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Dharmalingam Sivanesan,Bongkuk Seo,Choong-sun Lim,Hyeon-Gook Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
The conversion of CO2 into value-added chemicals of industrial significance is of great interest due toglobal warming-related concerns and the depletion of natural resources. This paper describes amononuclear copper complex with an N3S coordination environment that can catalyze the conversion ofCO2 into the carbonate anion with an ambient O2. Electrochemical studies indicate that the N3S-ligatedCu(II) complex can be reduced to Cu(I), which can subsequently generate the carbonate anion from CO2and ambient O2. In presence of LiClO4 when the N3S-ligated complex Cu(II) is reduced to Cu(I), thecomplex easily releases the carbonate anion which easily precipitates as Li2CO3 in CH3CN. These studiessuggest that the N3S-ligated Cu(II)/(I) complexes can be used to convert CO2 to carbonate and isolate thegenerated carbonate.
Dielectric Study of Methyl Acrylate-Alcohol Mixtures Using Time Domain Reflectometry
Dharmalingam, K.,Ramachandran, K.,Sivagurunathan, P.,Prabhakar , B.,Khirade, P.W.,Mehrotra, S.C. Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.12
Dielectric studies of methyl acrylate with 1-propanol, 1-butanol, 1-heptanol and 1-octanol binary mixtures have been carried out over the frequency range from 10 MHz to 10 GHz at temperatures of 283, 293, 303 and 313 K using Time Domain Reflectometry (TDR) for various concentrations. The Kirkwood correlation factor and excess inverse relaxation time were determined and discussed to yield information on the molecular structure and dynamics of the mixture. The values of the static dielectric constant, relaxation time and the Kirkwood correlation factor decrease with increased concentration of methyl acrylate in alcohol. The Bruggman plot shows a non-linearity of the curves for all the systems studied indicates the heterointeraction which may be due to hydrogen bonding of the OH group of alcohol with C=O of the methyl acrylate. The excess inverse relaxation time values are negative for all the systems at all the temperatures indicates that the solute-solvent interaction hinders the rotation of the dipoles of the system.
Enhanced CO2 absorption and desorption in a tertiary amine medium with a carbonic anhydrase mimic
Dharmalingam Sivanesan,윤민혜,Arti Murnandari,강지민,박기태,김학주,정순관 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-
We report the effects of a series of carbonic anhydrase (CA) model complexes on CO2 absorption anddesorption in an aqueous tertiary amine medium. The CO2 hydration efficiency was determined underbasic conditions by using stopped-flow kinetics experiments. Catalyst 6 was found to exhibit the best CO2hydration efficiency (3.130 103M 1 s 1) in the tertiary amine medium. In a highly concentrated tertiaryamine medium, catalyst 2 was found to enhance the absorption and regeneration efficiency of CO2 by 10%and 24%, respectively. Our results for simple CA model complexes indicate that possible usage ofsynthesized complexes in post-combustion process.
Dharmalingam, Sivanesan,Koo, Eunhae,Yoon, Sungho,Park, Gyoosoon Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.3
A Cu(II) complex with an three nitrogens and one sulfur coordination environment was synthesized and characterized. Its redox potential was observed at 0.483 V vs. NHE, very similar to that of a Cu-containing fungal enzyme, galactose oxidase, which catalyzes the oxidation of alcohols to corresponding aldehydes with the concomitant reduction of molecular oxygen to water. The Cu(II) complex selectively oxidizes the benzylic alcohols using TEMPO/$O_2$ under mild reaction conditions to corresponding aldehydes without forming any over-oxidation product. Moreover, the catalyst can be recovered and reused multiple times for further oxidation reactions, thus minimizing the waste generation.
Catalytic effect of metal oxides on CO<sub>2</sub> absorption in an aqueous potassium salt of lysine
Dharmalingam, Sivanesan,Park, Ki Tae,Lee, Ju-Yeol,Park, Il-Gun,Jeong, Soon Kwan THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.68 No.-
<P><B>Abstract</B></P> <P>We report the catalytic effects of metal oxides on the CO<SUB>2</SUB> absorption rate in an aqueous potassium salt of <SMALL>L</SMALL>-lysine-HCl using the vapor liquid equilibrium method. The best CO<SUB>2</SUB> absorption rate obtained through testing metal oxides in a highly concentrated potassium salt of amino acids (2.0M) was identified using CuO. The recyclability of the metal oxides was tested over three cycles. The catalyst CuO was found to enhance the absorption rate of CO<SUB>2</SUB> by 61%. A possible mechanism was proposed based on NMR spectroscopy studies. Further, the effect of change in liquid absorbent viscosity on CO<SUB>2</SUB> absorption is discussed.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Dharmalingam Mohandass,Jian-Li Zhao,Yong-Mei Xia,Mason J. Campbell,Qing-Jun Li 국립중앙과학관 2015 Journal of Asia-Pacific Biodiversity Vol.8 No.3
Recent herbarium-based phenology assessments of many plant species have found significant responses to global climate change over the previous century. In this study, we investigate how the flowering phenology of three alpine ginger Roscoea species responses to climate change over the century from 1913 to 2011, by comparing between herbarium-based phenology records and direct flowering observations. According to the observations, flowering onset of the three alpine ginger species occurred either 22 days earlier or was delayed by 8e30 days when comparing the mean peak flowering date between herbarium-based phenology records and direct flowering observations. It is likely that this significant change in flowering onset is due to increased annual minimum and maximum temperatures and mean annual temperature by about 0.053℃ per year. Our results also show that flowering time changes occurred due to an increasing winterespring minimum temperature and monsoon minimum temperature, suggesting that these Roscoea species respond greatly to climate warming resulting in changes on flowering times.
Sowmiya Dharmalingam,Anandhakumar Palanisamy 한국전자통신연구원 2018 ETRI Journal Vol.40 No.4
A vector space based augmented structural kinematic (VSASK) feature descriptor is proposed for human activity recognition. An action descriptor is built by integrating the structural and kinematic properties of the actor using vector space based augmented matrix representation. Using the local or global information separately may not provide sufficient action characteristics. The proposed action descriptor combines both the local (pose) and global (position and velocity) features using augmented matrix schema and thereby increases the robustness of the descriptor. A multiclass support vector machine (SVM) is used to learn each action descriptor for the corresponding activity classification and understanding. The performance of the proposed descriptor is experimentally analyzed using the Weizmann and KTH datasets. The average recognition rate for the Weizmann and KTH datasets is 100% and 99.89%, respectively. The computational time for the proposed descriptor learning is 0.003 seconds, which is an improvement of approximately 1.4% over the existing methods.
Dielectric Study of Methyl Acrylate-Alcohol Mixtures Using Time Domain Reflectometry
K. Dharmalingam*,K. Ramachandran,P. Sivagurunathan,B. Prabhakar Undre,P. W. Khirade,S. C. Mehrotra 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.12
Dielectric studies of methyl acrylate with 1-propanol, 1-butanol, 1-heptanol and 1-octanol binary mixtures have been carried out over the frequency range from 10 MHz to 10 GHz at temperatures of 283, 293, 303 and 313 K using Time Domain Reflectometry (TDR) for various concentrations. The Kirkwood correlation factor and excess inverse relaxation time were determined and discussed to yield information on the molecular structure and dynamics of the mixture. The values of the static dielectric constant, relaxation time and the Kirkwood correlation factor decrease with increased concentration of methyl acrylate in alcohol. The Bruggman plot shows a non-linearity of the curves for all the systems studied indicates the heterointeraction which may be due to hydrogen bonding of the OH group of alcohol with C=O of the methyl acrylate. The excess inverse relaxation time values are negative for all the systems at all the temperatures indicates that the solute-solvent interaction hinders the rotation of the dipoles of the system.
Performances of Monthly Income Scheme in Indian mutual Fund Industry
N Dharmalingam,K Balanaga Gurunathan 한국유통과학회 2016 KODISA ICBE (International Conference on Business Vol.2016 No.-
Mutual funds are an integral part of the stock market. It has become the investment avenue for large number of investors in the past 10 years. Also the stock market volatility is high in these years. Thus in order to analyze the performance of top funds under importance schemes, a research has been done. Ten mutual funds in the income fund category were selected based on their returns. The main focus of this research is to find the risk and return features and study the performance of the funds and to compare it with the market return. The research is limited NAV data for ten income funds available for (2005-2015). The findings will be useful to bring out insight into investment avenues.