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EFFECTS OF OZONATION AND CHLORINATION ON VIABILITY AND INFECTIVITY OF CRYPTOSPORIDIUM PARVUM OOCYSTS
Hirata, T.,Chikuma, D.,Shimura, A.,Hashimoto, A.,Motoyama, N.,Takahashi, K.,Moniwa,T.,Kaneko, M.,Saito, S.,Maede, S. 嶺南大學校 環境問題硏究所 1999 環境硏究 Vol.19 No.1
ABSTRACT Experimental studies on ozonation and chlorination were conducted to determine capacity for inactivating Cryptosporidium parvum oocysts in batch modes at pH 7, 20℃. In both experiments, the log reduction of animal infectivity was linear and clearly decreased as disinfectant CT product increased. However, the curve of reduction in viability determined by both in vitro excystation assay and DAPI/PI permeability assay exhibited a shoulder. The CT products of ozone per 1 log reduction in infectivity were 3 mg·min/L for 0.5 mg/L and 1.5mg·min/L for 0.3 mg/L, while viability determined by in vitro excystation was reduced by only 0.2 logs for the CT product of 3 mg·min/L. In the chlorination experiment, the reduction of animal infectiviry was up to 3 logs for the CT product of 2,700 mg·min/L, while reduction of viability was smaller at 0.16 logs in in vitro excystation and 0.04 logs in DAPI/PI permeability (in PI exclusion)for the same CT product. The CT product of free chlorine per 1 log reduction in infectivity was estimated to be in the range of 800 to 900 mg·min/L Experimental studies on ozonation and chlorination were conducted to determine capacity for inactivating Cryptosporidium parvum oocysts in batch modes at pH 7, 20℃. In both experiments, the log reduction of animal infectivity was linear and clearly decreased as disinfectant CT product increased. However, the curve of reduction in viability determined by both in vitro excystation assay and DAPI/PI permeability assay exhibited a shoulder. The CT products of ozone per 1 log reduction in infectivity were 3 mg·min/L for 0.5 mg/L and 1.5 mg·min/L for 0.3 mg/L, while viability determined by in vitro excystation was reduced by only 0.2 logs far the CT product of 3 mg·min/L. In the chlorination experiment, the reduction of animal infectivity was up to 3 logs for the CT product of 2,700 mg·min/L, while reduction of viability was smaller at 0.16 logs in in vitro excystation and 0.04 logs in DAPI/PI permeability (in PI exclusion) far the same CT product. The CT product of free chlorine per 1 log reduction in infectivity was estimated to be in the range of 800 to 900 mg·min/L.
STUDY ON MECHANICAL CHARACTERISTIC OF INCINERATION RESIDUE OF MSW FOR ITS EFFECTIVE UTILIZATION
( T. Hirata ),( Y. Maeno ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1
In Japan, the amount of the waste dumped in final disposal sites is increasing rapidly and developing a new final disposal site is very hard nowadays. Therefore, the lifespan of the final disposal sites appropriate for waste is decreasing progressively. Then, one of the important issues is how to decrease the amount of waste to be dumped in the final disposal site. For the purpose of decreasing the amount of waste, the authors have been considering the possibility of effective utilization of waste. Particularly, about 80 % of municipal solid waste (MSW) is burned at the incineration plants, then a large amount of incineration residue is produced in Japan. So, how to reduce the volume of incineration residue to be dumped in the final disposal site is an important issue, too. Therefore, the authors have studied the incineration residue in order to develop its new utilization. For it, it is necessary to clarify not only the chemical but also mechanical properties of incineration residue. The authors tried to carry out some geo-mechanical tests. In this paper, the authors mainly report these test results.
( T. Hirata ),( Y. Maeno ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2
일본에서 매립지에 버려지는 대량의 폐기물은 급속히 증가하며 현재 새로운 최종처분은 전무하다. 그러므로 폐기물의 적당한 매립지의 수명은 점점더 감소하고 있고 매립지에 버려지는 대량의 폐기물을 감소할수 있는 방법이 중요한 이슈중 하나이다. 대량의 폐기물 감소의 목적으로 폐기물의 효과적 이용 가능성에 대해 토의한다. 특히, 도시 고형 폐기물(MSW)의 약80%는 소각장에서 소각하고 대량의 소각재가 발생한다. 그래서, 매립지에 버려지는 소각재의 부피를 감소하는 방법또한 중요한 이슈이다. 그러므로 소각재를 새롭게 이용하는 연구를 하며, 화학적이 아니라 소각재의 역학특성을 밝히는 것이 필요하다. 몇몇의 토양역학 실험을 실행하였고, 이 논문에서는 주로 이러한 실험결과에 대해 논한다. In Japan, the amount of the waste dumped in final disposal sites is increasing rapidly and developing a new final disposal site is very hard nowadays. Therefore, the lifespan of the final disposal sites appropriate for waste is decreasing progressively. Then, one of the important issues is how to decrease the amount of waste to be dumped in the final disposal site. For the purpose of decreasing the amount of waste, the authors have been considering the possibility of effective utilization of waste. Particularly, about 80 % of municipal solid waste (MSW) is burned at the incineration plants, then a large amount of incineration residue is produced in Japan. So, how to reduce the volume of incineration residue to be dumped in the final disposal site is an important issue, too. Therefore, the authors have studied the incineration residue in order to develop its new utilization. For it, it is necessary to clarify not only the chemical but also mechanical properties of incineration residue. The authors tried to carry out some geo-mechanical tests. In this paper, the authors mainly report these test results.
Search for the H Dibaryon in (K-, K+) Reactions
Bahk,S. Y.,Chung,K. S,Chung,S. H.,Funahashi,H.,Hahn,C. H.,Hara,T.,Hirata,S.,Hoshino,K.,Ieiri,M.,Iijima,T.,Imai,K.,Ishigami,T.,Itow,Y.,Kazuno,M.,Kikuchi,K.,Kim,C. O.,Kim,D. C.,Kim,J. Y.,Kobayashi,M.,Ko 國立昌原大學校 基礎科學硏究所 1992 基礎科學硏究所論文集 Vol.3 No.-
We have studied(??) reactions from an emulsion target. The S--2H dibaryon has been searched for by the analysis of the ??? momentum spectrum together with emulsion data. No evidence of H production was observed in the mass range of 1.90-2.16 GeV/c². Upper limits for the production cross section of the H are (0.2-0.6)% of that for the quasifree ??? production at the 90% confidence level.
Direct Observation of Sequential Weak Decay of a Double Hypernucleus
AOKI, S.,BAHK, S. Y.,CHUNG, K. S.,CHUNG, S. H.,FUNAHASHI, H.,HAHN, C. H.,HARA, T.,HIRATA, S.,HOSHINO, K.,IEIRI, M.,IIJIMA, T.,IMAI, K.,ISHIGAMI, T.,ITOW, Y.,KAZUNO, M.,KIKUCHI, K.,KIM, C. O.,KIM, D. C 國立昌原大學校 基礎科學硏究所 1992 基礎科學硏究所論文集 Vol.3 No.-
We have studied stars in nuclear emulsion due to the capture at rest of the ??? hyperons produced in the(???) reaction. The sequential weak decay of a double hypernucleus(nucleus with S= -2) has been directly observed. The double hypernucleus is assigned as either ???? or ????. This assignment excludes the existence of the H dibaryon lighter than 2203.7±0.7 MeV/c².
Evidence of Weak Decay of Heavy Double Hypernuclei
Aoki, S.,Bahk, S. Y.,Chung, K. S.,Chung, S. H.,Funahashi, H.,Hahn, C. H.,Hara, T.,Hirata, S.,Hoshino, K.,Ieiri, M.,Iijima, T.,Imai, K.,Ishigami, T.,Itow, Y.,Kazuno, M.,Kikuchi, K.,Kim, C. O.,Kim, D. C 國立昌原大學校 基礎科學硏究所 1992 基礎科學硏究所論文集 Vol.3 No.-
We have studied 80 events of candidates for ??? capture star at rest in nuclear emulsion, where ??? hyperons are produced in (??????) reactions identified by a ?? spectrometer. The weak decay of heavy double hypernuclei is confirmed, studying the distribution of visible energy-release and the probability of emission of two fast protons, in comparison with those for single hypernuclei.
Hirata, M.,Iwamoto, T.,Otozu, W.,Kiyota, D. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.5
The effects of recording interval (1, 2, 3, 4, 5, 10, 15, 20 and 30 min) on the estimation of some grazing behavior variables in beef cows and calves (<4 months old) were investigated in a daytime grazing (7 h) system utilizing a bahiagrass (Paspalum notatum Flugge) pasture (a 1.1 ha paddock and a 0.4 ha resting area). Recording intervals of 10-30 min tended to underestimate the time spent grazing and ruminating and overestimate the time spent resting by animals, whereas intervals of 1-5 min resulted in almost constant estimates. In all grazing activities, the errors of estimation became larger when the recording interval exceeded 5 min. The accuracy of estimation was higher for grazing time>rumination time>resting time. An increase in recording interval always decreased estimates of the distance walked by animals. It was concluded that recording intervals of 1-5 min provide reliable estimates of the time spent grazing, ruminating and resting. It was also concluded that positioning of animals at 1 min intervals may provide estimates of walking distance with acceptable bias toward underestimation.