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X-선 회절 분석을 통한 고온 피해 시멘트 경화체의 성분 변화 분석
지우람 ( Ji Woo-ram ),박지웅 ( Park Ji-woong ),신기돈 ( Shin Ki-don ),이건철 ( Lee Gun-cheol ),허영선 ( Heo Young-sun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2
In this study, the change of composition of cement hardened at high temperature through XRD was observed. The specimen was made of cement paste and the heating rate condition was applied at rapid thermal annealing (10.0℃ / min). The decrease of calcium hydroxide was not confirmed, but the calcium carbonate tended to be impossible or decreased after 800℃. Calcium silicate and larnite were observed to increase with increasing temperature. It is considered that silicic acid, which is a stable structure due to the decomposition of calcium silicate, is changed into a phase such as lime.
김호영,김현규 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10
In this paper, welding residual stresses in an arc welded lap joint are evaluated by finite element (FE) analysis of a continuum model considering transformation induced plasticity (TRIP). The constitutive model for the plastic behavior including TRIP is implemented in user material subroutine (UMAT) of Abaqus/Standard. Numerical results are compared with experimentally measured residual stresses by X-ray diffraction technique. Moreover, the welding residual stresses in a continuum FE model are mapped to a simplified FE model using shell elements by moving least square approximation. The methodologies and results in this study show that the welding residual stresses in a local-level FE model of a welded joint can be mapped successfully to a simplified FE model.
Kashif I.,Ratep A. 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.3
Glass samples with the composition 40 Bi 2O3-60 GeO 2-x Er 2O3 are prepared using the melt quenching procedure. Fourier- transform infrared spectroscopy (FTIR), differential thermal analysis (DTA), Ultraviolet/Visible/Near-infrared (UV/Vis–NIR) absorption, photoluminescence spectroscopy (PL), and X-ray diffraction (XRD) are used to characterize the glass and glass– ceramic materials. The glass transition and crystallization temperatures are determined. Crystallization kinetics was studied in non-isothermal conditions. The oscillator strengths and Judd–Ofelt parameters (Ω 2 , Ω 4 , Ω 6 ) for reported Er 3+ absorption transitions are estimated, and they follow the trend Ω 2 > Ω 6 > Ω 4 for observed Er 3+ absorption transitions. The iconicity of glass samples was unaff ected by an increase in Er 3+ ions. XRD and FTIR confirmed the formation of the Bi 4Ge3O12 phase after heat treatment of glass samples at the crystallization temperature. The CIE chromaticity diagram computes the CIE chromatic coordinates. The values for all glass and crystal samples are close to bright blue and green. Glass and glass ceramic samples are suitable for green and blue optoelectronics device applications.
高麗時代 기와의 科學的 分析 : 중부지역 寺址를 중심으로 Focus on the temple site at the central districts
서정호,김경범 공주대학교 문화재보존과학연구소 2004 문화재과학기술 Vol.3 No.1
중부지역의 대표적인 고려시대 寺址인 河南 天王寺址, 瑞山 普願寺址, 保寧 聖住寺址, 忠州 崇善寺址, 中原 淨土寺址 5군데를 대상으로 연구하였다. 이 5군데 寺址는 발굴되어 있거나 유적지의 형상이 잘 남아 있어서 본래 모습으로의 복원 가능성이 높은 것으로 추정되는 곳이다. 기와의 문양과 태토의 내적인 속성분석을 통한 지역적인 특성이나 시기적인 차이점 등을 연구하기 위하여 수습한 기와의 고고·미술사적인 의미를 알아보았다. 또한 기와의 제작기법 및 복원에 대하여 논하기 위해 회백색·회청색·적갈색의 세 가지 색깔(색조)별 기와의 내부 조직의 특성과 문양별로 구분하였다. 그리고 과학적 성분 분석인 현미경 관찰과 XRD 분석을 통한 성분을 분석하여 사찰 복원시에 기와에 대한 기초적인 자료를 제공하였다. Five Koryo's temple sites are Hanam cheonwangsaji in Kyoung-gi Provice, Seosan Bowonsaji and Boryoung Seongsaji in Chungnam Province, Chungju Seungjunsaji and Jungwon Jeongtosaji in Chungbuk Province at the central districts. The purpose of the study is to investigate the manufacturing technique of Koryo's roofing tiles, and to grope for restoring, and to suggest basic data to coming age for restoring and repairing roofing tiles in each temple sight. As studying method, I classified collecting roofing files according to the color-light gray, grayish blue, and reddish brown-and structure, and pattern. To analyze their chemical components, Microscope observation, XRD analysis, dropping diagram of scatter were done. And these results with present report and field survey are analyzed and compared with each excavated location.
Maiti, Jatindranath,Kakati, Nitul,Woo, Sung Pil,Yoon, Young Soo Elsevier 2018 Composites science and technology Vol.155 No.-
<P><B>Abstract</B></P> <P>A new hybrid composite proton exchange membrane has been synthesized from dihydrogen phosphate functionalized imidazolium ionic liquid (IL-H<SUB>2</SUB>PO<SUB>4</SUB>), graphene oxide, and Nafion 117 solution. The chemical structure and thermal stability of the dihydrogen phosphate functionalized imidazolium ionic liquid (IL-H<SUB>2</SUB>PO<SUB>4</SUB>) have been analyzed by <SUP>1</SUP>H nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and thermogravimetric analysis (TGA). The structural, thermal, and surface properties of synthesized membranes have been confirmed by FTIR spectroscopy, X-ray diffraction, TGA, and scanning electron microscopy. The proton exchange membranes have been characterized by their ionic conductivity and unit cell performance. The incorporation of IL-H<SUB>2</SUB>PO<SUB>4</SUB> and graphene oxide in the Nafion membrane increases its thermal stability. The ionic conductivity of the membranes increases with temperature and amount of IL-H<SUB>2</SUB>PO<SUB>4</SUB>. The highest ionic conductivity of 0.061 Scm<SUP>−1</SUP> has been achieved at 110 °C under anhydrous conditions which is 1.3 times higher than that of commercial Nafion 117. The synthesized membrane, Nafion/IL/GO, shows the best unit cell performance with a power density of 0.02 W cm<SUP>−2</SUP>, which is 13 times higher than that of the commercial Nafion 117 membrane at 110 °C.</P>
Lee, Tae Won,Lee, Dong Woo,Choi, Yeonjeong,Ok, Kang Min,Park, Kwangyong Elsevier 2019 Journal of industrial and engineering chemistry Vol.69 No.-
<P><B>Abstract</B></P> <P>A novel tetrakis(4-(5,5-dimethyl-2-phenyl-1,3-dioxan-2- yl)phenyl)germane (<B>2</B>) was synthesized by the reaction of germanium(IV) tetrachloride with 4-(5,5-dimethyl-2-phenyl-1,3-dioxan-2-yl)phenyllithium. Colorless plate-shaped single crystals obtained from recrystallization in ether were characterized by the single-crystal X-ray diffraction. The organogermanium compound was crystallized in a noncentrosymmetric nonpolar tetragonal space group, <I>I</I>-4, and classified as a porous molecular material owing to the presence of two types of distinct channels as a result of intermolecular hydrogen bonding. Compound <B>2</B> exhibits a differential gas adsorption property. The powder second-harmonic generating (SHG) measurements indicate that compound <B>2</B> shows a SHG efficiency 10 times greater than those of α-SiO<SUB>2</SUB> and type-1 nonphase-matchable.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
이학술,양승룡 한국재난정보학회 2019 한국재난정보학회 논문집 Vol.15 No.4
연구목적: 본 연구의 목적은 화재가 발생한 교량의 지속적인 사용가능 여부를 결정하고 보수·보강에 대 한 근거자료를 제공하기 위해 교량의 화재 손상여부를 정확하게 분석하는 것이다. 연구방법: 구조물에 전달된 화재온도를 추정하기 위하여 콘크리트의 XRD, SEM 및 EDS 분석 등을 실시하였으며, PSCI Beam 및 바닥판 콘크리트 표면으로부터의 깊이별, 구역별로 분석하였다. 연구결과: 화재구간 콘크리 트에 대한 시험결과 G12,11은 깊이 60mm까지 열에 의한 영향이 미친 것으로 확인되었고 수열온도는 최 대 1000°C 이상인 것으로 나타났다. 그리고 G10,9,8 거더는 G12,11에 비해 상대적으로 약한 피해를 입었으 며 피해 정도는 최대 40mm 깊이까지 열에 의한 영향을 받은 것으로 확인되었다. 결론: 분석된 자료를 근거로 보수‧보강과 정기적인 점검을 시행한다면 본 교량은 화재에 의한 손상을 감안하더라도 충분한 안전성을 확보할 수 있을 것으로 사료된다. Purpose: The purpose of this study is to accurately analyze the damage of bridges in order to determine whether fire bridges can be used continuously or to provide information on maintenance augmentation data. Method: XRD, SEM and EDS analyzes of concrete were carried out to estimate the fire temperature transferred to the structure, and analyzed by depth and area from PSCI beam and bottom plate concrete surface. Results: Test results G12,11 for the fire zone concrete were confirmed to be affected by heat up to depth of 60mm and the temperature of the hydrothermal heat was above 1000 °C. Also, the girder G10,9,8 was relatively weakly damaged compared to G12,11, and the degree of damage was confirmed to be affected by heat up to a depth of 40 mm. Conclusion: Based on the analyzed data, it is considered that if the repair / reinforcement and periodic inspection are carried out, the bridge can secure sufficient safety even considering the damage caused by the fire.
한준희 ( Han Jun-hui ),이영준 ( Lee Young-jun ),현승용 ( Hyun Seung-yong ),이동주 ( Lee Dong-joo ),한민철 ( Han Min-cheol ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
In this study, in order to find new uses for CBS dust, the chemical components of CBS dust were analyzed and effectively proposed a method. Chemical analysis shows that CBS dust contains a large amount of alkali in addition to chloride therefore, if CBS dust is used for secondary concrete products that use high amounts of mixed materials without rebars, it will be found that it can be used effectively for enhancing strength by active alkali.