• Title/Summary/Keyword: I-섬유

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Flexural and Workable Properties of High Performance Hybrid Fiber Reinforced Concrete (고성능 하이브리드 섬유 보강 콘크리트의 휨 및 유동 특성)

  • Park Choon-Keun;Noh Myung-Hyun;Park Tae-Hyo
    • Journal of the Korea Concrete Institute
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    • v.17 no.4 s.88
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    • pp.543-550
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    • 2005

  • In the present work, modulus of rupture (MOR), flexural toughness properties $(I_{30}\;and\;W_{2.0})$ and workability (slump) of high performance hybrid fiber reinforced concrete (HPHFRC) mixed with micro-fiber (carbon fiber) and macro-fiber (steel fiber), and replaced with a fine mineral admixture such as silica fume (SF) are characterized through the analysis of variance (ANOVA). Data of MOR, $I_{30}(or W_{2.0})$ and slump are used as the characteristic values to estimate flexural performance and workable property of HPHFRC. Specially, an experimental design was Planned according to the fractional orthogoanl nay method to reduce experimental number of times. The experimental results show that steel fiber is a considerable significant factor in MOR and I30 $(W_{2.0})$. Based on the significance of experimental factors about each characteristic factors, the following evaluation can be used: Experiment factors which reduce slump most remarkably are carbon fiber, steel fiber, silica fume order.; Those that improve MOR most significantly are silica fume $({\fallingdotseq}\;carbon\;fiber)$, steel fiber order; Those that increase flexural toughness most distinctly are silica fume, carbon fiber, steel fiber order. It is obtained that the combination of steel fiber $1.0\%$, carbon fiber $0.25\%$ and silica fume $5.0\%$ is the experimental condition that improve MOR and flexural toughness excellently with workability ensured within the experiment.

  • https://doi.org/10.4334/JKCI.2005.17.4.543 인용 PDF KSCI

Synthesis and Properties of PET-PCT Copolyester I - Thermal Property and Degradation Behavior - (PET-PCT 공중합체의 합성과 물성 I - 열적성질과 분해거동 -)

  • 이원옥;김해영;백두현
    • Proceedings of the Korean Fiber Society Conference
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    • 2001.10a
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    • pp.351-354
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    • 2001

  • Poly(ethylene terephthalate) (PET)는 물리적, 기계적 성질이 우수한 엔지니어링 플라스틱의 하나로 섬유, 필름, 및 여러 가지 용도로 다양하게 사용되고 있다. PET는 DMT(dimethyl terephthalate) 또는 TPA(terephthalic acid)와 EG(ethylene glycol)를 축합 중합하여 제조한다. (중략)

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Anti-Fibrotic Effects by Moringa Root Extract in Rat Kidney Fibroblast (모링가 뿌리 추출물에 대한 신장섬유화 억제 효과)

  • Park, Su-Hyun;Chang, Young-Chae
    • Journal of Life Science
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    • v.22 no.10
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    • pp.1371-1377
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    • 2012

  • Fibrosis in kidney by internal and external factors causes progressive loss of renal function. Renal fibrosis is the inevitable consequence of an excessive accumulation of the extracellular matrix. TGF-${\beta}$ plays an important role in the process of renal fibrosis and stimulates the synthesis of profibrotic factors, including collagens, fibronectin, and plasminogen activator inhibitor (PAI-1). We examined the effect of Moringa oleifera Lam (moringa) extracts in a rat kidney fibrosis model. We found that moringa root extract suppresses protein expression/mRNA levels of Type I collagen, fibronectin, and PAI-1 induced by TGF-${\beta}$ in renal fibroblasts. Moringa root extract selectively inhibited phosphorylation of TGF-${\beta}$-induced $T{\beta}RII$ and the downstream signaling pathway (e.g., Smad4), and phospho-ERK, but not JNK, p38, or PI3K/AKT. These results suggest that moringa root extract can act against TGF-${\beta}$-induced renal fibrosis in rat kidney fibroblast cells by a mechanism related to its antifibrotic activity, which regulates expression of fibronectin, Type I collagen, and PAI-1 through $T{\beta}RII$-Smad2/3-Smad4 and ERK. Therefore, moringa root extract is an effective substance for fibrosis therapy and provides a new therapeutic strategy for diseases associated with elevated profibrotic factor synthesis.

  • https://doi.org/10.5352/JLS.2012.22.10.1371 인용 PDF KSCI

Studies on the Sorption and Permeating of Acid dyes through silk fibroin Membrane(I) (견 피브로인 막을 통한 산성염료의 흡착과 투과에 관한 연구(I))

  • 배도규;탁태문
    • Journal of Sericultural and Entomological Science
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    • v.30 no.2
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    • pp.105-111
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    • 1988

  • 견 피브로인과 그 응용에 관한 기초적인 자료를 얻기 위하여, 본 연구에서는, 견섬유와 피브로인막의 구조에 대해서 IR, DSC, X-ray diffraction, SEM, 아미노산분석 등의 조사를 통하여 구조변화를 비교하였다. IR과 DSC를 통하여 얻은 결과, 피브로인 막의 구조는 대부분 random coil과 Silk I type으로 구성되어 있지만, Silk II type의 존재도 인정되었다. 피브로인 막을 전자현미경으로 관찰한 결과, 표면은 구상체로 치밀하게 형성되어 있었고, 단면구조는 거의 대칭적인 것임을 알았다. 견섬유와 피브로인 막의 아미노산 분석결과, 전체에 대한 염기성 아미노산의 함량은 피브로인 막보다 견섬유가 더 많은 것을 알 수 있다.

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