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崔斗文,朴元圭 공주대학교 사범대학 과학교육연구소 1987 과학교육연구 Vol.19 No.1
忠南 防葛里 火電建設 周邊의 植生과 生物相을 調査하였다 1. 이 地域은 西海에 ??出된 丘陵地로 海潮風이 基하고 大部分 곰솔 造林地이다. 2. 造林으로는 곰솔 群落, 아까시나무 群落, 잎갈나무 群落, 미루나무 群落이 있다. 二次林으로는 소나무 群落과 떡갈나무 群落, 졸참나무 群落 等의 참나무(Quercus)群落이 있다. 自然林으로는 소나나무 群落, 팽나무 群落, 느티나무 群落 等 이 發達되어 있었던 것으로 생각된다. 3. 植物目錄은 35目 89科 256 屬 402 種類이다. 4. 이 地域은 植物相이 單調로워 天然記念物이나 要保護種은 거의 없다. This survey was carried out from may, 1987 to October, 1987 over the 8 sites of the investigation. The results of the investigation are follows: 1. The sites of investigation are hilly districts near the coast of Whanghae with severly current wind. The forests in these sites mainly consist of afforestation of Pinus thunbergii. 2. The afforestation are classified in detail: Pinus thunbergii Community; Robinia pseudo-acasia Community; Larix lepto lepis Community; and Populus deltoides Community. The secondary forests consist of Pinus densiflora Community and Quercus Community, but the Quercus Community consists of Quercus dentata and Quercus serrata. The other three Communities such as Carpinus coreana Community, Celtis sinensis Community, and Zelkova serrata Community may be regard as advanced Natural Forest. 3. The flora are investigated to have 35 Others, 89 Families, 256 Genera, and 402 Species. 4. There seem to have no plants protacted as natural monuments and to have no rare species in the investigated sites.
저농도 탄산 칼시움(Ca)슬러리의 여과저항에 미치는 농도의 영향
박원규,강석호 한국화학공학회 1966 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.4 No.1
The Korean diatomaceous earths as a filter aid is under the research. The American Decalite Speedplus as a standard to be compared with the natives was precoated on two kinds of filter-media to filter the dilute calcium carbonate slurry. The one filter-medium, glass filter, was used, but had poor reproducibility of its glass pores. The other filter-medium, a Bu¨chner filtering funnel covered with a kind of plain-weaved nylon cloths, was appreciable for the vacuum filtration of the slurry. The mean specific cake resistance α and the filter-medium resistance R for these media were observed in the range of the slurry concentration from 0.1% to 1.0% by weight. According to the gradual increasing of the CaCO_3 slurry concentrations, the mean specific cake resistance α are decreased and the filter medium resistances R are increased. As far as the thickness of the filter cake formed is of the range from 0.4cm to 1.5cm, the R/α ratios for the non-precoated glass filter are varied from 0.10 to 0.30, for the non-precoated nylon cloths and Bu¨chner funnel; from 0.05 to 0.40, and for the precoated nylon cloths and Bu¨chner funnel; from 0.05 to 0.20, respectively.
유리탱크로의 구조변경에 따른 열정산계산 및 유리품질 비교
이선영,김종옥,임대영,김택남,박원규 培材大學校 1997 培材論叢 Vol.2 No.-
In order to make good quality glass in glass tank furnace, the geometrical dimensions such as melting area, length to width ratio, glass depth, checker height must be carefully considered on the basis of construction and operational requirements. The purpose of this research was to find the effects of changing melting capacity on the glass quality and energy savings in glass tank furnace. The size of glass tank furnace was changed from 15' X 24' to 15' X 26', the checker height of regenerator from 8.05 m to 10.3 m, glass depth of furnace from 864 mm to 950 mm. The glass quality and heat balance was observed and measured by various methods such as oxygen detect, temperature measurements etc. The results are as follows (1) Melting capacity is increased from 70 ton/day to 75 ton/day. (2) Hot spot moved to 0.9 m to throat and the glass melting depth is increased from 34" to 37". This is due to the increase of melting capacity. (3) Energy efficiency increased about 1.13 % after changing melting capacity and the energy loss due to the exhausted gas was reduced. (4) Number of seed was reduced from 1.5 to 1.1 after changing the glass tank furnace. This implied that glass quality was increased.
연마방법에 따른 금속의 활택도에 관한 연구 - Atomic Force Microscope를 이용한 -
박원규,우이형,최부병,이성복,Park Won-Kyu,Woo Yi-Hyung,Choi Boo-Byung,Lee Sung-Bok 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.1
The surface of metals should be as smooth as possible for optimum comfort, oral hygiene, low plaque retention, and resistance to corrosion. In this study five specimens of each precious metal(type III gold alloy, ceramic gold alloy, and Ag-Pd alloy) were divided into five groups according to finishing and polishing procedures : group 1(sandblaster), group 2(group 1+stone), group 3(group 2+brown rubber), group 4(group 3+green rubber), and group 5(group 4+rouge). Six specimens of each non-precious metal(Co-Cr alloy, Ni-Cr alloy, and Co-Cr-Ti alloy) were divided into six groups: group 1(sandblaster), group 2(group 1+hard stone), group 3(group 2+electrolytic polisher), group 4(group 3+brown hard rubber point), group 5(group 4+green hard rubber point), and group 6(group 5+rouge). Considering factors affecting the rate of abrasion, the same dentist applied each finishing and polishing procedure. In addition, the surface roughness of enamel, resin, and porcelain was evaluated. The effect of finishing and polishing procedures on surface roughness of precious and non-precious metals, enamel, resin, and porcelain was evaluated by means of Atomic Force Microscope(AutoProbe CP. Park Scientific Instruments, U.S.A.) that can image the three dimensional surface profile and measure average surface roughness values of each sample at the same time. The obtained results were as follows : 1. According to finishing and polishing procedures, the surface roughness of type III gold alloy, ceramic gold alloy, and Ag-Pd alloy was decreased in the order of group 1, 2, 3, 4, and 5 (P<0.01). 2. According to finishing and polishing procedures. the surface roughness of Co-Cr alloy, Ni-Cr alloy, and Co-Cr-Ti alloy was decreased in the order of group 1, 2, 3, 4, 5, and 6 (p<0.01). 3. There was not statistically significant difference in the surface roughness among three metals of precious metals in group 1 but was significant difference in group 2, 3, 4, and 5 (P<0.05). 4. There was not statistically significant difference in the surface roughness among three metals of non-precious metals in all groups. 5. When the surface roughness of the smoothest surface of each metal, enamel. porcelain, and resin was compared, porcelain was the smoothest and the surface roughness was decreased in the order of Ni-Cr alloy. Co-Cr alloy. Co-Cr-Ti alloy, resin. Ag-Pd alloy, ceramic gold alloy type III gold alloy, and enamel (P<0.01). The results of this study indicate that the finishing and polishing procedures should be carried out in a logical, systematic sequence of steps and the harder non-precious metals may be less resistance to abrasion than are the softer precious metals.