SLTC e-Repository

The SLTC e-Repository is a digital platform designed to store, manage, and provide access to academic and research outputs of the Sri Lanka Technology Campus. It serves as a central hub for theses, dissertations, research papers, and other scholarly content produced by students and faculty.

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Recent Submissions

Fabrication of ZnO Nanowires Using Chemical Bath Deposition at Different pH Levels for High Performance Humidity Sensors
(Sri Lanka Technology Campus, 2024) Randiligama,H.M.S.P; Karunarathne,M.I.; Gunawardhana,N.; Sekar,C.
Zinc oxide (ZnO) nanowires (NWs) are promising for humidity sensing due to their high surface area, semiconducting properties, and ease of integration into electronic systems, with applications across fields like healthcare, agriculture, and semiconductor manufacturing. Effective humidity sensors require high sensitivity, fast response, and thermal stability, and Chemical Bath Deposition (CBD) offers a scalable method to synthesize ZnO NWs with controlled structural and morphological characteristics. This study investigates the impact of bath solution pH on the structural, morphological, and humidity-sensing properties of ZnO nanowires (NWs). Synthesized on a seed layer via Jet Nebulizer Spray Pyrolysis, ZnO NWs were produced with pH levels ranging from 4 to 10. Characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-visible spectroscopy, were employed to analyze the nanowires. The results reveal how pH influences the properties of ZnO NWs, providing critical insights for enhancing their applications in humidity sensing.
Six-Key ASCII-Braille Converter with Real-Time Audio and Tactile Feedback for Visually Impaired Communities
(Sri Lanka Technology Campus, 2024-11) Akshana, A.; Perera, C.N.; Karunarathne, S.M.M.L; Jayasinghe, D.C.V.
This research introduces an innovative assistive technology aimed at enhancing communication for visually impaired people in Sri Lanka, particularly those who speak Sinhala and Tamil. The system addresses unique challenges, such as limited accessibility in existing communication tools for these languages. It integrates a six-key ASCII-Braille converter keyboard with a web application that provides tactile and audio feedback for real-time interaction. Users can efficiently input text, which is converted into ASCII-Braille characters for tactile reading. A servo motor automates the interaction with Braille cells, enhancing tactile output. The web application, built with Django and integrated with WebSockets, facilitates real-time communication through instant messaging and group chats, supporting Sinhala and Tamil languages. Additionally, the system utilizes Google Text-to-Speech for auditory feedback, promoting inclusivity for both visually impaired and sighted users. To improve efficiency, Huffman coding is applied to compress data by selecting 10 representative letters from each language, achieving 99% efficiency for Sinhala and 85% for Tamil. Wireshark analysis revealed a delay of approximately 1.32 seconds for input processing, with a minimal delay of 0.0003 seconds for message transmission, highlighting areas for enhancement to improve system responsiveness.
Effect of Different Organic Manures and Organic NPK on Growth and Yield of Radish (Raphanus sativus L.)
(Sri Lanka Technology Campus, 2024-11) Karunarathna,Amanda; Vibodhani,D.D.N.; Rathnayaka,R.M.S.M.B.
This research investigates the influence of different organic manures and an organic NPK mixture on the growth and yield of radish (Raphanus sativus L.). Radishes are known for their nutritional benefits and are widely consumed across the globe. However, the use of synthetic fertilizers has led to concerns regarding soil health and environmental sustainability. This study was conducted to explore organic alternatives and develop sustainable cultivation practices. The experiment was designed using a randomized complete block design (RCBD) with seven treatments, including a control, and five replications. The treatments include compost, paddy compost, bonemeal, neem cake, vermicompost, and rice husk charcoal, combined with an organic NPK mixture made from dry tea dust, eggshell dust, and banana peels. Data were collected on various growth parameters, including plant height, leaf size, and root length, as well as yield parameters such as total biomass and fresh root weight. The results demonstrated that rice husk charcoal (T6) led to the highest yield and plant growth, whereas neem cake (T4) exhibited the lowest results. The research findings emphasize the potential of organic manures, particularly rice husk charcoal, combined with organic NPK, to enhance radish cultivation, offering insights into eco-friendly farming practices. Future studies are recommended to investigate the long-term effects on soil health and expand to other crops.
An Assessment of Carbon Sequestration and Biodiversity using the Shannon-Weiner Index of Trees for Sustainable Urban Campus Management: A Case Study at Sri Lanka Technology Campus
(Sri Lanka Technology Campus, 2024-11) Jayasinghe, R.N.K.; Wijayasenarathne,K.A.S.H.; Nethshan,H.P.; Dilini,R.M.A; Bandara,I.A.S.H.; Thisaranga,K.D.M.S.; Harendra,H.D.C.M.
This study evaluates the carbon sequestration potential of tree species within the Sri Lanka Technology Campus (SLTC) to identify high-performing species and support the university's sustainability objectives. Carbon sequestration is vital for climate change mitigation, especially in semi-urban environments. The study involved a comprehensive inventory of 429 trees across 49 species. Measurements included Diameter at Breast Height (DBH), height, and biomass, followed by aboveground and belowground biomass calculations, dry weight, and carbon content. The Shannon-Weiner Index was employed to estimate biodiversity. The findings revealed that Alstonia macrophylla (Devil Tree), Mangifera indica (Mango), and Azadirachta indica (Neem) are the dominant species. However, Kigelia africana and Acacia lebbeck emerged as the most efficient species regarding carbon sequestration potential. The campus trees collectively sequestered approximately 442.9 tons of carbon. The presence of exotic species, such as Alstonia macrophylla, suggests a decline in native biodiversity, indicating the need for restoration. This research provides a framework for enhancing carbon sequestration through strategic species selection, supporting SLTC's role in climate change mitigation, and contributing to Sri Lanka's broader environmental goals. These findings also highlight the importance of regular tree monitoring and biodiversity promotion to maximize long-term carbon sequestration benefits.
Effect of film thickness on characteristic properties of thermally evaporated copper oxide thin films
(Sri Lanka Technology Campus, 2024-11) Bandara,T.M.W.J.; Heenatikumbura,R.W.M.K.; Bandara,K.M.N.S
Copper oxide (CuO) is regarded as one of the most promising materials for heterojunction solar cells. Due to its bandgap (~1.2 eV), CuO thin films have been used as the absorber material for the development of photonic devices. In this study, CuO thin films were deposited on the cleaned FTO glass substrates by varying the deposition duration in order to vary layer thicknesses using the thermal evaporation technique (PVD). The chamber pressure was maintained at 1.5 ×10 -5 Torr. Morphological and optical properties of the synthesized films were studied as a function of the film thickness. Scanning electron microscopy and UV–Vis spectroscopy were used to explore the morphology and optical properties of the films, respectively. Field emission scanning electron microscopy (FESEM) analysis revealed formation of nanoparticles with sizes in between 77.78 nm to 102.94 nm. Morphological studies have revealed that the uniformity of the film surface, and the average Nano particle diameter were found to increase with sample thickness increase. The bandgap was estimated from optical absorption measurements. The calculated bandgap value of copper oxide thin films increases from 1.78 eV to 2.78 eV when film thickness decreases. The lowest bandgap value was reported for the sample thickness at 50 nm. Moreover, the optical properties such as the bandgap energy of CuO were found to be influenced by the sample thickness. The study uncover method.