DSpace Collection:http://ir.lib.seu.ac.lk/handle/123456789/51702024-03-29T14:54:12Z2024-03-29T14:54:12ZEffect of carbon dioxide on emission Economic growth, energy consumption and Population growth in SAARC CountriesDe Zoysa, G.I.C.L.Jahufer, A.http://ir.lib.seu.ac.lk/handle/123456789/52062021-10-18T19:31:31Z2020-09-25T00:00:00ZTitle: Effect of carbon dioxide on emission Economic growth, energy consumption and Population growth in SAARC Countries
Authors: De Zoysa, G.I.C.L.; Jahufer, A.
Abstract: This study examines the impact of carbon dioxide emission on economic growth,energy consumption and population growth in SAARC countries such as Sri Lanka,India, Bangladesh, Pakistan and Nepal countries by using an annual time series data collected from World Development Indicator from 1971 to 2018. Autoregressive Distributed Lag (ARDL) bounds test approach was used for employing both linear and non-linear relationships between variables. The test results reveal that carbon dioxide emissions have increased significantly with increases in economic growth in Nepal and Pakistan as well as it has decreased insignificantly in Sri Lanka and Bangladesh. But in India, carbon dioxide emission has decreased insignificantly with economic growth. Also, in the case of energy consumption had a positive significant impact on carbon dioxide emissions in Sri Lanka, Bangladesh, India and Pakistan but Nepal had a positive insignificant impact on carbon dioxide emissions. Furthermore, carbon dioxide emissions have increased significantly with population growth only in Pakistan as well as Bangladesh, Indian and Nepal had positive insignificant impact on carbon dioxide emissions. In the case of Sri Lanka, carbon dioxide emissions have decreased insignificantly with increases in population growth. Results from the testing of Environmental Kuznets curve hypothesis (EKC) imply that in the case of India and Pakistan, carbon dioxide emissions will decrease over time with economic growth indicating that these two countries should not make immediate corrective actions and policies against carbon dioxide emissions but in the case of Sri Lanka, Bangladesh and Nepal, carbon dioxide emissions will increase over time with economic growth. So, these three countries should take immediate corrective actions and policies against carbon dioxide emissions.2020-09-25T00:00:00ZMechanical properties of compounded Natural latex/ graphite compositesViyanage, M.P.Manage, T.R.T.De Silva, R.C.L.Nayanajith, L.D.C.Samarawickrama, D.S.Jafeen, M.J.M.Kottegoda, I.R.M.http://ir.lib.seu.ac.lk/handle/123456789/52052021-10-18T19:31:31Z2020-11-25T00:00:00ZTitle: Mechanical properties of compounded Natural latex/ graphite composites
Authors: Viyanage, M.P.; Manage, T.R.T.; De Silva, R.C.L.; Nayanajith, L.D.C.; Samarawickrama, D.S.; Jafeen, M.J.M.; Kottegoda, I.R.M.
Abstract: Attempts were made to investigate the mechanical properties of compounded natural latex / natural graphite composites. Compounded natural latex was used to prepare the composites. Different composites were prepared by changing the graphite percentage in compounded latex. All the composites were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). The mechanical properties of all composite were tested according to the standard method. The tensile strength of the compounded natural rubber graphite composite was increased up to 60% of graphite addition in rubber. The Young’s moduli of composites were found to be improved. High hardness of the compounded natural rubber graphite composite was observed at 60% of graphite. The properties of compounded natural latex
/graphite investigate in the present study will be useful for many applications including electronic devices, automobiles, toys, heavy equipment industry, battery box, consumer products etc.2020-11-25T00:00:00ZElectrochemical behavior of ppy(dbs) films in 𝐁𝐚𝐂𝐥𝟐 electrolytesFarhan, M.S.M.Jafeen, M.J.M.http://ir.lib.seu.ac.lk/handle/123456789/52042021-10-18T19:31:32Z2020-10-25T00:00:00ZTitle: Electrochemical behavior of ppy(dbs) films in 𝐁𝐚𝐂𝐥𝟐 electrolytes
Authors: Farhan, M.S.M.; Jafeen, M.J.M.
Abstract: Conducting polymers (CPs) are unusual organic materials featuring high electronic
conductivity. Among them, some of these polymers can change their volume considerably when their redox state is altered in aqueous electrolytes. This property is exploited for the use as artificial muscles or soft actuators. The actuation property of CPs highly depends on cycling electrolytes, types and concentrations. The present work aims to explore the possibilities to use Polypyrrole, doped with the immobile anion dodecyl benzene sulfonate
(PPy/DBS) films cycled in BaCl2 electrolytes. In this study, PPy(DBS) films of thickness 400 nm were electro polymerized on 6 MHz AT-cut quartz crystal electrodes from synthesized solution containing 0.05 M pyrrole monomer in 0.05 M NaDBS solution and characterized by simultaneous cyclic voltammetry and Electrochemical Quartz Crystal Microbalance measurements(EQCM). The films were cycled in 0.1 M BaCl2 and 1 M BaCl2 electrolytes. When comparing with high and low concentrations of BaCl2, a larger frequency change was obtained in low concentrations rather than in higher concentration, indicating that the actuation in thin concentrations is larger than higher.2020-10-25T00:00:00ZUpgrading ilmenite to synthetic rutile by ball milling induced sulphurisation reduction using commercial sulphurSubasinghe, H.C.S.Ratnayake, A.S.http://ir.lib.seu.ac.lk/handle/123456789/52032021-10-18T19:34:12Z2020-10-25T00:00:00ZTitle: Upgrading ilmenite to synthetic rutile by ball milling induced sulphurisation reduction using commercial sulphur
Authors: Subasinghe, H.C.S.; Ratnayake, A.S.
Abstract: An efficient examination of the impact of processing time on sulphurisation of ilmenite was completed by a blend of mechanical activation and isothermal annealing. In this study, the ball milling induced sulphurisation was identified using X-ray diffraction (XRD), X-ray fluorescence (XRF), and particle size analysis. Initial ilmenite was characterized with over 95% of FeTiO3, ~2% of SiO2, ~1% of Al2O3 and the rest compensated by other minor oxides. Ilmenite was mixed with commercial sulphur in three ratios by weight as 1:1, 2:1 and 4:1. These mixtures were separately milled for 4 and 6 hours each. The particle sizes of ilmenite/sulphur mixtures were highly reduced irrespective of material ratio, and all the 6 hours milled samples had a considerable percentage converted to nanoparticles. The decrease in the intensity of sulphur peaks in XRD spectra obtained after milling indicated a possible dissolution of sulphur into ilmenite structure. This designates the formation of a mixed composite structure. Pseudobrookite, pseudorutile and pyrite peaks were observed in the XRD spectra of milled samples. All the samples were isothermally annealed at 600°C, 800°C, 1000°C, and 1200°C, separately. The results obtained had similar variations in samples annealed at 800°C, 1000°C, and 1200°C. Consequently, it indicates
800°C as the effective temperature for sulphurisation of ilmenite. Each ratio produced similar results and the optimum ratio of ilmenite: sulphur was obtained at 4:1. Pseudo brookite and pseudorutile peaks were disappeared and anatase, brookite and rutile peaks appeared in the XRD spectra of the annealed samples.Further, pyrite was converted to pyrrhotite in the samples annealed at 1000°C. Consequently, pyrrhotite was converted to elemental iron and sulphur after annealing for 2 hours at 1200°C. Therefore, it was concluded that mechanical attrition applies beneficial outcome on the diminishing temperatures of ilmenite reduction. Finally, the steady deoxidizing of titanium oxides was terminated after isothermal annealing.2020-10-25T00:00:00Z