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
제12권 제1호 (2003년 1월) 12건
1.
2003.01
서비스 종료(열람 제한)
This research attempts to describe and explain the development of Korean environmental movement. It finds that the emergence of Korean environmental movement was constrained by the authoritarian nature of Korean politics. In 1970s, environmental movements were primitive and were not organized ones. With the wake of democratization in the 1980s, Korean environmental movement began to get some momentum. And in the 1990s, environmental movement to save clean water has achieved some success in certain areas. However, the emphasis on the growth of local economy in the age of local autonomy system has brought heavy degradation of local environment. The coming of the phenomena of Globalization and Cyber-Age has brought positive effects on Korean environmental movement.
2.
2003.01
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Fifteen major naturally populated habitats around the Mt. Halla, Jeju province for wild Cornus kousa are mostly located on the southeast side of the mountains at 850-1,550m in altitude at sea level and are in half sunney areas. More than 40.0% of the naturally populated area of Cornus kousa are edge of forest areas and 53.3% populate on the steep slope of the mountain in 0-5°. The direction of the slop for about 40.0% of total populated areas is southeast. In the naturally populated areas, total of 64 taxa dividing into 42 families, 59 genera, 56 species and 8 varieties have been shown, mostly Hydrangea petiolaris, Rubus oldhamii, Ilex crenata, Sasa quelpaertensis, Ligustrum obtusifolium. It is suggested that these areas are secondary forest in a typical deciduous forest in Mt. Halla where the second transition had been progressed after forest damage or environmental stress. The index of species diversity of plant groups in these areas is 1.286-4.238 based on the Shannon-Wiener's method.
3.
2003.01
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Urban air quality is usually worse than that of rural counterpart. The contrasting atmospheric properties seem to be direct result of different urban-rural air pollutant emission. Hence, the emission estimation of air pollutants plays an important role to the atmospheric environmental management.
The main purpose of this study is to find out the temporal and spatial distribution of air pollutant emission in Daegu area.
For the study, the Daegu statistical yearbook and data of waste facilities and the report on traffic survey issued by Daegu metropolitan city and the statistical yearbook on the road capacity issued by the ministry of construction and transportation are used. Each item for the emission estimation is SO2, CO, HC, NOx, PM-10 from point, line and area source. The result were as follow;
(1) The air pollutants with the highest amount of emission from the emission source is CO fllowed by NOx, SO2, PM-10, HC in descending order of magnitude.
(2) The annually totaled air pollutant emission consists of 81%(73,185 ton/year) of line, 11%(9,589% ton/year) of area and 8%(7,445 ton/year) of point source in Daegu. Air polluant emission was mainly due to line sources.
(3) High-emission of the air pollutants of line source appeared ariond Bukgu, Dalseonggun, Dongu and Seogu ; the areas with highway networks.
4.
2003.01
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With increasing population densities in cities, underground facilities and entertainment locations are proliferating at a rapid pace in efforts to maximize the use of land.
The purpose of this study is to evaluate CO concentration level of subway stations having underground platforms in Busan Metropolitan City, from September to November 2000, over seven times. The places of inquiry include Yonsan-dong station, Somyon station, Busan station, Nampo-dong station and Dusil station. The samplings were conducted at three points of each station, i.e. gates, ticket gates, and platforms. The component of CO concentration is the main elements of indoor air quality evaluation. The total concentrations and average concentrations of CO were the higher at the Somyon station. The distribution of CO concentrations at each station, generally was higher at gate than ticket gates and platforms. The I/O ratios(I-platforms, O-gates) were expressed highly than 1 at the Yonsan-dong station, Busan station, Nampo-dong station and were lower than 1 at the others.
5.
2003.01
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Magnetite powder for kerosene-based ferrofluid was synthesized by air oxidation of waste acid containing Fe2+ and Fe3+ ions in the pH=11 at 60℃. Stable kerosen-based ferrofluid was prepared by addition of polyoxyethylene nonylphenyl ether(POENPE) to the magnetite containing water. Dispersion mechanism of an addition POENPE to the magnetite was examined by means of the fraction of solid dispersed FT-IR spectrum. And magnetic properties of kerosen-based ferrofluid were examined by method of Vibrating Sample Magnetometer. In order to remove oil on the water surface by an addition of kerosen-based ferrofluid, the optimum conditions were examined.
6.
2003.01
서비스 종료(열람 제한)
This paper have examined the optimum combination of SNCR and SCR by varying SNCR injection temperature and NSR ratio along with SCR space velocity. NOx reduction experiments using a SNCR/SCR combined process have been conducted in simple NO/NH3/O2 gas mixtures. Total gas flow rate was kept constant 4 liter/min throughout the SNCR and SCR reactors, where initial NOx concentration was 500 ppm in the presence of 5% O2. Commercial catalyst, sulfated V2O5-WO3/TiO2, was used for SCR NOx reduction. The residence time and space velocity were around 1.67 sec, 2,400 h-1 and 6,000 h-1 in the SNCR and SCR reactors, respectively.
SNCR NOx reduction effectively occurred in a temperature window of 900～950℃. About 88% NOx reduction was achieved with an optimum temperature of 950℃ and NSR=1.5. SCR NOx reduction using commercial V2O5-WO3-SO4/TiO2 catalyst occurred in a temperature window of 200～450℃. 80～98% NOx reduction was possible with SV=2400 h-1 and a molar ratio of 1.0～2.0.
A SNCR/SCR(SV=6000 h-1) combined process has shown same NOx reduction compared with a stand-alone SCR(SV=2400 h-1) unit process of 98% NOx reduction. The NH3-based chemical could routinely achieve SNCR/SCR combined process total NOx reductions of 98% with less than 5 ppm NH3 slip at NSR ranging from about 1.5 to 2.0, SNCR temperature of 900℃～950℃, and SCR space velocity of 6000 h-1. Particularly, more than 98% NOx reduction was possible using the combined process under the conditions of TSNCR=950℃, TSCR=350℃, 5% O2, SV=6000 h-1 and NH3/NOx=1.5. A catalyst volume was about three times reduced by SNCR/SCR combined process compared with SCR process under the same controlled conditions.
7.
2003.01
서비스 종료(열람 제한)
This study was carried out to obtain the operating characteristics of SMMIAR process for biological nitrogen·phosphorus removal. SMMIAR was operated at HLR(Hydraulic loading rate) of 39.6, 52.8, 63.4 and 79.2ℓ/㎡/d respectively and the operating parameters such as intermittent aeration time ratio of aerobic/anoxic, DO and microorganism concentration were changed to confirm the optimum operating condition. The concentrations of the wastewater BOD, TN(Total nitrogen) and TP(Total phosphorus) were 150, 30 and 7.5㎎/ℓ respectively. Achieving better removal efficiencies of BOD, TN and TP up to 90, 85.4 and 95.4% respectively, we must keep in operation condition of SMMIAR by 0.75 of time ratio of aerobic/anoxic and by minimum 45 minutes of oxic period simultaneously.
8.
2003.01
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Effective alginate extraction from waste-brown seaweeds was studied. The waste-brown seaweeds almost consist of stems of seaweeds. Alginate could be obtained from the stems as well as leaves of seaweed. Ultrasonic vibration(47kHz) facilitated filtering step in the alginate extraction process. Among various alkalies for alginate extraction, NaHCO3 was most appropriate concerning use of dealginates. The yield of alginate extraction using NaHCO3 2wt% solution was 19.3% at 60℃. The dealginates from NaHCO3-extraction process have been found most suitable food for red-worms.
9.
2003.01
서비스 종료(열람 제한)
When houses or buildings are adjacent to roads, with no effective prevention of road traffic noise, neighbors are exposed to it. It is important to understand the properties of sound propagation before taking a counter- measure against road traffic noise. It is easy to estimate the properties of sound propagation without obstacles, but very difficult and complex to estimate them with ones. The purpose of this study is to present a useful tool that can estimate the properties of sound propagation. In the beginning of this study, we investigated the attenuation of road traffic noise with two pillar buildings, and presented practical approximate calculation method, and verified that through scale model.
The outcomes from this study are as follows : ⑴ Over second reflection sound waves can be ignored. ⑵ Diffraction sound waves that happen when reflection sound and first diffraction wave are projected at the wedge of other building can be ignored.
10.
2003.01
서비스 종료(열람 제한)
The interaction of mastoparan B, a cationic tetradecapeptide amide isolated from the hornet Vespa basalis, with phospholipid bilayers was studied with synthetic mastoparan B and its analogue with Ala instead of hydrophobic 12th amino acid residue in mastoparan B. MP-B and its derivative, [12-Ala]MP-B were synthesized by the solid-phase peptide synthesis method. MP-B and its analogue, [12-Ala]MP-B adopted an unordered structure in buffer solution. In the presence of neutral and acidic liposomes, the peptides took an α-helical structure. The two peptides interacted with neutral and acidic lipid bilayers. These results indicated that the hydrophobic face in the amphipathic α-helix of MP-B critically affected the biological activity and helical content.
11.
2003.01
서비스 종료(열람 제한)
The study was carried out to evaluate the new analytical method of phthalate esters(diethylphthalate, di-n -butylphthalate, butylbenzylphthalate, bis(2-ethylhexyl)phthalate), one of the endocrine disruptors, which were performed by GC/MS-SIM(selected ion monitoring). The phthalate esters were extracted from water samples using solid-phase extraction on C18 columns. It investigated that the extraction recovery rate of phthalate esters with different solvents and solvent volume. The optimal solvent was dichloromethane and proper volume of dichloromethane for recovery of phthalate esters was 4 mL. There were good linearities(above R2=0.9975) in the range 0.01～0.50㎎/L, and the detection limits were below 0.01～0.03㎍/L. The recovery rates, RSD and MDLs for phthalate esters were 80～114%, 5.0～8.1% and 0.03～0.11㎍/L, respectively. This method shows a good precision of phthalate esters.
12.
2003.01
서비스 종료(열람 제한)
Synchronous spectrofluorimetry was carried out for the simultaneous determination of various polycyclic aromatic hydrocarbons(PAHs) in aqueous solution by fluorescence spectrometry have been studied. The optimal wavelength interval(Δλ) for synchronous spectra of acenaphthene, anthracene, benzo[a]anthracene, fluorene and pyrene were investigated in the presence of surfactants. The great enhancement of the fluorescence of these PAHs in Triton X-100 was obtained and optimal wavelength was 50 nm. The calibration curves in synthetic mixture solution of 5 PAHs were linear over the range from 1.0×10-8M to 1.0×10-4M. Under the optimal experimental conditions, the detection limits were 4.9×10-9M, 7.0×10-9M, 4.7×10-9M, 1.6×10-9M and 3.2×10-9M for acenaphthene, anthracene, benzo[a]anthracene, fluorene and pyrene, respectively.
