* Q is the Q factor

In addition to causing power loss, in resonant circuits this can reduce the Q factor of the circuit, broadening the bandwidth.

The quality factor ( or Q ) of an inductor is the ratio of its inductive reactance to its resistance at a given frequency, and is a measure of its efficiency.

The higher the Q factor of the inductor, the closer it approaches the behavior of an ideal, lossless, inductor.

In a Q-switched laser, the population inversion is allowed to build up by introducing loss inside the resonator which exceeds the gain of the medium ; this can also be described as a reduction of the quality factor or ' Q ' of the cavity.

# Q protein then binds and displaces part of the σ factor and transcription re-initiates.

Operating at a lower frequency, IF filters can give narrower passbands at the same Q factor than an equivalent RF filter.

* burning demonstration: reproducible achievement of some fusion energy release ( not necessarily a Q factor of > 1 ).

A major reason for the wide use of crystal oscillators is their high Q factor.

The linewidth is inversely proportional to the Q factor, which is a measure of the sharpness of the resonance.

The quality factor or Q factor is a dimensionless parameter that describes how under-damped an oscillator or resonator is, or equivalently, characterizes a resonator's bandwidth relative to its center frequency.

* Q factor

Other all-pole second-order filters may roll off at different rates initially depending on their Q factor, but approach the same final rate of 12 dB per octave ; as with the first-order filters, zeroes in the transfer function can change the high-frequency asymptote.

Nor need there be an upper bound on the orders of elements in a torsion group if it isn't finitely generated, as the example of the factor group Q / Z shows.

Here Q is the molar activation energy, R is the ideal gas constant, T is absolute temperature, and K < sub > 0 </ sub > is a material dependent factor.

This attenuation inside the cavity corresponds to a decrease in the Q factor or quality factor of the optical resonator.

A high Q factor corresponds to low resonator losses per roundtrip, and vice versa.

; Class Q: Planets with continually changing environments caused by peculiar orbits, an orbit around a variable output star, or some other factor which causes conditions to drastically change over time.

If the reflectivity is high, resulting in a high Q factor ( i. e. high finesse ), monochromatic light produces a set of narrow bright rings against a dark background.

with t the day of calculation ; N the number of constituent shares in the index ( usually 40 ); Q < sub > i, t </ sub > the number of shares of company i on day t ; F < sub > i, t </ sub > the free float factor of share i ; f < sub > i, t </ sub > the capping factor of share i ( exactly 1 for all companies not subject to the 15 % cap ); C < sub > i, t </ sub > the price of share i on day t ; Q < sub > i, 0 </ sub > the number of shares of company i on the index base date ; C < sub > i, 0 </ sub > the price of equity i on the index base date ; and K < sub > t </ sub > the " adjustment coefficient for base capitalization " on day t ( reflecting the switch from the French franc to the Euro in 1999 ).

A well designed air core inductor may have a Q of several hundred.

An almost ideal inductor ( Q approaching infinity ) can be created by immersing a coil made from a superconducting alloy in liquid helium or liquid nitrogen.

In a parallel LC circuit where the main loss is the resistance of the inductor, R, in series with the inductance, L, Q is as in the series circuit.

This is a common circumstance for resonators, where limiting the resistance of the inductor to improve Q and narrow the bandwidth is the desired result.

The Q of an inductor with a series loss resistance is the same as the Q of a resonant circuit using that inductor with a perfect capacitor:

The Q of a capacitor with a series loss resistance is the same as the Q of a resonant circuit using that capacitor with a perfect inductor:

In general, the Q of a resonator involving a capacitor and an inductor can be determined from the Q values of the components, whether their losses come from series resistance or otherwise:

Sometimes, with very high Q tuned circuits an inductor is placed in series with the resistor to increase the source impedance of the control voltage so as not to load the tuned circuit and decrease its Q.

This lumped model works successfully at low frequencies but falls apart at high frequencies where the usual practice is to simply measure ( or specify ) an overall Q for the inductor without associating a specific equivalent circuit.

Q factor, which is related to ESR and is sometimes a more convenient parameter than ESR to use in calculations of high-frequency non-ideal performance of real inductors, is quoted in inductor data sheets.

The ferrite bead is effectively an inductor with a very small Q factor.

If X is defined as being positive for an inductor and negative for a capacitor then we can remove the modulus signs from Q and X and get

Therefore each binomial trial can be thought of as producing a value of a random variable associated with that trial and taking the values 0 and 1, with probabilities Q and P respectively.

Near Q, both curves can be represented by analytic functions of U.

Furthermore, one can find a neighborhood of Q in which the difference function is monotone, for since it is analytic it can have only a finite number of extrema in any interval.

Thus if E is sufficiently small, there can be only one intersection of C and Af near Q, for if there were more than one intersection for every E then the difference between C and Af near Q would not be a monotone function.

We observe first that no line, l, can meet its image except at one of its intersections with Q.

Moreover, from the definitive transformation of intercepts on the generators of Af, it is clear that the only points of Q at which a line can meet its image are the points of Aj.

The sum, difference, product and quotient of two algebraic numbers is again algebraic ( this fact can be demonstrated using the resultant ), and the algebraic numbers therefore form a field, sometimes denoted by A ( which may also denote the adele ring ) or < span style =" text-decoration: overline ;"> Q </ span >.

Thus, intuitionists are ready to accept a statement of the form " P or Q " as true only if we can prove P or if we can prove Q:

Division of whole numbers can be thought of as a function ; if Z is the set of integers, N < sup >+</ sup > is the set of natural numbers ( except for zero ), and Q is the set of rational numbers, then division is a binary function from Z and N < sup >+</ sup > to Q.

In the diagram, the “ working body ” ( system ), a term introduced by Clausius in 1850, can be any fluid or vapor body through which heat Q can be introduced or transmitted to produce work.

The Q number, which can be can be any positive integer, specifies the number of triangles, composed of asymmetric subunits, that make up the 10 triangles of the cylinder.

Now we can replace all occurrences of Q inside the provable formula by some other formula dependent on the same variables, and we will still get a provable formula.

* There are two additional 8-bit accumulators, E and F. These can be concatenated to form a 16-bit accumulator called W. The existing 6809 16-bit accumulator, D, can also be concatenated with W to form a 32-bit accumulator Q.