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排序方式: 共有211条查询结果,搜索用时 15 毫秒
191.
192.
Tatsuo Suzuki 《Chemistry and Ecology》1995,10(3):249-258
A new material with high content of fly ash named 'Ashcrete' has been developed. to examine the applicability of Ashcrete to marine structures, strength characteristics, resistance to sea water attack, and safety in the marine environment have been studied. the following results have been obtained:
1) the strength characteristics of high-volume fly ash concrete depend upon the type and proportions of chemical activators as well as curing conditions.
2) Ashcrete using sodium chloride (NaCI) as a chemical activator shows high initial strength and good strength development with age.
3) Ashcrete containing NaCI activator shows good resistance to sea water from the viewpoint of its strength characteristics, volume changes and microstructurcs.
4) Since 1980 many types of large-scale artificial reefs made of Ashcrete have been installed in the sea. As a result of long-term studies and underwater observations, the Japanese Government has demonstrated the durability of the material, safety in the marine environment and attractiveness to fish.
5) It is therefore proposed that Ashcrete might be used in constructing large-scale sea mounts in deep water for the purpose of generating upwelling. 相似文献
1) the strength characteristics of high-volume fly ash concrete depend upon the type and proportions of chemical activators as well as curing conditions.
2) Ashcrete using sodium chloride (NaCI) as a chemical activator shows high initial strength and good strength development with age.
3) Ashcrete containing NaCI activator shows good resistance to sea water from the viewpoint of its strength characteristics, volume changes and microstructurcs.
4) Since 1980 many types of large-scale artificial reefs made of Ashcrete have been installed in the sea. As a result of long-term studies and underwater observations, the Japanese Government has demonstrated the durability of the material, safety in the marine environment and attractiveness to fish.
5) It is therefore proposed that Ashcrete might be used in constructing large-scale sea mounts in deep water for the purpose of generating upwelling. 相似文献
193.
Ryutaro Ohtsuka Tetsuro Hongo Toshio Kawabe Tsuguyoshi Suzuki Tsukasa Inaoka Tomoya Akimichi Hideo Sasano 《Environment international》1985,11(6):505-508
This study presents concentration of nine minerals (Na, K, Mg, Ca, Cl, Mn, Zn, Cd, Pb) in 31 drinking water samples collected in the Papua New Guinea lowland, where coastal villagers draw water from artificial wells blended with sea water, riverside villagers utilize brackish river water, and inland villagers fetch creek or swamp water whose chemical composition is close to rain water. During the dry season, the coastal well water contains 500 mgL−1 of sodium and 50–90 μgL−1 of lead. The inland creek or swamp water contains very small amount of minerals; on the average, for instance, 0.64 mgL−1 of magnesium, 0.84 mgL−1 of calcium, and 4.78 mgL−1 of water hardness (as CaCO3). From some epidemiological evidence in industrialized countries, these mineral concentrations are judged to be indicative of high risk of cardiovascular disorders. 相似文献
194.
Biphenyl was found to be converted to mutagenic compounds by UV irradiation with a high-pressure mercury lamp in nitrate aqueous solution under neutral conditions. The mutagenicity of the reaction mixture increased in proportion to the nitrate ion concentration. The most mutagenic product was dinitro dihydroxy biphenyl, and the main products in this reaction were 2-hydroxy-3-nitrobiphenyl and 4-hydroxy-3-nitrobiphenyl. 相似文献
195.
Miyabara Y Sakata Y Suzuki J Suzuki S 《Environmental pollution (Barking, Essex : 1987)》1994,84(2):117-122
An attempt was made to establish a new indicator for faecal pollution in aquatic environments using a sensitive determination method for urobilins, which are only present in mammalian faeces and urine. Assessment of urobilin stability was followed by determination of the amount of urobilins in river water. When river water containing urobilins was shaken at room temperature, the number of total and faecal coliforms increased, while urobilins decreased only in small amounts, indicating that urobilin is relatively stable in river water and hence can serve as a useful indicator for the estimation of faecal pollution of river water. The amount of urobilins in the river waters increased steeply from the mid-point of a stream near a sewage treatment plant, while amounts in the upper stream were very low. The amount of urobilins in river water increased after rainfall. Findings suggested that urobilin, i.e. sewage, originated from the output of the sewage treatment plant and raw sewage. 相似文献
196.
Effluents from a night-soil treatment plant, where night-soil was aerobically treated by an activated sludge process, were irradiated with a UV lamp excluding short wavelengths less than 300 nm as a model of exposure to sunlight and the mutagenicities of the ethylacetate extracts from the irradiated effluents were assayed using Salmonella typhimurium TA98. The extracts exhibited mutagenicity toward S. typhimurium TA98 in the absence of rat liver S9 fraction only when the effluents were fortified with nitrite ion (more than 6 ppm) by over aeration or by artificial addition of nitrite, indicating that a limiting factor for mutagen formation is nitrite ion concentration. Nine organic-N-containing compounds as models of the organic components in the effluent were also irradiated and direct-acting potent mutagens were found to be produced from such compounds having indole moiety as indole, oxindole, tryptophan and tryptamine. 相似文献
197.
Inoue M Suzuki A Nohara M Kan H Edward A Kawahata H 《Environmental pollution (Barking, Essex : 1987)》2004,129(3):399-407
We present 40 year-long skeletal chronologies of tin (Sn) and copper (Cu) from an annually-banded coral (Porites sp.) collected from Pohnpei Island, Micronesia (western equatorial Pacific). Both the elements are present in antifouling marine paints and are released inadvertently into ambient seawater. Especially, Sn has often been used in the form of tributyltin (TBT). Based on a stepwise pretreatment examination, Sn and Cu both inside and outside the aragonite lattice of the coral skeleton show a potential for providing marine pollution indicators. High values of extra-skeletal Cu/Ca and Sn/Ca atomic ratios were found between late 1960s and late 1980s during a period of active use of TBT-based antifouling paints worldwide. However, a significant decrease in both the ratios in the beginning of 1990s can be attributed to regulation of the use of TBT on cargo ships by countries such as the USA, Japan and Australia. 相似文献
198.
本文系作者对中国环境问题十几年研究成果的总结。作者重点阐述了全球环境问题、地球变暖与中国的现状、酸雨与中国的现状、臭氧层破坏与中国现状、野生生物种的灭绝与中国现状等。 相似文献
199.
200.
Lina GAN Shan LEI Jian YU Hongtao MA Yo YAMAMOTO Yoshizo SUZUKI Guangwen XU Zhanguo ZHANG 《Frontiers of Environmental Science & Engineering》2015,9(6):979-987
Monolith SCR catalysts coated with V2O5-WO3/TiO2 were prepared by varying binder and coating thickness. Comparing with a monolith extruded with 100% V2O5-WO3/TiO2 powder, a coated monolith with a catalyst-coating layer of 260 μm in thickness exhibited the similar initial NOx reduction activity at 250°C. After 4 h abrasion (attrition) in an air stream containing 300 g·m−3 fine sands (50–100 μm) at a superficial gas velocity of 10 m·s−1, the catalyst still has the activity as a 100% molded monolith does in a 24-h activity test and it retains about 92% of its initial activity at 250°C. Estimation of the equivalent durable hours at a fly ash concentration of 1.0 g·m−3 in flue gas and a gas velocity of 5 m·s−1 demonstrated that this coated monolith catalyst is capable of resisting abrasion for 13 months without losing more than 8% of its initial activity. The result suggests the great potential of the coated monolith for application to de-NOx of flue gases with low fly ash concentrations from, such as glass and ceramics manufacturing processes. 相似文献