• Title/Summary/Keyword: Hybrid Fiber

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유전가열물질을 코팅한 활성탄소섬유의 휘발성 유기화합물 흡착 및 마이크로파 인가에 의한 탈착 연구 (A Study on Adsorption of Volatile Organic Compound by Activated Carbon Fiber Coated with Dielectric Heating Element and Desorption by Applying Microwave)

  • 김상국;장예림
    • 한국대기환경학회지
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    • 제25권2호
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    • pp.122-132
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    • 2009
  • Adsorption of toluene by activated carbon fiber (ACF) coated with dielectric heating element and desorption by applying microwave were investigated. In order to prepare adsorbent so that VOC can be desorbed by microwave heating, fine dielectric heating element with nano size was coated on the surface of the ACF using hybrid binder. Eight adsorbents (ACF-DHE, Activated Carbon Fiber coated with Dielectric Heating Element) were prepared with different amount of dielectric heating element, kinds of hybrid binder, and solvent. In order to investigate adsorption characteristics, BET surface area, pore volume, and average pore size were measured for each adsorbent including ACF. Breakthrough experiments with toluene concentration, flow rate, bed length using fixed bed reactor were performed to investigate adsorbality of adsorbent, and results were compared with that of the ACF. Desorption reactor was constructed with modified microwave oven to investigate heating effect on ACF-DHE by applying microwave power. Each adsorbent saturated with toluene were put into desorption reactor. Composition of desorbed gas generated by applying controlled microwave power to reactor was measured. Up to now, hot air desorption method has been used. Experimental results showed that desorption method with new adsorbent prepared by coating dielectric heating element on ACF can be used for industrial application.

하이브리드 전도성 직조섬유의 전자파 차폐효과 (Electromagnetic Interference Shielding Effectiveness of Hybrid Conductive Fabrics)

  • 한길영;김기열;윤태순
    • 한국기계가공학회지
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    • 제14권2호
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    • pp.81-86
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    • 2015
  • This study investigated electromagnetic interference (EMI) shielding effectiveness (SE) of hybrid conductive fabrics. The coaxial transmission line method was used to measure the EMI Shielding effectiveness of the conductive fabrics. We designed and constructed a measuring system, consisting of a network analyzer and a device that serves as a sample holder and at the same time as a transmission medium of incident electromagnetic waves. The measurements of SE were carried out in a frequency range from 100 MHz to 2 GHz. The results of the EMI shielding experiments showed that the maximum electromagnetic shielding effectiveness (EMSE) values of sandwich type C/A/C (carbon fiber sheet/aluminum foil tape/carbon fiber sheet) and C/Ni/C (carbon fiber sheet/magnetic shielding foil/carbon fiber sheet) samples were 55 dB and 113 dB, respectively, at a frequency of 1.9 GHz.

균열길이와 층간분리 폭의 관계를 이용한 하이브리드 복합재의 층간분리 거동 평가 (Evaluation of Delamination Behavior in Hybrid Composite Using the Crack Length and the Delamination Width)

  • 송삼홍;김철웅
    • 대한기계학회논문집A
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    • 제28권1호
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    • pp.55-62
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    • 2004
  • Although the previous researches evaluated the fatigue behavior of glass fiber/epoxy laminates using the traditional fracture mechanism, their researches were not sufficient to do it: the damage zone of glass fiber/epoxy laminates was occurred at the delamination zone instead of the crack-metallic damages. Thus, previous researches were not applicable to the fatigue behavior of glass fiber/epoxy laminates. The major purpose of this study was to evaluate delamination behavior using the relationship between crack length and delamination width in hybrid composite material such as Al/GFRP laminate. The details of investigation were as follows : 1) Relationship between crack length and delamination width, 2) Relationship between delamination aspect ratio and delamination area rate, 3) Variation of delamination growth rate is attendant on delamination shape factors. The test results indicated that the delamination growth rate depends on delamination width delamination aspect ratio and delamination shape factors.

Development of jute rope hybrid composite plate using carbon fibre

  • Nouri, Karim;Alam, Md. Ashraful;Mohammadhassani, Mohammad;Jumaat, Mohd Zamin Bin;Abna, Amir Hosein
    • Structural Engineering and Mechanics
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    • 제56권6호
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    • pp.1095-1113
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    • 2015
  • Jute rope is one of the most popular materials used for composites in various industries and in civil engineering. This experimental study investigated two types of jute rope with different diameters for jute rope composite plates to determine the best combination of jute rope and carbon fiber in terms of ratio and physical and mechanical properties. Eight combinations of carbon fiber and jute rope with different percentages of carbon fiber were analyzed. Tensile tests for the jute rope composite plate and hybrid jute rope composite were conducted, and the mechanical and physical properties of the specimens were compared. Thereafter, the ideal combinations of jute rope with an optimum percentage of carbon fiber were identified and recommended. These particular combinations had tensile strengths that were 2.23 times and 1.76 times higher than other varieties in each type.

하이브리드 FRP 보강근의 상대 리브면적에 따른 부착 특성 (Bond Characteristics of Hybrid Fiber Polymer Reinforcing bars with Different Relative Rib Area)

  • 박지선;유영찬;박영환;유영준;김형열;김긍환
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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    • pp.201-204
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    • 2005
  • The bond characteristics of two types hybrid FRP (fiber reinforced polymer) reinforcing bars with different rib geometry were analyzed experimentally. Two types of hybrid FRP. reinforcing bars such as spiral and cross type with different relative rib area were considered in this test. All testing procedures including specimens preparation, set-up of test equipments and measuring devices were made according to the recommendations of CSA Standard S806-02. From the test results, it was found' that cross type hybrid FRP reinforcing bars showed the higher bond strength than that of spiral type's due to the higher relative rib area.

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하이브리드 강섬유 사용에 따른 초고성능 콘크리트의 인성 향상 평가 (Evaluation of Advanced Ductility of Ultra High Performance Concrete with Hybrid type of Steel Fiber)

  • 류금성;고경택;강수태;박정준;강현진;김성욱
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2010년도 춘계 학술대회 제22권1호
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    • pp.437-438
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    • 2010
  • 본 연구에서는 하이브리드 강섬유를 사용한 초고성능 콘크리트의 휨거동특성에 미치는 효과를 평가 하였다. 하이브리드 섬유 사용 UHPC의 휨거동을 평가한 결과, 하이브리드 강섬유를 체적비로 2% 혼입 시 단독으로 강섬유를 사용하는 경우에 비해 휨강도가 약 27%(최대 50%)이상 향상되었고, 1.5% 혼입 시 현행 UHPC의 휨강도를 상회하고 있는 것으로 나타났다.

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Decision directed PLL을 이용한 BPSK Homodyne 광 수신기의 성능에 관한 연구 (A Study on the Performance of BPSK Homodyne Optical Receiver User the Decision Directed PLL)

  • Lee, Ho-Joon
    • 대한전자공학회논문지
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    • 제27권4호
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    • pp.598-603
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    • 1990
  • This study evaluates the performance of an optical receiver for binary phase shift keying (BPSK) signals in the presence of short noise originating from the photo diode and phase noise of the optical source. The case of using I.O. hybrid compare with the fiber optic hybrid to mix received optical signal and laser local oscillator signal. The impact of these noise is minimized if loop natural frequency and power split ratio between data and carrier recovery branch are choosen optimally. Then it is obtained that required laser linewidt to achieve a BER of 10**-9. The results are the same except theat in case of using the fiber optic hybrid the required optical power is twice as much as the I.O. hybrid.

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Stiffened orthotropic corner supported hypar shells: Effect of stiffener location, rise/span ratio and fiber orientaton on vibration behavior

  • Darilmaz, Kutlu
    • Steel and Composite Structures
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    • 제12권4호
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    • pp.275-289
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    • 2012
  • In this paper the influence of stiffener location, rise/span ratio and fibre orientation on vibration behavior of corner supported hypar shells is studied by using a four-node hybrid stress finite element. The formulation of the element is based on Hellinger-Reissner variational principle. The element is developed by combining a hybrid plane stress element and a hybrid plate element. Benchmark problems are solved to validate the approach and free vibration response of stiffened orthotropic hypar shells is studied both with respect to fundamental frequency and mode shapes by varying the location of stiffeners, rise/span ratio and fiber orientation.

하이브리드 FRP 보강근의 형상개발과 부착성능 평가 (Development of Hybrid Fiber Reinforced Polymer Reinforcing Bars and Evaluation of the Bond Properties)

  • 박지선;박영환;유영준;김긍환
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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    • pp.629-632
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    • 2006
  • The various rib geometry of hybrid fiber reinforced polymer (FRP) reinforcing bars were analyzed by finite element method. From the analysis result, two types of hybrid FRP reinforcing bars such as spiral and cross type with the same dimension of rib geometry were fabricated in this study. To evaluate the bond properties of them, direct pull-out test was performed. All testing procedures including specimens preparation, set-up of test equipments and measuring devices were made in accordance with the recommendations of CSA Standard S806-02. From the test results, it was found that cross type hybrid FRP reinforcing bars showed the highest bond strength than that of the others due to the higher relative rib area.

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유리섬유/알루미늄 혼합 적층판의 파괴과정과 음향방출 특성 (Acoustic Emission Characteristics during fracture Process of Glass Fiber/Aluminum Hybrid Laminates)

  • 우성충;최낙삼
    • 비파괴검사학회지
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    • 제25권4호
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    • pp.274-286
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    • 2005
  • 본 연구에서는 편측노치를 갖는 단일 hi판 및 유리섬유/알루미늄 혼합 적층판에 대해 인장하중하의 파괴거동에 따른 음향방출(AE) 특성을 살펴보았다. 단일 알루미늄의 파괴시에 발생하는 AE신호는 저주파수 대역을 갖는 신호와 고주파수 대역을 갖는 신호의 2가지 형태로 분류될 수 있었다. 고주파수 대역의 AE는 0.45mm 변위 보다 큰 후반부 하중단계에서 주로 검출되었다. 유리섬유/알루미늄 혼합 적층판의 경우에는, 고진폭의 긴 유지시간의 신호가 FFT 주파수 해석에 의거하여 거시적인 균열진전이나 A1층과 섬유층 사이의 층간분리에 해당하는 신호로 추정되었다. 위와 같은 AE신호의 해석결과와 광학현미경 및 초음파 스캔에 의한 파괴관찰에 의거하여 섬유층 배향에 따라 상이한 섬유/알루미늄 적층판의 파괴거동과 관련된 AE특성을 규명하였다.