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Topic: Q factor

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Quality factor

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	Q factor - Wikipedia, the free encyclopedia
		In optics, the Q factor of a resonant cavity is given by
		The optical Q is equal to the ratio of the resonant frequency to the FWHM bandwidth of the cavity resonance.
		The average lifetime of a resonant photon in the cavity is proportional to the cavity's Q. If the Q factor of a laser's cavity is abruptly changed from a low value to a high one, the laser will emit a pulse of light that is much more intense than the laser's normal continuous output.
	en.wikipedia.org /wiki/Q_factor (612 words)

	Q - Wikipedia, the free encyclopedia
		In biochemistry, Q is the symbol for glutamine.
		In chemistry, Q is a symbol for the reaction quotient.
		Q is an acronym for "queer", an appropriation of the historically pejorative word, now used neutrally or positively by those who strongly reject traditional gender identities.
	en.wikipedia.org /wiki/Q (1265 words)

	Q Score - Wikipedia, the free encyclopedia
		The higher the Q Score, the more well-known and well thought of the item or person being scored is. The Q Score is primarily used by the marketing, advertising and public relations industries.
		Two factors influence the Q Score: the number of people who are aware of the product in question, and the number of people who claim that product as one of their favorites.
		Q Scores are calculated for the population as a whole as well as for demographic groups such as age, sex, income or education level.
	en.wikipedia.org /wiki/Q_Score (455 words)

	AN EXPERIMENTAL "Q" METER
		We can also express the Q factor of a capacitance as the ratio of its series reactance to its series resistance although capacitors are generally specified by the D or dissipation factor which is the reciprocal of Q. A tuned circuit, at resonance, is considered to have a Q factor.
		Finally, Q factor of a resonant circuit is equal to its voltage magnification factor and Q can also be expressed as the ratio of voltage developed across its reactive elements to the voltage injected in series with the circuit to produce the developed voltage.
		Q factor is calculated as the ratio of output voltage measured across the tuned circuit to that injected into it.
	www4.tpgi.com.au /users/ldbutler/QMeter.htm (3261 words)

	History of Q Methodology
		Q methodology was innovated by British physicist/psychologist William Stephenson (1902-1989), but has been applied and has continued to evolve primarily in the United States and outside academic psychology, most notably in the fields of communication and political science, and more recently in the health sciences.
		Hence, the conventional end of factor I agrees strongly with statements 11 and 13 and disagrees with 5 and 18, whereas the reverse is the case at the negative end of the factor.
		Moreover, the complementarity at issue in Q methodology, as in particle physics, is a function of measurement rather than a vague metaphor: It is the Q factors which are in a relationship of complementarity.
	facstaff.uww.edu /cottlec/QArchive/Bps.htm (5407 words)

	Medcyclopaedia - Q factor
		The Q factor refers to two characteristics of the transducer: the "purity" (bandwidth) of the sound and the persistence of the sound (the ring down time).
		Adding a backing block to an ultrasound transducer reduces the Q factor by shortening the ringdown time and consequently the pulse duration, which increases the bandwidth of the ultrasound pulse.
		Doppler ultrasound applications require transducers with higher Q factor to produce narrow bandwidth ultrasound which is needed for detection of the frequency changes caused by blood flow.
	www.medcyclopaedia.com /library/topics/volume_i/q/Q_FACTOR.aspx (446 words)

	Q-Methodology Primer I
		Q Samples In Part 2, it was noted that concourse comprises the raw materials for Q methodology, and for the human sciences generally insofar as they are concerned with life as it is lived, i.e., from the vantagepoint of the person involved.
		A factor score is the score for a statement as a kind of average of the scores given that statement by all of the Q sorts associated with the factor.
		Q methodology is a useful addition to the qualitative researcher's arsenal: it is simple to the point of elegance, well fortified with mathematics (which needn't be un- derstood), increasingly supported by computer software programs, and grounded in modern philosophical and scientific principles.
	facstaff.uww.edu /cottlec/QArchive/Primer1.html (8631 words)

	Hyperprism-DX Filters (Site not responding. Last check: 2007-10-02)
		The Q determines the sharpness of the response of the filter, corresponding to its degree of resonance.
		Q can be defined precisely for a band pass filter as the ratio of the center frequency to the spread of its -3 dB point (cutoff point) bandwidth.
		The Q factor can be increased to a very high value, in which case it generates a sinusoidal tone amplitude of which varies according to the input signal.
	www.arboretum.com /support/manuals/Hyperprism-DX-2.5-Manual-HTML/filters.HTM (1330 words)

	63xc.com--Stories \| Q for fixers
		Riding a bike is not the same as walking, but there are enough similarities between the two activities to suggest that low Q might be a good thing for your legs.
		So, reduced Q is a good thing for all riders, but especially for fixers.
		Q is one more reason to get a retro frame.
	www.63xc.com /willm/q.htm (621 words)

	Cluster vs. Q Factor (Site not responding. Last check: 2007-10-02)
		q factor analysis in personality and psychopathology research is a clustering procedure, but differs from what are typically called cluster analyses in two or three respects.
		From my point of view, the assessment use of Q sorts in psychology is as uncertain and human-constructed as uses of Q methodology when it is used to understand phenomena from the perspective of subjects.
		One of the aspects of Q methodology's helpful role in policy development [when people sort statements in order to discern factors] is the way in which the methodology is sensitive to changes among people over time and place.
	www.qmethod.org /Issues/cluster_vs_Q.htm (7576 words)

	Ocean 590 Abstracts (Site not responding. Last check: 2007-10-02)
		This factor is commonly used in semi-analytical reflectance inversion models to exploit the theoretical relationship between the irradiance reflectance R (Eu/Ed) and the inherent optical properties, specifically bb/a.
		The plots of Q as a function of wavelength for a series of depths ranging from.5 to 7m shows a slight spectral variation of Q at the surface, and the spectral shape of Q changing with each depth.
		The rapid decrease in Q at 683 may be explained by fluorescence, which is an inelastic process that emits light isotropically and thus would result in a Q value equal to p in the absence of other sources.
	www.ocean.washington.edu /courses/oc590/abstracts/jacobs.html (456 words)

	Q, Quality factor in horology
		Q is the energy that is stored in a pendulum divided by the energy that is dissipated during every period of oscillation:
		A high value of Q means a reduction of the force used to keep the pendulum in motion.
		It can be observed that Q increases in a relatively slow manner between the atmospheric pressure value (extreme right of the graph) up to about 0.1 mb.
	www.orologeria.com /english/magazine/magazine4.htm (240 words)

	The Q Method (Site not responding. Last check: 2007-10-02)
		Q method is a controlled technique for eliciting structures of subjectivity.
		Based on a factor analysis technique and a somewhat standardized protocol for data collection, Q reveals factors (or common patterns) of subjectivity, scoring individual subjectivities on their relationship/proximity to these more common patterns.
		Despite its long history, many unsettled issues remain in Q method, including determination of the numbers of factors in a population, the use of normalized distribution in Q-Sorts, and the question of minimum number of loaders/study subjects required for factor stability.
	www.apnet.com /refer/measure/Outlines/Q_method.htm (200 words)

	[No title]
		The purpose of factor analysis is to reduce multiple variables to a lesser number of underlying factors that are being measured by the variables.
		Applications of Factor Analysis (cont.) R and Q Factor Analysis R factor analysis involves extracting latent factors from among the variables Q factor analysis involves factoring the subjects vis-à-vis the variables.
		Factor I is assumed to be a latent factor that measures criminal history, while Factor II appears to measure educational/skill level.
	www.shsu.edu /~icc_cmf/newCJ742/9FACTORANALYSISnew.doc (2491 words)

	CIOS - (Site not responding. Last check: 2007-10-02)
		As a simple example, using a Q sort as data: The = formula M =3D Sum(X) / N tells us where the mean is located (usually at = zero for forced data), but it tells us nothing about the dispersion, = which may be leptokurtic, platykurtic, bimodal, or distributed in some = other way.
		Michael Pepperday has purposely = created Q sorts that have means in certain locations (e.g., a high mean = for the A-liberal statements but low means for the B, C, and D = statements), but correlation and factor analysis do not respond to mean = differences, but to dispersion.
		As a simple = example,=20 using a Q sort as data: The formula M =3D Sum(X) / N tells us = where the=20 mean is located (usually at zero for forced data), but it tells us = nothing=20 about the dispersion, which may be leptokurtic, platykurtic, bimodal, = or=20 distributed in some other way.
	www.cios.org /mailboxes/Q-method/09055191.001 (1947 words)

	Encyclopedia of Laser Physics and Technology - Q factor, quality factor, cavity, resonator, oscillator, high-Q ...
		The Q factor (quality factor) of a resonator is a measure for the strength of the damping of its oscillations, or for the relative linewidth.
		Definition via energy storage: The Q factor is 2π times the ratio of the stored energy to the energy dissipated per oscillation cycle, or equivalently the ratio of the stored energy to the energy dissipated per one radian of the oscillation.
		The Q factor then basically determines the precision with which the optical frequency of a laser can be stabilized to a cavity resonance.
	www.rp-photonics.com /q_factor.html (746 words)

	US Microwaves Application Note 104 - THIN FILM MICROSTRIP TRANSMISSION LINES
		Hence, Q is proportional to the net magnetic energy stored, which is equal to the difference between the peak magnetic and electric energies.
		The last term is the self-resonance factor describing the reduction in Q due to the increase in the peak electric energy with frequency and the vanishing of Q at the self-resonant frequency.
		The increase of the metal width results in a rise of Q because the resistance of the inductor decreases and the inductance remains the same.
	www.usmicrowaves.com /appnotes/usm_an_106.htm (796 words)

	ED231A: Q Factor Analysis
		Q factor analysis involves factoring observations rather than variables.
		In many ways, it is more similar to cluster analysis than it is to factor analysis.
		In this example, we will use the same data that was in one of the cluster analysis examples, eight dental variables on 32 species of mammals.
	www.gseis.ucla.edu /courses/ed231a1/output/qfac.html (126 words)

	Articles - Q factor (Site not responding. Last check: 2007-10-02)
		Systems with a high Q factor resonate with a greater amplitude (at the resonant frequency) than systems with a low Q factor.
		On a graph of response versus frequency, the bandwidth is defined as the 3 dB change in level (voltage, current, or power) on either side of the center frequency.
		Q = frac{sqrt{M K}}{R} where M is the mass, K is the spring constant, and R is the mechanical resistance.
	www.sinoz.com /articles/Q_factor (448 words)

	Car Audio : "Q" Factor in Clarion Head Unit
		Q factor in an EQ is the center frequency divided by the bandwidth.
		It determines the slope of the EQ curve at its peak, or the steepness of the "knee." Higher Q means you are controlling a narrower band with the boost or cut of the EQ.
		High Q is useful for cutting out particularly bothersome peaks or resonances, low Q works more like a traditional "bass" "midrange" and "treble" control.
	www.the12volt.com /installbay/forum_posts.asp?TID=58793&get=last (472 words)

	The Stavros' RF pendulum experiment by JL Naudin
		One of the major parameter is the Q factor of the tank circuit.
		I have also noticed that the heat sink of the BD827 transistor is only warm and doesn't become hot, this confirms that the efficiency of the circuit has been improved by the increase of the Q factor.
		The Q factor and also the shape of the transmission lines seems to have a major role in the effect.
	jnaudin.free.fr /html/stvrfpnd4.htm (727 words)

	joseph lambert
		The Q factor is one such property that tells how well a material conserves vibrational energy.
		Preliminary findings suggest that the Q value does not change within the errors of the experiment when metallic glass is heated past the crystallization point.
		Through there does not seem to be a significant chance in the Q value when heated, the resonant frequencies of the metallic glass increased significantly by a factor of approximately 1.5 and the time it took to damp down decreased significantly.
	www.willamette.edu /cla/scrp/students_2004/joseph_lambert.htm (259 words)

	TXU Electric Delivery - Electricity - Metering - FAQ (Site not responding. Last check: 2007-10-02)
		The power factor measurement that will be used for billing purposes is the average power factor for the 15 minutes during the peak demand and can not be determined by an instantaneous reading.
		The power factor measurement that will be used for billing purposes is the average power factor for the 15 minutes during the peak kW demand.
		Once TXU Electric Delivery begins implementing power factor billing adjustments, in order for a premise to qualify for implementation, power factor capable metering must be in place and functioning for at least one complete meter reading cycle and the premise must be qualified for implementation based on the plan to implement in descending demand order.
	www.oncorgroup.com /electricity/metering/power_factor/qa.asp (980 words)

	Rane Professional Audio Reference (Q)
		The selectivity factor defined to be the ratio of the center frequency f divided by the bandwidth BW.
		See the RaneNote Constant-Q Graphic Equalizers; also download "Bandwidth vs. Q Calculator" as a zipped Microsoft Excel spreadsheet in the Rane Library.
		QS Sansui's name for their quadraphonic sound system using a proprietary matrixing algorithm for encoding four-channel sound down to two-channels.
	www.rane.com /par-q.html (958 words)

	Commonwealth Sprague Power Factor Correction Q&A (Site not responding. Last check: 2007-10-02)
		A high power factor means that electrical power is being utilized effectively, while a low power factor indicates poor utilization of electrical power.
		In the example above, with a Power Factor of 80%, your paper mill would be utilizing only 80% of the energy supplied by the utility.
		The simplest way to improve power factor is to add power factor correction capacitors to your plant distribution system.
	www.comsprague.com /power2.htm (459 words)

	SuperMemo 2: Algorithm
		Having observed that subsequent inter-repetition intervals are increasing by an approximately constant factor (e.g.
		EF - easiness factor reflecting the easiness of memorizing and retaining a given item in memory (later called the E-Factor).
		This means that E-Factors did not change significantly after that period and it is safe to presume that E-Factors correspond roughly to the real factor by which the inter-repetition intervals should increase in successive repetitions.
	www.supermemo.com /english/ol/sm2.htm (991 words)

	Forbes.com: Infiniti's Q Factor (Site not responding. Last check: 2007-10-02)
		What we found is a car that is faster than any other in its class (0 to 60 mph in 5.9 seconds) and one with a class-leading cockpit in terms of both amenities and capacity.
		The car is also designed to take on Audi's $62,000 entry-level A8, and the Q is both faster to 60mph than that car and is appointed just as sumptuously.
		Speaking of which, the amenities in the Q are extraordinary.
	www.forbes.com /2001/02/05/0205feata.html (838 words)

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