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You searched on: Author: sudook kim Sorted by: date

Displaying records 1 to 10 of 44 records.
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1. Nonlinear resonant acoustic detection of cracks in multilayer ceramic capacitors
Published: 9/3/2014
Authors: Ward L Johnson, Sudook A. Kim, Grady S White, Jaemi Herzberger
Abstract: Abstract,Measurements of resonant ultrasonic frequencies of multilayer ceramic capacitors (MLCC) were performed as a function of excitation amplitude to assess the potential of nonlinear acoustic methods for sensing the presence of cracks. The ultima ...

2. Nonlinear acoustic effects in multilayer ceramic capacitors
Published: 1/25/2013
Authors: Ward L Johnson, Sudook A. Kim, Timothy P Quinn, Grady S White
Abstract: Nonlinear resonant acoustics was explored as an approach for nondestructively evaluating the susceptibility of BaTiO3-based multilayer ceramic capacitors to electrical failure during service. The acoustic nonlinearity was characterized through measu ...

3. Vibrational modes of GaN nanowires in the gigahertz range
Published: 11/13/2012
Authors: Ward L Johnson, Sudook A. Kim, Roy H. Geiss, Colm Flannery, Kristine A Bertness, Paul R Heyliger
Abstract: Monocrystalline nanowires offer an attractive basis for resonant nanoelectromechanical systems (NEMS) for a variety of applications, including mass and force sensing, and, in each of these applications, there are advantages to operation at frequenci ...

4. Contributions to anelasticity in langasite and langatate
Published: 12/30/2011
Authors: Ward L Johnson, Sudook A. Kim, Christine F. Rivenbark, Satoshi Uda
Abstract: Maximization of the quality factors Q of langasite (LGS) and langatate (LGT) is necessary for optimal performance of acoustic resonators of these materials in frequency-control and high-temperature sensing applications. In this report, measurements ...

5. Ultrasonic Detection of Defects in Multilayered Ceramic Capacitors for Active Implantable Medical Devices
Published: 8/8/2011
Authors: Sudook A. Kim, Ward L Johnson, Grady S White, Roger Roberts
Abstract: Resonant ultrasound spectroscopy (RUS) was used to measure the acoustic frequencies of surface-mountable X7R multilayered ceramic capacitors (MLCC), with the aim of determining whether RUS can serve as a nondestructive method for detecting structural ...

6. Effects of shape distortions and imperfections on mode frequencies and collective linewidths in nanomagnets
Published: 3/28/2011
Authors: Hans Toya Nembach, Justin M Shaw, Thomas J Silva, Ward L Johnson, Sudook A. Kim, Robert D McMichael, Pavel Kabos
Abstract: We used Brillouin light scattering to show that shape distortions in Ni80Fe20 nanoelements can have a dramatic effect on the measured linewidth of certain modes. By intentionally introducing an amount of ,egg-likeŠ shape distortion to an ideal ellip ...

7. From the bottom up ‹ measuring bulk mechanical properties via microtechnology
Published: 6/10/2010
Authors: Nicholas Barbosa, Sudook A. Kim, David Thomas Read
Abstract: The micromechanics community has developed a large set of tools for measuring the properties of micro- and nano-scaled materials. These new tools have been successfully applied to a range of materials, most often in thin-film form, to determine the c ...

8. Elastic constants and dimensions of imprinted polymeric nanolines determined from Brillouin light scattering
Published: 1/18/2010
Authors: Ward L Johnson, Sudook A. Kim, Roy H. Geiss, Colm Flannery, Paul R Heyliger, Christopher L Soles, Wen-Li Wu, Chengqing C. Wang, Christopher M Stafford, B D. Vogt
Abstract: Elastic constants and cross-sectional dimensions of imprinted nanolines of poly(methyl methacrylate) (PMMA) on silicon are determined nondestructively from finite-element inversion analysis of dispersion curves of hypersonic acoustic modes of these ...

9. Optimization of arrays of gold nanodisks for plasmon-mediated Brillouin light scattering
Published: 7/22/2009
Authors: Ward L Johnson, Sudook A. Kim, Zhandos Utegulov, B. T. Draine
Abstract: Distributions of electric fields in two-dimensional arrays of gold nanodisks on a Si3N4 membrane, with light incident through the membrane, are modeled with the aim of determining array geometries for effective plasmon-mediated Brillouin light scat ...

10. Surface-plasmon-enhanced electric fields in two-dimensional arrays of gold nanodisks
Published: 8/4/2008
Authors: Ward L Johnson, Sudook A. Kim, Zhandos Utegulov, B. T. Draine
Abstract: Electric-field distributions in two-dimensional arrays of gold nanodisks on Si3N4 membranes are modeled, using the discrete-dipole approximation, as a function of nanodisk diameter (20 − 50 nm), height (10 − 100 nm), ratio of the array sp ...

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