The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
B. L. Bhuva - One of the best experts on this subject based on the ideXlab platform.
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Single-Event Transient Measurement on a DC/DC PWM Controller Using Pulsed X-Ray Technique
2020Co-Authors: L. Chen, R. Wong, N. Van Vonno, Renfei Feng, B. L. BhuvaAbstract:Pulsed X-Rays were used to perform Single-Event Transient (SET) measurements on a Commercial Off-The- Shelf (COTS) DC/DC PWM controller. The results were consistent with those of the previous heavy ion and pulsed laser testing, which indicates that the pulsed X-Ray Technique is a complementary tool to investigate SET. However, there are some limitations, such as low energy absorption of X-Rays in silicon and Total Ionizing Dose (TID) effects due to the X-Ray irradiation, which need to be considered during X-Ray applications.
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Single-event transient measurement on a DC/DC PWM controller using Pulsed X-Ray Technique
2013 IEEE International Reliability Physics Symposium (IRPS), 2013Co-Authors: L. Chen, R.-f. Feng, R. Wong, N. Van Vonno, B. L. BhuvaAbstract:Pulsed X-Rays were used to perform Single-Event Transient (SET) measurements on a COTS DC/DC PWM controller. The results were consistent with those of the previous heavy ion and pulsed laser testings, which indicates that the pulsed X-Ray Technique is a complementary tool to investigate SET. However, there are some limitations, such as low energy absorption of X-Rays in silicon and total ionizing dose (TID) effects due to the X-Ray irradiation, which need to be considered during X-Ray applications.
Katherine T. Faber - One of the best experts on this subject based on the ideXlab platform.
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Through-thickness determination of phase composition and residual stresses in thermal barrier coatings using high-energy X-Rays
Acta Materialia, 2010Co-Authors: C. M. Weyant, Jonathan Almer, Katherine T. FaberAbstract:High-energy X-Rays were used to determine the local phase composition and residual stresses through the thickness of as-sprayed and heat-treated plasma-sprayed thermal barrier coatings consisting of a NiCoCrAlY bond coat and an yttria-stabilized zirconia (YSZ) topcoat produced with through-thickness segmentation cracks. The as-sprayed residual stresses reflected the combined influence of quenching stresses from the plasma spray process, thermal expansion mismatch between the topcoat, bond coat and substrate, and stress relief from the segmentation cracks. Heat treatments led to the formation of a thermally grown oxide (TGO) which was in compression in the plane, as well as relief of quenching stresses and development of a stress gradient in the YSZ topcoat. The high-energy X-Ray Technique used in this study revealed the effects that TGO and segmentation cracks have on the in-plane stress state of the entire coating. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
L. Chen - One of the best experts on this subject based on the ideXlab platform.
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Single-Event Transient Measurement on a DC/DC PWM Controller Using Pulsed X-Ray Technique
2020Co-Authors: L. Chen, R. Wong, N. Van Vonno, Renfei Feng, B. L. BhuvaAbstract:Pulsed X-Rays were used to perform Single-Event Transient (SET) measurements on a Commercial Off-The- Shelf (COTS) DC/DC PWM controller. The results were consistent with those of the previous heavy ion and pulsed laser testing, which indicates that the pulsed X-Ray Technique is a complementary tool to investigate SET. However, there are some limitations, such as low energy absorption of X-Rays in silicon and Total Ionizing Dose (TID) effects due to the X-Ray irradiation, which need to be considered during X-Ray applications.
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Single-event transient measurement on a DC/DC PWM controller using Pulsed X-Ray Technique
2013 IEEE International Reliability Physics Symposium (IRPS), 2013Co-Authors: L. Chen, R.-f. Feng, R. Wong, N. Van Vonno, B. L. BhuvaAbstract:Pulsed X-Rays were used to perform Single-Event Transient (SET) measurements on a COTS DC/DC PWM controller. The results were consistent with those of the previous heavy ion and pulsed laser testings, which indicates that the pulsed X-Ray Technique is a complementary tool to investigate SET. However, there are some limitations, such as low energy absorption of X-Rays in silicon and total ionizing dose (TID) effects due to the X-Ray irradiation, which need to be considered during X-Ray applications.
C. M. Weyant - One of the best experts on this subject based on the ideXlab platform.
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Through-thickness determination of phase composition and residual stresses in thermal barrier coatings using high-energy X-Rays
Acta Materialia, 2010Co-Authors: C. M. Weyant, Jonathan Almer, Katherine T. FaberAbstract:High-energy X-Rays were used to determine the local phase composition and residual stresses through the thickness of as-sprayed and heat-treated plasma-sprayed thermal barrier coatings consisting of a NiCoCrAlY bond coat and an yttria-stabilized zirconia (YSZ) topcoat produced with through-thickness segmentation cracks. The as-sprayed residual stresses reflected the combined influence of quenching stresses from the plasma spray process, thermal expansion mismatch between the topcoat, bond coat and substrate, and stress relief from the segmentation cracks. Heat treatments led to the formation of a thermally grown oxide (TGO) which was in compression in the plane, as well as relief of quenching stresses and development of a stress gradient in the YSZ topcoat. The high-energy X-Ray Technique used in this study revealed the effects that TGO and segmentation cracks have on the in-plane stress state of the entire coating. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Bandaru V Ramarao - One of the best experts on this subject based on the ideXlab platform.
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The 3D structure of fabric and its relationship to liquid and vapor transport
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2004Co-Authors: Sharadh Ramaswamy, U. Aaltosalmi, Mikko Kataja, A. Goel, Aki Koponen, M. Gupta, Bandaru V RamaraoAbstract:Polymeric carrier fabrics are commonly used in many industrial processes including manufacture of paper and board. Apart from acting as a carrier for the compressible porous material during the manufacturing process, the synthetic woven fabrics comprising mainly of poly ethylene terypthalate (PET) yarns, impart valuable product attributes, i.e. softness, bulk, absorbency, etc. in consumer products. The three-dimensional structure of the fabrics plays a critical role in deciding the manufacturing and energy efficiency as well as product end-use properties. X-Ray micro computed tomography (X-μCT) provides a non-intrusive Technique to visualize and analyze the three-dimensional structure of porous materials such as paper [The 3 Dimensional Structure of Paper and Its Relationship to Liquid and Vapor Transport, The Science of Papermaking, p. 1289; Tappi J 84 (2001) 1; APPITA 55 (2002) 230]. In this paper, we use this Technique to visualize the three-dimensional structure of polymeric fabrics commonly used in paper manufacture [The 3 Dimensional Structure of Paper and Its Relationship to Liquid and Vapor Transport, The Science of Papermaking, p. 1289; Tappi J. 84 (2001) 1; APPITA 55 (2002) 230]. Digital image analysis Techniques based on mathematical morphology and stereology were used to determine traditional pore descriptors such as porosity, yarn-void interfacial area, tortuosity and hydraulic radii distribution in the two principal orthogonal directions [The 3 Dimensional Structure of Paper and Its Relationship to Liquid and Vapor Transport, The Science of Papermaking, p. 1289; APPITA 55 (2002) 230]. Comparison of the average yarn diameter by X-μCT and image analysis and physical measurement using light microscopy agreed to within 3% indicating the good accuracy of the X-Ray Technique. The differences in fabric pore structural characteristics between the in-plane and transverse directions reported here help explain the differences in liquid and vapor transport in the two principal directions. Lattice-Boltzmann simulations of fluid flow and Monte-Carlo simulations of vapor diffusion through actual 3D structures of fabric provide a direct method to predict the permeability and diffusivity characteristics of these complex media. Comparison of structural characteristics between image analysis and simulations show reasonable agreement. © 2004 Elsevier B.V. All rights reserved.
