The correlation of 2D-resistivity and magnetic methods in fault verification at northern Sumatra, Indonesia

2015 ◽  
Author(s):  
Nur Aminuda Kamaruddin ◽  
Rosli Saad ◽  
M. M. Nordiana ◽  
I. N. Azwin
Keyword(s):  
Magnetic Methods ◽  
Fault Verification ◽  
2D Resistivity

Fault Verification Simulation for Light-Emission Microscopy and Liquid-Crystal Analysis

1996 ◽  
Author(s):  
N. Kuji ◽  
T. Takeda ◽  
S. Nakamura ◽  
Y. Komine
Keyword(s):  
Liquid Crystal ◽  
Light Emission ◽  
Logic Model ◽  
Spice Simulation ◽  
Logic Models ◽  
Model Derivation ◽  
Emission Microscopy ◽  
Derivation Method ◽  
Fault Verification

Abstract A new logic-model derivation method for leak faults observed by light-emission microscopy (LEM) or in liquid-crystal analysis (LCA) has been developed to verify those faults by comparing them with failures observed on an LSI tester. Since CMOS devices display various kinds of faulty behavior depending on leak resistance, it is essential to include the effects of this resistance in logic models. Considering that the resistance of leaks observed in LEM and LCA ranges from 10 to 10,000 ohm, the new logic models have been derived so that the leak fault could be easily incorporated into logic simulators without SPICE simulation. The feasibility of the proposed method has been demonstrated by using it to diagnose LEM and LCA faults causing logic failure in a 20k-gate logic LSI circuit.

scholarly journals Linear geological structure, traverse orientation and structure resolution and characterisation using 1D and 2D resistivity images

2021 ◽  
Vol 10 (1) ◽  
pp. 170-184
Author(s):  
Martins Olusola Olorunfemi ◽  
Ademakinwa George Oni ◽  
Taiwo Kazeem Fadare ◽  
Odunayo Emmanuel Bamidele
Keyword(s):  
Geological Structure ◽  
2D Resistivity

Gravity and magnetic methods at the turn of the millennium

Geophysics ◽  
2001 ◽  
Vol 66 (1) ◽  
pp. 36-37 ◽  
Author(s):  
R. O. Hansen
Keyword(s):  
Turn Of The Millennium ◽  
Magnetic Methods ◽  
Maximum Value ◽  
Gravity And Magnetic ◽  
New Instrumentation ◽  
New Instruments

Innovation in the 1980s and 1990s has been dominated by new instrumentation. Only recently has processing and interpretation technology appeared which will extract the maximum value from the new instruments. In the following sections, the instrumentation advances are outlined. Processing and interpretation advances are sketched in the last section.

Potencial of rock-magnetic methods in paleoecological reconstructions: case study of Mikhailovtsement reference section (Ryazan region)

2019 ◽  
pp. 30-38
Author(s):  
I. A. Stepanov ◽  
A. Yu. Kazansky ◽  
D. N. Kiselev ◽  
L. R. Kosareva ◽  
M. A. Rogov ◽  
...  
Keyword(s):  
Sea Level ◽  
Basin Evolution ◽  
Sea Level Fluctuations ◽  
Level Change ◽  
Magnetic Methods ◽  
Moscow Syneclise ◽  
Global Trend ◽  
Paleoecological Reconstructions ◽  
Reference Section

On the basis of detailed, combined rock-magnetic, lithological, and micropaleontological study of the Mikhailovtsement section of the Moscow syneclise (Ryazan region), the fluctuations in Central Russian Sea level in Callovian–Early Oxfordian were reconstructed. According to the variations of rock-magnetic parameters over the section, seven rock-magnetic intervals were established which correspond to different stages of basin evolution. These stages are compared with sea level fluctuations established on the basis of changes in the lithology of rocks and the ostracod complexes. In general, the nature of sea level change in Callovian–Oxfordian, revealed by combination of the methods during the study of Mikhailovtsement section coincides with global trend.

Magnetic properties of PM in indoor/outdoor domestic environments 

2021 ◽  
Author(s):  
Aruã Da Silva Leite ◽  
Melina Macouin ◽  
Sonia Rousse ◽  
Jean-François Leon ◽  
Loïc Drigo ◽  
...  
Keyword(s):  
Iron Oxides ◽  
Cost Effective ◽  
Tree Bark ◽  
Indoor Environments ◽  
Magnetic Mineralogy ◽  
Magnetic Methods ◽  
Tree Barks ◽  
Domestic Environments ◽  
One Year ◽  
The City

<p>The finer fraction of the particulate matter (PM) is the most harmful health wise, as it has more capacity to reach deeper parts of the respiratory system. Among other constituents, PM also contains iron oxides, allowing for the use of magnetic methods in its investigation as proxies for the whole of PM. Those methods present advantages in comparison to traditional ones, being quick, cost effective and sensible to investigate iron oxides among PM. </p><p>To better understand the risks related to PM exposition in the domestic context, the assessment of magnetic parameters may be used in outdoor and indoor environments, giving us information on the concentration of iron oxides (and consequently, PM) and its dispersion from one environment to the other. </p><p>We developed a citizen sciences experiment in the city of Toulouse, France. Tree barks were used as bio-collectors. Garlands composed of tree bark pieces were distributed to the population in May-2019, and placed in both indoors and outdoors of flats and homes to capture PM. They were retrieved after one year. Measurement of magnetic susceptibility, ARM, SIRM, S -ratio and estimation of superparamagnetic concentration were performed. A total of 86 bio-collectors kits were successfully analyzed. The preliminary results indicate a higher concentration of iron oxides outdoors, with a mean difference between outdoor and indoor measurements of 6.58x10<sup>-9</sup>m<sup>3</sup>/kg and 1.38x10<sup>-5</sup>Am<sup>2</sup>/kg in susceptibility and SIRM respectively. The concentration of the SP fraction also follows this trend of higher outdoor values. The magnetic mineralogy is mostly dominated by low coercivity magnetite-like carriers.</p><div> <div> <div> </div> </div> <div> <div> </div> </div> </div>

Magnetic methods in monitoring changes of the technical condition of splices in steel cord conveyor belts

2019 ◽  
Vol 104 ◽  
pp. 462-470 ◽  
Author(s):  
Tomasz Kozłowski ◽  
Ryszard Błażej ◽  
Leszek Jurdziak ◽  
Agata Kirjanów-Błażej
Keyword(s):  
Technical Condition ◽  
Magnetic Methods ◽  
Conveyor Belts ◽  
Steel Cord

scholarly journals LWD DATA INVERSION FOR STRUCTURE WITH ANGULAR UNCONFORMITY

2021 ◽  
Vol 2 (1) ◽  
pp. 336-344
Author(s):  
Anna S. Astrakova ◽  
Elena V. Konobriy ◽  
Dmitry Yu. Kushnir ◽  
Nikolay N. Velker ◽  
Gleb V. Dyatlov
Keyword(s):  
Real Time ◽  
Optimization Method ◽  
Parametric Model ◽  
Model Parameters ◽  
Time Inversion ◽  
Water Contact ◽  
2D Inversion ◽  
Angular Unconformity ◽  
Oil Water ◽  
2D Resistivity

Non-structural traps and reservoir flanks are characterized by angular unconformities. Angular unconformity between dipping formation and sub-horizontal oil-water contact is common in the North Sea fields. This paper presents an approach to real-time inversion of LWD resistivity data for the scenario with angular unconformity. The approach utilizes artificial neural networks (ANNs) for calculating the tool responses in parametric surface-based 2D resistivity models. We propose a parametric model with two non-parallel boundaries suitable for scenarios with angular unconformity and pinch-out. Training of ANNs for this parametric model is performed using a database containing samples with the model parameters and corresponding tool responses. ANNs are the kernel of 2D inversion based on the Levenberg-Marquardt optimization method. To demonstrate applicability of our approach and compare with the results of 1D inversion, we analyze Extra Deep Azimuthal Resistivity tool responses in a 2D synthetic model. It is shown that 1D inversion determines either the position of the oil-water contact or dipping layers structure. At the same time, 2D inversion makes it possible to correctly reconstruct the positions of non-parallel boundaries. Performance of 2D inversion based on ANNs is suitable for real-time applications.

scholarly journals Subsurface investigations of landslides using geophysical methods : geoelectrical applications in the Swabian Alb (Germany)

2006 ◽  
Vol 61 (3) ◽  
pp. 201-208 ◽  
Author(s):  
R. Bell ◽  
J.-E. Kruse ◽  
A. Garcia ◽  
T. Glade ◽  
A. Hördt
Keyword(s):  
Soil Moisture ◽  
Geophysical Methods ◽  
Economic Damage ◽  
The World ◽  
Subsurface Investigation ◽  
3D Information ◽  
Moisture Conditions ◽  
2D And 3D ◽  
2D Resistivity

Abstract. Landslides occur frequently all over the world, causing at times considerable economic damage, injuries and even death. In order to improve hazard assessment, common landslide types of a given region need to be investigated in detail. While traditional techniques of subsurface investigation are expensive and only provide point information, geophysical methods are suitable tools for gathering 2D and 3D information on the subsurface quickly, reliably and cost-effectively. In this study, the suitability and limitations of 2D resistivity for the determination of landslide extent, structure and soil moisture conditions are presented. For this purpose, two identical profiles were taken during a two-month period. Significant differences in electrical resistivity (>1000 Ωm) due to varying soil moisture conditions were observed. Using various inversion parameters, it was possible to model two distinct subsurface images. Regrettably, the sliding plane could not be detected reliably, possibly due to the homogeniety of the landslide material and underlying bedrock.

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