• Title/Summary/Keyword: fiber content

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The Effect of Extrusion Conditions on Water-extractable Arabinoxylans from Corn Fiber

  • Jeon, Su-Jung;Singkhornart, Sasathorn;Ryu, Gi-Hyung
    • Preventive Nutrition and Food Science
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    • v.19 no.2
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    • pp.124-127
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    • 2014
  • The effect of feed moisture contents (30%, 40%, and 50%) and screw speed (200 rpm, 250 rpm, and 300 rpm) on the corn fiber gum (CFG) yield and soluble arabinoxylans (SAX) content of destarched corn fiber was investigated. The CFG yields and SAX contents of extruded, destarched corn fiber were higher than that of destarched corn fiber. In extruded, destarched corn fiber, increased screw speed and decreased feed moisture contents resulted in a higher SAX contents. The maximum yields of CFG obtained from extruded, destarched corn fiber were $79.1{\pm}19.0g/kg$ (30% feed moisture content) and $82.3{\pm}11.30g/kg$ (300 rpm screw speed). The highest SAX content was also observed at a screw speed of 300 rpm. The results of the present study show that water extraction and extrusion combined have the potential to increase CFG and SAX yields from corn fiber.

Physical and Mechanical Properties of Eco-concrete with Polypropylene Fiber (폴리프로필렌 섬유를 혼입한 에코콘크리트의 물리.역학적 특성)

  • 성찬용;리신호;송창섭
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.43 no.1
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    • pp.116-121
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    • 2001
  • This study is performed to examine the physical and mechanical properties of eco-concrete with polypropylene fiber. Test results show that the strengths are increased with increase of the content of natural gravel, excellent soil compound and polypropylene fiber. The coefficient of permeability is increased with increase of the content of the polypropylene fiber but it is decreased with increase of the content of natural gravel and excellent soil compound. The lowest coefficient of permeability is achieved by eco-concrete which it is 100 times lower than that of the control. The durability factor is increased with increase of the content of natural gravel and excellent soil compound, and decreased with increase of the content of polypropylene fiber.

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Freezing and Thawing Properties of Polypropylene Fiber Reinforced Eco-concrete (폴리프로필렌 섬유보강 에코콘크리트의 동결융해 특성)

  • Sung Chan-Yong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.48 no.2
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    • pp.59-66
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    • 2006
  • This study is performed to evaluate freezing and thawing properties of polypropylene fiber reinforced eco-concrete using soil, natural coarse aggregate, soil compound and polypropylene fiber. The mass loss ratio is decreased with increasing the content of natural coarse aggregate and soil compound, but it is increased with increasing the content of polypropylene fiber. The ultrasonic pulse velocity, dynamic modulus of elasticity and durability factor are increased with increasing the content of natural coarse aggregate and soil compound, but it is decreased with increasing the content of polypropylene fiber. The mass loss ratio, ultrasonic pulse velocity, dynamic modulus of elasticity and durability factor are $1.49{\sim}3.32%,\;1,870{\sim}2,465\;m/s,\;77X10^2{\sim}225X10^2\;MPa\;and\;84.6{\sim}92.8$ after freezing and thawing 300 cycles, respectively. These eco-concrete can be used for environment-friendly side walk and farm road.

Overview of muscle metabolism, muscle fiber characteristics, and meat quality

  • Choe, Jeehwan
    • Korean Journal of Agricultural Science
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    • v.45 no.1
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    • pp.50-57
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    • 2018
  • Meat comes from the skeletal muscles of farm animals, such as pigs, chickens, and cows. Skeletal muscles are composed of many muscle fibers. Muscle fibers are categorized into three types, fiber type I, IIA, and IIB, based on their contractile speed and metabolic properties. Different muscle fiber types have different biochemical, physiological, and biophysical characteristics. Especially, the characteristics of muscle fiber type I and IIB are opposite to each other. Muscle fiber type I has a relatively strong oxidative metabolic trait and a higher content of lipids. In contrast to fiber type I, muscle fiber type IIB has a strong glycolytic metabolic trait and a relatively lower content of lipids and a higher content of glycogen. Muscle fiber type IIA has intermediate properties between fiber type I and IIB. Thus, muscles with different fiber type compositions exhibit different ante- and post-mortem muscle characteristics. In particular, the different metabolic traits of muscles due to the different compositions of the fiber types strongly affect the biochemical and physiological processes during the conversion of muscle to meat and subsequently influence the quality of the meat. Therefore, understating muscle metabolism and muscle fiber characteristics is very important when discussing the traits of meat quality. This review is an overview on basic muscle metabolism, muscle fiber characteristics, and their influence on meat quality and finally provides a comprehensive understanding about the fundamental traits of muscles and meat quality.

Fiber Orientation of Short Fiber Reinforced Polymeric Composites Depending on Injection Mold Shape Variations (단섬유강화 고분자 복합재료에서 사출성형 형상금형 형상변화에 따른 섬유배향상태)

  • Kim, Hyuk;Han, Gil-Young;Lee, Dong-Gi
    • Proceedings of the KSME Conference
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    • 2001.11a
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    • pp.778-784
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    • 2001
  • Injection molding is a very important industrial process for the manufacturing of plastics objects. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of weld-line parts in injection-molded products is assessed. And the effects of fiber content and injection molding conditions on the fiber orientation functions are also discussed.

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Measurement of the Fiber Orientation on Weld-Line Parts for Injection Molding of Fiber Reinforced Polymeric Composites (섬유강화 고분자 복합재의 사출성형에 있어서 웰드라인부의 섬유배향측정)

  • Kim, H.;Kang, M.G.;Choi, Y.S.;Lee, D.G.;Han, G.Y.;Kim, E.G.
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2000.11a
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    • pp.265-270
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    • 2000
  • Injection molding is a very important industrial process for the manufacturing of plastics objects. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation· orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of weld-line parts in injection-molded products is assessed. And the effects of fiber content and injection molding conditions on the fiber orientation functions are also discussed

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A Study on Fiber Orientation of Compression-Molded Rib type Products (압축성형된 리브형 성형품의 섬유배향에 관한 연구)

  • Jo S. H.;Oh Y. J.;Lee K. S.;Yoon S. U.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2001.10a
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    • pp.313-318
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    • 2001
  • Compression molding is widely used process for the industrial forming of fiber reinforced plastic articles. Its applications are of an extreme variety and the products range from large parts, such as used in the automotive industry to much smaller objects. In this paper, distribution of fiber orientation by the image processing method for rib type compression molded products of each fiber content is measured. And the effects of fiber content, product size on the orientation state are discussed.

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Characteristics of Fracture Energy on Steel Fiber-Reinforced Lightweight Polymer Concrete

  • Youn, Joon-No;Sung, Chan-Yong
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.45 no.7
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    • pp.11-19
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    • 2003
  • In this study, unsaturated polyester resin, artificial lightweight coarse aggregate, artificial lightweight fine aggregate, heavy calcium carbonate and steel fiber were used to produce a steel fiber-reinforced lightweight polymer concrete with which mechanical properties were examined. Results of this experimental study showed that the flexural strength of unnotched steel fiber-reinforced lightweight polymer concrete increased from 8.61 to 13.96 MPa when mixing ratio of fiber content increased from 0 to 1.5%. Stress intensity factors($K_{IC}$) increased with increasing fiber content ratio while it did not increase with increasing notch ratio. Energy release rate ($G_{IC}$) turned out to depend upon the notch size, and it increased with increasing steel fiber content.

A Study on Stabilization and Mechanical Properties of Polyacrylonitrile-based Fiber with Itaconic acid (이타콘산을 함유한 폴리아크릴로니트릴계 전구체섬유의 열안정화 및 그 물성에 관한 연구)

  • 신익기;이신희;박수민
    • Textile Coloration and Finishing
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    • v.15 no.2
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    • pp.76-85
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    • 2003
  • In this study, a continuous stabilization process is used to make high-performance carbon fiber from polyacrylonitrile(PAM)-based fibers. The effect of oxygen content of PAN-based fiber on the stabilization process and the properties of the resultant carbon fibers is investigated. In order to research the progress of stabilization reaction FT-IR, elemental analysis, density, DSC, etc are used. Stabilization is carried out in air atmosphere from the 200 to $300^\circ{C}$ temperature range. An increase of PAN-based fibers diameter reduces the oxygen content during the continuous stabilization process. A higher oxygen content increase the density, tensile strength and modulus in the resultant carbon fibers. The most appropriate oxygen content in the stabilized fiber should be about 12%. Fibers having more than 2% oxygen content yield carbon fibers with inferior properties. Those carbon fibers also have sufficient commercial availability.

Flexural Performance of Cement Treated Clay-Sand Mixtures Reinforced with Synthetic Fibers (합성섬유로 보강된 시멘트-점토-모래 혼합토의 휨성능 평가에 관한 연구)

  • Jung, Du-Hwoe;Cho, Baik-Soon;Lee, Yong-Yun
    • Journal of the Korean Geosynthetics Society
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    • v.16 no.1
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    • pp.19-29
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    • 2017
  • The effects of synthetic fibers, cement content, and sand content on the flexural performance of cement-clay-sand mixtures has been evaluated through a flexural performance test with a third-point loading. Beam specimens for the flexural performance test were fabricated with a various amount of cement, sand, and synthetic fibers. Two types of fibers, PVA (Polyvinyl alcohol) and PP (Polypropylene) fibers, were employed in the test. The test results have exhibited that the factors considered in the test have significant effects on the flexural performance of the mixtures in several aspects. The flexural performance of the mixtures has been improved if the mixtures were reinforced with synthetic fibers. The flexural strength and the flexural toughness of the mixtures has been increased as the fiber content was increased. A multiple linear regression analysis has been performed to evaluate the effect of fiber content, cement dosage, and sand content on the flexural performance of the mixtures in terms of flexural strength and flexural toughness. Cement content and sand content were estimated as important factors to have an influence on the first-crack strength and the peak strength whereas the fiber content has the most significant influence on the post-crack behavior. The first-crack strength and the ultimate strength were increased as the cement content and the sand content were increased. As the fiber content was increased, the flexural toughness was increased.