간행물
한국환경과학회지 KCI 등재 Journal of Environmental Science International
- 발행기관 한국환경과학회
- 자료유형 학술지
- 간기 월간
- ISSN 1225-4517 (Print)2287-3503 (Online)
- 수록기간 1992 ~ 2023
- 주제분류 자연과학 > 자연과학일반 자연과학 분류의 다른 간행물
- 십진분류KDC 539DDC 628
권호리스트/논문검색
제16권 제9호 (2007년 9월) 12건
1.
2007.09
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This study was conducted to analysis the ecological characteristics of "Wando Holly"(Ilex × wandoensis) which is expecting as a possible ornamental tree with its beautiful leaves, flowers and fruits, and to find special breeding material which have particular characteristics and also provide correct environmental information which are required for commercial cultivation. The hill of Galmoon-Ri, Gunoei-Myon, Jeonnam Province, Korea, were reported as a original habitat of native Ilex × wandoensis. The investigation shows that soil pH of native habitat was 6.18, hardness was 2.39, humidity was 38.6%, direction of slope is SSW, and average inclination was 15°. The vegetation around I. × wandoensis is occupied by trees like an Quercus variabilis, Q. serrata, Q. acuta and so on. These are mixed forest of deciduous trees. Tree height reached up to about 12m and its coverage is about 30%. Q. salicina, Camellia japonica, I. integra, Cryptomeria japonica account for sub-tree layer. Tree height is around 8m and coverage is about 20%. Shrub layer was taken by Viburnum furcatum, Callicarpa japonica, Styrax japonica, Eurya japonica, Lindera obtusiloba, Ligustrum japonicum, Smilax china, Cornus walteri etc. Tree height reaches around 1.2m and coverage is around 20%. Herb layer includes Trachelospermum asiaticum var. intermedium, Cymbidium goeringii, Dryopteris bissetiana, Disporum viridescens, Disporum smilacinum, Sasa borealis var. gracilis etc. Trachelospermum asiaticum var. intermedium, which are observed in southern evergreen zone, are dominant and its coverage is around 20%. The native habitat was in spoiled condition because of artificial thin out.
2.
2007.09
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This study was performed in 30 selected apartments in Seoul, Asan and Daegu area which were constructed within 4 years and over 4 years, to measure the concentration of VOCs(benzene, toluene, xylene) from July, 2004 to September. Mean ratios of indoor to outdoor VOCs concentrations in the construction under 4 years were higher in 1 than average, I/O ratio of over 4 years were lower in 1. This was considered that the VOCs density influences indoor pollutant. For the indoor air quality estimation, the deposition constant and the source strength factor of toluene were 1.49±2.05 hr-1 and 36.95±52.26 ppb/h, respectively.
3.
2007.09
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The purpose of this study was to investigate the flora of Mt. Bongrae in Busan from February 2004 to May 2005. The flora in the surveyed area were identified 291 taxa that belonged to 82 families, 201 genera, 251 species, 35 varieties, and 5 forms. Among them, evergreen broad trees were identified 21 taxa, naturalized plants 30 taxa, especial plants decided by Ministry of Environment 24 taxa. By the vegetation of each slope, in northeast slope, it was dominanted such as Pinus thunbergii community, Chamaecyparis obtusa community, Amorhpa fruticosa community, Trachelospermum asiaticum var. intermedium-Hedera rhombea community, north-northeast slope, it was distributed both Pinus thunbergii community and board-leaved tree community. In the southwest slope of coast site, it was presented plantation plants, according to altitude distributed such as natural vegetation, evergreen broad trees, warm-temperate plants. In southeast slope, it was to represent secondary vegetation such as Alnus firma community as a forest fire. Underside was mainly to search herbs such as naturalized plants and cruciferous family as a vegetable garden. In northwest slope, it was searched trees such as Pinus thunbergii community, Lindera obtusiloba, Styrax japonca, Prunus sargentii, Aralia elata, Zanthoxylum piperitum, Akebia quinata and herb layer such as Osmunda japonica, Allium thunbergii, Liriope platyphylla, Corydalis ochotensis, Scilla scilloides, Viola orientalis. Around the top, it was distributed such as Rhododendron mucronulatum-Rhododendron schlippenbachii community, Carpinus coreana, Viburnum erosum, Sorbus alnifolia.
4.
2007.09
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This study analyzed two dimensions hydraulic characteristic for actual flood events in steep meandering channel. It could get analysis results as follows;
A water level difference of downstream more great than one of upstream at inner and outer of meandering channel. It judged that a significance of downstream level could appear more greatly in meandering channel bank, hydraulic structure and flood inundation analysis. As velocity and depth analysis was shown that much amount flow passing fast velocity happened in meandering channel, it could help establishment of meandering channel bank. In this study, the results of two dimension hydraulic analysis results could help a counterpaln establishment for the flood inundation and bank collapse.
5.
2007.09
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A Case Study on Typhoon-Midlatitude Synoptic System Interaction: Typhoons Rusa(0215) and Maemi(0314)
The impact of midlatitude synoptic system (upper-level trough) on typhoon intensity change was investigated by analyzing the spatial and temporal characteristics of vertical wind shear (VWS), relative eddy momentum flux convergence (REFC), and potential vorticity (PV). These variables were computed over the radial mean 300~1,000 km from the typhoon center by using GDAPS (Global Data Assimilation and Prediction System) data provided by the Korea Meteorological Administration (KMA). The selected cases in this study are typhoons Rusa (0215) and Maemi (0314), causing much damage in life and property in Korea.
Results show that the threshold value of VWS indicating typhoon intensity change (typhoon to severe tropical storm) is approximately 15 m/s and of REFC ranges 6 to 6.5 ms-1day-1 in both cases, respectively. During the period with the intensity of typhoon class, PVs with 3 to 3.5 PVU are present in 360K surface-PV field in the cases.
In addition, there is a time-lag of 24 hours between central pressure of typhoon and minimum value of VWS, meaning that the midlatitude upper-level trough interacts with the edge of typhoon with a horizontal distance less than 2,000 km between trough and typhoon. That is, strong midlatitude upper-level divergence above the edge of the typhoon provides a good condition for strengthening the vertical circulation associated with the typhoons. In particular, when the distance between typhoon and midlatitude upper-level trough is less than 1,000 km, the typhoons tend to weaken to STS (Severe Tropical Storm).
It might be mentioned that midlatitude synoptic system affects the intensity change of typhoons Rusa (0215) and Maemi (0314) while they moves northward. Thus, these variables are useful for diagnosing the intensity change of typhoon approaching to the Korean peninsula.
6.
2007.09
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The present study investigated the causes and intensity of the urban heat island phenomenon by the seasons according to the pattern of land use in Chungju City. Highest temperature and lowest moisture areas of the urban were very similar to the distribution of commercial districts, on the other hand, lowest temperature and highest moisture areas were distributed in manufacturing districts, green zones and the Hoam Lake. If appear at intensity of the distance from the outer circumference of commercial districts, wind direction and the rise of temperature, we could observe the remarkable expansion of high temperature from commercial districts toward residential districts around of downwind in all seasons. In case the effect of the wind was not significant as well, high temperature in commercial districts appeared tendency that a little spread to 1, 2 residential districts around. But checked up the intimate relations between the amount of moving heat and wind, when out of consideration that size of area was not much compared than residential areas of downwind affected by the wind. These phenomenon was relatively obvious in summer, the other side, in spring and autumn appeared a similar tendency.
7.
2007.09
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Polychlorinated biphenyls(PCBs) and polybrominated diphenyl ethers (PBDEs) were measured in pine needles of Seoul, and Ansung(GyeongGi-do) to investigate composition, source, and regional concentration of PBDEs. Concentration of total PCBs in Seoul and Ansung showed 608, 945 pg/g DW (mean: 777 pg/g DW), respectively, also concentration of total PBDEs(pg/g DW) in Seoul and Ansung showed 7944, 14,255 pg/g DW(mean 11,100 pg/g DW). Tetrachlorinated biphenyls(Tetra-CBs) and Decabromodiphenyl ethers (Deca-BDE) were detected in relatively high concentration compared to other PBDE congeners in Seoul and Ansung. Correlation coefficients(r) of between PCB congeners in pine needles detected of Seoul and Ansung were significant (r=0.85, p<0.01). It suggested that PCBs concentreation in pine needles may originate from secondary sources such as air-plant partition.
The similarity of between PBDE congeners profile to those of the technical mixture formulation (Bromkal 70-5DE) suggests a source of this product in these sites.
8.
2007.09
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V2O5/TiO2 catalyst impregnated ceramic candle filters are in principle, capable of performing shallow-bed dust filtration plus a catalytic reaction, promoted by a catalytic deposited in their inner structure. Pilot-scale V2O5/TiO2 catalyst impregnated ceramic candle filters were prepared, characterized and tested for their activity towards the SCR reaction. The effect on NO conversion of operating temperature, gas hourly space velocity, amount of deposited catalyst, pressure drops and long-term experiment (life of catalytic filter) was determined. The following effects of V2O5/TiO2 catalyst impregnated ceramic candle filters in SCR reaction are observed: (1) It increases the activity and widens the temperature window for SCR. (2) When the content of V2O5 catalyst increases further from 3 to 9wt.%, activity of NO increases. (3) NO conversion at first increases with temperature and then decreases at high temperatures (above 400℃ over), possibly due to the occurrence of the ammonia oxidation reaction.
9.
2007.09
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The performance of EF (electroflotation) on the thickening of activated sludge were investigated using laboratory scale batch flotation reactor. In this paper, the effects of parameters such as electrode material, NaCl dosage, initial sludge concentration and electrode distance were examined. The results showed that the performance for sludge thickening of the five electrodes lay in: Pt/Ti > Ru/Ti > Ir/Ti > Ti mesh > Ti plate. The more NaCl dosage was high, the more sludge was thickened and the shorter thickening time was obtained. However, considering the final thickening time and sludge concentration, optimum NaCl dosage was 0.5 g/L. Thickening time and sludge concentration was not affected by electrode distance. In DAF (dissolved air flotation) system, optimum recycle ratio was 40% and thickening performance was lower than that of the EF.
10.
2007.09
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Activated carbon was prepared from waste citrus peels by chemical activation with ZnCl2. The optimal condition of carbonization was at 300℃ for 1.5 hr. Activation experiments with carbonized samples prepared at optimal carboniztion condition were carried out under various conditions such as activation temperature of 400 to 900℃, activation time of 0.5 to 2.0 hr, and ZnCl2 ratio of 100 to 300%. In order to investigate the physical properties of the activated carbons prepared, iodine adsorptivities and specific surface areas were measured and their morphologies were observed from scanning electron microscopy. As ZnCl2 ratio increased, activation yield decreased, while iodine adsorptivity and specific surface area increased. The optimal condition of activation was at 300% ZnCl2 ratio and 300℃ for 1.5 hr, and then iodine adsorptivity and specific surface area was measured as about 862 mg/g and 756 m2/g, respectively. SEM photography showed that the surface morphology was changed and many active pore were produced by chemical activation.
11.
2007.09
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This paper presents eco-friendly planting method to overcome the problems of existing concrete retaining wall and gabion retaining wall, respectively, based on the examination on existing concrete and gabion retaining wall. Prior to doing this, proper design method was provided through pull out test. Planting method using gabion metal net and L shape green net retaining wall were compared and analyzed. According to this study, it is confirmed that reduction of construction period and economical profit in construction can be achieved by both manufacturing at the factory and self procurement at the job site as well as the use of metal net, which is applied as a substitution of existing strengthening material. For the effect of planting method, the use of L shape green net retaining wall shows superiority to environment-friendly gabion retaining wall in its ability to rootage and germination of the grass. The L shape green net retaining wall had excellent performance in helping rootage of grass and prevention of soil leakage, and even if raining period, remarkable damage of planting mat does not occur when planting mat is applied.
12.
2007.09
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The aim of this study was to isolate mesophilic chicken feather-degrading bacteria and to evaluate feather hydrolysate as alternative biofertilizer. Isolate RS7 was isolated from compost and identified as Bacillus pumilus according to API analysis and 16S rDNA sequencing analysis. Chicken feathers were completely degraded after 5 days of cultivation at 30℃. Feather hydrolysate treated by B. pumilius RS7 positively influenced Helianthus sannuus L. (sunflower) growth (e.g. growth rate, number and dry weight of leave, and flowering rate). These results suggest that feather hydrolysate prepared using B. pumilius RS7 could successfully be used as alternative biofertilizer, thereby reducing the environmental impact of feather waste from the poultry industry.
