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The curves form a hysteresis loop. Hysteresis is the dependence of the state of a system on its history. For example, a magnet may have more than one possible magnetic moment in a given magnetic field, depending on how the field changed in the past. Plots of a single component of the moment often form a loop or hysteresis curve, where there are ...
Alternatively, a narrow hysteresis gap will lead to frequent on/off switching, which is often undesirable (e.g. an electrically ignited gas heater). Second, the onset of the step function may entail, for example, a high electrical current and/or sudden heating and expansion of metal vessels, ultimately leading to metal fatigue or other wear-and ...
Component of Stirling radioisotope generator is heated by induction during testing. Induction heating is the process of heating electrically conductive materials, namely metals or semi-conductors, by electromagnetic induction, through heat transfer passing through an inductor that creates an electromagnetic field within the coil to heat up and possibly melt steel, copper, brass, graphite, gold ...
Hysteresis is the difference noted between the upstroke and down stroke curve on heating and cooling of the element. Hysteresis is caused by the thermal inertia of the element and by the friction between the parts in motion.
Hysteresivity derives from “hysteresis”, meaning “lag”. It is the tendency to react slowly to an outside force, or to not return completely to its original state. Whereas the area within a hysteresis loop represents energy dissipated to heat and is an extensive quantity with units of energy, the hysteresivity represents the fraction of the elastic energy that is lost to heat, and is an ...
As an electric field is applied the dipoles are forced to align and polarisation is created, when the electric field is removed polarisation remains. The hysteresis loop depends on temperature and as a result as the temperature is increased and reaches T 0 the two curves become one curve as shown in the dielectric polarisation (Figure 5). [52]
Deadband is different from hysteresis. With hysteresis, there is no deadband and so the output is always in one direction or another. [clarification needed] Devices with hysteresis have memory, in that previous system states dictate future states. [clarification needed] Examples of devices with hysteresis are single-mode thermostats and smoke ...
Magnetic hysteresis can be characterized in various ways. In general, the magnetic material is placed in a varying applied H field, as induced by an electromagnet, and the resulting magnetic flux density (B field) is measured, generally by the inductive electromotive force introduced on a pickup coil nearby the sample.
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