• Title/Summary/Keyword: CaSR

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Dielectric Properties of $(Ba,Sr,Ca)TiO_{3}$ Ceramics with Additon of Dopant (불순물 첨가에 따른 $(Ba,Sr,Ca)TiO_{3}$ 세라믹의 유전특성)

  • Lee, Sung-Gap;Lee, Young-Hie;Lim, Sung-Soo;Park, In-Gil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11b
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    • pp.42-45
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    • 2001

  • $(Ba_{0.6}Sr_{0.4}Ca_{x})TiO_{3}+yZrO_{2}$ wt% (x=0.10, 0.15, 0.20, y=0.5~3.0) specimens were fabricated by the mixed-oxide method and then the structural and dielectric properties as a function of the composition ratio and $ZrO_2$ contents were studied. All BSCT specimens showed dense and homogeneous structure without the presence of the seconds phase. The Curie temperature and the dielectric constant at room temperature decreased with increasing the Ca/Ba composition ratio and $ZrO_2$ content. The BSCT(50/40/10) specimens showed the excellent tunability property. And the tunability were increased with increasing the contents of $ZrO_2$.

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Diabetic Alterations in Cardiac Sarcoplasmic Reticulum $Ca^{2+}$-ATPase and Phospholamban Protein Expression

  • Lee, Hee-Ran;Cho, Yong-Sun;Park, So-Young;Kim, Young-Hoon;Kim, Hae-Won
    • Proceedings of the Korean Biophysical Society Conference
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    • 2001.06a
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    • pp.66-66
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    • 2001

  • Diabetic cardiomyopathy has been suggested to be caused by abnormal intracellular $Ca^{2＋}$ homeostasis in the myocardium, which is partly due to a defect in calcium transport by the cardiac sarcoplasmic reticulum (SR). In the present study, the underlying mechanism for this functional derangement was investigated with respect to SR $Ca^{2＋}$-ATPase and phospholamban (PLB, the inhibitor of SR $Ca^{2+}$-ATPase).(omitted)d)

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Effect of Doping Elements on Superconducting Characteristics in Bi-system Ceramics (Bi계 세라믹에서 초전도체 특성에 미치는 도우핑 원소의 영향)

  • 양승호;박용필;김용주
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.198-203
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    • 2000

  • This paper investigated the effects of doping elements on the Bi-Sr-Ca-Cu-O ceramics. The doping elements can be classified into four groups depending on their superconducting characteristics in the Bi-Sr-Ca-Cu-O structure. The first group of doping elements(Co, Fe, Ni and Zn) substitute into the copper site and can reduce the critical temperatures of the 2223 and 2212 phases. The second group of doping elements(Y and La) substitute into the Ca site and cause the disappearance of the 2223 phase and increase the critical temperatures in the 2212 phase. The third group of doping elements(P and K) have a tendency to decompose the superconducting phase and reduce the optimal sintering temperature. The fourth group of doping elements(B, Si, Sn and Ba) almost unaffected the superconductivity of the 2223 and 2212 phase.

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Dielectric Properties of (Ba,Sr,Ca)$TiO_3$ Ceramics with Addition of Dopant (불순물 첨가에 따른 (Ba,Sr,Ca)$TiO_3$ 세라믹의 유전특성)

  • 이성갑;이영희;임성수;박인길
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11a
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    • pp.42-45
    • /
    • 2001

  • (Ba$_{0.6-x}$Sr$_{0.4}$Ca$_{x}$)TiO$_3$+yZrO$_2$wt% (x=1.10, 0.15, 0.20, y=0.5~3.0) specimens were fabricated by the mixed and ZrO$_2$ contents were studied. All BSCT specimens contents were studied. All BSCT specimens showed dense and homogeneous structure without the presence of the seconds phase. The Curie temperature and the dielectric constant at room temperature decreased with increasing the Ca/Ba composition ratio and ZrO$_2$ content. The BSCT(50/40/10) specimens showed the excellent tunability property. And the tunability were increased with increasing the contents of ZrO$_2$./TEX>.

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