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Electrical and Computer Engineering Faculty Research & Creative Works
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- Electric Utilities (3)
- Calderón preconditioner (2)
- Cascading Tripping (2)
- Fabry-Perot interferometers (2)
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- Interferometry (2)
- Layered medium Green's function (2)
- Leaky-wave antenna (2)
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- Antenna array (1)
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- Balanced transmission line (1)
- Balloons (1)
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Articles 1 - 30 of 58
Full-Text Articles in Engineering
Vehicle Base Station, Emad William Saad, John L. Vian, Matthew A. Vavrina, Jared A. Nisbett, Donald C. Wunsch
Vehicle Base Station, Emad William Saad, John L. Vian, Matthew A. Vavrina, Jared A. Nisbett, Donald C. Wunsch
Electrical and Computer Engineering Faculty Research & Creative Works
A system to load and unload material from a vehicle comprises a vehicle base station and an assembly to autonomously load and unload material from the vehicle.
Distributive Radiation Characterization Based On The Peec Method, Ying S. Cao, Li (Lijun) Jun Jiang, Albert E. Ruehli
Distributive Radiation Characterization Based On The Peec Method, Ying S. Cao, Li (Lijun) Jun Jiang, Albert E. Ruehli
Electrical and Computer Engineering Faculty Research & Creative Works
The intentional and unintentional radiations are of great importance to wireless power transfer at the low frequency regime and antenna signal transportation at the higher frequency regime. Due to the rising speed of digital systems and thereby broad bandwidth of signal channels at all levels of electronic devices, it becomes more essential than ever to quantitively analyze, model, and illustrate how the energy is leaked out and which part is a greater contributor to the wanted or unwanted radiation.
A New Approach For Efficient Analysis Of Large Finite Periodic Structures, Xiaoyan Y.Z. Xiong, Ling Ling Meng, Li (Lijun) Jun Jiang, Wei E.I. Sha, Fan Yang
A New Approach For Efficient Analysis Of Large Finite Periodic Structures, Xiaoyan Y.Z. Xiong, Ling Ling Meng, Li (Lijun) Jun Jiang, Wei E.I. Sha, Fan Yang
Electrical and Computer Engineering Faculty Research & Creative Works
Periodic structures have attracted much attention in the past decades due to numerous applications such as metamaterials, antenna arrays, frequency selective surface (FSS), photonic band gap (PBG) or electromagnetic band gap (EBG) structures, etc. Infinite periodic structures are impossible in a realistic fabrication. When truncating infinite periodic structures, discontinuities occur at the interface and surface waves will be excited according to mode conversion, which leads to the edge effect of finite periodic structures. The prediction of wave natures in the edge cells of finite periodic structures is an indispensable procedure during the design of finite periodic structures. The conventional element-by-element …
Predicting Solar Irradiance Using Time Series Neural Networks, Ahmad Alzahrani, Jonathan W. Kimball, Cihan H. Dagli
Predicting Solar Irradiance Using Time Series Neural Networks, Ahmad Alzahrani, Jonathan W. Kimball, Cihan H. Dagli
Electrical and Computer Engineering Faculty Research & Creative Works
Increasing the accuracy of prediction improves the performance of photovoltaic systems and alleviates the effects of intermittence on the systems stability. A Nonlinear Autoregressive Network with Exogenous Inputs (NARX) approach was applied to the Vichy-Rolla National Airport's photovoltaic station. The proposed model uses several inputs (e.g. time, day of the year, sky cover, pressure, and wind speed) to predict hourly solar irradiance. Data obtained from the National Solar Radiation Database (NSRDB) was used to conduct simulation experiments. These simulations validate the use of the proposed model for short-term predictions. Results show that the NARX neural network notably outperformed the other …
Calderón Preconditioned Pmchwt Equations For Analyzing Penetrable Objects In Layered Medium, Yongpin P. Chen, Lijun Jiang, Sheng Sun, Weng Cho Chew, Jun Hu
Calderón Preconditioned Pmchwt Equations For Analyzing Penetrable Objects In Layered Medium, Yongpin P. Chen, Lijun Jiang, Sheng Sun, Weng Cho Chew, Jun Hu
Electrical and Computer Engineering Faculty Research & Creative Works
We study Calderón preconditioners for analyzing electromagnetic scattering by penetrable objects in a layered medium. To account for the scattering effects of the multilayered background, the layered medium Green's function is adopted in the Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) method. However, similar to the free-space case, the spectrum of the resulting equation is undesirable. This leads to a slow convergence of an iterative solver, especially when the geometry is densely meshed. To improve the convergence, a highly effective preconditioner is proposed. Different from its free-space counterpart, the preconditioning operator is constructed based on the Calderón identities for inhomogeneous medium. To reduce the relatively …
An Adaptive Hierarchical Sparse Grid Collocation Method For Stochastic Scattering Systems Analysis, Ping Li, Li (Lijun) Jun Jiang
An Adaptive Hierarchical Sparse Grid Collocation Method For Stochastic Scattering Systems Analysis, Ping Li, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
To quantify the impacts of random inputs on hybrid electromagnetics (EM)-circuit systems or EM scattering from objects, an adaptive hierarchical sparse grid collocation (ASGC) algorithm combined with discontinuous Galerkin time-domain (DGTD) method is presented in this work. As a stochastic polynomial chaos modality, the ASGC method approximates the interested stochastic observables using interpolation functions over a set of collocation points. Instead of employing a full-tensor product sense, the collocation points in ASGC method are hierarchically marched with interpolation level based on Smolyak's algorithm. To further reduce the collocation points, the hierarchical surplus is used as the error indicator for each …
Beam-Switchable Magneto-Electric Antenna Array Based On Composite Right/Left-Handed (Crlh) Structures, Shulabh Gupta, Li (Lijun) Jun Jiang
Beam-Switchable Magneto-Electric Antenna Array Based On Composite Right/Left-Handed (Crlh) Structures, Shulabh Gupta, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
The beam-switching characteristics of Magneto-Electric (ME) dipole antenna array is presented based on differentially exciting the two ports of the array with different polarities. The proposed principle is demonstrated using full-wave simulations that the depending on the polarity of the two excitations, either a magnetic-dipole or an electric-dipole radiation can be selectively achieved.
Generalized Natural Mode Expansion For Arbitrary Electromagnetic Fields, Q. I. Dai, W. C. Chew, L. (Lijun) J. Jiang
Generalized Natural Mode Expansion For Arbitrary Electromagnetic Fields, Q. I. Dai, W. C. Chew, L. (Lijun) J. Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A generalized natural mode expansion theory for investigating arbitrary electromagnetic fields is presented. When an inhomogeneity is bounded with impenetrable boundaries, the field excited by arbitrary sources is expanded with a complete set of eigenmodes, which are classified into trapped modes and exterior modes. As the boundaries tend to infinity, trapped modes remain unchanged, while exterior modes form a continuum. In numerical studies, unbounded systems can be emulated by placing perfectly matched layers (PMLs) at finite extent. Simulation shows that only a few natural modes are prominent in expanding the excited field in a properly functioning device. Such a reduced …
Improved Field Projection In Equivalence Principle Algorithm With Rotated Cwbc Basis, Zu Hui Ma, Sheng Sun, Lijun Jiang, Weng Cho Chew, Mao Kun Li
Improved Field Projection In Equivalence Principle Algorithm With Rotated Cwbc Basis, Zu Hui Ma, Sheng Sun, Lijun Jiang, Weng Cho Chew, Mao Kun Li
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, a dual-basis testing method is utilized to enhance the field projection in the equivalence principle algorithm (EPA). Due to the presence of identity operators in the EPA formulation, the near-field calculation is less accurate with field projection errors. This issue can be effectively remedied by using the recently proposed dual-basis function of Rao-Wilton-Glisson basis function, named as rotated Chen-Wilton-Buffa-Christiansen basis function. Numerical result shows the validity of the proposed method.
Calderón Preconditioned Pmchwt Equation For Layered Medium Problems, Yongpin P. Chen, Lijun Jiang, Sheng Sun, Weng Cho Chew
Calderón Preconditioned Pmchwt Equation For Layered Medium Problems, Yongpin P. Chen, Lijun Jiang, Sheng Sun, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
Electromagnetic scattering by dielectric objects in the presence of a layered medium is investigated by applying the Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) equation combined with the layered medium Green's function. Due to the electric field integral equation (EFIE) operator involved, the spectrum of the PMCHWT equation is also undesired. When the surface is densely discretized, the condition of the resulting matrix is extremely bad. An effective Calderón preconditioner is developed in this paper to improve the convergence. Different from its free space counterpart, the Calderón identities for inhomogeneous medium need to be re-derived. It is shown from numerical examples that the convergence of …
Second-Harmonic Generation In Metal Nanoparticles Modeling By Surface Integral Equation, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Yat Hei Lo, Weng Cho Chew
Second-Harmonic Generation In Metal Nanoparticles Modeling By Surface Integral Equation, Xiaoyan Y.Z. Xiong, Li (Lijun) Jun Jiang, Yat Hei Lo, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
Metals are centrosymmetric materials which only posse local surface second-harmonic (SH) nonlinearities due to the symmetry broken at the surface. In this work the surface integral equation (SIE) is used for evaluating SH radiation generated from metal nanoparticles with arbitrary shapes. The whole SIE system is solved by employing the Galerkin testing procedure and Rao-Wilton-Gillson (RWG) basis functions. The mutual coupling between fundamental and second harmonic field is captured. The method is validated by comparisons with the analytic SH-Mie solution. This method paves the way for accurate and efficient design of general SH nonlinear nanoplasmonic structures.
Applying Cem Techniques To Solve Nano-Scale Quantum Transport Problems, Jun Z. Huang, Weng Cho Chew, Li (Lijun) Jun Jiang
Applying Cem Techniques To Solve Nano-Scale Quantum Transport Problems, Jun Z. Huang, Weng Cho Chew, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Two widely used algorithms in computational electromagnetics (CEM) society, namely the asymptotic waveform evaluation (AWE) technique and the model order reduction (MOR) mode matching method, are employed to calculate electron wave propagation in novel nanoelectronic devices.
An Ibc Enhanced Dgtd Scheme For Transient Analysis Of Em Interactions With Graphene, Ping Li, Li (Lijun) Jun Jiang, Hakan Baʇci
An Ibc Enhanced Dgtd Scheme For Transient Analysis Of Em Interactions With Graphene, Ping Li, Li (Lijun) Jun Jiang, Hakan Baʇci
Electrical and Computer Engineering Faculty Research & Creative Works
A discontinuous Galerkin time-domain (DGTD) method is proposed for analyzing electromagnetic field interactions on graphene from microwave to terahertz frequencies. An impedance boundary condition (IBC) is utilized to model the graphene within the DGTD framework. The numerical flux is reformulated to take into account the IBC. Highly dispersive surface conductivity of graphene present in the resulting flux expression is approximated in terms of rational functions using the fast-relaxation vector-fitting technique. Via inverse Laplace transform, this facilitates the time domain matrix equations into an integral form for time variable t, finite integral technique (FIT) with recursive convolution method is employed to …
Analysis Of Scattering By Pec Objects In Layered Medium With Calderón Preconditioner, Yongpin P. Chen, Min Meng, Sheng Sun, Lijun Jiang, Weng Cho Chew
Analysis Of Scattering By Pec Objects In Layered Medium With Calderón Preconditioner, Yongpin P. Chen, Min Meng, Sheng Sun, Lijun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
Electromagnetic scattering by perfect electrically conducting (PEC) objects in a layered medium is studied in this paper. The layered medium Green's function is adopted as the kernel of the electric field integral equation (EFIE) so that the effects from the multilayered background can be accounted for automatically. However, the spectrum of the EFIE with this kernel, is unfortunately undesirable. This leads to slow convergence of the iterative solution. To improve the convergence, the Calderón identities are derived and leveraged to precondition the EFIE. By utilizing Buffa-Christiansen (BC) basis function in discretizing the preconditioning operator, the preconditioner can be made completely …
Differential Forms Inspired Finite Element Discretization For Waveguide Eigenvalue Problems, Qi I. Dai, Weng Cho Chew, Lijun Jiang
Differential Forms Inspired Finite Element Discretization For Waveguide Eigenvalue Problems, Qi I. Dai, Weng Cho Chew, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A differential forms inspired finite element based discretization scheme for waveguide eigenvalue problems is presented. Naïve discretization of the governing variational expression involving only transverse fields with edge elements renders the discretized eigen-equation unsolvable. Motivated by differential forms, in the proposed scheme, electric and magnetic fields are discretized with curl-conforming basis functions on the primal and dual grids, respectively. Meanwhile, magnetic flux density and electric displacement fields are discretized with divergence-conforming basis functions on the primal and dual grids, respectively. Matrices in the resultant eigen-equation is well-conditioned and easy to solve, which is validated by several numerical examples.
The Contour Deformation Method For Calculating The High Frequency Scattered Fields By The Fock Current On The Surface Of The 3-D Convex Cylinder, Yu Mao Wu, Li (Lijun) Jun Jiang, Weng Cho Chew
The Contour Deformation Method For Calculating The High Frequency Scattered Fields By The Fock Current On The Surface Of The 3-D Convex Cylinder, Yu Mao Wu, Li (Lijun) Jun Jiang, Weng Cho Chew
Electrical and Computer Engineering Faculty Research & Creative Works
In this work, the Fock currents on the convex cylinders are comprehensively studied. The contour deformation method is invoked to calculate the highly oscillatory Fock currents. The computational process is frequency independent in workload. Then, quadratic phase approximation is proposed to efficiently solve the highly oscillatory scattered field. Numerical results for the high frequency scattered far fields on the convex cylinders are given to validate the efficiency of the proposed method. Furthermore, the contour deformation method for computing the Fock currents offers a clear high frequency wave physical picture.
Linearly Polarized Near Field Focused Slot-Array Waveguide, Meng Lin Chen, Shulabh Gupta, Zi Long Ma, Li (Lijun) Jun Jiang
Linearly Polarized Near Field Focused Slot-Array Waveguide, Meng Lin Chen, Shulabh Gupta, Zi Long Ma, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A 2-D slot array structure to achieve near-field beam focusing, with a linear polarization, is proposed and demonstrated using full-wave simulations. The proposed structure has a negligible cross-polarization and its far-field gain is lower by 10 dB compared to the non-focus case, indicating a good focusing in the near-field of the structure.
Augmented Equivalence Principle Algorithm For Domain Decomposition Method For Low Frequency Scattering, Circuits, And Casimir Force Calculations, P. R. Atkins, Z. H. Ma, L. E. Sun, M. K. Li, L. (Lijun) J. Jiang, M. S. Tong, W. C. Chew
Augmented Equivalence Principle Algorithm For Domain Decomposition Method For Low Frequency Scattering, Circuits, And Casimir Force Calculations, P. R. Atkins, Z. H. Ma, L. E. Sun, M. K. Li, L. (Lijun) J. Jiang, M. S. Tong, W. C. Chew
Electrical and Computer Engineering Faculty Research & Creative Works
A broadband integral-equation-based domain decomposition method (DDM) using augmented equivalence principle algorithm (A-EPA) is introduced for solving large scale electromagnetic scattering, circuits, and Casimir force problems. The root cause of the low frequency breakdown problem of EPA algorithm without augmentation technique is analyzed. Numerical examples validate the method for various applications in scattering, circuits, and Casimir force calculations.
Reduced-Permittivity Meandered Single-Beam Full-Space Scanning Phase-Reversal Leaky-Wave Antenna, Shulabh Gupta, Li (Lijun) Jun Jiang, Christophe Caloz
Reduced-Permittivity Meandered Single-Beam Full-Space Scanning Phase-Reversal Leaky-Wave Antenna, Shulabh Gupta, Li (Lijun) Jun Jiang, Christophe Caloz
Electrical and Computer Engineering Faculty Research & Creative Works
A meandered version of the phase-reversal leaky-wave antenna is introduced to reduce the permittivity requirement εeff > 4 for single-beam full-space scanning.
A Discontinuous Galerkin Time Domain-Boundary Integral Method For Analyzing Transient Electromagnetic Scattering, Ping Li, Li (Lijun) Jun Jiang, Yifei Shi, Hakan Bagci
A Discontinuous Galerkin Time Domain-Boundary Integral Method For Analyzing Transient Electromagnetic Scattering, Ping Li, Li (Lijun) Jun Jiang, Yifei Shi, Hakan Bagci
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents an algorithm hybridizing discontinuous Galerkin time domain (DGTD) method and time domain boundary integral (BI) algorithm for 3-D open region electromagnetic scattering analysis. The computational domain of DGTD is rigorously truncated by analytically evaluating the incoming numerical flux from the outside of the truncation boundary through BI method based on the Huygens' principle. The advantages of the proposed method are that it allows the truncation boundary to be conformal to arbitrary (convex/ concave) scattering objects, well-separated scatters can be truncated by their local meshes without losing the physics (such as coupling/multiple scattering) of the problem, thus reducing …
Effective Roughness Dielectric In A Pcb: Measurement And Full-Wave Simulation Verification, Tracey Vincent, Marina Koledintseva, Antonio Ciccomancini, Scott Hinaga
Effective Roughness Dielectric In A Pcb: Measurement And Full-Wave Simulation Verification, Tracey Vincent, Marina Koledintseva, Antonio Ciccomancini, Scott Hinaga
Electrical and Computer Engineering Faculty Research & Creative Works
Surface roughness topography of printed circuit boards (PCBs) needs to be included in SI simulations in order to accurately predict the insertion loss of the structure. An effective roughness dielectric (ERD) model can be used to substitute an inhomogeneous interface between copper foil and laminate dielectric in a PCB. Herein, this approach is tested for verification using 3D full-wave numerical simulations. These effective roughness dielectric layers with the appropriate complex permittivity are included in the modeling of strip line examples. The parameters of an ambient laminate dielectric free of conductor roughness effects in the strip line are determined using differential …
Uncertainty Quantification Of Em-Circuit Systems Using Stochastic Polynomial Chaos Method, Ping Li, Li (Lijun) Jun Jiang
Uncertainty Quantification Of Em-Circuit Systems Using Stochastic Polynomial Chaos Method, Ping Li, Li (Lijun) Jun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Uncertainties in realistic lumped and distributive circuit systems are of great importance to today's high yield manufacture demand. However, evaluating the stochastic effect in the time domain for the hybrid electromagnetics (EM)-circuit system was seldom done, especially when Monte Carlo is too expensive to be feasible. In this work, an adaptive hierarchical sparse grid collocation (ASGC) method is presented to quantify the impacts of stochastic inputs on hybrid electromagnetics (EM)-circuit or EM scattering systems. The ASGC method approximates the stochastic observables of interest using interpolation functions over series collocation points. Instead of employing a full-tensor product sense, the collocation points …
First Demonstration Of Ultra-Thin Sige-Channel Junctionless Accumulation-Mode (Jam) Bulk Finfets On Si Substrate With Pn Junction-Isolation Scheme, Donghyun Kim, Tae Kyun Kim, Young Gwang Yoon, Byeong Woon Hwang, Yang-Kyu Choi, Byung Jin Cho, Seok-Hee Lee
First Demonstration Of Ultra-Thin Sige-Channel Junctionless Accumulation-Mode (Jam) Bulk Finfets On Si Substrate With Pn Junction-Isolation Scheme, Donghyun Kim, Tae Kyun Kim, Young Gwang Yoon, Byeong Woon Hwang, Yang-Kyu Choi, Byung Jin Cho, Seok-Hee Lee
Electrical and Computer Engineering Faculty Research & Creative Works
A SiGe-channel junctionless-accumulation-mode (JAM) PMOS bulk FinFETs were successfully demonstrated on Si substrate with PN junction-isolation scheme for the first time. The JAM bulk FinFETs with fin width of 18 nm exhibits excellent subthreshold characteristics such as subthreshold swing of 64 mV/decade, drain-induced barrier lowering (DIBL) of 40 mV/V and high Ion/Ioff current ratio ( > 1 x 105). The change of substrate bias from 0 to 5 V leads to the threshold voltage shift of 53 mV by modulating the effective channel thickness. When compared to the Si-channel bulk FinFETs with fin width of 18 …
Integration Of Microwave And Thermographic Ndt Methods For Corrosion Detection, Dustin F. Pieper, Kristen M. Donnell, Mohammad Tayeb Ahmad Ghasr, Edward C. Kinzel
Integration Of Microwave And Thermographic Ndt Methods For Corrosion Detection, Dustin F. Pieper, Kristen M. Donnell, Mohammad Tayeb Ahmad Ghasr, Edward C. Kinzel
Electrical and Computer Engineering Faculty Research & Creative Works
Infrastructure health monitoring is an important issue in the transportation industry. For the case of cement-based structures in particular, detection of corrosion on reinforcing steel bars (rebar) is an ongoing problem for aging infrastructure. There have been a number of techniques that have shown promise in this area including microwave nondestructive testing (NDT) and thermography. Thermography is quite advantageous as it is an established method, and can be utilized for large inspection areas with intuitive results. Typical heat sources include induction heating and flash lamps, but these are not without drawbacks. Microwave nondestructive testing has also been successful at detecting …
Spatially Continuous Distributed Fiber Optic Sensing Using Optical Carrier Based Microwave Interferometry, Jie Huang, Xinwei Lan, Ming Luo, Hai Xiao
Spatially Continuous Distributed Fiber Optic Sensing Using Optical Carrier Based Microwave Interferometry, Jie Huang, Xinwei Lan, Ming Luo, Hai Xiao
Electrical and Computer Engineering Faculty Research & Creative Works
This paper reports a spatially continuous distributed fiber optic sensing technique using optical carrier based microwave interferometry (OCMI), in which many optical interferometers with the same or different optical path differences are interrogated in the microwave domain and their locations can be unambiguously determined. The concept is demonstrated using cascaded weak optical reflectors along a single optical fiber, where any two arbitrary reflectors are paired to define a low-finesse Fabry-Perot interferometer. While spatially continuous (i.e., no dark zone), fully distributed strain measurement was used as an example to demonstrate the capability, the proposed concept may also be implemented on other …
Asynchronous Advanced Encryption Standard Hardware With Random Noise Injection For Improved Side-Channel Attack Resistance, Siva Pavan Kumar Kotipalli, Yong-Bin Kim, Minsu Choi
Asynchronous Advanced Encryption Standard Hardware With Random Noise Injection For Improved Side-Channel Attack Resistance, Siva Pavan Kumar Kotipalli, Yong-Bin Kim, Minsu Choi
Electrical and Computer Engineering Faculty Research & Creative Works
This work presents the design, hardware implementation, and performance analysis of novel asynchronous AES (advanced encryption standard) Key Expander and Round Function, which offer increased side-channel attack (SCA) resistance. These designs are based on a delay-insensitive (DI) logic paradigm known as null convention logic (NCL), which supports useful properties for resisting SCAs including dual-rail encoding, clock-free operation, and monotonic transitions. Potential benefits include reduced and more uniform switching activities and reduced signal-to-noise (SNR) ratio. A novel method to further augment NCL AES hardware with random voltage scaling technique is also presented for additional security. Thereby, the proposed components leak significantly …
Magnetics In Smart Grid, Qi Huang, Yuanqiang Song, Xu Sun, Lijun Jiang, Philip W.T. Pong
Magnetics In Smart Grid, Qi Huang, Yuanqiang Song, Xu Sun, Lijun Jiang, Philip W.T. Pong
Electrical and Computer Engineering Faculty Research & Creative Works
A revolution in power transmission and distribution, driven by environmental and economic considerations, is occurring all over the world. This revolution is spearheaded by the development of the smart grid. The smart grid is bringing profound change to both the power systems and many related industries. This paper reviews the development of the smart grid and its correlation with magnetics, including electromagnetic compatibility issue, magnetic-field-based measurement/monitoring, and magnetic energy storage/conversion. The challenge to the field of magnetics and the usage of the cutting edge magnetics technology in the development of the smart grid are discussed. This paper enables researchers in …
Injection Locking Of Spin-Torque Nano-Oscillators, Chong Long Cao, Yan Zhou, Lijun Jiang, Philip W.T. Pong
Injection Locking Of Spin-Torque Nano-Oscillators, Chong Long Cao, Yan Zhou, Lijun Jiang, Philip W.T. Pong
Electrical and Computer Engineering Faculty Research & Creative Works
We demonstrated the phase locking of a spin-torque oscillator (STO) to an alternating current (ac) using macrospin and micromagnetic simulations. We found that the locking properties of both approaches agree with each other. The phase difference between the STO and the injected ac stabilizes at Δφ ≈ 90° and is not sensitive to the initial phase difference, which provides potential application of STO for microwave generation.
Comparison Of Synthetic Aperture Radar And Impact-Echo Imaging For Detecting Delamination In Concrete, John S. Popovics, Suyun Ham, Mohammad Tayeb Ahmad Ghasr, R. Zoughi
Comparison Of Synthetic Aperture Radar And Impact-Echo Imaging For Detecting Delamination In Concrete, John S. Popovics, Suyun Ham, Mohammad Tayeb Ahmad Ghasr, R. Zoughi
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper we evaluate the utility of microwave and mechanical wave nondestructive testing techniques to detect delamination in reinforced concrete bridge deck mock-up samples. The mechanical wave tests comprise air-coupled impact-echo measurements, while the microwave measurements comprise three-dimensional synthetic aperture radar imaging using wideband reflectometery in the frequency range of 1-4 GHz. The results of these investigations are presented in terms of images that are generated from these data. Based on a comparison of the results, we show that the two methods are complementary, in that provide distinct capabilities for defect detection. More specifically, the former approach is unable …
Organizing A Student Poster Session In An Asee Section Conference, Steve Eugene Watkins, Les Kinsler, Julia L. Morse, Douglas R. Carroll
Organizing A Student Poster Session In An Asee Section Conference, Steve Eugene Watkins, Les Kinsler, Julia L. Morse, Douglas R. Carroll
Electrical and Computer Engineering Faculty Research & Creative Works
Student poster sessions at conferences can be valuable experiences for undergraduate and graduate students and can enrich the conference program for all participants. Student poster presentations beyond the local campus can provide additional experience in professional communication (especially in preparing succinct abstracts and in effective visual design), can prepare students for future conference participations, and can facilitate student-faculty interaction. Several issues exist when including student poster sessions in engineering education conferences. How can the content of posters be related to an engineering education theme? How are communication principles of audience and purpose incorporated into the session guidelines and review process? …