstrated to accurately solve for problems with inclined uniaxial anisotropy using the fundamental biaxial anisotropy equivalence. The problem of a homogeneous plane wave at skew incidence upon an inclined anisotropic half space is then formally treated. In the half space, both TM- and TE-type waves are coupled and the linearly polarised incident TM- and TE-type waves reflect TE- and TM-type components. Equations for all elements of the impedance tensor are derived for both TM- and TE-type incidence. This offers potential as a method of predicting the direction of anisotropic strike from tensor impedance measurements in sedimentary environments.
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Wilson, Glenn Andrew. "Plane Wave Propagation Problems in Electrically Anisotropic and Inhomogeneous Media with Geophysical Applications". Thesis, Griffith University, 2003. http://hdl.handle.net/10072/365776.

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Boundary value problems required for modelling plane wave propagation in electrically anisotropic and inhomogeneous media relevant to the surface impedance methods in electromagnetic geophysics are formally posed and treated. For a homogeneous TM-type wave propagating in a half space with both vertical and horizontal inhomogeneities where the TM-type wave is aligned with one of the elements of the conductivity tensor, it is shown using exact solutions that the shearing term in the homogeneous Helmholtz equation for inclined anisotropic media: [Equation 1], unequivocally vanishes and solutions need only be sought to the homogeneous Helmholtz equation for biaxial media: [Equation 2]. This implies that those problems posed with an inclined uniaxial conductivity tensor can be identically stated with a fundamental biaxial conductivity tensor, provided that the conductivity values are the reciprocal of the diagonal terms from the Euler rotated resistivity tensor: [Equation 3], [Equation 4], [Equation 5]. The applications of this consequence for numerical methods of solving arbitrary two-dimensional problems for a homogeneous TM-type wave is that they need only to approximate the homogeneous Helmholtz equation and neglect the corresponding shearing term. The self-consistent impedance method, a two-dimensional finite-difference approximation based on a network analogy, is demonstrated to accurately solve for problems with inclined uniaxial anisotropy using the fundamental biaxial anisotropy equivalence. The problem of a homogeneous plane wave at skew incidence upon an inclined anisotropic half space is then formally treated. In the half space, both TM- and TE-type waves are coupled and the linearly polarised incident TM- and TE-type waves reflect TE- and TM-type components. Equations for all elements of the impedance tensor are derived for both TM- and TE-type incidence. This offers potential as a method of predicting the direction of anisotropic strike from tensor impedance measurements in sedimentary environments.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Microelectronic Engineering
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Beres, Jan. "Caractérisation de l'anisotropie d'une plate-forme carbonatée karsifiée : approche méthodologique conjointe sismique et électrique". Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00880759.

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Les résultats présentés dans ce document portent sur les anisotropies sismique et électrique d'un massif calcaire fracturé dans des galeries parallèles souterraines. Les fractures étant orientées verticalement, leurs propriétés sont approximées par isotropie transverse horizontale (HTI). Plusieurs méthodes d'inversion ont été étudié pour traiter les données sismiques (temps d'arrivée des ondes P et S); et pour traiter les données de résistivité électrique mesuré dans une configuration pôle-pôle (valeur de potentiel mesuré).Pour traiter les données sismiques (quatre campagnes), les méthodes étudiées dans ce document sont: une tomographie isotrope, une approximation de cosinus, une inversion anisotrope basée sur l'algorithme Monte-Carlo pour les paramètres de la matrice de rigidité (de l'isotropie transverse horizontale) et une tomographie anisotrope pour un milieu avec une isotropie transverse inclinée. Toutes les méthodes conduisent à la conclusion qu'il y a effectivement une anisotropie présente dans le massif rocheux et confirment la direction de la vélocité maximale parallèle à la direction de la fracturation. Une forte anisotropie de 15 % est présente dans la zone étudiée.Pour traiter les données électriques (deux campagnes), les méthodes étudiées sont une approximation de cosinus et une inversion anisotrope basée sur l'algorithme Monte-Carlo pour les paramètres de résistivité transversale ρT, de résistivité longitudinale ρL et de l'angle d'orientation du modèle par rapport au système de référence. La présence à 180° de deux maxima de résistivité apparente par rapport à l'azimut de mesure ne peuvent être modélisés par des approches conventionnelles. Une modélisation conceptuelle d'un maillage des fils conducteurs dans un milieu non conducteur a été développé et montre des résultats prometteurs, avec le succès de la modélisation des deux maxima.Des mesures répétées montrent de légères variations de résistivité apparentes et des variations des ondes P. Les variations des ondes S ne sont pas prononcés, ce qui reflète un changement de la saturation en eau. La porosité de 10-15% est estimé à partir des mesures sismiques.
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El, Beainou Raya. "Relations structure - propriétés de conduction dans des films W-Cu nanostructurés". Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCD004/document.

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Des films minces de W et de W-Cu ont été déposés par co-pulvérisation GLAD à partir de deux cibles opposées de W et Cu. Chaque cible a été focalisée sur le centre du substrat avec un angle d'inclinaison α = 80°. Plusieurs séries d’échantillons ont été réalisées en faisant varier différents paramètres expérimentaux : la pression de travail, l’épaisseur des films ainsi que les intensités du courant des cibles. La nature des films préparés et leurs propriétés ont été étudiées pour comprendre les corrélations entre les caractéristiques structurales et les comportements électriques des films. Les paramètres expérimentaux jouent un rôle fondamental sur la forme des colonnes, leur angle de croissance, et sur la composition élémentaire des films colonnaires de W-Cu. Une variation systématique de ces paramètres a permis de relier certaines caractéristiques morphologiques et structurales aux propriétés de transport électronique dans ces films colonnaires. Le cuivre a été dissout chimiquement afin d’obtenir une structure plus poreuse, ceci dans l’objectif d’améliorer l’anisotropie électrique. Parallèlement à cette approche expérimentale, un modèle théorique a été développé pour comprendre les propriétés de conduction dans les films en tenant compte de la géométrie anisotrope des colonnes. Ce modèle a été appliqué aux films de W et W-Cu bruts et gravés
W and W-Cu thin films were deposited by the GLAD co-sputtering technique from two opposite targets: W and Cu. Each target was focused on the center of the substrate with a tilt angle of α = 80 °. Several series were prepared changing some experimental parameters: the sputtering pressure, the film’s thickness as well as the target currents. The nature of as-deposited films and their morphological properties were studied in order to understand the correlations between some structural characteristics and electrical behaviors of these structured films. The experimental parameters play a key-role on the shape of the columns, their angle of inclination, and the elemental composition of these W-Cu films. The influence of these parameters on the films morphology was demonstrated and related to the electronic transport properties in these columnar films. The copper was chemically etched in order to obtain a more porous structure, with the aim of improving the electrical anisotropy. A theoretical model was also developed in order to understand the electrical conductivity mechanism in these columnar films taking into account the anisotropic structure of the columns. This model was applied to W, as-deposited W-Cu and etched W-Cu films
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Książki na temat "Electrical anisotropy"

1

Yu, Chen-Kuo. Electromagnetic scattering of an anisotropically coated tubular cylinder. Monterey, Calif: Naval Postgraduate School, 1997.

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2

A, Serdi͡ukov, red. Electromagnetics of bi-anisotropic materials: Theory and applications. Australia: Gordon and Breach Science, 2001.

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Burton, J. D., i E. Y. Tsymbal. Magnetoresistive phenomena in nanoscale magnetic contacts. Redaktorzy A. V. Narlikar i Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.18.

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This article examines magnetoresistive phenomena in nano- and atomic-size ferromagnetic metal contacts. In particular, it considers how magnetization affects the flow of electrical current in ferromagnetic materials by focusing on two major categories of magnetoresistive phenomena: the ‘spin-valve’, where the flow of spin-polarized electrical current is affected by an inhomogeneous magnetization profile, and anisotropic magnetoresistance (AMR), which involves the anisotropy of electrical transport properties with respect to the orientation of the magnetization. The article first provides an overview of ballistic transport and conductance quantization before discussing domain-wall magnetoresistance at the nanoscale. It also describes AMR in magnetic nanocontacts as well as tunnelling anisotropic magnetoresistance in broken contacts.
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4

Launay, Jean-Pierre, i Michel Verdaguer. Electrons in Molecules. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198814597.001.0001.

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The book treats in a unified way electronic properties of molecules (magnetic, electrical, photophysical), culminating with the mastering of electrons, i.e. molecular electronics and spintronics and molecular machines. Chapter 1 recalls basic concepts. Chapter 2 describes the magnetic properties due to localized electrons. This includes phenomena such as spin cross-over, exchange interaction from dihydrogen to extended molecular magnetic systems, and magnetic anisotropy with single-molecule magnets. Chapter 3 is devoted to the electrical properties due to moving electrons. One considers first electron transfer in discrete molecular systems, in particular in mixed valence compounds. Then, extended molecular solids, in particular molecular conductors, are described by band theory. Special attention is paid to structural distortions (Peierls instability) and interelectronic repulsions in narrow-band systems. Chapter 4 treats photophysical properties, mainly electron transfer in the excited state and its applications to photodiodes, organic light emitting diodes, photovoltaic cells and water photolysis. Energy transfer is also treated. Photomagnetism (how a photonic excitation modifies magnetic properties) is introduced. Finally, Chapter 5 combines the previous knowledge for three advanced subjects: first molecular electronics in its hybrid form (molecules connected to electrodes acting as wires, diodes, memory elements, field-effect transistors) or in the quantum computation approach. Then, molecular spintronics, using, besides the charge, the spin of the electron. Finally the theme of molecular machines is presented, with the problem of the directionality control of their motion.
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5

Delgado Martín, Jordi, Andrea Muñoz-Ibáñez i Ismael Himar Falcón-Suárez. 6th International Workshop on Rock Physics: A Coruña, Spain 13 -17 June 2022: Book of Abstracts. Wyd. 2022. Servizo de Publicacións da UDC, 2022. http://dx.doi.org/10.17979/spudc.000005.

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[Abstract] The 6th International Workshop on Rock Physics (6IWRP) was held A Coruña, Spain, between 13th and 17th of June, 2022. This meeting follows the track of the five successful encounters held in Golden (USA, 2011), Southampton (UK, 2013), Perth (Australia, 2015), Trondheim (Norway, 2017) and Hong Kong (China, 2019). The aim of the workshop was to bring together experiences allowing to illustrate, discuss and exchange recent advances in the wide realm of rock physics, including theoretical developments, in situ and laboratory scale experiments as well as digital analysis. While rock physics is at the core of the oil & gas industry applications, it is also essential to enable the energy transition challenge (e.g. CO2 and H2 storage, geothermal), ensure a safe and adequate use of natural resources and develop efficient waste management strategies. The topics of 6IWRP covered a broad spectrum of rock physics-related research activities, including: • Experimental rock physics. New techniques, approaches and applications; Characterization of the static and dynamic properties of rocks and fluids; Multiphysics measurements (NMR, electrical resistivity…); Deep/crustal scale rock physics. • Modelling and multiscale applications: from the lab to the field. Numerical analysis and model development; Data science applications; Upscaling; Microseismicity and earthquakes; Subsurface stresses and tectonic deformations. • Coupled phenomena and rock properties: exploring interactions. Anisotropy; Flow and fractures; Temperature effects; Rock-fluid interaction; Fluid and pressure effects on geophysical signatures. • The energy transition challenge. Applications to energy storage (hydrogen storage in porous media), geothermal resources, energy production (gas hydrates), geological utilization and storage of CO2, nuclear waste disposal. • Rock physics templates: advances and applications. Quantitative assessment; Applications to reser voir characterization (role of seismic wave anisotropy and fracture networks). • Advanced rock physics tools. Machine learning; application of imaging (X-ray CT, X-ray μCT, FIB-SEM…) to obtain rock proper ties. This book compiles more than 50 abstracts, summarizing the works presented in the 6IWRP by rock physicists from all over the world, belonging to both academia and industry. This book means an updated overview of the rock physics research worldwide.
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6

Valenzuela, S. O., i T. Kimura. Experimental observation of the spin Hall effect using electronic nonlocal detection. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787075.003.0014.

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This chapter shows how the spin Hall effect (SHE) has been described as a source of spin-polarized electrons for electronic applications without the need for ferromagnets or optical injection. Because spin accumulation does not produce an obvious measurable electrical signal, electronic detection of the SHE proved to be elusive and was preceded by optical demonstrations. Several experimental schemes for the electronic detection of the SHE had been originally proposed, including the use of ferromagnetic electrodes to determine the spin accumulation at the edges of the sample. However, the difficulty of sample fabrication and the presence of spin-related phenomena such as anisotropic magnetoresistance or the anomalous Hall effect in the ferromagnetic electrodes could mask or even mimic the SHE signal in the sample layouts.
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7

Mosley, Connor Devyn William. Enhanced Polarisation Control and Extreme Electric Fields: Advances in Terahertz Spectroscopy Applied to Anisotropic Materials and Magnetic Phase Transitions. Springer International Publishing AG, 2021.

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Mosley, Connor Devyn William. Enhanced Polarisation Control and Extreme Electric Fields: Advances in Terahertz Spectroscopy Applied to Anisotropic Materials and Magnetic Phase Transitions. Springer International Publishing AG, 2022.

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Części książek na temat "Electrical anisotropy"

1

Santosh, R., U. Nageswara Rao, M. Jagan Mohan Rao, Suresh Kumar Yattirajula i V. Kumar. "The Anisotropy and Birefringence of Monolayer WS2 Semiconductor". W Lecture Notes in Electrical Engineering, 249–55. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2308-1_26.

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Nelatury, Sudarshan R. "Lumped Circuit Modeling at Nanoscale (Part-I: Dielectric Anisotropy)". W Lecture Notes in Electrical Engineering, 1–14. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5550-1_1.

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Benjelloun, Driss, Jean-Pierre Bonnet i Marc Onillon. "Anisotropy of Electrical Properties in Pure and Doped αFe2O3". W Transport in Nonstoichiometric Compounds, 51–60. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2519-2_5.

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Ahmed, M. T., S. Roth i M. D. Migahed. "DC Electrical Anisotropy of Stretchoriented Polyacetylene: Doping and Temperature Dependence". W Electronic Properties of Polymers, 112–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84705-9_21.

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5

Baldini, F., A. Giannetti, F. Senesi, C. Trono, L. Bolzoni i G. Porro. "An Optical Platform Based on Fluorescence Anisotropy for C Reactive Protein and Procalcitonine Assay". W Lecture Notes in Electrical Engineering, 127–31. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3606-3_22.

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Blodgett, Mark, i Peter B. Nagy. "Eddy Current Evaluation of Electrical Anisotropy in Polycrystalline Ti-6AL-4V". W Review of Progress in Quantitative Nondestructive Evaluation, 1709–16. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4791-4_219.

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Baughman, R. H., i L. W. Shacklette. "The Effects of Intrachain Defects on the Electrical Anisotropy of Conducting Polymers". W Springer Series in Solid-State Sciences, 7–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83833-0_2.

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Li, Wei, Liyun Zheng i Minggang Zhu. "High Anisotropy and High Electrical Resistivity Nd-Fe-B/CaF2Composite Magnets with Laminated Structures". W PRICM, 1705–8. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118792148.ch214.

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Li, Wei, Liyun Zheng i Minggang Zhu. "High Anisotropy and High Electrical Resistivity Nd-Fe-B/CaF2 Composite Magnets with Laminated Structures". W Proceedings of the 8th Pacific Rim International Congress on Advanced Materials and Processing, 1705–8. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-48764-9_214.

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Lee, Hunju, i Jong-Tae Park. "Effect of Cold Rolling Reduction on Recrystallization Texture and Magnetic Anisotropy of Non-Oriented Electrical Steel". W Proceedings of the 6th International Conference on Recrystallization and Grain Growth (ReX&GG 2016), 185–89. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48770-0_27.

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Streszczenia konferencji na temat "Electrical anisotropy"

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North, L. J., A. I. Best, J. Sothcott i G. Marketos. "Compaction Induced Electrical Anisotropy in Sandstones". W 75th EAGE Conference and Exhibition incorporating SPE EUROPEC 2013. Netherlands: EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20130349.

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Gonzalez, Andres, Zoya Heidari i Olivier Lopez. "Electrical, Diffusional, and Hydraulic Tortuosity Anisotropy Quantification Using 3D CT-Scan Image Data". W SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206109-ms.

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Abstract Depositional mechanisms of sediments and post-depositional process often cause spatial variation and heterogeneity in rock fabric, which can impact the directional dependency of petrophysical, electrical, and mechanical properties. Quantification of the directional dependency of the aforementioned properties is fundamental for the appropriate characterization of hydrocarbon-bearing reservoirs. Anisotropy quantification can be accomplished through numerical simulations of physical phenomena such as fluid flow, gas diffusion, and electric current conduction in porous media using multi-scale image data. Typically, the outcome of these simulations is a transport property (e.g., permeability). However, it is also possible to quantify the tortuosity of the media used as simulation domain, which is a fundamental descriptor of the microstructure of the rock. The objectives of this paper are (a) to quantify tortuosity anisotropy of porous media using multi-scale image data (i.e., whole-core CT-scan and micro-CT-scan image stacks) through simulation of electrical potential distribution, diffusion, and fluid flow, and (b) to compare electrical, diffusional, and hydraulic tortuosity. First, we pre-process the images (i.e., CT-scan images) to remove non-rock material visual elements (e.g., core barrel). Then, we perform image analysis to identify different phases in the raw images. Then, we proceed with the numerical simulations of electric potential distribution. The simulation results are utilized as inputs for a streamline algorithm and subsequent direction-dependent electrical tortuosity estimation. Next, we conduct numerical simulation of diffusion using a random walk algorithm. The distance covered by each walker in each cartesian direction is used to compute the direction-dependent diffusional tortuosity. Finally, we conduct fluid-flow simulations to obtain the velocity distribution and compute the direction-dependent hydraulic tortuosity. The simulations are conducted in the most continuous phase of the segmented whole-core CT-scan image stacks and in the segmented pore-space of the micro-CT-scan image stacks. Finally, the direction-dependent tortuosity values obtained with each technique are employed to assess the anisotropy of the evaluated samples. We tested the introduced workflow on dual energy whole-core CT-scan images and on smaller scale micro-CT-scan images. The whole-core CT-scan images were obtained from a siliciclastic depth interval, composed mainly by spiculites. Micro-CT-scan images we obtained from Berea Sandstone and Austin Chalk formations. We observed numerical differences in the estimates of direction-dependent electrical, diffusional, and hydraulic tortuosity for both types of image data employed. The highest numerical differences were observed when comparing electrical and hydraulic tortuosity with diffusional tortuosity. The observed differences were significant specially in anisotropic samples. The documented comparison provides useful insight in the selection process of techniques for estimation of tortuosity. The use of core-scale image data in the proposed workflow provides semi-continuous estimates of tortuosity and tortuosity anisotropy which is typically not attainable when using pore-scale images. Additionally, the semi-continuous nature of the tortuosity and tortuosity anisotropy estimates in whole-core CT-scan image data provides an excellent tool for the selection of core plugs coring locations.
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Yin, C. "Detectability of Electrical Anisotropy Using Marine MT". W 67th EAGE Conference & Exhibition. European Association of Geoscientists & Engineers, 2005. http://dx.doi.org/10.3997/2214-4609-pdb.1.h015.

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J. Senos Matias, M. "Electrical anisotropy parameters and resistivity sounding interpretation". W 5th EEGS-ES Meeting. European Association of Geoscientists & Engineers, 1999. http://dx.doi.org/10.3997/2214-4609.201406405.

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Christensen, Niels Bøie. "The Determination of Electrical Anisotropy Using Surface Electric and Electromagnetic Methods". W Symposium on the Application of Geophysics to Engineering and Environmental Problems 1998. Environment and Engineering Geophysical Society, 1998. http://dx.doi.org/10.4133/1.2922495.

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Bøie Christensen, Niels. "The Determination Of Electrical Anisotropy Using Surface Electric And Electromagnetic Methods". W 11th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems. European Association of Geoscientists & Engineers, 1998. http://dx.doi.org/10.3997/2214-4609-pdb.203.1998_014.

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B. Christensen, N. "Can electrical anisotropy be determined using surface electrical and electromagnetic methods?" W 4th EEGS Meeting. European Association of Geoscientists & Engineers, 1998. http://dx.doi.org/10.3997/2214-4609.201407230.

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Ellis, M. H., L. M. MacGregor, P. Newton, R. Keirstead, S. Bouchrara, Y. Zhou i H. Tseng. "Investigating Electrical Anisotropy Drivers across the Barents Sea". W 79th EAGE Conference and Exhibition 2017. Netherlands: EAGE Publications BV, 2017. http://dx.doi.org/10.3997/2214-4609.201701217.

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Li, X., i L. B. Pedersen. "Controlled-source tensor magnetotelluric detection of electrical anisotropy". W 54th EAEG Meeting. European Association of Geoscientists & Engineers, 1992. http://dx.doi.org/10.3997/2214-4609.201410566.

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Hordt, A., K. -M. Strack, K. Vozoff i A. Ziolkowski. "Resolving electrical anisotropy using long-offset transient electromagnetics". W 55th EAEG Meeting. European Association of Geoscientists & Engineers, 1993. http://dx.doi.org/10.3997/2214-4609.201411463.

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Raporty organizacyjne na temat "Electrical anisotropy"

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Connell, S., T. J. Katsube, P. A. Hunt i D. Walker. Textural characteristics of rocks that display significant electrical anisotropy. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1999. http://dx.doi.org/10.4095/210193.

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Constable, S., R. Lu, P. Kannberg, L. A. Stern, W. L. Du Frane i J. J. Roberts. In situ and laboratory evidence for high electrical anisotropy in marine gas hydrate. Office of Scientific and Technical Information (OSTI), styczeń 2020. http://dx.doi.org/10.2172/1597594.

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Beskok, Ali, Michael Bevan, Dimitris Lagoudas, Zoubeida Ounaies, Pradipkumar Bahukudumbi i William Everett. Reversible Control of Anisotropic Electrical Conductivity using Colloidal Microfluidic Networks. Fort Belvoir, VA: Defense Technical Information Center, kwiecień 2007. http://dx.doi.org/10.21236/ada482538.

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Friedman, Shmuel, Jon Wraith i Dani Or. Geometrical Considerations and Interfacial Processes Affecting Electromagnetic Measurement of Soil Water Content by TDR and Remote Sensing Methods. United States Department of Agriculture, 2002. http://dx.doi.org/10.32747/2002.7580679.bard.

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Time Domain Reflectometry (TDR) and other in-situ and remote sensing dielectric methods for determining the soil water content had become standard in both research and practice in the last two decades. Limitations of existing dielectric methods in some soils, and introduction of new agricultural measurement devices or approaches based on soil dielectric properties mandate improved understanding of the relationship between the measured effective permittivity (dielectric constant) and the soil water content. Mounting evidence indicates that consideration must be given not only to the volume fractions of soil constituents, as most mixing models assume, but also to soil attributes and ambient temperature in order to reduce errors in interpreting measured effective permittivities. The major objective of the present research project was to investigate the effects of the soil geometrical attributes and interfacial processes (bound water) on the effective permittivity of the soil, and to develop a theoretical frame for improved, soil-specific effective permittivity- water content calibration curves, which are based on easily attainable soil properties. After initializing the experimental investigation of the effective permittivity - water content relationship, we realized that the first step for water content determination by the Time Domain Reflectometry (TDR) method, namely, the TDR measurement of the soil effective permittivity still requires standardization and improvement, and we also made more efforts than originally planned towards this objective. The findings of the BARD project, related to these two consequential steps involved in TDR measurement of the soil water content, are expected to improve the accuracy of soil water content determination by existing in-situ and remote sensing dielectric methods and to help evaluate new water content sensors based on soil electrical properties. A more precise water content determination is expected to result in reduced irrigation levels, a matter which is beneficial first to American and Israeli farmers, and also to hydrologists and environmentalists dealing with production and assessment of contamination hazards of this progressively more precious natural resource. The improved understanding of the way the soil geometrical attributes affect its effective permittivity is expected to contribute to our understanding and predicting capability of other, related soil transport properties such as electrical and thermal conductivity, and diffusion coefficients of solutes and gas molecules. In addition, to the originally planned research activities we also investigated other related problems and made many contributions of short and longer terms benefits. These efforts include: Developing a method and a special TDR probe for using TDR systems to determine also the soil's matric potential; Developing a methodology for utilizing the thermodielectric effect, namely, the variation of the soil's effective permittivity with temperature, to evaluate its specific surface area; Developing a simple method for characterizing particle shape by measuring the repose angle of a granular material avalanching in water; Measurements and characterization of the pore scale, saturation degree - dependent anisotropy factor for electrical and hydraulic conductivities; Studying the dielectric properties of cereal grains towards improved determination of their water content. A reliable evaluation of the soil textural attributes (e.g. the specific surface area mentioned above) and its water content is essential for intensive irrigation and fertilization processes and within extensive precision agriculture management. The findings of the present research project are expected to improve the determination of cereal grain water content by on-line dielectric methods. A precise evaluation of grain water content is essential for pricing and evaluation of drying-before-storage requirements, issues involving energy savings and commercial aspects of major economic importance to the American agriculture. The results and methodologies developed within the above mentioned side studies are expected to be beneficial to also other industrial and environmental practices requiring the water content determination and characterization of granular materials.
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Choe, W., M. Ono i C. S. Chang. Temperature anisotropy in a cyclotron resonance heated tokamak plasma and the generation of poloidal electric field. Office of Scientific and Technical Information (OSTI), listopad 1994. http://dx.doi.org/10.2172/10196164.

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Koos, D. A., V. L. Shannon i G. L. Richmond. Surface Dipole and Electric Quadrupole Contributions to the Anisotropic Second Harmonic Generation from Noble Metal Surfaces. Fort Belvoir, VA: Defense Technical Information Center, maj 1992. http://dx.doi.org/10.21236/ada252254.

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Salem, H. S. Detailed results of petrophysical, electric, anisotropic, and elastic parameters at one meter depth increments for six Hibernia wells. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/183954.

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Salem, H. S. Detailed results of petrophysical, electric, anisotropic, and elastic parameters at one meter depth increments for eight Terra Nova wells. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/183955.

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