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
제8권 제1호 (1987년 6월) 7건
1.
1987.06
구독 인증기관 무료, 개인회원 유료
The learning subjects of primary and secondary levels of educational astronomy appears in cyclic developmental phases throughout education levels. To improve their learnings effectively, it is important to study the correlations of conceptional connection between previous and succeeding learnings, In this study, we select the astronomical unit subjects from the primary and secondary levels of science text books, analysing the conceptional connections between each unit subject and the unit subject of it's previous learning. We finally find that the conceptional connections of each unit are generally well made. Several units, however, have neither connections nor previous learnings which are reexamined, Therefore, we discuss the fitness of intellectual levels of students and the motives of interests to compensate the incomplete conceptional connections.
4,800원
2.
1987.06
구독 인증기관 무료, 개인회원 유료
In order to explain the apparent alternation in VLA jet structures, we appeal to evaporation from an outer disk to switch the direction of the central energetic flow by a process of 'optical depth modulated' choking, That is as the radiation from a central engine heats the surface of an extended disk surrounding the engine, the disk surface will evaporate thermal gas, expanding the disk atmosphere and creating a disk wind. We argue that its dynamic pressure plays a very important role in confining the central energetic flow. If the disk has initially an asymmetric density distribution in the upper and lower atmospheres (i. e., asymmetric distribution of optical depth), then this can initiate the alternating jets(flip-flop jets), A flip-flop time scale is calculated from the rate of optical depth variation in the disk atmosphere(e.g., the optically thin atmosphere becomes optically thick due to the mass influx from the central engine), This gives a time scale of 3×10^7 yrs, which value, however, is strongly dependent on the size of the jet cavity where in the density(optical depth) is varied. We compare the theoretically derived flip-flop time scale to those estimated observationally for the standard straight, as well as the rotationally and mirror symmetric radio sources. The prediction is found to be reasonably consistent with the observationally derived time scales of the standard straight radio sources, however it is likely to be longer than those in the rotationally and mirror symmetric radio sources.
4,000원
3.
1987.06
구독 인증기관 무료, 개인회원 유료
Fluid in a rotating coordinate generally flows along equi-potential vorticity line. Without disturbances such as dissipation, rapid vertical mixing, and external forcing such as energy exchanges, potential vorticity is conserved in the thermally and dynamically closed system. This study is the first trial to investigate the potential vorticity in the East Sea. The purpose of this study is to show the distribution of the potential vorticity due to the variation of sea water density and topography in baroclinic and barotropic conditions. The conclusions are given as follows. First, vertical mixing is well striking in February than in August, and flow patterns in February are different from those in August. Secondly, contour lines of isotrophe is similar to bottom topography, while potential vorticity is similar to the distribution of dynamic topography. Thirdly, the circulation of the East Sea Water flows approximately along contours of potential vorticity in the region of high baroclinicity and along those of isotrophe in other region.
4,000원
4.
1987.06
구독 인증기관 무료, 개인회원 유료
This study has been attempted to find out how the learning with the introduction of the physical environmental variant in earth science teaching-learning scene in high school can be approached to the goals of science education. And it also aims to seek for an effective teaching method of earth science education. The effectiveness of learning between two groups has been compared: the experimental group and the control group. According to the result of this research, the effectiveness of learning of the experimental group in the science branch of high school has been much higher than the control group while in the humanities branch, the effectiveness between the two groups is not conspicuous. In conclusion, the result of introducing suitable environmental variant into teaching-learning scene enhances the effectiveness of learning, and can be one of the desirable approaches to science education.
4,000원
5.
1987.06
구독 인증기관 무료, 개인회원 유료
The deflection of the vertical and the geoid height in the southern part of the Korean peninsular were computed from gravity anomalies by the application of the Fourier and Bessel-Fourier series. The deflection of the vertical computed from free-air anomaly has highest values of 7∼8$quot; around the central part of the Taebaek and Sobaek Mountains. The general direction appears to be nearly perpendicular to the NNE-SSW direction of the general tectonic structure of the peninsular. The geoid height increases to the south-east direction and the difference on the peninsular is about 3 m. The undulation of the Bouguer geoid appears to be correlated with the crustal thickness, having highest values on the eastern and southern coasts. The geoid height computed by using the geopotential coefficients up to the 16th order obtained from the spherical harmonic analysis of the satellite data shows similar trend of increase but much higher value than that of free-air geoid.
4,000원
6.
1987.06
구독 인증기관 무료, 개인회원 유료
Natural environment and human activities in King George Island, South Shetland Islands in West Antarctica have been briefly reviewed, It is sure that human being can live a normal life in the Island, although the insufficiency in space and water resources might be a hampering factor to further human activities in the Island. It seems necessary to protect natural environment against the recent frequent visit of human beings to the Island.
5,400원
