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Champika Bandara,Anusha Gayan Atthanagoda,Nadeesha Lewke Bandara,Pankaj Kumar 국립중앙과학관 2024 Journal of Asia-Pacific Biodiversity Vol.17 No.1
Habenaria reniformis (D.Don) Hook.f. and Liparis deflexa Hook.f. (Orchidaceae), known to be widespreadin south and south-east Asia, are now reported here for the first time from Sri Lanka. Detailed taxonomicdescriptions on Sri Lankan specimens, information on type, line drawings, notes on habitats, ecology,updated global distribution, and conservation status of these species for Sri Lanka are provided. The totalnumber of the species of family Orchidaceae in Sri Lanka now stands at 199 species with these twoadditions.
Efficacy of woody biomass and biochar for alleviating heavy metal bioavailability in serpentine soil
Bandara, T.,Herath, I.,Kumarathilaka, P.,Hseu, Z. Y.,Ok, Y. S.,Vithanage, M. Springer Science + Business Media 2017 Environmental geochemistry and health Vol.39 No.2
<P>Crops grown in metal-rich serpentine soils are vulnerable to phytotoxicity. In this study, Gliricidia sepium (Jacq.) biomass and woody biochar were examined as amendments on heavy metal immobilization in a serpentine soil. Woody biochar was produced by slow pyrolysis of Gliricidia sepium (Jacq.) biomass at 300 and 500 A degrees C. A pot experiment was conducted for 6 weeks with tomato (Lycopersicon esculentum L.) at biochar application rates of 0, 22, 55 and 110 t ha(-1). The CaCl2 and sequential extractions were adopted to assess metal bioavailability and fractionation. Six weeks after germination, plants cultivated on the control could not survive, while all the plants were grown normally on the soils amended with biochars. The most effective treatment for metal immobilization was BC500-110 as indicated by the immobilization efficiencies for Ni, Mn and Cr that were 68, 92 and 42 %, respectively, compared to the control. Biochar produced at 500 A degrees C and at high application rates immobilized heavy metals significantly. Improvements in plant growth in biochar-amended soil were related to decreasing in metal toxicity as a consequence of metal immobilization through strong sorption due to high surface area and functional groups.</P>
Bandara, Sooriya,Ryoo, Dong-Keun,Ahn, Ki-Myung Korean Institute of Navigation and Port Research 2018 한국항해항만학회지 Vol.42 No.5
Colombo noticeably became the most economical gateway to the Indian subcontinent, in terms of cost as well as time. The Colombo Port Expansion Project (CPEP) started commencement with the purpose of accommodating mega ships, under the long-term strategies of making Colombo the hub of South Asia. In this context, the purpose of this study is to investigate the causal relationship between Indian ports' originated container traffic, and total transshipments of the port of Colombo, and also to identify the nature of the causality between the two variables, evaluating Granger causality test results. It finds unidirectional causality from total transshipments of Colombo to Indian ports' originated transshipments in the port of Colombo. It suggested that ongoing port expansion projects, opening up for new markets and attracting new shipping lines in the port of Colombo, have generated significant impact on Indian ports' container traffic, via the port of Colombo. Findings would be valuable for future forecasting of container traffic in Colombo port and the policy-making process in the port as well.
Performance Evaluation of the Screw-Type Oil Expeller for Extracting Mee (Madhuca longifolia) Oil
Bandara, D.M.S.P.,Dissanayake, C.A.K.,Dissanayake, T.M.R.,Rathanayake, H.M.A.P.,Senanayake, D.P. Korean Society for Agricultural Machinery 2016 바이오시스템공학 Vol.41 No.3
Purpose: Mee (Madhuca longifolia) is an economically important tree growing throughout Sri Lanka. Its importance is mainly attributed to its oil with high nutritional and medicinal values. However, an inefficient extraction method limits its use. This study revealed the possibility of extracting oil from mee seeds by using a screw-type oil expeller. Methods: A popular screw-type oil expeller was used in the experiment. Extract bar clearance and speeds of the main spiral shaft were altered to increase the oil expelling efficiency of the machine. The quality of refined oil at the optimum oil yield was determined by measuring the refractive index, saponification value, iodine value, unsaponifiable matter, free fatty acid, and specific gravity. Results: An optimum yield of 35% oil was obtained when the machine capacity was 30 kg/h and energy consumption was 0.13 kWh/kg. This optimum machine condition was observed at an extract bar clearance of 0.5 mm and a main spiral shaft speed of 90 rpm. The refractive index, saponification value, iodine value, unsaponifiable matter, free fatty acid, and specific gravity of the oil were 1.4, 203, 59, 3.5%, 0.2%, and 0.907 g/cm3 respectively. Color of the mee oil was closer to yellow, which is revealed by the lightness value (L) of 24.93 and positive value (b) of 11.81. Conclusion: The screw-type oil expeller can be used for economically extracting mee oil on a commercial scale.
Bandara, T.,Herath, I.,Kumarathilaka, P.,Seneviratne, M.,Seneviratne, G.,Rajakaruna, N.,Vithanage, M.,Ok, Y. S. Springer Science + Business Media 2017 Journal of soils and sediments Vol.17 No.3
<P>Results suggest that the addition of BC to serpentine soil immobilizes heavy metals and decreases soil enzymatic activities. The addition of FB to serpentine soil improves plant growth by mitigating heavy metal toxicity and enhancing soil enzymatic activities.</P>
Sooriya Bandara,류동근(Dong-Keun Ryoo),안기명)Ki-Myung Ahn) 한국항해항만학회 2018 한국항해항만학회지 Vol.42 No.5
Colombo noticeably became the most economical gateway to the Indian subcontinent, in terms of cost as well as time. The Colombo Port Expansion Project (CPEP) started commencement with the purpose of accommodating mega ships, under the long-term strategies of making Colombo the hub of South Asia. In this context, the purpose of this study is to investigate the causal relationship between Indian ports’ originated container traffic, and total transshipments of the port of Colombo, and also to identify the nature of the causality between the two variables, evaluating Granger causality test results. It finds unidirectional causality from total transshipments of Colombo to Indian ports’ originated transshipments in the port of Colombo. It suggested that ongoing port expansion projects, opening up for new markets and attracting new shipping lines in the port of Colombo, have generated significant impact on Indian ports’ container traffic, via the port of Colombo. Findings would be valuable for future forecasting of container traffic in Colombo port and the policy-making process in the port as well.
Electrochemical double layer capacitors with PEO and Sri Lankan natural graphite
Jayamaha, Bandara,Dissanayake, Malavi A.K.L.,Vignarooban, Kandasamy,Vidanapathirana, Kamal P.,Perera, Kumudu S. Techno-Press 2017 Advances in energy research Vol.5 No.3
Electrochemical double layer capacitors (EDLCs) have received a tremendous interest due to their suitability for diverse applications. They have been fabricated using different carbon based electrodes including activated carbons, single walled/multi walled carbon nano tubes. But, graphite which is one of the natural resources in Sri Lanka has not been given a considerable attention towards using for EDLCs though it is a famous carbon material. On the other hand, EDLCs are well reported with various liquid electrolytes which are associated with numerous drawbacks. Gel polymer electrolytes (GPE) are well known alternative for liquid electrolytes. In this paper, it is reported about an EDLC fabricated with a nano composite polyethylene oxide based GPE and two Sri Lankan graphite based electrodes. The composition of the GPE was [{(10PEO: $NaClO_4$) molar ratio}: 75wt.% PC] : 5 wt.% $TiO_2$. GPE was prepared using the solvent casting method. Two graphite electrodes were prepared by mixing 85% graphite and 15% polyvinylidenefluoride (PVdF) in acetone and casting n fluorine doped tin oxide glass plates. GPE film was sandwiched in between the two graphite electrodes. A non faradaic charge discharge mechanism was observed from the Cyclic Voltammetry study. GPE was stable in the potential windows from (-0.8 V-0.8 V) to (-1.5 V-1.5 V). By increasing the width of the potential window, single electrode specific capacity increased. Impedance plots confirmed the capacitive behavior at low frequency region. Galvanostatic charge discharge test yielded an average discharge capacity of $0.60Fg^{-1}$.
Nadeeka Bandara,김천현,김광표 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.2
The Bacillus cereus specific bacteriophageJBP901 has a broad host range spectrum among B. cereusisolates. JBP901, which belongs to the SPO1 group in thefamily Myoviridae, lyses 279 of 344 (81%) food andhuman isolates. B. subtilis (50 food isolates) and B. licheniformis (12 food isolates) were both insenstive toJBP901. JBP901 completely eradicated B. cereus in thefast fermented soybean product cheonggukjang withaddition of a divalent cation in a food application study . Divalent and monovalent cations play essential roles inadsorption and post-adsorption phases of JBP901 infection,respectively.