Browsing by Keywords "Conductivity"
Now showing items 1-16 of 16
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bSSFP phase correction and its use in magnetic resonance electrical properties tomography
(International Society for Magnetic Resonance in Medicine, 2019)Purpose Balanced steady‐state free precession (bSSFP) sequence is widely used because of its high SNR and high speed. However, bSSFP images suffer from “banding artifact” caused by B0 inhomogeneity. In this article, we ... -
Does the donor-acceptor concept work for designing synthetic metals? III. theoretical investigation of copolymers between quinoid acceptors and aromatic donors
(2006)Homopolymers of quinoxaline (QX), benzothiadiazole (BT), benzobisthiadiazole (BBT), thienopyrazine (TP), thienothiadiazole (TT), and thienopyrazinothiadiazole (TTP) and copolymers of these acceptors with thiophene (TH) and ... -
Electronic structure analysis of a new quinoid conjugated polymer
(Springer, 2000)The low lying unoccupied orbitals of oligomers of 4-dicyanomethylene-4H-cyclopenta[2,1-b:3,4-b'] dithiophene (CDM) are not delocalized over the whole molecule. Is such electron localization in the conduction band of poly-CDM ... -
Electrospinning of uniform nanofibers of polymers of intrinsic microporosity (PIM-1): the influence of solution conductivity and relative humidity
(Elsevier, 2019)Polymers of Intrinsic Microporosity (PIMs) are ultra-permeable macromolecules, which can be cast as a dense membrane and exploited in a wide spectrum of applications, particularly for gas separation owing to their extremely ... -
Fabrication of supramolecular n/p-nanowires via coassembly of oppositely charged peptide-chromophore systems in aqueous media
(American Chemical Society, 2017-07)Fabrication of supramolecular electroactive materials at the nanoscale with well-defined size, shape, composition, and organization in aqueous medium is a current challenge. Herein we report construction of supramolecular ... -
Feasibility of conductivity imaging using subject eddy currents induced by switching of MRI gradients
(John Wiley and Sons Inc., 2017)Purpose: To investigate the feasibility of low-frequency conductivity imaging based on measuring the magnetic field due to subject eddy currents induced by switching of MRI z-gradients. Methods: We developed a simulation ... -
Gradient-based electrical conductivity imaging using MR phase
(John Wiley and Sons Inc., 2017)Purpose: To develop a fast, practically applicable, and boundary artifact free electrical conductivity imaging method that does not use transceive phase assumption, and that is more robust against the noise. Theory: Starting ... -
Improvement and comparison of complex B₁ mapping techniques for use in MREPT
(Bilkent University, 2018-09)Impedance imaging, (i.e., conductivity, , and permittivity, ) provides helpful information about contrast between healthy and malignant tissues. As one of the impedance imaging techniques, Magnetic Resonance Electrical ... -
Investigation of the effect of donor-acceptor substitution on band gap, band width, and conductivity
(Elsevier, 2001)Polymers of two donor-acceptor systems, 3-cyano,3′-hydroxybithiophene 1 and 4-dicyanomethylene-4H-cyclopenta[2,1-b:3,4-b′],3,4-ethylenedioxythiophene (CDM-EDOT) 2, were analyzed with density functional theory. As predicted ... -
Iterative fitting approach to CR-MREPT
(Bilkent University, 2019-06)Electrical properties (conductivity, and permittivity, ) imaging, reveals information about the contrast between tissues. Magnetic Resonance Electrical Properties Tomography (MREPT) is one of the electrical properties ... -
Modelling a resistive-reflector antenna by the complex source-dual series approach: the 2-D case of H-polarization
(IEEE, 1995)The simulation of reflector antenna is normally conducted under an assumption of the perfect conductivity of reflector. This paper presents an analysis of resistive reflector beamforming using modified method of regularization ... -
Modulation behaviors, conductivities, and carrier dynamics of single and multilayer graphenes
(IEEE Computer Society, 2019)Time domain and time resolved terahertz studies of single- and multi-layer graphene (SLG and MLG) samples and modulator devices will be presented. A high performance up to 100% of modulators were observed with the devices ... -
Numerically exact analysis of a two-dimensional variable-resistivity reflector fed by a complex-point source
(Institute of Electrical and Electronics Engineers, 1997-11)Accurate numerical analysis of a two-dimensional (2-D) variable-resistivity reflector has been carried out by the method of regularization based on the analytical inversion of the corresponding static problem. The complex ... -
Plasmon-LO-phonon coupling effects on the drag rate in double quantum-well systems
(Elsevier, 1997)We study the Coulomb drag rate for electrons in a double-quantum-well structure taking into account the electron-optical phonon interactions. The full wave vector and frequency dependent random-phase approximation (RPA) ... -
A synthetic biology approach for engineered functional biofilm
(Bilkent University, 2017-12)Extracellular polymeric substances consist of molecules, DNAs, carbohydrates, and proteins that are secreted by microbial biofilms. These molecules assist in the synthesis of bacterial biofilms as highly ordered, complex ... -
Theoretical analysis of poly(difluoroacetylene) PDFA
(Elsevier, 2003)Due to the π-donating ability of fluorine, fluorosubstitution has a remarkable effect on the band structure of polyacetylene (PA). Valence and conduction band edges decrease in energy, leading to narrower valence and wider ...
