• Title/Summary/Keyword: 마스틱

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Development of Newly Formulated High-strength Wash Primer for Membrane LNG Carrier (멤브레인형 LNG 운반선용 고강도 워시프라이머 개발)

  • Song, Eun-Ha;Lee, Sung-Kyun;Chung, Mong-Kyu;Baek, Kwang-Ki
    • Special Issue of the Society of Naval Architects of Korea
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    • 2007.09a
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    • pp.48-56
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    • 2007

  • Wash primer was applied to cargo tank of Membrane-LNG Carrier (M-LNGC) for corrosion resistance and high bond-strength with the mastic. However, a lack of bond-strength verification at high thickness wash primer coating resulted in strict coating thickness control. Therefore wash primer was controlled below DFT(Dry Film Thickness) $30{\mu}m$. In order to develop the wash primer satisfying GTT (GAZ TRANSPORTAION TECHNIGAZ) standard even at high thickness, we evaluated coating properties such as wash primer/mastic bond-strength, corrosion resistance, as well as workability for the newly formulated wash primer materials. The newly formulated wash primer had high bonding-strength to mastic even at high thickness and had proper corrosion resistance and workability suitable to yard condition.

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Status of intestinal parasite infections in inhabitants of Palmar, Guavas Province, Ecuador (에꽈돌국 과야스주 빨말 본당 지역 주민의 장내 기생충 감염상태)

  • Jo, Seung-Yeol;Kim, Jung-Ho;Park, Seong-Hak
    • Parasites, Hosts and Diseases
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    • v.28 no.2
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    • pp.109-114
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    • 1990

  • Status of intestinal protozoan and helminthic infections was surveyed in mestizo population living in rural parish of Palmar and its nearby recintos(villages) , Three of the surveyed villages were at the Pacific coast and 5 villages were in inner pasture land, located about 100 km west of Guayaquil, the second largest city in Ecuador. One stool sample was examined by one cellophane thick smear for helminth ova and one direct smear stained with Lugol's iodine solution for protozoan cysts. Of 325 persons examined, 66.1% were positive for any ova or cyst. The positive rates were: 18.1% for Ascaris lumbricoides, 19.4% for Trichuris trichiura, 0.6% for hookworm, 3.7% for Hyntenolepis nana, 1.8% for Taenia sp., 19.4% for Entnmoeba histolytica, 28.6% for Entamoeba coli, 5.5% for Endolimax nasa, 1.5% for ledamoeba buetschlii, 11.l% for eiardia lamblia and 0.6% for Chilomastix mesnili. Poor supply of potable water was considered the main cause of high prevalence of intestinal protozoan infections.

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