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ENVIRONMENTAL SCIENCES

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수록정보
수록범위 : 1권1호(1997)~11권2호(2002) |수록논문 수 : 107
ENVIRONMENTAL SCIENCES
11권2호(2002년 11월) 수록논문
최근 권호 논문
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1Flocculation Characteristics of Kaoline Suspensions in Water by Cationic Polyelectrolytes

저자 : Sang Kyu Kam , Dae Kyoung Kim , Chang Seong Moon , Byung Churl Ko , Min Gyu Lee

발행기관 : 한국환경과학회 간행물 : ENVIRONMENTAL SCIENCES 11권 2호 발행 연도 : 2002 페이지 : pp. 93-102 (10 pages)

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Using a simple continuous optical technique, coupled with measurements of zeta potential, the flocculation characteristics of kaoline suspensions of different content(15, 35 and 55 NTU) by several cationic polyelectrolytes, has been examined. The optimum mixing is obtained under a constant stirring of 200 rpm, differently from a general flocculation test. The charge density of a polyelectrolyte is important in determining the optimum dosage and in the removal of kaoline particles. The optimum dosage is less for the polyelectrolye of higher charge density and is the same regardless of kaoline content. At the dosage, the removal of kaoline particles is higher for the polyelectrolye of higher charge density and zeta potential of kaoline particles reaches to near zero. The rate of adsorption and flocculation rate have been found to be affected by charge density and molecular weight of a polyelelctrolyte and the content of kaoline particles.

2A Study on the Applicability of the Kinematic and the Static GPS Methods for Coastal Ocean Structure Survey

저자 : Byung Gul Lee , In Jun Kang , Sung Kee Yang

발행기관 : 한국환경과학회 간행물 : ENVIRONMENTAL SCIENCES 11권 2호 발행 연도 : 2002 페이지 : pp. 103-110 (8 pages)

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The position fixing usually is determined by triangulation, traverse surveying and astronomy surveying. However, when the station is moving, it is impossible to determine its position continuously by the former method. By a satellite positioning method(GPS), this problem can be solved. In our study, we used two methods to determine the length and coordinate of a point position. One is a kinematic GPS method and the other is a static one. Each is based on carrier phase measurement and employs a relative position technique. We implemented observation experiments such as Geodimeter and DGPS(Differential GPS) successfully. To estimate the accuracy between the kinematic and static methods, we compared the results of Geodimeter, the kinematic, and the static. The results showed that the static is relatively a little more accurate than the kinematic. However, in the kinematic mode, when we received the GPS data for a long time, we found that the kinematic also had a high accuracy value for the length survey. Finally, we applied the GPS to Jeju Harbor Breakwater to examine the applicability of GPS for coastal ocean structure based on the kinematics and the statics, respectively.

3Asian Dust Transport during Blocking Episode Days over Korea

저자 : Yun Seob Moon , Yoo Keun Kim , Kimberly Strong , Yun Kyu Lim , In Bo Oh , Sang Keun Song , Joo Hyon Bae

발행기관 : 한국환경과학회 간행물 : ENVIRONMENTAL SCIENCES 11권 2호 발행 연도 : 2002 페이지 : pp. 111-120 (10 pages)

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Asian dust(or yellow sand) occurs mainly in spring and occasionally in winter in east Asia, when the weather conditions are under an upper trough/cut-off low and surface high/low pressure system during blocking episode days associated with the stationary patterns of the upper level jet stream. The transport mechanism for Asian dust during the blocking episode days in spring 2001 was analyzed using the TOMS aerosol index and meteorological mesoscale model 5(MM5). Based on the E vector, and extension of an Eliassen-Palm flux, the blocking episode days were found to be associated with the development of an upper cut-off low and surface cyclones. Concurrently, the occurrence of dust storms was also determined by strong cold advection at the rear of a jet streak, which exhibited a maximum wind speed within the upper jet stream. As such, the transport mechanism for Asian dust from China was due to advection of the isentropic potential vorticity(IPV) and isentropic surfaces associated with tropopause folding. The transport heights for Asian dust during the blocking episode days were found to be associated with the distribution of the isentropes below the IPV. At the same time, lee waves propagated by topography affected the downward motion and blocking of Asian dust in China. The Asian dust transported from the dust source regions was deposited by fallout and rain-out with a reinforcing frontogenesis within a surface cyclone, as determined from satellite images using TOMS and GMS5. Accordingly, these results emphasize the importance of forecasting jet streaks, the IPV, and isentropes with geopotential heights in east Asia.

4Taxonomy of Asian Geranium L.(Geraniaceae) based on fruit and seed morphology

저자 : Seon Joo Park , Hong Duok Park

발행기관 : 한국환경과학회 간행물 : ENVIRONMENTAL SCIENCES 11권 2호 발행 연도 : 2002 페이지 : pp. 121-130 (10 pages)

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Compare to investigate the taxonomic utility of infragenera system and interspecific of Asian Geranium, we examined the fruit and seed morphology from 35 taxa. The fruit shape and seed's dispersal way did so that may divide subgenus or some part section to do could reason evolutionary trends. That is, at seed dispersal, the awns of section Geranium of subgenus Geranium, ramains attached at the top of rostrum, though fairy easily broken off, because seed increases awn's elasticity by diffusive way, it is long characteristic seed's dispersal distance, and subgenus Robertium observed that seed dispersal distance is short because it is no awn's elasticity by way that seed dispersal is gone as awn drops with rostrum. Also, section Geranium of subgenus Geranium and subgenus Robertium act role that awn keeps temporarily breed swerving with mericarp instead of bristle because section Tuberosa of subgenus Geranium is not bristled function that keep temporarily breed because mericarp bristled on base at seed dispersal do while. Therefore, is thought that is taxon that when consider formation's development and function regarding this seed dispersal function, subgenus Geranium evolves more than subgenus Robertium. Seed morphology can divide by 2 subgenera(Geranium, Robertium) according to pattern of seed coat. and Seed's morphology characteristic(whole shape, color, form of seed apical and base, micropyle area, hilum area, chalaza, and position of seed hilum area), can distinguish some species, but is thought that is not reasonable as for discernment characteristic form and nature by repetition of characteristic form and nature. Especially, infrasection do in fruit and seed's morphology that is handling in this research that know to argue classification system and relationship by repetition of characteristic form and nature difficult. To all reliable truth, cytological, ecological, embryology, and molecular genetics research about taxon is considered that should be achieved section Geranium that do not handle yet.

5Chemical Properties of Co(2) Compound Containing Endocrine Disruptor, Bis-Phenol A

저자 : Chil Nam Choi

발행기관 : 한국환경과학회 간행물 : ENVIRONMENTAL SCIENCES 11권 2호 발행 연도 : 2002 페이지 : pp. 131-137 (7 pages)

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The chemical behavior and properties on the redox state of environmental pollutant has been investigated by electrochemical methods. We carried out to measure the variations in the redox reaction of differential pulse polarogram and cyclic voltammogram. The results observed the influences on redox potential and current of various factors with temperature and pH. These were established factors as the effect of the redox reaction. It can be clearly recognized that the electrode reaction are from qusi-reversible to irreversible processes. Also, it was mixing with reaction current controlled. The bis-phenol A in the waste water was made to compound with cobalt ion and it take away from the separation into compound. The Co(BPA)_(2) compound was not found to be dissociation in waste water. However, this compound is a very unstable(K=1.02) and for a while, it was to be a dissociation. Therefore, we believed that it was likely to a toxic substance.

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