• Title, Summary, Keyword: 건침적

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Influence of Radioactive Contamination to Agricultural Products Due to Dry and Wet Deposition Processes During a Nuclear Emergency (원자력 사고 중 핵종의 건. 습침적에 따른 농작물 오염 영향)

  • Hwang, Won-Tae;Kim, Eun-Han;Suh, Kyung-Suk;Han, Moon-Hee;Choi, Pong-Ho;Lee, Chang-Woo
    • Journal of Radiation Protection and Research
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    • v.27 no.3
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    • pp.165-170
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    • 2002
  • Combined with deposition model onto the ground of radionuclides, the influence of radioactive contamination to agricultural products was analyzed due to wet deposition as well as dry deposition from radioactive air concentration during a nuclear emergency. The previous dynamic food chain model, in which initial input parameter is only radionuclide concentrations on the ground, was improved for the evaluating of radioactive contamination to agricultural products from either radionuclide concentrations in air or radionuclide concentrations on the ground. As the results, in case of deposition onto the ground, wet deposition was more dominant process than thy deposition. While the contamination levels of agricultural products were dependent on the a variety of factors such as radionuclides and rainfall rate. It means that the contamination levels of agricultural products are determined from which is more dominant process between deposition on the ground and interception onto agricultural plants.

Development and Application of Dry Deposition Sampler (건성침적장치의 개발동향과 그 응용)

  • 이승묵
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • pp.346-350
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    • 1999
  • 보통 건식 침적과 습식 침적으로 구분되는 대기 침적은 지난 수년간 침적된 물질이 환경에 미치는 영향에 대한 관심으로 인하여 많은 연구가 이루어졌다. 대기 침적은 대기로부터 자연계의 표면들까지 대기중 유해물들이 미치는 영향과 그들의 이동을 조절하는 중요한 기작의 하나이다. 예를 들면, 미시건 호수(Lake Michigan)에서 현재 각각 납과 PCB (Poly Chlorinated Biphenyl)의 부하 중 약 95 %와 58%가 대기 침적에서 유래되었다고 보고되었다.(중략)

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Iodine Deposition onto the Chinese Cabbage (요오드의 배추에 대한 침적)

  • Lee, Han-Soo;Choi, Heui-Joo;Kang, Hee-Suk;Yu, Dong-Han;Keum, Dong-Kwon;Lim, Kwang-Mook;Park, Hyo-Kook;Choi, Yong-Ho;Lee, Chang-Woo
    • Journal of Radiation Protection and Research
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    • v.29 no.3
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    • pp.173-177
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    • 2004
  • The Chinese cabbage, being one of the principal foodstuffs in Asian countries, is tested for iodine exposure. As a radioactive source, iodine-125 of which the radiological half life is 60 days was used to measure the concentration change. Experiments were carried out four times with different times of exposure. The iodine source was prepared by the chemical reaction of NaI in order to avoid producing relatively large iodine which might be generated In the case of crystal evaporation. The deposition velocity was obtained from the integrated air concentration and surface concentration of the Chinese cabbage. The environmental half life was also calculated.

Performance characteristics of the Coil Deposition Type Heat Pump using Geothermal Energy (지열을 이용한 코일 침적형 히트펌프의 성능 특성)

  • Oh, Hoo-Kyu;Lee, Dong-Gun;Jeon, Min-Ju;Son, Chang-Hyo
    • Journal of the Korean Society of Marine Engineering
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    • v.36 no.4
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    • pp.437-444
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    • 2012
  • This paper describes the experimental characteristics on cooling and heating performance of the coil deposition type heat pump using geothermal energy to optimize the design for the operating parameters of this system. The operating parameters considered in this study include subcooling degree, evaporation and condensation temperature in the coil deposition type heat pump using geothermal energy. The main results are summarized as follows : As the evaporation temperature and subcooling degree of the coil deposition type heat pump using geothermal energy increases, and the condensation temperature decreases, the COP of this system increases. The subcooling degree, evaporation and condensation temperature of the coil deposition type heat pump have an effect on cooling and heating COP of this heat pump. Therefore, it is a necessary to determine the optimum operation conditions for the highest COP of this heat pump presented in this study.

배출원 주위 대기 중의 다이옥신 분포 및 배출원과의 관계

  • 오정은;최진수;양윤희;김병훈;장윤석
    • Proceedings of the Korea Air Pollution Research Association Conference
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    • pp.275-276
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    • 2000
  • 소각로에서 배출되는 다이옥신은 위해성 문제로 논란이 계속되고 있으며 현재 국내 도시 소각로의 경우 배출 기준치를 만족시켜야 하는 둥의 규제를 받고 있다. 또한 앞으로는 사업장소각로에서도 다이옥신 정기 측정이 의무화되는 등 배출원에서의 다이옥신 관리가 점차 더 강화될 예정이다. 이처럼 소각로에서 배출된 다이옥신은 대기 중 확산 및 이송과정에서 건·습식 침적과정을 통해 각 환경매체로 재분포되어 생물체에 농축 및 최종적으로는 인체로 유입되기도 한다. (중략)

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A Study on the Chloride Ion Diffusion Coefficient of Concrete by Submergence in Salt Water (침적시험에 의한 콘크리트의 염소이온 확산계수 평가)

  • 김동석;양승규;정연식;유재상;이종열;본간건일
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.297-300
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    • 2003
  • A chloride is an important deteriorating factor which governs the durability of the reinforced-concrete structures under marine environments. Also, the main penetration mechanism of chloride ion into concrete is a diffusion phenomenon. In this study, It is evaluated the diffusion coefficient of chloride ion in non-steady state by Fick's second law. Submergence method in salt water carried out in this experiment. Two types of cement which is different in mineral composition were used. In addition, the effect of mineral admixtures of blast-furnace slag and meta-kaolin was studied. In conclusion, the diffusion coefficient of chloride ion is much affected according to cement type and mineral admixtures, also, it is proved that meta-kaolin as well as blast-furnace slag is effective in preventing penetration of chloride ion.

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A study on the powder synthesis of the amorphous calcium carbonate precursor for phosphors by wet chemical method (습식법에 의한 형광체 제조용 비정질 탄산칼슘 전구체 분말의 합성에 관한 연구)

  • 최종건;김판채;이충효
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.10 no.4
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    • pp.302-308
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    • 2000
  • Stable amorphous calcium carbonate were synthesized from the serial work for the synthetic conditions such as concentration of solution, reaction temperature, aging time and pH of mother liquor. By using this as a precusor, calcite, aragonite and vaterite crystal particles were obtained in the water from adequate crystallization conditions. Furthermore, characterization for flourescence were performed by using crystals which were crystallized from the Sn dopped amorphous calcium carbonate. Calcite showed the most intensive emission and the center of emission wavelength was 464 nm with pure blue color. Calcite is expected to be used as phosphor for flourescent lamp because the maximum emission intensity was obtained from the excitation with 255 nm wavelength.

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