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Topic: A Proportional Response

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Feedback and Temperature Control proportional controller is used at high gain can be mitigated by adding a term proportional to the time-derivative of the error signal, Although PD control deals neatly with the overshoot and ringing problems associated with proportional control it does not cure the problem with the steady-state error. The value of the damping constant, D, can be adjusted to achieve a critically damped response to changes in the set-point temperature, as shown in the next figure. newton.ex.ac.uk /teaching/CDHW/Feedback/ControlTypes.html

CTM: PID Tutorial This tutorial will show you the characteristics of the each of proportional (P), the integral (I), and the derivative (D) controls, and how to use them to obtain a desired response. The signal (u) just past the controller is now equal to the proportional gain (Kp) times the magnitude of the error plus the integral gain (Ki) times the integral of the error plus the derivative gain (Kd) times the derivative of the error. A proportional controller (Kp) will have the effect of reducing the rise time and will reduce,but never eliminate, the steady-state error. rclsgi.eng.ohio-state.edu /matlab/PID/PID.html

Decay_Counting In the proportional counter region where the applied potential is between 800V and 1000V (see Figure 2), gas amplification can be up to 104, but the dead time is only about 1 microseconds as compared to 50 to 200 microseconds for a Geiger counter. It was not until the invention of vacuum tubes in the 1920's along with advances in electronic circuitry that proportional counters became a portable method of quantitative detection. In the Geiger counter region of 1100V to 1600V (see Figure 2), the gas amplification is greater than 109, but the response time is limited by the cations produced by the interaction of beta radiation. www.arches.uga.edu /~jbishop/Decay_Counting.html

Introducing doseresponse curves For example, the response might be enzyme activity, accumulation of an intracellular second messenger, membrane potential, secretion of a hormone, heart rate or contraction of a muscle. If you assume that the production of second messenger is proportional to receptor occupancy, the graph of agonist concentration vs. second messenger concentration will have the same shape as receptor occupancy (a hyperbola if plotted on a linear scale, a sigmoid curve with a slope factor of 1.0 if plotted as a semilog graph). A partial agonist is a drug that provokes a response, but the maximum response is less than the maximum response to a full agonist. www.curvefit.com /introduction89.htm

Frequency Response Characteristics The graph below shows a typical frequency response curve for a proportional (or electrohydraulic servo) valve. For this particular valve, at an amplitude of -3db (50% output), the frequency response is 10 Hz. Curves (a) and (b) show the relationship between ampliyude response and frequency. inprosys.bizland.com /website/freq.htm   (383 words)

1/f noise 1/f noise is a signal or process with a frequency spectrum such that the spectral energy density is proportional to the reciprocal of the frequency. Graphic equalizers also divide signals into bands logarithmically and report power by octaves; audio engineers put pink noise through a system to test whether it has a flat frequency response in the useful spectrum. The human auditory system, which uses a roughly logarithmic concept of frequency approximated by the Bark scale, does not perceive equal magnitude at all frequencies, thus white noise is not perceived as white noise, while pink noise is. encycl.opentopia.com /term/1/f_noise   (203 words)

RLC circuit - Wikipedia, the free encyclopedia Since electrical power is proportional to the square of the circuit voltage (or current), the frequency response will drop to The bandwidth is a measure of the width of the frequency response at the two half-power frequencies. Notice that this expression for Y(s) is the same as the one we found for the Zero State Response. en.wikipedia.org /wiki/RLC_circuits   (1487 words)

The Air Shower Core Experiment L. Horton, J. Ulrichs, M.M. Winn, The Response of Multi-Wire Proportional Counters (MWPCs) to Air Shower Particles, Proceedings of the 22nd International Cosmic Ray Conference, Dublin, 4 (1991), 488. L. Horton, J. Ulrichs, M.M. Winn, B. Yabsley, The Core Structure of Extensive Air Showers as Recorded with an Array of Multi-Wire Proportional Counters (MWPCs), Proceedings of the 22nd International Cosmic Ray Conference, Dublin, 4 (1991), 261. Triggered by an array of 8 scintillators, it measured the particle densities of the air-shower cores using an array of Multi-Wire Proportional Chambers (MWPC) of area 4.0 m x 3.4 m working in the proportional mode. www.physics.usyd.edu.au /hienergy/asce.html   (1487 words)

Dose-response relation of inhaled fluticasone propionate in adolescents and adults with asthma: meta-analysis Commentary: Dosage needs systematic and critical -- Holt et al. 323 (7307): 253 -- BMJ Efficacy response of inhaled beclometasone dipropionate in asthma is proportional to dose and is improved by formulation with a new propellant. On combining dose response data from epidemiological studies by meta-analysis. Dose-related response to inhaled fluticasone propionate in patients with methacholine-induced bronchial hyperresponsiveness: a double-blind placebo-controlled study. bmj.com /cgi/content/full/323/7307/253   (1487 words)

EPA Dioxin Reassessment, Health Assessment, Volume III, Dose Response This does not imply that a simple proportional relationship between receptor binding and biological response can explain the diversity of biological responses described for dioxin and related compounds. It is likely that differences in response will be due to tissue and cell-specific factors that modulate the qualitative relationship between receptor binding, or more precisely, occupancy and response. Analyses in Chapter 8 illustrate that the slope of the dose-response curve for surrogate markers of low-dose response such as enzyme induction or indirect mutagenic activity on estimates of cancer risk using animal data are highly dependent on the assumptions that go into the modeling. www.cqs.com /dioxh98.htm   (1487 words)

Article 6 Even if MMP were politically viable, however, it is a poor response to Canada's most important political problems: regionalization of the party system, exclusion of the governing party from some regions, and concentration of the governing party caucus in a single region. Proponents of MMP generally argue that it is smaller, nationally focused parties like the Conservatives, NDP, Greens and Christian Heritage--that find it difficult or impossible to win pluralities in individual ridings and thus are underrepresented in the translation of seats to votes--which would benefit from MMP. But awarding MMP compensation seats at the provincial level would almost certainly stimulate regionally oriented parties, especially in a dramatically transformed party system where regional parties might be logical coalition partners for larger nation-wide parties. chci.wrdsb.edu.on.ca /library/lib99-00/pr4.htm   (1487 words)

Health Physics Instruments - Goleta, CA - Verenigde Staten Far West Technology, Inc. and Health Physics Instruments are manufacturers of radiation measuring instruments and devices including radiachromic dosimeters radiation let tepc proportional counters ion chambers survey meters geiger counters alpha beta gamma neutron survey x-ray monitors mca spectrometer emergency response instrumentation and calibration 81.144.182.35 /us-company-901166970.html   (1487 words)

RLC circuit - Wikipedia, the free encyclopedia Since electrical power is proportional to the square of the circuit voltage (or current), the frequency response will drop to The bandwidth is a measure of the width of the frequency response at the two half-power frequencies. Notice that this expression for Y(s) is the same as the one we found for the Zero State Response. en.wikipedia.org /wiki/RLC_circuits   (1487 words)

CodeGuru Forums - Printing in non-proportional font i've tried different fonts (Courier, FixedSys) and different sizes, but it always seems to print them proportional, i.e. I am trying to print to the laser printer in non-proportional font. Please rate if you think this response was useful for you www.codeguru.com /forum/archive/index.php/t-168004.html   (109 words)

00-0198.doc MEETING 222: The author of the ATTRIBUTE clause considered that it required a proportional font, but this was not explicit in the draft. Regarding the last sentence (proportional padding, in my words): All the products I know about that support proportional fonts also support proportional spaces. subrule a, delete "base", change "the font" to "all characters of the font", and add the following note indented below subrule a: "NOTE — An example of a font's unit of measure is the size of the lowercase letter 'i' in a proportional font. www.ncits.org /tc_home/j4htm/m224/00-0198.doc   (1560 words)

ACM Stimulus-Response Paper Pavlov uses the heuristic that when a stimulus and response are both transformations (e.g., Moves), each response parameter is inferred to be proportional to the corresponding stimulus parameter. She then demonstrates a stimulus of moving the accelerator slider bar, and a response of moving the car, and marks the response as periodic. Thus, the designer always demonstrates a triggering stimulus operation, but as she does she can demonstrate a condition that must be true when the stimulus operation occurs, or no response is executed. www.usfca.edu /~wolberd/pbd/acmSRpaper.htm   (4499 words)

Re: Word 97 and non-proportional fonts , in response to Word 97 and non-proportional fonts, posted by Kathy Koppinger on Wednesday, 7 October 1998, at 7:41 a.m. I have a user with a similar problem, and this might take care of it. www.thenakedpc.com /cgi-bin/annoyarchive.pl?read=2934   (116 words)

CodeGuru Forums - Printing in non-proportional font I am trying to print to the laser printer in non-proportional font. i've tried different fonts (Courier, FixedSys) and different sizes, but it always seems to print them proportional, i.e. Please rate if you think this response was useful for you www.codeguru.com /forum/archive/index.php/t-168004.html   (109 words)

Graduate Studies in Medical Physics Gas ionization devices such as proportional counters, by principle of their operation, provide a good basis for the development of suitable smart detectors able to provide in real time dosimetric, spectral, and diagnostic information on the radiation fields encountered in the nuclear power plant workplace. Once the primary standards are in place, the dose response of air-filled ionization chambers will be studied and compared to theoretical predictions since ionization chambers are the most common dosimetry tool in the clinical physics environment. These methods are based on the calibration of ionization chambers, the commonly used instrument in clinical dosimetry, in terms of absorbed dose by comparing them with a water calorimetric technique. www.ocip.carleton.ca /applmat/medphys.html   (109 words)

Lesson 7 This error is proportional to the magnitude of the intrinsic efficacy of the partial agonist and to the efficiency of the coupling of the tissue stimulus-response mechanism. Partial agonists by virtue of the occupation of a large number of receptors without eliciting a response, competitively block the effects of agonists of higher intrinsic efficacies or full agonists. In contrast, the partial agonist in the presence of concentration of the full agonist that produce responses higher than those of the partial agonist (more than 20%) has antagonistic effects, decreasing the response of the full agonist to the level of the maximal response of the partial agonist (20%). www.med.unc.edu /wrkunits/2depts/pharm/receptor/lesson7.htm   (1079 words)

Introducing doseresponse curves The simplest explanation is that the link between receptor binding and response is direct, so response is proportional to receptor binding. The term "dose-response curve" is occasionally used even more loosely to refer to experiments where you vary levels of some other variable, such as temperature or voltage. Some dose-response curves however, are steeper or shallower than the standard curve. www.curvefit.com /introduction89.htm   (1000 words)

Nikon MicroscopyU: Modulation Transfer Function In this case, however, the point spread function is replaced by the time response to a very short electrical impulse, and the optical transfer function is replaced by the imaging system's response to the sinusoidal electrical signal with respect to amplitude and phase. Because r is inversely proportional to numerical aperture and directly proportional to the illuminating wavelength, it follows that r and f(c) are also inversely proportional, a fundamental property of Fourier transforms (the width of a function is inversely proportional to the width of its transform). Therefore, the optical transfer function is a spatial frequency-dependent complex variable whose modulus is the modulation transfer function, and whose phase is described by the phase transfer function. www.microscopyu.com /articles/optics/mtfintro.html   (4055 words)

CTM: PID Tutorial We have reduced the proportional gain (Kp) because the integral controller also reduces the rise time and increases the overshoot as the proportional controller does (double effect). From the table shown above, we see that the proportional controller (Kp) reduces the rise time, increases the overshoot, and reduces the steady-state error. When you are designing a PID controller for a given system, follow the steps shown below to obtain a desired response. rclsgi.eng.ohio-state.edu /matlab/PID/PID.html   (1195 words)

Level Control Experiment At low proportional bands, the process was prone to oscillate before returning to a steady state and this oscillation in process variable tended to be away (offset) from the setpoint. In response to this, the valve position increasingly oscillates and would tend towards on-off control when the valve oscillates between the fully open and fully closed position. A proportional band of 100 indicates that the control valve will move over 100% of its range for a 100% measurement sensing range. www.chemeng.ed.ac.uk /~igds/Control/lab/level/answers3.html   (218 words)

IngentaConnect Acoustical imaging of underwater objects using the bistatic ramp ... This technique shows that the bistatic ramp response is proportional to the profile function of an underwater object based on the small bistatic angle assumption. The numerical examples demonstrate that the bistatic ramp response technique is still valid to obtain an excellent profile function even for the bistatic case with a fairly large bistatic angle. The numerical results also suggest that, if the object is of a more slender shape, then its bistatic ramp response will be closer to the exact profile function for a larger bistatic angle. www.ingentaconnect.com /content/iop/sms/2004/00000013/00000001/art00019   (218 words)

Hypotonic swelling-induced Ca2+ release by an IP3-insensitive Ca2+ store -- Mohanty et al. 281 (2): C555 -- AJP - Cell Physiology in response to hypotonic swelling is reversible and proportional to to that in response to hypotonic swelling (3). This increase in response to hypotonic swelling is ajpcell.physiology.org /cgi/content/full/281/2/C555   (4407 words)

Prozac and Placebo: There's a Pony in There Somewhere They suggest that the inclusion of a proportional measure that describes the relative amount of change that is distributed to active treatment effects and placebo response will help balance presentations on the effects of treatments. When one is presented only with the net effect of antidepressant treatment, in the form of an effect size or significance level, the fact that placebo response both is three times as large and accounts for over three times as many improved patients as the active medication is likely to be ignored. In each case, response defines the total amount of change associated with the implementation of a treatment or placebo, whereas effect defines that portion of the response that can be attributed to the medication or placebo. journals.apa.org /prevention/volume1/pre0010003c.html   (4407 words)

Tutorial on Internet Monitoring and PingER at SLAC We use ping to measure the response time (round trip time in milli-seconds (ms)), the packet loss percentages, the variability of the response time both short term (time scale of seconds) and longer, and the the lack of reachability, i.e. The response time is plotted as a blue line on a log axis, labelled to the right, and is the round trip time for 1000 byte ping payload packets. Numbers not close to 1 are typically caused by large variations in ping time between work hours and non-work hours, see for example the UCD ping response for Oct 3, 1996 for an example of the diurnal variations. www.slac.stanford.edu /comp/net/wan-mon/tutorial.html   (4407 words)

Vertex Effect at Rotating Principal Axes The load path is prescribed in the space of axial displacement versus rotation, and the response in the post-peak regime is of interest. The vertex effect is the strongest for abrupt changes of loading direction in the stress space or strain space, but arises for all loading paths (even smooth paths) significantly deviating from proportional loading (radial loading in the stress or strain space). The tests demonstrate that the response of concrete for load increments parallel in the stress space to the current yield surface is highly inelastic (i.e., much softer than elastic) in the peak load range and especially in the postpeak range. www.geocities.com /ferhun_caner/vertex7-4-01.html   (6700 words)

Human cone photoreceptor responses measured by the electoretinogram a-wave during and after exposure to intense illumination -- Paupoo et al. 529 (2): 469 -- The Journal of Physiology Online From a theoretical analysis, it is predicted that the amplitude of the response to a dim flash should be proportional to the product of three factors: (i) the magnitude of the circulating current, (ii) the amplification constant of phototransduction, and (iii) the fraction of visual pigment present. In their recent analysis of the Lamb and Pugh (1992) model of phototransduction, Thomas and Lamb (1999) showed that the amplitude (at any fixed time) of the response to a suitably dim flash should be proportional to the product of three factors: (i) the maximal response a The amplitude of bright flash responses provided a measure of the massed circulating current of the cones, while the amplitude of dim flash responses provided a measure of the product of the fraction of cone photopigment present, and the amplification constant of transduction within the cones. jp.physoc.org /cgi/content/full/529/2/469   (6700 words)

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