The Experts below are selected from a list of 15066 Experts worldwide ranked by ideXlab platform
Susan C. Hagness - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetic Spectroscopy of Normal Breast Tissue Specimens Obtained From Reduction Surgeries: Comparison of Optical and Microwave Properties
IEEE Transactions on Biomedical Engineering, 2008Co-Authors: Mariya Lazebnik, Gregory M. Palmer, Josephine Harter, Sarah Sewall, Nirmala Ramanujam, Susan C. HagnessAbstract:Techniques utilizing Electromagnetic energy at microwave and optical frequencies have been shown to be promising for breast cancer detection and diagnosis. Since different biophysical mechanisms are exploited at these frequencies to discriminate between healthy and diseased tissue, combining these two modalities may result in a more powerful approach for breast cancer detection and diagnosis. Toward this end, we performed microwave dielectric Spectroscopy and optical diffuse reflectance Spectroscopy measurements at the same sites on freshly excised normal breast tissues obtained from reduction surgeries at the University of Wisconsin Hospital, using microwave and optical probes with very similar sensing volumes. We found that the microwave dielectric constant and effective conductivity are correlated with tissue composition across the entire measurement frequency range (|r| ~ 0.5-0.6, p < 0.01) and that the optical absorption coefficient at 460 nm and optical scattering coefficient are correlated with tissue composition (|r| ~ 0.4-0.6, p < 0.02). Finally, we found that the optical absorption coefficient at 460 nm is correlated with the microwave dielectric constant and effective conductivity (r = -0.55, p < 0.01). Our results suggest that combining optical and microwave modalities for analyzing breast tissue samples may serve as a crosscheck and provide complementary information about tissue composition.
A.m. Konn - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetic and magnetic properties of multicomponent metal oxides heterostructures: Nanometer versus micrometer-sized particles
Journal of Applied Physics, 2003Co-Authors: Christian Brosseau, Jamal Ben Youssef, Philippe Talbot, A.m. KonnAbstract:We have measured the composition and frequency-dependent complex effective permittivities and permeabilities in zero applied field of a series of ZnO and ferrimagnetic γ-Fe2 O3 composites prepared by powder pressing. The overall features of the room temperature Electromagnetic properties of these diluted magnetic semiconductor composites exhibit a strong dependence on the powder size of the starting materials. For instance, Electromagnetic Spectroscopy over the frequency range (300 MHz–10 GHz) shows that composites made of nanoparticles (N-type samples) display a strong increase of the real and imaginary parts of the permeability compared to composites made of micron-sized particles (M-type samples). The observed dielectric behavior as a function of composition is manifestly at odds with the predictions from the simple property-averaging continuum model of Bruggeman. Additionally, a gyromagnetic resonance in the gigahertz region of frequency has been established for N-type samples which is not observable ...
Mariya Lazebnik - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetic Spectroscopy of Normal Breast Tissue Specimens Obtained From Reduction Surgeries: Comparison of Optical and Microwave Properties
IEEE Transactions on Biomedical Engineering, 2008Co-Authors: Mariya Lazebnik, Gregory M. Palmer, Josephine Harter, Sarah Sewall, Nirmala Ramanujam, Susan C. HagnessAbstract:Techniques utilizing Electromagnetic energy at microwave and optical frequencies have been shown to be promising for breast cancer detection and diagnosis. Since different biophysical mechanisms are exploited at these frequencies to discriminate between healthy and diseased tissue, combining these two modalities may result in a more powerful approach for breast cancer detection and diagnosis. Toward this end, we performed microwave dielectric Spectroscopy and optical diffuse reflectance Spectroscopy measurements at the same sites on freshly excised normal breast tissues obtained from reduction surgeries at the University of Wisconsin Hospital, using microwave and optical probes with very similar sensing volumes. We found that the microwave dielectric constant and effective conductivity are correlated with tissue composition across the entire measurement frequency range (|r| ~ 0.5-0.6, p < 0.01) and that the optical absorption coefficient at 460 nm and optical scattering coefficient are correlated with tissue composition (|r| ~ 0.4-0.6, p < 0.02). Finally, we found that the optical absorption coefficient at 460 nm is correlated with the microwave dielectric constant and effective conductivity (r = -0.55, p < 0.01). Our results suggest that combining optical and microwave modalities for analyzing breast tissue samples may serve as a crosscheck and provide complementary information about tissue composition.
Heng Luo - One of the best experts on this subject based on the ideXlab platform.
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Structural magnetic loss of vertical aligned carbon fibres
Journal of Applied Physics, 2013Co-Authors: Wen Hong, Peng Xiao, Heng LuoAbstract:The Electromagnetic Spectroscopy of vertical aligned carbon fibres (VACF) reinforced epoxy resin has been performed in the frequency range from 8.2 to 12.4 GHz. The composite was prepared by conventional epoxy polymerization. The results indicate VACF could possess magnetic loss and the structural magnetic properties could be tailored by adjusting the forest structure. The corresponding mechanism of the structural magnetic properties is proposed by the Faradays’ law of induction. The structural magnetism is further confirmed by measuring VACF reinforced Al2O3 composites in 1073 K environment. The measurement agrees well with the trend predicted by the parallel fibres model. These results represent a crucial step towards high temperature microwave absorber design and open a new avenue for realizing magnetic losses in the dielectric material.
Christian Brosseau - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetic and magnetic properties of multicomponent metal oxides heterostructures: Nanometer versus micrometer-sized particles
Journal of Applied Physics, 2003Co-Authors: Christian Brosseau, Jamal Ben Youssef, Philippe Talbot, A.m. KonnAbstract:We have measured the composition and frequency-dependent complex effective permittivities and permeabilities in zero applied field of a series of ZnO and ferrimagnetic γ-Fe2 O3 composites prepared by powder pressing. The overall features of the room temperature Electromagnetic properties of these diluted magnetic semiconductor composites exhibit a strong dependence on the powder size of the starting materials. For instance, Electromagnetic Spectroscopy over the frequency range (300 MHz–10 GHz) shows that composites made of nanoparticles (N-type samples) display a strong increase of the real and imaginary parts of the permeability compared to composites made of micron-sized particles (M-type samples). The observed dielectric behavior as a function of composition is manifestly at odds with the predictions from the simple property-averaging continuum model of Bruggeman. Additionally, a gyromagnetic resonance in the gigahertz region of frequency has been established for N-type samples which is not observable ...