Browsing Research of Qatar University Young Scientists Center by Author "Ahmad, Zubair"
Now showing items 21-39 of 39
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Mechanical properties of human hepatic tissues to develop liver-mimicking phantoms for medical applications
Lemine, Aicha S.; Ahmad, Zubair; Al-Thani, Noora J.; Hasan, Anwarul; Bhadra, Jolly ( Springer , 2023 , Article Review)Using liver phantoms for mimicking human tissue in clinical training, disease diagnosis, and treatment planning is a common practice. The fabrication material of the liver phantom should exhibit mechanical properties similar ... -
A meta-analysis to gauge the impact of pedagogies employed in mixed-ability high school biology classrooms
Santhosh, Malavika E.; Bhadra, Jolly; Ahmad, Zubair; Al-Thani, Noora ( Springer Nature , 2024 , Article Review)This article systematically reviews the pedagogies employed in mixed-ability high school biology classrooms to spotlight the most effective educational model, in terms of learning gains. A meta-analysis was performed on ... -
Metal halide-based photodetector using one-dimensional MAPbI3 micro rods
Raza, Ehsan; Ahmad, Zubair; Mishra, Arti; Aziz, Fakhra ( Springer , 2020 , Article)In the present work, we report the fabrication of a photodetector using methylammonium lead iodide perovskite (MAPbI3) micro rod. Photosensitivity of the Ag/MAPbI3/Ag photodetector has been studied under various light ... -
Microstructure and mechanical properties of aluminum matrix composites with bimodal-sized hybrid NbC-B4C reinforcements
Aicha S., Lemine; Fayyaz, Osama; Yusuf, Moinuddin; Shakoor, R.A.; Ahmad, Zubair; Bhadra, Jolly; Al-Thani, Noora J.... more authors ... less authors ( Elsevier , 2022 , Article)Aluminum (Al) is an earth-abundant metal recognized with superior properties for vital applications in the aerospace and transportation industries. Structural components of Al exhibit poor performance due to its inherent ... -
A numerical approach to study the effect of bandgap and electron affinity in HTL-free perovskite solar cells and design of two-terminal silicon/perovskite tandem solar cell
Ehsan, Raza; Bhadra, Jolly; Asif, Muhammad; Aziz, Fakhra; Al-Thani, Noora J.; Ahmad, Zubair... more authors ... less authors ( Elsevier , 2023 , Article)The hole-transport layer (HTL) free perovskite solar cells with carbon electrode (c-PSCs) have garnered significant attention owing to their simple design, cost-effectiveness, and good stability. However, the power conversion ... -
Numerical modeling and performance optimization of carbon-based hole transport layer free perovskite solar cells
Ehsan, Raza; Ahmad, Zubair; Asif, Muhammad; Aziz, Fakhra; Riaz, Kashif; Mehmood, Muhammad Qasim; Bhadra, Jolly; Al-Thani, Noora J.... more authors ... less authors ( Elsevier , 2022 , Article)Owing to low production cost and ease of processing, hole-transport layer (HTL) free carbon electrode-based perovskite solar cells (c-PSCs) have emerged as a potential photovoltaic (PV) technology. Despite this, c-PCSs ... -
Numerical simulation analysis towards the effect of charge transport layers electrical properties on cesium based ternary cation perovskite solar cells performance
Ehsan, Raza; Ahmad, Zubair; Aziz, Fakhra; Asif, Muhammad; Ahmed, Ayyaz; Riaz, Kashif; Bhadra, Jolly; Al-Thani, Noora J.... more authors ... less authors ( Elsevier , 2021 , Article)In the present study, the device modeling of inverted architecture based on ITO/HTL/perovskite absorber/ETL/Ag was performed using a one-dimensional solar cell capacitance simulation (SCAPS-1D) program. Initially, device ... -
Numerical simulation to optimize the efficiency of HTM-free perovskite solar cells by ETM engineering
Sumbel, Ijaz; Raza, Ehsan; Ahmad, Zubair; Zubair, Muhammad; Mehmood, Muhammad Qasim; Mehmood, Haris; Massoud, Yehia; Rehman, M. Muqeet... more authors ... less authors ( Elsevier , 2023 , Article)Perovskite solar cells based on carbon electrodes (c-PSCs) without a hole transport material (HTM) have gained considerable interest owing to their cost-effective and simplified structure. However, their application is ... -
Optimum sintering method and temperature for cold compact Bismuth Telluride pellets for thermoelectric applications
F. Jaldurgam, Farheen; Ahmad, Zubair; Touati, Farid; Al Ashraf, Abdulla; Shakoor, Abdul; Bhadra, Jolly; J. Al-Thani, Noora; Suk Han, Dong; Altahtamouni, Talal... more authors ... less authors ( Elsevier , 2021 , Article)This work intends to investigate the optimum sintering method and temperature that can improve the efficiency of bismuth telluride cold compact pellets, for the thermoelectric applications. Different p-type and n-type ... -
Pedagogical models to implement effective stem research experience programs in high school students
Ahmad, Zubair; Ammar, Mohammad; Al-Thani, Noora J. ( MDPI , 2021 , Article Review)High school research experience programs (HSREPs) provide opportunities for true science education and expose students to scientific investigations in laboratory settings. Various HSREPs models have been practiced to shape ... -
Performance optimization of CH3NH3Pb(I1-xBrx)3 based perovskite solar cells by comparing different ETL materials through conduction band offset engineering
Ayyaz, Ahmed; Riaz, Kashif; Mehmood, Haris; Tauqeer, Tauseef; Ahmad, Zubair ( Elsevier , 2020 , Article)Numerical simulations can provide the physical insights into the carrier transport mechanism in the solar cells, and the factors influencing their performance. In this paper, perovskite solar cell (PSC) based on the mixed ... -
Polyvinylpyridine–carbon dots composite-based novel humidity sensor
Khouloud, Jlassi; Mallick, Shoaib; Ben Ali, Ahmed; Mutahir, Hafsa; Salauddin, Sayma Akhter; Ahmad, Zubair; Tennouga, Lahcene; Chehimi, Mohamed... more authors ... less authors ( Springer , 2023 , Article)This work describes the rational design of thin films based on PVP-modified carbon dots for potential resistive humidity sensing application, prepared via spin coating on ITO substrates. The modified carbon dots were ... -
The Prominent Roles of Undergraduate Mentors in an Online Near-Peer Mentoring Model
Al-Thani, Noora Jabor; Santhosh, Malavika E.; Bhadra, Jolly; Ahmad, Zubair ( MDPI , 2023 , Article)This study exemplifies a STEM-based online near-peer mentoring approach, incorporating 56 students (high and middle school mentees) and 16 secondary undergraduates (UG) mentors. The various constructive roles of UG mentors ... -
Promising transparent and flexible thermoelectric modules based on p-type CuI thin films—A review
Lemine, Aicha S.; Bhadra, Jolly; Al-Thani, Noora J.; Ahmad, Zubair ( Elsevier , 2022 , Article Review)The state-of-the-art thermoelectric technology owns a unique capability of direct, noise-free, and efficient conversion of waste heat into valuable electricity. The conventional thermoelectric generators are complex and ... -
Review on two-terminal and four-terminal crystalline-silicon/perovskite tandem solar cells; progress, challenges, and future perspectives
Ehsan, Raza; Ahmad, Zubair ( Elsevier , 2022 , Article Review)Silicon (Si) solar cells are the dominant and well-developed solar technology holding more than 95% share of the photovoltaic market with efficiencies over 26%. Still, this value is far away from the Shockley–Queisser limit ... -
The Role of Multidisciplinary Chemistry Informal Research Programs in Building Research Competencies and Attitudes
Al-Thani, Noora J.; Saad, Azza; Siby, Nitha; Bhadra, Jolly; Ahmad, Zubair ( American Chemical Society , 2022 , Article)This article is focused on the effectiveness of an innovative research-based learning model that employs chemistry-based research projects in developing high school students' research competency and attitudes. The ... -
A STEM model to engage students in sustainable science education through sports: A case study in Qatar
Ali, Ruba; Bhadra, Jolly; Siby, Nitha; Ahmad, Zubair; Al-Thani, Noora Jabor ( MDPI , 2021 , Article)Sports has the potential to integrate with different scientific subjects, including materials science and engineering, making it an ideal approach to enhance the students’ affinity toward sustainable education in science, ... -
A tailored innovative model of “research internship” aimed at strengthening research competencies in STEM undergraduates
Siby, Nitha; Ammar, Mohammad; Bhadra, Jolly; Elawad, Elmogiera Fadlallh Elsaye; Al-Thani, Noora Jabor; Ahmad, Zubair... more authors ... less authors ( Emerald Publishing Limited , 2024 , Article)Purpose: Research internships are integral components of undergraduate programs that nurture students' skill sets. However, the current trend of these internships adopting a direct apprenticeship model, often termed ... -
Thermal and mechanical stability of microwave sintered cold compact bismuth telluride thermoelectric material
Farheen F., Jaldurgam; Ahmad, Zubair; Touati, Farid; Ashraf, Abdullah Al; Bhadra, Jolly; Altahtamouni, Talal; Al-Thani, Noora J.... more authors ... less authors ( Elsevier , 2022 , Article)Both p-type and n-type bismuth telluride (Bi2Te3)-based thermoelectric materials demonstrate high thermoelectric efficiency in the low-temperature thermoelectric modules, but their constrained thermal and mechanical stability ...