• Journal of the Korean Applied Science and Technology
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• v.33 no.1
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• pp.129-135
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• 2016

CO oxidation was performed with Cu-Mn and Cu-Zn co-precipitated catalysts as differential precipitant, metal ratio and calcination temperature. The effects of differential metal mole ratio and calcination temperature in mixed metal oxide catalyst were investigated with CO oxidation reaction. Physiochemical properties were studied by XRD, $N_2$ sorption and SEM. 2Cu-1Mn with $Na_2CO_3$ catalyst calcined at $270^{\circ}C$ has a large surface area $43m^2/g$ and the best activity for CO oxidation. $Cu_{0.5}Mn_{2.5}O_4$ in XRD peak shows the lower activity than others. The catalytic activity over the catalyst calcined $270^{\circ}C$ displayed the highest conversion, and it was better activity comparing with Pt catalysts CO conversion.

• Journal of environmental and Sanitary engineering
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• v.2 no.3 s.3
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• pp.31-38
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• 1987

Bean sprouts is one of the popular traditional foodstuffs as a subsidiary articles of diet in Korea. As the need arise from restaurents, bean sprouts were produced by forcing culture in manufacture. In oder to prevent of the hazard' by trace metals such as Hg, Cd, Pb, Cu and Zn, the contents of these metals were analyzed. Hg, Cd, and Pb were not . detected , but the mean contents of Cu and Zn were O.33ppm and 0.356 ppm, respectively. It seems that the higher oontents of Cu and Zn in beas sprouts was the results of relative high concentration of itself. These contents has no problean in now, but the more sanitary management in manufacture and in bean producing region will be needed.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.48 no.5
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• pp.349-353
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• 1999

In this paper, to fabricate the AC power electroluminescent device (PELD) with high brightness, new structure that constructed single emissive layer between electrodes was proposed. Dielectric and phosphor material structure that constructed single emissive layer between electrodes was proposed. Dielectric and phosphor material were BaTiO3 and ZnS:Cu respectively. Fabricated AC power EL devices were estimated by optical and electrical properties of EL spectrum, brightness, CIE coordinate system, transferred charge density and EL emission wave in time domain. With above results, we found that brightness of newly proposed AC powder EL power EL device was 2754 cd/m2 at 100V, 400 Hz and compared with conventional device structure.

• Korean Journal of Medicinal Crop Science
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• v.1 no.2
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• pp.171-177
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• 1993

This experiment was conducted to select and rear the adaptable cultivar which isused for various purpose and to build a year-round cultivation using with characters of aerial part and analysis of chemical components in 28 local cultivar of Artemisia princeps Var. The growth of aerial part, which are stem length, stem diameter, no. of branch, node, leaf size and leaf pubescence, in north local cultivars was more vigorous than those of south local caltivars. Fresh weight of "Myeongcheonssuk " was highest in local caltivars, and in view of local area, local cultivars which was collected from Iri Si and Euiseong Gun was shown the highest fresh weight. Local cultivars as mentioned above had a characters with plenty of leaves, nodes and pubescence of leaf is long. In chemical components of leaves in morth cultivar, content of N, MgO, Zn, Cu, Mn was high, while $P_2O_5,\;K_2O$ in middle local cultivars, Fe in south local cultivars. The more content of carbohydrate in leaves was high, the content of $K_{2}O$ had a increasing tendency. In local cultivars which was collected form Iri Si and Euiseong Gun with the highest fresh weight, content of $N,\;P_{2}O_5,\;K_{2}O$ was high, on the other hand content of MgO, Zn, Ca, Mn, Fe, was low in leaves of Artemisia Princeps Var.

• Journal of Korean Society of Environmental Engineers
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• v.36 no.1
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• pp.67-73
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• 2014

In this study, the residual heavy metals in the mine tailings, primarily treated by soil washing, were stabilized using phosphate salts. The concentrations of residual contaminants in the washed mine tailings were As (1,861 mg/kg), Cd (20 mg/kg), Cu (56 mg/kg), Pb (2,149 mg/kg), and Zn (633 mg/kg). They were stabilized with $CaHPO_4$, $Ca(H_2PO_4)_2{\cdot}H_2O$, and hydroxyapatite at 0.1 wt%, 1 wt%, and 10 wt% for 1, 3, 5, 7, and 14 days. It was found that 1 wt% $Ca(H_2PO_4)_2{\cdot}H_2O$ was optimum in our experiments, but the stabilization duration did not affect the efficiency. After stabilization with 1 wt% $Ca(H_2PO_4)_2{\cdot}H_2O$ for 1 day, the concentrations of arsenic and heavy metals, As (0.328 mg/L), Cd (0.250 mg/L), Cu (0.143 mg/L), Pb (0.359 mg/L), and Zn (2.622 mg/L), in TCLP leachate were below the RCRA-TCLP limits, which meant the contaminants in the treated mine tailings were stably immobilized.

• Progress in Superconductivity
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• v.4 no.1
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• pp.14-18
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• 2002

We had succeeded to grow bulk sing1e crystals of La／sub 2-x／Sr／sub x／$CuO_4$by the traveling solvent floating zone method (TSFZ), and to prepare La／sub 2-x／Sr／sub x／CuO$_4$single-crystalline thick films on the Zn-doped La$_2$$CuO_4$ substrate by new liquid phase epitaxial technique using an infrared heating furnace (IR-LPE). In this paper, Ireview growth of bulk single crystals and single-crystalline thick films of La／sub 2-x／Sr／sub x／$CuO_4$, and discuss on their device properties to develop high speed integrated electronic devices.

• Asian-Australasian Journal of Animal Sciences
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• v.10 no.4
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• pp.378-384
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• 1997

The ruminal solubility of copper (Cu), manganese (Mn), molybdenum (Mo), and zinc (Zn) in eight Philippine forages was studied. These forages were: 1) grasses: paragrass (Brachiaria mutica (Forsk.) Stapf), stargrass (Cynodon plectostachyum Pilger), and napiergrass (Pennisetum purpureum Schumach.); 2) creeping legumes: calopogonium or calopo (Calopogonium muconoides Desv.) and centrocema (Centrocema pubescens Benth.); 3) tree lequmes: gliricidia or kakawate (Gliricidia sepium (Jacq.) Walp.), leucaena or ipil-ipil (Leucaena leucocephala (Lam.) de Wit.), and sesbania or katuray (Sesbania grandiflora (L.) Poir). Nylon bags with samples were incubated for 0, 3, 6, 12, 24, 48 and 72h in three rumen cannulated sheep fed with timothy hay (Phleum pratense L.) at 2% body weight/d. The 0-h bags were washed with deionized water. There were species differences (p < 0.05) on the different solubilities of trace elements. At O-h incubation, the trend of solubility was Mo (54%) > Zn (43%) > Cu (38.7%) > Mn (29.5%). At 3-h incubation, all the elements except Mn had an average solubility above 50%. Combining particulate passage rate (1.9%/h) and various trace elements disappearance rates, the effective ruminal solubilization (ERS) of trace elements were computed. The ERS across species ranged from 44.6 to 89.9% for Cu, 29.9 to 84% for Mn, 66 to 95.1% for Mo, and 30.1 to 82.3% for Zn resulting to a trend of Mo > Zn > Cu > Mn.

• Analytical Science and Technology
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• v.11 no.6
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• pp.440-447
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• 1998

Polydentate Schiff base ligands 5-Br-BSDT(bis(5-bromosalicylaldehyde)diethylenetriamine) having $N_3O_2$ atoms, 5-Br-BSTT(bis(5-bromosalicylaldehyde)triethylenetetramine) having $N_3O_2$ atoms, 5-Br-BSTP(bis(5-bromosalicylaldehyde)tetraethylenepentamine) having $N_3O_2$ atoms were synthesized. Stability constants of the complexes between these ligands and the metal ions such as Cu(II), Ni(II) and Zn(II) were measured in DMSO by a polarographic method. It was observed that all metal(II) ions employed in this study formed 1 : 1 complexes with Schiff base ligands. Stability constants for the ligands were in the order of Cu(II)>Ni(II)>Zn(II), and for complex formation were in the order of 5-Br-BSTP>5-Br-BSTT>5-Br-BSDT according to the increasing in the number of donor atoms. Both enthalpy and entropy changes are obtained in negative valves. Exothermicity for the complex formation indicated tight binding between the ligands and metal ions. The negative entropy change would be related to the fact that solvent molecules are strongly interacting with the metal complexes.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.08a
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• pp.218-218
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• 2011

The CIGS Solar Cells have the highest conversion efficiency in the film-type solar cells. They consist of p-type CuInSe2 film and n-type ZnO film. The CdS films are used as buffer layer in the CIGS solar cells since remarkable difference in the lattice constant and energy band gap of two films. The CdS films are toxic and make harmful circumstances. The CdS films deposition process need wet process. In this works, we design and make the hitter and lamp reflection part in the sputtering system for the ZnS films deposition as buffer layer, not using wet process. Film thickness, SEM, and AFM are measured for the uniformity valuation of the ZnS films. We conclude the optimum deposition temperature for the films uniformity less than 1.6%. The ZnS films deposited by the sputtering system are more dense and uniform than the CdS films deposited by the Chemical Bath Deposition Method(CBD) for the CIGS Solar Cells.

• Journal of Periodontal and Implant Science
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• v.24 no.1
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• pp.39-49
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• 1994

It has been believed that antioxidant enzymes such as CuZn- and Mn-superoxide dismutase and catalase protect the tissue from damage resulting from the oxygen derived free radicals($O_2\;^-$, $H_2O_2$ and OH ). The purpose of this study was to investigate the relationship between activity of antioxidant enzymes including CuZn- and Mn- superoxide dismutase and catalase and inflammatory periodontal disease and periodontal parameters. For this study, the patients were classified into normal, gingivitis, adult periodontitis and rapidly progressive periodontitis, and then their papillary bleeding index(PBI) and probing depth were checked. Gingival tissues were surgically obtained from the patients during periodontal surgery, extraction, and clinical crown lengthening procedure. The activity of CuZn- and Mn- superoxide dismutase and catalase in the gingival tissues was measured by using UV-spectrophotometer by the same methods as Crapo et al. And Aebi did, respectively. The results were as follows : 1. CuZn- and Mn- and total-superoxide dismutase activity were significantly low in rapidly progressive periodontitis group in comparison to normal group (P<0.05). 2. In comparison of the antioxidant enzyme activity according to papillary bleeding index group(PBI), Mn-superoxide dismutase activity only was significantly lower in PBI 2, 3, and 4 groups than PBI 0 group(P<0.05). 3. Superoxide dismutase activity failed to show any significant difference according to probing depth. But significant]y high catalase activity was shown in deep pocket group (${\ge}7mm$)(P<0.05). In conclusion, these results suggest that the activity of Mn-superoxide dismutase among the antioxidant enzymes may reflect the inflammatory status of gingival tissue and that the decreased activity of superoxide dismutase may be one of responsibe factors for progression of rapidly progressive periodontitis.