Memorial University Research Repository

The Memorial University Research Repository is an open access initiative to showcase and preserve Memorial University's creative and intellectual output, including theses, journal articles, conference papers, lectures, presentations, reports, and performances.

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Faculty of Business Administration 12
Faculty of Education 97
Faculty of Engineering and Applied Science 311
Faculty of Humanities and Social Sciences 259
Faculty of Medicine 314
Faculty of Nursing 14
Faculty of Science 835
Grenfell Campus 322
Labrador Campus 4
Marine Institute 143
Memorial Theses 11415
Memorial University Affiliates 95
Memorial University Libraries 145
School of Human Kinetics and Recreation 11
School of Music 14
School of Pharmacy 16
School of Social Work 8
Specialized Centres 334

Recent Submissions

Access status: Open Access ,
Using Heritage Materials to Inspire New Understanding in Solid State Chemistry
(ACS Publictions, 2024-09-06) Oertel, Catherine M.; Poduska, Kristin M.
Research problems stemming from investigating or conserving cultural heritage objects can provide a test bed for advancing our collective understanding of complex and dynamic materials, as well as inspiring discovery of new materials families. The key is in recognizing changes that can happen to a material over time scales of years to millennia, due to the environment in which it exists; these kinds of investigations are very under-represented in the field of solid state chemistry. We illustrate this opportunity using examples from our own and others’ work on the long-term alterations of carbonates and complex oxides. In doing so, we emphasize the mutual benefit between synthetic and materials characterization strategies of solid state chemistry and research questions in the field of heritage materials.
Access status: Open Access ,
Monitoring and Control of a Remote Hybrid Powered Reverse Osmosis Unit for McCallum, NL
(Universal Wiser, 2025-10-31) Kafrashi, Fatemeh; Golchin, Hani; Iqbal, Tariq
This study presents the design and implementation of a low-cost, fully offline Supervisory Control and Data Acquisition (SCADA) system for monitoring and controlling a Reverse Osmosis (RO) water treatment unit powered by a Hybrid Energy System (HES) in the remote community of McCallum, Newfoundland and Labrador. The HES comprising PV panels, a wind turbine, batteries, and a DC diesel generator was designed and validated in prior work. To address the lack of Internet and cellular connectivity, the proposed system combines Long-Range (LoRa) communication with a local Message Queuing Telemetry Transport (MQTT) broker to facilitate real-time monitoring and bidirectional control. Two ESP32 LoRa modules form the hardware backbone, enabling wireless data transmission and control across a 400-meter range. Sensor data is visualized through FUXA, an open-source, web-based SCADA platform hosted locally. The system also provides audible alerts for fault conditions. Seven operational scenarios were tested to evaluate system performance, confirming reliable data acquisition, robust wireless communication, and effective remote actuation. Lab tests showed average end-to-end latency of 200–300 ms, zero packet loss in line-of-sight conditions, and a field-unit power demand of ~21–22 Wh/day. The modular architecture supports scaling to multiple RO units or larger communities without requiring Internet connectivity. The proposed architecture offers a scalable, energy-efficient, and Internet-independent SCADA solution for critical infrastructure in disconnected and resource-limited environments.
Access status: Open Access ,
Dynamic Simulation of a Hybrid Energy System for Powering a Water Treatment Facility in McCallum, Newfoundland and Labrador
(European Open Science, 2024-12-31) Kafrashi, Fatemeh; Iqbal, Tariq
Clean water, a basic human need, is in short supply in McCallum, Newfoundland and Labrador, primarily due to lead contamination, forcing residents to rely on collected rainwater. Reverse Osmosis (RO) has been identified as the most suitable desalination method because of its lower energy requirements and high effectiveness in treating lead-contaminated water. Powering the RO system with renewable energy sources (RES) offers a promising solution for this remote, off-grid area, currently powered by a diesel generator. The proposed hybrid energy system (HES) provides not only the most economically optimal configuration but also greater reliability. The system consists of a 3.6 kW solar array, a 2-kW wind turbine, a 3-kW DC diesel generator, and a 680 Ah 48 V battery bank to supply the single-phase water treatment system, which includes a 0.3 kW resistive load, lighting, and two asynchronous machines rated at 0.5 hp and 0.75 hp, respectively. A dynamic simulation of the proposed system, based on calculation done in Kafrashi and Iqbal [1], is presented in this paper. All system components are modeled in MATLAB/Simulink. Simulation results show expected dynamics in the system. Results indicate proper system operation with reasonable within-range system voltage and current during normal operation.
Access status: Open Access ,
Accessible ocean monitoring technologies in developing countries: NF-POGO global scholar perspectives on low-cost solutions
(Fisheries and Marine Institute, 2025-06) Mullan, Sean
Access status: Open Access ,
Advancing Arctic marine monitoring through optical technologies and collaborative partnerships
(Fisheries and Marine Institute, 2025-06) Forbes, Rachel A.S.; Fisher, Jonathon A. D.