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Thermocouple을 이용한 Buchanan Plugger 표면의 온도상승 분석
조진숙,황윤찬,김선호,황인남,최보영,정영진,정우남,오원만 전남대학교 치의학연구소 2003 구강과학 Vol.15 No.4
This study was performed to confirm the actual temperature rise on the surface of Buchanan plugger by evaluating the temperature rise on the surface of it, the peak temperature of pluggers of various size using thermocouple. The heat carrier system 'System B Heatsource' (Model 1005, Analytic Technologies, USA) and the Buchanan pluggers of F, FM, M and ML sizes are used for this study. The temperature was set to 200 which Dr. Buchanan's "Continuous wave of condensation" technique recommended on digital display and the power level on it was set to 10. The touch mode was used. Five thermocouples were placed in direct contact with the surface of each size of Buchanan's pluggers at 1 ㎜ increments from the tip to the 4 ㎜ length of shank. Each thermocouple was secured with cyanoacrylate adhesive and orthodontic resin block. The two wire leads of each thermocouple were connected to the appropriate channels of Data Logger. This was configured to simultaneously record input from the five thermocouples. The heat control spring was touched for 1, 2, 3, 4 and 5 seconds, and the temperature rise on the surface of the pluggers were measured at 1 sec intervals for more than 5 seconds with an accuracy of 0.01. Ten trials was determined for each plugger. The average of temperature rise and standard deviation was calculated for each size of plugger. The data were statistically analyzed by one-way ANOVA to determine their significance. The results as follows. 1. The position at which the temperature peaked was approximately at 1∼2㎜ far from the tip of Buchanan plugger (p<0.01). 2. The peak temperature was 215.25±2.28℃ in F plugger, 185.94±2.19℃ in FM plugger, 169.51±9.12℃ in M plugger, and 160.79±1.27℃ in ML plugger and the peak temperature was highest in F type and followed by, in descending order, FM type, M type. ML type showed the lowest peak temperature (p<0.01). This results suggest that the actual temperature on the surface of the pluggers does not correlate well with the temperature set on digital display. Heat concentrates around the tip. The larger plugger reveals lower temperature rise relatively.
연속회분식 활성오니법에 의한 하수의 오염물질 제거에 관한 연구
남영우,백윤재 崇實大學校 2000 論文集 Vol.30 No.1
A fundamental study on SBR process was carried out to remove nitrogen and phosphorus in waste water that are known to be hard to eliminate by the conventional activated sludge process. A SBR pilot plant was operated under various operating conditions over six months using waste water feed sampled from a wastewater treatment facility at K city in Kyungki-do. Removal efficiencies were evaluated with five water quality items(BOD, COD, SS, T-N, and T-P). Under the operating conditions employed in this study, the BOD and COD removal efficiencies for the pilot plant was 78.3% and 93.0%, respectively. The removal efficiencies for the rest of the items were 97.3% for SS, 56.3% for T-N, 52.8.% for T-P, respectively. The effluent water quality processed by SBR met the regulation of the Effluent Water Quality Standard on Korean Standard Methods. The adopted crown-turbine SBR process turned out to be similar to the PID, DNR, and B3 process in removal efficiencies. For the wastewater treatment capacity of 5,000 m3/day, the operating cost of the crown-turbine SBR unit was 15% less than that of the conventional activated sludge processing unit while the capital costs of both units were similar to each other.
南潤子 건국대학교 1977 論文集 Vol.5 No.1
With a Epidermophyton flaccosum, Trichophyton rubrum, and Trichophyton mentagrophytes which belongs to dermatophytes genus, this study was initiated to investigate their utilization of the wool, cotton, and nylon fiber as a nutrient source, and to investigate the degree of damage by the fungi and further to understand the inhibitory effects of the dye on the growth and development of the fungi. The results are : 1.There was no relationships between the C-and N-source of each fiber and the growth of E. floccosum, T. mentagrophytes, and T. rubrum. 2.E. floccosum, T. mentagrophytes, and T. rubrum grew well in the wool and did not grow in cotton and nylon which was amended by the 0.1 per cent yeast extract solution media. 3.Therefore, wool was greatly damaged by the fungi. 4.The level of inhibitory effect on the fungal growth and development influenced by the dye concentrations was 2 per cent by Acid Neolan Brown, 0.5 per cent by Chrome Black BT, and 0.25 per cent by Direct Bordeaux B.
PDMS-PU 탄성체의 합성과 물성 및 Zwitterionization에 관한 연구
윤정욱,왕은진,백남철 慶熙大學校 材料科學技術硏究所 1992 材料科學技術硏究論集 Vol.5 No.-
The mechanical properties of polyurethane elastomer synthesized from hydroxybutyl-terminated polydimethylsiloxane(PDMS) of molecular weight 1000 and 4,4'-methylene diphenyldiisocyanate(MDI) were investigated. Hard segment content varied from 33% to 56% and various chain extender with 1,4-butanediol(BD), N-methyldiethanolamine(MDEA) or ethylene diamine(ED) were used in the segmented polyurethane block copolymer. The MDEA-extended materials were zwitterionized by using 1,3-propane sultone. By using gel permeation chromatography, infrared spectroscopy, differential scanning calorimetry and universal tensile Testing machine, physical and thermal properties of these polymers were investigated. All of these polyurethane elastomer showed phase separation. BD-extended material shows a higher tensile strength for the higher hard segment content material. MDEA-extended materials which were ionized by 1,3-PS exhibited better tensile properties than un-ionized copolymer. The zwitterionomer material exhibited ionic aggregation within the hard domain. Hard domain cohesion was found to be a important factor in determining the tensile properties of the elastomers.