Nonlinear wave propagation
159 resources related to Nonlinear wave propagation
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2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting
The joint meeting is intended to provide an international forum for the exchange of information on state of the art research in the area of antennas and propagation, electromagnetic engineering and radio science
The conference program will consist of plenary lectures, symposia, workshops and invitedsessions of the latest significant findings and developments in all the major fields of biomedical engineering.Submitted papers will be peer reviewed. Accepted high quality papers will be presented in oral and postersessions, will appear in the Conference Proceedings and will be indexed in PubMed/MEDLINE
IEEE International Conference on Plasma Science (ICOPS) is an annual conference coordinated by the Plasma Science and Application Committee (PSAC) of the IEEE Nuclear & Plasma Sciences Society.
The IEEE International Microwave Symposium (IMS) is the world s foremost conference covering the UHF, RF, wireless, microwave, millimeter-wave, terahertz, and optical frequencies; encompassing everything from basic technologies to components to systems including the latest RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation and more. The IMS includes technical and interactive sessions, exhibits, student competitions, panels, workshops, tutorials, and networking events.
All fields of satellite, airborne and ground remote sensing.
The IEEE Aerospace and Electronic Systems Magazine publishes articles concerned with the various aspects of systems for space, air, ocean, or ground environments.
Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.
IEEE Antennas and Wireless Propagation Letters (AWP Letters) will be devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation.
Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission
Speech analysis, synthesis, coding speech recognition, speaker recognition, language modeling, speech production and perception, speech enhancement. In audio, transducers, room acoustics, active sound control, human audition, analysis/synthesis/coding of music, and consumer audio. (8) (IEEE Guide for Authors) The scope for the proposed transactions includes SPEECH PROCESSING - Transmission and storage of Speech signals; speech coding; speech enhancement and noise reduction; ...
IEEE Conference Record - Abstracts. 1992 IEEE International Conference on Plasma, 1993
Proceedings of the IEEE 28th Annual Northeast Bioengineering Conference (IEEE Cat. No.02CH37342), 2002
A powerful measurement technique suitable for virtually continuous calibration of ultrasonic hydrophone probes in the frequency range 250 kHz 60 MHz is described and frequency responses of PVDF polymer hydrophones are presented. The validity of the calibration results was examined using independent calibration techniques. The values of sensitivity in V/Pa obtained using a linear swept frequency technique were compared with ...
The 2006 IEEE International Joint Conference on Neural Network Proceedings, 2006
Cellular Nonlinear Networks (CNN) are characterized by local couplings of comparatively simple dynamical systems. In spite their compact structure, CNN exhibit complex phenomena like nonlinear wave propagation or chaotic behavior. The well studied Reaction-Diffusion Systems are widely used to describe phenomena like pattern formation and other processes in the fields of biology, chemistry and physics. By spatial discretization Reaction-Diffusion Partial ...
2000 IEEE Ultrasonics Symposium. Proceedings. An International Symposium (Cat. No.00CH37121), 2000
Second harmonic imaging has become a standard technique to attempt to image the (myocardial) perfusion bed. For optimal image quality, the generation and detection of the energy in the harmonic frequency band has to be optimized. As in the clinical setting the incident and backscattered waves often have to travel through dispersive media (regions containing the agent), the aim of ...
2002 IEEE Ultrasonics Symposium, 2002. Proceedings., 2002
A method for fast simulation of nonlinear wave propagation has been developed. It is based on quasi-linear approximation. By using the angular spectrum method, the contribution from an arbitrarily plane was found by back propagation of the wave field from the focal plane, squaring the field, and forward propagation of the result to the observation plane. In the spatial/time Fourier-domain, ...
Millimeter Wave Mobile Communications for 5G Cellular: It Will Work!
Micro-Apps 2013: Designing an ETSI E-Band Circuit for a MM Wave Wireless System
IMS 2011 Microapps - Beyond the S-Parameter: The Benefits of Nonlinear Device Models
IMS 2011 Microapps - Panel Session: Nonlinear Measurements
Nonlinear Dynamics and Chaos for Flexible, Reconfigurable Computing - IEEE Rebooting Computing 2017
IMS 2011 Microapps - STAN Tool: A New Method for Linear and Nonlinear Stability Analysis of Microwave Circuits
Brooklyn 5G Summit 2014: Modeling the Indoor Radio Propagation with Dr. K Haneda
MicroApps: 200W RF Power Amplifer Design using a Nonlinear Vector Network Analyzer and Measured Load-Dependent X-Parameters (2) (Agilent Technologies)
Nonlinear Material Responses and Their Characterization: An IPC Keynote with Eric Van Stryland
From THz imaging to millimeter-wave stimulation of neurons: Is there a killer application for high frequency RF in the medical community? (RFIC 2015 Keynote)
IMS MicroApps: Nonlinear Co-Simulation with Real-Time Channel Measurements
IMS MicroApp: Unexpected effects of conductor profile on the propagation constant
Microapps: Enabling Optimized Performance and Lower TCO (Total Cost of Ownership) with Infineon mm-Wave Transceiver
Solving Sparse Representation for Image Classification using Quantum D-Wave 2X Machine - IEEE Rebooting Computing 2017
IMS 2014:Active 600GHz Frequency Multiplier-by-Six S-MMICs for Submillimeter-Wave Generation
Envelope Time-Domain Characterizations to Assess In-Band Linearity Performances of Pre-Matched MASMOS Power Amplifier: RFIC Interactive Forum 2017
What's New in Digital Predistortion
IMS 2014:Flip Chip Assembly for Sub-millimeter Wave Amplifier MMIC on Polyimide Substrate
D-Wave Quantum Computer: Technology Update - Fabio Altomare - ICRC San Mateo, 2019
A powerful measurement technique suitable for virtually continuous calibration of ultrasonic hydrophone probes in the frequency range 250 kHz 60 MHz is described and frequency responses of PVDF polymer hydrophones are presented. The validity of the calibration results was examined using independent calibration techniques. The values of sensitivity in V/Pa obtained using a linear swept frequency technique were compared with those which were determined from the measurements employing nonlinear wave propagation. Also, the sensitivity against frequency data obtained here were compared with the data provided by an independent national laboratory. The overall agreement between the calibration results obtained using different techniques mentioned above was within 1 dB at the frequencies up to 25 MHz. The uncertainty increased gradually with increasing frequency and was determined to be 2.5 dB at 60 MHz. A spatial averaging correction model is being developed to minimize this uncertainty. The near continuous frequency plots in the 40-60 MHz bandwidth were not reported so far and reveal that the ultrasonic hydrophone probes response is largely controlled by their design architecture.
Cellular Nonlinear Networks (CNN) are characterized by local couplings of comparatively simple dynamical systems. In spite their compact structure, CNN exhibit complex phenomena like nonlinear wave propagation or chaotic behavior. The well studied Reaction-Diffusion Systems are widely used to describe phenomena like pattern formation and other processes in the fields of biology, chemistry and physics. By spatial discretization Reaction-Diffusion Partial Differential equations can be mapped to the cellular structures of Reaction- Diffusion Cellular Nonlinear Networks (RD-CNN). In this contribution simple RD-CNN models are determined in numerical optimization procedures in order to approximate short segments of EEG signals. Thereby effects of higher order nonlinear cell couplings are studied. Parameter changes of the RD-CNN models may be used for precursor detection of impending seizures in epilepsy.
Second harmonic imaging has become a standard technique to attempt to image the (myocardial) perfusion bed. For optimal image quality, the generation and detection of the energy in the harmonic frequency band has to be optimized. As in the clinical setting the incident and backscattered waves often have to travel through dispersive media (regions containing the agent), the aim of this study was to determine the influence of dispersion on nonlinear wave propagation by means of computer simulation. The simulations showed dispersion to elongate broadband waveforms making them chirp-like. It thus reduces the intrinsic axial resolution of the imaging system. However, it also results in a significant decrease in energy transfer to higher harmonics; more energy remains in the fundamental hand. This effect is shown to be independent of the phase of bandwidth of the pulse. Thus, highly dispersive contrast agents might offer a solution to excessive attenuation, a common problem in ultrasound contrast imaging.
A method for fast simulation of nonlinear wave propagation has been developed. It is based on quasi-linear approximation. By using the angular spectrum method, the contribution from an arbitrarily plane was found by back propagation of the wave field from the focal plane, squaring the field, and forward propagation of the result to the observation plane. In the spatial/time Fourier-domain, propagation is performed by a complex exponential factor, whereas the square operation corresponds to a 3D convolution. It turned out that the integration along the ultrasound beam could be solved analytically. The computation in the Fourier-domain was then reduced to a triple-integral. The resulting second harmonic wave in the observation plane was found by (3D) inverse FFT. A simulation program has been implemented in Matlab, using a laptop PC with 1.2 GHz Pentium III processor. Applied to a phased array transducer the simulation time was less than 5 minutes. The implementation of the algorithm was verified by measurements. We observed satisfactory accordance between simulations and measurements.
Catheterization remains the gold standard for bladder volume assessment, but it is invasive, uncomfortable to the patient, and introduces the risk of infections and trauma. To reduce the need for a urinary catheter, a new method has recently been introduced that non-invasively and instantaneously measures the bladder volume on the basis of nonlinear wave propagation and using a single diverging acoustic beam. The performance of the original computational method to quantitatively measure volume was compared with an alternative algorithm using simulations on nonlinear wave propagation and in-vivo measurements. Measurements were performed with an experimental setup including a custom designed multilayer transducer.
In many industrial applications, nonlinear standing wave fields form due to reflections at the fluid boundaries. The characterization of such ultrasonic standing wave fields requires numerical and experimental methods. The numerical simulation of high-intensity ultrasonic standing waves are considered based on a finite element (FE) scheme, which allows the simulation of nonlinear wave propagation. Firstly, we verify our numerical results by comparing them to analytical solutions. Next, data is presented showing the nonlinear distortion effects in a standing wave with cylindrical symmetry. We are also presenting measurements of standing waves using different measurement techniques. Hydrophones and a laser vibrometer are used as measuring instruments. Experiments were carried out in cylindrical containers filled with a fluid, both with and without cavitation. Comparisons are made between measurement results from the FE simulations.
Nonlinear wave propagation in tissue has been simulated using typical propagation parameters for liver. The results indicate that the amplitude level of higher order harmonics can exceed the level of the second harmonic component. In that case detection of the higher order components can be achieved with increased signal to noise ratio due to the fact that the amplitude of the 3/sup rd/ order component can be higher than the 2/sup nd/ harmonic and the fact that the 3/sup rd/ order mixing component falls into the middle of the transducer bandwidth. Odd order harmonic components are of particular interest since they create spectral mixing products at the fundamental frequency. Therefore, transmission and reception can operate around the same center frequency.
We describe a MATLAB implementation of a 2D wave solver capable of simulating the linear and nonlinear propagation of ultrasonic waves through an attenuating medium modeled as a 2D spatial grid, the acoustic properties of which can be arbitrarily assigned at each node. The object of this work is to create a freely distributed nonlinear wave solver that is useful for both ultrasound research and the instruction of nonlinear and ultrasound acoustics, and that is written in a popular interpreted language so that the model can be quickly and easily modified to address a range of simulation tasks. The solver is based on a pseudospectral derivative, time-domain integration algorithm previously described by Wojcik, et al. (1997), and models frequency-dependent attenuation through the application of multiple relaxation mechanisms. Forcing functions can be applied over simulation time to nodes on the calculation surface to simulate arbitrary ultrasound array geometries. The time record of any parameters can also be stored in order to, for example, measure the magnitude of harmonics or determine an array's point spread function. We present results from the solver, discuss its theoretical basis and structure, describe its calculation requirements given a variety of grid geometries and acoustic conditions, and provide the contact information needed to obtain the code.
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