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9 results on '"Ramirez-Pinero A"'

2. ScanPyramids project: Overview on the Validity and Limitations of Non-destructive Techniques

Author

Mohamed Elkarmoty, Khalid Hela, Hussien Allam, Mohamed Ali, Mohamed Sholqamy, Amr Elbakri, Randa Deraz, Polina Pugacheva, Johannes Rupfle, Jochen Kollofrath, Clarimma Sessa, Olga Popovych, Benedikt Maier, Alejandro Ramirez Pinero, Thomas Schumacher, Sébastien Procureur, Hector Gomez, David Attié, Irakli Mandjavidze, Patrick Magnier, Marini Benoit, Pierre Gable, Emmanuel Guerriero, Nicolas Serikoff, Jean Baptiste Mouret, Bernard Charlès, Marion Lehuraux, Théophile Benoit, Denis Calvet, Xavier Coppolani, Mariam Kebbiri, Philippe Mas, Simon Bouteille, Kunihiro Morishima, Mitsuaki Kuno, Akira Nishio, Nobuko Kitagawa, Yuta Manabe, Fumihiko Takasaki, Hirofumi Fujii, Kotaro Satoh, Hidekazu Kodama, Kohei Hayashi, Shigeru Odaka, Yoshikatsu Date, Makiko Sugiura, Hamada Anwar, Mehdi Tayoubi, Hany Helal, and Christian U. Grosse

Subjects
Technology
Abstract

In 2017, ScanPyramids project (www.scanpyramids.org) published a paper in Nature (Morishima et al., 2017) revealing the discovery of a big void (ScanPyramids Big Void BV) observed with nuclear emulsion films (Muography), it has a cross-section similar to that of the Grand Gallery and a minimum length of 30 meters situated above the Grand Gallery. In addition, a geometrically non-identified void in the Northern Face of the Pyramid (ScanPyramids Northern Face Corridor SP-NFC) was detected as well in 2017 followed by further detailed and focused muography measurements up to 2022 (Morishima and Procureur et al., 2023). ScanPyramids SP-NFC corridor has been investigated in more detail with a wider set of non-destructive techniques. The result of GPR, Ultrasonic and image fusion detected precisely the location and shape of ScanPyramids SP-NFC (Elkarmoty and Rupfle et al.,2023). In this paper, we present overview on the application of Muography, Ground Penetrating Radar, Ultrasonic Tomography, and Electrical Resistivity Tomography on the Chevron of the Great Pyramid where ScanPyramids SPNFC is located behind. The objective of the NDT measurements is to detect the geometry, location, orientation, and extension of ScanPyramids SP-NFC with more than one NDT method. The paper addresses the validity and limitations of each method used providing the limitations of each technique in this particular case study.

Published
2023
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4. Modified Hyperspheres Algorithm to Trace Homotopy Curves of Nonlinear Circuits Composed by Piecewise Linear Modelled Devices

Author

H. Vazquez-Leal, V. M. Jimenez-Fernandez, B. Benhammouda, U. Filobello-Nino, A. Sarmiento-Reyes, A. Ramirez-Pinero, A. Marin-Hernandez, and J. Huerta-Chua

Subjects
Technology, Medicine, Science
Abstract

We present a homotopy continuation method (HCM) for finding multiple operating points of nonlinear circuits composed of devices modelled by using piecewise linear (PWL) representations. We propose an adaptation of the modified spheres path tracking algorithm to trace the homotopy trajectories of PWL circuits. In order to assess the benefits of this proposal, four nonlinear circuits composed of piecewise linear modelled devices are analysed to determine their multiple operating points. The results show that HCM can find multiple solutions within a single homotopy trajectory. Furthermore, we take advantage of the fact that homotopy trajectories are PWL curves meant to replace the multidimensional interpolation and fine tuning stages of the path tracking algorithm with a simple and highly accurate procedure based on the parametric straight line equation.

Published
2014
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5. Speed-up hyperspheres homotopic path tracking algorithm for PWL circuits simulations

Author

Uriel Filobello-Nino, J. Huerta-Chua, Hector Vazquez-Leal, Hamid M. Sedighi, R. Castaneda-Sheissa, A. Ramirez-Pinero, J.R. Laguna-Camacho, F. Castro-Gonzalez, L.A. Sarmiento-Reyes, Mohammad Mehdi Rashidi, and Victor Manuel Jimenez-Fernandez

Subjects
0209 industrial biotechnology, Piecewise linear, Multidisciplinary, Speedup, Computer science, Research, Transistor, 010103 numerical & computational mathematics, 02 engineering and technology, Homotopy continuation method, Path tracking algorithm, 01 natural sciences, Modified nodal analysis, Nonlinear circuits, law.invention, Piecewise linear function, 020901 industrial engineering & automation, CMOS, law, Path (graph theory), Point (geometry), 0101 mathematics, Algorithm, Electronic circuit, Multiple operating points
Abstract

In the present work, we introduce an improved version of the hyperspheres path tracking method adapted for piecewise linear (PWL) circuits. This enhanced version takes advantage of the PWL characteristics from the homotopic curve, achieving faster path tracking and improving the performance of the homotopy continuation method (HCM). Faster computing time allows the study of complex circuits with higher complexity; the proposed method also decrease, significantly, the probability of having a diverging problem when using the Newton–Raphson method because it is applied just twice per linear region on the homotopic path. Equilibrium equations of the studied circuits are obtained applying the modified nodal analysis; this method allows to propose an algorithm for nonlinear circuit analysis. Besides, a starting point criteria is proposed to obtain better performance of the HCM and a technique for avoiding the reversion phenomenon is also proposed. To prove the efficiency of the path tracking method, several cases study with bipolar (BJT) and CMOS transistors are provided. Simulation results show that the proposed approach can be up to twelve times faster than the original path tracking method and also helps to avoid several reversion cases that appears when original hyperspheres path tracking scheme was employed.

Published
2015

7. Modified Hyperspheres Algorithm to Trace Homotopy Curves of Nonlinear Circuits Composed by Piecewise Linear Modelled Devices

Author

A. Ramirez-Pinero, Arturo Sarmiento-Reyes, Uriel Filobello-Nino, Antonio Marin-Hernandez, Hector Vazquez-Leal, Victor Manuel Jimenez-Fernandez, Brahim Benhammouda, and J. Huerta-Chua

Subjects
Fine-tuning, Trace (linear algebra), Article Subject, Computer science, lcsh:T, Homotopy, lcsh:R, MathematicsofComputing_NUMERICALANALYSIS, lcsh:Medicine, General Medicine, Models, Theoretical, lcsh:Technology, General Biochemistry, Genetics and Molecular Biology, Piecewise linear function, Simple (abstract algebra), Trajectory, lcsh:Q, lcsh:Science, Algorithm, Homotopy analysis method, Algorithms, General Environmental Science, Parametric statistics, Research Article
Abstract

We present a homotopy continuation method (HCM) for finding multiple operating points of nonlinear circuits composed of devices modelled by using piecewise linear (PWL) representations. We propose an adaptation of the modified spheres path tracking algorithm to trace the homotopy trajectories of PWL circuits. In order to assess the benefits of this proposal, four nonlinear circuits composed of piecewise linear modelled devices are analysed to determine their multiple operating points. The results show that HCM can find multiple solutions within a single homotopy trajectory. Furthermore, we take advantage of the fact that homotopy trajectories are PWL curves meant to replace the multidimensional interpolation and fine tuning stages of the path tracking algorithm with a simple and highly accurate procedure based on the parametric straight line equation.

Published
2014

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