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See searches and references containing DRIFT VELOCITY!DRIFT VELOCITY
Average velocity of particles mainly moving randomly
In physics, drift velocity is the average velocity attained by charged particles, such as electrons, in a material due to an electric field. In general
Drift_velocity
Average velocity of a fluid parcel in a gravity wave
For a pure wave motion in fluid dynamics, the Stokes drift velocity is the average velocity when following a specific fluid parcel as it travels with the
Stokes_drift
Center of motion of a charged particle
drifts. A simple example of a force drift is a plasma in a gravitational field, e.g. the ionosphere. The drift velocity is v g = m q g × B B 2 {\displaystyle
Guiding_center
Movement of charge carriers due to the applied electric field
of charge carriers. The drift velocity is the average velocity of the charge carriers in the drift current. The drift velocity, and resulting current,
Drift_current
Quantity in solid-state physics
material, the electrons respond by moving with an average velocity called the drift velocity, v d {\displaystyle v_{d}} . Then the electron mobility μ
Electron_mobility
Rate of travel of electric energy
vacuum. However, the electrons themselves move much more slowly (see drift velocity and electron mobility). By the 1740s, William Watson had conducted several
Speed_of_electricity
Vector field which is used to mathematically describe the motion of a continuum
continuum mechanics the flow velocity in fluid dynamics, also macroscopic velocity in statistical mechanics, or drift velocity in electromagnetism, is a
Flow_velocity
Charge carrier velocity
semiconductor is said to be in a state of velocity saturation. Charge carriers normally move at an average drift speed proportional to the electric field
Saturation_velocity
Law of electrical current and voltage
path due to the collisions, but generally drift in a direction opposing the electric field. The drift velocity then determines the electric current density
Ohm's_law
Flow of electric charge
three velocities can be illustrated by an analogy with the three similar velocities associated with gases (see also hydraulic analogy): The low drift velocity
Electric_current
Equation in Brownian motion
coefficient; μ is the "mobility", or the ratio of the particle's terminal drift velocity to an applied force, μ = vd/F; kB is the Boltzmann constant; T is the
Einstein relation (kinetic theory)
Einstein_relation_(kinetic_theory)
Basic law of electromagnetism
{v} _{c}} is the velocity of the conductor (the ions in the material), and v d {\displaystyle \mathbf {v} _{d}} is the drift velocity of the electrons
Faraday's_law_of_induction
Ability of charged particles to move through a medium in response to an electric field
drift velocity according to the formula v d = μ E , {\displaystyle v_{\text{d}}=\mu E,} where v d {\displaystyle v_{\text{d}}} is the drift velocity (SI
Electrical_mobility
Combination of the diffusion and convection (advection) equations
this equation is called the drift–diffusion equation. The word "drift" is related to drift current and drift velocity. The equation is normally written:
Convection–diffusion_equation
Concept in fluid dynamics
is the mean flow velocity in an Eulerian reference frame and u S {\displaystyle {\boldsymbol {u}}_{S}} is the Stokes drift velocity – provided both are
Coriolis–Stokes_force
Study of the movement of stars
through space. Stellar kinematics encompasses the measurement of stellar velocities in the Milky Way and its satellites as well as the internal kinematics
Stellar_kinematics
Proportional counter that detects charged particles and photons
measuring the velocity of the electrons in a gas (drift velocity) there are special drift chambers, velocity drift chambers, which measure the drift time for
Wire_chamber
Physics apparatus to demonstrate rotation of Earth
result of the experiment is that the water moves with a certain constant drift velocity around the tube after the doughnut has been rotated. If there were no
Compton_generator
Forcing of the mean flow through wave–current interaction
flow through wave–current interaction, specifically between the Stokes drift velocity and the mean-flow vorticity. The CL vortex force is used to explain
Craik–Leibovich_vortex_force
Electrohydrodynamic aircraft propulsion
collector. These ions travel at a constant average velocity termed the drift velocity. Such velocity depends on the mean free path between collisions,
Ion-propelled_aircraft
Measure of a substance's ability to resist or conduct electric current
resulting electric field causes electrons to drift towards the positive terminal. The actual drift velocity of electrons is typically small, on the order
Electrical resistivity and conductivity
Electrical_resistivity_and_conductivity
electrons in piezoelectric semiconductors, when the drift velocity of the electrons exceeds the velocity of sound. The term 'acousto-electronics' is often
Acousto-electronics
Device for trapping charged particles
ω c {\displaystyle \omega _{c}} and a drift velocity in the y {\displaystyle y} -direction. The drift velocity is perpendicular to the direction of the
Ion_trap
Separation technique to characterize the size of colloidal particles
accumulation wall (a distance less than 10 μm), which requires the drift velocity caused by the force field to be two orders of magnitude higher compared
Field_flow_fractionation
Amount of charge flowing through a unit cross-sectional area per unit time
t) is the current density vector; vd(r, t) is the particles' average drift velocity (SI unit: m∙s−1); ρ ( r , t ) = q n ( r , t ) {\displaystyle \rho (\mathbf
Current_density
Species of marine cnidarian
wash up on beaches. Moderately strong winds, around 5 m/s, produce drifting velocities significantly higher than the typical speed of ocean currents. When
Portuguese_man_o'_war
Widely used analogy for explaining electrical circuits
resembling spigots and buckets. Fluid velocity and resistance of metals: As with water hoses, the carrier drift velocity in conductors is directly proportional
Hydraulic_analogy
Semiconductor materials with a larger band gap
mobility. The drop in drift velocity at high electric fields due to intervalley scattering is small in comparison to high saturation velocity that results from
Wide-bandgap_semiconductor
Autowave vortex in a two-dimensional active medium
reverberator: while the drift velocity quickly goes to a stationary value during meander, a steady decrease in the drift velocity of the vortex can be observed
Autowave_reverberator
Vortices at the ocean's surface
the mean flow with wave averaged flows of the surface waves. Stokes drift velocity of the waves stretches and tilts the vorticity of the flow near the
Langmuir_circulation
Large formation of floating ice
{F}}_{\text{s}}+{\vec {F}}_{\text{p}},} where m is the iceberg mass, v the drift velocity, and the variables f, k, and F correspond to the Coriolis force, the
Iceberg
Electromagnetic property of matter
the conventional current in most metallic wires is opposite to the drift velocity of the actual charge carriers; i.e., the electrons. The total electric
Electric_charge
Random motion of particles suspended in a fluid
approaches: Einstein assumed Stokes drag applied directly to the macroscopic drift velocity, while Smoluchowski performed a more detailed kinematic collision analysis
Brownian_motion
Phenomena related to electric charge
particles themselves can move quite slowly, sometimes with an average drift velocity only fractions of a millimetre per second, the electric field that drives
Electricity
Electric charge treated as continuously distributed in space
steady-state drift transport and therefore strong scattering. Child's law was further generalized by Buford R. Conley in 1995 for the case of non-zero velocity at
Space_charge
Form of diode
higher than those in the usual conduction band, so the mobility or drift velocity of the electrons in that band is lower. As the forward voltage increases
Gunn_diode
Physical law relating thermal and electrical conductivities
limits their free flight. This establishes an average or drift velocity Vd. The drift velocity is related to the average scattering time as becomes evident
Wiedemann–Franz_law
Generalization of the Nernst equation for the membrane potential
electric field; Formally, it is [A] multiplied by the drift velocity of the ions, with the drift velocity expressed using the Stokes–Einstein relation applied
Goldman_equation
Sea ice of the Southern Ocean
drive sea ice drift, and modelling research suggests that the observed sea ice expansion was driven by changes in the sea ice drift velocity. Another possible
Antarctic_sea_ice
When the raster distortions are linear, i. e., when the drift velocity is constant, to correct drift, it is sufficient to measure coordinates of only one
Counter-scanning
Exactly solvable model of coupled oscillators
t}}+{\frac {\partial }{\partial \theta }}[\rho v]=0,} where v is the drift velocity of the oscillators given by taking the infinite-N limit in the transformed
Kuramoto_model
Type of resistor whose resistance varies with temperature
= cross-sectional area of the material (m2), v {\displaystyle v} = drift velocity of electrons (m/s), e {\displaystyle e} = charge of an electron ( e
Thermistor
plasma so different species (ions and electrons) can have different drift velocities. The energy from the particles can lead to plasma wave excitation.
Two-stream_instability
Accumulation of particles into a massive object by gravitationally attracting more matter
increasingly large relative velocities with respect to other particles in their vicinity, as well as a systematic inward drift velocity, that leads to destructive
Accretion_(astrophysics)
Australian physicist (1938–2021)
to the Australian National University. The research focussed on the drift velocities and diffusion coefficients of electrons in nitrogen, hydrogen and helium
Rodney_Jory
Fluid dynamics theory on gravity waves
above on second-order wave properties). The Stokes drift velocity ūS, which is the particle drift after one wave cycle divided by the period, can be estimated
Airy_wave_theory
Chemical compound
ambient-temperature electron mobility of 78000 cm2/(V⋅s), electron drift velocity, and ballistic length (up to 0.7 μm at 300 K) of any known semiconductor
Indium_antimonide
Conductivity per molar concentration of electrolyte
each ionic species is proportional to its electrical mobility (μ), or drift velocity per unit electric field, according to the equation λ = z μ F , {\displaystyle
Molar_conductivity
Contraction of length in the direction of propagation in Minkowski space
moving and contracted, resulting in the same imbalance. The electron drift velocity is relatively very slow, on the order of a meter an hour but the force
Length_contraction
Vacuum tube which generates high-frequency radio waves
compresses the electron beam, converting the longitudinal drift velocity to transverse orbital velocity, in a process similar to that occurring in a magnetic
Gyrotron
Motion of charged particles in electric field
of low Reynolds number and moderate electric field strength E, the drift velocity of a dispersed particle v is simply proportional to the applied field
Electrophoresis
Computer that uses photons or light waves
computer.[citation needed] Since light can travel much faster than the drift velocity of electrons, and at frequencies measured in THz, optical transistors
Optical_computing
Radial drifting in protoplanetary disks
to orbit at slower velocities relative to the surrounding gas. Radial drifting refers to the particular scenario of inward drifting occurring to larger
Radial_drift
Atmospheric phenomenon
Ponomarov, Y. N.; Zosinova, A. G. (1973). "Direct measurements of ion drift velocity in the upper ionosphere during a magnetic storm". Cosmicheskie Issled
Subauroral_ion_drift
Elementary particle with negative charge
free electrons. Because of collisions between electrons and atoms, the drift velocity of electrons in a conductor is on the order of millimeters per second
Electron
Dark matter research project
the particle interaction. Electrons in liquid xenon have a uniform drift velocity. This allows the interaction depth of the event to be determined by
XENON
Statistical physics theorem
D and the particle mobility μ, the ratio of the particle's terminal drift velocity to an applied force; kB is the Boltzmann constant, and T is the absolute
Fluctuation–dissipation theorem
Fluctuation–dissipation_theorem
Type of material
electric field, while others slow down slightly. This creates a net drift velocity that leads to an electric current. This involves small changes in which
Metal
Physical phenomenon
result in eddies because the plasma moves around them with the E-cross-B drift velocity equal to E/B. These eddies play a similar role to the gyro-orbits in
Bohm_diffusion
Analytical technique used to separate and identify ionized molecules in the gas phase
mobility K is defined as the proportionality factor between an ion's drift velocity vd in a gas and an electric field of strength E: v d = K E . {\displaystyle
Ion_mobility_spectrometry
the particle experience a non-zero time average velocity, in other words, a net electrophoretic drift, even when the time average of the applied electric
Synchronous coefficient of drag alteration
Synchronous_coefficient_of_drag_alteration
Process in plasma physics
\over \omega _{pi}^{2}}.} Nevertheless, if the drift velocity of electrons exceeds the thermal velocity of plasma, a steady state cannot be achieved and
Magnetic_reconnection
Transport of dissolved species from the highest to the lowest concentration region
coefficient and the mobility (the ratio of the particle's terminal drift velocity to an applied force). For charged particles: D = μ k B T q , {\displaystyle
Diffusion
travelled. distance A numerical description of how far apart objects are. drift velocity Doppler effect The change in frequency of a wave (or other periodic
Glossary_of_physics
Device that switches or amplifies optical signals
speed of light in an optical medium is typically much faster than the drift velocity of electrons in semiconductors. Optical transistors can be directly
Optical_transistor
Quantum mechanical statistic
particle velocity v = v B + v S × s {\displaystyle \mathbf {v} =\mathbf {v} _{B}+\mathbf {v} _{S}\times \mathbf {s} } where the "drift velocity" is v B
Quantum_potential
Gradual change in the total energy of a closed system over time
In computer simulations of mechanical systems, energy drift is the gradual change in the total energy of a closed system over time. According to the laws
Energy_drift
Downwind component of motion of a floating object due to wind
that the craft drifts directly downwind. See figure 1 and figure 2. Leeway Velocity Vector (|L| cm/s): The magnitude of the leeway velocity. Leeway speed
Leeway
Understanding of gas properties in terms of molecular motion
diffusivity; μ is the "mobility", or the ratio of the particle's terminal drift velocity to an applied force, μ = vd/F; kB is the Boltzmann constant; T is the
Kinetic_theory_of_gases
HighPower LED
ionization zones. The drift velocity was measured to be of the order of 104 m/s, which is about only 10% of the electron drift velocity. Substrate pretreatment
High-power impulse magnetron sputtering
High-power_impulse_magnetron_sputtering
ESA's space program to study Earth's magnetic field
CEA-Leti. Electric Field Instrument (EFI): Measurement of ion density, drift velocity, and electric field. EFI consist of two components, the Langmuir Probe
Swarm_(spacecraft)
Sediment moved by the longshore current
Longshore drift from longshore current is a geological process that consists of the transportation of sediments (clay, silt, pebbles, sand, shingle, shells)
Longshore_drift
AGATA gamma-ray detector
principle is illustrated in the figure. Effects such as anisotropic carrier drift velocity with respect to the crystallographic axis direction of the Ge crystal
AGATA_(gamma-ray_detector)
Ionized part of Earth's upper atmosphere
density, but also on the ion and electron temperatures, ion masses and drift velocities. Incoherent scatter radars can also measure neutral atmosphere movements
Ionosphere
Rifle cartridge
high muzzle velocity and relatively flat trajectory, characteristics that make it well suited for long-range shooting with reduced wind drift. List of rifle
.22_Creedmoor
Free-moving particle which carries an electric charge
concentration in a metal and for the purposes of calculating currents or drift velocities can be used in the same way. Free carriers are electrons (holes) that
Charge_carrier
Curve traced by a point on a rolling circle
components, the rolling velocity V a {\displaystyle V_{a}} and the drifting velocity V d {\displaystyle V_{d}} , which are equal in modulus because the
Cycloid
pyramids. Bulk Monte Carlo Tool calculates the bulk values of the electron drift velocity, electron average energy and electron mobility for electric fields applied
NanoHUB
NASA satellite of the Explorer program
composition information, vehicle potential and plasma drift velocity parallel to the velocity vector. Two of the three similar sensors had an additional
Explorer_51
Experiment in South Dakota, United States
the interaction: by using the drift velocity of electrons in xenon at a given electric field, one can convert the drift time to a physical depth, or Z
LZ_experiment
NASA satellite of the Explorer program
composition information, and vehicle potential and plasma drift velocity parallel to the velocity vector. With the retarding grid at constant zero volts
Explorer_55
Medium machine gun
The True Velocity RM338, formerly designated as the Lightweight Medium Machine Gun (LWMMG), is a general-purpose machine gun first developed by General
True_Velocity_RM338
An ion drift meter is a device used to measure the velocity of individual ions in the area of a spacecraft. This information can then be used to calculate
Ion_drift_meter
Type of transient electric discharge
the electric field, that is, in the same direction as the electrons drift velocity. Positive streamers propagate in the opposite direction. In both cases
Streamer_discharge
Hofmann, K.R. (November 1992). "Electron mobilities and high-field drift velocities in strained silicon on silicon-germanium substrates". IEEE Transactions
Strained_silicon
Dish antenna
from ionospheric electrons to deduce height- and time-resolved plasma drift velocities, electron and ion temperatures, electron densities, ion composition
Millstone_Hill
(DOS) and the particle velocity. A Full-band E(K) relation can be obtained using the semi-empirical pseudopotential method. Both drift diffusion (DD) and
Monte Carlo methods for electron transport
Monte_Carlo_methods_for_electron_transport
Phenomenon wherein objects appear to move about their true positions in the sky
aberration, or velocity aberration) is a phenomenon where celestial objects exhibit an apparent motion about their true positions based on the velocity of the
Aberration_(astronomy)
Radar technology
A Doppler velocity sensor (DVS) is a specialized Doppler radar that uses the Doppler effect to measure the three orthogonal velocity components referenced
Doppler_velocity_sensor
Numerical integration algorithm
steps, and is identical to the 'kick-drift-kick' form of leapfrog method integration. Eliminating the half-step velocity, this algorithm may be shortened
Verlet_integration
NASA satellite of the Explorers Program
ion flux along the velocity vector of the spacecraft. This data was then used to determine the ion temperature and drift velocity in the spacecraft's
Dynamics_Explorer
Method of capturing aurora
Christiano; Terra, Pedrina; Gobbi, Delano (January 16, 2020). "Mean Zonal Drift Velocities of Plasma Bubbles Estimated from Keograms of Nightglow All-Sky Images
Keogram
Partial differential equation
time evolution of the probability density function of the position or velocity of a particle under the influence of drag forces and random forces, as
Fokker–Planck_equation
NASA satellite of the Explorer program
emissions. The Ion drift meter (IDM) measured the bulk motions of the ionospheric plasma perpendicular to the satellite velocity vector. The measured
Dynamics_Explorer_2
detection speed depends upon the drift velocities of the electrons and holes. And between these two holes have slower drift velocity than the electrons. The transit
Resonant-cavity-enhanced photo detector
Resonant-cavity-enhanced_photo_detector
NASA satellite of the Explorer program
composition information, vehicle potential and plasma drift velocity parallel to the velocity vector. Two of the three similar sensors had an additional
Explorer_54
Directional mass flow of oceanic water
classified by their velocity, dimension, and direction as either drifts, currents, or streams. Drifts, such as the North Atlantic Drift Current, involve
Ocean_current
Superseded theory of electromagnetism
observed metals as they cooled, and used superconductors to obtain a large drift velocity. None of these searches have observed any discrepancy from Coulomb's
Weber_electrodynamics
electrons will drift slowly through the material as described by the electron mobility. For low-energy electrons, faster drift velocities result in more
Relativistic runaway electron avalanche
Relativistic_runaway_electron_avalanche
Speed of electromagnetic waves
light in vacuum is the same for all observers, no matter their relative velocity. As a result, massless particles and waves travel at c in a vacuum regardless
Speed_of_light
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