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Karki, S.,Aryal, P.,Kim, H.J.,Kim, Y.D.,Park, H.K. Elsevier 2018 Nuclear Instruments & Methods in Physics Research. Vol.877 No.-
<P><B>Abstract</B></P> <P>The first phase of the AMoRE (Advanced Mo-based Rare process Experiment) is to search for neutrinoless double-beta decay of <SUP>100</SUP>Mo with calcium molybdate ( <SUP> Ca 100 </SUP> <SUB> MoO 4 </SUB> ) crystals enriched in <SUP>100</SUP>Mo and depleted in <SUP>48</SUP>Ca using a cryogenic technique at Yangyang underground laboratory in Korea. It is important to know <SUP>100</SUP>Mo- and <SUP>48</SUP>Ca-isotope ratios in <SUP> Ca 100 </SUP> <SUB> MoO 4 </SUB> crystal to estimate half-life of <SUP>100</SUP>Mo decays and to 2 ν β β background from <SUP>48</SUP>Ca. We employed the ICP-MS (Inductive Coupled Plasma Mass Spectrometer) to measure <SUP>100</SUP>Mo- and <SUP>48</SUP>Ca-isotope ratios in <SUP> Ca 100 </SUP> <SUB> MoO 4 </SUB> crystal. The measured results for <SUP>100</SUP>Mo- and <SUP>48</SUP>Ca-isotope ratios in the crystal are ( 94 . 6 ± 2 . 8 ) % and ( 0 . 00211 ± 0 . 00006 ) %, respectively, where errors are included both statistical and systematic uncertainties.</P>
( Karki Sujeeta ),( Ja Hyung Choi ),( Jeeban Poudel ),( Sea Cheon Oh ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 심포지움 Vol.2018 No.1
Comparative analysis of the performance of fluidized bed and downdraft fixed bed reactor in torrefaction is the primary objective of the research. Many researches have focused on the performance of fixed bed reactors with a few published works in fluidized bed. However, no research has focused on the comparison of fluidized bed and downdraft fixed bed reactors in spite of their immense potential as torrefaction reactors. Sewage sludge was taken as the raw material to study the torrefaction characteristics. The effects of the main torrefaction variables, temperature and residence time, on the performance parameters such as fixed carbon, calorific value; molar ratios, ultimate and proximate analysis, chemical exergy etc. were investigated for torrefied sewage sludge. Although continuous research with multiple replicated data is required before developing a concrete conclusion, the study showed that the fixed bed reactor is more favorable compared to fluidized bed despite the leverage that fluidized bed offers.
Karki, Sujita,Kesavulu, C.R.,Kim, H.J.,Kaewkhao, J.,Chanthima, N.,Ruangtaweep, Y. Elsevier 2018 Journal of luminescence Vol.197 No.-
<P><B>Abstract</B></P> <P>Silicoborate glasses with composition of (BSYCaSm:(55-x)B<SUB>2</SUB>O<SUB>3</SUB>+ 10SiO<SUB>2</SUB> +25Y<SUB>2</SUB>O<SUB>3</SUB> +10CaO + xSm<SUB>2</SUB>O<SUB>3</SUB>), (where, x= 0.05, 0.10, 0.20, 0.25, 0.30, 0.40, 0.50, mol%) have been synthesized by using the well-known melt quenching technique. The present work deals with physical, optical, photoluminescence, X-ray luminescence and decay time studies of silicoborate glasses. Judd-Ofelt (JO) intensity parameters (Ω<SUB>2,</SUB> Ω<SUB>4</SUB> and Ω<SUB>6</SUB>) and radiative properties for the important luminescent level of Sm<SUP>3+</SUP> ions were derived by using the absorption spectrum of 0.3mol% Sm<SUB>2</SUB>O<SUB>3</SUB> doped glass. The luminescence spectra in the visible region was obtained due to <SUP>4</SUP>G<SUB>5/2</SUB> → <SUP>6</SUP>H<SUB>J</SUB> (5/2, 7/2, 9/2 and 11/2) transition of Sm<SUP>3+</SUP> ion under 401nm excitation. The decay profile for the <SUP>4</SUP>G<SUB>5/2</SUB> level of Sm<SUP>3+</SUP> ions was analyzed and found that for lower concentration (≤ 0.20mol%) it is single exponential in nature whereas for higher concentration (≥ 0.25mol%), it turns in to non-exponential due to the transfer of energy between donor (excited state Sm<SUP>3+</SUP>ion) and acceptor (ground state Sm<SUP>3+</SUP> ion). As the concentration of Sm<SUP>3+</SUP> ions increases the decay time of <SUP>4</SUP>G<SUB>5/2</SUB> state decreases. The well-known Inokuti-Hirayama (IH) model was used for fitting the non-exponential decay curves where S = 6 indicates that energy transfer process is of dipole-dipole type. Hence, in the present work, intense transition of <SUP>4</SUP>G<SUB>5/2</SUB> → <SUP>6</SUP>H<SUB>7/2</SUB> (601nm) is found to be suitable for reddish-orange laser emission. CIE chromaticity diagram has been performed for verifying the results of fluorescence in visible laser applications at 601nm.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Effect of Sowing Time on Germination and Early Seedling Growth of Quercus floribunda Lindl.
Karki, Himani,Bargali, Kiran,Bargali, SS Institute of Forest Science 2018 Journal of Forest Science Vol.34 No.3
Quercus floribunda (Tilonj oak) is among the five species of Quercus and an evergreen tree found in Kumaun Himalayan region. Timing of germination is a crucial event determining the success of seedling establishment and survival. The aims of the study were to investigate the effect of sowing date on the germination and morphological responses of Tilonj oak (Quercus floribunda), cultivated during the month of August-September, with supplementary irrigation. The experiment was conducted by sowing seeds at two dates with one month interval in glass house conditions at DSB Campus, Nainital, Uttarakhand, India. Present study revealed that higher germination percentage (46.67 %) was recorded at sowing time $S_2$ as compared to the sowing time $S_1$ (32.86 %). Germination percentage as well as seedling growth were affected by sowing date though the differences were insignificant. At both the sowing dates, highest germination percentage was recorded for large seeds (32.86-46.67 %) followed by medium (31.43-33.33 %) and lowest germination (6.67-7.14 %) was recorded for small size seeds. In all parameters assessed, sowing time $S_2$ had the best performance in combination with large seed size. Thus, September is suitable month for best germination, growth and seedling vigour and large seed size is recommended to silviculturists and tree planters. The information on seed germination and seedling growth is vital both for conservation and rehabilitation of degraded lands.
Karki Sujeeta,Ja hyung Choi,Jeeban Poudel,Sea Cheon Oh 한국폐기물자원순환학회 2018 한국폐기물자원순환학회 학술대회 Vol.2018 No.05
The aim of this project was to explore the potential of the torrefaction treatment for upgrading sewage sludge into valuable product. An ancillary investigation on the cold fluidization and the behavior of sewage sludge was analyzed. The effects of the main torrefaction variables, temperature and residence time, on the performance parameters such as fixed carbon, calorific value; molar ratios, ultimate and proximate analysis, chemical exergy etc. were investigated for torrefied sewage sludge. Results for both the reactors showed that the thermochemical transformations that sewage sludge underwent, as a results of the release of volatile matter due to thermal decomposition of its organic constituents, resulted in significant improvement of their chemical and physical properties. Results obtained from this study showed that despite the leverage that fluidized bed offers (heat and mass transfer) fixed bed configuration was more pronounced for torrefaction of sewage sludge. However, a decisive conclusion cannot be made at this stage as more detail study would be required to draw a definitive conclusion over the preference of reactor for torrefaction.
( Karki Sujeeta ),( Poudel Jeeban ),오세천 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
In the present work, fluidization of sewage sludge, a non-lignocellulosic biomass, was studied using a bench scale fluidized bed. The influence of torrefaction temperature ranging from 200 - 350°C and residence time of 0 - 50 minutes on the physical and chemical properties of sewage sludge was investigated. The properties of torrefied product were analyzed on the basis of degree of torrefaction, ultimate and proximate analysis, gas analysis and chemical exergy. The degree of torrefaction and chemical exergy showed positive influence on increasing the torrefaction temperature. The effect of torrefaction temperature and residence time was studied on elemental variation of sewage sludge which exhibited a decrease of H/C and O/C ratios. The product gas emitted during torrefaction was analyzed to study the pathway of hydrocarbons and oxygen containing compounds. Torrefaction using fluidized bed improved the overall physiochemical properties of sewage sludge.
( Karki Sujeeta ),( Ja Hyung Choi ),( Jeeban Poudel ),( Sea Cheon Oh ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2018 No.-
The aim of this project was to explore the potential of the torrefaction treatment for upgrading sewage sludge into valuable product. An ancillary investigation on the cold fluidization and the behavior of sewage sludge was analyzed. The effects of the main torrefaction variables, temperature and residence time, on the performance parameters such as fixed carbon, calorific value; molar ratios, ultimate and proximate analysis, chemical exergy etc. were investigated for torrefied sewage sludge. Results for both the reactors showed that the thermochemical transformations that sewage sludge underwent, as a results of the release of volatile matter due to thermal decomposition of its organic constituents, resulted in significant improvement of their chemical and physical properties. Results obtained from this study showed that despite the leverage that fluidized bed offers (heat and mass transfer) fixed bed configuration was more pronounced for torrefaction of sewage sludge. However, a decisive conclusion cannot be made at this stage as more detail study would be required to draw a definitive conclusion over the preference of reactor for torrefaction.