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Topic: QFT


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QFT began a programme in May 2005 to create a series of demonstrator devices to exemplify the benefits of this new electron source (known as “Hot Tips”™).
QFT is seeking development partners to evaluate the incorporation of Hot Tips™ technology into their display products.
QFT invites interest from display companies who wish to evaluate this exciting new technology which offers the key to high-performance and economic field emission displays.
www.qft-ltd.co.uk /index.html   (260 words)

  
  Quantum field theory - Wikipedia, the free encyclopedia
However, in the case of QFT, the operators are generated by what is known as operator-valued fields, that is, operators which are parametrized by a spacetime point.
QFT, on the other hand, deals with fields on a fundamental level and particles only emerge as localized excitations (aka quanta aka quasiparticles) of the ground state (aka the vacuum) and it's precisely these quantum fields which correspond to the operator valued functions.
This simple explanation of what QFT really is, is often obscured in treatments which jump straight to the path integral approach, which is a good computational technique but often obscures the underlying ideas.
en.wikipedia.org /wiki/Quantum_field_theory   (3759 words)

  
 QFT - Wikipedia, the free encyclopedia
QFT is a three-letter abbreviation with multiple meanings, as described below:
An alternative meaning is that the 'quoter' quotes the first 'poster' in order to show that the 'quoter' agrees with the 'poster'.
This page concerning a three-letter acronym or abbreviation is a disambiguation page—a list of articles associated with the same title.
en.wikipedia.org /wiki/QFT   (187 words)

  
 QFT Newsletter March / April 2005   (Site not responding. Last check: 2007-10-10)
QFT is proud to announce that our FAST=TRACK course Food Hygiene Principles and Practice is being launched by Improve on 24th February 2005 as the centrepiece of a web-based training strategy.
QFT and COWA are proud of our successful 3-year relationship, and look forward to continuing this success in the future.
As QFT is growing rapidly, she is a superb asset to our team, and will help quality manage and co-ordinate much of our work for the future.
www.qft.co.uk /news/news15.htm   (767 words)

  
 Northern Ireland Film and Television Commission - QFT
QFT (Queen's Film Theatre) is one of the longest operating cultural cinemas in the British Isles.
QFT also organises INSET training for teachers in the use of the moving image in the classroom.
QFT is one of the screening venues for the Belfast Film Festival and the Belfast Festival at Queens www.belfastfestival.com
www.niftc.co.uk /page.asp?id=104   (266 words)

  
 Urban Dictionary: qft
qft qfe forum qfmft quoted truth emphasis fuck internet qftmft quoted for emphasis quoted for truth sft forums qtf 1337 cheese forum talk fucking gtfo internet lingo motherfucking noob qfs quiffy quit fucking talking quote salmon salmoned for truth tfq the troll war games wtf
QFT, you dumb fuck so you can't say later that you didn't say that.
The branch of quantum physics that is concerned with the theory of fields; it was motivated by the question of how an atom radiates light as its electrons jump from excited states.
www.urbandictionary.com /define.php?term=qft   (419 words)

  
 Guidelines for Using the QuantiFERON
Limitations of QFT include the need to draw blood and process it within 12 hours after collection and limited laboratory and clinical experience with the assay.
Interpretation of QFT results (Table 2) is stratified by estimated risk for infection with M.
Negative QFT results do not require confirmation, but results can be confirmed with either a repeat QFT or TST if the accuracy of the initial test is in question.
www.cdc.gov /mmwr/preview/mmwrhtml/rr5202a2.htm   (2151 words)

  
 QFT Flight Control System Design Using Mathematica -- from Mathematica Information Center
Quantitative Feedback Theory (QFT) is a control systems design methodology which can be applied to the design of both scalar and multivariable control systems.
The QFT design technique is particularly applicable to flight control systems (FCS) design since modern combat aircraft have a high degree of inherent airframe instability and a large variation in plant parameters over a range of flight conditions.
QFT controllers also have decoupling properties for multivariable systems as is demonstrated in a design for an Advanced Short Take-Off and Vertical Landing Aircraft at a single operating condition.
library.wolfram.com /infocenter/Articles/3193   (144 words)

  
 The QFT project
QFT package makes use of the (Einstein) sum rule for repeated indices.
Introduction to the QFT package page.The package is today not ready with respect to its original goals, but already useful for varied computations not possible using standard Maple.
1995: A proposal for a more general QFT package is presented in the Brazilian Meeting for Fields and Particle Physics ENFP/95 by E.S. Cheb-Terrab, L. da Mota and E.C. Vazques (DFT-UERJ, Brasil).
www.scg.uwaterloo.ca /~ecterrab/qft.html   (192 words)

  
 Urban Dictionary: qft
QFT is used in online forums, and stands for Quoted For Truth.
As an alternate to "Quoted For Truth" QFT can be used in the same manner and context to mean "Quite Fucking True".
'QFT' is usually used by children (i.e, under 13) who have clearly not had internet access long enough.
www.urbandictionary.com /define.php?term=qft&page=2   (410 words)

  
 [No title]   (Site not responding. Last check: 2007-10-10)
QFT is not recommended for use in many of the persons who need to be screened for TB:
More information on the reproducibility of the QFT is needed to evaluate the accuracy of QFT in serial testing.
The study done at Johns Hopkins University School of Medicine found the reproducibility of QFT was low.
www.oregon.gov /DHS/ph/tb/docs/qft.shtml   (319 words)

  
 QFT.html
The QFT package uses - by default - the (Einstein) sum rule for repeated indices, so that its routines take that rule into account whenever such a product of tensor objects is found in the input, or just take advantage of the rule to express the result of a computation performed.
From the computational point of view, QFT is today a general purpose environment to perform symbolic computations in theoretical physics.
The QFT library (files maple.ind and maple.lib found in the zip) is installed by puting it in the first directory shown in the libname (in this demo it is found at c:\\projects\\lib)
www.cs.uwaterloo.ca /~ecterrab/qft/talk_QFT.html   (1271 words)

  
 MathWorks: QFT Toolbox   (Site not responding. Last check: 2007-10-10)
QFT is an engineering method that uses frequency-domain concepts to satisfy performance specifications and handle plant uncertainty.
The QFT Control Design Toolbox facilitates computing QFT bounds, nominal loop-shaping and pre-filter shaping, and performance validation in continuous and direct z-domain systems.
QFT allows the design of a controller to meet specifications despite variations in the parameters of the model.
www.ccr.jussieu.fr /ccr/Documentation/Calcul/matlab5v11/docs/00008/008c0.htm   (338 words)

  
 QFT - Quantitative Feedback Theory
QFT stands for Quantitative Feedback Theory, which emphasises the use of feedback in order to achieve adequate robust system performance tolerances despite the presence of plant and disturbances uncertainties.
Quantitative Feedback Theory (QFT) developed by Horowitz (Horowitz, 1963; Horowitz and Sidi, 1972), is a frequency domain technique utilising the Nichols Chart (NC) in order to achieve a desired robust design over a specified region of plant uncertainty.
Desired time-domain responses are translated into frequency domain tolerances, which lead to bounds (or constraints) on the loop transmission function.
cnx.rice.edu /content/m11109/latest   (292 words)

  
 Microanthropic Principle: Quantum Field Theory
To begin with, since QFT is relativistic, all events described by it take place in four-dimensional space-time.
On the other hand, since QFT is an extension of Quantum Mechanics, it has the same probabilistic interpretation.
Amplitude of a transition from an initial state to some final state is calculated in QFT by summing up the amplitudes of all possible paths between the two states.
www.relisoft.com /Science/Physics/MicroAnt4.html   (607 words)

  
 QFT with curved spacetime
QFT has been constructed only on rigid (flat or curved) spaces whose geometry is not dynamic but is fixed ahead of time.
Marcus, the idea of QFT in curved spacetime is not about rigid spacetime but about mating QFT to GR with its dynaminc spacetime.
There are many problems with this, such as the instability of spinors under general diffeomorphisms and the apparent unrenormalizabilty of this meld in its perturbative form, which given that neither QFT nor GR are really known non-perturbatively, would seem to be a killer.
www.physicsforums.com /showthread.php?t=69371   (982 words)

  
 Re: Interpretation of qft
QFT is a quantum mechanical theory (or, > class of theories).
Relativistic QFT superseded non-relativistic > quantum mechanics (...) Well, as Schwinger* writes: "relativistic quantum mechanics is...
Then again, Dyson, in his old Sci Am article on "Field Theory", characterizes QFT roughly as relativity + QM, and so I will continue to write QFT with the understanding that the "relativistic" part is understood as implicit.
www.lns.cornell.edu /spr/2002-02/msg0039521.html   (137 words)

  
 QFT Encyclopedia Article, Description, History and Biography @ ArtisticNudity.com   (Site not responding. Last check: 2007-10-10)
Looking For qft - Find qft and more at Lycos Search.
Find qft - Your relevant result is a click away!
Look for qft - Find qft at one of the best sites the Internet has to offer!
www.artisticnudity.com /encyclopedia/QFT   (271 words)

  
 QFT Newsletter Summer 2005   (Site not responding. Last check: 2007-10-10)
Joshua Rhys William Nixon was born on 22nd March weighing in at a whopping 10lb 14oz.
As Christmas is their busiest time of year, many food companies favour early spring to commence training schemes such as NVQ training.
QFT's services and training materials have recently been purchased by Huddersfield Technical College, Gateshead College, Boston College, Somerset College of Arts and Technology, Preston College, Hull College and The College of West Anglia.
www.qft.co.uk /news/news16.htm   (422 words)

  
 Amazon.com: Quantum Field Theory in a Nutshell: Books: A. Zee   (Site not responding. Last check: 2007-10-10)
One problem with learning QFT is that it is so easy to get lost in the mathematical details that the core physics concepts often get obscured.
I too have a pile of QFT books, and when I purchased Zee's book I was excited that at last someone had written a great intro level book.
It is a very well written scientific biography of QFT starting from the 1890s with the discovery of x-rays and electrons, through modern particle physics.
www.amazon.com /exec/obidos/tg/detail/-/0691010196?v=glance   (2259 words)

  
 allnurses.com   (Site not responding. Last check: 2007-10-10)
Peskin's QFT book is NOT the one you should buy if you want to UNDERSTAND renormalization.
Due to tactical considerations and space limitations however, the experimental developments of QFT, proof of some of the more advanced results, and an account of the history of the subject have been mostly left out to the other references.
For delving deeper into some of the more formal aspects of QFT also, I have personally found Lewis Ryder's book to be a valuable companion to Peskin & Schroeder.
www.allnurses.com /nursingbooks/shop.php?c=NsgBooks&n=14601&i=0201503972&a=reviews&p=1   (1299 words)

  
 The QFT project
QFT package makes use of the (Einstein) sum rule for repeated indices.
Introduction to the QFT package page.The package is today not ready with respect to its original goals, but already useful for varied computations not possible using standard Maple.
1995: A proposal for a more general QFT package is presented in the Brazilian Meeting for Fields and Particle Physics ENFP/95 by E.S. Cheb-Terrab, L. da Mota and E.C. Vazques (DFT-UERJ, Brasil).
www.cs.uwaterloo.ca /~ecterrab/qft.html   (192 words)

  
 Automatic Loop-Shaping of QFT Controllers via Linear Programing
It is generally agreed that such a design process is efficient for "simple" problems such as those that do not require complex, high-order controllers.
Novice QFT designers, however, often face difficulties even with "simple" problems for lack of loop-shaping experience.
In this paper we focus on the following automatic loop-shaping problem: given a nominal plant, a finite set of QFT bounds and a fixed controller order, synthesize a controller that achieves internally stability, satisfies its bounds and has a minimum high-frequency gain.
www.ecs.umass.edu /mie/labs/dacs/qft.htm   (299 words)

  
 New methodology to design complete mould QFT multivariable controllers
For example, when the ABS reduces the braking of a car to avoid the blocking of wheels, or in case of an electronic circuit that tunes the exact frequency of a digital radio.
The doctoral thesis is set within the Quantitative Feedback Theory (QFT), whose development started at the end of the 50s under the supervision of professor Horowitz.
Since then, some of the technical applications based on QFT are air traffic controllers of the most modern airplanes, monitoring systems of high precision satellites, sewage treatment plants or robotic.
www.innovations-report.com /html/reports/process_engineering/report-13962.html   (496 words)

  
 "B11C-1042" in fm06
The standard method of characterizing the spectral optical properties of particles in aquatic ecosystems is the Quantitative Filterpad Technique (QFT) in which a water sample is concentrated on a fine glass fiber filter (GFF) and its optical density is then measured in the beam of a scanning spectrophotometer.
An improved QFT method (QFT-TR) established in the past decade involves laboratory measurement of both transmittance and reflectance for each sample using an integrating sphere attachment in a scanning spectrophotometer.
Transmittance, reflectances, and absorbance spectra for particles from streams (rich in mineral particles) and lakes (some with humic particles, others with predominantly phytoplankton) are compared using the old and new methods.
www.agu.org /cgi-bin/wais?hh=B11C-1042   (367 words)

  
 QFT - Quantitative Feedback Theory
QFT stands for Quantitative Feedback Theory, which emphasises the use of feedback in order to achieve adequate robust system performance tolerances despite the presence of plant and disturbances uncertainties.
Quantitative Feedback Theory (QFT) developed by Horowitz (Horowitz, 1963; Horowitz and Sidi, 1972), is a frequency domain technique utilising the Nichols Chart (NC) in order to achieve a desired robust design over a specified region of plant uncertainty.
Desired time-domain responses are translated into frequency domain tolerances, which lead to bounds (or constraints) on the loop transmission function.
cnx.org /content/m11109/latest   (316 words)

  
 Quick Fourier Transform   (Site not responding. Last check: 2007-10-10)
We developed an approach that uses symmetric properties of the basis function to remove redundancies in the calculation of discrete Fourier transform (DFT).
We will develop an algorithm, called the quick Fourier transform (QFT), that will reduce the number of floating point operations necessary to compute the DFT by a factor of two or four over direct methods or Goertzel's method for prime lengths.
The source codes for the QFT can be downloaded from here.
www-ece.rice.edu /~harry/qft.html   (169 words)

  
 QFT Schwinger-Dyson - Wikibooks, collection of open-content textbooks
In quantum field theory, if the action is given by the functional S of field configurations (which only depends locally on the fields), then the time ordered vacuum expectation value of polynomially bounded functional F, , is given by
If J (called the source field) is an element of the dual space of the field configurations (which has at least an affine structure because of the assumption of the translational invariance for the functional measure), then, the generating functional Z of the source fields is defined to be:
is viewed as a functional distribution (this shouldn't be taken too literally as an interpretation of QFT, unlike it's Wick rotated statistical mechanics analogue, because we have time ordering complications here!), then
en.wikibooks.org /wiki/QFT_Schwinger-Dyson   (765 words)

  
 aNIme » Blog Archive » ‘Akira Recut’ at QFT
I’m not entirely sure what this means, but the QFT will be screening what they’re calling Future Shorts/Akira Recut on November 17th.
I’ll call the QFT later this afternoon, and update this post if I can get a clarification of what this screening’s actually going to consist of.
This entry was posted on Thursday, November 9th, 2006 at 4:35 pm by aniki and is filed under Events, Screenings.
www.anime-ni.co.uk /?p=541   (136 words)

  
 Algebraic Quantum Field Theory   (Site not responding. Last check: 2007-10-10)
Quantum Field Theory (QFT) is the general framework for the description of the physics of relativistic quantum systems, notably of elementary particles.
It is the synthesis of Quantum Theory and Special Relativity, supplemented by the principle of Locality in space and time, and by the Spectral Condition in energy and momentum.
Algebraic QFT (AQFT) emphasizes the role of algebraic relations among observables which determine, rather than quantum fields proper, a physical system.
unith.desy.de /research/aqft   (98 words)

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