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Chi-kuang Sun - One of the best experts on this subject based on the ideXlab platform.

  • Terahertz scanning imaging with a subwavelength Plastic Fiber
    Applied Physics Letters, 2008
    Co-Authors: Chui Min Chiu, Chung Chiu Kuo, Yuh-jing Hwang, Ci-ling Pan, Chih Hsien Lai, Hung Chung Chang, Chi-kuang Sun
    Abstract:

    The feasibility to perform Fiber-scanning terahertz imaging utilizing a terahertz subwavelength Plastic Fiber is investigated. Our study shows that, with a low (

  • THz interferometric imaging using subwavelength Plastic Fiber based THz endoscopes
    Optics express, 2008
    Co-Authors: Chung Chiu Kuo, Chui Min Chiu, Hung-wen Chen, Yuh-jing Hwang, Ci-ling Pan, Chi-kuang Sun
    Abstract:

    We demonstrate a new reflective imaging technique using continuous-wave THz Fiber-endoscopy, in which the sample is placed behind the output of a THz subwavelength Plastic Fiber and the Fabry Perot interference is formed therein. 3D THz reflective images with a reasonable SNR as well as high lateral and subwavelength axial resolutions are acquired by moving the sample along the axial (z) direction and by 2D scanning the output end of the subwavelength Plastic Fiber without any focusing medium. By analyzing the axial-position dependent THz signals backward collected by the subwavelength Plastic Fiber, the THz reflection amplitudes and phases on the sample surface can be successfully reconstructed.

  • THz interferometric imaging using subwavelength Plastic Fiber based THz endoscopes
    2008 Conference on Lasers and Electro-Optics, 2008
    Co-Authors: Chung Chiu Kuo, Chui Min Chiu, Hung-wen Chen, Ci-ling Pan, Chi-kuang Sun
    Abstract:

    We demonstrate a continuous-wave THz Fiber-endoscopy by utilizing low-loss THz subwavelength Plastic Fibers. The reconstructed 3D images not only reflect the depth variation of the object surface, but also reveal the molecular distribution of samples.

  • Sub-wavelength THz Plastic Fibers
    Terahertz and Gigahertz Electronics and Photonics VI, 2007
    Co-Authors: Hung-wen Chen, Li-jin Chen, Chi-kuang Sun
    Abstract:

    In this report, we will review our recent development on the sub-wavelength Plastic Fiber for THz waveguiding. The proposed and demonstrated terahertz single-mode sub-wavelength waveguide is similar to an optical taper Fiber, having a low attenuation constant (~10 -2 cm -1 ), a high coupling efficiency, and a free-space direct coupling capability, comprised with a sub-wavelength PE Fiber core with air cladding. The spectral characteristic of the sub-wavelength THz Fiber will be discussed, with an effective attenuation minimum of THz waves on the order of or less than 10 -3 cm -1 at a specific wavelength range which depends on the Fiber diameter. More over, the application of the sub-wavelength Plastic Fiber will also be discussed, including a first demonstration of a singlemode Fiber-based THz directional coupler.

  • low loss subwavelength Plastic Fiber for terahertz waveguiding
    Optics Letters, 2006
    Co-Authors: Li-jin Chen, Hung-wen Chen, Tzengfu Kao, Chi-kuang Sun
    Abstract:

    We report a simple subwavelength-diameter Plastic wire, similar to an optical Fiber, for guiding a terahertz wave with a low attenuation constant. With a large wavelength-to-Fiber-core ratio, the fractional power delivered inside the lossy core is reduced, thus lowering the effective Fiber attenuation constant. In our experiment we adopt a polyethylene Fiber with a 200 µm diameter for guiding terahertz waves in the frequency range near 0.3 THz in which the attenuation constant is reduced to of the order of or less than 0.01 cm−1. Direct free-space coupling efficiency as high as 20% can be achieved by use of an off-axis parabolic mirror. Furthermore, all the Plastic wires are readily available, with no need for complex or expensive fabrication.

Ki Hyun Kim - One of the best experts on this subject based on the ideXlab platform.

  • thermo Plastic Fiber s reinforcing effect on hot mix asphalt concrete mixture
    Construction and Building Materials, 2014
    Co-Authors: Pyeong Jun Yoo, Ki Hyun Kim
    Abstract:

    Abstract We propose a method for predicting the direct tensile bond strength of Plastic Fiber-reinforced hot-mix asphalt (HMA) mixtures. The toughening effects of the Plastic Fiber-reinforced HMA mixtures are characterized using the direct tensile loading test. A method for calculating the effective Fiber volume fraction along the failure plane is proposed to estimate the interfacial bond strength along the failure plane. The average interfacial bond strength resulted in the value of τ  = 0.12 N/mm 2 . Comparing to the maximum tensile stress at the peak of 0.47 N/mm 2 , the Fiber’s contribution to resisting the failure is approximately 25.5%. The generality of the direct tensile loading approach was confirmed by the experimental data from the direct tensile tests and three-point bending beam tests.

  • Thermo-Plastic Fiber’s reinforcing effect on hot-mix asphalt concrete mixture
    Construction and Building Materials, 2014
    Co-Authors: Pyeong Jun Yoo, Ki Hyun Kim
    Abstract:

    Abstract We propose a method for predicting the direct tensile bond strength of Plastic Fiber-reinforced hot-mix asphalt (HMA) mixtures. The toughening effects of the Plastic Fiber-reinforced HMA mixtures are characterized using the direct tensile loading test. A method for calculating the effective Fiber volume fraction along the failure plane is proposed to estimate the interfacial bond strength along the failure plane. The average interfacial bond strength resulted in the value of τ  = 0.12 N/mm 2 . Comparing to the maximum tensile stress at the peak of 0.47 N/mm 2 , the Fiber’s contribution to resisting the failure is approximately 25.5%. The generality of the direct tensile loading approach was confirmed by the experimental data from the direct tensile tests and three-point bending beam tests.

Pyeong Jun Yoo - One of the best experts on this subject based on the ideXlab platform.

  • thermo Plastic Fiber s reinforcing effect on hot mix asphalt concrete mixture
    Construction and Building Materials, 2014
    Co-Authors: Pyeong Jun Yoo, Ki Hyun Kim
    Abstract:

    Abstract We propose a method for predicting the direct tensile bond strength of Plastic Fiber-reinforced hot-mix asphalt (HMA) mixtures. The toughening effects of the Plastic Fiber-reinforced HMA mixtures are characterized using the direct tensile loading test. A method for calculating the effective Fiber volume fraction along the failure plane is proposed to estimate the interfacial bond strength along the failure plane. The average interfacial bond strength resulted in the value of τ  = 0.12 N/mm 2 . Comparing to the maximum tensile stress at the peak of 0.47 N/mm 2 , the Fiber’s contribution to resisting the failure is approximately 25.5%. The generality of the direct tensile loading approach was confirmed by the experimental data from the direct tensile tests and three-point bending beam tests.

  • Thermo-Plastic Fiber’s reinforcing effect on hot-mix asphalt concrete mixture
    Construction and Building Materials, 2014
    Co-Authors: Pyeong Jun Yoo, Ki Hyun Kim
    Abstract:

    Abstract We propose a method for predicting the direct tensile bond strength of Plastic Fiber-reinforced hot-mix asphalt (HMA) mixtures. The toughening effects of the Plastic Fiber-reinforced HMA mixtures are characterized using the direct tensile loading test. A method for calculating the effective Fiber volume fraction along the failure plane is proposed to estimate the interfacial bond strength along the failure plane. The average interfacial bond strength resulted in the value of τ  = 0.12 N/mm 2 . Comparing to the maximum tensile stress at the peak of 0.47 N/mm 2 , the Fiber’s contribution to resisting the failure is approximately 25.5%. The generality of the direct tensile loading approach was confirmed by the experimental data from the direct tensile tests and three-point bending beam tests.

  • Fiber's Interfacial Bond Strength Analysis using Direct Tensile Loading Tests
    2014
    Co-Authors: Byung Sik Ohm, J Y Choi, Pyeong Jun Yoo
    Abstract:

    This study presents an analytic approach for predicting the direct tensile bond strength of recycled Plastic Fiber-reinforced hot-mix asphalt (HMA) mixtures. The toughening effects of the recycled Plastic Fiber-reinforced HMA mixtures were characterized using the direct tensile loading test developed here. The direct tensile loading approach is based on a law that separates the composite stress of the mixture into the matrix and Fiber stress components. A method for calculating the effective Fiber volume fraction along the failure plane is proposed to estimate the interfacial bond strength along the failure plane. The average interfacial bond strength resulted in the value of τ = 0.12 N/mm². Comparing to the maximum tensile stress at the peak of 0.47 N/mm², the Fiber's contribution to resisting the failure is approximately 25.5%. The interfacial bond strength could be predicted using this approach because of the composite mixture failure resulting from the failure of the Fiber and matrix interfacial bond. The generality of the direct tensile loading approach was confirmed by the experimental data from the direct tensile tests and three-point bending beam tests.

  • Toughening characteristics of Plastic Fiber-reinforced hot-mix asphalt mixtures
    KSCE Journal of Civil Engineering, 2012
    Co-Authors: Pyeong Jun Yoo, Byung Sik Ohm, J Y Choi
    Abstract:

    With the performance limitation of a conventional hot-mix asphalt mixture, the structural integrity of that is highly needed to be enhanced to increase the fatigue life of the mixture. Various geosynthetic alternatives have been widely utilized, such as geogrid, geotextile, or geomembrane layers at the bottom the mixture or on the top of a subgrade to improve the structural integrity of a hot-mix asphalt pavement system. Although reinforcing effects of such interlayers has been reported with some improvements in hot-mix asphalt pavements’ performances, such as mitigating rut or delaying reflective cracks; however, such alternatives do not enhance toughness, tensile strength, or shear strength of the hot-mix asphalt mixture itself due to that the interlayers are usually installed in between two layers in a pavement system and those interlayers do not mix with hot-mix asphalt mixtures. A new Plastic Fiber-reinforced hot-mix asphalt mixture was proposed in this study to provide more enhanced structural integrity of the mixture not only at the bottom of the mixture but also within the mixture. The developed mixture in this study led to significant enhancements in phenomenological toughness and fatigue life of that at least 1.5 times higher than those for conventional hot-mix asphalt mixtures as resulting from indirect cyclic fatigue tests in loading-control modes and four-point bending beam tests in displacement-control modes.

Chung Chiu Kuo - One of the best experts on this subject based on the ideXlab platform.

Chui Min Chiu - One of the best experts on this subject based on the ideXlab platform.