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Medels of the Electron Configuration and the Orbital of Atoms were studied with a vinyl cord, thread, button, and wire. The usual molecular models(old type) were inadeqnate to represent bond angles and new quantum concept of s,p,d and hybridization orbitals. K.Nakanishi (Japan) had been tried to improve models of the electrom configuration and orbital of the atoms made by wire spring, magnetic bar, and clamp, recently. The models introdnced here were much convinient and inexpansive compared with Nakanishi models. The electron configuration model of s.p.d orbitals, hybridization concept, and major ten moleculer structures were studied.
This study deals with the water quatity of Ge-ryong water reservior in Kong-ju. Water samples which were taken from five sampling sites in Ge-ryong reservior were tested for 19 important water quality items four, times in the year seasonaly, 1984. The average water qualities of Ge-ryong water reservior were within the limitation of the standard drinking water. But pH values were little bit exceeded to the alkalinity and the test result of BOD as well as DO were within the second class drinking water standard.
This study was dealt with the water quality of the most famous six mineral springs and one warm spring located in Chung-chung district, near Dae-jon. Tests were made three times in July and Octover, 1978 and in December, 1979. Testes were included twenty two itemes. The obtained results were summerized as follows. 1. The quality of mineral water at six places new overwhelm the limitation of drinking water. 2. But, these were rather proper for the specific drinking water at Bu-gang for illness just like Fe is good for the anaemia. 3. The quality of the mineral water at Cho-jeong was good and proper for making soda drinks.
This study was dealt with the water quality of the most four famous mineral springs located in Chung-chung district near Kong-ju. Tests were made twice a year October and November, 1997. Tests were included water temp, turbidity, pH, conductivity, total hardness, ??, ??, ??, DO, COD, CO₂, alkalinity, acidity and ??. The obtained results were summerized as follows. 1. The quality of mineral water at four places were overwhelm the limitation of drinking water standard. But these were rather proper for the specitic drinking water for the illness just like ?? is good for the anaemia. 2. The CO₂ content of the mineral water at Cho-jeong was the largest 20.9me/ℓ (pH3.8) and proper for making soda drinks.
This study was dealed with the water quality of Gum River Resorvior at Kong-Ju. Seven sampling sites along the river and one sewage stream of Jemin Chun were surveyed monthly for 29 important water quality items from May to November, 1982. Jemin Chun passing through the heart of Kong-Ju city was already overwhelmed the limitation of third class standard industrial water quality. The average water qualities of the Gum River around the Kong-Ju were almost just within the limitation of the standard drinking water, but some items were a little bit exceeded during the summer or drain season of the year. Installation of adequate sewage water treatment plants near the big cities are recommended.
This survey is to study the corresponding degree of water pollution of the Kum river areas, covering the eight places of main stream of the river from the Daechung dam to Kangkyung county, and two trivutary streams of Kap stream, and Miho stream. Besides, the heavy metal content of the fishes, shellfish, moss, and soil in the main stream of Kum river is investigated, whose results are as follows: 1. The water quality The water quality of the area from the Daechung dam to the Sintanjin county is first grade for the standard of drinking water in terms of BOD, COD values, that of both Kap stream and Miho stream is third or fourth grade respectively, and the other areas are turned out to be second grade. The water of the Daechung dam to the Sintanjin has little NO₂-N and ??, which can be said to be possible for the drinking water. The quantity of ?? and ?? in the water of all the areas is below the standard for the available drinking water, but, that of Kap stream and Miho stream is about two or three times higher than other areas. 2. Heavy metal The content of Cd, Cu, Mn, and Zn are shown to be comparatively less than that of Co, Fe, Ni, and Pb. And the content of Cu, Mn, Zn are less than the possible standard value for the drinking water. The relationship of the heavy metal content of the fish and shellfish were in order of Co>Zn>Cu>Cd, for the moss, Zn>Pb>Co>Cu>Cd, and for the soil, Zn>Pb>Cu>Co>Cd. The most of collecting samples in the Kumnam area have lots of heavy metals, and Pb is well contained in shells than fishes. When summarize the above result, the water in the Daechung dam and Sintanjin area is comparatively favorable for the drinking water, and the water quality below the Kumnam areas appears to be wores because of influx of Kap stream and Miho stream. In short, the necessary counter measure is to be required for the good preservation of water of fine quality in Kum River.
This paper was dealed with current status of chemistry education presented by fiftythree high school teachers with questions(1971). The questions are analyzed, summerized, and some comments are postscripted. There were many difficulties in teaching chemistry; heavy teaching load, extra official load, poor budgget, shortage of facilitsies and equipments, unreasonable use of appointed budgget in management, and too heavy burden for entrance examination which is apt to demand memory rather than understanding the natural principle and law. As a plan of improvement of current science education, the matters of policy and the matters of reunderstanding of science education on the bases of philosophy are proposed.
In this study a few laboratory teaching materials have been developed to be available for the effective performance of experiments and practices- a heart of inquiry learning-as a continuance of 'A study on the Development of Laboratory Teaching Materials for Middle School Science Course I' The present condition of science education has been investigated by means of questionaires, interviews and literature, the results of the present condition and problems in junior high schools are as follows: 1. The hours for science classes are considerably little for the teaching contents of science textbooks. 2. The level of teaching is beyond the student's capability in terms of their experience and intellectual development. 3. Science teachers are overburdened with much tasks, and laboratories and laboratory facilities are too insufficient and furthermore teaching is mainly conducted on the lecture method as a preperation for various entrance exams. 4. Teachers' eagerness and desirable attitude for teaching are required. In this study, materials for every branch of science have been developed to be available for the effective performance of experiments and practices through inquiries. The materials developed in this study are as follows: 1. In physics, measure apparatus of extremely small masses, length, and very little time intervals are developed. 2. In chemistry, new methods for gas generating apparatus and materials. are developed. 3. In biology, the size of quadrate and the method to decide the time in facilitating for the purpose of survey of botany community are introduced. The results of the investigation of natural enemy on Hyphantria cunea, and the study on collecting, breeding of Planaria are also shown. 4. In earth science, the laboratory teaching materials are developed for observing continuous spectrum and line spectrum. Putting the above results of study together, the suggestions are made to the effect as follows: 1. The quantity of learning should be reduced and the levels lowered in the new textbooks. 2. The development and distribution of various teaching materials(film, T,P., cassettes film, supplementary, textbook, program teaching material, individual learning material) is required. 3. The experimental instruments should be timely manufactured and distributed on the basis of effective administrative support to ensure their solidity and accuracy. 4. The concrete design to eliminate the teacher's burden should be contrived and the system for senion teachers in charge of science teaching in secondary schools, should be improved. 5. Teacher's research activities should be encouraged through various research institutes(Institute of science education , graduate school of education and the other research institutes.) 6. The disposition of laboratory assistant should be considered. 7. More positive supports from other societies relevant with education are much expected to be made.