The fast numerical method based on compressive sensing (CS) technology is introduced to calculate the electromagnetic (EM) scattering from a perfectly electrical conducting (PEC) rough surface. A new incident source w...
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ISBN:
(纸本)9781509060948
The fast numerical method based on compressive sensing (CS) technology is introduced to calculate the electromagnetic (EM) scattering from a perfectly electrical conducting (PEC) rough surface. A new incident source with lower dimension is firstly obtained by employing the product of the measurement matrix and the voltage vector of the traditional method of moment (MOM). And then the measurements of the induced current vector are computed by solving the integral equation under the new incident source. Finally, the original induced currents on the rough surface are recovered by the Stagewise orthogonal matching Pursuit (StOMP) algorithm. Hence, the new method can greatly reduce the number of unknowns of the full MOM analysis. Good agreements between the CS and the exact results obtained by the MOM are exhibited. And the CS technology costs less time than the MOM.
Using classical electrodynamics, a theoretical analysis of second and third harmonic generation (SHG and THG) by spherical metal clusters is presented. Based on the anharmonic oscillator model for the displacement of ...
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ISBN:
(纸本)9781509060948
Using classical electrodynamics, a theoretical analysis of second and third harmonic generation (SHG and THG) by spherical metal clusters is presented. Based on the anharmonic oscillator model for the displacement of the surface charge, the sources of the radiation generated in second and third harmonic are determined by using the approximation of the second and third power of the linear surface charge. Then the higher harmonic electric fields are determined by matching the electric fields inside and outside the sphere. Angular dependence of the intensities and the degree of polarization are studied. Detailed results of the SHG and THG are presented. The particle size sensitivity of Mie-scattering is increased by nonlinearity.
DTNs overcome the problems associated with intermittent connectivity, long or variable delay, asymmetric data rates, and high error rates by using store-carry-forward message switching. In DTNs, a node is an entity wi...
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DTNs overcome the problems associated with intermittent connectivity, long or variable delay, asymmetric data rates, and high error rates by using store-carry-forward message switching. In DTNs, a node is an entity with a bundle layer. A node may be a host, router, or gateway(or some combination)acting as a source, destination, or forwarder of bundles. In addition, the performance of node shows great differences. However,the previous DTN routings show blindly and randomly, which do not measure the performance of node when they forward messages. To deal with this issue, we present the concept of Node Connection Intensity(NCI) and Node Connection Stability(NCS), then propose a routing scheme based on Spray-and-Wait and Connecting-Capability of Node(SW-CCN), which evaluate relay node's forward capability synthetically according to the NCI and the NCS. The SW-CCN routing can allocate message replications dynamically and solve the problem of selecting the relay node blindly. Compared with the classical routing protocols, the simulation results show that the proposed algorithm can significantly enhance delivery rate and improve network performance.
Using a quantum-corrected model, the optical cross section of a strongly coupled metallic nanowire dimer for variable separation widths of the junction between the nanowires is analysed by finite-different time-domain...
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ISBN:
(纸本)9781509060948
Using a quantum-corrected model, the optical cross section of a strongly coupled metallic nanowire dimer for variable separation widths of the junction between the nanowires is analysed by finite-different time-domain method. Numerical results show the classical electrodynamics fails to describe the coupling across sub-nanometer gaps, owing to non-local screening and the spill-out of electrons, where quantum effects become important. The quantum-corrected model approach models the junction between adjacent nanoparticles by means of a local dielectric response that includes electron tunnelling and tunnelling resistivity at the gap. The quantum-corrected model predicts optical properties in excellent agreement with fully quantum mechanical calculations for small interacting systems, opening a new venue for addressing quantum effects in realistic plasmonic systems.
In order to calculate the lost phase from the intensity information effectively,a new method of phase retrieval which based on cosine grating modulation and transport of intensity equation is proposed
In order to calculate the lost phase from the intensity information effectively,a new method of phase retrieval which based on cosine grating modulation and transport of intensity equation is proposed
To fast calculate the backscattering coefficient from a one-dimensional rough surface over a frequency band, the asymptotic waveform evaluation (AWE) technique is introduced in this paper. The tapered plane wave is ch...
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ISBN:
(纸本)9781509060948
To fast calculate the backscattering coefficient from a one-dimensional rough surface over a frequency band, the asymptotic waveform evaluation (AWE) technique is introduced in this paper. The tapered plane wave is chosen as the incident wave to avoid the artificial edge diffraction due to the finite length of the simulated rough surface. The Pierson-Moskowitz (PM) spectrum ocean rough surface is applied to simulate the realistic rough surface. Good agreements between the AWE and the exact results obtained by the method of moment (MoM) are exhibited. And the AWE is more effective in computing time over a frequency band.
A new compact 30 : 1 bandwidth ratio balun and its application to balanced antennas are presented in this paper. To realize the balun-type function, two different types of wideband transition structures are adopted fo...
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The optical properties of nanostructures with nonlocal effects is analysied by the finite element method method. The nonlocal effects can be described by a spatially nonlocal dielectric function with Drude model plus ...
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ISBN:
(纸本)9781509060948
The optical properties of nanostructures with nonlocal effects is analysied by the finite element method method. The nonlocal effects can be described by a spatially nonlocal dielectric function with Drude model plus two Lorentz pole oscillator dielectric model. The optical properties of Au nanotubes with different radii, distance of junctions, can be determined by tuning the corresponding parameters to obtain the remarkable nonlocal effects, which should be taken into consideration in real optical device design. Our results can be used as a reference in design of realistic sub-wavelength devices.
Large-scale service composition has become an important research topic in Service-Oriented computing（SOC）. Quality of Service（Qo S） has been mostly applied to represent nonfunctional properties of web services and...
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Large-scale service composition has become an important research topic in Service-Oriented computing（SOC）. Quality of Service（Qo S） has been mostly applied to represent nonfunctional properties of web services and to differentiate those with the same functionality. Many studies for measuring service composition in terms of Qo S have been completed. Among current popular optimization methods for service composition, the exhaustion method has some disadvantages such as requiring a large number of calculations and poor scalability. Similarly,the traditional evolutionary computation method has defects such as exhibiting slow convergence speed and falling easily into the local optimum. In order to solve these problems, an improved optimization algorithm, WS FOA（Web Service composition based on Fruit Fly Optimization Algorithm） for service composition, was proposed, on the basis of the modeling of service composition and the FOA. Simulated experiments demonstrated that the algorithm is effective, feasible, stable, and possesses good global searching ability.
In the era of big data, data intensive applications have posed new challenges to the field of service composition. How to select the optimal composited service from thousands of functionally equivalent services but di...
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In the era of big data, data intensive applications have posed new challenges to the field of service composition. How to select the optimal composited service from thousands of functionally equivalent services but different Quality of Service(Qo S) attributes has become a hot research in service computing. As a consequence,in this paper, we propose a novel algorithm MR-IDPSO(Map Reduce based on Improved Discrete Particle Swarm Optimization), which makes use of the improved discrete Particle Swarm Optimization(PSO) with the Map Reduce to solve large-scale dynamic service composition. Experiments show that our algorithm outperforms the parallel genetic algorithm in terms of solution quality and is efficient for large-scale dynamic service composition. In addition,the experimental results also demonstrate that the performance of MR-IDPSO becomes more better with increasing number of candidate services.
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