• Title/Summary/Keyword: CLC

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Reaction between Calcium-doped Lanthanum Chromite and Yttria Stabilized Zirconia (칼슘이 첨가된 란탄-아크롬산 염과 이트리아 안정화 지르코니아 계면간의 반응)

  • Choe, Jin-Sam
    • Korean Journal of Materials Research
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    • v.11 no.6
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    • pp.460-464
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    • 2001
  • The ceramic diffusion coupling with the green body of calcium-doped lanthanum chromite(La$_{0.8}$Ca$_{0.2}$CrO$_3$CLC- G) and sintered calcium-doped lanthanum chromite(La$_{0.8}$Ca$_{0.2}$CrO$_3$ CLC) by Pechini's method on yttria stabilized zirconia(YSZ) plate has been investigated. The X-ray diffraction pattern of CLC sides at the reacted CLC-G/ CLC and CLC/YSZ interface were identified as La$_{1-x}$ Ca$_{x}$CrO$_3$ and the unreacted YSZ side was cubic-ZrO$_2$ at the treated condition, 1300~1500 C for 10 hr in air, respectively. The order of migration components between CLC/YSZ interface was Zr>La>>Cr>>>Ca and these changes were not dependent upon the treated conditions. The grain shape and size at the interface of CLC-G/CLC was appeared to have a uniform distribution with increasing temperature. The bonding reaction of YSZ/CLC was occurred without a large amount change of the compositions in SEM photos.os.otos.os.

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Pitch Variations in Cholesteric Liquid Crystals by Phase Separation (상 분리에 의한 콜레스테릭 액정의 피치 변화)

  • Park Han-Soo;Kim Beom-Kyung;Kim Whan-Ki;Kim In-Sun;Song Ki-Gook
    • Polymer(Korea)
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    • v.30 no.2
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    • pp.182-186
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    • 2006
  • Due to their periodic helical structure, cholesteric liquid crystals (CLC) have a unique ability to selectively reflect light. CLC films reflecting a broad wavelength band were prepared by inducing a pitch gradient in CLC layer through a phase separation. The reflection bandwidth of the CLC cell was broaden as irradiation light intensity decreased and as the amount of the UV absorbing dye increased. Initial reflection bandwidth of 50 nm was broaden to 300 nm Various pitch distributions in the CLC cell was observed using SEM and ATR-IR technique was used to prove that the pitch distributions are induced through the phase separation.

Pitch Variations in Cholesteric Liquid Crystal Film by Molecular Diffusion (분자 확산에 의한 콜레스테릭 액정 필름의 피치 변화)

  • Kwon Young-Jin;Lee Won-Ju;Kim Beom-Kyung;Kim In-Sun;Song Ki-Gook
    • Polymer(Korea)
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    • v.30 no.5
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    • pp.422-425
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    • 2006
  • Due to their periodic helical structure, cholesteric liquid crystals (CLC) have a unique ability to selectively reflect visible light. CLC films reflecting a broad wavelength band were prepared by inducing a pitch gradient in CLC layers through a diffusion of small molecules and through a thermal mixing of cyclic siloxane CLC molecules with different pitch lengths. Various pitch gradients in the CLC cell were observed using UV/Vis spectrometer and SEM technique.

Feature Analysis of Chinese Library Classification(5th Edition) (중국도서관분류법 제5판의 특성 분석)

  • Lee, Changsoo
    • Journal of Korean Library and Information Science Society
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    • v.43 no.3
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    • pp.79-100
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    • 2012
  • The Chinese Library Classification(CLC) is the most widely used national standard classification system in China. Since the first edition of CLC in 1975, the 5th edition of CLC was published in 2010. It was the result of an average of 9 years of revision for each edition. This study investigated CLC focusing on the formational background and developmental process of CLC, and characteristics and revision details of CLC's 5th edition. Because Korea has been close cultural relationship with China for a long time, this study will provide implications on Korean Decimal Classification(KDC) development.

Evaluation of Stability of CLC through Strength and Reduction of Drying Shrinkage (강도 및 건조수축 저감을 통한 CLC의 안정성 평가)

  • Lee, Chang-Woo;Hwang, Woo-Jun;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.11a
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    • pp.205-206
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    • 2022
  • This study intends to conduct tests on subsidence and drying shrinkage by mixing CaO-CSA expansion materials to ensure the stability of CLC, and to understand its properties. Based on CLC of 0.6, the replacement ratio of CaO-CSA expansion material was conducted at five levels compared to blast furnace slag, and the results are as follows. The replacement of CaO-CSA expansion material at an appropriate level produces ethringhite and potassium hydroxide, and it is believed that the internal voids of CLC and the Tobelmorite interlayer structure are charged to increase the structural stability, leading to an increase in compressive strength and a decrease in the drying shrinkage. However, it is judged that tissue relaxation due to excessive substances in the high replacement ratio affects the stability of CLC. In the future, we will conduct additional experiments on density, absorption rate, flow test, and settlement, and evaluate and analyze the stability of CLC by selecting the optimal replacement ratio of CaO-CSA expansion materials.

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Insulation Properties of CLC according to Mixing Ratio of EPS Bead (EPS Bead 혼입비율에 따른 CLC의 단열특성)

  • Lee, Jeong-Taek;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.05a
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    • pp.45-46
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    • 2023
  • CLC is used as a filling material for many buildings, and according to energy saving design standards, CLC also requires insulation performance. However, it shows lower insulation performance compared to organic insulation, so additional research is needed. Therefore, in this study, the insulation properties of CLC were analyzed by incorporating EPS beads with high insulation performance into CLC. In this experiment, EPS beads and blast furnace slag were replaced, and W/B was fixed at 33%. The EPS Bead mixing ratio was divided into 5 levels: 0, 0.5, 1.0, 1.5, 2.0 (%), and the experimental items were measured for apparent density and thermal conductivity. As a result of the experiment, the apparent density and thermal conductivity tended to decrease as the mixing ratio of EPS beads increased. It is judged that the density decreased due to the low density and the micropores inside, and the thermal conductivity also decreased.

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Induction Mechanism of Planar Arrangement in Cholesteric Liquid Crystals (콜레스테릭 액정의 Planar 배열 유도 메카니즘)

  • Jung, Gap-Ha;Lee, Mong-Ryong;Seo, In-Seon;Song, Ki-Gook
    • Polymer(Korea)
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    • v.35 no.3
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    • pp.272-276
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    • 2011
  • The induction mechanisms of planar arrangements in cholesteric liquid crystals (CLC) which showed selective reflections of visible light were investigated by measuring the selective reflectivity and FTIR peak intensity of $C{\equiv}N$ stretching band. Although the planar arrangement of CLC was not as perfectly induced as the cases prepared with using alignment layers, it could be also induced by stretching polymer substrate or by applying shear forces. The planar arrangements were induced by forming CLC helical structures on top of liquid crystal molecules which were in contact with the substrate and oriented all in the same direction.

A Comparative Study on the Classification System of Buddhism in Korea, China and Japan - Focusing on the KDC, CLC, NDC - (한ㆍ중ㆍ일 삼국의 불교분야 분류법 비교연구 - KDC, CLC, NDC를 중심으로 -)

  • 백혜경;남태우
    • Proceedings of the Korean Society for Information Management Conference
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    • 2003.08a
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    • pp.127-138
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    • 2003
  • 본 연구는 한국ㆍ중국ㆍ일본에서 사용되고 있는 표준분류법인 KDC, CLC, NDC의 불교분야를 비교 분석하고, 효과적인 문헌 분류를 위한 KDC 불교분야 개선안을 제시하였다.

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Evolution, Fields of Research, and Future of Chemical-Looping Combustion (CLC) process: A Review

  • Shahrestani, Masoumeh Moheb;Rahimi, Amir
    • Environmental Engineering Research
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    • v.19 no.4
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    • pp.299-308
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    • 2014
  • This study presents a review on Chemical looping combustion (CLC) development, design aspects and modeling. The CLC is in fact an unmixed combustion based on the transfer of oxygen to the fuel by a solid oxygen carrier material avoiding the direct contact between air and fuel. The CLC process is considered as a very promising combustion technology for power plants and chemical industries due to its inherent capability of $CO_2$ capturing, which avoids extra separation costs of the of $CO_2$ from the rest of flue gases. This review covers the issues related to oxygen carrier materials. The modeling works are reviewed and different aspects of modeling are considered, as well. The main drawbacks and future research and prospects are remarked.

Development of Non-flammable exterior design Molding using Cellular Light-weight Concrete (CLC를 활용한 공동주택 불연성능 외벽몰딩 개발)

  • Kwon, Hae-Won;Gong, Min-Ho;Lee, Chang-Yong;Jeong, Gab-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.06a
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    • pp.54-55
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    • 2020
  • Recently, "The rules on the standards of evacuation and fire protection of buildings" require that non-burnable materials such as non-combustible and semi-non-combustible materials be used as the materials applied to the building's exterior walls, but styrofoam, which is a combustible material, has been applied a lot and became a social issue. In this study, we developed a non-combustible outer wall molding to secure construction and economic feasibility and free expression using CLC(CLC: Cellular Light-weight Concrete).

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