https://ir.kdu.ac.lk/handle/345/7293 2026-04-08T13:42:00Z 2026-04-08T13:42:00Z Dias, TWKIM https://ir.kdu.ac.lk/handle/345/7493 2024-03-19T05:00:06Z 2023-09-01T00:00:00Z

Barriers to pedestrian-related road crash analysis in identifying engineering countermeasures Dias, TWKIM Nonmotorized transportation is one of the trending transportation modes in a world where sustainable transportation is considered vitally important. They, being the most vulnerable road users in the road, people are not so much motivated to walk, mostly as short trips rather than for recreational walking. On average, 686 pedestrians are killed on roads in Sri Lanka per year. It is important if engineering countermeasures can be taken either to reduce the number of pedestrian crashes or to reduce the crash severity of the same. In order to do so, there needs to be sound evidence pointing at significant parameters in pedestrian crashes that can be addressed by engineering countermeasures. However, the Sri Lankan crash reporting system maintained by Sri Lanka Police has limited entries to carry out such a detailed study. Hence this paper has assessed the current crash reporting system and matched it with globally accepted minimum crash reporting criteria as well as frequently used pedestrian crash analyses around the world. The findings were limited to engineering parameters such as road geometry, the presence of road work zones, etc. Many details are not directly available, and a researcher is forced to collect data from secondary sources to map with the crash site. As a result, this paper has identified different data sources that can be used in pedestrian crash analysis other than the data directly from the Police database, and also identified missing but important data entries such as road alignment.

2023-09-01T00:00:00Z Sutharsan, ME Anoja, N https://ir.kdu.ac.lk/handle/345/7492 2024-03-19T04:52:03Z 2023-09-01T00:00:00Z

Water treatment efficiency of aerator and roughing filter in treating groundwater; A case study in Mullaitivu Sutharsan, ME; Anoja, N The paper describes an investigation into the efficiency of the water treatment process used in the Mullaitivu well field in Sri Lanka. The well field experiences significant groundwater extraction, approximately 1,440,000 liters per day, due to developments and resettlements in the area over the past decade. However, the groundwater quality does not meet the standards set in SLS 614;2013. The treatment process employed in the well field includes a fountain type aerator and vertical-flow roughing filters. The fountain type aerator has four drops with varying heights. The water then passes through four medial filter layers in the roughing filters, each with different particle sizes and layer thicknesses. To assess the effectiveness of the treatment process, water samples were collected at regular intervals of 6 hours during 72 hours continuous operatio. The samples were taken before and after aeration and after passing through the roughing filters. The selected water quality parameters tested in the study were turbidity, color, total iron, and manganese. The results showed that the treatment process using the aerator and roughing filters significantly removed color and total iron from the raw water. The removal efficiencies were found to be 84% for color and 88% for total iron. Additionally, the treated water's turbidity was well below the threshold limit of 2 NTU, the treated manganese level was below the limit of 0.1 mg/l, and the treated total iron level was below the limit of 0.3 mg/l specified in SLS 614;2013 for drinking water. Based on the findings, the paper recommends including pre-chlorination in the treatment process to enhance oxidation and increase the total iron and manganese removal efficiency. By doing so, the removal efficiency for turbidity and color will also be improved. Overall, the investigation suggests that the combination of the fountain type aerator and vertical-flow roughing filters can effectively improve the water quality in the Mullaitivu well field. The findings could be valuable for addressing the water quality challenges in the area and ensuring a safe drinking water supply for the local population.

2023-09-01T00:00:00Z Saputantri, ML Dhananjaya, GK Perera, JACA Ubeysiriwardana, UAND https://ir.kdu.ac.lk/handle/345/7491 2024-03-19T04:48:22Z 2023-09-01T00:00:00Z

Development of an automated clothesline system Saputantri, ML; Dhananjaya, GK; Perera, JACA; Ubeysiriwardana, UAND This presents the design, fabrication, and integration of various sensors and actuators to solve the problem of drying clothes outside. This design mainly aimed to overcome challenges related to unexpected rain, getting clothes in when it’s dark, and remote controlling capabilities. Traditionally, the method of drying clothes outdoors requires manpower, to put the clothes and to get them in. This causes various inconveniences to people. The proposed system addresses many of those concerns and gives positive feedback. By detecting the change in weather and darkness, this system will automatically shelter the clothes in a sheltered area ensuring the clothes are dry and undamaged. In addition, this system possesses the ability to control remotely and manually making it user-friendly. Additionally, this will help positively with domestic chores and demonstrate the advantages of using technology to overcome day-to-day activities. Further, this paper explains the detailed methodology, conceptual designs, and results.

2023-09-01T00:00:00Z Rathnayake, BMDP Ranasinghe, RMCP Rajapaksha, ERMCK https://ir.kdu.ac.lk/handle/345/7490 2024-03-19T04:43:22Z 2023-09-01T00:00:00Z

Smart gas leak management system Rathnayake, BMDP; Ranasinghe, RMCP; Rajapaksha, ERMCK Smart LP gas leakage management system is designed in a way to enhance residential safety. An intelligent system which is capable of timely detection and resulting in the best appropriate response is required as LP gas leaks pose a significant risk in households. The system utilizes two MQ-2 gas sensors positioned near the gas cylinder and the gas cooker for broad coverage. After detecting a gas leak, the system undergoes a few processes like activating an exhaust fan, opening windows for ventilation, cutting off the power supply of the whole house and a loud buzzer is triggered to alert the occupants. Moreover, the system is integrated with a mobile application via Bluetooth, allowing home users to remotely control any component in the system. More importantly the system has a notification feature, sending alerts to users’ mobile phone when there is a gas leakage. The effectiveness of the system is demonstrated by the experimental results. The research contributes to the field of smart gas leak management systems, developing residential safety and enabling dynamic gas leak detection and response mechanisms.

2023-09-01T00:00:00Z