http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Energy Measures to Keep the Clean Earth
Mikio Kasahara 한국대기환경학회 2009 한국대기환경학회 학술대회논문집 Vol.2009 No.5월
Uranium type atomic bomb has been devoted firstly in Hiroshima on August 6, 1945(Fig. 16). And after three days from that day, plutonium type r atomic bomb has been devoted in Nagasaki. More than 130,000 and 75,000 citizens were killed in Hiroshima and Nagasaki, respectively. And obviously, the environment has been destroyed completely by the atomic bombing. Furthermore, after tow-atomic bombings, total 2,051 atomic bomb tests have been conducted mainly in the Pacific Ocean area. A lot of local people have been screwed with the radiation from atomic bomb test as shown in Fig. 15. Atomic bomb and war undoubtedly destroys worst the environment as well as killing the people. We should bring every war to an end in order to respect all human right, to eliminate the waste energy, and to keep the clean earth.
An Experimental Estimation of Two Detection Limit Models
Chang-Jin Ma(Chang-Jin Ma),Susumu Tohno(Susumu Tohno),Mikio Kasahara(Mikio Kasahara),Gong-Unn Kang(Gong-Unn Kang) 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.E1
In environmental studies, decisions are often made on the analytical data indicating certain contaminants as being "detected" or "non-detectible." Since detection limits are analytical method specific, one has to first review the concepts and definitions associated with analytical method systems and specifications. In this study, the experimental analytical values for a series of low level standards (for an ionic species) were used as an example to estimate two different method detection limits (MDL). The scores of EPA's MOL and Pallesen's MDL determined by real analytical scores are 0.0575 and 0.0561 mg/L, respectively for our nitrate data. These scores determined by two different MDL models are roughly similar, while there are apparent differences between two methods with respect to statistical and systematical procedure. However, detennination of MDL for one's laboratory provides some practical applications which helps to assure one's regulating authorities that one's measured scores are accurate.
Characteristics of Gas- and Particle-phase Acids and NH₃at Urban and Rural Sites in Korea
Chang-Jin Ma(Chang-Jin Ma),Hui-Kang Kim(Hui-Kang Kim),Gong-Unn Kang(Gong-Unn Kang),Susumu Tohno(Susumu Tohno),Mikio Kasahara(Mikio Kasahara) 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.E1
To study the characteristics of ammonia and the related compounds, atmospheric aerosols and gases were collected using a triple filter pack sampler, a low volume air sampler, and a three-stage Andersen air sampler in Seoul and Kangwha Island, Korea from Dec. 1996 to Oct. 1997. Ammonia concentrations showed approximately two times higher in summer than in winter at both sites. The highest HNO₃ levels were generally observed in summertime at two sampling sites. The average mass concentration of PM_2.5 in heavily industrialized Seoul was about three times higher than that of Kangwha. In winter, the sum of NH₄^+ and its counter ions (such as CI^-, NO₃^-, and S0₄²^-) comprised 30-41% of PM_2.5 mass concentration at each sampling site. Temperature dependence of particulate nitrate was examined at the urban sampling site. The formation of the nitrate in the fine mode was dependent not only on the amount of precursors but also on the variation of temperature. (NH₄)S0₄and NH₄HS0₄coexisted with NH₄NO₃and NH₄Cl at each site. According to the summertime backward trajectory analysis. NO₃- showed higher level with air parcels transported from northeast Asian continent. On the other hand, the concentration of SO₄²- showed significantly higher level when air masses originated from Pacific Ocean, southern part of Japan. and Korea.
Development of Defogger Equipped with a Roller Horsehair Brush
마창진,Mikio Kasahara,Renqiu Cao 한국대기환경학회 2016 Asian Journal of Atmospheric Environment (AJAE) Vol.10 No.4
In order to remove fog often causes various troubles in our daily lives, the novel defog blower equipped the roller brush made of recycled horse’s mane hair was developed. This work presents the overview of new defog devices and the experimental data obtained at two different kinds of defogging experiments. In the model experiment carried out at the enclosed cleanroom (W 5.9 m×L 5.1 m×H 2.4 m) targeted a vinyl house, fog was dissipated in less than 30 seconds in case with wind entrainment and two minutes 45 seconds in case without wind entrainment after running of the newly designed defog blower. When the demisting blower was run in a duct, it has an excellent mist sweeping qualities as well as a great removal effect for the background particles (89.5% and 65.4% scavenging rates for fine and coarse particles, respectively). It can be therefore said that the mist eliminator presented in this paper is ideal for use in the sealing space like a vinyl house and the industrial sites where required to remove both harmful mist and particle.
Characteristics and Temporal Distribution of Airborne Pollen in an Urban Area of Japan
마창진,강공언,Mikio Kasahara,Susumu Tohno 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.e3
Using a sampling device of our own making, airborne pollen has been monitored in Kyoto, Japan fromthe middle of February to the end of May 2004. From the morphological analysis of pollen grains byPine, Alder, Cyclobalanopsis, Chamaecyparis, and Equisetum. Daily average airborne pollen counts showstrong variations from the day to day which makes the appropriate daily forecasts that could be ofpractical use for patients difcult. Diurnal variation of airborne pollen grains at our local sampling site isvery irregular and shows no similarity between pollen types. The highest concentrations of Cryptomeriaand Alder pollens in the south-while the increase in Pine pollen grain in the southern wind direction was probably due to the local spread.Prevailing wind direction (SW) during the pollinating periods of Cryptomeria and Alder pollens couldsuggest a long-distance transport from a distant mountain.
마창진,Susumu Tohno,Mikio Kasahara 한국대기환경학회 2011 Asian Journal of Atmospheric Environment (AJAE) Vol.5 No.1
Quantifying the solute composition of a cloud droplet (or a whole droplet) is an important task for understanding formation processes and heating/cooling rates. In this study, a combination of droplet fixation and SR-XRF microprobe analysis was used to visualize and quantify elements in a micro-scale droplet. In this study, we report the preliminary outcome of this experiment. A spherical micro-scale droplet was successfully solidified through exposure to α-cyanoacrylate vapor without affecting its size or shape. An X-ray microprobe system equipped at the beam line 37XU of Super Photon ring 8 GeV (SPring-8)was applied to visualize and quantify the elemental composition in an individual micro-scale droplet. It was possible to reconstruct 2D elemental maps for the K and Cl contained in a microdroplet that was dispensed from the 10-ppm KCl standard solution. Multi-elemental peaks corresponding to X-ray energy were also successfully resolved. Further experiments to determine quantitative measures of elemental mass in individual droplets and high-resolution Xray microtomography (i.e., 3D elemental distribution)are planned for the future.