• 열처리공학회지
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• 제37권2호
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• pp.66-72
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• 2024

To investigate the effect of deformation condition on microstructure and texture formation behaviors of AZ91 magnesium alloy with three kinds of initial texure during high-temperature deformation, plane strain compression tests were carried out at high-temperature deformation conditions - temperature of 673 K~723 K, strain rate of 5 × 10^-3s^-1, up to a strain of -1.0. To clarify the texture formation behavior and crystal orientaion distribution, X-ray diffraction and EBSD measurement were conducted on mid-plane section of the specimens after electroltytic polishing. As a result of this study, it is found that the main component and the accumulation of pole density vary depending on initial texture and deformation caondition, and the formation and development basal texture components ({0001} <$10\bar{1}0$>) were observed regardless of the initial texure in all case of specimens.

• 열처리공학회지
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• 제33권6호
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• pp.296-302
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• 2020

Magnesium alloys have been rapidly attracting as lightweight structural material in various industry fields because of having high specific strength and low density. It is well known that the crystallographic texture plays an important role in improvement of poor room temperature ductility of magnesium alloys. In this study, high-temperature plane strain compression deformation was conducted on extruded AZ80 magnesium alloy at 723K by varying the strain rates ranging from 5.0×10^-3s^-1 to 5.0×10^-2s^-1 in order to investigate the behaviors of texture formation. It was found that texture formation behaviors in three kinds of specimens were affected by continuous and discontiuous deformation mechanism.

• 복식
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• 제41권
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• pp.117-138
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• 1998

This study can be divied into three major sections: 1. Background on the 1980s : The 1980s can be characterized as a era of rising expectations over the quality of life. Interest in art, history, culture, and new technology increased to appeal to a greater audience. In fashion, these changes led to greater focus on quality and unique stylishness as fashion represented a medium through which luxury and refined tastes could be expressed. 2. Textile Trends of the 80s Divided into 4 Periods : The period of 1980-82 saw the mixture of natural lines with constructive lines. The textiles used in fashions in this period can be characterized by natural materials, mannish materials of the 1950s, feminine materials of the 1920s and 30s, and spoty materials of the 1960s. The period of 1983-85 was an avante garde period which used rustic avante-garde materials and art craft materials. The period of 1986-87 can be described as minimalistic and neo-classical which incorporated materials which represents a metropolitan feel, retro decorative materials and sporty, futuristic mat-erials. Lastly, the period of 1988-89 produced ethnic and natural fashions which relied on traditional British materials, country elegant and innocent look fabrics, ethinic and ecology-minded materials, in addition to comfortable and sports casual materials. 3. Characteristrics and methods of expression for textiles in the 1980s, : In the 1980s, the development of textiles have can be divided into 4 distinct patterns: decorative materials, sporty materials. In generals textiles have increased in their decorative nature-especially decoration by texure. Textile have also incorporated the mixture of contrasting themes in order to create new fabrics.

• 한국초전도학회:학술대회논문집
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• 한국초전도학회 2000년도 High Temperature Superconductivity Vol.X
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• pp.56-60
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• 2000

Cube texture를 갖는 Ni기판위에 MOCVD(Metal Chemical Vapor Deposition)를 이용하여 NiO, CeO$_2$, YBCO 박막을 제조하였다. NiO(200)와 CeO$_2$(200) buffer layer는 450${\sim}$470$^{\circ}$C에서 10분간 MOCVD방법으로 (100)<001>Ni 기판위에 직접 증착하였다. 제조된 NiO, CeO$_2$ buffer layer는 조직이 치밀하며 표면의 상태가 매우 좋으며 Ni기판 위에 epitaxial하게 성장하였다. NiO는 Ni기판과 NiO<100>//Ni<100>의 방위관계를 가지고 성장하였으며, CeO$_2$는 증착조건에 따라 CeO$_2$ <100>//Ni<100> 및 CeO$_2$ <110>//Ni<100> 의 방위관계를 가지고 성장하였다. 증착된 NiO막과 CeO$_2$막에서 균열은 발생하지 않았다. MOCVD법으로 표면에 biaxial texture를 갖는 ceramic buffer를 증착시킨 NiO/Ni및 CeO$_2$/Ni 기판위에 YBCO박막을 MOCVD법으로 제조하였다. YBCO막은 기판온도 800$^{\circ}$C,증착압력 10torr, 산소분압을 0.7torr로 하여 10분간 행하였다. 공급원료의 조성에 따라 YBCO의 막의 texture와 형성되는 상이 변화되었다. NiO/Ni및 CeO$_2$/Ni 기판 위에 증착된 YBCO막은 c축 배향성을 가지고 성장하였으며, -scan 및 ${\varphi}$ -scan으로 측정한 (500)면의 in-plane과 (110)면의 out-of-plane의 FWHM(Full Width Half Maximum)값은 각각 10$^{\circ}$ 미만으로 우수하였다.

• 한국잡초학회지
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• 제14권2호
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• pp.101-106
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• 1994

수경재배(水耕栽培)와 폿트실험을 통하여 벼에서 이앙심도(移秧深度), 묘령(苗齡) 및 토성(土性)에 따른 Dithiopyr의 약해정도(藥害程度)를 검정(檢定)하였으며 벼에서 상기(上記) 요인(要因)에 따른 벼의 $^{14}C$-dithiopyr 흡수량(吸收量)을 측정(測定)하여 벼의 Dithiopyr 약해발생(藥害發生) 기구(機構)를 구명(究明)하였다. 1. 벼는 이앙심도(移秧深度)가 얕고 엽령(葉齡)이 어릴수록, 그리고 양토(壤土)나 사양토(砂壤土)에 비하여 사질토양(砂質壤土)에서 약해정도(藥害程度)가 더 심한 경향(傾向)이었다. 2. Dithiopyr의 흡수량(吸收量)은 벼의 이앙심도(移秧深度) 2, 3cm, 보다 0cm에서 그리고 엽령(葉齡) 2엽기(葉基)보다 3, 4엽기(葉基)에서 더 많았다. 그리고 사질양토(砂質壤土)은 사양토(砂壤土)나 양토(壤土)에 비하여 흡수량(吸收量)이 많은 경향(傾向)이었다. 3. 따라서 사질양토(砂質壤土)과 이앙심도(移秧深度)가 얕거나 뜬묘(苗)가 생긴 경우(0cm)에는 벼의 Dithiopyr 흡수량(吸收量)이 많기 때문에 벼의 약해발생(藥害發生)이 높은 것으로 사료(思料)되었다.