• Korean Journal of Organic Agriculture
• /
• v.29 no.1
• /
• pp.111-123
• /
• 2021

This study was conducted to investigate the growth characteristics of strawberries and N₂O emission by treating the compost for each type of livestock manure, which was an organic farming material, as a basal fertilization in plastic film house. Livestock manure compost, which made from cattle manure, swine manure, and poultry manure as raw materials, were applied to this experiment, treated by mixing or single on the basis of nitrogen content with the standard amount of fertilizer for strawberries. Total emission of N₂O were 10.7% higher than those in poultry manure compost treatment compared to the inorganic fertilizer treatment, but 16.5~41.9% lower than those in other livestock manure compost treatment. The period of N₂O emission mainly was up to the 17th day after fertilizer application, accounting for 70~87% of the total amount of discharge, and 13~30% of the total amount was emitted for 158 days later. N₂O emission was decreased significantly NH₄⁺-N content in the soil, and increased NO₃^--N. As compared with control, the number of leaves, leaf width and crown diameter of livestock manure compost treatments were not significantly different, leaf length of cattle+poultry, cattle+ swine, swine+poultry treatment higher, and SPAD (soil plant analysis development) values of cattle+poultry treatment highest. There was no significant difference in weight and sugar content of strawberry fruits among treatments.

• The Journal of Natural Sciences
• /
• v.4
• /
• pp.85-93
• /
• 1991

In solid reaction of the eqimolecular mixture of $BaCO_3$ and $TiO_2$, $CO_2$ generates by the following reaction ; $BaCO_3 + TiO_2\longrightarrow$ $BaTiO_3 + CO_2$ The solid reaction is studied as the kinetics of decomposition reaction with DTA-TG. The results are as follows. 1. $BaCO_3$ with is coexisted with $TiO_2$ decompose at lower temperature than pure $BaCO_3$. The reason is decreasing free eneragy of products. 2. Carter's equation is more important than Jander's equation in solid reaction of $BaCO_3$ decomposi-tion. The activation energy obtained by Carte r's equation is 42.8 Kcal/mol.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.31 no.4
• /
• pp.398-404
• /
• 2007

In this paper, thermal characteristics of a nitrous oxide ($N_2O$) catalytic reactor with packed-bed geometry are theoretically and numerically investigated. Several researchers experimentally presented that catalytic decomposition of $N_2O$ in a packed bed generates about 82kJ/mole in the exothermic reaction. Based on the results they have studied the catalytic decomposition of $N_2O$ in a packed bed to use it not only as a mono-propellant thrust for small satellites but also as an igniter system for hybrid rockets. So we aim to identify important parameters existing in an $N_2O$ packed-bed geometry, and to clarify its critical effect on thermal characteristics of the catalytic igniter using a porous medium approach.

• Journal of the Korean Applied Science and Technology
• /
• v.29 no.3
• /
• pp.466-472
• /
• 2012

Visible-light-responding photocatalysts, $N-TiO_2$, were prepared by nitrogen doping onto $TiO_2$. The crystalline structure and morphology, doping state of the prepared photocatalysts were characterized by XRD, FE-SEM, and XPS. The activity of the prepared photocatalysts was examined by the decomposition of methyleneblue. The prepared catalysts were anatase type and the crystallinity was increased with pH. The particle sizes of the prepared catalysts were 5.42, 5.99, 7.58 nm at pH 2.2, 4.7, 9.0, respectively. The particle sizes of the prepared catalysts were slightly increased with pH. The activity of the photocatalysts was directly proportional to the crystallinity of the catalysts. $N-TiO_2$ prepared by nitrogen doping onto $TiO_2$ showed activity under visible light. The doped nitrogen was located not in the lattice but on the surface.

• Korean Journal of Environmental Agriculture
• /
• v.9 no.2
• /
• pp.153-159
• /
• 1990

Two fractions(microsomal and soluble) were prepared by ultracentrifugation(105,000G for 1hr at $4^{\circ}C$) from pig liver in order to find the major factor in Diazinon degradation. The two enzyme activities showed the same value, but Diazinon was degraded three times in microsomal fraction more than in soluble fraction. And with addition of EPN, Beam and PBO, degradation of diazinon was inhibited(29, 30 and 60%) as well as Monooxygenase activity (14, 15 and 35%) in microsomal fraction, respectively.

• Solar Energy
• /
• v.12 no.3
• /
• pp.10-20
• /
• 1992

In this experiment, photochemical reaction has been applied to destroy TCE in water phase. The main target of this work is to investigate the technical feasibility of large scale of solar detoxification reactor for water treatment. The results have revealed that solar detoxification utilizing photon energy from the sun is the most attractive process to decompose organic toxins in water phase at room temperature. The detailed results from this work are as follows; (1) The highest conversion ratio of TCE was obtained by using $TiO_2$, annatase as a photocatalyst among $TiO_2$ anatase, $TiO_2$ rutile and $V_2O_5$ under the same experimental condition. The anatase crystal structure was confirmed with XRD analysis, and its surface area was 7.748 $m^2/g$ from the BET-$N_2$ measurement (2) 0.1 wt% of $TiO_2$ anatase has been adopted as optimal quantity for batch slurry reactor at this experimental conditions. (3) The effect of hydrogen peroxide on the conversion of TCE was investigated. Its optimal quantity was 0.06 vol. % under this experimental conditions. (4) The effect of oxygen on the conversion of TCE also was studied by controlling the head space in photoreactor. Results indicated that sufficient amount of oxygen should be supplied to accomplish the highest conversion rate of TCE in water phase.

• Korean Journal of Soil Science and Fertilizer
• /
• v.45 no.6
• /
• pp.1086-1093
• /
• 2012

This research was carried out to develop the correction method of VDI4630 method improving accuracy, and investigated the effects of carbonate ion ($CO_3{^{2-}}$) and reactant water ($H_2O$) on anaerobic organic biodegradability in VDI4630 method. Pig blood, pig intestine residue, pig digestive tract content, and cattle rumen content were experimented as waste biomasses. Chemical formulas of pig blood, pig intestine residue, pig digestive tract content, and cattle rumen content were $C_{3.78}H_{8.39}O_{1.46}N_1S_{0.01}$, $C_{9.69}H_{15.42}O_{2.85}N_1S_{0.03}$, $C_{25.17}H_{43.32}O_{15.04}N_1$, $C_{27.23}H_{42.38}O_{15.93}N_1S_{0.11}$, respectively. And amount of reactant moisture for the anaerobic degradation of organic materials were 0.336, 0.485, 0.227, 0.266 mol, respectively. In pig blood, pig intestine residue, pig digestive tract content, and cattle rumen content, anaerobic organic biodegradability presented as $B_u/B_{th}$ were 82.3, 81.5, 70.8, and 66.1%, and anaerobic organic biodegradability (AB) by VDI4630 method were 72.2, 87.8, 74.2, 62.0%, and that were significantly different with anaerobic organic biodegradability presented as $B_u/B_{th}$. The effects of carbonate ion and reactant water on anaerobic organic biodegradability were not significant, But Accuracy of anaerobic organic degradability was expected to able to be improved by the correction method of VDI4630 considering the carbonate ion at digestate and the reactant water quantified.

• Applied Biological Chemistry
• /
• v.3
• /
• pp.25-48
• /
• 1962

The polysaccharide C prepared from gum tragacanth powder (U. S. P. grade) by the precipitation method with 85% ethanol was a neutral polysaccharide, $[{\alpha}]^{30}_D-72.2$. The polysaccharide C consisted of L-rhamnose, D-xylose, L-arabinose and D-galactose in the molar ratio 2:1:17:9 (Table 1, 2, 3, ). The polysaccharide C was methylated with dimethylsulphate and 40% NaOH, and Purdies regent. The hydrolyzate of fully methlated product ($[{\alpha}]^{22}_D-102$ in chloroform, the methoxy content 40.6%) was composed of 2, 3, 5-tri-O-methyl-L-arabofuranose (I), 3,4-di-O-methyl-L-rhamnopyranose (II), 2,3-di-O-methyl-D-xylose (III), 2,3,4-tri-O-methyl-D-galactopyranose (IV), 2,4-di-O-methyl-L-arabopyranose (?), 2,4-di-O-methyl-D-galactose(VI), 2-O-methyl-D-arabinose (VII), and L-arabopyranose(VIII) (Table 4, 5, and Fig. 4). The first partial hydrolysis (A) of the polysaccharide C with 0.05N-HCl for 4.5 hours at $80-85^{\circ}C$ released only L-arabinose: the second hydrolysis (B) with 0.1N-HCl for 5 hours at $80-85^{\circ}C$, L-arabinose and D-galactose; and the third hydrolysis (C) with 0.3N-HCl at $90-95^{\circ}C$ in sealed tube, L-rhamnose, D-xylose, L-arabinose and D-galactose. From the unhydrolyzate A' were found L-rhamnose, D-xylose, L-arabinose, and D-galactose; from B' L-rhamnose, d-xylose, L-arabinose and D-galactose; and from C' D-xylose and D-galactose respectively (Table 6). The periodate consumption and formic acid production of the polysaccharide C were measured at various time intervals. After 120 hours periodat was consumed by 1.23 mole per $C_5H_8O_4$ and formic acid was produced 0.78 mole per $C_5H_8O_4$ (Table 7). Although a definite chemical structure for this polysaccharide C may not be formulated, experimental data, especially, from methylation, partial hydrolysie and determination of its molar ratio, and periodate analysis showed that the polysaccharide C is a highly branched polysaccharide and would be constructed of galactoaraban as a main chain residue and L-arabofuranose, D-galactopyranosyl $(1{\rightarrow}1)$-L-arabofuranose, D-xylopyranosyl $(1{\rightarrow}2)$-L-rhamnopyranosyl $(1{\rightarrow}1)$-L-arabofuranose, and L-rhamnopyranosyl $(1{\rightarrow}1)$-arabofuranose, and D-galactopyranosyl-$(1{\rightarrow}2)$-L-arabopyranosyl-$(1{\rightarrow}1)$-I-arabofuranose as a branch chain or end group (page 21).

• The Korean Journal of Zoology
• /
• v.36 no.3
• /
• pp.347-352
• /
• 1993

N-ethylmaleimide at low concentrations is known to interact specifically with 2 sulfhydryl residues in myosin heavy chain. Calpain, a Ca$^2$+-dependent neutral protease isolated from chick skeletal muscle, was found to preferentially degrade the alkylated protein but much less significantly the unmodified protein. Exposure of myosin to KMnO$_4$, which is also known to interact with sulthydryl groups, also caused the rapid degradation of the myosin heavy chain. Furthermore, treatment of each agent with increasing concentrations results in a greater loss of the myosin ATPase activity, indicating that the modification occurred at the reactive site sulfhydryl residues. These results suggest that the covalent modification at the reactive site salfhydryl residues in the myosin heavy chain may mark the protein for degradation by intracellular proteases such as calpain.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2018.06a
• /
• pp.90-90
• /
• 2018

디스플레이는 다수의 가로 전극과 세로 전극으로 구성되고, 전극에 신호를 주어 동작하도록 하는 원리이다. 이 디스플레이에는 전기가 통하고 투명한 전극이 필수적으로 사용되고 있고, 대표적인 투명 전극으로 ITO (Indium Tin Oxide)가 있다. ITO 박막은 $In_2O_3$에 Sn을 첨가하여 $Sn^{4+}$ 이온이 $In^{3+}$ 이온을 치환하고 이 과정에서 잉여 전자가 전기전도에 기여하는 구조이다. ITO 박막은 표면 처리 방법에 따라 표면 상태가 크게 변화한다. 플라즈마를 이용한 표면 처리는 환경오염이 적으며 강도, 탄성률 등과 같은 재료의 기계적 특성을 변화시키지 않으면서 표면 특성만을 변화시킬 수 있는 방법으로 알려져 있다[1]. UV (Ultraviolet)를 조사한 표면처리는 ITO 표면의 탄소를 제거하고, 표면 쌍극자를 형성하며, 표면의 조성을 변화시킬 수 있으며, 페르미 에너지 준위를 이동시킬 수 있어 ITO의 일함수를 증가시킬 수 있다[2]. ITO에 대한 다양한 연구가 수행되었음에도 불구하고 보다 다양한 관점에서의 연구가 지속될 필요가 있다. 따라서 본 연구에서는 다양한 조건으로 표면 처리한 ITO 표면의 일함수, 면저항, 표면 형상, 평탄도, 접촉각 등에 대해 알아보고자 한다. 세정한 ITO, 세정 후 UV 처리한 ITO (UV 처리 시간 2분, 4분 6분, 8분), 세정 후 $N_2$, $O_2$, Ar의 공정 가스를 사용하여 Plasma 처리한 ITO로 표면 처리 조건을 변화하였다. 표면 처리한 ITO의 특성은 Kelvin Probe를 이용한 일함수, 물방울 형상의 각도를 측정한 접촉각, AFM (Atomic Force Microscope)을 이용한 평탄도, 가시광선 (380~780 nm) 파장에 대한 투과도와 면저항을 측정하였다. 접촉각은 세정한 ITO의 경우 $45.5^{\circ}$에서 세정 후 UV를 조사한 ITO의 경우 UV 8분 조사 시 $27.86^{\circ}$로 감소하였고, $N_2$, $O_2$, Ar 가스를 사용하여 Plasma 처리한 ITO는 모두 $10^{\circ}$ 미만을 나타내었다. 플라즈마 처리에 의하여 접촉각이 현저하게 개선되었다. ITO의 면저항은 표면 처리 조건에 따라 $9.620{\sim}9.903{\Omega}/{\square}$로 그 차이가 매우 적어 표면처리에 의하여 면저항의 변화는 없는 것으로 판단된다. 가시광선 영역에서의 투과도는 공정 조건에 따라 87.59 ~ 89.39%로 그 차이가 적어 표면처리에 의한 변화를 나타내지는 않은 것으로 판단된다. 표면 처리 조건에 따른 평탄도 $R_{rms}$는 세정한 ITO의 경우 4.501 nm로부터 UV 2, 4, 6, 8분 처리한 경우 2.797, 2.659, 2.538, 2.584 nm로 평탄도가 개선되었다. $N_2$, $O_2$, Ar 가스를 사용하여 플라즈마 처리한 ITO의 경우 평탄도 $R_{rms}$는 2.49, 4.715, 4.176 nm로 사용한 가스의 종류에 따라 다른 경향을 나타내었다. 표면 처리 조건에 따른 평탄도 Ra는 세정한 ITO의 경우 3.521 nm로부터 UV 2, 4, 6, 8분 처리한 경우 1.858, 1.967, 1.896, 1.942 nm를, $N_2$, $O_2$, Ar 가스를 사용하여 플라즈마 처리한 ITO의 경우는 1.744, 3.206, 3.251 nm로 평탄도 $R_{rms}$와 유사한 경향을 나타내었다.