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5,466 results on '"Soliman, Ahmed"'

1. Calibration Measurements of the BICEP3 and BICEP Array CMB Polarimeters from 2017 to 2024

Author

Giannakopoulos, Christos, Vergès, Clara, Ade, P. A. R., Ahmed, Zeeshan, Amiri, Mandana, Barkats, Denis, Thakur, Ritoban Basu, Bischoff, Colin A., Beck, Dominic, Bock, James J., Boenish, Hans, Buza, Victor, Cheshire IV, James R., Connors, Jake, Cornelison, James, Crumrine, Michael, Cukierman, Ari Jozef, Denison, Edward, Dierickx, Marion, Duband, Lionel, Eiben, Miranda, Elwood, Brodi D., Fatigoni, Sofia, Filippini, Jeff P., Fortes, Antonio, Gao, Min, Goeckner-Wald, Neil, Goldfinger, David C., Grayson, James A., Grimes, Paul K., Hall, Grantland, Halal, George, Halpern, Mark, Hand, Emma, Harrison, Sam A., Henderson, Shawn, Hubmayr, Johannes, Hui, Howard, Irwin, Kent D., Kang, Jae Hwan, Karkare, Kirit S., Kefeli, Sinan, Kovac, J. M., Kuo, Chao-Lin, Lau, King, Lautzenhiser, Margaret, Lennox, Amber, Liu, Tongtian, Megerian, Koko G., Miller, Oliver, Minutolo, Lorenzo, Moncelsi, Lorenzo, Nakato, Yuka, Nguyen, H. T., O'brient, Roger, Patel, Anika, Petroff, Matthew A., Polish, Anna R., Precup, Nathan, Prouve, Thomas, Pryke, Clement, Reintsema, Carl D., Romand, Thibault, Salatino, Maria, Schillaci, Alessandro, Schmitt, Benjamin, Singari, Baibhav, Soliman, Ahmed, Germaine, Tyler St, Steiger, Aaron, Steinbach, Bryan, Sudiwala, Rashmi, Thompson, Keith L., Tsai, Calvin, Tucker, Carole, Turner, Anthony D., Vieregg, Abigail G., Wandui, Albert, Weber, Alexis C., Willmert, Justin, Wu, Wai Ling K., Yang, Hung-I, Yu, Cyndia, Zeng, Lingzhen, Zhang, Cheng, and Zhang, Silvia

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The BICEP3 and BICEP Array polarimeters are small-aperture refracting telescopes located at the South Pole designed to measure primordial gravitational wave signatures in the Cosmic Microwave Background (CMB) polarization, predicted by inflation. Constraining the inflationary signal requires not only excellent sensitivity, but also careful control of instrumental systematics. Both instruments use antenna-coupled orthogonally polarized detector pairs, and the polarized sky signal is reconstructed by taking the difference in each detector pair. As a result, the differential response between detectors within a pair becomes an important systematic effect we must control. Additionally, mapping the intensity and polarization response in regions away from the main beam can inform how sidelobe levels affect CMB measurements. Extensive calibration measurements are taken in situ every austral summer for control of instrumental systematics and instrument characterisation. In this work, we detail the set of beam calibration measurements that we conduct on the BICEP receivers, from deep measurements of main beam response to polarized beam response and sidelobe mapping. We discuss the impact of these measurements for instrumental systematics studies and design choices for future CMB receivers., Comment: 13 pages, 7 figures, 1 table, Proceedings paper SPIE 2024

Published
2024

2. Design and Performance of 30/40 GHz Diplexed Focal Plane for BICEP Array

Author

Shiu, Corwin, Soliman, Ahmed, O'Brient, Roger, Steinbach, Bryan, Bock, James J., Frez, Clifford F., Jones, William C., Megerian, Krikor G., Moncelsi, Lorenzo, Schillaci, Alessandro, Turner, Anthony D., Weber, Alexis C., Zhang, Cheng, and Zhang, Silvia

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

We demonstrate a wide-band diplexed focal plane suitable for observing low-frequency foregrounds that are important for cosmic microwave background polarimetry. The antenna elements are composed of slotted bowtie antennas with 60% bandwidth that can be partitioned into two bands. Each pixel is composed of two interleaved 12$\times$12 pairs of linearly polarized antenna elements forming a phased array, designed to synthesize a symmetric beam with no need for focusing optics. The signal from each antenna element is captured in-phase and uniformly weighted by a microstrip summing tree. The antenna signal is diplexed into two bands through the use of two complementary, six-pole Butterworth filters. This filter architecture ensures a contiguous impedance match at all frequencies, and thereby achieves minimal reflection loss between both bands. Subsequently, out-of-band rejection is increased with a bandpass filter and the signal is then deposited on a transition-edge sensor bolometer island. We demonstrate the performance of this focal plane with two distinct bands, 30 and 40 GHz, each with a bandwidth of $\sim$20 and 15 GHz, respectively. The unequal bandwidths between the two bands are caused by an unintentional shift in diplexer frequency from its design values. The end-to-end optical efficiency of these detectors are relatively modest, at 20-30%, with an efficiency loss due to an unknown impedance mismatch in the summing tree. Far-field beam maps show good optical characteristics with edge pixels having no more than $\sim$ 5% ellipticity and $\sim$10-15% peak-to-peak differences for A-B polarization pairs., Comment: 17 pages, 13 figures. Accepted for publication in ApJS

Published
2024
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3. Brain Stroke Segmentation Using Deep Learning Models: A Comparative Study

Author

Soliman, Ahmed, Yousif, Yousif, Ibrahim, Ahmed, Zafari-Ghadim, Yalda, Rashed, Essam A., and Mabrok, Mohamed

Subjects
Electrical Engineering and Systems Science - Image and Video Processing, Computer Science - Computer Vision and Pattern Recognition, Computer Science - Machine Learning
Abstract

Stroke segmentation plays a crucial role in the diagnosis and treatment of stroke patients by providing spatial information about affected brain regions and the extent of damage. Segmenting stroke lesions accurately is a challenging task, given that conventional manual techniques are time consuming and prone to errors. Recently, advanced deep models have been introduced for general medical image segmentation, demonstrating promising results that surpass many state of the art networks when evaluated on specific datasets. With the advent of the vision Transformers, several models have been introduced based on them, while others have aimed to design better modules based on traditional convolutional layers to extract long-range dependencies like Transformers. The question of whether such high-level designs are necessary for all segmentation cases to achieve the best results remains unanswered. In this study, we selected four types of deep models that were recently proposed and evaluated their performance for stroke segmentation: a pure Transformer-based architecture (DAE-Former), two advanced CNN-based models (LKA and DLKA) with attention mechanisms in their design, an advanced hybrid model that incorporates CNNs with Transformers (FCT), and the well-known self-adaptive nnUNet framework with its configuration based on given data. We examined their performance on two publicly available datasets, and found that the nnUNet achieved the best results with the simplest design among all. Revealing the robustness issue of Transformers to such variabilities serves as a potential reason for their weaker performance. Furthermore, nnUNet's success underscores the significant impact of preprocessing and postprocessing techniques in enhancing segmentation results, surpassing the focus solely on architectural designs

Published
2024

27. Quantitative live cell imaging of a tauopathy model enables the identification of a polypharmacological drug candidate that restores physiological microtubule interaction

Author

Pinzi, Luca, Conze, Christian, Bisi, Nicolo, Torre, Gabriele Dalla, Soliman, Ahmed, Monteiro-Abreu, Nanci, Trushina, Nataliya I., Krusenbaum, Andrea, Dolouei, Maryam Khodaei, Hellwig, Andrea, Christodoulou, Michael S., Passarella, Daniele, Bakota, Lidia, Rastelli, Giulio, and Brandt, Roland

Published
2024
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31. Guanidine dicycloamine-based analogs: green chemistry synthesis, biological investigation, and molecular docking studies as promising antibacterial and antiglycation leads

Author

El-Remaily, Mahmoud Abd El Aleem. A. A., Aboelez, Moustafa O., Ezelarab, Hend A. A., Selim, Heba Mohammed Refat M., Taha, Enas A., Mohamed, Shaaban K., Soliman, Ahmed M., Abdallah, Mohamed S., Fawy, Mariam A., Hassany, Mohamed A., Ahmed, Nessar, Alsaggaf, Azhaar T., El Hamd, Mohamed A., and Kamel, Moumen S.

Published
2024
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37. Monte Carlo Simulation of Lane-Emden Type Equations Arising in Astrophysics

Author

El-Essawy, Samah H., Nouh, Mohamed I., Soliman, Ahmed A., Rahman, Helal I. Abdel, and Abd-Elmougod, Gamal A.

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Monte Carlo (MC) method played an essential role in many areas of human activity and has found application in many branches of physical science. This paper proposes a computational technique based on MC algorithms to solve Lane-Emden (LE) type equations. We analyze four LE equations arising in astrophysics: the positive and negative indices of the polytropic gas spheres, the isothermal gas sphere, and the white dwarf equation. We calculated eleven models (i.e., eleven LE equations) of the positive index polytropes, nine for the negative index polytrope, the isothermal gas sphere, and the white dwarf equation. Comparing the MC and numerical/analytical models gives good agreement for the four LE equations under study.

Published
2022

38. Global Research Trends and Chronological Evolution of Recycling of Mining Wastes: A Bibliometric Analysis

Author

Safhi, Amine el Mahdi, Soliman, Ahmed, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Cui, Zhen-Dong, Series Editor, Lu, Xinzheng, Series Editor, Desjardins, Serge, editor, Poitras, Gérard J., editor, Alam, M. Shahria, editor, and Sanchez-Castillo, Xiomara, editor

Published
2024
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39. Mix Design for Scaled-Down Models

Author

El Naggar, Abdelmoneim, Youssef, Maged A., El Naggar, Hany, Soliman, Ahmed, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Cui, Zhen-Dong, Series Editor, Lu, Xinzheng, Series Editor, Desjardins, Serge, editor, Poitras, Gérard J., editor, Alam, M. Shahria, editor, and Sanchez-Castillo, Xiomara, editor

Published
2024
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40. Potential Recycling of Excavated Tunnel Materials from Grand Paris Express Disposal as a Construction Material

Author

Maherzi, Walid, Safhi, Amine el Mahdi, Soliman, Ahmed, Abriak, Nor-Edine, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Cui, Zhen-Dong, Series Editor, Lu, Xinzheng, Series Editor, Desjardins, Serge, editor, Poitras, Gérard J., editor, Alam, M. Shahria, editor, and Sanchez-Castillo, Xiomara, editor

Published
2024
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41. Thermal Properties of Ultra-High-Performance Concrete: A Review

Author

Rady, Mahmoud, Soliman, Ahmed, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Cui, Zhen-Dong, Series Editor, Lu, Xinzheng, Series Editor, Desjardins, Serge, editor, Poitras, Gérard J., editor, Alam, M. Shahria, editor, and Sanchez-Castillo, Xiomara, editor

Published
2024
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43. Minimizing Energy Consumption of Educational Buildings by Testing Alternatives of Green Envelopes in Alexandria

Author

Soliman, Ahmed, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, Gawad, Iman O., Editorial Board Member, Nayyar, Anand, Editorial Board Member, Amer, Mourad, Series Editor, Battisti, Alessandra, editor, Piselli, Cristina, editor, Strauss, Eric J, editor, Dobjani, Etleva, editor, and Kristo, Saimir, editor

Published
2024
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44. Utilizing Alkali-Activated Materials for Repair Applications: A Review

Author

Khaled, Ahmed, Soliman, Ahmed, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Gupta, Rishi, editor, Sun, Min, editor, Brzev, Svetlana, editor, Alam, M. Shahria, editor, Ng, Kelvin Tsun Wai, editor, Li, Jianbing, editor, El Damatty, Ashraf, editor, and Lim, Clark, editor

Published
2024
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45. Evaluating the Performance of Phase Change Materials in Alkali-Activated Materials

Author

Meftahi, Farshad, Soliman, Ahmed, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Gupta, Rishi, editor, Sun, Min, editor, Brzev, Svetlana, editor, Alam, M. Shahria, editor, Ng, Kelvin Tsun Wai, editor, Li, Jianbing, editor, El Damatty, Ashraf, editor, and Lim, Clark, editor

Published
2024
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46. Alkali-Activated Concrete Workability and Effect of Various Admixtures: A Review

Author

Elsayed, Nourhan, Soliman, Ahmed, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Gupta, Rishi, editor, Sun, Min, editor, Brzev, Svetlana, editor, Alam, M. Shahria, editor, Ng, Kelvin Tsun Wai, editor, Li, Jianbing, editor, El Damatty, Ashraf, editor, and Lim, Clark, editor

Published
2024
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47. Fiber Effects on Phase Change Materials Concrete Properties

Author

Rady, Mahmoud, Soliman, Ahmed, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Gupta, Rishi, editor, Sun, Min, editor, Brzev, Svetlana, editor, Alam, M. Shahria, editor, Ng, Kelvin Tsun Wai, editor, Li, Jianbing, editor, El Damatty, Ashraf, editor, and Lim, Clark, editor

Published
2024
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48. Evaluating the Performance of Alkali-Activated Materials Containing Phase Change Materials: A Review

Author

Golizadeh, Amirhossein, Meftahi, Farshad, Soliman, Ahmed, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Gupta, Rishi, editor, Sun, Min, editor, Brzev, Svetlana, editor, Alam, M. Shahria, editor, Ng, Kelvin Tsun Wai, editor, Li, Jianbing, editor, El Damatty, Ashraf, editor, and Lim, Clark, editor

Published
2024
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49. Applications of Agro-waste in the Construction Industry: A Review

Author

Shirkouh, Arman Hatami, Soliman, Ahmed, Palacios, Joahnn, Godbout, Stéphane, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Gupta, Rishi, editor, Sun, Min, editor, Brzev, Svetlana, editor, Alam, M. Shahria, editor, Ng, Kelvin Tsun Wai, editor, Li, Jianbing, editor, El Damatty, Ashraf, editor, and Lim, Clark, editor

Published
2024
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