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Numerical solution method of computational electromagnetics
The finite-difference frequency-domain (FDFD) method is a numerical solution method for problems usually in electromagnetism and sometimes in acoustics
Finite-difference frequency-domain method
Finite-difference_frequency-domain_method
Numerical analysis technique
Finite-difference time-domain (FDTD) or Yee's method (named after the Chinese American applied mathematician Kane S. Yee, born 1934) is a numerical analysis
Finite-difference time-domain method
Finite-difference_time-domain_method
Branch of physics
field solver Electromagnetic wave equation Finite-difference time-domain method Finite-difference frequency-domain Mie theory Physical optics Rigorous coupled-wave
Computational electromagnetics
Computational_electromagnetics
Type of filter in signal processing
processing, a finite impulse response (FIR) filter is a filter whose impulse response (or response to any finite length input) is of finite duration, because
Finite_impulse_response
Signal representation
engineering, and statistics, the frequency domain refers to the analysis of mathematical functions or signals with respect to frequency (and possibly phase), rather
Frequency_domain
Numerical analysis technique for waves
the finite-difference time-domain method (FDTD): in PSTD, the spatial derivative terms of the wave equation are evaluated in the spectral domain using
Pseudospectral time-domain method
Pseudospectral_time-domain_method
Method in numerical analysis
linear step is made in the frequency domain while the nonlinear step is made in the time domain. An example of usage of this method is in the field of light
Split-step_method
Class of methods used in numerical analysis and scientific computing to solve ODE/PDE
Spectral methods and finite-element methods are closely related and built on the same ideas; the main difference between them is that spectral methods use
Spectral_method
Signal processing algorithm
The method of reassignment is a technique for sharpening a time-frequency representation (e.g. spectrogram or the short-time Fourier transform) by mapping
Reassignment_method
American engineer (1949–2021)
domain" and "FDTD" in the 1980 paper, "Application of the finite-difference time-domain method to sinusoidal steady-state electromagnetic penetration problems
Allen_Taflove
Type of differential equation
equations using finite difference equations to approximate derivatives. Similar to the finite difference method or finite element method, values are calculated
Partial_differential_equation
Method of solving linear partial differential equations
and mathematical modeling. It is similar to the more widely used finite element method, in that it breaks down the object of study into a series of points
Boundary_element_method
Software for electromagnetic simulations
Technology in 2006. Operating under Unix-like systems, it uses finite-difference time-domain method with perfectly matched layer or periodic boundary conditions
Meep_(software)
Optical filter
to 3 dimensions of the spectral domain MoM method commonly used for analyzing 2D periodic structures such as frequency selective surfaces (FSS). In both
Frequency_selective_surface
Numerical method in computational electromagnetics
conditions. This is done by using discrete meshes as in finite difference and finite element methods, often for the surface. The solutions are represented
Method of moments (electromagnetics)
Method_of_moments_(electromagnetics)
Mathematical transform that expresses a function of time as a function of frequency
Functions that are localized in the time domain have Fourier transforms that are spread out across the frequency domain and vice versa, a phenomenon known as
Fourier_transform
Computational electromagnetics Finite-difference time-domain method Eigenmode expansion Finite element method Maxwell's equations Method of lines Light Photon
Beam_propagation_method
Probabilistic problem-solving algorithm
Kuo-Chin; Fan, Chia-Ming (March 15, 2021). "Improvement of generalized finite difference method for stochastic subsurface flow modeling". Journal of Computational
Monte_Carlo_method
Power spectrum of a noise signal
spectra are finite if integrated to the high-frequency end, and all flatter power-law spectra are finite if integrated to the DC, low-frequency limit.[citation
Colors_of_noise
Technique to solve geological problems by computational simulation
equations. With numerical models, geologists can use methods, such as finite difference methods, to approximate the solutions of these equations. Numerical
Numerical_modeling_(geology)
Linear transform from the time domain to the frequency domain
valued frequency-domain (the z-domain or z-plane) representation. It can be considered a discrete-time counterpart of the Laplace transform (the s-domain or
Z-transform
Method of solving differential equations
Multigrid methods can be applied in combination with any of the common discretization techniques. For example, the finite element method may be recast
Multigrid_method
Technique in computational electromagnetism
Photonic crystal Computational electromagnetics Finite-difference time-domain method Finite element method Maxwell's equations Andrianov, Igor V.; Danishevskyy
Plane_wave_expansion_method
Modelling technique in mechanical engineering
element method (BEM) and the finite element method (FEM). These methods can be considered as "first level" domain decomposition techniques. The finite element
Dynamic_substructuring
Device for suppressing part of a signal
this means removing some frequencies or frequency bands. However, filters do not exclusively act in the frequency domain; especially in the field of
Filter_(signal_processing)
Analysis and solving of problems that involve fluid flows
and V e {\displaystyle V^{e}} is the volume of the element. The finite difference method (FDM) has historical importance and is simple to program. It is
Computational_fluid_dynamics
Formulation of the finite element method
a topic in mathematics, the spectral element method (SEM) is a formulation of the finite element method (FEM) that uses high-degree piecewise polynomials
Spectral_element_method
Statistical model used in time series analysis
seasonal-differencing is a comb filter to suppress respectively the low-frequency trend and the periodic-frequency season in the spectrum domain (rather
Autoregressive integrated moving average
Autoregressive_integrated_moving_average
Fineness ratio Finite-difference frequency-domain method Finite-difference time-domain method Finite-volume method Finite potential well Finite strain theory
Index_of_physics_articles_(F)
Property of many linear time-invariant (LTI) systems
a finite impulse response (FIR) system, in which the impulse response does become exactly zero at times t > T {\displaystyle t>T} for some finite T {\displaystyle
Infinite_impulse_response
Frequency of a chirp pulse
characteristics in terms of its frequency components. This frequency-domain representation is an alternative to the more familiar time-domain waveform, and the two
Chirp_spectrum
Integral transform useful in probability theory, physics, and engineering
in the time domain) to a function of a complex variable s {\displaystyle s} (in the complex-valued frequency domain, also known as s-domain or s-plane)
Laplace_transform
Periodicity computation method
Least-squares spectral analysis (LSSA) is a class of methods for estimating a frequency spectrum by fitting sinusoids to data using a least-squares fit
Least-squares spectral analysis
Least-squares_spectral_analysis
Method for numerical differential equations
Galerkin method, Hybrid Mixed Mimetic method, the Nodal Mimetic Finite Difference method, some Discrete Duality Finite Volume schemes, and some Multi-Point
Gradient discretisation method
Gradient_discretisation_method
Sequence of operations for a task
truly "correct" recommendation. As an effective method, an algorithm can be expressed within a finite amount of space and time and in a well-defined formal
Algorithm
Signal processing technique
whole generating spectrum. Spectrum analysis, also referred to as frequency domain analysis or spectral density estimation, is the technical process of
Spectral_density_estimation
Electronic control system
in phase domain is asymptotically equal (the difference G ( t ) − g ( t ) {\displaystyle G(t)-g(t)} is small with respect to the frequencies) to the output
Phase-locked_loop
Type of stochastic process
org/document/5495887 Douglas Baptista de Souza et al. (2012). A modified time-frequency method for testing wide-sense stationarity. 2012 IEEE International Conference
Stationary_process
Model to describe physical and thermodynamical processes in oceans
unstaggered or staggered grids. According to methods of approximation we have finite difference and finite element models. There are three basic types
Ocean general circulation model
Ocean_general_circulation_model
Function for integral Fourier-like transform
continuous wavelet transforms, a given signal of finite energy is projected on a continuous family of frequency bands (or similar subspaces of the Lp function
Wavelet
Method for converting signals between digital and analog
modulation is an oversampling method for encoding signals into low bit depth digital signals at a very high sample-frequency as part of the process of delta-sigma
Delta-sigma_modulation
Control loop feedback mechanism
Approximations for first-order derivatives are made by backward finite differences. u ( t ) {\displaystyle u(t)} and e ( t ) {\displaystyle e(t)} are
PID_controller
Fourier-related transform for signals that change over time
the minimum frequency that can be resolved by a finite duration time window. Given a time window that is Τ seconds long, the minimum frequency that can be
Short-time_Fourier_transform
American electrical engineer
moment method, IEEE Transactions on Antennas and Propagation 51 (9), 2402-2412". September 2003. "Introduction to the finite-difference time-domain (FDTD)
Stephen_Gedney
Engineering software
which the computational cost is independent of wavelength. A Finite Difference Time Domain (FDTD) solver was added in May 2014 with the release of FEKO
FEKO
Form of radar used to create images of landscapes
two methods: Time-domain Backprojection and Frequency-domain Backprojection. The time-domain Backprojection has more advantages over frequency-domain and
Synthetic-aperture_radar
Algorithm used for points in euclidean space
of Lloyd's algorithm include smoothing of triangle meshes in the finite element method. Example of Lloyd's algorithm. The Voronoi diagram of the current
Lloyd's_algorithm
Characteristic time in a system
input, or the impulse response to a Dirac delta function input. In the frequency domain (for example, looking at the Fourier transform of the step response
Time_constant
Device that converts a digital signal into an analog signal
domain to enhance the performance of the combined DAC. The combination of the signals can be performed either in the time domain or in the frequency domain
Digital-to-analog_converter
Branch of engineering and mathematics
replaced by algebraic equations in the frequency domain which is much simpler to solve. However, frequency domain techniques can only be used with linear
Control_theory
Signal analysis tool
method to the IMFs to obtain instantaneous frequency data. Since the signal is decomposed in time domain and the length of the IMFs is the same as the
Hilbert–Huang_transform
Fundamental principle of physics
mathematically; there is a large body of mathematical techniques, frequency-domain linear transform methods such as Fourier and Laplace transforms, and linear operator
Superposition_principle
Analog of the continuous Laplace operator
Approximations of the Laplacian, obtained by the finite-difference method or by the finite-element method, can also be called discrete Laplacians. For example
Discrete_Laplace_operator
Branch of statistics focusing on spatial data sets
(geostatistics) Sill (geostatistics) Nugget effect Training image Finite difference method Arbia's law of geography Concepts and Techniques in Modern Geography
Geostatistics
Integral transform and linear operator
particularly simple representation in the frequency domain: It imparts a phase shift of ±90° (π/2 radians) to every frequency component of a function, the sign
Hilbert_transform
Discrete Fourier transform algorithm
transform converts a signal from its original domain (often time or space) to a representation in the frequency domain and vice versa. The DFT is obtained by
Fast_Fourier_transform
Strength of an object's radar echo
numerical methods such as the boundary element method (method of moments), finite difference time domain method (FDTD) and finite element methods are limited
Radar_cross_section
Probability theory concept
computer realisations of an fBm can be generated, although they are only a finite approximation. The sample paths chosen can be thought of as showing discrete
Fractional_Brownian_motion
Device for suppressing part of a discretely-sampled signal
function to a linear constant-coefficient difference equation (LCCD) via the Z-transform. The discrete frequency-domain transfer function is written as the
Digital_filter
Mathematical descriptions of transmission line voltage and current
time domain and the frequency domain. In the time domain the independent variables are distance and time. In the frequency domain the independent variables
Telegrapher's_equations
it. The main difference between signal noise and emissions is that noise exists in a finite energy signal while emission exists in a finite power signal
Conducted_emissions
Mathematical curve outputted from a specific pair of parametric equations
Lissajous figures: various frequency relations and phase differences. Aesthetically interesting Lissajous curves with a finite sum of the first 100, 1000
Lissajous_curve
Technique to find image offset
data sets. It is commonly used in image registration and relies on a frequency-domain representation of the data, usually calculated by fast Fourier transforms
Phase_correlation
Measurement process
ISSN 0016-8033. Brzostowski, M.A.; Black, J.L. (1989). "Frequency dispersion in finite-difference migration". Geophysics. 54 (11). Society of Exploration
Seismic_migration
Generates a forecast of future values of a time series
signal processing, acting as low-pass filters to remove high-frequency noise. This method is preceded by Poisson's use of recursive exponential window
Exponential_smoothing
Imaging device for sound sources
be able to use the phase difference between the signals. As the sound propagates in the medium (air, water...) at a finite known speed, a sound source
Acoustic_camera
Family of iterative methods
central difference method with h = 2 c n {\displaystyle h=2c_{n}} . So the sequence { c n } {\displaystyle \{c_{n}\}} specifies the sequence of finite difference
Stochastic_approximation
Frameworks for modeling variables that evolve over time
The signal is defined over a domain, which may or may not be finite, and there is a functional mapping from the domain to the value of the signal. The
Discrete time and continuous time
Discrete_time_and_continuous_time
Signal processing design process
Frequency response Phase shift or group delay Impulse response Possible causal filter requirement Possible stable filter requirement Possible finite impulse
Filter_design
Replacing a number with a simpler value
between the domain and range. With finite precision (or a discrete domain), this translates to removing bias. A rounding method should have utility in computer
Rounding
Varying physical quantity that conveys information
time domain to a frequency or s domain; or from discrete time (n) to frequency or z domains. Systems can also be transformed between these domains, like
Signal
Mathematical technique used to solve a certain class of partial differential equations
three categories: Finite difference methods (FDM) Finite element methods (FEM) Spectral methods With the FDM, the continuous domain is replaced with a
Particle-in-cell
Nonlinear transduction mechanism
lobe-free beam of low frequency sound is created as a result of nonlinear mixing of two high frequency sound beams at their difference frequency. Parametric arrays
Parametric_array
Compact encoding of digital data
convert time domain sampled waveforms into a transform domain, typically the frequency domain. Once transformed, component frequencies can be prioritized
Data_compression
Sound synthesis technique
omitted in additive synthesis. As a result, only a finite number of sinusoidal terms with frequencies that lie within the audible range are modeled in additive
Additive_synthesis
same formalism. The discrete uniform distribution, where all elements of a finite set are equally likely. This is the theoretical distribution model for a
List of probability distributions
List_of_probability_distributions
Mathematical analysis of frequency content of signals
applications, multidimensional transforms are used to analyze the frequency content of signals in a domain of two or more dimensions. One of the more popular multidimensional
Multidimensional_transform
Zhang; Mei, K. K. (December 1988). "Time-domain finite difference approach to the calculation of the frequency-dependent characteristics of microstrip
Kenneth_K._Mei
Numerical technique
Susan C. Hagness (2005). Computational Electrodynamics: The Finite-Difference Time-Domain Method, 3rd ed. Artech House Publishers. ISBN 978-1-58053-832-9
Perfectly_matched_layer
n}=e^{t(\cos \theta -1)}.} With this frequency-domain approach, the scale-space properties transfer exactly to the discrete domain, or with excellent approximation
Scale_space_implementation
equation: Crank–Nicolson method for diffusion equations Finite difference method Lax–Wendroff for wave equations Runge–Kutta methods Euler integration Trapezoidal
List_of_algorithms
Sequence of data points over time
English language). Methods for time series analysis may be divided into two classes: frequency-domain methods and time-domain methods. The former include
Time_series
Mechanical oscillations about an equilibrium point
finite element method provides an approximation of the meshed surface (for which there exists an infinite number of vibration modes and frequencies)
Vibration
full-wave finite-difference frequency-domain (FDFD) method based MATLAB program for computing the Chern number has been written. Recently, the finite-difference
Photonic topological insulator
Photonic_topological_insulator
(2020). "Chipless RFID Readers for Frequency-Coded Tags: Time-Domain or Frequency-Domain?". IEEE Journal of Radio Frequency Identification. 4 (2): 146–158
Chipless_RFID
Function used in signal processing
frequency spectra. The duration of the segments is determined in each application by requirements like time and frequency resolution. But that method
Window_function
Measure of variation in statistics
Standard deviation can also be used to calculate standard error for a finite sample, and to determine statistical significance. When only a sample of
Standard_deviation
Process of using data analysis for predicting population data from sample data
exact distributions of sample statistics, many methods have been developed for approximating these. With finite samples, approximation results measure how
Statistical_inference
is an interferometric ultrashort pulse measurement technique in the frequency domain based on spectral shearing interferometry. Spectral shearing interferometry
Spectral phase interferometry for direct electric-field reconstruction
Spectral_phase_interferometry_for_direct_electric-field_reconstruction
Statistical method
is a Bayesian non-linear regression method. A Gaussian process (GP) is a collection of random variables, any finite number of which have a joint Gaussian
Bootstrapping_(statistics)
Type of statistical measure over subsets of a dataset
type of convolution. Thus in signal processing it is viewed as a low-pass finite impulse response filter. Because the boxcar function outlines its filter
Moving_average
Filter used in signal processing on continuous-time signals
progress was further hampered by a general failure to understand the frequency domain nature of signals. Image filters. Image filter theory grew out of transmission
Analogue_filter
Study of classical optics using Fourier transforms
the concept of frequency and time used in traditional Fourier transform theory, Fourier optics makes use of the spatial frequency domain (kx, ky) as the
Fourier_optics
Physical model of propagating energy
Electromagnetic radiation and health Evanescent wave coupling Finite-difference time-domain method Gravitational wave Helicon Impedance of free space Panofsky–Phillips
Electromagnetic_radiation
Global electromagnetic resonances, generated and excited by lightning discharges
S2CID 119780816. Yang, H.; Pasko, V. P. (2007). "Three-dimensional finite difference time domain modeling of the diurnal and seasonal variations in Schumann
Schumann_resonances
American scientist and engineer (1905–1982)
plots. In essence, his method made stability transparent to both the time and frequency domains and, furthermore, his frequency-domain-based analysis was
Hendrik_Wade_Bode
Mathematical technique in thermal field theory
g(\omega )} , at finite temperature it is given by the sum S η {\displaystyle S_{\eta }} . The trick to evaluate Matsubara frequency summation is to use
Matsubara_summation
Channel access method used by various radio communication technologies
it transmits over the entire frequency range and does not limit the user's frequency range. It is used as the access method in many mobile phone standards
Code-division_multiple_access
Operation in mathematical calculus
finite: ∫ E | f | d μ < + ∞ . {\displaystyle \int _{E}|f|\,d\mu <+\infty .} In that case, the integral is, as in the Riemannian case, the difference between
Integral
Apparent lack of pattern or predictability in events
unpredictable, but if there is a known probability distribution, the frequency of different outcomes over repeated events (or "trials") is predictable
Randomness
FINITE DIFFERENCE-FREQUENCY-DOMAIN-METHOD
FINITE DIFFERENCE-FREQUENCY-DOMAIN-METHOD
Male
English
Variant spelling of English Finnian, FINIAN means "little white one."
Male
English
English name derived from Latin Damianus, DAMIAN means "to tame, to subdue" and euphemistically "to kill."Â
Male
Hebrew
(דּï‹×¨Ö¸×Ÿ) Hebrew name of Greek origin, DORAN means "gift." Compare with another form of Doran.
Girl/Female
Tamil
Infinite, Divine
Girl/Female
Indian
Infinite, Divine
Boy/Male
Hindu, Indian
Difference
Boy/Male
Australian, French, German, Jamaican, Latin, Swiss
A Roman; Man from Rome
Male
Portuguese
Portuguese form of Latin Philippus, FILIPE means "lover of horses."
Male
Romanian
Romanian form of Latin Dorianus, DORIN means "of the Dorian tribe."
Male
English
English name coined by Oscar Wilde for a character in his novel The Portrait of Dorian Gray, 1891. Probably derived from Latin Dorianus, DORIAN means "of the Dorian tribe."
Female
French
Feminine form of French Romain, ROMAINE means "Roman."
Male
Slovene
Slovene form of Latin Dominicus, DOMEN means "belongs to the lord."
Surname or Lastname
English
English : from a diminutive of Dobb.Jewish (from Lithuania and Belarus) : metronymic from the Yiddish female personal name Dobke, a pet form of Dobre (see Dobrin).
Male
French
French form of Latin Romanus, ROMAIN means "Roman."
Girl/Female
French American
Woman of Rome.
Girl/Female
American, Australian, French, German, Latin
Woman from Rome; Of Rome; Citizen of Rome; Female Version of Roman
Boy/Male
English American Greek
Descendant of Dorus. Dorian was a character in Oscar Wilde's novel The Picture of Dorian Gray who...
Boy/Male
Shakespearean
Love's Labours Lost' Lord attending on King Ferdinand.
Boy/Male
French Latin
A Roman.
Boy/Male
Christian & English(British/American/Australian)
A Dorian
FINITE DIFFERENCE-FREQUENCY-DOMAIN-METHOD
FINITE DIFFERENCE-FREQUENCY-DOMAIN-METHOD
Girl/Female
Tamil
Not wild, Gentle
Boy/Male
Indian, Sanskrit
Fort
Girl/Female
Tamil
It comes from An indian leaf - Bilwa patra its is also that bilwanilayam which means Goddess lakshmis house
Girl/Female
British, English, Hebrew
Introduced to Britain in the 13th Century; Grace; Favour
Boy/Male
Tamil
Hridyanshu | ஹரதà¯à®¯à®¾à®‚à®·à¯
Light from heart, Moon
Boy/Male
Indian
Endless
Girl/Female
Hindu, Indian, Kannada, Malayalam, Tamil, Telugu
Knowledge of Vedas; Sources of Dharma; Music; Hearing; Ear
Girl/Female
Indian
Honored, Dignified, Highly
Male
Spanish
Spanish form of Latin Stephanus, ESTÉBAN means "crown."
Boy/Male
Hindu
Cheater
FINITE DIFFERENCE-FREQUENCY-DOMAIN-METHOD
FINITE DIFFERENCE-FREQUENCY-DOMAIN-METHOD
FINITE DIFFERENCE-FREQUENCY-DOMAIN-METHOD
FINITE DIFFERENCE-FREQUENCY-DOMAIN-METHOD
FINITE DIFFERENCE-FREQUENCY-DOMAIN-METHOD
n.
Frequency; abundance.
v. t.
To cause to differ; to make different; to mark as different; to distinguish.
n.
The condition of returning frequently; occurrence often repeated; common occurence; as, the frequency of crimes; the frequency of miracles.
v. t.
To invite or ask.
a.
Having certain or distinct; determinate in extent or greatness; limited; fixed; as, definite dimensions; a definite measure; a definite period or interval.
v. t.
To furnish with, or unite to, a woman.
n.
The act of differing; the state or measure of being different or unlike; distinction; dissimilarity; unlikeness; variation; as, a difference of quality in paper; a difference in degrees of heat, or of light; what is the difference between the innocent and the guilty?
imp. & p. p.
of Difference
a.
Having a limit; limited in quantity, degree, or capacity; bounded; -- opposed to infinite; as, finite number; finite existence; a finite being; a finite mind; finite duration.
adv.
In a finite manner or degree.
a.
Without limit in power, capacity, knowledge, or excellence; boundless; immeasurably or inconceivably great; perfect; as, the infinite wisdom and goodness of God; -- opposed to finite.
n.
The quality or state of being indifferent, or not making a difference; want of sufficient importance to constitute a difference; absence of weight; insignificance.
a.
Of various or contrary nature, form, or quality; partially or totally unlike; dissimilar; as, different kinds of food or drink; different states of health; different shapes; different degrees of excellence.
n.
Estimation of difference; regard to differences or distinguishing circumstance.
a.
Of or relating to a domain or to domains.
n.
Infrequency.
n.
See Conite.
adv.
At frequent or short intervals; many times; often; repeatedly; commonly.
n.
See Yenite.
n.
Often to be met with; happening at short intervals; often repeated or occurring; as, frequent visits.