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Characterisation of Platinum Nanoparticles Electrodeposited on Carbon Felt
Dulal, S.M.S.I.,Won, Mi-Sook,Shim, Yoon-Bo Bangladesh Journals Online 2010 Journal of scientific research Vol.2 No.2
<P>Monodispersed and uniform sized platinum nanoparticles were electrodeposited on carbon felt from aqueous hydrogen hexachloroplatinate solution by a potential cycling method. The deposited nanoparticles were characterized by electrochemical technique and by scanning electron microscopy. It was found that the size and distribution of the nanoparticles could be controlled by changing the deposition parameters such as the scan rate and the number of cycle. The electrocatalytic property of the nanoparticles was tested by the oxidation of hydroquinone and phenol. It was found that the felt supported nanoparticles were effective towards electrodegradation of phenolic compounds. Keywords: Electrocatalyst; Electrodeposition; Hydroquinone; Phenol oxidation; Platinum nanoparticles; Carbon felt. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v2i2.3633 J. Sci. Res. 2 (2), 303-312 (2010) </P>
Structuration of e-Government Systems Assimilation: A Comprehensive Framework Development and Case
Dulal Hossain,문정훈,김진기,이철 한국경영정보학회 2011 Asia Pacific Journal of Information Systems Vol.21 No.3
The multifarious array of benefits to the e-Government systems research, from evaluative frameworks and conceptual models to guidelines for initiatives, adoption, and assimilation, evidences the requirement, both from the researcher's and the practitioner's standpoint, of sound theoretical foundations that can be applied directly in practice. Grounded upon structuration theory, this paper proposes a framework for e-Government systems assimilation through the structuration of its organizational factors. Upon this proposition, we map the factors of e-Government systems assimilation with the organizational meta-structures of signification, domination and legitimization. The framework is then tested for the case of one particular e-Government systems of Korean government. The juxtaposition of the theoretical position and the practical findings leads us to isolate the organizational, technological, and inter-organizational factors that shape the meta-structures for the assimilation of e-Government systems. This framework offers interesting possibilities to researchers in exploring the relationships and insights into the complex interactions that shape the relationships among government, people and technology. Thus, the paper's contribution lies on three axes: first, the furthering of a theoretical perspective of e-Government systems assimilation; second, a detailed exposition of the structuration theory and an illustration of its application to the issues of e-Government systems assimilation in the organizational context; and finally, developed framework through the isolation of a usable set of theoretically grounded factors affecting e-Government systems assimilation that can be applied in future research and practice.
Dulal Chandra,김지강,김용필 한국원예학회 2012 Horticulture, Environment, and Biotechnology Vol.53 No.1
The effects of different sanitizers on the quality and microbial populations of ‘Tah Tasai’ Chinese cabbage (Brassica campestris var. narinosa) microgreens were evaluated. Samples were washed in tap water (TW), 100 mL・L-1chlorinated water (Cl), 0.25% (w/v) each of citric and ascorbic acid mixed solution (CA + AS) as well as 0.5% (w/v)citric acid solution followed by 50% (v/v) ethanol spray (CA + E) and were packaged either in 35 µm polyethylene (PE) or polypropylene (PP) bag and stored at 5℃ for up to 9 days. The decline of O2 partial pressure of the packaged headspace and hue angle values were similar in both films. However, the CO2 partial pressure of the packaged headspace and the electrical conductivity were substantially higher in PP packaged samples than that in PE. Off-odor scores were also higher in PP film packaged samples compared to that of PE. CA + E and CA + AS treatments showed lower off-odor scale in both films. Although, visual quality scores showed similar trends at the beginning of storage, CA + E and CA + AS treated samples exhibited better quality on day 7. Samples washed in Cl showed lower microbial count numbers on washing day. However, CA + E treatment exhibited either the lowest or equivalent count numbers in both total aerobic counts and coliforms count to that of Cl until the end of storage. Considering environmental safety, our results suggest that CA + E treatment could be a useful replacement for Cl for the washing of microgreens and PE film would provide more benefits than PP for packaging microgreens.
Dulal Chandra,Toshiyuki Matsui,Haruo Suzuki,Yusuke Kosugi 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.2
The quality of harvested perishable products greatly depends on temperatures during transport and storage or market display. In this study, we evaluated the influence of low temperature and duration of storage on the storage quality in iceberg lettuce that were kept at 1±0.2℃ for 0 (control), 1 and 2 weeks and subsequently exposed to 20±2℃ for 10 days. Lettuce heads with prior storage at 1℃ for 1 or 2 weeks showed higher visual quality and lower level of wilting as compared to the control sample until 4 days of storage at 20℃. However, higher butt discoloration ratings were observed for 1 or 2-week stored samples. Higher hue angle value was observed in the 1-week sample until 4 days of storage as compared to the control or 2-week samples. No significant difference in textural quality was found between the control and 1℃ stored samples. In general, 1-week sample exhibited slightly higher puncture force and breaking energy value as compared with the control and 2-week samples. At the end of the storage, soluble sugar content declined by 52, 45 and 54% in the outer leaves and 70, 62 and 65% in the inner leaves of the control, 1 and 2-week stored samples, respectively. The heads with prior storage at 1℃ for 1 week showed a little higher sugar contents than those with 2-week or the control samples. In general, the outer leaves contained higher amount of sucrose, whereas the inner leaves contained higher amount of glucose and fructose. Although citric acid was found in trace amount, malic acid was the main component in organic acid fractions. Results suggest that iceberg lettuce could be stored at 1℃ for 2 weeks without affecting quality and that a better quality could be maintained at 20℃ with prior storage at 1℃ than continuous storage at 20℃.