Papers by Keyword: Electrical Conduction

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Authors: Aiswarya Pradeepkumar, D. Kurt Gaskill, Francesca Iacopi
Abstract: Epitaxial cubic silicon carbide films on silicon have attracted extensive interest for semiconductor device applications such as high-voltage, high-frequency diodes, and hetero-junction bi-polar transistors [1]. This is because they can offer access to the properties of the SiC material such as its wide band gap and high thermal conductivity on the more conventional silicon substrates [2]. Rahimi et al. have shown, however, that the substantial tensile strain generated from the lattice and thermal expansion coefficient mismatch between 3C-SiC and silicon, may reduce the band gap in the SiC epitaxial films [3]. Nevertheless, the impact of this phenomenon on the electrical and electronic performance of the epitaxial SiC films on silicon has not been fully elucidated to date; such information is vital to obtain the optimal performance of devices fabricated from these strained heterojunctions.
Authors: Ping Li, Aik Seng Low, Yue Yan Shan, Guat Choon Ong, Xi Jiang Yin
Abstract: A carbon nanotubes (CNTs) composite and its electromagnetic interference shielding effectiveness (SE) were investigated. Its absorptance, reflectance and shielding effectiveness (SE) were analysed. The CNTs composite has a shielding effectiveness (SE) of more than 25 dB (>99.68%) in frequency range from 30 MHz to 5 GHz. The testing results also demonstrate that the shielding mechanism of the CNTs composite is mainly EMI absorption of electromagnitic radiation. The high SE of the CNTs composite in the study is attributed to a high aspect ratio (>3000) and good conductive network of CNTs within the composite.
Authors: Alexander Glot, A. Bondarchuk, S. Mazurik, G. Behr, Jens Werner
Authors: Yuan Jen Chang, Bing Chiuan Shiu, Jia Horng Lin, Ching Wen Lou
Abstract: This study aims to fabricate strong mechanical properties and electrical conduction woven fabric, which provides flexible and strength for application. Polyethylene Terephthalate fiber (PET fiber) having fine mechanical properties are widely used in industry, as well as metal fiber are often used on electromagnetic shielding and static electricity protection. This study took both advantages of PET fiber and metal fiber for water sensitive functional textile. The result showed that warp yarns has a tensile strength of 1363.3N/mm and weft yarns has a tensile strength of 1483.3N/mm. In addition, both textiles with 20 wt% water absorption can be electrical conduction. Various metal yarns have different electrical resistivity and conductivity with various water absorption percentage.
Authors: Jitender Kumar Quamara, Satish Kumar Mahna, Sohan Lal, Pushkar Raj
Abstract: The steady state measurements in Liquid crystalline polyurethane (LCPU) have been investigated for different fields (4 - 45 kV/cm) and temperatures (50°-220°C). The nature of conduction processes has been determined by estimating ion jump distances (a) and Schottky coefficients. The order of magnitude of a in the temperature region 150°C and below does not seem to support an ionic conduction. However the magnitude of a at higher temperatures (180°C and above) indicates the possibility of ionic conduction. There is a definite possibility of a Schottky type conduction at lower temperature and a Poole Frankel type conduction at higher temperature (100°C). The activation energy associated with the high temperature region lies between 0.26 eV and 0.65 eV depending on the field whereas in the low temperature region the activation energy lies between 0.82 eV and 0.95 eV depending on the applied electric field. The dual slopes in the log I versus 1/T curves indicate the presence of more than one type of trapping levels.
Authors: Bing Jie Zhang, Hui Ling Du, Cen Zhao
Abstract: Bismuth-based pyrochlore dielectrics with the formula (Bi1.5Zn0.5)(Ti1.5M0.5)O7 (M = Nb, Ta and Sb) have been synthesized to investigate the influence of M between the dielectric properties and crystal structure. The XRD patterns show that all of the three samples give single phase. The refined data by GSAS program and the bond valence theory were used to analyze the differences in dielectric properties with occupation of different ions in B site. The dielectric constant of BZTS is the smallest in the BZTM, which is due to the polarizability and the contribution of BO6 octahedra which has weak correlation when Sb placed into the center of the octahedra would also result in small αε. When it comes to the moderate temperature range, oxygen vacancies migration was thermally activated as the carriers mechanism, and the different activation energies is related to the association and the disassociation of massive complex defects. The Rietveld refinement data pointed that with the respectively change of B ions, more oxygen vacancies and free oxygen ions are provided by structural defects to participate in the conduction which can lead to the σ increase gradually.
Authors: L.P. Deshmukh, G.S. Shahane, D.S. Sutrave, P.P. Hankare
Authors: Howard Lau, Andrew Ruys, P. Carter, Xiu Wang, Qing Li
Abstract: Modelling of bioelectric phenomena in the human body poses unique problems compared to those encountered in other fields of engineering. Accurate definition of the physical domain and material properties is difficult due to geometrical complexity and uncertainty in tissue characterisation. A workflow is presented for finite element simulation of electric current in the body. This is illustrated through an application on a subject-specific cranial model for simulation of a cochlear implant. Operations required for the full workflow include: data acquisition, image registration and segmentation, material property assignment, numerical analysis, and visualisation. The case study described uses MRI imaging and diffusion tensor MRI for definition of the analysis domain and material properties with analysis conducted in ANSYS. Image registration and segmentation were accomplished using custom designed algorithms. Visualisation was achieved using a 24-bit red-green-blue colour scheme to represent directional vectors.
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