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Topic: Open loop

	Strange loop - Open Encyclopedia (Site not responding. Last check: 2007-10-21)
		A strange loop is a case of self-reference which affects (or even damages) the original item, possibly causing a paradox.
		This, by itself, is not enough to be a strange loop (it's merely self reference, and is common practice for a compiler).
		The concept of a strange loop was proposed and extensively discussed by Douglas Hofstadter in Gödel, Escher, Bach.
	open-encyclopedia.com /Strange_loop (207 words)

	Oilgear and Open Loop by Charle (Site not responding. Last check: 2007-10-21)
		Open Loop Energy is the only authorized "repair facility" and distributor of steering pumps for 830E and 930E haul trucks in New Mexico, Arizona and Nevada.
		Safford Facility: Open Loop Energy operates a 20,000-square-foot facility in Safford, AZ where we perform machining, welding, fabrication and component rebuilding and testing, in addition to hydraulics, lubrication, air tools and pneumatics.
		Open Loop Energy has the knowledge to do what it takes, because we're backed by many years of experience in equipment innovation and product testing.
	www.openloop.net /oilgearole.htm (315 words)

	Ground Loop: Geothermal Explanation
		Since the temperature of ground water is nearly constant throughout the year, open loops are a popular option in areas where they are permitted.
		Horizontal closed loop installations are generally most cost-effective for small installations, particularly for new construction where sufficient land area is available.
		Fluid is pumped just as for a conventional closed loop ground system where conditions are suitable, the economics are very attractive, and no aquatic system impacts have been shown.
	cgibin.erols.com /mike01/cgi-bin/track.pl?p=/geothermal.htm (2034 words)

	Asymptotic Rate of an Open Loop Markov Model
		Open Loop and Closed Loop Markov Models for a derivation of this result.) If, on the other hand, we decide to treat this as an open loop model, allowing all probability to eventually accumulate in State 2, what is the asymptotic hazard rate for State 2? Taking P
		In general, for any Markov model, the asymptotic open loop rate is always equal to the negative of the dominant eigenvalue, where "dominant" means the smallest absolute value.
		Of course, the asymptotic rate of the open loop system does not generally equal the asymptotic rate of the closed loop system. As shown in the note on Two Properties of Markov Models, the latter is given by
	www.mathpages.com /home/kmath559/kmath559.htm (1162 words)

	Open Loop Control (Site not responding. Last check: 2007-10-21)
		Open-loop control appears to occur in situations (such as the Proportional condition, where control -- measured as RMS deviation -- is about the same before and after the cursor disappears) where it is possible to control a perceptible correlate of the cursor (the visible mouse arrow).
		Notice that you can achieve good control in the "open loop" phase of the Proportional control condition becuase you are actually controlling a perception (of the mouse arrow) that corresponds to the position of the cursor.
		Notice that, in the Integral control condition, you cannot achieve good control even though you are still able to see the mouse arrow in the "open loop" phase because the mouse arrow no longer corresponds to the position of the invisible cursor.
	www.mindreadings.com /ControlDemo/OpenLoop.html (395 words)

	Open Loop Tracking Proposal (Site not responding. Last check: 2007-10-21)
		A baseline would tell us open loop tracking performance which in turn would tell us what the bandwidth of the autoguider should be.
		The open loop centroid drift will be compared to telescope specs and historic data to determine if open loop tracking has degraded over the years.
		Additionally, the open loop data will be compared to the closed loop data after it is processed off line through a filter equivalent to that of the guide loop.
	www2.keck.hawaii.edu /observing/etac/proposals/open_lool_dec03.html (249 words)

	Open loop (Site not responding. Last check: 2007-10-21)
		Open loop is the mobile's estimate of the power at which it should transmit.
		The open loop estimate is based on the strength of the pilot signal the mobile receives.
		Open loop is used any time the mobile transmits.
	www.qualcomm.com /ProdTech/cdma/training/cdma25/m6/m6p10.html (56 words)

	Optical Scanning - G Series Open Loop Galvanometer Scanner (Site not responding. Last check: 2007-10-21)
		A G Series Open Loop galvanometer is a small, rugged, and efficient beam positioning device.
		G Series Open Loop Scanners with mounted mirrors can be driven sinusoidally at up to 85% of their Natural Resonant Frequency and at any amplitude up to the rated scan angle.
		Using the GSI Group model A102 open loop driver, approximately 5% of the Natural Resonant Frequency can be achieved with a sawtooth, triangle, or square wave command waveform.
	www.gsilumonics.com /product_data_sheets_en/295.html (153 words)

	Closed Loop Model of Baroreflex (Site not responding. Last check: 2007-10-21)
		The open loop relationship between carotid sinus pressure and heart rate is realistic.
		When the reflex loop is closed (arterial pressure = carotid sinus pressure) the system is essentially stable but shows small apparently chaotic beat to beat variability in rate and pressure which disappear if the reflex is interrupted.
		Figure 2 shows the simulated open loop response of arterial pressure (Pa) and heart rate (HR) to changing carotid sinus pressure (Pcs) when the carotid sinuses are isolated from the rest of the circulation.
	www.rybak-et-al.net /rose.html (1107 words)

	open-loop.org :: A Chicago Surveillance Camera Mapping Project
		Open-Loop.org is a collective that documents the video surveillance in Chicago’s downtown area, commonly known as the Loop.
		Whether operated by government or private entities, these devices establish a constant watch on the activities taking place in much of the Loop.
		In a democratic society, the degree of social and legal control available to the government should be determined by the willingness of its citizens to submit to institutional regulation.
	www.open-loop.org (160 words)

	diyAudio Forums - How to measure open loop freq response
		Generally it is done by modifying temporarily the feedback loop, so that the DC feedback stays intact to keep the amp in DC balance, but making the AC feedback zero.
		So if the opamp has an open loop gain of 100,000 and swings 10 volts then the change in voltage between the + and - inputs will be 10/100,000 volts = 100uV.
		Open loop is Output voltage / diff input voltage.
	www.diyaudio.com /forums/showthread.php?postid=46614 (501 words)

	Open Closed Loop Geothermal Systems Pennsylvania Poconos Heating Systems (Site not responding. Last check: 2007-10-21)
		Closed loop systems are becoming the most common type of geothermal heating/cooling system.
		Closed loop systems consist of a network of polyethylene plastic pipe buried in the ground either in horizontal trenches, but more commonly vertical wells.
		U-shaped loops of pipe are inserted in the holes.
	www.moyerwelldrilling.com /openclosed.htm (440 words)

	Corral Forums - questions about when in open loop
		But, without them operating in Closed Loop, the long term fuel trims that are normally applied during Open Loop operation (based on the short term fuel trims during Closed Loop Operation) could not be applied.
		Open loop relies on base tables, with modifiers according to input from various sensors and long term fuel trim.
		The only benefit you could have by running in Open Loop all the time would be if you were dyno tuned by someone who knows what they are doing.
	www.corral.net /forums/showthread.php?t=405265 (392 words)

	Open Loop Solar Water Heating Systems
		Open Loop Systems are suitable for single application domestic hot water (DHW) systems, in mild and moderate climates.
		An Open Loop System is for climates where there is no risk of freezing.
		It does, however recirculate from the colder bottom of the tank and supply pipes, and there are minimal losses in the loop and none through the collector.
	www.thermotechs.com /open.htm (324 words)

	Simple Op-Amp-based Headphone Amplifiers
		Interesting because it is difficult to test an amplifier with an open loop, whether in reality or in simulation.
		Opening the loop will throw off the DC bias points, which rely on the feedback loop to stabilize, without the feedback the output latches up to one of the power supply rails.
		So, the secret is not to open the feedback loop, while measuring the open loop gain.
	www.beigebag.com /case_amp6.htm (227 words)

	Ziegler-Nichols Closed Loop Tuning (Site not responding. Last check: 2007-10-21)
		The open loop method is useful for most process control loops.
		The Closed Loop method determines the gain at which a loop with proportional only control will oscillate, and then derives the controller gain, reset, and derivative values from the gain at which the oscillations are sustained and the period of oscillation at that gain.
		Ensure that the process is Òlined outÓ with the loop to be tuned in automatic with a gain low enough to prevent oscillation.
	users.aol.com /JohnShaw/znclosed.html (275 words)

	Open Loop Solar Water Heating Systems
		The supply and return loop holds about 5 pints of water so we are really more concerned about protecting the piping than the manifold, which is well insulated.
		Thermomx Open Loop Systems Maximize the use of solar energ, and insure the least heat loss of any system.
		It does, however recirculate from the colder bottom of the tank, and there are minimal losses in the loop and none through the collector.
	www.thermomax.com /open.html (350 words)

	Open Loop Current Sensors from Sypris Test & Measurement - Magnetics Division
		Most open loop sensors contain circuitry to provide temperature compensation and calibrated high level voltage output.
		Open loop current sensors measure DC and AC currents and provide electrical isolation between the circuit being measured and the output of the sensor.
		Typically, open loop sensors cost less than closed loop sensors.
	www.designinfo.com /FeaturedProducts/Detail/SyprisTestandMeasurementMagnetic/Open_Loop_Current_Sensors/12027/0 (185 words)

	open loop - Caravan/Voyager - Car Discussion Forums - Helping the Automotive Community Online (Site not responding. Last check: 2007-10-21)
		During OPEN LOOP modes the PCM receives input signals and responds according to preset PCM programming.
		Inputs from the upstream and downstream heated oxygen sensors are not monitored during OPEN LOOP modes, except for heated oxygen sensor diagnostics (they are checked for shorted conditions at all times)
		During CLOSED LOOP modes the PCM monitors the inputs from the upstream and downstream heated oxygen sensors.
	www.automotivehelper.com /topic315560.htm (365 words)

	:: LOOP FILMWORKS ::
		We offer the ability to deliever projects from pitch to post-production, whether it is live action, traditional animation or digital.
		Inevitable press is in the near future and we are all a-glow.
		LOOP's work is highlighted throughout this book, check it out kids.
	www.loopfilmworks.com (922 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		The DC motor is replaced with a stepper motor for an open loop system, and a servo-motor for a closed loop system.
		Due to the inherent open loop nature of these systems, the torque delivered by stepper motor is a function of the speed, and the motion profile.
		Development of a closed loop system is somewhat more demanding than a simple open loop test, since the definitions of the command signal, and the response signal as described earlier has to followed.
	ceaspub.eas.asu.edu /cement/control3.html (2266 words)

	Open-Loop Response Testing Improves Process (Site not responding. Last check: 2007-10-21)
		Approximately half of all loop problems relate to control valve performance, and the others are largely due to poorly tuned controllers.
		Relying totally on autotuning, especially on loops that continually wander away from setpoint, is not recommended.
		Individual loop stability allows optimization of the control system and has a positive impact on the overall process.
	www.manufacturing.net /ctl/index.asp?layout=articlePrint&articleID=CA194251 (1041 words)

	Open & Closed Loop Geoexchange Systems
		This option is practical only where there is an adequate supply of relatively clean water, and all local codes and regulations regarding groundwater discharge are met.
		Since water transfers heat much better than soil, closed loop systems are often located in lakes or ponds by submerging GeoExchange loop coils in the water.
		Since these types of loops usually require minimal excavation, installation costs can be reduced.
	www.energy.iastate.edu /efficiency/commercial/gt-open.html (284 words)

	Open Loop Protection Suppliers from the PowerSourcing Directory of Open Loop Protection
		Power Sourcing is your best source for finding open loop protection suppliers.
		We are dedicated to bringing qualified open loop protection buyers and suppliers together.
		Find a supplier of open loop protection and thousands of other products and services for purchasing and research.
	www.powersourcing.com /sf/openloopprotection.htm (116 words)

	Open-Loop: A project to document video surveillance in Chicago's Loop (Site not responding. Last check: 2007-10-21)
		Perhaps you've heard that Chicago's "Loop" is heavily monitored by video, with Mayor Daley a big proponent of video surveillance.
		But the folks at Open-Loop do, and they've got an interesting website set up with the goal of documenting the location of every surveillance camera in the Loop (link via sotto.org).
		north of the Chicago River), not the "Loop" area (the distinction is fuzzy).
	underscorebleach.net /jotsheet/2005/01/chicago-loop-video-surveillance (284 words)

	Control Engineering - Open-loop control offers some advantages (Site not responding. Last check: 2007-10-21)
		Every feedback controller has a different strategy for accomplishing its particular mission, but all use some variation on the closed-loop control algorithm--measure a process variable, decide if its value is acceptable, apply a corrective effort as necessary, and repeat the whole operation ad infinitum.
		Disabling the feedback path in a closed loop control system generally reduces accuracy but may be necessary to stabilize the loop.
		Open loop controllers, on the other hand, do not use feedback.
	www.manufacturing.net /ctl/article/CA188321?pubdate=10%2F1%2F1998 (702 words)

	Corral Forums - Open Loop / Closed Loop Read
		I know my car runs very rich and runs very strong in open loop, i guess thats right(on start up), then a minute or so after startup it starts running way lean and like total crap.
		I know it has to do with open and closed loops, if ther was only a way i could make it run like it does on start up, that would be great.
		If you wanted to fool the ECU into staying in open loop, then you could pull the ECT sensor and place a resistor in there to simulate a low temp condition.
	www.corral.net /forums/showthread.php?t=129219 (553 words)

	7-3 THE NYQUIST STABILITY CRITERION
		It is the reciprocal of the open loop gain at the frequency where phase is –180 (known as the phase crossover frequency).
		The phase margin can also be determined easily from the open loop frequency response.
		Phase margin can be read straight off the open loop Bode plot as shown in Figure 2(b).
	www.engr.udayton.edu /faculty/rkashani/mee527/nyq_stab/nyq_stab_margins.htm (605 words)

	Open Loop vs. Closed Loop Quiet Posture in Reduced Gravity (Site not responding. Last check: 2007-10-21)
		Open and closed loop posture control will be studied.
		Open loop control is evaluated by having the subjects first align themselves with the target, then close their eyes and attempt to maintain the same posture in absence of visual feedback.
		Joint angles (from photographs) and reaction forces will be compared between both open and closed loop scenarios as well as to previous studies performed at the Spaces Systems Laboratory (SSL) as well as in the literature.
	www.tsgc.utexas.edu /floatn/1997/teams/maryland.html (279 words)

	Serebella Contents Opa---locka, Florida-Open-loop (Site not responding. Last check: 2007-10-21)
		opening a door to access the room behind it).
		(I will open the shop an hour early tomorrow.
		It uses material from the Wiktionary page "Open".
	www.serebella.com /encyclopedia/contains-322856-322903-Opa-locka,_Florida-Open-loop.html (98 words)

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