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Characteristic time in a system
In physics and engineering, the time constant, usually denoted by the Greek letter τ (tau), is the parameter characterizing the response to a step input
Time_constant
Time constant of an RC circuit
The RC time constant, denoted τ (lowercase tau), the time constant of a resistor–capacitor circuit (RC circuit), is equal to the product of the circuit
RC_time_constant
Control loop feedback mechanism
used in industrial control systems and various other applications where constant control through modulation is necessary without human intervention. The
PID_controller
Decrease in value at a rate proportional to the current value
positive rate called the exponential decay constant, disintegration constant, rate constant, or transformation constant: d N ( t ) d t = − λ N ( t ) . {\displaystyle
Exponential_decay
Hypothetical conflict with the laws of physics as currently known
term physical constant expresses the notion of a physical quantity subject to experimental measurement which is independent of the time or location of
Time-variation of fundamental constants
Time-variation_of_fundamental_constants
The open-circuit time constant (OCT) method is an approximate analysis technique used in electronic circuit design to determine the corner frequency of
Open-circuit time constant method
Open-circuit_time_constant_method
Physical constant in quantum mechanics
The Planck constant, or Planck's constant, denoted by h {\displaystyle h} , is a fundamental physical constant of foundational importance in quantum mechanics:
Planck_constant
Physical constant equivalent to the Boltzmann constant, but in different units
The molar gas constant (also known as the gas constant, universal gas constant, or ideal gas constant) is denoted by the symbol R or R. It is the molar
Gas_constant
Universal and unchanging physical quantity
A physical constant, sometimes called a fundamental physical constant or universal constant, is a physical quantity that cannot be explained by a theory
Physical_constant
Type of signal filter
little attenuation below the cutoff frequency determined by its RC time constant. For current signals, a similar circuit, using a resistor and capacitor
Low-pass_filter
Emissions from unstable atomic nuclei
decay constant λ has units of t−1, and can thus also be represented as 1/τ, where τ is a characteristic time of the process called the time constant. In
Radioactive_decay
Mathematical model of a dendrite
namely the length constant (sometimes referred to as the space constant) denoted λ {\displaystyle \lambda } and the time constant denoted τ {\displaystyle
Cable_theory
generalized version of zero-value time-constants (ZVT), which in turn is the generalization of the open-circuit time constant method (OCT). While the other
General time- and transfer constant analysis
General_time-_and_transfer_constant_analysis
Value that is not changed during execution
valued) constants, immutable objects, and constant types (const). Typical examples of compile-time constants include mathematical constants, values from
Constant (computer programming)
Constant_(computer_programming)
Cryptographic attack
unintentionally with compiler optimizations. Countermeasures include blinding and constant-time functions. Many cryptographic algorithms can be implemented (or masked
Timing_attack
Physical constant for the strength of gravity induced by a mass
The gravitational constant is an empirical physical constant that gives the strength of the gravitational field induced by a mass. It is involved in the
Gravitational_constant
Physical constant relating particle kinetic energy with temperature
The Boltzmann constant (kB or k) is the proportionality factor that relates the average relative thermal energy of particles in a gas with the thermodynamic
Boltzmann_constant
Difference between logarithm and harmonic series
{\displaystyle \log _{e}(x)} . Euler's constant (sometimes called the Euler–Mascheroni constant) is a mathematical constant, usually denoted by the lowercase
Euler's_constant
Type of compiler optimization
Constant folding are related compiler optimizations used by many modern compilers that evaluate expressions whose values are known at compile time and
Constant_folding
Type of electronic circuit or optical filter
{sRC}{1+sRC}}.} The product of the resistance and capacitance (R×C) is the time constant (τ); it is inversely proportional to the cutoff frequency fc, that is
High-pass_filter
Method for algorithm analysis in computer science
constant time. However the dequeue operation is more complicated. If the output array already has some elements in it, then dequeue runs in constant time;
Amortized_analysis
Electric circuit composed of resistors and capacitors
capacitor voltage at time t = 0, and e is Euler's number. The time required for the voltage to fall to V0/e is called the RC time constant and is given by
RC_circuit
Time behavior of a system controlled by Heaviside step functions
be sufficiently well modeled in terms of a single dominant pole of time constant τ, that it, as an open-loop gain given by: A O L = A 0 1 + j ω τ , {\displaystyle
Step_response
Time taken by a signal to change to a high value
rise time is proportional to the network time constant τ = RC: t r ≅ 2.197 τ {\displaystyle t_{r}\cong 2.197\tau } The proportionality constant can be
Rise_time
Chart indicator of moving average convergence/divergence
series itself. The MACD indicator thus depends on three time parameters, namely the time constants of the three EMAs. The notation "MACD(a,b,c)" usually
MACD
5th episode of the 4th season of Lost
"The Constant" is the fifth episode of the fourth season of the American Broadcasting Company's (ABC) serial drama television series Lost, and the 77th
The_Constant
Generates a forecast of future values of a time series
(ARIMA) (0,1,1) model with no constant term. The time constant of an exponential moving average is the amount of time for the smoothed response of a
Exponential_smoothing
properties, the level of bias applied during recording, and the optimal time constant of replay equalization. Specifications of each type were set in 1979
Compact Cassette tape types and formulations
Compact_Cassette_tape_types_and_formulations
Class of artificial neural network
(y_{j}-\Theta _{j})+I_{i}(t)} Where: τ i {\displaystyle \tau _{i}} : Time constant of postsynaptic node y i {\displaystyle y_{i}} : Activation of postsynaptic
Recurrent_neural_network
Instrument for displaying time-varying signals
The RC time constants are adjusted to match. For example, the 9 megohm series resistor is shunted by a 12.2 pF capacitor for a time constant of 110 microseconds
Oscilloscope
Observation in physical cosmology
cosmic time coordinate. Though the Hubble constant H0 is constant at any given moment in time, the Hubble parameter H, of which the Hubble constant is the
Hubble's_law
Nineteenth letter in the Greek alphabet
sciences, tau is sometimes used as time variable, to avoid confusing t as temperature Time constant (also relaxation time) of any system, such as an RC circuit
Tau
Device for measuring alternating current
time constant much less than the lowest frequency of interest. The lossy integrator will reduce the effects of offset voltages and set the constant of
Rogowski_coil
2011 edition of the C++ programming language standard
concept of constant expressions. These are expressions such as 3 + 4 that will always yield the same results, at compile time and at runtime. Constant expressions
C++11
High-capacity electrochemical capacitor
time constant τ {\displaystyle \tau } τ = R i ⋅ C {\displaystyle \tau =R_{\text{i}}\cdot C} This time constant determines the charge/discharge time.
Supercapacitor
Oscillator that produces a nonsinusoidal repetitive waveform
then discharges it again. The period of the oscillator depends on the time constant of the capacitor or inductor circuit. The active device switches abruptly
Relaxation_oscillator
In neuroscience, aspect of a cell membrane
duration of chronaxie, which is a strength-duration time constant that corresponds to the duration of time that elicits a response when the nerve is stimulated
Rheobase
Physical phenomenon
time, a time constant known as T 1 {\displaystyle T_{1}} . There is a different parameter, T 2 {\displaystyle T_{2}} , the spin–spin relaxation time,
Spin–lattice_relaxation
Dutch painter
Constant Anton Nieuwenhuys (21 July 1920 – 1 August 2005), better known as Constant, was a Dutch painter, sculptor, graphic artist, author and musician
Constant_Nieuwenhuys
2.71828...; base of natural logarithms
with Euler's constant, a different constant typically denoted γ {\displaystyle \gamma } . Alternatively, e can be called Napier's constant after John Napier
E_(mathematical_constant)
Fixed number that has received a name
A mathematical constant is a number whose value is fixed by an unambiguous definition, often referred to by a special symbol (e.g., an alphabet letter)
Mathematical_constant
Continuous progression from past to future
time, in connection with the behavior of electricity and magnetism. The 1860s Maxwell's equations described that light always travels at a constant speed
Time
fundamental time constant within which a control solution must be computed for controllability and stability. This time constant, known as Ross' time constant, is
Ross'_π_lemma
Time required for the output of an amplifier to stabilize
02)}{\zeta \omega _{n}}}\approx {\frac {3.9}{\zeta \omega _{n}}}} Rise time Time constant Modern Control Engineering (5th Edition), Katsuhiko Ogata, p. 160
Settling_time
Response of spin to electromagnetic radiation
echo at time 2t. In simple cases, the intensity of the echo relative to the initial signal is given by e–2t/T2 where T2 is the time constant for spin–spin
Spin_echo
Influence on an oscillating physical system which reduces or prevents its oscillation
the number of cycles per time unit. It is expressed in inverse time units t − 1 {\displaystyle t^{-1}} , or hertz. Time constant: τ = 1 / λ {\displaystyle
Damping
Dimensionless number that quantifies the strength of the electromagnetic interaction
fine-structure constant, also known as the Sommerfeld constant, commonly denoted by α (the Greek letter alpha), is a fundamental physical constant that quantifies
Fine-structure_constant
Model of viscoelastic material
a constant rate: ε ( t ) = σ 0 E + t σ 0 η {\displaystyle \varepsilon (t)={\frac {\sigma _{0}}{E}}+t{\frac {\sigma _{0}}{\eta }}} If at some time t1
Maxwell_model
Constant describing the distance a membrane potential passively travels along a neuron
In neurobiology, the length constant (λ) is a mathematical constant used to quantify the distance that a graded electric potential will travel along a
Length_constant
Physical law relating heat loss to temperature difference
m} (kg). The time constant is then τ = m c / ( h A ) {\displaystyle \tau =mc/(hA)} . When the environmental temperature is constant in time, we may define
Newton's_law_of_cooling
Method to control electric motors
inductance Lm and low-pass filtering the result with the rotor no-load time constant Lr/Rr, namely, the rotor inductance to rotor resistance ratio. Current
Field-oriented_control
Primary time standard globally used to regulate clocks and time
UTC time scale, the second and all smaller time units (millisecond, microsecond, etc.) are of constant duration, but the minute and all larger time units
Coordinated_Universal_Time
Equilibrium points near two orbiting bodies
Sun–Earth L1 and L2 are saddle points and exponentially unstable with time constant of roughly 23 days. Satellites at these points will wander off in a
Lagrange_point
Resistive and inductive circuit
decay constant (in radians per second), and ω is the angular frequency (in radians per second). The complex-valued eigenfunctions of any linear time-invariant
RL_circuit
Radio transmission of audio by frequency modulation
de-emphasis used is defined by the time constant of a simple RC filter circuit. In most of the world, a 50 μs time constant is used. In the Americas and South
FM_broadcasting
Decay of nuclear spin polarization in MRI and NMR
the width or broadness of resonances. Stated more formally, T1 is the time constant for the physical processes responsible for the relaxation of the components
Relaxation_(NMR)
Time for a signal or other quantity to reach its destination
propagation delay. All of these factors influence each other through an RC time constant: any increase in load capacitance increases C, heat-induced resistance
Propagation_delay
Swiss luxury watch manufacturer
Frédérique Constant SA is a Swiss manufacture of luxury wristwatches based in Plan-les-Ouates, Geneva. Originally established in 1988 by Dutch married
Frédérique_Constant
Return of a perturbed system into equilibrium
V(t)=V_{0}e^{-{\frac {t}{RC}}}\ ,} The constant τ = R C {\displaystyle \tau =RC\ } is called the relaxation time or RC time constant of the circuit. A nonlinear
Relaxation_(physics)
Representation of a signal as a rectangular wave with varying duty cycle
mechanism varies the duty cycle according to the knob setting. The thermal time constant of the heating elements is several minutes, so that the temperature
Pulse-width_modulation
Electronic circuit that fixes voltage
provides a DC offset from the stored charge. The capacitor forms a time constant with a resistor load, which determines the range of frequencies over
Clamper_(electronics)
Type of spring
or just spring constant, equal to the change in torque required to twist the spring through an angle of 1 radian. The torsion constant may be calculated
Torsion_spring
Magnetic phenomenon
time, known as T2, a time constant characterizing the signal decay. It is named in contrast to T1, the spin–lattice relaxation time. It is the time it
Spin–spin_relaxation
This is a list of common physical constants and variables, and their notations. Note that bold text indicates that the quantity is a vector. List of letters
List of common physics notations
List_of_common_physics_notations
Estimate of time taken for running an algorithm
a constant factor. Since an algorithm's running time may vary among different inputs of the same size, one commonly considers the worst-case time complexity
Time_complexity
Physical phenomenon
quantity, (φRL= τconv/τrxn), which relates the time constant of solid particle heat transfer to the time constant of particle reaction, with the reactive Leidenfrost
Leidenfrost_effect
Mechanism recovering classical behavior from a quantum system
transform, so the time constant T2 is a main contributor to the bandwidth. The time constant T2 has been measured with ultrafast time-resolved spectroscopy
Dephasing
Average commuting time
Marchetti's constant is the average time spent by a person for commuting each day. Its value is approximately one hour, or half an hour for a one-way trip
Marchetti's_constant
Resonator damping parameter
cycle. It is a dimensionless parameter that compares the exponential time constant τ for decay of an oscillating physical system's amplitude to its oscillation
Q_factor
Device for electrical connection
The RC time constants are adjusted to match. For example, the 9 megohm series resistor is shunted by a 12.2 pF capacitor for a time constant of 110 microseconds
Test_probe
American folk song
"Man of Constant Sorrow" (also known as "I Am a Man of Constant Sorrow") is a traditional American folk song first published by Dick Burnett, a partially
Man_of_Constant_Sorrow
Mathematical descriptions of the properties of certain cells in the nervous system
is the membrane time constant, wk is the adaptation current number, with index k, τ k {\displaystyle \tau _{k}} is the time constant of adaptation current
Biological_neuron_model
general time- and transfer constant (TTC) analysis to determine the numerator terms and the zeros in the transfer function. The transfer constants are calculated
Transfer_constant
Sum of the inverses of the positive cubes
Apéry's constant is a mathematical constant, defined as the infinite sum of the reciprocals of the cubes of the positive integers. In symbols, ζ ( 3 )
Apéry's_constant
Theoretical means of transportation
the distances and speeds are scaled by the constant cos θ {\displaystyle \cos \theta } . The time constant ω {\displaystyle \omega } depends only on
Gravity_train
Relaxation model
dielectric constants, ω {\displaystyle \omega } is the angular frequency and τ {\displaystyle \tau } is a dielectric relaxation time constant. The exponent
Cole–Cole_equation
Electronic circuit to automatically adjust signal strength
to the grids of earlier RF amplifier stages. He selected a control time constant of about 1/40 second, allowing the circuit to follow signal fading while
Automatic_gain_control
Inertial navigation design principle
oscillates harmonically with Schuler's time constant. It can also be proved that the time is the same constant for a tunnel that is not through the center
Schuler_tuning
Device for measuring incident electromagnetic radiation
the absorbed power, the higher the temperature. The intrinsic thermal time constant, which sets the speed of the detector, is equal to the ratio of the
Bolometer
Units defined only by physical constants
exclusively in terms of four universal physical constants: c, G, ħ, and kB. Expressing one of these physical constants in terms of Planck units yields a numerical
Planck_units
Chemical property
Stability constants, formation constants, binding constants, association constants and dissociation constants are all types of equilibrium constants. For a
Equilibrium_constant
there are two constants that are commonly used: the membrane time constant τ, and the membrane length constant λ. The membrane time constant measures the
Electrotonic_potential
Direct current that does not change intensity with time
A constant current (steady current, time-independent current, stationary current) is a type of direct current (DC) that does not change its intensity with
Constant_current
Excavation or structure to provide access to groundwater
z=z_{T}-(z_{T}-z_{0})e^{-t/\tau }} where z0 is the well water level at time t=0 and τ is the well time constant: τ = R A ρ g {\displaystyle \tau ={\frac {RA}{\rho g}}}
Well
C/C++ specifier referring to constant expression
portmanteau of constant expression, first introduced in C++11. Prior to the introduction of constexpr, options for specifying compile-time constants and functions
Constexpr
Electronic circuit
ranges, the capacitor only needs to charge up to the peak value. The RC time constant is chosen to prevent a too rapid or a too slow discharge. The output
Envelope_detector
Device for acoustic measurements
circuit and thus it must have a time constant of integration; today referred to as the time-weighting. Three of these time-weightings have been internationally
Sound_level_meter
Use of particulate air monitors to assess radioactivity
reduces the air flow over time. The moving-filter collection medium (“tape”) is assumed to move across the deposition area at a constant, known rate. This rate
Airborne particulate radioactivity monitoring
Airborne_particulate_radioactivity_monitoring
Term in fluid dynamics
time constant of tracers becomes very small. In this way, tracer particles exactly follow the same path as the fluid does. Hydraulic residence time (HRT)
Residence_time
Hash function without any collisions
hash functions may be used to implement a lookup table with constant worst-case access time. A perfect hash function can, as any hash function, be used
Perfect_hash_function
Physical constant: Electric charge of one mole of electrons
In physical chemistry, the Faraday constant (symbol F, sometimes stylized as ℱ) is a physical constant defined as the quotient of the total electric charge
Faraday_constant
Low frequency audio feedback
the power supply voltage sagging as oscillations build up (the long time constant coming from the power supply reservoir capacitor) in such a way that
Motorboating_(electronics)
Phrase used in philosophy as a variant or near synonym for causality and induction
duration of time, we become convinced that A causes B. However, this position raises problems, as it seems that certain kinds of constant conjunction
Constant_conjunction
Medical imaging technique
called longitudinal or T1 relaxation and occurs exponentially with a time constant T1. The loss of phase coherence in the transverse plane is called transverse
Physics of magnetic resonance imaging
Physics_of_magnetic_resonance_imaging
an orienting force (such as flow, applied electric field, etc.). The time constant for relaxation of the axial direction vector is τ a x = ( 1 k B T )
Perrin_friction_factors
Method used in chemical kinetics
reciprocal of the time constant equals the sum of the two rate constants 1 / τ = k a + k b {\displaystyle 1/\tau =k_{a}+k_{b}} The two rate constants can be determined
Temperature_jump
Process in neuroscience
Their membrane time constants, stays short, so it does not let signals linger. Integrators are the opposite, with a long time constant. They accumulate
Summation_(neurophysiology)
Phenomenon whereby maximum average air temperature is delayed by a period of time
- WeatherWorks". www.weatherworksinc.com. 21 July 2014. "radiative time constant". PDS Atmospheres Node. Retrieved 2018-11-17. "Why is March colder than
Seasonal_lag
Seasonal change of clock settings
year. The time of day that individuals begin and end work or school, and the coordination of mass transit, for example, usually remain constant year-round
Daylight_saving_time
Physical constant with no units
In physics, a dimensionless physical constant is a physical constant that is dimensionless, i.e. a pure number having no units attached and having a numerical
Dimensionless physical constant
Dimensionless_physical_constant
TIME CONSTANT
TIME CONSTANT
Girl/Female
Danish, Dutch, German, Latin
War-like; Female Version of Martin; Follower of Christ
Surname or Lastname
English
English : patronymic from the personal name Timm.
Surname or Lastname
English (Northamptonshire)
English (Northamptonshire) : from the Old French form of the Latin personal name Titus. Compare Tito.French : from the Germanic personal name Tito, derived from theudo ‘people’, ‘race’.
Girl/Female
African, Arabic, French, Romanian, Russian
Goodness; Nice
Surname or Lastname
English
English : metonymic occupational name for a lime burner or for a whitewasher, from Old English līm ‘lime’.
Surname or Lastname
English
English : probably a variant of Timms.
Girl/Female
Hebrew
Without flaw.
Girl/Female
African, Australian, Swahili
Full of Happiness
Male
Finnish
Short form of Finnish Timofei, TIMO means "to honor God." Compare with other forms of Timo.
Surname or Lastname
English
English : from a female name Tezia, Teucia, Tietsa, pet forms of Continental Germanic compound names formed with the unattested element þēudo ‘people’, ‘race’.Americanized spelling of German Theiss or possibly Theus.Possibly an altered spelling of Dutch Tijs, from a short form of Matthijs, Dutch form of Matthew.
Surname or Lastname
Italian (Sicily; Tinè)
Italian (Sicily; Tinè) : most probably an occupational name for a comb maker, from a reduced form of medieval Greek kteneas, from ktenion ‘comb’ + the occupational suffix -eas.English (mainly Yorkshire) : variant of Tyne.Perhaps also an Americanized spelling of German Thein.
Surname or Lastname
Cambodian
Cambodian : unexplained.English : variant of Timm.
Male
Greek
(Τίμω) Short form of Greek Timon, TIMO means "honor." Compare with another form of Timo.
Male
English
Short form of English Timothy, TIMO means "to honor God." Compare with other forms of Timo.
Male
English
Short form of English Timothy, TIM means "to honor God."
Boy/Male
French, German, Latin
Much Loved
Female
Greek
(Τίμω) Feminine form of Greek Timon, TIMO means "honor." Compare with masculine Timo.
Biblical
headdress
Surname or Lastname
English
English : probably from an otherwise unrecorded Old English personal name, cognate with the attested Continental Germanic form Timmo. This is of uncertain origin, perhaps a short form of Dietmar. The personal name Timothy was not in use in England until Tudor times, and is therefore not a likely source of this surname, which is medieval in origin.North German and Dutch : from a short form of the medieval personal name Dietmar.
Boy/Male
Spanish
one who honors God.
TIME CONSTANT
TIME CONSTANT
Surname or Lastname
English (most frequent in northern Ireland)
English (most frequent in northern Ireland) : from Middle English fe(i)th ‘belief (especially Christian belief)’, ‘faithfulness’, ‘loyalty’. This may have been a nickname for a trustworthy person, but was more probably bestowed on one who used ‘Faith!’ frequently as a mild oath or exclamation.
Boy/Male
Arabic, French, Hebrew, Hindu, Indian, Indonesian, Marathi, Muslim, Parsi, Romanian, Sanskrit, Swedish, Telugu
Winner; Jewel; Ornament; Myth Name; Beginning; First Born; Adornment; Superior; First; More; Extra; Companion of Prophet Muhammad; Sun's Name
Girl/Female
Arabic, Bengali, Gujarati, Indian, Kannada, Muslim
Flourishing; Blossoming
Girl/Female
Indian
Moon
Male
Welsh
Welsh form of Latin Maxim, MAXEN means "the greatest rival."
Girl/Female
Afghan, Arabic, German, Gujarati, Hindu, Indian, Kannada, Kurdish, Malayalam, Marathi, Muslim, Parsi, Punjabi, Sikh, Sindhi
A Diamond; Adamant; Brightness
Boy/Male
American, Australian, British, Celtic, English, French, Gaelic, Indian, Irish, Jamaican, Scottish
Dweller in a Little Hollow; Small; Round Hill; Finnian's Servant; Log in Water to be Still and at Peace
Boy/Male
Indian
Laughter
Boy/Male
Muslim
Equitable
Girl/Female
Tamil
Welfare, Prosperity
TIME CONSTANT
TIME CONSTANT
TIME CONSTANT
TIME CONSTANT
TIME CONSTANT
v. t.
To cause to float with the tide; to drive or carry with the tide or stream.
imp. & p. p.
of Time
n.
A particular period or part of duration, whether past, present, or future; a point or portion of duration; as, the time was, or has been; the time is, or will be.
prep.
Time; period; season.
n.
The period at which any definite event occurred, or person lived; age; period; era; as, the Spanish Armada was destroyed in the time of Queen Elizabeth; -- often in the plural; as, ancient times; modern times.
v. t.
To regulate as to time; to accompany, or agree with, in time of movement.
v. t.
To appoint the time for; to bring, begin, or perform at the proper season or time; as, he timed his appearance rightly.
v. i.
To keep or beat time; to proceed or move in time.
n.
To pour a tide or flood.
v. t.
To ascertain or record the time, duration, or rate of; as, to time the speed of horses, or hours for workmen.
superl.
Deficient in spirit or animation; spiritless; dull; flat; insipid; as, a tame poem; tame scenery.
superl.
Reduced from a state of native wildness and shyness; accustomed to man; domesticated; domestic; as, a tame deer, a tame bird.
v. i.
To pass time; to delay.
n.
Performance or occurrence of an action or event, considered with reference to repetition; addition of a number to itself; repetition; as, to double cloth four times; four times four, or sixteen.
v. t.
To cover with tiles; as, to tile a house.
n.
The measured duration of sounds; measure; tempo; rate of movement; rhythmical division; as, common or triple time; the musician keeps good time.
pl.
of Time
n.
A proper time; a season; an opportunity.
v. t.
To treat with lime, or oxide or hydrate of calcium; to manure with lime; as, to lime hides for removing the hair; to lime sails in order to whiten them.
a.
Done at an improper time; ill-timed.