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9. Reconfigurable Multifunctional van der Waals Ferroelectric Devices and Logic Circuits

Author

Ram, Ankita, Maity, Krishna, Marchand, Cédric, Mahmoudi, Aymen, Kshirsagar, Aseem Rajan, Soliman, Mohamed, Taniguchi, Takashi, Watanabe, Kenji, Doudin, Bernard, Ouerghi, Abdelkarim, Reichardt, Sven, O'Connor, Ian, and Dayen, Jean-Francois

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

In this work, we demonstrate the suitability of Reconfigurable Ferroelectric Field-Effect- Transistors (Re-FeFET) for designing non-volatile reconfigurable logic-in-memory circuits with multifunctional capabilities. Modulation of the energy landscape within a homojunction of a 2D tungsten diselenide (WSe$_2$) layer is achieved by independently controlling two split-gate electrodes made of a ferroelectric 2D copper indium thiophosphate (CuInP$_2$S$_6$) layer. Controlling the state encoded in the Program Gate enables switching between p, n and ambipolar FeFET operating modes. The transistors exhibit on-off ratios exceeding 10$^6$ and hysteresis windows of up to 10 V width. The homojunction can change from ohmic-like to diode behavior, with a large rectification ratio of 10$^4$. When programmed in the diode mode, the large built-in p-n junction electric field enables efficient separation of photogenerated carriers, making the device attractive for energy harvesting applications. The implementation of the Re-FeFET for reconfigurable logic functions shows how a circuit can be reconfigured to emulate either polymorphic ferroelectric NAND/AND logic-in-memory or electronic XNOR logic with long retention time exceeding 10$^4$ seconds. We also illustrate how a circuit design made of just two Re-FeFETs exhibits high logic expressivity with reconfigurability at runtime to implement several key non-volatile 2-input logic functions. Moreover, the Re-FeFET circuit demonstrates remarkable compactness, with an up to 80% reduction in transistor count compared to standard CMOS design. The 2D van de Waals Re-FeFET devices therefore exhibit groundbreaking potential for both More-than-Moore and beyond-Moore future of electronics, in particular for an energy-efficient implementation of in-memory computing and machine learning hardware, due to their multifunctionality and design compactness., Comment: 23 pages, 5 figures; Supporting Information: 12 pages, 6 figures

Published
2023
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11. Green synthesis of silver nanoparticles from Bauhinia variegata and their biological applications

Author

Soliman Mohamed K. Y., Hashem Amr H., Al-Askar Abdulaziz A., AbdElgayed Gehad, and Salem Salem S.

Subjects
biosynthesis, silver nanoparticles, antimicrobial, antioxidant activity, antibiofilm, cytotoxicity, Chemistry, QD1-999
Abstract

The production of silver nanoparticles (Ag NPs) utilizing biological means with renewable resources is thought to be risk-free, environmentally benign, and safe. In this work, the capacity of Bauhinia variegata to produce Ag NPs was measured. Numerous methods, including UV–Vis spectroscopy, TEM, FTIR spectroscopy, and XRD, were employed for the analysis of the produced Ag NPs. Ag NP antimicrobial capacity has been examined through microtitreplate as well as agar well diffusion techniques. Ag NPs’ ability to scavenge free radicals at varying concentrations was assessed using the DPPH technique. The MICs were 1,000 µg·mL−1 against pathogenic microbes including Staphylococcus aureus, Pseudomonas aeruginosa, and Candida albicans, while 500 and 250 µg·mL−1 were versus Bacillus subtilis and Escherichia coli, respectively. Silver showed an intriguing antioxidant capacity, achieving IC50 of 46.23 μg·mL−1. Additionally, Ag NPs demonstrated possible anticancer action when applied to the carcinoma cell lines Caco-2, with IC50 of 396.2 μg·mL−1 and cytotoxicity toward normal Vero cell lines with IC50 of 609.45 μg·mL−1. Furthermore, Ag NPs demonstrated a range of antibiofilm activities toward S. aureus (MRSA). In conclusion, Ag NPs biosynthesized via B. variegata show promise for a variety of safe biological applications.

Published
2024
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19. The Effect of the Interaction between Crowdsourced Style and Cognitive Style on Developing Research and Scientific Thinking Skills

Author

Alabdulaziz, Mansour Saleh, Hassan, Hassan F., and Soliman, Mohamed W.

Abstract

This study aims to evaluate the effect of the interaction between crowdsourcing style and cognitive style on the development of research and scientific thinking skills among postgraduate students at Alexandria University, by designing an e-learning environment. The current research used an experimental approach with a quasi-experimental design. The research sample consisted of a random sample of 80 postgraduate students who were specializing in mathematics, educational technology, and other areas at the Faculty of Education. The measurement tools consisted of an achievement test, the observation card, cognitive style scale, and scientific thinking scale. Data were analyzed using two-way ANOVA analysis of variance. The results showed that there was a significant difference between crowdsourcing patterns (collaborative/competitive) in favor of the collaborative pattern. There was a significant difference between cognitive style (focusing/scanning) in favor of students who adopted the focusing style. There was a significant effect on the interaction between crowdsourcing patterns and cognitive style for each of the cognitive aspects of research skills in global databases through the e-learning environment based on the crowdsourcing pattern, the observation card of students' performance of those skills, and their scientific thinking. The researchers recommend benefiting from the results of the current research in the design of e-learning environments based on crowdsourced (competitive/collaborative) in general, and crowdsourced collaborative in particular because of their impact on the development of achievement, practical performance, and scientific thinking.

Published
2022

20. The Effect of Different Interaction Patterns in E-Training Environments in Developing the Skills of Producing Interactive Lessons for Middle School Mathematics Teachers

Author

Alibraheim, Essa A., Hassan, Hassan F., and Soliman, Mohamed W.

Abstract

The aim of this research is to treat the shortcomings of teacher training programs in Saudi Arabia. Some of these programs are not able to fulfill the requirements of professional development because they neglect the impact of different interaction patterns (group and content--individual, content, and trainer--group, content, and trainer) within the e-training environment. This research used the experimental approach with a quasi-experimental design. The research sample was limited to a random sample consisting of 60 mathematics teachers, who were randomly divided into three experimental groups, equally. The results revealed that there are statistically significant differences at 0.05 between the average scores for middle school mathematics teachers in the post application of the cognitive achievement test, observation card, and product evaluation card related to the skills of producing interactive lessons due to the impact of the different interaction patterns in the e-training environment.

Published
2022

26. The role of metaphor in the Israeli-Palestinian conflict a cognitive linguistic approach

Author

Ahmad Abdel Tawwab Sharaf Eldin, Wafya Hamouda, Walid Reda Ali, and Hoda Soliman Mohamed

Subjects
Cognitive linguistics, conflict framing, Israeli-Palestinian conflict, metaphor, political discourse, History, Fine Arts, Arts in general, NX1-820, General Works, History of scholarship and learning. The humanities, AZ20-999
Abstract

Metaphors have long been recognized as powerful tools that shape our understanding of the world. In the context of the Israeli-Palestinian conflict, metaphors play a crucial role in shaping perceptions and attitudes towards the conflict. This research explores the connection between Lakoff and Johnson's Conceptual Metaphor Theory and the role of metaphor in the Israeli-Palestinian conflict from a cognitive linguistic perspective. The study focuses on the use of metaphorical language by Israeli Prime Minister Benjamin Netanyahu and Palestinian Authority President Mahmoud Abbas during the period of April 2023 to September 2023. Applying Lakoff and Johnson's approach, the research aims to uncover the specific metaphors employed by these leaders to frame the conflict in a manner that serves their respective interests and narratives. The research objective is to gain a more nuanced understanding of how metaphors shape the discourse surrounding the Israeli-Palestinian conflict. By exploring the cognitive and linguistic strategies used by political actors, the study seeks to elucidate the underlying mechanisms through which metaphors can be leveraged to construct, perpetuate, and potentially transform the conflict narrative. The findings of this research are expected to offer valuable insights into the role of language in shaping perceptions, identity formation, and the justification of political actions within the context of the Israeli-Palestinian conflict. The analysis of metaphorical patterns used by the key stakeholders will illuminate how cognitive frames are established, maintained, and potentially challenged, ultimately contributing to a more comprehensive understanding of the conflict's dynamics.

Published
2024
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