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Volume 15 (2002)
- Issue 6 Pages 389-
- Issue 5 Pages 331-
- Issue 4 Pages 241-
- Issue 3 Pages 151-
- Issue 2 Pages 95-
- Issue 1 Pages 9-
Volume 15, Issue 2
Displaying 1-5 of 5 articles from this issue
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W. Chrishanthl FERNANDO, Kousuke SUYAMA, Kazuhlto ITOH, Hldeyukl TANAK ...2002 Volume 15 Issue 2 Pages 95-102
Published: March 29, 2002
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSCornstarch is a preferable raw material in the production of biodegradable plastics. Five composites of a modified (by acylation) cornstarch plastic were tested for the biodegradability in four soils collected from sites namely, Ama, Taketoyo, Shinshiro, and Hekinan of Aichi prefecture in Japan. The plastics slightly differedfrom each other in chemical composition. The degradation was evaluated quantifying the weight loss by combustion after burying the sheets (3cm×3cm) of plastic in soil, and retrieving periodically over 18-48 weeks. The plastic L, which composed of 83 paper, exhibited an average degradation of 79% by 18 weeks. The thin laminated resin film of it was brittle with loss of strength. The plastics S and MS with short acyl groups degraded 45% and 40% respectively. The plastics PF and 2V with both short and long acyl groups degraded only 6% and 1 .2% respectively. This resistance to degradation was supposed to be due to the presence of long acyl groups in the polymer. Prolonged incubation up to 48 weeks, exhibited great deterioration. The degradation did not significantly depend on the physico-chemical characteristics of soil.View full abstractDownload PDF (2084K) -
Naohlro MASUDA, Sachihiko HARASHINA2002 Volume 15 Issue 2 Pages 103-111
Published: March 29, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA form of meetings called "experts committee" has been utilized to support plan of public works projects proposed by an administrative body . The meetings are closed generally, and the deliberation process is not shown to the public. In the Yoshino River hydro dam project, the general public was allowed to make access to the deliberation process step-by-step in the total process . In addition to be observers in the meeting room, the citizens could watch the meetings through a television monitor set in another room . The mass media demanded an exhibition of the meetings powerfully and took up a problem positively . This attracted the concerns of many citizens in the disputable process. The citizens group getting data from the Ministry of construction asked an expert to calculate water level independently . The result was different from that of the proponent and it influenced the discussion . This case should be a fine example to show the effects of information disclosure of experts committee.View full abstractDownload PDF (1539K) -
Izumi WATANABE, Akiko MAEHATA, Hlrokazu OZAKI, Katsuji KUNO2002 Volume 15 Issue 2 Pages 113-125
Published: March 29, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSOze, located in Nikko National Park, is a one of the most famous places in Japan. Traffic problems derived from over-use in this region have become a great concern. This study was aimed to evaluate these effects by using a heavy metal analysis. Vanadium, Cr, Ni, Cu, Zn, Cd, Pt, Pb and pH were determined in street dusts, forest soil, asphalt and road sign paint collected around Oze in 1999. Increasing trends of heavy metal concentrations except in Pt from mountainous (HATOMACHI: major entrance place) to urban areas (NUMATA) were observed as similar geographical trends of traffic density obtained at the same area. Lead, Zn and Cd concentrations at TSUNAKI, where is a junction of three roads, were comparable to those at NUMATA. Elevated concentrations of heavy metals were found in September and July when many visitors came. Correlations between Pb, Zn, Cd, Cr, Ni, Cu and V concentrations were significant. These relationships suggest that the source of these elements might be the same. Local variations and seasonal changes of heavy metals observed in our results might be dependent on traffic density and suggest an existence of pollution due to over-use of motor vehicles even in 1999 when traffic control was strict in this region.View full abstractDownload PDF (1629K) -
Kazuakl TAKEDA, Kazuklyo YAMAMOTO, Chisato TAKENAKA, Hlroaki MINOURA, ...2002 Volume 15 Issue 2 Pages 127-136
Published: March 29, 2002
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe causes of tree death observed in 1994 and 1995 in Mikawa region, Aichi prefecture were analyzed by using GIS (Geographical Information System) extensively. The factors of topography, altitude, soil type, tree species, geology, precipitation, and oxidant concentration were used for the analysis. The analytical results showed that there was no relationship between geology, soil types or precipitation, and tree death. We found that most of the damaged areas were located at 200'400 m altitude along the major rivers. These locations are considered to be easily affected by polluted air invaded through valleys of the major rivers from the upper air above Ise Bay and Mikawa Bay, where high concentration of oxidant was observed. These results suggest that a chronic stress by polluted air such as oxidant might cause tree decline in Mikawa region.View full abstractDownload PDF (10494K) -
Seiki TANADA, Akio NAKANISHI, Motoharu TAMAI, Naohito KAWASAKI, Takeo ...2002 Volume 15 Issue 2 Pages 137-141
Published: March 29, 2002
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSRecently, the recycling of organic by-products and waste has become very important. The technology for recycling organic by-products must allow for sustainable development and contribute to the quality of human life . In this study, techniques for producing carbonaceous adsorbents from an organic by-product and the application of these materials to humidity control in a house are described. Coffee grounds and oolong tea leaves as organic by-products were carbonized at 673 to 1073K. The iodine adsorption capacity of the carbonaceous materials increased with an increase in the carbonization temperature. Comparatively, the amount of water adsorbed on the carbonization materials produced from oolong tea leaves at 873K for 2h was the highest. The humidity control by the carbonization materials produced from organic wastes was higher than that by the activated carbon . These results indicated that the carbonaceous materials produced from oolong tea leaves at 873K for 2h could be useful for humidity control in the environment of a house.View full abstractDownload PDF (577K)
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