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Topic: Quality factor

	Q factor - Wikipedia, the free encyclopedia
		The Q factor or quality factor is a measure of the "quality" of a resonant system.
		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.
	en.wikipedia.org /wiki/Q_factor (436 words)

	Quality factor
		The quality factor was introduced to define the dose equivalent based on the fact that the probability of stochastic radiation effects not only depends on the absorbed dose but also on the radiation type.
		The quality factor considers the influence of the different energy distribution - which varies according to the different types of rays - in the cellular area in the irradiated body.
		Quality factor Q is a function of the unrestricted linear energy transfer L. The following relation has been fixed between the quality factor and the unrestricted linear energy transfer L: Unrestricted linear energy transfer L in water, (keV µm
	www.euronuclear.org /info/encyclopedia/q/quality-factor.htm (123 words)

	EPA-OAQPS - Introduction to Emission Factors
		An emission factor is a representative value that attempts to relate the quantity of a pollutant released to the atmosphere with an activity associated with the release of that pollutant.
		Factors noted as being influenced by control technology do not necessarily reflect the best available or state-of-the-art controls, but rather reflect the level of (typical) control for which data were available at the time the information was published.
		Whenever factors are used, one should be aware of their limitations in accurately representing a particular facility, and the risks of using emission factors in such situations should be evaluated against the costs of further testing or analyses.
	www.epa.gov /oar/oaqps/efactors.html (2391 words)

	Quality factor tuning system for a tunable filter and current rectifier used therein - Patent 5471168 (Site not responding. Last check: 2007-09-22)
		The quality factor of a filter is an important parameter as it determines for instance the bandwidth of the filter.
		Indeed, since it is well known in filter theory that the quality factor is determined by the damping and since obviously this damping is nothing else than the dissipation of energy in the filter and hence a loss of gain, there is a relation between the gain and the quality factor.
		It allows a measurement of the quality factor Q by simply measuring the passband gain G of the slave filter BIQUAD included in the tuning system and allows this quality factor to be tuned to a desired value by tuning the passband gain so as to achieve a corresponding desired gain value.
	www.freepatentsonline.com /5471168.html (7553 words)

	Quality Factor (Site not responding. Last check: 2007-09-22)
		Quality Factor is the ratio of inductance to leakage inductance.
		The extremely high factor allows these transformers to be used in a very wide range of input and output impedance.
		High Quality Factor is the key to the PAT series' unparalleled bandwidth.
	www.plitron.com /Pages/Products/Audio/quality.htm (55 words)

	Quality Factor
		The peak is associated with a molecular dipolar rotation and occurs when the rotational mobility of molecule rotation can just keep up with the alterations of the electric field, sort of a molecular resonance condition in the dielectric material.
		In any case the peak should occur well away from the frequency that is being employed and should remain stable through the usable lifetime of the dielectric material.
		The trend of dissipation factor is an indicator of how well a dielectric material is aging.
	www.ecadusa.com /quality_factor.htm (503 words)

	Digital equalizer capable of varying the center frequency, quality factor, and gain to perform various frequency ... (Site not responding. Last check: 2007-09-22)
		When a digital filter is designed using the equations (15) and (16), a band-pass filter characteristic comprising a center frequency determined by.omega..sub.c and the quality factor Q determined by the equation (11), and a band-elimination filter characteristic comprising a center frequency determined by.omega..sub.c and the quality factor Q determined by the equation (12) is obtained.
		Furthermore, from the relation.omega..sub.i /2.sigma..sub.i (where i=1 or 2), the quality factor Q is simply specified, and, by the relation.sigma..sub.2 /.sigma..sub.i, the gain G is determined, and, at the same time, Q and G are varied.
		The frequency characteristic for when the quality factor Q is 1.5 is shown by the curve I, and when the quality factor Q is 3 and 12, they are respectively shown by the curves II and III, of FIG.
	www.freepatentsonline.com /4524422.html (4054 words)

	MARINELAND.COM - DR. TIM'S LIBRARY (Site not responding. Last check: 2007-09-22)
		For instance, a tank with no ammonia and nitrite may, on the surface, seem to have good water quality but when, upon further inspection, dissolved oxygen is found to be zero, one has to conclude that the water quality is actually extremely poor, especially since the fish are probably dead.
		Thus, to be water quality aware requires a basic knowledge about what the various water quality characteristic are and how they affect the organisms in the aquarium.
		Below is a short introduction to the major water quality factors of principal concern for an aquarium.
	www.marineland.com /reports/11WaterQual.asp (2677 words)

	ADOPT-FIT's Quality Factor Tool (Site not responding. Last check: 2007-09-22)
		When random variations, usage and drift are accounted for, the normal or expected quality factor will be in the range of 9 to 11.
		Factors of 8 and below would indicate that the particular channel has variations that are beyond normal expectations and may require further analysis.
		In some instances, it may be appropriate for quality factor alarms to be sent to business units to alert them of an irregular reading at a customer site.
	www.adoptfit.com /quality.htm (457 words)

	MODELING THE EFFECTS OF REFINER OPERATION
		Factor network analysis is a new variation of factor analysis which has been used to analyze paper machine operation (1, 2).
		Factor analysis is a data reduction technique which can be used to analyze a large number of interrelated variables.
		The number of common factors is always less than the number of variables analyzed and if there is a high degree of correlation among the variables, the number of common factors required will be small.
	www.pacsim.com /Articles/Refiner/Refiner.HTM (3858 words)

	Quality factor, effective
		The Radiological Protection Ordinance of 1989 uses the quality factor Q or the effective quality factor Q
		The effective quality factor considers the probability of stochastic radiation effects, depending on the respective radiation type.
		In the case of external whole-body irradiation and generally also for other exposure conditions the following values may be used for the effective quality factor Q
	www.euronuclear.org /info/encyclopedia/q/quality-factor-effective.htm (105 words)

	Time and Frequency from A to Z
		The quality factor, Q, of an oscillator is defined as its resonance frequency divided by its resonance width.
		Obviously a high resonance frequency and a narrow resonance width are both advantages when seeking a high Q. Generally speaking, the higher the Q, the more stable the oscillator, since a high Q means that an oscillator will stay close to its natural resonance frequency.
		A type of oscillator noise caused by environmental factors such as mechanical shock, vibration and temperature fluctuations which cause random shifts in frequency.
	www.boulder.nist.gov /timefreq/general/enc-q.htm (500 words)

	[No title] (Site not responding. Last check: 2007-09-22)
		The "quality factor" is the amount by which quantization tables are scaled to adjust image quality.
		The quality factor lets you trade off compressed file size against quality of the reconstructed image: the higher the quality setting, the larger the JPEG file, and the closer the output image will be to the original input.
		The tables are implicitly numbered 0,1,etc. If a non-zero quality factor is also specified, the values in the file are scaled according to a quality scaling curve.
	accad.osu.edu /~tdaoust/skiproject-lite/ifl/include/ifl/iflJFIF.h (1098 words)

	Radiosurgical Quality Factor: Quantitatively Comparing Gamma Knife, IMRT and Linac Radiosurgical Plans
		A quality factor to quantitatively compare the dosimetry of Gamma Knife radiosurgery and intensity-modulated radiation therapy as a function of target volume and shape.
		For small round targets the Gamma Knife quality factor is superior for both QF and QF (Figures 1 and 2).
		The quality factor of the 12 Gy volume, QF, is readily computed from the dose volume histogram curve.
	www.jonathanborden-md.com /GK%20dosimetry.html (2398 words)

	INFO: Determine the JPEG Quality Factor by Using Visual C# .NET
		The JPEG quality factor is used to generate a pair of quantization tables.
		For more information about how the quality factor is used to influence the quantization tables, see the JPEG specification and the IJG reference code, both of which are available through the "References" section of this article.
		The quality factor is not stored directly in the JPEG file, so you cannot read the quality factor from the file.
	support.microsoft.com /?id=324790 (501 words)

	[No title] (Site not responding. Last check: 2007-09-22)
		Quality factor analysis (QFA) a new clinic ultra-sensitive acoustic technique for prediction of bone strength and fracture risk with application to osteoporosis/hassan Abbasi jahromi; Supervised by:Dimargonas.
		For the assessment of bone fracture risk and in order to estimate bone quality, we have developed a noninvasive method of Bone Quality Factor Analysis BQFA, which estimates the quality factor by vibration excitation of the bone in the form of an acoustic sweep signal applied to bones in vitro and/or in vivo.
		Quality factor defined as the ratio of maximum strain energy and dissipated energy in one cycle of deformation is a direct function of bone connectivity and elasticity and is inversely related to the presence of microfractures.
	dbase.irandoc.ac.ir /00231/00231681.htm (233 words)

	Quality Factor
		The quality factor (Q), also often called Performance Ratio, describes the relationship between the actual yield and the target yield of a photovoltaic system.
		The performance ratio of a photovoltaic system is the quotient of alternating current (AC) yield and the nominal yield of the generator’s direct current (DC).
		Another example is a Solar Module based on crystalline cells, which can even reach a quality factor of 0.85 to 0.95.
	www.solar-server.com /lexikon/qualitaetsfaktor-e.html (100 words)

	Quality Factor - Firesmith OPEN Process Framework (OPF) Website
		Quality Team, which documents the quality factors in the quality plan.
		Requirements Team, which uses the quality factors to analyze quality requirements and specify them in the system requirements specification.
		The quality factors drive the quality goals, which drive the quality requirements, which drive the quality architectural mechanisms, which drive the quality tests.
	www.donald-firesmith.com /Components/WorkProducts/ModelSet/QualityModel/QualityFactors/QualityFactors.html (163 words)

	Quality Factor and Intermodulation Product of Superconducting Coplanar Wave Guides with Slots in a DC Magnetic Field ...
		The calculated and measured quality factors are in good agreement at low power and zero external magnetic field perpendicular to the film.
		The influence of moats or slots in the CPW stripes on the measured quality factor and intermodulation...
		2 Quality factors of coplanar niobium resonators on LaAlO 3 su..
	citeseer.ist.psu.edu /428635.html (361 words)

	JPEG Tutorial --The Society for Imaging Science and Technology
		The results use different quality factors and smoothing factors; zero smoothing and 100 % quality yield the least distortion.
		Table 1 compares the quality factor with the compression ratio (including overhead) for the color and b/w images.
		Quality Factor of 75, the Difference Picture (75).
	www.imaging.org /resources/jpegtutorial/jpgimag1.cfm (192 words)

	Filter using enhanced quality factor resonator and method - US Patent 5617065 (Site not responding. Last check: 2007-09-22)
		These structures have the advantages of being extremely compact and of providing narrow bandwidth (i.e., high quality factor) frequency selection components that are light weight and which do not require adjustment over the life of the component.
		Problems encountered with such devices include reduced Q or quality factor due to at least two causes: (i) reduced quality factor of materials employed for the piezoelectric element and (ii) reduced quality factor for the composite resonator owing to the contributions of the metallizations forming the electrodes.
		Two elements of high quality factor resonator structure 15 increase the quality factor above that obtainable by prior art techniques: (i) utilizing single-crystal material for resonator layer 150 and (ii) separating resonator layer 150 from bottom electrode 159 by the small gap therebetween.
	www.patentstorm.us /patents/5617065.html (7750 words)

	Improved Quality as a Contributing Factor to Economic Growth: A Problem of Measurement (Site not responding. Last check: 2007-09-22)
		The first was the discussion of the quality factor in growth measurement concerning the former command economies of Eastern Europe.
		The aims of this paper are to sketch the history of quality measurement problems in the OECD and in the former Eastern Europe and also in new transition economies and to try to find proper statistical indicators to profile the problem in terms of economic theory.
		The main results to be expected are the clarification of the role of quality adjustment as a source of variation in growth measurements concerning Eastern Europe and especially the Soviet Union and showing the main differences in assessing the quality factor in the statistical practices of the USA and in the EU.
	www.iaes.org /conferences/past/boston_46/prelim_program/o40-1/ruoho.htm (528 words)

	Untitled
		Any factor that may influence a user's perception of the desirability of a product could be included as a quality factor; therefore, we must narrow our scope to those factors upon which we may want to place first priority.
		The focus of this presentation is upon the factors that currently limit pork consumption because they affect utilization at the processor level or are a direct limiting factor on consumer demand for your product.
		Early postmortem prediction of meat quality would be desirable in situations where it is important to feedback quality information to producers and in situations where carcasses could be sorted into quality groups when going into the chill coolers.
	mark.asci.ncsu.edu /nsif/98proc/forrest.htm (2807 words)

	2aSA1. Effects of transducer mass on resonance frequency and quality factor of free--free bars. (Site not responding. Last check: 2007-09-22)
		Effects of transducer mass on resonance frequency and quality factor of free--free bars.
		The preferred excitation and detection method is based on electrodynamic transduction in which a coil of wire is attached to each bar end, which in turn is subjected to a strong magnetic field.
		The effect of the added transducer mass on the observed resonant frequency and quality factors of longitudinally driven bars used to determine Young's modulus and damping will be reported.
	www.auditory.org /asamtgs/asa97pen/2aSA/2aSA1.html (169 words)

	Journal of Materials Research 1999 (Site not responding. Last check: 2007-09-22)
		The average long-range ordering parameter for undoped BMT ceramics was 0.81 ± 0.03, and the corresponding average quality factor and resonant frequency product (Qd Ä fo) was 147,000 ± 3800 GHz.
		The results suggest that B-site cations ordering is not a primary factor that influences the observed microwave loss in BMT ceramics.
		The influence of atomic level point defects, induced from raw material impurities, processing, etc., may be more important in controlling the quality factor of BMT ceramics.
	www.mrs.org /publications/jmr/jmra/1999/nov/022.html (213 words)

	HS Quality Win Factor
		A quality win is defined as defeating a team rated in the top 250 national computer ratings.
		The quality points vary from 1.0 for defeating the number one ranked teams to.004 for defeating the 250th ranked team.
		Also teams which make the state championship game earn 0.5 quality points and the state champion receives an additional 1.0 point.
	www.laxpower.com /update02/binboy/qwf93.php (133 words)

	Method to trap air at the silicon substrate for improving the quality factor of RF inductors in CMOS technology - US ... (Site not responding. Last check: 2007-09-22)
		The incorporation of RF inductors on silicon without sacrificing the quality factor (Q) due to substrate losses has been researched heavily in recent years.
		The common objectives of all of these techniques are: 1) to enhance the Q value of the inductor and 2) to increase the self-resonance frequency so that the usable frequency range of the inductor is widened.
		While the invention has been particularly shown and described with reference to the preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the invention.
	www.patentstorm.us /patents/6221727.html (2901 words)

	1pPA4 Thermoacoustic enhancement and control of the quality factor in a (Site not responding. Last check: 2007-09-22)
		Thermoacoustic enhancement and control of the quality factor in a resonant photoacoustic cell for measurement of light absorption by aerosols and gases.
		Induced pressure is proportional to laser irradiance, to absorption coefficient of aerosol and/or absorbing gas species, and to resonator quality factor, Q.
		Thermoacoustics is the interaction of heat and sound in resonators containing thin plates separated by a distance proportional to the thermal penetration depth of the gas.
	www.auditory.org /asamtgs/asa94mit/1pPA/1pPA4.html (238 words)

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