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Topic: Hysteresis

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In the News (Fri 23 Feb 18)

  Hysteresis in magnetic materials
The lack of retraceability of the magnetization curve is the property called hysteresis and it is related to the existence of magnetic domains in the material.
It is customary to plot the magnetization M of the sample as a function of the magnetic field strength H, since H is a measure of the externally applied field which drives the magnetization.
Because of hysteresis, an input signal at the level indicated by the dashed line could give a magnetization anywhere between C and D, depending upon the immediate previous history of the tape (i.e., the signal which preceded it).
hyperphysics.phy-astr.gsu.edu /hbase/solids/hyst.html   (315 words)

 Hysteresis and Avalanches
You also may have heard that supercooled water was another example of hysteresis: hysteresis is characteristic of first-order phase transitions.
We've written an applet that allows you to see the hysteresis loop formed along with the avalanches, and allows you to change the disorder away from the critical point.
Try clicking inside the hysteresis loop on the left to raise and lower the external field (horizontal axis); you should be able to generate subloops inside the hysteresis loop.
www.lassp.cornell.edu /sethna/hysteresis/hysteresis.html   (950 words)

  Adding Extra Hysteresis to Comparators - Maxim/Dallas
We use it in engineering to describe an operation that is not symmetrical, i.e., its path from A to B is not the same as from B to A. Hysteresis is found in the phenomena of magnetism and nonplastic deformation, and in electronic circuits such as comparators.
Hysteresis is designed into most comparators, usually with a value of 5mV to 10mV.
When the comparator's input voltages are equal, the hysteresis causes one input to move quickly past the other, thereby removing the input voltages from the region where oscillation occurs.
www.maxim-ic.com /appnotes.cfm/appnote_number/3616   (1280 words)

  NationMaster - Encyclopedia: Hysteresis
Hysteresis is a property of systems (usually physical systems) that do not instantly follow the forces applied to them, but react slowly, or do not return completely to their original state: that is, systems whose states depend on their immediate history.
When hysteresis occurs with extensive and intensive variables, the work done on the system is the area under the hysteresis graph.
Hysteresis represents states, and the characteristic curve shape is sometimes remiscent of a two-value state, also called a bistable state.
www.nationmaster.com /encyclopedia/Hysteresis   (427 words)

 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal   (Site not responding. Last check: )
Hysteresis phenomena occur in magnetic and ferromagnetic materials, as well as in the elastic and electromagnetic behavior of materials, in which a lag occurs between the application and the removal of a force or field and its subsequent effect.
For instance, the properties of hysteresis are applied when constructing permanent memory for computers: hysteresis allows most superconductors to operate at the high currents needed to create strong magnetic fields.
Hysteresis occurs because measured heat dissipation depends on sensor water content, and the sensor water content–matric potential relationship is hysteretic.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=hysteresis   (2470 words)

 Modelling of Hysteresis Loops During Thermomechanical Fatigue
The hysteresis loops obtained during thermomechanical fatigue testing of the stainless steel 253 MA and the ODS alloy PM2000 have been analysed using a model taking elastic, plastic, and creep deformation into account.
Hysteresis loops both from in-phase and out-of-phase cycling were successfully reproduced.
By integrating the fatigue and creep damage along the hysteresis loops, the cyclic lifetimes of 253 MA were predicted.
www.astm.org /DIGITAL_LIBRARY/STP/PAGES/STP11425S.htm   (128 words)

Hysteresis means "lag of effect", or a delay before an action.
Hysteresis is a very important part of menus and controls, even though most users are unaware of it.
But Microsoft has not made most of the Hysteresis items standard, they haven't documented some of it well, they haven't enforced it as a standard, and so Hysteresis is only there some of the time and it behaves in dramatically different ways.
www.mackido.com /Interface/hysteresis.html   (1454 words)

 RRG/Learn More/Advanced Topics/Hysteresis
Hysteresis, in its simplest formulation, is a loss of energy in a material during cyclic excitation.
It is interesting to note that we commonly use the term "lost" with reference to the energy released during a hysteresis effect.
In the field of Thermodynamics the energy released in a hysteresis cycle is not considered lost, it is taken as a measure of the work done by the system.
www.robotics.utexas.edu /rrg/learn_more/high_ed/hysteresis   (227 words)

 Digiquartz® Products Hysteresis Study
Pressure hysteresis is usually measured by applying a sequence of test pressures from a lower limit to an upper test limit and then repeating the series of pressures in the decreasing pressure direction.
For each transducer, hysteresis was calculated as the average indicated pressure at 965 hPa taken on the decreasing pressure part of the cycle minus the average indicated pressure at 965 hPa taken on the increasing pressure part of the cycle.
Individual estimates of hysteresis for each of the 23 barometers in the test group are histogrammed below.
www.paroscientific.com /presshysteresis.htm   (816 words)

 Improve the Squelch in Your Monitor Receiver
Too much hysteresis in a squelch circuit forces one to keep the squelch at a tighter setting, missing weaker signals when scanning or searching.
Basically, hysteresis prevents weak signals from "popping" the squelch open and closed rapidly, which would be very annoying to the listener.
Hysteresis is usually implemented by providing feedback from the squelch gate input to output, through a resistor.
www.repairfaq.org /REPAIR/F_MR_Squelch.html   (633 words)

 Magnetic  Hystersis
These materials also show hysteresis and the magnetisation does not return to zero after the application of a magnetic field.
Illustrated in the first quadrant of the loop is the initial magnetisation curve (dotted line), which shows the increase in polarisation (and induction) on the application of a field to an unmagnetised sample.
The hysteresis means that the polarisation lags behind the applied field and will not immediately switch direction into the third quadrant (i.e.
www.aacg.bham.ac.uk /magnetic_materials/hysteresis.htm   (1075 words)

 Hysteresis Brake Applications
Magtrol Hysteresis Brakes are widely used in load simulation applications for life testing on electric motors, actuators, small gas engines, gearboxes, and many other rotating devices and assemblies.
The ability of hysteresis devices to withstand high temperatures for prolonged periods of operation without suffering any degradation to their magnetic structures makes them ideal for these applications, as well as environmental testing, and even applications in outer space.
Their ability to produce torque independent of speed makes Hysteresis Brakes the preferred method of braking employed in many dynamometers used for performance testing of motors, actuators, gas engines, etc.
www.magtrol.com /tensioncontrol/hbapplications.htm   (327 words)

 Dataforth - Hysteresis Specifications
Hysteresis specifications are often combined with other phenomena such as repeatability, reproducibility, linearity, and dead band as part of the overall product specifications.
The fundamental phenomenon of hysteresis is the inability of a unit to provide the same output for the same input after the input has had a traversal from upscale to downscale or downscale to upscale with all other errors zero.
The difference between Vout-x and Vout-z is the hysteresis error usually expressed as a percent of full-scale output.
www.dataforth.com /catalog/doc_1543.html   (244 words)

 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide, 12.1(22)EA7 - Configuring Catalyst 2955 Switch ...
The hysteresis threshold is defined as the ratio between the alarm clear threshold to the alarm set threshold, expressed as a percentage value.
The FCS hysteresis threshold is applied to all ports on the Catalyst 2955 switch.
The hysteresis setting prevents the toggle of an alarm when the actual bit error rate fluctuates near the configured bit error rate.
www.cisco.com /en/US/products/hw/switches/ps628/products_configuration_guide_chapter09186a0080648d78.html   (2877 words)

 Ogura Industrial Corp. - Industrial Products - How They Work - Hysteresis Powered Clutch
These disks have the ability to become magnetized depending upon the strength of the flux (this dissipates when flux is removed).
This means, as the rotor rotates, magnetic drag between the rotor and the hysteresis disk take place causing rotation.
In a sense, the hysteresis disk is pulled after the rotor.
www.ogura-clutch.com /products/industrial/howtheywork/hysteresis-powered-clutch.html   (388 words)

 International Trade Hysteresis in Export
Hysteresis in supply implies that the market lost when a country’s currency appreciates, may not necessarily be regained when the currency returns to its original level.
They develop an econometric model of export determination where the presence of sunk costs causes discontinuous behaviour and hysteresis so that an individual exporter’s decision to stay in or out of the market depends on the current value of the exchange rate as well as its past history.
The paper finds strong evidence in favour of the presence of pricing-to-market and hysteresis only in the case of Japanese exports.
www.cepr.org /pubs/bulletin/dps/dp1352.htm   (318 words)

 Ogura Industrial Corp. - Industrial Products - How They Work - Hysteresis Permanent Magnet Clutch or Brake
Function: Most units contain a hysteresis disk, which is directly attached to the hub that passes through the clutch/brake.
The opposing circular magnets set up magnetic flux, which causes drag on the hysteresis disk, which in turn, causes drag to the hollow hub in the unit.
As the poles are changed from a north to south alignment, the flux passes directly through the hysteresis material, reducing the amount of drag on the hollow hub of the unit.
www.ogura-clutch.com /products/industrial/howtheywork/hysteresis-permanent-magnet-clutch.html   (448 words)

 Hysteresis - The lagging of an effect behind its cause
Hysteresis is a local band from Tiffin Ohio.
Everyone in the band also liked it, so it was decided, Hysteresis was their new name.
Hysteresis is a rock to light metal band.
www.freewebs.com /sleeperhold/Index.htm   (135 words)

 Hysteresis Loop
A hysteresis loop shows the relationship between the induced magnetic flux density (B) and the magnetizing force (H).
From the hysteresis loop, a number of primary magnetic properties of a material can be determined.
In other words, it is a material's ability to retain a certain amount of residual magnetic field when the magnetizing force is removed after achieving saturation.
www.ndt-ed.org /EducationResources/CommunityCollege/MagParticle/Physics/HysteresisLoop.htm   (625 words)

 Compliance, Hysteresis, and Collapsibility of Human Small Airways -- TIDDENS et al. 160 (4): 1110 -- American Journal ...
In chronic obstructive pulmonary disease (COPD) airway inflammation is associated with increased airway wall thickness (1).
O expressed as the percentage of the area of the maximal hysteresis.
Smooth muscle tone is known to be an important contributor to hysteresis (33, 34).
ajrccm.atsjournals.org /cgi/content/full/160/4/1110   (5265 words)

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