http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/5679 2026-04-06T12:44:39Z 2026-04-06T12:44:39Z Faculty of Medicine, University of Jaffna http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/9609 2023-07-11T05:39:11Z 2023-01-01T00:00:00Z

Proceedings of the 6th Undergraduate Research Symposium 2023 Faculty of Medicine, University of Jaffna

2023-01-01T00:00:00Z Mirudula, S. Jeyaram, S. Loheeswaran, S. http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/8918 2023-01-24T04:21:37Z 2022-01-01T00:00:00Z

Voice controlled automatic hand sanitizer dispenser with thermometer Mirudula, S.; Jeyaram, S.; Loheeswaran, S. Recent days, the whole world is struggling with COVID-19 pandemic. As one of the preventive measures, people’s body temperatures are measured and hands are sanitized while they enter into most of the organizations. Usually this is manually performed by security personals. Since nowadays we have to fight with Omicron which is the new variant of COVID 19 and highly transmissible, it is better to perform the temperature screening and sanitizing by reducing or without human-human interaction. This is the main motivation and scope of this project. Many automatic hand sanitizing devices are available at the market at present, but the novelty of this project is voice enabling feature with low cost. The system welcomes the person and instructs him to measure his body temperature by voice while he is entering. Then it measures the body temperature and displays as well as reads out the measured temperature. If the person’s body temperature is within the allowable range, then it will dispense the hand sanitizer, else it will instruct him to go for manual screening. The circuit for the system comprises an Arduino microcontroller, OLED display, relay module, ultrasonic sensors, temperature sensor, 5 V DC pump, LED lights, audio modulator and speaker. The temperature sensor (MLX90614) senses the body temperature. Microcontroller verifies that the value is within the specified range as controlled by its ultrasonic sensor and displays the temperature on the OLED display and voice play also. Thereafter, the relay module controls the 5 V DC pump to dispense the sanitizer. The language of the voice can be set according to the user’s preference. The device helps to maintain personal preventive measures as well as detecting a possible symptomatic person, since fever with high temperature is one of the major symptoms of COVID-19. The device has been tested and ensured its working effectiveness. It will be very useful for any organization even with more buildings/sections. It can be positioned at the entrance of the buildings for temperature screening and hand sanitize all the staff and visitors against COVID-19.

2022-01-01T00:00:00Z Senevirathna, H.M.C.U. http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/8917 2023-01-24T04:19:50Z 2022-01-01T00:00:00Z

Natural dyes extracted from Catharanthus flower petals for dye-sensitized solar cells application Senevirathna, H.M.C.U. Dye-Sensitized Solar Cells (DSSCs) are one of the most studied cost-efficient solar cells with commercially available Ru-based dyes as the photosensitizer[1]. There has been a considerable interest to utilise natural dyes due to being environmentally friendly and economically superior to the commercially available Ru-based dyes [2]. This study focuses on utilising natural dyes extracted from Catharanthus flower petals as a photosensitizer for fabricating TiO2 based DSSC. Fresh flower petals were washed with deionized water before drying them to make a powder sample. Dyes were then extracted by soaking the power with ethanol and DI-water. The UV-Visible spectroscopy study reveals the presence of Chlorophyll and Anthocyanin in the ethanol extract. However, no distinguished peaks were observed for the dye-coated TiO2 films due to the interference of the TiO2 absorbance. Moreover, the uniform distribution of the dye molecules in the dye-coated TiO2 films was confirmed by the AFM study. DSSCs were then fabricated by doctor-blade method with the effective area of 0.25 cm2 utilising natural dye, 𝐼 − / 𝐼3 − redox couple and Pt electrode as a sensitizer, electrolyte and counter electrode, respectively. Finally, the photovoltaic performance of the fabricated devices was investigated under simulated irradiation of intensity 100 mW/cm2 with AM 1.5 filter. The device with ethanol extract of Catharanthus flower sensitized photoanode pronounced photovoltaic properties with short circuit current density, open circuit voltage and fill factor, 0.39 mAcm-2 , 0.56 V and 0.50, respectively.

2022-01-01T00:00:00Z Gunasekara, M.S.S. Thivakarasarma, T. Dhayalan, V. Ravirajan, P. http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/8916 2023-01-24T04:18:06Z 2022-01-01T00:00:00Z

Influence of post-annealing temperature on the properties of thermally evaporated CuI thin film Gunasekara, M.S.S.; Thivakarasarma, T.; Dhayalan, V.; Ravirajan, P. Copper Iodide (CuI) has been widely used in various optoelectronic applications including solar cells, light-emitting diodes owing to the high hole mobility, high electrical conductivity, wide direct bandgap, high transparency, and high chemical stability. In this work, the effect of the post-annealing treatment on the structural, optical, and electrical properties of the thermally evaporated CuI thin film (100 nm) was investigated by using X-ray diffraction (XRD), UV visible spectrometer, and four-point probe method, respectively. The prepared films were annealed in air at different temperatures from 50°C to 300 °C. XRD pattern of CuI film well matched with standard values and no phase change was observed with the heat treatment. The heat-treated CuI films have a lattice parameter decrease from 6.06Å to 6.03Å due to the decrement of unit cell volume. An optical band gap was found in the range of 2.98 -3.00 eV. Therefore, thermally evaporated CuI films are optically stable in the temperature range of 50 - 300°C. And the electrical resistivity of thermally evaporated CuI film was found at 0.20 Ωcm. The study suggests that changing the annealing temperature as a post deposition treatment affects structural, optical, and electrical properties of thermally evaporated CuI films slightly. These results indicate that thermally evaporated p-type CuI film is stable and is promising hole-transporting material for opto-electronic devices.

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