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403 results on '"Suleman, Afzal"'

1. Adaptive Distributed Observer-based Model Predictive Control for Multi-agent Formation with Resilience to Communication Link Faults

Author

Xu, Binyan, Dai, Yufan, Suleman, Afzal, and Shi, Yang

Subjects
Electrical Engineering and Systems Science - Systems and Control
Abstract

In order to address the nonlinear multi-agent formation tracking control problem with input constraints and unknown communication faults, a novel adaptive distributed observer-based distributed model predictive control method is developed in this paper. This design employs adaptive distributed observers in local control systems to estimate the leader's state, dynamics, and relative positioning with respect to the leader. Utilizing the estimated data as local references, the original formation tracking control problem can be decomposed into several fully localized tracking control problems, which can be efficiently solved by the local predictive controller. Through the incorporation of adaptive distributed observers, this proposed design not only enhances the resilience of distributed formation tracking against communication faults but also simplifies the distributed model predictive control formulation.

Published
2024

24. Development of a Series Hybrid Multirotor

Author

Castellani, Nicholas, primary, Pedrosa, Francisco, additional, Matlock, Jay, additional, Mazur, Anna, additional, Łowczycki, Krzysztof, additional, Widera, Patryk, additional, Zawadzki, Kamil, additional, Lipka, Karol, additional, and Suleman, Afzal, additional

Published
2024
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28. Synthesis of Gelatin Methacryloyl Analogs and Their Use in the Fabrication of pH-Responsive Microspheres.

Author

Valente, Karolina, Boice, Geneviève N., Polglase, Cameron, Belli, Roman G., Bourque, Elaina, Suleman, Afzal, and Brolo, Alexandre

Subjects
DRUG delivery systems, MICROFLUIDIC devices, BIOMEDICAL engineering, TISSUE engineering, GELATIN, HYDROGELS
Abstract

pH-responsive hydrogels have numerous applications in tissue engineering, drug delivery systems, and diagnostics. Gelatin methacryloyl (GelMA) is a biocompatible, semi-synthetic polymer prepared from gelatin. When combined with aqueous solvents, GelMA forms hydrogels that have extensive applications in biomedical engineering. GelMA can be produced with different degrees of methacryloyl substitution; however, the synthesis of this polymer has not been tuned towards producing selectively modified materials for single-component pH-responsive hydrogels. In this work, we have explored two different synthetic routes targeting different gelatin functional groups (amine, hydroxyl, and/or carboxyl) to produce two GelMA analogs: gelatin A methacryloyl glycerylester (polymer A) and gelatin B methacrylamide (polymer B). Polymers A and B were used to fabricate pH-responsive hydrogel microspheres in a flow-focusing microfluidic device. At neutral pH, polymer A and B microspheres displayed an average diameter of ~40 µm. At pH 6, microspheres from polymer A showed a swelling ratio of 159.1 ± 11.5%, while at pH 10, a 288.6 ± 11.6% swelling ratio was recorded for polymer B particles. [ABSTRACT FROM AUTHOR]

Published
2024
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40. Accounting for Murabahah – Reviewing the Need for Exclusive Accounting Standards

Author

Ozair Siddiqui, null Muhammad Khaleequzzaman, and Muhammad Suleman Afzal

Subjects
Polymers and Plastics
Abstract

Purpose: This paper examines the need for exclusive financial reporting standards for Islamic financial transactions by considering the accounting treatment of deferred payment Murabahah, as practiced in Pakistan. Being analogous to the conventional banking model, Murabahah is one of the most widely deployed modes in Islamic banks. The paper compares the quality of presentation of deferred payment Murabahah as practiced, following both conventional and Islamic accounting standards. Design: The paper presents the deferred payment Murabahah (credit sale) using International Financial Reporting Standards (IFRSs) and Islamic Financial Accounting Standards (IFASs) and collects the opinion of experts (accountants, academicians, and Islamic bankers) on the extracts of the prepared financial statements. The opinions are centered on three qualitative characteristics of the financial information (relevance, faithful representation, and comparability) and a t-test is applied to examine the statistical significance of the difference of opinions received. Findings: The results show that the overall quality score for IFRSs is higher than the IFASs for the selected qualitative characteristics. However, the difference observed is not significant, advocating the possibility of the harmonization among both Islamic and conventional accounting practices of the financial intuitions operating in Pakistan. Originality: Earlier studies (Morshed (2022); El-Halaby, Albarrak, and Grassa (2020); Ullah (2020); Ibrahim and Ling (2016)) do not directly compare the presentation of the Islamic financial instruments by applying the financial reporting standards issued by AAOIFI and IASB on same instrument. This paper addresses this gap by comparing the qualitative characteristics of presented financial information for deferred payment Murabahah as guided by conventional and Islamic accounting standards by introducing an innovative approach for presentation (from the perspective of a credit sale). The paper also compares the accounting treatment of IFRSs with IFAS 1 (Pakistan), which has not yet been done. Implications: Based on the findings of the paper, it is recommended that, like Malaysia, the IFIs in Pakistan should adopt the IFRS framework. The focus of the regulatory bodies functioning in Pakistan should be to improve existing accounting standards through meaningful engagement with standard-setting bodies and take an active part in making IFRSs more compatible with the nature of Islamic financial transactions. An instrument-wise handbook should be published for the IFIs to help in the application of the IFRS framework, ensuring a Shariah-compliant presentation where alternative measuring and valuing approaches are allowed by the framework.

Published
2022

45. Contributors

Author

Afonso, Frederico, primary, Airoldi, Alessandro, additional, Ameduri, Salvatore, additional, Amendola, Gianluca, additional, Amiryants, Gennady A., additional, Amoroso, Francesco, additional, Antunes, Alexandre, additional, Apicella, Alfonso, additional, Apuleo, Gianvito, additional, Arena, Maurizio, additional, Arnold, Uwe T.P., additional, Barbarino, Silvestro, additional, Bellucci, Marco, additional, Bettini, Paolo, additional, Blackwell, Robert, additional, Botez, Ruxandra M., additional, Castillo Acero, Miguel Á., additional, Chedrik, Vasily, additional, Chedrik, Alexander, additional, Chevagin, Alexander, additional, Ciminello, Monica, additional, Concilio, Antonio, additional, De Gaspari, Alessandro, additional, de la Escalera, Federico Martín, additional, Di Landro, Luca Angelo, additional, Dimino, Ignazio, additional, do Vale, José Lobo, additional, Dumont, Antoine, additional, Efimov, Roman, additional, Esposito, Sergio, additional, Essa, Yasser, additional, Evenblij, Rolf, additional, Gilardelli, Alessandro, additional, Gratias, André, additional, Grigorie, Teodor L., additional, Iannuzzo, Generoso, additional, Ishmuratov, Fanil, additional, Kulesh, Vladimir, additional, Kursakov, Innokentiy, additional, Kuruliuk, Ksenia, additional, Kuzmina, Svetlana, additional, Lau, Fernando, additional, Lawrence, Thomas H., additional, Lecce, Leonardo, additional, Lima, Grace, additional, Lorber, Peter F., additional, Lühring, Andreas, additional, Lysenkov, Alexander, additional, Magnifico, Marco, additional, Malenko, Vladimir, additional, Malyutin, Victor, additional, Mistry, Mihir P., additional, Nagel, Christof, additional, Noviello, Maria Chiara, additional, Odaguil, Felipe, additional, Pagano, Antonio, additional, Pasini, Damiano, additional, Pecora, Modesto, additional, Pecora, Rosario, additional, Peter, Fabian, additional, Pronin, Mikhail, additional, Rea, Francesco, additional, Ricci, Sergio, additional, Rossi, Lorenzo, additional, Russo, Salvatore, additional, Sala, Giuseppe, additional, Saprykin, Andrey, additional, Schorsch, Oliver, additional, Schueller, Martin, additional, Shalaev, Sergey, additional, Storm, Stefan, additional, Strobl, Tobias, additional, Stumpf, Eike, additional, Suleman, Afzal, additional, Timokhin, Viktor, additional, Verrastro, Maurizio, additional, Vigliotti, Andrea, additional, Welsh, William A., additional, Wilbur, Matthew L., additional, and Zichenkov, Mikhail, additional

Published
2018
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46. Strategies towards a more sustainable aviation: A systematic review

Author

Afonso, Frederico, primary, Sohst, Martin, additional, Diogo, Carlos M.A., additional, Rodrigues, Simão S., additional, Ferreira, Ana, additional, Ribeiro, Inês, additional, Marques, Ricardo, additional, Rego, Francisco F.C., additional, Sohouli, Abdolrasoul, additional, Portugal-Pereira, Joana, additional, Policarpo, Hugo, additional, Soares, Bruno, additional, Ferreira, Bruna, additional, Fernandes, Edgar C., additional, Lau, Fernando, additional, and Suleman, Afzal, additional

Published
2023
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50. An experimental study on the effect of length and orientation of embedded FBG sensors on the signal properties under fatigue loading

Author

Kocaman Esat S., Keulen Casey J., Akay Erdem, Yildiz Mehmet, Turkmen Halit S., and Suleman Afzal

Subjects
fatigue monitoring, fiber bragg gratings, fiber optics, smart structures, structural health monitoring, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Fiber Bragg grating (FBG) sensors provide excellent capability for the structural health monitoring (SHM) of load-bearing structures by allowing for local internal strain measurements within structures. However, the integration of these sensors to composite materials is associated with several challenges that have to be addressed to have the correct strain measurement and in turn to perform reliable SHM. One of the most important issues is the presence of uneven strain fields around FBGs, which significantly affect the response of the sensors and hence the reliability of the acquired data. The uniformity of the strain fields around sensors is important for dependable data acquisition; however, to generate such a condition, tow width-to-FBG length relationship, optical fiber configuration with respect to reinforcement fiber orientation, and crack density resulting from fatigue loading are very important factors that have to be considered. In this paper, these issues are addressed by investigating the signal properties of FBG sensors with 1 and 10 mm lengths embedded within the composite specimens during the manufacturing process. After fatigue testing of the specimens, it is shown that 1-mm-long FBGs embedded in-line with adjacent reinforcement fibers with tow widths of ∼2 mm provide much more reliable signals than 10-mm-long FBGs embedded perpendicular to adjacent tows.

Published
2016
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