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Vibration of angle-ply laminated composite circular and annular plates
Kadir Mercan,Farzad Ebrahimi,Ömer Civale 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.34 No.1
In the present paper, free vibration analysis of angle-ply laminated composite annular and circular plates is performed by numerical methods. First-order shear deformation plate theory is used for kinematic relations. The related governing equations of motion are discretized via differential quadrature and discrete singular convolution methods. Frequency values are obtained for different lamina scheme, thickness-to-radius ratio, and mode numbers. The advantages and accuracy of these two methods are also tested in detail.
Kim, Jeehoon,Haberkorn, N.,Nazaretski, E.,Paula, R. de,Tan, Teng,Xi, X.X.,Tajima, T.,Movshovich, R.,Civale, L. Elsevier 2015 Solid state communications Vol.204 No.-
<P><B>Abstract</B></P> <P>We report the influence of two-band superconductivity on the flux creep and the critical current densities of a MgB<SUB>2</SUB> thin film. The small magnetic penetration depth of <I>λ</I>=50±10nm at <I>T</I>=4K is related to a clean π-band. We find a high self-field critical current density <I>J</I> <SUB> <I>c</I> </SUB>, which is strongly reduced with applied magnetic field, and attribute this to suppression of the superconductivity in the π-band. The temperature dependence of the creep rate <I>S</I> (<I>T</I>) at low magnetic field can be explained by a simple Anderson–Kim mechanism. The system shows high pinning energies at low field that are strongly suppressed by high field.</P>
Imaging magnetic domains in vector magnetic fields via magnetic force microscopy
Dirk WULFERDING,Ilkyu YANG,Hoon KIM,Oscar AYALA-VALENZUELA,Minkyung LEE,Hee Cheul CHOI,Filip RONNING,Leonardo CIVALE,Ryan BAUMBACH,Eric BAUER,Joe THOMPSON,Roman MOVSHOVICH,Jeehoon KIM 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8