• Economic and Environmental Geology
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• v.40 no.1 s.182
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• pp.15-28
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• 2007

The study is for contaminations of major, rare earth and trace elements of the farmland soils from the Boeunjeil mine area. The results are compared with the soils of Chungjoo, Deokpyeong, Boeun and Chubu areas. Fe and S contents of the contaminated area are high relative to those from the uncontaminated areas, Chungjoo and Boeun areas. Trace elements of the contaminated area are high relative to those from uncontaminated area, Chunajoo, Deokpyeong, Boeun and Chubu areas. The trace elements ares divided into Cd, Ni, Sr, U, V, Zn and As, Co, Cu, Mo, Pb, Sb, based on these dispersion and correlation. Two groups show the positive correlation. Enrichment factor of potentially toxic elements from contaminated area is >5 value, but <4 value in the uncontaminated area. In the geoaccumulation index of the minor elements, the contaminated area has >1 value and the uncontaminated area has <1 value except Mn. Enrichment index of potentially toxic elements(As, Cd, Co, Cu, Ni, U, Zn) ranges from 0.3 to 87.0 in the contaminated area and from 0.4 to 3.9 in the uncontaminated area. Overall results show that the high contents of farmland soils for the elements(Fe, S, As, Cd, Co, Cu, Ni, U, Zn) indicate the contamination by coal-related activities.

• Journal of the Korean Magnetics Society
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• v.22 no.1
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• pp.19-22
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• 2012

$Ba_2Mg_{0.5}Co_{1.5}(Fe_{0.99}In_{0.01})_{12}O_{22}$ was prepared by the conventional solid-state reaction method, and studied by x-ray diffractometer, vibrating sample magnetometer, and Mossbauer spectrometer. The crystal structure was determined to be a single-phased rhombohedral with space group R-3m. Magnetization value were $M_s$ = 28.6 emu/g at 295 K. The hysteresis loops indicate that all the samples are ferrimagnetic behaviors. Mossbauer spectra of $Ba_2Mg_{0.5}Co_{1.5}(Fe_{0.99}In_{0.01})_{12}O_{22}$ have been 6-sextet taken at various temperatures ranging from 4.2 to 620 K. Based on the isomer shift (${\delta}$) values of all samples, the charge states were found to be $Fe^{3+}$ state at all temperatures, the Curie temperature was determined to be 630 K by the ZVC curve.

• Preventive Nutrition and Food Science
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• v.15 no.3
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• pp.167-175
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• 2010

This study was performed to explore the effects of the fermented functional extracts (FE) on blood glucose and lipid levels in diabetes. FE were created by mixing 9 kinds of plants with sea water and then allowing the mixture to ferment for 1 year. FE were supplemented in the feed of streptozotocin (STZ)-induced diabetic rats at 1%, 3% and 5%. The 1% feeding group showed the lowest weight loss of the three experimental groups. The blood glucose and glycosylated hemoglobin level were significantly decreased in the FE fed rats compared to the diabetic control (DMC) group. The lipid levels in serum were decreased in 1% and 3% FE fed rats in comparison to the DMC group, and there was no significant difference in triglyceride levels due to the FE concentration. The HDL-C level was significantly increased in rats with FE supplemented diets, compared to the DMC group. The levels of lipid peroxides in liver tissue were significantly decreased in FE fed diabetic rats, and the hepatic glycogen content was increased in rats receiving supplements. As a result of these studies, we believe 1% FE may be the optimum level for controlling blood glucose and alleviating hyperlipidemia in STZ-induced diabetic rats.

• Journal of the Korean Applied Science and Technology
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• v.18 no.3
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• pp.174-179
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• 2001

The spinel $Fe_{3}O_{4}$ powders were synthesized using 0.2 $M-FeSO_4{\cdot}7H_{2}O$ and 0.5 M-NaOH by oxidation in air and the spinel $LiMn_{2}O_{4}$ powders were synthesized at 480 $^{\circ}C$ for 12 h in air by a sol-gel method using manganese acetate and lithium hydroxide as starting materials. The synthesized $LiMn_{2}O_{4}$ powders were mixed at portion of 5, 10, 15 and 20 wt% of $Fe_{3}O_{4}$ powders using a ball-mill. The mixed catalysts were dried at room temperature for 24 hrs. The mixed catalysts were reduced by hydrogen gas at 350 $^{\circ}C$ for 2 h. The carbon dioxide decomposition rates of the mixed catalysts were 90% in all the mixed catalysts but the decomposition rate of carbon dioxide was increased with adding $LiMn_{2}O_{4}$ powders to $Fe_{3}O_{4}$ powders.

• Journal of the Korean Ceramic Society
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• v.18 no.2
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• pp.83-90
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• 1981

In this study, the effect of additions on magnetic properties in the system of [$Ni_{0.32}Zn_{0.68}$] 1-x Mx $Fe_2O_4$ have been investigated. The additions, Co or Mg or Cu, was added in turn in place of M, and its composition was varied from 0.1 mo1% to 0.5 mo1%. The materials were blended by hot petroleum drying method, and sintered with the rate of 30$0^{\circ}C$/h in the air. The sintering temperatures were varied from 110$0^{\circ}C$ to 130$0^{\circ}C$, with the intervals of 5$0^{\circ}C$, and matured for 3hrs. The results are: 1) The permeability decreased when the addition, MgO or CoO, was added, and it increased when CuO was added. 2) Resistivity had the lowest Value when CuO was added.

• Biomolecules & Therapeutics
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• v.4 no.3
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• pp.244-250
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• 1996

In this study, the anti-lipidperoxidative effects of G009, a polysaccharide extracted from Ganoderma lucidum IY009, was determined in ascorbic acid-$Fe^{2+}$-adenosine 5-diphosphate-intoxicated rat. In a model of ascorbic acid-Fe$^{2+}$-adenosine 5-diphosphate-induced hepatotoxicity in rat, G009 exhibited anti-lipidperoxidative effect in rat liver homogenate, and that malondialdehyde values of the liver homogenate inhibited from 48.1% to 74.8% in comparison to controls (p<0.05). The malondialdehyde formation in serum inhibited 66.5% at 100 mg/kg of G009. Also, serum levels of glutamic oxaloacetic transaminase and glutamic pyruvic transaminase in peroxidizer-induced rats treated with G009 was decreased compared with control. Especially, the formation of lipid peroxides in serum was related to glutamic pyruvic transaminase levels. These results suggest that G009 has a protective effect on ascorbic acid-$Fe^{2+}$-adenosine 5-diphosphate-induced hepatic injury through an inhibition of lipid peroxidation in liver.r.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1996.04a
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• pp.222-222
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• 1996

In order to elucidate the correlation between the lipid peroxidation and hepatotoxicity, the formation of malondialdehyde (MDA) in liver homogenate and serum, and the transaminase activities were determined in intoxicated by ascorbic acid-Fe$\^$2+/-ADP in rat. In a model of ascorbic acid-Fe$\^$2+/-ADP hepatotoxicity, G009, which was obtained from Ganoderma lucidum IY009, exhibited anti-lipid peroxidative effect in rat liver homogenate, and that MDA values of the liver homogenate decreased from 48.1% to 74.8% in comparision to controls (p<0.01) Also, the MDA formation in serum inhibited 66.5% at 100 mg/kg of G009. Serum levels of glutamic oxaloacetic transaminase(GOT) and glutamic pyruvic transaminase(GPT) in peroxidizer-induced rats treated with G009 was decreased compared with control. Especially, The formation of lipid peroxides in serum was related to GPT levels. These results that G009 has a protective effect on ascorbic acid-Fe$\^$2+/-ADP-induced hepatic injury through an inhibition of lipid peroxidation in liver.

• Proceedings of the KIEE Conference
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• 1999.11d
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• pp.891-893
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• 1999

Invar alloys have characteristics with very low thermal expansion coefficient and low tensile strength. The mechanical properties of invar alloy have to being improved to apply for structural materials, especially for core of transmission line in electrical field. It is necessary low thermal expansion and high strength core material to transmit increased current capacity. In this paper, we investigated effect of Mo addition affected to thermal and mechanical properties and microstructure in Fe-Ni-Co ternary system.

• Korean Journal of Soil Science and Fertilizer
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• v.1 no.1
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• pp.129-136
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• 1968

Low-Humic Gley Soils occur very commonly in Korea and constitute important paddy soils of the country. These soils are developed either on alluvial or fluvio-marine materials. The soils in the present invest igation are derived from the latter. The interesting morphological features of these two soils are the presence of $FeCO_3$ concretions in the subsoil and the occurrence of a buried black organic horizon of variable thickness(25-100 cm). The organic horizon overlies the greenish marine material and underlies the continental material. These soils have poor drainage and are wet most of the year. The presence of $FeCO_3$ concretions in poorly drained paddy soils has previously been reported in North America(8), Japan(9) and West Europe(7). The purpose of this investigation is to study the chemical and mineralogical characteristics of these soils; and the genesis of $FeCO_3$ concretions. Profile samples of both these soils were collected from Gimjae area, in co-operation with the Soil Survey Party. These profiles were described as follows:

• Nuclear Engineering and Technology
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• v.41 no.3
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• pp.319-326
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• 2009

This study was carried out to investigate the high-acidity co-separation of Am and RE from a simulated radwaste solution by a solvent extraction using a mixture of Dimethyldibutyltetradecylmalonamide (DMDBTDMA, as an extractant) and dihexyl octanamide (DHOA, as a phase modifier) diluted with n-dodecane (NDD). All the experiments were conducted as a batch type. First, the environmentally friendly DMDBTDMA and DHOA composed of only CHON atoms were self-synthesized. Then, the conditions for the prevention of a third phase, generated in the organic phase were examined. In addition, the effects of the concentration of nitric acid, DHOA, oxalic acid and $H_2O_2$ on the co-extraction of Am and RE were elucidated. Consequently, the optimum condition of (0.5M DMDBTDMA+0.5M DHOA)/NDD-0.3M $C_2H_2O_4-4.5M$ $HNO_3$ and O/A=2 was obtained through experimental work. Under this condition, the extraction yields were found to be about 80% for Am, more than 70% for RE such as La, Eu, Nd, Ce, etc., 3% for Cs and Sr, 69% for Fe and less than 11% for Mo and Ru. For the co-extraction of Am and RE, Fe should be removed in advance or prevented from a co-extraction with Am by controlling the different extraction rates of Am and Fe. About 95% of the Am and RE in the organic phase were stripped using a 0.5M $HNO_3$.