• Title/Summary/Keyword: DSC

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Electrochemical Impedance Spectroscopy Analysis on the Dye-sensitized Solar Cell with Different $TiO_2$ thicknesses ($TiO_2$ 두께에 따른 염료감응형 태양전지의 전기화학적 임피던스 분석)

  • Kim, Hee-Je;Lee, Jeong-Gee;Seo, Hyun-Woong;Son, Min-Kyu;Kim, Jin-Kyoung;Prabalkar, K.;Shin, In-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.12
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    • pp.2425-2430
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    • 2009
  • Dye-sensitized solar cell(DSC) is composed of a dye-adsorbed nanoporous $TiO_2$ layer on fluorine-doped tin oxide(FTO) glass substrate, electrolyte, and platinium doped counter electrode. Among these, a dye-absorbed nanoporous $TiO_2$ layer plays an important role in the performance of the DSC because the injected electrons from excited dye molecules move through this layer. And the condition of $TiO_2$ layer such as the morphology and thickness affects on the electron movement. Therefore, the performances and the efficiency of DSC change as the thickness of $TiO_2$ layer is different. Electrochemical Impedance Spectroscopy(EIS) is the powerful analysis method to study the kinetics of electrochemical and photoelectrochemical processes occurring in the DSC especially the injected electron movements. So we analyzed the DSCs with different $TiO_2$ thicknesses by using EIS to understand the influence of the $TiO_2$ thickness to the performance of the DSC clearly. Finally, we got the EIS analysis on the DSC with different $TiO_2$ thickness from the internal resistance of the DSC, the electron life time and the amount of dye molecules.

Study on the Long-term Thermal Stability by DSC & ARC and its ISCO behaviors with different AP Quality (DSC, ARC, ISCO를 활용한 다양한 순도를 가진 AP의 장기 열적안정성 연구)

  • Kim, Seunghee;Kwon, Kuktae;Lee, So Jung
    • Journal of the Korean Society of Propulsion Engineers
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    • v.22 no.2
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    • pp.59-65
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    • 2018
  • We conducted an isothermal slow cook-off(ISCO) test for an aluminized explosive containing AP. The sample bulged before the run-away reaction, and therefore we were unable to obtain the ISCO data. However, these phenomena did not occur for a certain AP grade, which means that the quality of the AP exerted a significant effect on the thermal stability of the explosive formulation. In this study, we investigated the thermal stability difference between a good and bad AP grade. First, we characterized the thermal properties of all APs by Differential Scanning Calorimeter(DSC) and correlated them to the ISCO phenomena. In addition to the DSC study and ISCO test, we also investigated and calculated the SADT and self-heating rate by the ARC of the different AP qualities to interpret the thermal stability of the explosive formulation. Moreover, we investigated the impurity of the AP and a preparation method to remove the included impurity and crystallization. Finally, we implemented qualification methods to identify the quality of AP by DSC using a high-pressure crucible.

Analysis Thermal Performance of PV/Thermal Collector with Dye-sensitized Solar Cell Module (염료감응형태양전지 모듈 적용 PVT 집열기의 열적 성능 분석)

  • Jang, Han-Bin;Mun, Jong-Hyeok;Gang, Jun-Gu;Kim, Jin-Hui;Kim, Jun-Tae
    • Proceedings of the Korean Society for Emotion and Sensibility Conference
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    • pp.273-276
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    • 2009
  • Photovoltaic-thermal(PVT) collectors are a combination of photovoltaic modules with solar thermal collectors, forming one device that receives solar radiation and produces electricity and heat simultaneously. Of various PV modules, dye-sensitized solar cell(DSC) is a relatively new type of solar cell technology that can transmit light while they can generate electricity. With this aspect, DSC can be applied into solar thermal collectors. The object of this study is to evaluate the thermal performance of PVT collector with DSC. The thermal performance of the DSC PVT combind collector was measured in outdoor conditions with the solar radiation of over $700W/m^2$. In this study, the PVT collector with the 30% light transmittance of DSC achieved its thermal efficiency of about 36%.

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Application of Derivative State Constrained Optimal $H_2$ Controller for Disk Drive Read System

  • N., Puttamaoubon;A., Numsomran;T., Trisuwannawat;K., Tirasesth;M., Iida
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1410-1413
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    • 2003
  • This paper presents the design technique for controlling the oscillation in the Disk Drive Read System via Derivative State Constrained (DSC)-Optimal $H_2$ Controller. The Optimal $H_2$, DSC-Optimal $H_2$ and Incorporating of Stability Degree Specification DSC Optimal $H_2$ are discussed. The results among these schemes are compared to verify the merit of DSC that effectively suppresses the oscillation in oscillatory system. The suggestions of how to select the weights of optimal controls are given.

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The Study of Single Phase Source Stability consider for The DSC Cell's Operation Character by controlled Peed-back Circuit (DSC동작 특성에 따른 피드백제어를 통한 단상 전원의 안정화에 관한 연구)

  • Kim, Jin-Young;Park, Sung-June;Jung, Jong-Jin;Yoo, Dong-Wook;Kim, Hee-Je
    • 한국신재생에너지학회:학술대회논문집
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    • pp.677-679
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    • 2005
  • 최근 나노입자를 이용하는 광전 화학전지(PEC, Photoelectrochemical)인 염료감응형 태양전지(DSC)의 효율이 증가함에 따라 DSC 태양광 발전 시스템의 성능 개선 또한 요구되어진다. 본 연구에서는 Fly-Back DC-DC 컨버터(변화비율1:10)를 이용하여 DSC셀의 전압을 DC 300V로 승압시켰다. 또한 풀브릿지 인버터를 사용하여 AC 220V, 60Hz의 출력전압을 얻었다. 연구에서 제안한 회로는 높은 효율의 동작특성과 간단한 제작, 낮은 제조비용, 그리고 안정성을 추구한다. 또 다른 주요점은 부하단에서 Feed back을 받아 동작을 컨트롤하는 것이다. 부하단의 출력 전압과 전류를 Feed back 받아서 DSP320LF2406을 A/D기능을 사용하여 실시간으로 부하의 변화에 대처하여 컨버터와 인버터의 동작을 제어한다.

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Fabrication of dye sensitized solar cell by multiple growth of ZnO particle (ZnO 입자 다중 성장을 이용한 염료 감응형 태양 전지 제작)

  • Choi, Jin-Ho;Son, Min-Kyu;Kim, Jin-Kyoung;Choi, Seok-Won;Prabakar, K.;Kim, Hee-Je
    • Proceedings of the KIEE Conference
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    • pp.1469-1470
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    • 2011
  • 본 연구에서는 ZnO 입자 다중 성장을 이용하여 DSC를 제작하여 ZnO DSC의 가능성을 점검하고자 하였다. ZnO 입자 성장은 zinc acetate solution을 이용하여 seed layer를 제작한 후 zinc nitrate와 NaOH 혼합 용액에 다중성장 시킴으로써 완성되며 이를 이용하여 ZnO DSC를 제작하였다. 그 결과 ZnO가 입자형태로 얻어짐을 확인하고 ZnO DSC를 성공적으로 제작할 수 있었으며 ZnO 입자 성장 후 소성을 통해 ZnO DSC의 성능을 0.406%에서 1.385%까지 개선시킬 수 있었다.

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Crystallization Kinetics of $PbO-TiO_2-SiO_2-B_2O_3$ Glasses by DSC (DSC에 의한 $PbO-TiO_2-SiO_2-B_2O_3$계 유리의 결정화 속도)

  • 손명모;이승호;이헌수;박희찬
    • Journal of the Korean Ceramic Society
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    • v.32 no.12
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    • pp.1331-1336
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    • 1995
  • The glass-ceramics for ferro-electric were made from compositions of 70PbO.16TiO2.8SiO2.4B2O3.2AlPO4 (wt%) and 67.5PbO.20TiO2.8.5SiO2.2B2O3.2AlPO4 (wt%). The crystallization kinetics for PbTiO3 crystalline phase formation from glass was studied using non-isothermal DSC techniques. The values of activation energy, ΔE using variables of heating rate and temperature were calculated at various reaction fractions obtained from peak area over DSC. The results indicated that activation energy was lowest at 60% reaction fractions and the activation energy of glass containing 20.0 wt% TiO2 is higher than that of glass containing 16.0 wt% TiO2. The crystallization mechanism was three dimensional growth (n=4).

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A Correlation Analysis between DSC (Dye Sensitized Cell) and Daylighting-Focusing on Educational Space (염료감응형 태양전지(DSC)와 자연채광의 상관관계 분석-교육공간을 중심으로)

  • Lee, Eung-Jik
    • Journal of the Korean Solar Energy Society
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    • v.40 no.1
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    • pp.35-47
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    • 2020
  • Due to the large window area, the lighting environment of the educational space between the window and deep part of the room is not uniformly illuminated, and the phenomenon of glare is severe. For this reason, the daylight performance of DSC-BIPV windows was analyzed in order to improve the natural lighting in the educational sector. The method derives the correlation with natural lighting by measurement and simulation. Dynamic simulation confirmed that the average illuminance of the target space was higher at later than the early afternoon. The performance of natural lighting at 40% and 30% transmission of DSC has the effect of significantly reducing the amount of excess light in existing windows. Nevertheless, the actual average illuminance in all seasons corresponds to the standard illuminance of the educational facility, 300 Lux. In addition, the uniformity is also seen through the skylight illuminance ratio.

A Study on the Influence Factors for Liquefaction Based on the Disturbed State Concept (DSC 이론을 기초로 한 액상화 영향인자들에 관한 연구)

  • 박인준
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.361-368
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    • 1998
  • The purpose of this study is to find out the factors affacting liquefaction potential by using DSC(disturded state concept) method and to verify these results through cyclic shear test (truly triaxial test and cyclic triaxial) on saturated sandy soil. Based on this reserch, the DSC method predictions were found to provide satisfactory correlation with the cyclic shear test. And the relationship between the factors affecting liquefaction characteristics--relative density(Dr0 and initial effective confining pressure and physical properties of the saturated sand --ξD and Dc--is found. If the relative density and the initial effective confining pressure increase, the number of cyclic grows up. This means that Dc is incresed and ξD is decreased. Therefore, the liquefaction potential can be evaluated and the factors affacting liquefaction potential can be investigated by using on DSC method. Finally, it is shown that the DSC method can capture the liquefaction mechanism.

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A Study on the Thermal Decomposition Characteristics of Intermediate of Saccharin (삭카린 중간체의 열분해 특성에 관한 연구)

  • 김관응;김영수;신창섭
    • Journal of the Korean Society of Safety
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    • v.13 no.4
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    • pp.180-185
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    • 1998
  • The evaluation of thermal and pressure hazard of chemicals on the manufacturing, transporting and storaging is important in the chemical industry for safety. In this study, the thermal decomposition characteristics of intermediate of Saccharin were investigated by using Accelerating Rate Calorimeter(ARC) and Differential Scanning Calorimeter(DSC). Experimental results showed that decomposition temperatures in p-TSA were about 280~$318^{\circ}C$ by DSC and $201^{\circ}C$ by ARC. In case of o-TSA were about $336^{\circ}C$~$360.8^{\circ}C$ by DSC and $299^{\circ}C$ by ARC. The decomposition temperature acquired by ARC was about $70^{\circ}C$ lower than that by DSC. The exothermic runaway reaction in case of p-TSA occured in 598 minute and o-TSA in 5 minute. For the safety in the chemical industry, we should consider the ARC data as well as DSC data in the handling and design of process.

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