• 제목/요약/키워드: WET

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침적 모형에 의한 습성침적 플럭스 수치모의 (Numerical simulation of wet deposition flux by the deposition model)

  • 이화운;문난경;임주연
    • 한국환경과학회지
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    • 제11권12호
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    • pp.1235-1242
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    • 2002
  • The purpose of this study is to estimate wet deposition flux and to investigate wet deposition characteristics by using the ADOM model. Wet deposition flux of highly reactive $SO_2$ is estimated by applying observed meteorological parameters and concentrations of chemical species to the ADOM model. Wet deposition is largely dependent on large scale precipitation and cloud thickness. Wet deposition flux of sulfate depends on $SO_2$ oxidation in clouds. When large amount of $SO_2$ is converted to sulfate, deposition flux of sulfate increases, but wet deposition flux of $SO_2$ is small. On the whole, the pattern of sulfate wet deposition flux agrees with the typical pattern of sulfate wet deposition that is high in the summer(July) and low in the winter(January).

영종도와 삼목도에 도래하는 섭금류(Shorebirds)의 간과 신장에서 중금속 농도 (Heavy Metal Concentration in Liver and Kidney of Shorebirds Migrating to Yeongjong and Sammok Islands)

  • 김정수;박성근;이두표;구태회;원병오
    • The Korean Journal of Ecology
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    • 제27권4호
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    • pp.193-198
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    • 2004
  • 본 연구는 우리나라 영종도와 삼목도에 도래하는 섭금류(Shorebirds)의 간과 신장에서 중금속 축적에 대한 연구이다. 아연의 농도는 영종도의 큰뒷부리도요의 간과 신장에서 각각 76.7 ㎍/wet g, 65.8 ㎍/wet g으로서 가장 높은 농도를 보였다. 망간의 경우, 간에서 가장 높은 농도는 4.68㎍/wet g을 나타낸 영종도의 청다리도요였고, 신장에서는 삼목도의 흰물떼새에서 18.61㎍/wet g으로 가장 높았다. 구리농도는 영종도 큰뒷부리도요의 간과 신장에서 각각 25.4 ㎍/wet g과 44.1 ㎍/wet g으로 가장 높았다. 납 농도가 가장 농도가 높게 나타난 종은 삼목도의 좀도요로서 간에서 17.0 ㎍/wet g, 신장에서 40.2 ㎍/wet g이었다. 그리고 납 농도는 모든 종에서 신장에서의 농도가 간에서의 농도보다 높게 나타났다. 간에서 카드뮴 농도는 0.73±0.26㎍/wet g을 나타낸 영종도의 민물도요에서 가장 높았고, 신장에서는 영종도의 흰물떼새에서 4.89±1.49 ㎍/wet g으로 가장 높았다. 카드뮴은 모든 종에서 간보다는 신장에서 농도가 높았다. 그리고 간과 신장에서의 납과 카드뮴 농도는 붉은어깨도요를 제외하고는 영종도에서의 농도가 삼목도보다 높았다.

TMCP강의 습식수중 아크용접부의 냉각특성 개선에 관한 연구 (Study on Cooling Characteristic Improvement in Underwater Wet Arc Welding of TMCP Steelplate)

  • 김민남
    • 한국해양공학회지
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    • 제6권2호
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    • pp.113-124
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    • 1992
  • The offshore industry created a need for quality wet weld repairs. Wet welding is a fast method of repair providing sound, structural quality welds. It requires less support equipment than a similar underwater dry weld repair or the alternative mechanical connections. Compared to welds made in air, underwater wet welds are plagued by increased hardness due to rapid quenching by the surrounding water. In this paper is described the experimntal study of improving the cooling rates of wet welds of TMCP steel plate by shielding around weld arc surroundings. The principal results of this experimental investigation can be summarized as follows : By shielding around weld arc surrounding, the cooling rates resulting from wet welds on TMCP steel plate could be lower than that of nonshielded wet welds and the fesibility on high quality of mecanical properties of wet weld on TMCP steel plate was carried out with shielded weld arc surrounding.

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기판의 왕복 운동을 이용한 인라인 식각세정장치 내 ITO 식각특성 (ITO Wet Etch Properties in an In-line Wet Etch/Cleaning System by using an Alternating Movement of Substrate)

  • 홍성재;권상직;조의식
    • 한국전기전자재료학회논문지
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    • 제21권8호
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    • pp.715-718
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    • 2008
  • An in-line wet etch/cleaning system was established for the research and development in wet etch process. The system was equipped with a reverse moving system for the reduction in the size of the in-line wet etch/cleaning system and it was possible for the glass substrate to be moved back and forth and alternated in a wet etch bath. For the comparison of the effect of the normal motion and that of the alternating motion on the in-line wet etch process, indium tin oxide(ITO) pattern was obtained through both wet etch process conditions. The results showed that the alternating motion is not inferior to the normal motion in etch rate and in etch uniformity. It is concluded that the alternating motion is possible to be applied to the in-line etch process.

습부 압착과 건조 조건이 종이의 해리 특성 및 물성에 미치는 영향 (Effects of Wet Pressing and Drying Conditions on Disintegration and Physical Properties of Paper)

  • 김은영;원종명
    • 펄프종이기술
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    • 제35권2호
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    • pp.12-17
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    • 2003
  • The effects of wet pressing and drying conditions on the disintegration and physical properties of paper were investigated in order to get the basic information on the resistance of paper for aqueous solution during converting processes. Wet pressing of unbeaten bleached softwood kraft pulp increased WRV at the range of grammage investigated. The increase of WRV with grammage at low wet pressing pressure(50 psi) was obvious, while it was not significant at higher wet pressing pressure(110 psi). The changes of WRV by drying were affected by the grammage and wet pressing pressure. The poorer disintegration of sheet, the higher wet pressing pressure and drying temperature. Although the strength properties were increased with the grammage, wet pressing pressure and drying temperature, results showed different trend from those of beaten pulp.

Physicochemical and microbial characteristics of longissimus lumborum and biceps femoris muscles in Korean native black goat with wet-aging time

  • Ali, Mahabbat;Park, Ji-Young;Lee, Seong-Yun;Choi, Young-Sun;Nam, Ki-Chang
    • Journal of Animal Science and Technology
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    • 제63권1호
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    • pp.149-159
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    • 2021
  • This study examined the effects of different wet-aging times on the physicochemical characteristics and microbial profile of longissimus lumborum (LL) and biceps femoris (BF) muscles from Korean native black goat (KNBG) meat. The water holding capacity (WHC), pH, cooking loss, shear force, meat color, free amino acid, total bacteria, and coliform count of KNGB meat were analyzed at 0, 5, 10, and 15 days of wet-aging at 4℃ under vacuum packaging. The results showed that different wet-aging times led to significant pH variations between the muscles throughout the aging period. The wet-aging time did not affect the WHC and cooking loss in meat from the LL muscle. In the BF muscle, however, meat wet-aged for five days had a significantly higher WHC and less cooking loss than meat aged for 0, 10, and 15 days. The meat from the LL muscle wet-aged for five days produced tenderer meat (low shear force value) than the unaged meat (p < 0.05). Moreover, the color was similar in the LL muscle regardless of the number of aging days. In the BF muscle, the redness (a*) was higher in the meat wet-aged for 15 days compared to that aged for 0, 5, and 10 days (p < 0.05). Regardless of the muscles, an increase in wet-aging time led to an increase in the total free amino acids contents in both muscles (p < 0.05). On the other hand, the tasty/bitter amino acid ratio was significantly higher for five days of wet-aged meat than 10 and 15 days of aging from the BF muscle. In addition, regardless of the muscles, the total bacteria and coliform counts were significantly lower for five days of wet-aged meat than 10 and 15 days of aging (p < 0.05). Therefore, chevon wet-aged for five days is an optimal aging period under vacuum packaging that fortifies meat quality with a minimal microbial negative defect.

일지역 후기 학령기 남자 아동의 몽정에 대한 지식 정도 (Knowledge of Nocturnal Emissions in Late Elementary School Boys in Incheon)

  • 이용화
    • 부모자녀건강학회지
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    • 제12권1호
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    • pp.77-87
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    • 2009
  • Purpose: The purpose of this study was to determine the knowledge of nocturnal emissions, or wet dreams and to provide information for developing a wet dream education program for elementary school boys. Method: The research design was a descriptive study through questionnaires. Data was collected from May 10, 2009 to May 20, 2009. A total of 197 late elementary school boys in Incheon, Korea participated in this study. Data was analyzed using the SPSS WIN 15.0 program. Result: The results of this study were as follows; Knowledge of wet dreams in late elementary school boys was low; The mean of the information about wet dreams was 14.00 on a 100 point scale; There were significant differences of knowledge regarding wet dreams according to the educational experience at 6 items and wet dreams experience at 12 items of total 21 items. This indicates that present education for wet dreams is not efficient and does not provide appropriate information when they need practical information. Conclusion: Self education learning program for wet dreams should be developed for late elementary school boys which includes different contents and time required for further study, evaluation and assessment.

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Thermodynamic and Aerodynamic Meanline Analysis of Wet Compression in a Centrifugal Compressor

  • Kang, Jeong-Seek;Cha, Bong-Jun;Yang, Soo-Seok
    • Journal of Mechanical Science and Technology
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    • 제20권9호
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    • pp.1475-1482
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    • 2006
  • Wet compression means the injection of water droplets into the compressor of gas turbines. This method decreases the compression work and increases the turbine output by decreasing the compressor exit temperature through the evaporation of water droplets inside the compressor. Researches on wet compression, up to now, have been focused on the thermodynamic analysis of wet compression where the decrease in exit flow temperature and compression work is demonstrated. This paper provides thermodynamic and aerodynamic analysis on wet compression in a centrifugal compressor for a microturbine. The meanline dry compression performance analysis of centrifugal compressor is coupled with the thermodynamic equation of wet compression to get the meanline performance of wet compression. The most influencing parameter in the analysis is the evaporative rate of water droplets. It is found that the impeller exit flow temperature and compression work decreases as the evaporative rate increases. And the exit flow angle decreases as the evaporative rate increases.

습식 신선공정 해석 및 단선율 저감을 위한 패스 재설계 (Analysis of wet Wire Drawing Process and Pass Redesign to Reduce Wire Breakage)

  • 이상곤;김민안;김병민
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2002년도 춘계학술대회 논문집
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    • pp.1034-1037
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    • 2002
  • Wet wire drawing process is used to produce fine wire in the industrial field. The production of fine eire by using wet wire drawing process with appropriate dies pass schedule would be impossible without understanding of relationship between process parameters such as material properties, dies reduction, friction conditions, drawing speed etc. However, up to new, dies pass schedule of wet wire drawing process has performed by trial and error of expert. Therefore, this study investigates the relationship between process parameters quantitatively and analyzes a conventional wet wire drawing process. Using the results, the conventional pass schedule can be redesigned to reduce the wire breakage during wet wire drawing. To verily the result of this study, the wet wire drawing experiment was performed. And the results between conventional process and redesigned pass schedule were compared. As the comparison of results, the wire breakage was considerably reduced in the redesigned pass schedule more than conventional pass schedule.

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고장력강의 습식 수중 아크용접에 대한 냉각율과 기계적 특성에 관한 연구 (Study on Cooling Rates and Mechanical Properties of H.T. Steel Plates in the Underwater Wet arc welding)

  • 김민남
    • 한국해양공학회지
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    • 제2권1호
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    • pp.125-134
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    • 1988
  • The feasibility for improving the cooling rates and mechanical properties of wet welding process is experimentally investigated by using new developed underwater wet electrodes and H.T. steel plates. Main results of this experimental study can be summarized as follows; 1) By shielding around weld arc surrounding, the cooling rates resulting from wet welds with developed electrodes on TMCP steel plates can be lower than of non-shielded wet welds. 2)A high quality of mechanical properties of wet welds on TMCP steel plates can be obtained with shielded weld arc surrounding.

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