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Your search keyword '"Elnady, Tamer"' showing total 126 results
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126 results on '"Elnady, Tamer"'

1. Precise characterization of a corridor-shaped structure in Khufu’s Pyramid by observation of cosmic-ray muons

Author

Procureur, Sébastien, Morishima, Kunihiro, Kuno, Mitsuaki, Manabe, Yuta, Kitagawa, Nobuko, Nishio, Akira, Gomez, Hector, Attié, David, Sakakibara, Ami, Hikata, Kotaro, Moto, Masaki, Mandjavidze, Irakli, Magnier, Patrick, Lehuraux, Marion, Benoit, Théophile, Calvet, Denis, Coppolani, Xavier, Kebbiri, Mariam, Mas, Philippe, Helal, Hany, Tayoubi, Mehdi, Marini, Benoit, Serikoff, Nicolas, Anwar, Hamada, Steiger, Vincent, Takasaki, Fumihiko, Fujii, Hirofumi, Satoh, Kotaro, Kodama, Hideyo, Hayashi, Kohei, Gable, Pierre, Guerriero, Emmanuel, Mouret, Jean-Baptiste, Elnady, Tamer, Elshayeb, Yasser, and Elkarmoty, Mohamed

Published
2023
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3. Discovery of a big void in Khufu's Pyramid by observation of cosmic-ray muons

Author

Morishima, Kunihiro, Kuno, Mitsuaki, Nishio, Akira, Kitagawa, Nobuko, Manabe, Yuta, Moto, Masaki, Takasaki, Fumihiko, Fujii, Hirofumi, Satoh, Kotaro, Kodama, Hideyo, Hayashi, Kohei, Odaka, Shigeru, Procureur, Sébastien, Attié, David, Bouteille, Simon, Calvet, Denis, Filosa, Christopher, Magnier, Patrick, Mandjavidze, Irakli, Riallot, Marc, Marini, Benoit, Gable, Pierre, Date, Yoshikatsu, Sugiura, Makiko, Elshayeb, Yasser, Elnady, Tamer, Ezzy, Mustapha, Guerriero, Emmanuel, Steiger, Vincent, Serikoff, Nicolas, Mouret, Jean-Baptiste, Charlès, Bernard, Helal, Hany, and Tayoubi, Mehdi

Subjects
Physics - Instrumentation and Detectors
Abstract

The Great Pyramid or Khufu's Pyramid was built on the Giza Plateau (Egypt) during the IVth dynasty by the pharaoh Khufu (Cheops), who reigned from 2509 to 2483 BC. Despite being one of the oldest and largest monuments on Earth, there is no consensus about how it was built. To better understand its internal structure, we imaged the pyramid using muons, which are by-products of cosmic rays that are only partially absorbed by stone. The resulting cosmic-ray muon radiography allows us to visualize the known and potentially unknown voids in the pyramid in a non-invasive way. Here we report the discovery of a large void (with a cross section similar to the Grand Gallery and a length of 30 m minimum) above the Grand Gallery, which constitutes the first major inner structure found in the Great Pyramid since the 19th century. This void, named ScanPyramids Big Void, was first observed with nuclear emulsion films installed in the Queen's chamber (University of Nagoya), then confirmed with scintillator hodoscopes set up in the same chamber (KEK) and re-confirmed with gas detectors outside of the pyramid (CEA). This large void has therefore been detected with a high confidence by three different muon detection technologies and three independent analyses. These results constitute a breakthrough for the understanding of Khufu's Pyramid and its internal structure. While there is currently no information about the role of this void, these findings show how modern particle physics can shed new light on the world's archaeological heritage., Comment: Nature (2017)

Published
2017
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16. Testing and Validation of a Novel Segmented Wind Turbine Blade.

Author

Abdulaziz, Ahmed H., Elsabbagh, Adel, and Elnady, Tamer

Abstract

This article presents the structural testing and analyses of a segmented horizontal axis wind turbine blade. The blade's mass and center of gravity are first determined. Free vibration tests are performed, and the natural frequencies are obtained. Static bending tests in flapwise and edgewise directions are conducted with acoustics emission monitoring. The segmented blade was able to sustain the test loads. However, some superficial defects appeared and were detected by the acoustics emission sensors. Finally, the resonant fatigue test is performed for ten million cycles. The variation of the stiffness against the loading cycles is used to diagnose the initiation of fatigue cracks. Based on the testing results, some modifications are proposed in the design and manufacturing approaches to avoid the noted defects. [ABSTRACT FROM AUTHOR]

Published
2019
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17. Discovery of a big void in Khufu’s Pyramid by observation of cosmic-ray muons

Author

Morishima, Kunihiro, primary, Kuno, Mitsuaki, additional, Nishio, Akira, additional, Kitagawa, Nobuko, additional, Manabe, Yuta, additional, Moto, Masaki, additional, Takasaki, Fumihiko, additional, Fujii, Hirofumi, additional, Satoh, Kotaro, additional, Kodama, Hideyo, additional, Hayashi, Kohei, additional, Odaka, Shigeru, additional, Procureur, Sébastien, additional, Attié, David, additional, Bouteille, Simon, additional, Calvet, Denis, additional, Filosa, Christopher, additional, Magnier, Patrick, additional, Mandjavidze, Irakli, additional, Riallot, Marc, additional, Marini, Benoit, additional, Gable, Pierre, additional, Date, Yoshikatsu, additional, Sugiura, Makiko, additional, Elshayeb, Yasser, additional, Elnady, Tamer, additional, Ezzy, Mustapha, additional, Guerriero, Emmanuel, additional, Steiger, Vincent, additional, Serikoff, Nicolas, additional, Mouret, Jean-Baptiste, additional, Charlès, Bernard, additional, Helal, Hany, additional, and Tayoubi, Mehdi, additional

Published
2017
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28. Modelling and Characterization of Perforates in Lined Ducts and Mufflers

Author

Elnady, Tamer

Subjects
Lined ducts, Perforates, Mufflers, Flow duct, Acoustic impedance, Hot stream liners, Collocation, Liners, Hard splices
Abstract

Increased national and international travel over the lastdecades has caused an increase in the global number ofpassengers using different means of transportation. Greateffort is being directed to improving the noisy environment inthe residential community. This is to face the growing strictnoise requirements which are implemented by international noiseregulatory authorities, governments, and local airports. Thereis also a strong competition between different manufacturers tomake their products quieter. The propulsion system in anaircraft is the major source of noise during relevant flightconditions. The engine noise in a vehicle dominates the totalradiated noise at low speeds especially inside cities. Manyrecent studies on noise reduction involve the use of perforatedplates in the air and gas flow ducting connected to the engine.This thesis deals with the modelling of perforates as anabsorbent. There are many difficulties in using liners in theseapplications. The most important is that there is no largesurface area to which the linings may be applied. Equally, theenvironment in which linings have to survive is hostile.Therefore, liners have to be carefully tailored in order toachieve the most efficient attenuation. The full-scalesimulation testing, which is usually necessary to define thenoise attenuation produced by a liner installation, is bothtime-consuming and expensive. Therefore, a need for accuratemodels is a must. This thesis fills some gaps in the impedancemodelling of perforated liners. It also concentrates on thosecomplicated situations of sound propagation in ducts that weresolved earlier using Finite Element Methods. Alternateanalytical solutions to these problems are developed here,which gives more physical insight into the results. The key design parameter of perforates is the acousticimpedance. The impedance is what determines their efficiency toabsorb sound waves. A semi empirical impedance model wasdeveloped to be capable of accurately predicting the linerimpedance as a function of its physical properties and thesurrounding conditions. It was compared to all previous modelsin the literature. Nothing in the literature has been reportedon the effect of temperature on the perforate impedance,therefore a complete study was performed. A new inverseanalytical impedance measurement technique was proposed. It isbased on educing the impedance value based on the measurementof the attenuation across a lined duct section. Twoapplications were further considered: The effect of hard stripsin lined ducts on there attenuation properties; and themodelling of perforations in a complicated automotive mufflersystem. Keywords:Perforates–Liners–Acousticimpedance–Hot stream liners–Hard splices–Mufflers–Lined ducts–Collocation–Flowduct.

Published
2004

37. Quenching of bandgaps by flow noise.

Author

Sanchez‐Dehesa, Jose, primary, Elnady, Tamer, additional, Elsabbagh, Adel, additional, Akl, Wael, additional, Mohamady, Osama, additional, Garcia‐Chocano, Victor, additional, Torrent, Daniel, additional, and Cervera, Francisco, additional

Published
2009
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43. Effect of Water Hammer in Relatively Long Inclined Pipelines

Author

Dalleli, Manel, Hadj-Taïeb, Ezzeddine, Schmitt, Christian, Azari, Zitouni, Haddar, Mohamed, Series editor, Bartelmus, Walter, Series editor, Chaari, Fakher, Series editor, Zimroz, Radoslaw, Series editor, Abbes, Mohamed Slim, editor, Choley, Jean-Yves, editor, Boukharouba, Taoufik, editor, Elnady, Tamer, editor, Kanaev, Andrei, editor, and Ben Amar, Mounir, editor

Published
2015
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44. Modeling and Simulation for Vertical Rail Vehicle Dynamic Vibration with Comfort Evaluation

Author

Graa, Mortadha, Nejlaoui, Mohamed, Houidi, Ajmi, Affi, Zouhaier, Romdhane, Lotfi, Haddar, Mohamed, Series editor, Bartelmus, Walter, Series editor, Chaari, Fakher, Series editor, Zimroz, Radoslaw, Series editor, Abbes, Mohamed Slim, editor, Choley, Jean-Yves, editor, Boukharouba, Taoufik, editor, Elnady, Tamer, editor, Kanaev, Andrei, editor, and Ben Amar, Mounir, editor

Published
2015
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45. A Comparison between Two Reliability Based Optimization Strategies of Tuned Mass Damper Parameters under Stochastic Loading

Author

Mrabet, Elyes, Guedri, Mohamed, Ghanmi, Samir, Soula, Mohamed, Ichchou, Mohamed, Haddar, Mohamed, Series editor, Bartelmus, Walter, Series editor, Chaari, Fakher, Series editor, Zimroz, Radoslaw, Series editor, Abbes, Mohamed Slim, editor, Choley, Jean-Yves, editor, Boukharouba, Taoufik, editor, Elnady, Tamer, editor, Kanaev, Andrei, editor, and Ben Amar, Mounir, editor

Published
2015
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46. Early Detection of Gear Failure by Vibration Analysis

Author

Merzoug, Mustapha, Ait-Sghir, Khalid, Miloudi, Abdelhamid, Dron, Jean Paul, Bolaers, Fabrice, Haddar, Mohamed, Series editor, Bartelmus, Walter, Series editor, Chaari, Fakher, Series editor, Zimroz, Radoslaw, Series editor, Abbes, Mohamed Slim, editor, Choley, Jean-Yves, editor, Boukharouba, Taoufik, editor, Elnady, Tamer, editor, Kanaev, Andrei, editor, and Ben Amar, Mounir, editor

Published
2015
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49. Localization of Impact on a Beam by Time Reversal Method

Author

Chaterbache, Omar, Miloudi, Abdelhamid, Haddar, Mohamed, Series editor, Bartelmus, Walter, Series editor, Chaari, Fakher, Series editor, Zimroz, Radoslaw, Series editor, Abbes, Mohamed Slim, editor, Choley, Jean-Yves, editor, Boukharouba, Taoufik, editor, Elnady, Tamer, editor, Kanaev, Andrei, editor, and Ben Amar, Mounir, editor

Published
2015
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50. The Extended Finite Element Method for Cracked Incompressible Hyperelastic Structures Analysis

Author

Zaafouri, Mehrez, Wali, Mondher, Abid, Said, Jamal, Mohammed, Dammak, Fakhreddine, Haddar, Mohamed, Series editor, Bartelmus, Walter, Series editor, Chaari, Fakher, Series editor, Zimroz, Radoslaw, Series editor, Abbes, Mohamed Slim, editor, Choley, Jean-Yves, editor, Boukharouba, Taoufik, editor, Elnady, Tamer, editor, Kanaev, Andrei, editor, and Ben Amar, Mounir, editor

Published
2015
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