• Elastomers and Composites
• /
• v.56 no.1
• /
• pp.1-5
• /
• 2021

Tire and road wear particles (TRWPs) were collected from road dust and thermogravimetric analysis (TGA) was performed to measure the content of tire wear particles (TWPs) in the TRWPs. The TGA thermograms of TRWPs showed two weight loss steps associated with polymer decomposition including weight loss after 480℃ which may be due to road wear particles. Different samples gave different TGA thermograms because the types and contents of the road wear particles attached to the TWPs should be different from each other, and each TWP might have different composition. The TGA results of the model asphalt pavement wear particles, with (volatile organics + polymers + carbon black) : ash = 33.5 : 66.5, was applied to the TRWP results, and the TWP contents of TRWPs were found to be 50-65%. The zinc oxide content in the rubber compound was negligible.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2005.11a
• /
• pp.136-137
• /
• 2005

• The Bulletin of The Korean Astronomical Society
• /
• v.25 no.2
• /
• pp.50-50
• /
• 2000

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2006.04a
• /
• pp.75-76
• /
• 2006

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2006.04a
• /
• pp.217-219
• /
• 2006

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2006.10a
• /
• pp.43-46
• /
• 2006

• The Bulletin of The Korean Astronomical Society
• /
• v.30 no.1
• /
• pp.35.2-35.2
• /
• 2005

• The Bulletin of The Korean Astronomical Society
• /
• v.11
• /
• pp.5.2-5.2
• /
• 1986

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.28 no.1
• /
• pp.66-71
• /
• 2004

Airborne contaminant particles are intruded into optical disk drive(ODD) due to the flow caused by disk rotation and can be adhered to objective lens, which causes read/write errors. Such a phenomenon can be a serious problem for high-density storage devices. The purpose of this paper is to understand the effect of particle contamination of objective lens in a CD-ROM drive on laser diode power and photo diode RF signal. The measurements of laser power and readout RF signal were carried out by using a laser power meter and a time interval analyzer, respectively. The parameters for estimating a readout-signal' distortion were its jitter and amplitude. Alumina(Al$_2$O$_3$) particles were used as test dust particles. The results show that the failure for data access happened as the degree of lens contamination was greater than 20％.

• Proceedings of the Korean Environmental Health Society Conference
• /
• 2001.11a
• /
• pp.1.1-5
• /
• 2001

High SPM concentrations(199.8~249.4${\mu}{\textrm}{m}$/㎥) were detected in the west Korea during the Yellow Sand Periods, 2000. Majority of the total SPM were composed of about 5${\mu}{\textrm}{m}$ sized coarse particles over the periods. However, fine particles sized about 1 ${\mu}{\textrm}{m}$ and coarse particles sized about 5-6${\mu}{\textrm}{m}$ showed peaks at the graph of SPM size distribution in the Non Yellow Sand Period. Airborne fungal spores at the SPM samples were cultured and identified. Full-grown colonies during the Yellow Sand Periods, Fusarium, Aspergillus, Penicillium and Basipetospora are hyphomycetes in the division Fungi imperfecti(Deuteromycota). And morphologically more diversified mycelia of hyphomycetes were grown on the sample captured from 1.1~2.1${\mu}{\textrm}{m}$ sized SPM than on other sized samples during the Yellow Sand Period. But no mold was observed on the sample of 1.1~2.1${\mu}{\textrm}{m}$ sized SPM in the Non Yellow Sand Period. It was thought that several sorts of fine sized fungal spores were suspended in the atmospheric environment of the west Korea during the Asian dust episodes.