http://dr.lib.sjp.ac.lk/handle/123456789/11824 2026-04-23T10:15:23Z http://dr.lib.sjp.ac.lk/handle/123456789/11829 The Fight against the COVID-19 Pandemic with 5G Technologies Siriwardhana, Y.; de Alwis, C.; Ylianttila, M.; Liyanage, M. The COVID-19 pandemic has affected the world in an unexpected manner. The human race is battling against the pandemic while schools, universities, industries, hospitals and governments are seeking new methods and technologies to seamlessly continue their usual operations. In response, this paper presents how 5G and IoT (Internet of Things) related technologies can be efficiently utilized and developed to fight against the COVID-19 pandemic. Several use-cases on how 5G and IoT can be enablers to provide innovative solutions in the areas of telehealth, contact tracing, education, retail and supply chains, e-government/ remote office/ information sharing, smart manufacturing and factory automation, e-tourism and entertainment are presented along with their technical requirements and challenges. It is envisaged that the proposed solutions will be instrumental to facilitate the usual lifestyle, work and other dayto-day activities of humans in the post-pandemic world. 2020-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/11828 On the status and mechanisms of coastal erosion in Marawila beach, Sri Lanka Rathnayakage, S.M.S.; Sasaki, J.; Suzuki, T.; Jayarathne, R.; Ranawaka, R.A.S. 2020-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/11827 Fire performance of cold, warm and hybrid LSF wall panels using numerical studies Perera, D.; Poologanathan, K.; Nanayakkara, S.M.A.; Konthesingha, K.M.C. Robust and pre-fabrication construction techniques are the cutting edge practice in the building industry. Coldframe, warm-frame and hybrid-frame are three common Light-gauge Steel Frame (LSF) wall constructions applied for better energy performance. Still, the applications of the aforementioned wall configurations are restricted due to limited fire safety studies. This paper presents the fire performance investigations and results of cold-frame, warm-frame, and hybrid-frame LSF walls together with three novel configurations maintaining the same material quantities. Successfully validated 3D heat transfer finite element models were extended to six wall configurations. Time variant temperature profiles from Finite Element Analyses were evaluated against the established Load Ratio (LR)-Hot-Flange (HF) temperature curve to determine the structural fire resistance. Modified warm-frame construction showed the best performance where the Fire Resistance Level (FRL) is approximately twice that of conventional LSF wall configurations. Hence, the novel LSF wall configurations obtained by shifting the insulation material toward the fireside of the wall make efficient fire-resistant wall solutions and the new designs are proposed to be incorporated in modular constructions for enhanced fire performance. 2020-01-01T00:00:00Z http://dr.lib.sjp.ac.lk/handle/123456789/11826 Optimizing Blending of Manufactured Sand with Offshore Sand Based on Physical and Virtue Characteristics Branavan, A.; Konthesingha, K.M.C.; Nanayakkara, S.M.A.; Premasir, H.M.R Usage of alternative fine aggregates in concrete and cement mortar has been gradually increasing by the construction industries around the world due to the escalated shortage in obtaining natural river sand. Manufactured sand and offshore sand can be considered as the principal alternatives which are consumed by most of the contractors for substituting river sand in the construction activities now. However, most of the above sand consumptions are done without deeply analyzing the conformity of the alternatives to concrete and cement mortar. The present study is executed to inspect the fitness of manufactured sand from two different high-grade metamorphic rocks, offshore sand, and blended sands of both manufactured sand types at 25%, 50% and 75% replacement levels with offshore sand to be practiced in concrete and cement mortar by scrutinizing physical properties and quality through series of characterizing experiments. Results reveal that blended sand with all replacement levels can be suitable with respect to particle characteristics such as angularity, surface texture and total specific surface. Regarding resultant particle size distribution, blended sands with 50% replacement level can be the optimum solution in reference to uniform gradation, the density of sand mix, and fineness. 50% and 75% contents of manufactured sand in combined sand types show higher loose and packing densities than river sand. Flowability under the gravity of blended sand types contain 50% to 75% of offshore sand are performed well contemplating different affecting parameters. However, increased manufactured sand content demands more water than river sand and offshore sand. Additionally, hazardous materials such as clay lumps and friable particles, fines and silt are identified within the permissible range based on the requirements by the standard available. Regarding all the above characteristics, blended sands contain two manufactured sand types with 50% replacement level with offshore sand can be suggested as the optimum substitution for river sand in terms of fresh and hardened state properties of concrete and cement mortar. 2020-01-01T00:00:00Z