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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
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
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
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
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
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
Universal and unchanging physical quantity
parameters assumed to be constant in specialized models without being universal constants. Examples include the characteristic time, characteristic length
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
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
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
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
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 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
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
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
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
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
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
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 is, as an open-loop gain given by: A O L = A 0 1 + j ω τ , {\displaystyle
Step_response
Generates a forecast of future values of a time series
T} is the sampling time interval of the discrete time implementation. If the sampling time is fast compared to the time constant ( Δ T ≪ τ {\displaystyle
Exponential_smoothing
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
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
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
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)
pole due to the added input resistance Ri and capacitance Ci, with the time constant Ci ( RA || Ri ). This pole is lowered in frequency by the Miller effect
Pole_splitting
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
Delayed temperature response
spatial-temporal behavior of a system during transient heat transfers. A time constant is then sometimes appropriately used as a simple parametrization for
Thermal_inertia
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
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)
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
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
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
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)
Field of mathematical control theory
time constants," the upshot of which is that there is no particular time constant, or resonance frequency for the system. In fact, the fractional integral
Fractional-order_control
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
Form of synaptic inhibition mediated by increased membrane conductance
membrane conductance, which can decrease input resistance and the membrane time constant, causing coincident excitatory currents to be “shunted” but not necessarily
Shunting_inhibition
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)
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
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
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)
Chemical property
Stability constants, formation constants, binding constants, association constants and dissociation constants are all types of equilibrium constants. For a
Equilibrium_constant
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
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
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
Swiss-French politician and writer (1767–1830)
Henri-Benjamin Constant de Rebecque (25 October 1767 – 8 December 1830), or simply Benjamin Constant, was a Swiss and French political thinker, activist
Benjamin_Constant
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
Recurringly observed geometric pattern
A form constant is one of several geometric patterns which are recurringly observed during hypnagogia, hallucinations and altered states of consciousness
Form_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
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
Topics referred to by the same term
math and sciences where variables are time-constant Steady flow, a condition of flow that does not change with time Steady B (1969–present; stage name)
Steady
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
Adaptive optics optimization freuqency
Greenwood or atmospheric time constant (τ0). Since the distortions are approximately constant over a period less than this time constant, adapting the optical
Greenwood_frequency
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
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
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
Electronic circuit
resistance plus a resistor in the emitter, FET channel resistance), the Lp/R time constant causes the magnetizing current to be a rising curve with continually
Blocking_oscillator
Voice coding method
reference sample) is normally realized as a leaky integrator with a time constant ( τ {\displaystyle \tau } ) of about 1 ms. The decoder reverses this
Continuously variable slope delta modulation
Continuously_variable_slope_delta_modulation
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
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
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
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
allows specifically to estimate the order n of the studied system, its time constant and its delay. To use the Strejc method, it is necessary to apply a
Strejc_method
Energy driving the accelerated expansion of the universe
densities that vary in time and space) such as quintessence or moduli. A cosmological constant would remain constant across time and space, while scalar
Dark_energy
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
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
Proposed mode of space travel
travel under constant acceleration is a hypothetical method of space travel that involves the use of a propulsion system that generates a constant acceleration
Space travel under constant acceleration
Space_travel_under_constant_acceleration
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
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