Preliminary Evaluation of Electrical Resistance Tomography for Imaging Palm Trunks

2016 ◽  
Vol 42 (2) ◽  
Author(s):  
Monica Elliott ◽  
Timothy Broschat ◽  
Lothar Göcke
Keyword(s):  
Electrical Resistivity ◽  
Cross Sections ◽  
Electrical Resistance ◽  
Fungal Pathogens ◽  
Wood Decay ◽  
Preliminary Evaluation ◽  
Electrical Resistance Tomography ◽  
High Electrical Resistivity ◽  
Southern Florida ◽  
Syagrus Romanzoffiana

In a preliminary study, electrical resistance tomography (ERT) was used to obtain trunk images of Syagrus romanzoffiana, a common ornamental palm grown in southern Florida, U.S. Seven palms, four healthy and three diseased, were evaluated in the middle of the dry season, with four located in an irrigated site and three in a non-irrigated site. Two healthy and three diseased palms were felled and cross sections obtained to examine their internal structure and compare to the tomograms obtained. ERT was effective in illustrating the relative electrical resistance value of healthy palms, as the tomograms obtained for palms situated in the irrigated site (low electrical resistivity) were distinctly different from the tomograms of palms situated in the non-irrigated site (high electrical resistivity). ERT was also effective in visualizing internal palm trunk areas affected by the fungal pathogens Ganoderma zonatum, a wood decay pathogen, and Fusarium oxysporum f. sp. palmarum, a vascular wilt pathogen, as these areas had a low electrical resistivity.

Electrical resistivity of coal-bearing rocks under high temperature and the detection of coal fires using electrical resistance tomography

2015 ◽  
Vol 204 (2) ◽  
pp. 1316-1331 ◽  
Author(s):  
Zhenlu Shao ◽  
Deming Wang ◽  
Yanming Wang ◽  
Xiaoxing Zhong ◽  
Xiaofei Tang ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
High Temperature ◽  
Electrical Resistance ◽  
Electrical Resistance Tomography ◽  
Coal Fires

TEM of Pyrolytic Al2O3 and Ta-Al2O3 Thin Films on Silicon

1974 ◽  
Vol 32 ◽  
pp. 474-475
Author(s):  
R. M. Anderson
Keyword(s):  
Thin Films ◽  
Electrical Resistivity ◽  
Cross Sections ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Deposition Rates ◽  
Metal Insulator ◽  
Semiconductor Structures ◽  
High Electrical Resistivity ◽  
Amorphous Structures

Pyrolytically deposited Al2O3, thin films are employed as dielectrics in metal-insulator-semiconductor structures used for insulated-gate field-effect transistors. Ideally, very thin Al2O3 films should have smooth surfaces, uniform cross-sections and high electrical resistivity. These requirements are best met by amorphous Al2O3, film microstructures. Pyrolysis of amorphous Al2O3 films must be undertaken at temperatures lower than 700°C with a concomitant low deposition rate. The incorporation of Ta in the Al2O3 yields amorphous structures at deposition tempera tures of about 800-900°C with substantially higher deposition rates.

EVANOHM

Alloy Digest ◽  
1960 ◽  
Vol 9 (4) ◽  
Keyword(s):  
Electrical Resistivity ◽  
Low Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Temperature Coefficient ◽  
Base Alloy ◽  
Nickel Base Alloy ◽  
Temperature Coefficient Of Resistance ◽  
High Electrical Resistivity ◽  
Nickel Base

Abstract EVANOHM is a nickel-base alloy having low temperature coefficient of resistance and high electrical resistivity. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on joining. Filing Code: Ni-57. Producer or source: Wilbur B. Driver Company.

EVANOHM ALLOY S

Alloy Digest ◽  
1989 ◽  
Vol 38 (7) ◽  
Keyword(s):  
Electrical Resistivity ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Temperature Coefficient ◽  
Electromotive Force ◽  
Temperature Coefficient Of Resistance ◽  
Resistance Wire ◽  
High Electrical Resistivity ◽  
Optimum Stability

Abstract EVANOHM alloy S offers optimum stability and flexibility with regard to both size and required temperature coefficient of resistance. Its extremely low electromotive force vs copper together with its high electrical resistivity are highly desirable properties in a precision resistance wire. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance as well as joining. Filing Code: Ni-373. Producer or source: Wilbur B. Driver Company.

HIPERCO 15

Alloy Digest ◽  
2002 ◽  
Vol 51 (10) ◽  
Keyword(s):  
Electrical Resistivity ◽  
Cobalt Content ◽  
Heat Treating ◽  
High Saturation Magnetization ◽  
Soft Magnetic ◽  
Magnetic Alloys ◽  
Soft Magnetic Alloys ◽  
High Electrical Resistivity ◽  
Technology Corporation ◽  
Carpenter Technology Corporation

Abstract Hiperco Alloy 15 is a development in soft magnetic alloys that combines the properties of high saturation, magnetization, high electrical resistivity, and lower cobalt content. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on forming and heat treating. Filing Code: FE-124. Producer or source: Carpenter Technology Corporation.

scholarly journals Optimisation of Sensor Electrode Size for in Electrical Resistance Tomography Implementing Conducting Boundary Strategy

2021 ◽  
Vol 1874 (1) ◽  
pp. 012077
Author(s):  
Suzanna Ridzuan Aw ◽  
Ruzairi Abdul Rahim ◽  
Fazlul Rahman Mohd Yunus ◽  
Mohd Hafiz Fazalul Rahiman ◽  
Yasmin Abdul Wahab ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Electrical Resistance Tomography ◽  
Electrode Size ◽  
Sensor Electrode

scholarly journals Identifying Changes in Sediment Texture along an Ephemeral Gravel-Bed Stream Using Electrical Resistivity Tomography 2D and 3D

2021 ◽  
Vol 11 (7) ◽  
pp. 3030
Author(s):  
Marcos A. Martínez-Segura ◽  
Carmelo Conesa-García ◽  
Pedro Pérez-Cutillas ◽  
Pedro Martínez-Pagán ◽  
Marco D. Vásconez-Maza
Keyword(s):  
Electrical Resistivity ◽  
Cross Sections ◽  
Electrical Resistivity Tomography ◽  
Environmental Changes ◽  
Subsurface Layer ◽  
Sediment Texture ◽  
Borehole Data ◽  
Resistivity Tomography ◽  
Gravel Bed ◽  
Basin Scale

Differences in deposit geometry and texture with depth along ephemeral gravel-bed streams strongly reflect fluctuations in bedload which are due to environmental changes at the basin scale and to morphological channel adjustments. This study combines electrical resistivity tomography (ERT) with datasets from borehole logs to analyse the internal geometry of channel cross-sections in a gravel-bed ephemeral stream (southeast Spain). The survey was performed through longitudinal and transverse profiles in the upper channel stretch, of 14 to 30 m in length and 3 to 6 m in depth, approximately. ERT values were correlated with data on sediment texture as grain size distribution, effective grain sizes, sorting, and particle shape (Zingg’s classification). The alluvial channel-fills showed the superposition of four layers with uneven thickness and arrangement: (1) the softer rocky substrate (<1000 Ω.m); (2) a thicker intermediate layer (1000 to 2000 Ω.m); and (3) an upper set composed of coarse gravel and supported matrix, ranging above 2000 Ω.m, and a narrow subsurface layer, which is the most resistive (>5000 Ω.m), corresponding to the most recent armoured deposits (gravel and pebbles). The ERT results coupled with borehole data allowed for determining the horizontal and vertical behaviour of the materials in a 3D model, facilitating the layer identification.

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