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Browsing by Author "Noor-A-Alam, Mohammed"
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Item Construction and Use of a Concept Map in an Undergraduate Dynamics Class(ASEE PEER, 2022-08-23) Noor-A-Alam, Mohammed; Medez, Julie; IUPUC EngineeringWhile the use of technology in education has been rapidly increasing worldwide, the diversity and availability of information and study materials have been increasing at an even faster rate. However, presenting and explaining key course concepts in an effective and organized manner, as well as involving students in interactive learning experiences, are still key parts of teaching in higher education, more specifically, in achieving the educational objectives in the fundamental courses of science and engineering programs. Keeping this in prime consideration, the use of concept maps in basic engineering courses has been very effective and has gained growing attention in recent years. This work studied the use of a concept map in an undergraduate dynamics class. A two-phase hierarchical approach was used to construct two concept maps which were then demonstrated in the beginning of the course to allow students to see the key points of the entire course. The concept maps took the form of trees, with topics branching up from two broad topic areas at the bottom: dynamics of particles and dynamics of rigid bodies. The entire tree was climbed up as the course progressed. The students were asked to build their own concept map at the end of the semester with the goal of stimulating creativity as delineated by constructivism in contemporary pedagogy. A survey was carried out at the end of the course to study student perceptions of using the concept map. While students expressed different opinions on several questions, 100% of the participant students responded “I agree” to the survey item “The concept map was a useful resource for in-class activities”.Item Corrosion resistance and thermal stability of sputtered Fe44Al34Ti7N15 and Al61Ti11N28 thin films for prospective application in oil and gas industry(Elsevier, 2021-10-01) Maruf, Mahbub Alam; Rizvi, Syed Muhammad Mujtaba; Noor-A-Alam, Mohammed; Shin, Donghyun; Haider, Waseem; Shabib, Ishraq; Mechanical and Energy Engineering, School of Engineering and Technology, IUPUCFe-and Al-based thin-film metallic glass coatings (Fe44Al34Ti7N15 and Al61Ti11N28) were fabricated using magnetron co-sputtering technique, and their corrosion performances compared against wrought 316L stainless steel. The results of GI-XRD and XPS analyses demonstrated amorphous structure and oxide layer formation on the surface of the fabricated thin films, respectively. The potentiodynamic (PD) polarization test in chloride-thiosulfate (NH4Cl + Na2S2O3) solution revealed lower corrosion current (Icorr) (0.42 ± 0.02 μA/cm2 and 0.086 ± 0.001 μA/cm2 Vs. 0.76 ± 0.05 μA/cm2), lower passivation current (Ipass) (1.45 ± 0.03 μA/cm2 and 1.83 ± 0.07 μA/cm2 Vs. 1.98 ± 0.04 μA/cm2), and approximately six-fold higher breakdown potential (Ebd) for Fe- and Al-based coatings than those of wrought 316L stainless steel. Electrochemical Impedance Spectroscopy (EIS) of both films showed 4- and 2-fold higher charge transfer resistance (Rct), 7- and 2.5-times higher film resistance (Rf), lower film capacitance values (Qf) (10 ± 2.4 μS-sacm-2, and 5.41 ± 0.8 μS-sacm-2 Vs. 18 ± 2.21 μS-sacm-2), and lower double-layer capacitance values (Qdl) (31.33 ± 4.74 μS-sacm-2, and 15.3 ± 0.48 μS-sacm-2 Vs. 43 ± 4.23 μS-sacm-2), indicating higher corrosion resistance of the thin films. Cyclic Voltammetry (CV) scan exhibited that the passive films formed on the Fe- and Al-based coatings were more stable and less prone to pitting corrosion than the wrought 316L stainless steel. The surface morphology of both films via SEM endorsed the CV scan results, showing better resistance to pitting corrosion. Furthermore, the thermal analysis via TGA and DSC revealed the excellent thermal stability of the thin films over a wide temperature range typically observed in oil-gas industries.Item Digital Applications Using Real-Time Vehicle Exhaust Information(OSTI, 2020-09-01) Alam, Mohammad Fahad B.; Ahmed, Osman; Buractaon, Richard A.; Hossain, Akram; Noor-A-Alam, Mohammed; Alam, Md Jan E.; Mechanical and Energy Engineering, School of Engineering and TechnologyVehicle emission is a major source of air pollution that causes a significant number of deaths globally. It has a profound impact on energy and the environment as well. The existing vehicle emission monitoring system is unable to help mitigating the pollution properly and therefore, requires precise real-time pollution measurement. The purpose of this paper is to discuss novel applications using the real-time measurement of pollutants from a vehicle tailpipe where exhaust gases enter the environment. Today, it is possible to measure such emission due to the emergence of affordable digital technologies such as the Internet of Things (IoT), wireless connectivity, cloud platform, and artificial intelligence. This paper discusses how digital technologies can be used for real-time monitoring of NOx gas as a measure of vehicle emission and predictive analytics applications. A description of data collection and pre-processing methodologies, actual collected data, and an approach to identify patterns between inputs such as vehicle speed and altitude and output such as NOx emission are included. Applying a simple neural network has produced promising results and is a first step towards developing predictive applications.Item Enhancing controlled and uniform degradation of Fe by incorporating Mg and Zn aimed for bio-degradable material applications(Elsevier, 2022-06-01) Maruf, Mahbub Alam; Noor-A-Alam, Mohammed; Haider, Waseem; Shabib, Ishraq; IUPUC Mechanical EngineeringIn this study, combinatorial development of three nanostructured thin film systems, i.e., Fe87Mg9Zn4 (FMZ-1), Fe74Mg19Zn7 (FMZ-2), and Fe60Mg30Zn10 (FMZ-3), are employed via magnetron sputtering and their degradation pattern is studied in Phosphate Buffered Saline (PBS) solution. Controlled and uniform degradation of Fe is observed with the addition of Mg and Zn, which are crucial for temporary biodegradable implants. The structural characterization of the three samples demonstrates a crystalline structure of Fe87Mg9Zn4, a partially amorphous structure of Fe74Mg19Zn7, and a substitutional solid solution of bcc-Fe-Mg in Fe60Mg30Zn10 sample. Potentiodynamic polarization test reveals higher degradation tendency with the addition of Mg and Zn in the samples compared to pure Fe, as validated by more negative corrosion potentials and higher corrosion current densities. Samples with higher Mg and Zn contents (FMZ-2 and FMZ-3) exhibiting lower charge transfer resistance, as extracted from electrochemical impedance spectroscopy (EIS), also indicates higher corrosion rate compared to Pure Fe. Time-dependent EIS demonstrates gradual decrease in impedance values, representing controlled degradation of the samples upon exposure in PBS solution. Scanning Electron Microscopy (SEM) confirms uniform degradation pattern of FMZ-2 and FMZ-3 samples compared to FMZ-1 after 12 h and 24 h immersion in PBS solution. Finally, the X-ray Photoelectron Spectroscopy (XPS) depicts the formation of oxides, hydroxides, and phosphates of Fe, Mg, and Zn as corrosion products. The higher degradation tendency of the co-sputtered samples is ascribed to the combined role of chemical composition and non-equilibrium nanostructures.