• Journal of the Mineralogical Society of Korea
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• v.17 no.2
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• pp.123-133
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• 2004

Carbonate minerals are examined by cathodoluminescence microscopy and chemical analysis to characterize the carbonate materials occurring in the Tertiary marine basin. The microscopic technique with cathodoluminescence gives new informations that are not obtainable by conventional microscopic techniques. The carbonate cements in sandstones appear to be uniform with transmitted light or with crossed prisms. but the inspection with cathololuminescence reveals foraminiferal tests and rhomb crystals in the carbonate cements. The chemical analysis indicates that the intense luminescence depends mainly on the presence of$ Mn^{ 2+}$ and $Fe^{2+}$ as activator ions, but the $Fe^{2+}$ also acts as an important quencher ion when Fe concentration in dolomite is over 10,000 ppm. The dolomites, which are rich in calcium, are formed at the early stage of diagenesis at a temperature of about 60 ～ $70^{\circ}C$.

• Economic and Environmental Geology
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• v.12 no.2
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• pp.79-93
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• 1979

Twenty five samples of the scheelite-powellite series from twelve Korean tungsten deposits of various geologic settings were studied mineralogically and geochemically. Variations in the trace-element contents of the scheelite minerals are considered in relation to geologic settings and mineralogic properties. Scheelites from ore deposits developed in similar geologic settings and under similar physicochemical conditions are characterized by specific combinations of trace elements.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.4
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• pp.364-372
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• 2023

By applying coarse-grained limestone and unprocessed coal ash as sintering raw materials for cement clinker, the microstructure and distribution of chemical components of cement clinker were compared and examined. Samples using coarse limestone as a raw material for cement clinker showed a decrease in sinterability compared to samples using reagent-grade raw materials. Samples using coal ash showed a tendency for some increase in sinterability. In samples using coarse limestone and coal ash, the formation of Belite was high at 1350 ℃. The conversion rate from Belite to Alite was high in the range of 1350~1450 ℃. Samples using coal ash showed stable formation of interstitial phase in the range of 1350 to 1450 ℃. The microstructure and chemical composition distribution of cement clinker sintered at 1350~1450 ℃ showed that all samples showed a form and composition distribution in which the calcium silicate phase and interstitial phase were clearly distinguished.

• Journal of the Korean Chemical Society
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• v.55 no.2
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• pp.204-207
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• 2011

A particle counting system that can also provide sensitive, specific chemical information, while consuming very less power, occupying less space, and being inexpensive has been developed. This system uses a microwave plasma torch (MPT) as the excitation source for atomic emission spectrometry (AES). Emission from a single particle can be detected, and the wavelength at which the emission is observed indicates the elements present in the particle. It is believed that correlating the particle size and emission intensity will allow us to estimate the particle size in addition to abovementioned capabilities of the system. In the long term, this system can be made field-portable, so that it can be used in atmospheric aerosol monitoring applications, which require real-time detection and characterization of particles at low concentrations.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2002.05a
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• pp.87-88
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• 2002

• Proceedings of the Korean Society of Tobacco Science Conference
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• 1998.05a
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• pp.23-24
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• 1998

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1998.04a
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• pp.35-37
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• 1998

• The monthly packaging world
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• s.139
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• pp.81-87
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• 2004

• Proceedings of the Korean Environmental Sciences Society Conference
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• 1996.10a
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• pp.26-26
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• 1996

• Food Industry And Nutrition
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• v.8 no.2
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• pp.10-23
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• 2003