Dark Mirror or The Dark Mirror may refer to In literature Dark Mirror Angel novel Dark Mirror Angel novel , an original novel based on the American TV series Angel Dark Mirror Star Trek novel Dark Mirror Star Trek novel , a novel by Diane Duane The Dark Mirror Marillier novel The Dark Mirror Marillier novel , a historical fantasy in the Bridei Chronicles series by Juliet Marillier X Men Dark Mirror , a novel by Marjorie M. Liu Dark Mirror , a short story by R. A. Salvatore Short stories R. A. Salvatore In film The Dark Mirror 1920 film The Dark Mirror 1920 film , a silent drama starring Dorothy Dalton The Dark Mirror film The Dark Mirror film , a 1946 psychological thriller directed by Robert Siodmak starring Olivia de Havilland Dark Mirror 1984 film Dark Mirror 1984 film , a TV film starring Stephen Collins Dark Mirror film Dark Mirror film , a film directed by Pablo Proenza, starring Lisa Vidal In other media Syphon Filter Dark Mirror , a 2006 2007 PlayStation Portable and Playstation 2 video game See also Black mirror disambiguation disambig ... more details
Tanh sinh quadrature is a method for numerical integration introduced by Hidetosi Takahasi and Masatake ... pi sinh kh . math Like Gaussian quadrature , tanh sinh quadrature is well suited for arbitrary precision ... of correct digits. Tanh sinh quadrature is less efficient than Gaussian quadrature for smooth integrands, but unlike Gaussian quadrature tends to work equally well with integrands having singularities ... log n for Gaussian quadrature. Upon comparing the scheme to Gaussian quadrature and error function quadrature , Bailey et al. 2005 found that the tanh sinh scheme appears to be the best for integrands ... research on tanh sinh quadrature, Gaussian quadrature and error function quadrature, as well as several of the classical quadrature methods, and found that the classical methods are not competitive ... paper July 2004 comparing tanh sinh quadrature with Gaussian quadrature and error function quadrature ... excellent accuracy with fast run times. It is the nearest we have to a truly all purpose quadrature scheme at the present time . Bailey 2006 found that The tanh sinh quadrature scheme is the fastest known high precision quadrature scheme , especially when the time for computing abscissas and weights is considered. It has been successfully employed for quadrature calculations of up to 20,000 ... sinh.pdf Tanh Sinh High Precision Quadrature . 2006 . Pascal Molin, http tel.archives ouvertes.fr tel ... A comparison of three high precision quadrature schemes . Experimental Mathematics , 14.3 2005 ..., ftp ftp.inria.fr INRIA publication publi pdf RR RR 5281.pdf A Comparison of Three High Precision Quadrature ... publication place New York isbn 978 0 521 88068 8 chapter Section 4.5. Quadrature by Variable Transformation ... 2011 10 27 tanh sinh quadrature v2 1 Tanh Sinh Quadrature V2.1 A Microsoft Excel workbook containing three functions for performing Tanh Sinh, Gauss Kronrod quadrature formula ... methods in general, all of which are members of the family of double exponential quadrature techniques ... more details
Unreferenced stub auto yes date December 2009 A cold mirror is a specialized dielectric mirror , a dichroic filter , that reflects the entire visible light spectrum while very efficiently transmitting infrared wavelength s. Similar to hot mirror s, cold mirrors can be designed for an incidence angle ranging between zero and 45 degrees, and are constructed with multi layer dielectric thin film coatings , in a manner similar to interference filter s. Cold mirrors can be employed as dichroic beamsplitter s with laser systems to reflect visible light wavelengths while transmitting infrared. See also Mirror DEFAULTSORT Cold Mirror Category Mirrors optics stub ar ja ... more details
File Gauss Hermite quadrature weights.svg thumb Weights versus x sub i sub for four choices of n In numerical analysis , Gauss Hermite quadrature is an extension of Gaussian quadrature method for approximating the value of integrals of the following kind math int infty infty e x 2 f x ,dx. math In this case math int infty infty e x 2 f x ,dx approx sum i 1 n w i f x i math where n is the number of sample points to use for the approximation. The x sub i sub are the roots of the physicists Hermite polynomial H sub n sub x i 1,2,..., n and the associated weights w sub i sub are given by ref name AS Abramowitz and Stegun Abramowitz, M & Stegun, I A, Handbook of Mathematical Functions , 10th printing with corrections 1972 , Dover, ISBN 978 0 486 61272 0. Equation 25.4.46. ref math w i frac 2 n 1 n sqrt pi n 2 H n 1 x i 2 . math References references Further reading http dlmf.nist.gov 3.5 P6 3.5. Quadrature Gauss Hermite Formula at the Digital Library of Mathematical Functions For tables of Gauss Hermite abscissae and weights up to order n 32 see http www.efunda.com math num integration findgausshermite.cfm. External links http people.sc.fsu.edu jburkardt cpp src gen hermite rule gen hermite rule.html Generalized Gauss Hermite quadrature , free software in C , Fortran, and Matlab Category Numerical integration quadrature ... more details
In numerical analysis Chebyshev Gauss quadrature is an extension of Gaussian quadrature method for approximating the value of integrals of the following kind math int 1 1 frac f x sqrt 1 x 2 ,dx math and math int 1 1 sqrt 1 x 2 g x ,dx. math In the first case math int 1 1 frac f x sqrt 1 x 2 ,dx approx sum i 1 n w i f x i math where math x i cos left frac 2i 1 2n pi right math and the weight math w i frac pi n . math ref name AS1 Abramowitz, M & Stegun, I A, Handbook of Mathematical Functions , 10th printing with corrections 1972 , Dover, ISBN 978 0 486 61272 0. Equation 25.4.38. ref In the second case math int 1 1 sqrt 1 x 2 g x ,dx approx sum i 1 n w i g x i math where math x i cos left frac i n 1 pi right math and the weight math w i frac pi n 1 sin 2 left frac i n 1 pi right . , math ref name AS2 Abramowitz, M & Stegun, I A, Handbook of Mathematical Functions , 10th printing with corrections 1972 , Dover, ISBN 978 0 486 61272 0. Equation 25.4.40. ref See also Chebyshev nodes References references External links http mathworld.wolfram.com Chebyshev GaussQuadrature.html Chebyshev Gauss Quadrature from Wolfram MathWorld http people.sc.fsu.edu jburkardt cpp src chebyshev1 rule chebyshev1 rule.html Gauss Chebyshev type 1 quadrature and http people.sc.fsu.edu jburkardt cpp src chebyshev2 rule chebyshev2 rule.html Gauss Chebyshev type 2 quadrature , free software in C , Fortran, and Matlab. Category Numerical integration quadrature ... more details
In numerical mathematics , the Gauss Kronrod quadrature formula is a method for numerical integration calculating approximate values of integral s . Gauss Kronrod quadrature is a variant of Gaussian quadrature , in which the evaluation points are chosen so that an accurate approximation can be computed by re using the information produced by the computation of a less accurate approximation. It is an example of what is called a nested quadrature rule for the same set of function evaluation points, it has two quadrature rules, one higher order and one lower order the latter called an embedded rule . The difference between these two approximations is used to estimate the calculational error of the integration. These formulas are named after Alexander Kronrod , who invented them in the 1960s, and Carl Friedrich Gauss . Gauss Kronrod quadrature is used in the QUADPACK library, the GNU Scientific Library , the NAG Numerical Libraries and R programming language R . ref http stat.ethz.ch R manual R patched library stats html integrate.html http stat.ethz.ch R manual R patched library stats html ... point Gaussian quadrature math int a b f x ,dx approx sum i 1 n w i f x i . math where w sub i sub ... must be evaluated at every point. Gauss Kronrod formulas are extensions of the Gauss quadrature ... order estimate. The difference between a Gauss quadrature rule and its Kronrod extension are often ... are incorporated into the Kronrod points, a total of only 15 function evaluations yields both a quadrature ... Curtis quadrature , another nested quadrature rule with similar accuracy Notes Reflist References eom ... link Alexander Kronrod title Nodes and weights of quadrature formulas. Sixteen place tables year 1965 ... citation last Patterson first T. N. L. title The Optimum Addition of Points to Quadrature ... http www.advanpix.com 2011 11 07 gauss kronrod quadrature nodes weights Arbitrary precision Gauss ... quadrature ... more details
the colors seen. In a dichroic mirror or filter, instead of using an oil film to produce the interference ...mergewith interference filter date March 2011 Image Dichroic filters.jpg thumb right 300px Dichroic filters A dichroic filter , thin film filter , or interference filter is a very accurate color Filter optics filter used to selectively pass light of a small range of colors while Reflection physics reflecting other colors. By comparison, dichroic mirrors and dichroic reflectors tend to be characterized by the color s of light that they reflect, rather than the color s they pass. See dichroism for the etymology of the term. Used before a light source, a dichroic filter produces light that is Perception perceived by humans to be highly saturation color theory saturated intense in color. Although costly, such filters are popular in architecture architectural ref http www.operaen.dk site OplevTeateret ... the thickness and number of the layers, the frequency wavelength of the passband of the filter ... nearly as hot as the equivalent conventional filter which attempts to absorb all energy except ... prism is used instead. For cameras, however it is now more common to have a Bayer filter to filter ... than conventional filters Ability to easily fabricate a filter to pass any passband frequency ... rather than absorbed, there is much less heating of the dichroic filter than with conventional ... of the hard microscopic layers and cannot bleach out over the lifetime of the filter unlike for example, gel filters Filter will not melt or deform except at very high temperatures many hundreds of degrees ... fabricated to behave as a dichroic filter. Because the wavelength of light selected by the filter ... filters is spatial filter ing. ref http ol.osa.org abstract.cfm?id 83357 Optics Letters Bot generated ... 2005 See also Color gel Dielectric mirror Fabry P rot interferometer or Etalon for a mathematical description Filter optics Holographic Versatile Disc Thin film optics References Reflist Category Optical ... more details
Clenshaw Curtis quadrature and Fej r quadrature are methods for numerical integration , or quadrature ... accuracy comparable to Gaussian quadrature rules, Clenshaw Curtis quadrature naturally leads to nested quadrature rule s where different accuracy orders share points , which is important for both adaptive quadrature and multidimensional quadrature cubature . Briefly, the function mathematics function ..., Implementing Clenshaw Curtis quadrature I Methodology and experience, Communications of the ACM ... Papers fejer.html Fast construction of the Fej r and Clenshaw Curtis quadrature rules , BIT Numerical Mathematics 46 1 , p. 195 202 2006 . ref Clenshaw Curtis quadrature A simple way of understanding the algorithm is to realize that Clenshaw Curtis quadrature proposed by those authors in 1960 ... trapezoidal.pdf Notes on the convergence of trapezoidal rule quadrature , online MIT course notes ... this formula, it is clear that the Clenshaw Curtis quadrature rule is symmetric, in that it weights .... Fej r quadrature Lip t Fej r Fej r proposed two quadrature rules very similar to Clenshaw Curtis quadrature, but much earlier in 1933 . ref name Fejer33 Leopold Fej r, http projecteuclid.org ..., Fej r s second quadrature rule is nearly identical to Clenshaw Curtis. The only difference ... extrema of the Chebyshev polynomials, i.e. the true stationary points. Fej r s first quadrature ... spaced midpoints are the only other choice of quadrature points that preserve both the even and odd ... 0.5 k pi N math which is precisely the type II DCT. However, Fej r s first quadrature rule is not nested ... Clenshaw Curtis quadrature or Fej r s second rule. Despite the fact that Fej r discovered these techniques before Clenshaw and Curtis, the name Clenshaw Curtis quadrature has become standard. Comparison to Gaussian quadrature The classic method of Gaussian quadrature evaluates the integrand at math ... math 2N 1 math . In contrast, Clenshaw Curtis quadrature, above, evaluates the integrand at math ... more details
In numerical analysis Gauss Laguerre quadrature is an extension of Gaussian quadrature method for approximating the value of integrals of the following kind math int 0 infty e x f x ,dx. math In this case math int 0 infty e x f x ,dx approx sum i 1 n w i f x i math where x sub i sub is the i th root of Laguerre polynomial L sub n sub x and the weight w sub i sub is given by ref name AS Abramowitz, M & Stegun, I A, Handbook of Mathematical Functions , 10th printing with corrections 1972 , Dover, ISBN 978 0 486 61272 0. Equation 25.4.45. http www.nrbook.com abramowitz and stegun page 890.htm access online ref math w i frac x i n 1 2 L n 1 x i 2 . math For more general functions To integrate the function math f math math int 0 infty f left x right dx int 0 infty f left x right e x e x dx int 0 infty g left x right e x dx math . Generalized Gauss Laguerre quadrature More generally, one can also consider integrands that have a known math x alpha math power law singularity at x 0, for some real number math alpha 1 math , leading to integrals of the form math int 0 infty x alpha e x f x ,dx. math This allows one to efficiently evaluate such integrals for polynomial or smooth f x even when is not an integer. ref Philip Rabinowitz and George Weiss, Tables of Abscissas and Weights for Numerical Evaluation of Integrals of the form math int 0 infty exp x x n f x dx math , Mathematical Tables and Other Aids to Computation , vol. 13, pp. 285 294 1959 . ref Program to Calculate Modified Gauss Laguerre Abscissa And Weights In Mathematica 7 Suppose want to calculate for n 5 n 5 t Array N Root LaguerreL n, x , &, n w t n 1 LaguerreL n 1 , t 2 modW Array Exp t t n 1 LaguerreL n 1 , t 2 &, n ... 8067 gauss laguerre Matlab routine for Gauss Laguerre quadrature http people.sc.fsu.edu jburkardt m src gen laguerre rule gen laguerre rule.html generalized Gauss Laguerre quadrature , free software in Matlab, C , and Fortran. Category Numerical integration quadrature ru ... more details
Unreferenced stub auto yes date December 2009 Orphan date February 2009 A wedge filter is an Filter optics optical filter so constructed that its thickness varies continuously or in steps in the shape of a wedge. The filter is used to modify the Intensity physics intensity distribution in a radiation beam. DEFAULTSORT Wedge Filter Category Optical filters Optics stub ... more details
hot mirrorfilter, a Polarizer polarising filter , and a UV filter . The larger filter is a polariser for Photographic filter Square filters Cokin style filter mounts . In photography and videography , a filter is a camera accessory consisting of an filter optics optical filter that can be inserted in the optical path. The filter can be a square or oblong shape mounted in a holder accessory, or, more ... longer Exposure photography exposure . As the filter is in the optical path, any imperfections ... CC for colour correction, 50 for the strength of the filter, Y for yellow. Filter optics Optical filters .... The article on Filter optics optical filters has material relevant to photographic filters. Uses ... subtraction color subtraction Contrast enhancement Contrast enhancement Infrared filter Infrared Neutral density filter Neutral density , including the graduated neutral density filter and solar filter Polarizer Polarizing Special effects of various kinds, including Graduated filter Graduated color ... reduction Spot Close up filter Close up or macro diopters, and split diopters or split focus Clear ..., and ideally perform no filtering of incoming light. The only use of a clear filter is to protect ... photographic film and sensors are sensitive, but not the human eye. A UV filter passes all or most ... for the radiation they pass green and infrared filters pass their named colors, but a UV filter blocks ... protection in the same way as clear filters. A strong UV filter, such as a Haze 2A or UV17, cuts off ... film. Image Nikon D700 defekter B W Filter UV 010 und Obejektiv 28 85mm KW 2009 03 010.jpg thumb right 250px Nikon D700 with broken filter B W UV 010 and lens Nikkor 28 85mm While in certain cases, such as harsh environments, a protection filter may be necessary, there are also downsides to this practice. Arguments for the use of protection filters include If the lens is dropped, the filter may well suffer scratches or breakage instead of the front lens element. The filter can be cleaned frequently ... more details
File Plachetka kal.jpg thumb right 250px A filter cake A filter cake is formed by the substances that are retained on a filter chemistry filter . The filter cake grows in the course of filtration , becomes thicker as particulate matter is being retained. With increasing layer thickness the flow resistance of the filter cake increases. After a certain time of use the filter cake has to be removed from the filter, e.g. by backflushing. If this is not accomplished, the filtration is disrupted because the flow resistance of the filter cake gets too high, thus too little of the mixture to be filtered can pass the filter cake and the filter plugs. The specifications of the filter cake dictate the filtration method of choice ref http www.bhs filtration.com technical Selection of Filtration.pdf ref References reflist DEFAULTSORT Filter Cake Category Filters Category Water treatment Category Water technology Hydrology stub de Filterkuchen uk ... more details
File X cubed plot.svg thumb Cavalieri s quadrature formula computes the area under the cubic curve , together with other higher powers. In calculus , Cavalieri s quadrature formula , named for 16th century Italian mathematician Bonaventura Cavalieri , is the integral math int 0 a x n ,dx tfrac 1 n 1 ... to compute the integrals of all polynomials. The term quadrature is a traditional term for area the integral ... important cases are y x sup 2 sup , the quadrature of the parabola , known in antiquity, and y 1 x , the quadrature of the hyperbola, whose value is a logarithm . Forms ... s quadrature formula. For positive integers, this proof can be geometrized ref Harv Barth 2004 ... the equivalence between the quadrature of the parabola and the volume of a pyramid, which were computed ... the area of parabolic segments in his The Quadrature of the Parabola . A detailed discussion ... Archimedes in his The Quadrature of the Parabola 3rd century BCE , via the method of exhaustion . Of note ... chapter for brief form ref This method of quadrature was then extended by Italian mathematician ... the exceptional case n &minus 1 quadrature of the hyperbola before finally being ... case of &minus 1 by an algebraic trick he computed the quadrature of the higher hyperbolae via dividing the line into equal intervals, and then computed the quadrature of the higher parabolae by using ... quadrature circuli et sectionum coni 1647 , though a formal treatment had to wait for the development .... J. title A new proof of Cavalieri s quadrature formula journal The American Mathematical Monthly volume .... title Remark on Cavalieri s quadrature formula arxiv math 0505059 journal The American Mathematical ... R S 1 cite journal last1 Barth first1 N. R. title Computing Cavalieri s quadrature formula ... year 2006 A geometric proof of Cavalieri s quadrature formula, http www.lix.polytechnique.fr Labo ... into 2n pyramids refend External links mathworld title Cavalieri s Quadrature Formula id CavalierisQuadratureFormula ... more details
Unreferenced date December 2006 orphan date November 2009 A warm filter is a photographic filter that improves the color of all skin tones and absorbs blue cast often caused by electronic flash or outdoor shade. Adds warmth to pale, washed out flesh tones and are ideal for portrait s as they smooth facial details while adding warmth to skin tones for color imaging In general, they suppress blue casts on overcast days and on subjects lit by blue sky. See also Filter photography UV Filter Polarizer Infrared filter Neutral density filterFilter factor DEFAULTSORT Warm Filter Category Optical filters ... more details
Unreferenced date June 2009 A disk filter is a type of filter water water filter used primarily in irrigation, similar to a screen filter , except that the filter cartridge is made of a number of disks stacked on top of each other like a pile of poker chips. The water passes through the small grooves in between and the impurities are trapped behind. Some types of disk filters can be backflushed in such a way that the disks are able to separate and spin during the cleaning cycle. Category Filters Category Irrigation tech stub ... more details
Orphan date February 2009 The Fermi filter is a common image processing filter that uses the Fermi Dirac statistics Fermi Dirac distribution in the Frequency domain to perform a low pass filter or high pass filter similar to a Gaussian blur , but the harshness can be scaled. References http www.wadsworth.org spider doc spider docs man fqnp.html Spider doc for using Fermi filter in cryoEM Category Image processing ... more details
File Kalolis.jpg thumb right 250px Filter press Filter press sometimes called Plate and Frame Filter ... ref http www.bhs filtration.com documents A Review of Filter Press Basics Versus Alternative Replace 20Final.pdf ref . The majority of today s filters are more correctly called chamber filter press , Membrane filter press , or Membrane Plate Filter . Many processes in the food, chemical or pharmaceutical ..., but are carried along in it. Filter presses separate the solids from the liquids so that the useful part can be processed, packaged or delivered to the next step. Filter presses generally work in a batch manner. The plates are clamped together, then a pump starts feeding the slurry into the filter press to complete a filtering cycle and produce a batch of solid filtered material, called the filter ... and the filtering cycle is repeated. A filter press uses increased pump pressure to maximize the rate of filtration and produce a final filter cake with a water content under 65 . This is more efficient ... reach anywhere between 50 200 PSI. A filter press consists of a series of filter chambers formed between square, rectangular or round filter plates supported on a metal frame. Once the filter chambers are clamped, the filter press is loaded with slurry. The plates on the filter press are clamped ... inch. In addition to the filter plate filtration medium, the growing filter cake enhances removal of fine particles in the slurry. The solution coming through the filter press water bibs, called ... in a water tank for recycled use. At the end of filtration, the solid filter cake can be removed. The whole .... See also Belt filter References Reflist External links http www.sat eng.com satfilterpress.pdf Manufacturer of Filter presses http www.dinworks.fi suotonauhapuristimet en.html Some of the pictures of Filter presses http www.leofilterpress.com filter press ?302.html various filter presses model demo http www.yilmaztekstilltd.com Filter Press http www.aesaritma.com.tr Biggest Filterpresses in the world ... more details
Merge to Filtration Filter media discuss Talk Filter chemistry Filter media section is duplicate in Filtration page date March 2011 Unreferenced date December 2009 Expert subject Chemistry date November ... top left glass fibre , in line polypropylene , Laboratory glassware Fritted glass glass frit , filter paper paper and PTFE syringe filters. In chemistry and common usage, a filter is a device usually ... shaped device . Filter efficiency can be improved in a number of ways, such as with the use of fluted filter paper. Other types of materials may be used to effect separations based on size, similar to filters, such as molecular sieves . The process of passing a mixture through a filter is called filtration ... , while the solid remaining in the filter is called retentate , residue , or filtrand . For references, just Google filtrand Filter media There are two types of filter media &mdash a surface filter , a solid sieve which traps the solid particles, with or without the aid of filter paper e.g. B chner funnel , Belt press , Rotary vacuum drum filter , crossflow filtration Crossflow filters , and a depth filter , a bed of granular material which retains the solid particles as it passes e.g. sand filter ... cheaper and easier to discard the contaminated granules than to clean the solid sieve. Filter media ... , the renal glomerulus filtrate Filters for various substances Water filter Air filter Oil filter Filters for specific applications Pneumatic filter Coffee filterFilter mask Filters by various methods Disk filterFilter paper Paper filter Media filter Membrane technology Membrane filter Cross flow filtration Sand separator Screen filter Sand filter Related devices and concepts Activated carbon Artificial membrane Non Filter trade name . Gas mask Sieve Colander Reverse osmosis Filter feeder Filter binding assay DEFAULTSORT Filter Chemistry Category Filters ar da Filter procesteknik de Filter Fluidtechnik es Filtro hidr ulica fr Filtre physique sq Filtrimi simple Filter fi Suodatus ... more details
Wikify date April 2010 An impingement filter can be used to purify a polluted solution, be it gas or liquid. The impingement filter acts by inducing the solution to change direction and the particles to adhere to the filter medium. In many cases this filter medium is designed to contain apertures of specific size which will absorb the impurities in the solution. The gas or liquid, less impurities, is permitted free passage through the medium. Common examples of impingement filters are air filter s, fuel filter s and oil filter s used in cars, trucks etc. References http pubs.acs.org doi abs 10.1021 i560093a015 Measuring Smokes and Rating Efficiencies of Industrial Air Filters http www.fao.org docrep t0512e t0512e0d.htm Gas cleaning and cooling Category Filters ... more details
Refimprove date December 2009 File Hot Mirror 6188.jpg thumb 200px right A Tiffen photographic hot mirrorfilter. A hot mirror is a specialized dielectric mirror , a dichroic filter , often employed to protect optical systems by reflecting infrared light back into a light source, while allowing visible light to pass. Hot mirrors can be designed to be inserted into the optical system at an incidence angle varying between zero and 45 degrees, and are useful in a variety of applications where heat build up can damage components or adversely affect spectral characteristics of the illumination source. Wavelength s reflected by an infrared hot mirror range from about 750 to 1250 nanometer s. By transmitting visible light wavelengths while reflecting infrared, hot mirrors can also serve as dichromatic beam splitter s for specialized applications in microscopy Fluorescence Microscopy fluorescence microscopy . Some early digital cameras designed for visible light capture, such as the Kodak DCS 400 series Associated Press NC2000 and Nikon Coolpix 950 , were unusually sensitive to infrared radiation, and tended to produce colours that were contaminated with infrared. This was particularly problematic with scenes that contained strong sources of infrared, such as fires, although the effect could be moderated by inserting a photographic hot mirrorfilter into the imaging pathway. ref http www.robgalbraith.com bins multi page.asp?cid 7 6463 7191 7457 A look back at the NC2000 , Eamon Hickey, January 2005 ref Conversely, these cameras could be used for infrared photography by inserting a cold mirrorfilter into the imaging pathway, most commonly by mounting the filter on the front of the lens .... ref name patent cite web url http www.docstoc.com docs 45014380 Heat Mirror For Incandescent Lamp Patent 4346324 title Heat Mirror For Incandescent Lamp Patent 4346324 ref ref name spie cite web ... DEFAULTSORT Hot Mirror Category Optics Category Mirrors optics stub ar ... more details
Charcoal filter can refer to activated charcoal , used as a filter Charcoal Filter , a Japanese rock band disambig Short pages monitor This long comment was added to the page to prevent it being listed on Special Shortpages. It and the accompanying monitoring template were generated via Template Longcomment. Please do not remove the monitor template without removing the comment as well. ... more details
Multiple issues orphan July 2010 notability July 2010 no footnotes July 2010 wikify March 2012 Quadrature Division Multiple Access QDMA is a radio protocol. ref cite book last Held first Gilbert title Wireless mesh networks year 2005 publisher CRC Press isbn 9780849329609 pages 44 url http books.google.com books?id FdHevsDK3mEC&pg PA44 ref The term combines two standard terms in telecommunications, CDMA and QPSK . Applications QDMA is used for local area networks, usually wireless short range such as WiMax. CDMA and QDMA are especially suitable for modern communications, for example the transmission of short messages such as SMS or MMS communication when in motion from cars, trains, etc. the establishment of unplanned links. Benefits over TDMA and FDMA Unreferenced section date July 2010 The traditional TDMA and FDMA require a lot of overhead to set explain a link parameters grammatical problem with a new user, or to detect that a user left and their allocation is free to be allocated to another. In CDMA or QDMA, a new user is simply allocated a new code and is ready to go. It may impose a slight load on the spectrum, but the system is so devised as to absorb a controlled measure of collisions and continue operations at a high level of quality of service. References Reflist John G. Proakis, Digital Communications, Third Edition, ISBN 0 07 051726 6 Ulrich L. Rohde, Jerry Whitaker, T.T.N.Bucher, Communications Receivers, Second Edition, ISBN 0 07 053608 2 Category Channel access methods ... more details
In signal processing , a washout filter is a filter that makes a transition caused by changes in the input source more smooth. An example of this transition is the change in the modes of a signal . The general form of this filter is H s s s a It has been used in flight control stabilization. An example of this use of can be located at http www.mathworks.com products control demos.html?file products demos shipping control jetdemo.html Yaw Damper Design for a 747 Jet Category Signal processing Category Filter theory ... more details
Unreferenced date December 2009 Orphan date December 2009 A roofing filter is a type of filter used in a High frequency HF Receiver radio receiver . It is usually found after the first receiver mixer. The goal of a roofing filter is to reduce the passband of the 1st intermediate frequency IF to about 6 20 Hertz kHz , so that overloading and distortions by the following amplifier stages and mixers are reduced. The receiver s Bandwidth signal processing is not determined by the roofing filter but by a following crystal filter , mechanical filter or digital signal processing DSP filter. These allow much better filtering curve than a roofing filter, which often uses a high 1st IF of higher than 40 Megahertz MHz . Because of this, roofing filters are usually crystal filter types. While a 6 20 kHz roofing filter is acceptable for general purpose HF radio reception, demanding uses like listening to weak Continuous wave CW or sideband SSB signals requires the use of roofing filters that are a much smaller width appropriate to the reception mode in use. 250 Hz, 500 Hz, or 1.8 kHz would be acceptable values. These also require that the receiver uses a low first IF below Very low frequency VHF range, perhaps 9 or 11 MHz. DEFAULTSORT Roofing Filter Category Wireless tuning and filtering uk ... more details
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