간행물
한국지구과학회지 KCI 등재 The Journal of The Korean Earth Science Society
- 발행기관 한국지구과학회
- 자료유형 학술지
- 간기 격월간
- ISSN 1225-6692 (Print)2287-4518 (Online)
- 수록기간 1979 ~ 2024
- 주제분류 자연과학 > 지구과학 자연과학 분류의 다른 간행물
- 십진분류KDC 450DDC 550
권호리스트/논문검색
제9권 제2호 (1988년 12월) 9건
1.
1988.12
구독 인증기관 무료, 개인회원 유료
This paper discusses heavy mineral assemblages, organisms and micropaleontology from the eastern beach sediments of Fildes Peninsula, King George Island, South Shetland Islands. The aims of this paper are to present preliminary results and to give clues to future research of the study and/or related areas. Heavy mineral assemblages are composed mainly of altered mineral and opaque minerals, clinopyroxenes, amphiboles and epidote. Most of the heavy minerals are derived from volcanic rocks present in Fildes Peninsula. However, relatively high content of mica suggests it might be originated not to be from volcanic rocks of Fildes Peninsula, but to be from acidic rocks present in other areas around Maxwell Bay. Cluster analysis of the data(Q-mode) using UPG method shows three facies: represented by Ardley Cove Hydrographers Cove, and the southern tip of Fildes Peninsula. Hydrographers Cove is separated from Ardley Cove by Ardley Island, and is somewhat protected from the strong wave action of Maxwell Bay. On the other hand, Ardley Cove and the southern tip of Fildes Peninsula are open to the strong wave action of Maxwell Bay. The benthic organisms of the study area is mainly consist of interstitial animals such as very small-sized polychaetes, gastropods, turbellarians and nemertines. Polychaetes are the dominant faunal group as seen in other areas of South Shetland Islands. Occurrence of Foraminifera and Ostracoda seems to reflect faunal ecology and sedimentary environment of the study area. It is recommended that a rather large sample size($gt;1 liter) be made for a quantitative study of micropaleontology and benthic ecology of the areas similar to the study area.
4,000원
2.
1988.12
구독 인증기관 무료, 개인회원 유료
The aim of this study is to provide useful advices and basic data for the future Earth Science Education by analyzing the High School Earth Science textbooks. The analysis included 1) whether the contents of the textbook are properly selected suiting with Piaget's Intellectual development stage 2) whether the basic concept and successive concept are properly selected and organized. This study arrived at the following conclusions. 1) The greater part of highschool students are not able to think the formal operation when they are in need of thinking power in formal operation in the study of 48.696 of curriculum. 2) The contents of Earth Science textbook should be developed naturally from the concrete operation stage to the formal operation stage, but the methods of approaching curriculum are scattered through out the textbook. 3) There are many lessons that can't be practiced in laboratory. The textbook should be developed naturally from the simple structures to the complicated ones. Also it is necessary for teachers to conceive those problems and to be able to help the students approach the curriculum easily.
4,000원
3.
1988.12
구독 인증기관 무료, 개인회원 유료
The purpose of this study is to investigate basic parameters which are essential for tidal correction of gravity data. This study involves computation of the theoretical values and laboratory measurements of tidal force of gravity. The theoretical variation of tidal force was computed according to the relative position of moon and sun on the celestial sphere by using a computer program Gravity measurements were carried out in Seoul University for 120 operation-hours, and also in coastal area in Incheon for 48 operation-hours. The gravimetric factor (δ) and phase delay were determined by comparing theoretical values with measured gravity data. Summarized results of this study are as follows ; (1) The gravimetric factor in Seoul is in the range of 1.22∼1.36(avg.=1.28) and the phase delay is in the range of 0.1∼0.3 hours (avg.=0.16 hours). (2) The mean garvimetric factor in Incheon is 1.31 and mean phase delay is 0.025 hours (3) The difference of mean gravimetric factor between in Seoul and in Incheon is 0.03 and that of phase delay is 8 minutes.
4,000원
4.
1988.12
구독 인증기관 무료, 개인회원 유료
This study was conducted to understand the variation characteristics of suspended solid in the Keum River Estuary. Water sampling was carried out regularly with response to the tidal cycle from September, 1986 to August, 1987. Analyzed or observed items were sea water temperature, salinity, TS, TDS, TSS, VSS, FSS. and also the relationships between wind velocity, precipitation, tidal cycle and TSS were investigated. It is found that the sea water temperature is the lowest in January(2.5℃)and the highest in August(24.4℃), and increases toward upstream in summer and vice versa in winter. Salinity is the lowest in August (13.6‰) and the highest in December(20.3‰), and the annual mean value shows 13.6‰. TS and TDS are firmly related with the variation of salinity, thus, high in spring and low in summer. The annual mean values of TSS in 199.8(65.3∼454.5)㎎/ℓ, highest in March 308.2(67.5∼792. 3)㎎/ℓ and lowest in June 36.8(10.9∼200.0)㎎/ℓ. The annual mean values of VSS is 22.0㎎/ℓ, its variation tendency is similar to that of TSS. The annual mean value of VSS /TSS ratio is 13.9(6.8∼20.2)%, which are not high level compared with those of polluted sea areas. This ratio is high in summer(24.1%) and low in autumn(13.3%), and increases toward the downstream direction. It is also revealed that TSS shows a positive correlation with the wind velocity(r=0.59), and a negative with the precipitation in the Keum River basin(r=-0.64). TSS concentration is primarily subjected to the tidal range and the freshwater discharge and also related to the resuspension of bottom sediments by the action of wind force or wind waves. The dilution rate is strongly subjected to the seasonal variation of the freshwater discharge, therefore, TSS concentration shows low in summer and high in winter. Under low discharge condition in spring, autumn and winter, TSS, VSS are high level in spring tide compared with those in neap tide : under high discharge condition in summer, these values are reversed that is, TSS is higher in neap tide than in spring tide.
5,500원
5.
1988.12
구독 인증기관 무료, 개인회원 유료
A model for the galactic distribution of stars is developed by fitting IRAS 12㎛ source counts to the two-component density distribution of an exponential disk and an R~ spheroid. The model can reproduce the IRAS source counts fairly well when we assume the late type M giants mainly contribute to the 12 ㎛ luminosity function. By fitting the source counts we find he scale length and the scale height of the exponential disk are 2.2kpc and 300pc respectively. The axial ratio of the de Vaucouleurs spheroid is suggested to be 0.85, and the local spheroid to disk population ratio is found to be 1/300.
4,000원
6.
1988.12
구독 인증기관 무료, 개인회원 유료
We have considered the mass loss effects on the analytical PMS stellar evolutionary model of Stein(1966). In this calculation, we have assumed the mass loss law, M˙=K(L/C)(R/GM)'-,which should be reasonable for PMS stellar wind mechanism. The numerically obtained evolutionary tracks in H-R diagram indicate that the higher mass losses PMS star have, the later they reach the radiative equilibrium. We have considered the composition effect on the evolution such as the composition difference between Pop. I and Pop. II PMS stars. We have also compared the tracks under the mass loss law, M˙=K'LR/GM.
4,300원
7.
1988.12
구독 인증기관 무료, 개인회원 유료
4,000원
8.
1988.12
구독 인증기관 무료, 개인회원 유료
4,600원
9.
1988.12
구독 인증기관 무료, 개인회원 유료
A simple analytic model has been made to describe the radio appearance of nonspherical stro¨mgren region(e. q. comet-shaped H II region), assuming that(1) ionizing photons are conserved to a given solid angle within which they are emitted, and (2) a supersonic motion of a surrounding medium creates a shocked region in front of the non-spherical Sro¨mgren region. On the basis of this calculation, a model for the cometary H II region G34. 3+0.2 has been constructed to obtain dynamical parameter of the surrounding medium(V=100㎞/tsec at a_0=1㎞/sec)with a value of n_u=103㎝^(-3). The theoretical radio appearance of the model reproduces both the emission maximum at' the head part and the dominant shell structure as the radio observation of G34.3+0.2 has displayed.
4,000원
