• 월간산업보건
• /
• s.55
• /
• pp.22-26
• /
• 1992

• KOREAN ASSOCIATION OF OCCUPATIONAL HEALTH NURSES
• /
• v.3 no.1 s.7
• /
• pp.20-24
• /
• 1996

• 월간산업보건
• /
• s.337
• /
• pp.35-39
• /
• 2016

• 월간산업보건
• /
• s.50
• /
• pp.43-45
• /
• 1992

• 월간산업보건
• /
• s.85
• /
• pp.54-55
• /
• 1995

• 월간산업보건
• /
• s.109
• /
• pp.30-34
• /
• 1997

• 월간산업보건
• /
• s.81
• /
• pp.47-48
• /
• 1995

• Journal of the Korean Magnetics Society
• /
• v.6 no.4
• /
• pp.251-257
• /
• 1996

A coercivity of barium ferrite (BaM) tape was found to be higher than the coercivity of BaM powder, This difference is in the range of 50 Oe to 600 Oe, which depends on substituted cations. physical properties of powder, and preparation conditions of the tape. The coercivity difference is attributed to both particle stacking and adsorption of organic solvent on particle surface. Regardless of substituted cations, the coercivity of longitudinally oriented BaFe tape was higher than that of BaM powder by a range of 100 Oe to 120 Oe, which is caused by particle stacking' During the active adsorption process on preparation of magnetic paint, where MEK (methyl ethyl ketone), TOL (toluene) and CHO (cyclohexanone) were used, chemisorption of solvents on the surface of substituted BaFe particle occurred to form polymeric compounds surrounding the particle. An increase in coercivity, caused by the solvent adsorption, was significant for Co-substutited BaM tape. Among these solvents CHO was the most effective one in increasing the coercivity of the Co-Ti substituted BaM tape.

• Fire Science and Engineering
• /
• v.27 no.1
• /
• pp.39-45
• /
• 2013

This study analyzes the explosion hazard of dry cleaning solvent recovery machine in laundry shop in two aspects, i.e. combustible and ignition source, and determines the explosive conditions of this machine by conducting mockup explosion tests repeatedly, varying conditions and using real dry cleaning solvent recovery machines. As to combustibles, two kinds of combustibles used widely in Korea have been selected and tested. The flash points, LEL's, and saturation vapor pressures of those combustibles have been measured, and their explosion specific curves have been drawn, based on the results of the measurements, so that the explosion risks of those materials may be determined, depending on the temperatures. Potential voltages generated from materials for laundry and foreign materials of metals have been assumed to be the ignition sources in this application, and their potential voltages have been measured, depending on temperature, humidity, and antistatic agent, by using real materials for laundry and a potential voltage measuring device. Tests have been conducted, varying the quantities, concentrations, and operating temperatures of materials for laundry. As a result, explosions have not been generated with potential voltages of materials for laundry, but explosions have been observed when applying artificial spark energy of 2.0 mJ.

• Journal of the Korea Institute of Building Construction
• /
• v.17 no.5
• /
• pp.437-444
• /
• 2017

In the composite waterproofing method in which a polyurethane coating waterproofing material is applied on the modified asphalt waterproofing sheet, the organic solvent is diluted in the coating waterproofing material in order to improve the workability. However, since the organic solvent is not volatilized before the curing of the polyurethane coating waterproofing material, the organic solvent causes dissolution of asphalt layer, thereby causing oil leakage. As a result, a polyamide film having a high dissolution resistance property was laminated on modified asphalt sheet, and through testing the dissolution resistance was visually confirmed and quantitative analysis of the polyamide film by SEM-EDX analysis was also used to confirmed the dissolution resistance of the polyamide film.