http://repository.rjt.ac.lk/handle/123456789/3584 Sat, 11 Apr 2026 12:23:43 GMT 2026-04-11T12:23:43Z http://repository.rjt.ac.lk/handle/123456789/3606 Synthesis of Platinum(II) Complexes of a Pyridyl Azafluoranthene Ligand Perera, Sarath D. Pyridyl azafluoranthene ligand (LH, 2) was prepared by a Diels- Alder cycloaddition reaction between 2-cyanopyridine and bis(4-tertbutylphenyl)- 8H-cyclopenta[l]acenaphthylen-8-one (1). Treatment of (2) with [PtCl2(dmso)2] (dmso = dimethyl sulfoxide) in the presence of triethylamine in chloroform afforded the cyclometallated square-planar platinum(II) complex [(L)PtCl] (3) containing an anionic terdentate (C^N^N) ligand. The reaction of (2) with 0.5 equivalent of [(η3- methallyl)Pt(μ-Cl)]2 in dichloromethane and subsequent addition of NH4PF6 in methanol resulted in the formation of the salt[(η3- methallyl)Pt(2)]PF6 (4). The chloride ligand in (3) can be replaced by iodide and trifluoroacetate to yield [(L)PtI] (5) and [(L)PtO2CCF3] (6), respectively. Treatment of (3) with HC≡CC6H4But-4 in the presence of triethylamine and CuI yielded the acetylide [(L)PtC≡CC6H4But-4] (7). Treatment of (3) with PPh3 in dichloromethane and subsequent addition of NH4PF6 in methanol gave the salt [(L)Pt(PPh3)]PF6 (8). Similarly, the salt [(L)Pt(DMAP)]PF6 (9) was prepared by the reaction between (3) and 4-dimethylaminopyridine (DMAP). All the complexes were characterized by elemental analysis, IR, Mass and NMR spectroscopy Tue, 01 Jun 2021 00:00:00 GMT http://repository.rjt.ac.lk/handle/123456789/3606 2021-06-01T00:00:00Z http://repository.rjt.ac.lk/handle/123456789/3605 Performance Assessment of Iranamadu Irrigated Agricultural System in Sri Lanka Thusyanthini, R.; Pathmarajah, S.; Suthakaran, N. Prime portion of the agricultural sector in Kilinochchi depends on the Iranaimadu tank. Which was rehabilitated in 2017 to increase the capacity, land and water productivity and strengthen farmer organisations (FOs) . The objectives of this study were to assess the performance of Iranamadu irrigation system in terms of service delivery, land and water productivity, analyse the performance gaps between pre and post rehabilitation of the scheme and find out the crop preference of farmers who were neither major nor minor irrigation scheme. (completely depend on rain fed cultivation and agro well) Primary and secondary data were collected. Priramantharanu GN division also was selected purposively for focus group discussion (FGDs) using participatory rural appraisal (PRA). There were 21 farmer organizations (FOs), and performance of 50% FOs was below average. However, there were 30% women in the FOs. Cultivated extent of paddy increased by 20%. Cropping intensity improved 142% to 165%. Paddy productivity increased 4200kg/ha to 5100kg/ha and 5200kg/ha to 5700 kg/ha in Maha and Yala seasons respectively. Productivities of newly introduced OFCs were, cowpea, green gram, black gram, maize and groundnut were 1,000 kg/ha, 1,200 kg/ha, 1,000 kg/ha, 4,000 kg/ha, 2,000 kg/ha respectively. During Maha season, irrigation duty to the field dropped 16,775 m3/ha to 15,850 m3 /ha while, declined 22,510 m3/ha to 14,803 m3/ha during Yala season. Cost sharing of operation and maintenance went up from Rs.500/ha/yr to Rs.750/ha/yr. Essentially, there is a potential to increase the overall performance of the scheme. Farmers preferred neither minor nor major irrigation scheme to cultivate (ranked1) paddy but water was a major crisis for zero cultivation during Yala season. Tue, 01 Jun 2021 00:00:00 GMT http://repository.rjt.ac.lk/handle/123456789/3605 2021-06-01T00:00:00Z http://repository.rjt.ac.lk/handle/123456789/3604 Meteorological Factors Affecting the Prediction of the Number of Dengue Cases Reported in Anuradhapura District De Silva, S.H.M.P.; Nawarathna, Lakshika S. Dengue fever is a mosquito-borne viral infection rapidly spreading in the world by the vector Aedes aegypti mosquito. Day by day, new dengue cases are reported in Sri Lanka, and hence the risk of dengue exists throughout the country. Besides, the lowest amount of dengue cases in Sri Lanka was reported from the North Central province. Thus, this study focuses on the Anuradhapura district, the capital of the North Central Province. The main objectives of this study are to identify the weather factors affecting the number of dengue cases, investigate the variability and trends of reported dengue cases, identify the correlation between the number of dengue cases and weather factors reported in the Anuradhapura district. The weather data from 2010-2019 was collected from the Department of Meteorology-Sri Lanka, and the dengue cases data was collected from the Epidemiology Unit of the Ministry of Health. Bar charts, pie charts, line graphs and time series plots were used to visualize the data. The normality assumption of the data was checked using Anderson-Darling normality tests. Moreover, Pearson correlation tests were used to check the correlations between variables. The number of dengue cases and the rainfall were forecast for the upcoming years using a trend analysis method. Stepwise regression analysis was performed to identify the weather factors affecting the number of dengue cases and Akaike Information Criterion (AIC) values were used to select the best model. Further, Mean Absolute Percentage Error (MAPE) values were calculated to find the prediction accuracy of the proposed models Tue, 01 Jun 2021 00:00:00 GMT http://repository.rjt.ac.lk/handle/123456789/3604 2021-06-01T00:00:00Z http://repository.rjt.ac.lk/handle/123456789/3603 Impact of Gratification Factors on User Satisfaction of Hotels’ Facebook Pages and Their Visit Intention Madhuwanthi, P.V.I.; Dinesha, P.K.C. The purpose of this study is to examine the impact of gratification factors that increase user satisfaction of hotels’ Facebook pages and to determine how user satisfaction affects visit intention of a hotel by applying the Uses and Gratifications (U&G) theory factors (e.g. five motivational factors of information, convenience, entertainment, self-expression and social interaction). Social Network Sites (SNS) have become one of the most popular ways people use to communicate with each other and among them Facebook has acquired a prominent place. Frequently, Businesses and Customers also tend to use SNSs respectively to promote their brands and search information regarding products and services. Currently social media has a strong presence in the hotel industry and especially Facebook pages can be identified as very popular marketing tool they used. As per the previous studies revealed there is an important research area to investigate whether there is an impact of gratification factors on user satisfaction with the hotel’s Facebook pages and whether there is a positive relationship between user satisfaction with a hotel’s Facebook page and intention to visit hotels in Sri Lankan context. This study conducted, as a quantitative study and it extracted data through a questionnaire by using 100 Facebook users who are engaging with the Facebook pages of targeted hotels’ in Sri Lankan context. Accordingly, findings, information, entertainment and self-expression are positively impacted on hotel page user satisfaction and user satisfaction also has positive impact on hotel visit intention. Tue, 01 Jun 2021 00:00:00 GMT http://repository.rjt.ac.lk/handle/123456789/3603 2021-06-01T00:00:00Z