• The Korean Journal of Quaternary Research
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• v.22 no.2
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• pp.42-42
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• 2008

• The Korean Journal of Quaternary Research
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• v.22 no.2
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• pp.43-44
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• 2008

In this brief present are about some advanced results from investigation geomorphology in basin of river Tui and distribution of relief their peculiarities, types morphogenetic, convert to ekzogen process of relief ( fluvial system, permafrost process, wind process, slope process etc) and dynamic process of sedimentation.

• Proceedings of the Korean Quaternary Association Conference
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• 2002.12a
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• pp.100-101
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• 2002

• The Korean Journal of Quaternary Research
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• v.18 no.2 s.23
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• pp.43-46
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• 2004

• Journal of The Geomorphological Association of Korea
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• v.28 no.1
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• pp.67-81
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• 2021

Geomorphological development and distribution at the macro scale provide a clue to the geotectonic characteristics that have affected the geomorphological system. This is because the developmental characteristics and distribution of the landform at the macro scale remain spatial characteristics due to tectonic processes, such as fault activity. From the perspective of tectonic geomorphology, this study identified the developmental characteristics and distribution of the Quaternary landforms in central-southern Yangsan fault and discussed its relevance to fault activity. In this paper, we presented examples and results of morphotectonic analysis of the Yangsan fault, and will present the results of age dating, stratigraphic relationship of the Quaternary landforms, and calculation of cumulative slip rate in the next paper.

• The Korean Journal of Quaternary Research
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• v.31 no.2
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• pp.13-22
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• 2017

The age of the Sorori old fluvial deposits is assumed as old as Last Interglacial(MIS 5) when appying the thalassostatic terrace formation in mid- to downstream Keum river basin, while the young fluvial deposits are interpreted to be formed since the post-LGM(last glacial maximum), including both the Bølling-Allerød (B/A) Interstadial(12,700~14,700 cal-yrBP), and the Younger Dryas Stadial(11,700~12,900 cal-yrBP). The wild rice seed like Oryza rufipogon found in the middle organic muds of the young fluvial deposits dated after about 15,000 cal-yrsBP, when the transition from the subalpine conifer forest to the deciduous broad-leaved forest was conspicuously evidenced in the upper part of OC-2 palynofloral zone of the in Cheonju Sorori site, In particular the OC-2 palynofloral zone ranging towards the upper part of middle organic muds(peaty muds) is interpreted to be formed in the B/A Interstadial. It is regarded that Cheongju Sorori rice seeds are associated with warm palynological evidences and backswamp insects during the Lastest Glacial, showing appearance of relatively warm climate similar to the present.

• Journal of Powder Materials
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• v.12 no.4 s.51
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• pp.303-308
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• 2005

Various kinds of Mg-Zn-Ca base alloys were rapidly quenched via melt spinning process. The meltspun ternary and quaternary alloy ribbons were heat-treated, and then the effects of additional elements on age hardening behavior and phase change of precipitates were investigated using Vickers hardness tester, XRD, and TEM equipped with EDS system. In ternary alloys, age hardening was mostly due to the distribution of $Mg_6Ca_2Zn_3$ and $Mg_2Ca$. The stable phases of precipitates were varied according to the aging temperature and the alloy composition. With the increase of Ca content, $Mg_2Ca$ precipitates were detected more than $Mg_6Ca_2Zn_3$ precipitates. In quaternary alloys, the precipitates taken from Mg-Zn-Ca-Co were identified as new quaternary phase, whereas those taken from Mg-Zn-Ca-Zr as MgZnCa containing Zr. In general, the ternary alloy showed higher peak hardness and thermal stability than the quaternary considering the total amounts of the solutes. It implies that the structure of precipitate should be controlled to have the coherent interface with the Mg matrix.

• YAKHAK HOEJI
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• v.35 no.3
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• pp.182-189
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• 1991

Systematic study on the extraction of ion pair by the use of picric acid (PCA) as an ion pair forming reagent to the aliphatic amines has not be done by spectrophotometric method. The extraction of ion pair by the use of PCA and 23 kinds of the aliphatic amines was examined. The procedure is as follows; Elving's buffer solution (pH 1.3~10, ionic strength 0.5) each amine solution, and PCA solution were taken into a test tube. The mixture was shaken mechanically with chlorform. The organic phase was filtered through a filter paper to remove water droplets. The absorbance was examined at $\lambda_{max}$ against a reagent blank. Primary and secondary whose carbon number were more than 7 or 6, respectively, are extractable as ion pairs with PCA, while tertiary amines and quaternary ammonium salts are also extractable without the correlation of carbon number. It was considered that the ion pair extraction of primary and secondary amines was affected by the number of carbon of amines, but its extraction of tertiary amines or quaternary ammonium salts was affected by kind of aliphatic amines rather than pKa values or carbon number of amines.

• Clean Technology
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• v.20 no.2
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• pp.136-140
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• 2014

The quaternary alloy (Co/Ni/P/Mn) coatings were prepared using electroless plating on the polypropylene. Compositions of the quaternary alloys (Co/Ni/P/Mn) were controlled by the amount of agents. The composition by EDS, morphology with SEM, film thickness, and surface electrical resistance of the samples were measured. Higher phosphorous content samples give larger electric resistance, thus a relationship is admitted between P content and electric resistance. The corrosivity of the coatings were evaluated by electrochemical methods in the 3.5 wt% NaCl and 5.0 wt% $H_2SO_4$ solutions, respectively. It was concluded that phosphorous addition enhances resistivity in the corrosion.

• Economic and Environmental Geology
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• v.37 no.3
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• pp.325-334
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• 2004

Detail downward variation records for paleomagnetic, XRD, photospectrogram, TOC results were obtained from the soil developed along the Hantan River, Gungpyeong-ri, Cheongsan-myeon, Yeoncheon-gun Gyeonggi-do. The unconsoildated sediments underlain by the Jeongok Quaternary Basalt indicates that the paleosol formed twice with different ages, as apparently indicated by sedimentological, paleomagnatic, and soil chemical properties. The paleosols recorded paleoclimate and paleoenvironments of about 271.21$\pm$89.8 ka before eruption of the Quaternary Jeongok Basalt.