• Title/Summary/Keyword: 자기 특성

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Neutron Irradiation Effects on the Magnetic Properties in Fe87Zr7B6 Amorphous Alloy (비정질 Fe87Zr7B6 합금의 중성자 조사량에 따른 자기적 특성변화)

  • Kim, Kyeong-Sup;Kim, Hyo-Chol;Yu, Seong-Cho
    • Journal of the Korean Magnetics Society
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    • v.15 no.1
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    • pp.12-16
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    • 2005

  • The $Fe_{87}Zr_{7}B_{6}$ amorphous alloy after neutron irradiation are studied hysteresis loop and complex permeability measurements. The total integration fluence of fast neutrons is varied from $1.92{\times}10^{14}$ to $4.85{\times}10^{16}n_{f1}cm^{-2}$. After neutron irradiation, the imaginary part of complex permeability in low frequency region decreased due to the decrease of wall motion, but the permeability in high frequency region increased due to the enhancement of rotational magnetization. The measurement of hysteresis loop showed the increase of magnetic softness, related to rotational magnetization, but saturation magnetization was decreased in neutron irradiation sample.

  • https://doi.org/10.4283/JKMS.2005.15.1.012 인용 PDF KSCI

Properties of Hydration Heat with Compressive Strength Level of High Flowing Self-Compacting Concrete (고유동 자기충전 콘크리트의 압축강도 수준에 따른 수화발열 특성)

  • Choi, Yun Wang;Jung, Jea Gwone;Lee, Jae Nam;Kim, Byoung Kwon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.29 no.5A
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    • pp.531-541
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    • 2009

  • The research analyzes and investigates conventional concrete, hydration heat, set, and mechanical properties by making high flowing self-compacting concretes of binary blend and ternary blend as one of evaluations about the properties of the hydration heat of high flowing self-compacting concrete with a strength of 30, 50, and 70 MPa. In addition, it estimates concrete adiabatic temperatures by calculating a thermal property value of powder obtained by measuring a heat evolution amount for powder used in concrete, a thermal property value of concrete obtained by conducting a simple adiabatic temperature test, and a normal thermal property value of material used in concrete, using a simple equation. Moreover, it analyzes and investigates the hydration heat property of high flowing self-compacting concrete and the thermal stress caused by hydration heat by conducting a 3D temperature stress analysis for the hydration heat and the adiabatic temperature obtained by temperature analysis, using MIDAS CIVIL 06 program.

  • https://doi.org/10.12652/Ksce.2009.29.5A.531 인용 PDF

Analysis of Cascode FETs Self Oscillator Mixer to Improve Image rejection (Cascode FETs형 자기발진 믹서의 이미지신호제거 개선 효과 분석)

  • 심재우;이영철
    • Proceedings of the IEEK Conference
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    • 2001.06a
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    • pp.429-432
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    • 2001

  • 본 논문에서는 Cascode FETs 구조를 능동필터로 동작시켜 이미지제거 특성을 분석하였으며, Cascode형 자기발진 믹서를 설계하였다. Ku-band 대역에서 모의실험 결과 Cas code FETs형 자기발진믹서에서 이미지성분이 -254Bc 개선되었으며, Single FET형 자기발진믹서와 비교해서 -23dBc 이상 개선됨을 확인할 수 있었다.

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