The electrical engineering handbook CH053
The electrical engineering handbook CH053
... Recall that for type II materials the boundary between the normaland superconducting regions lowers the overall energy of the system. Therefore, the flux in the superconductorcreates as many ... side of the expression is the power flowing into the region. By taking the time derivative of the energy density and appealing to Faraday’s and Ampère’s laws to find the time derivatives of the field ... is(53.18)In other words, once the supercurrent channel carries its maximum amount of current, the rest of the currentis carried through the normal channel.Just as the correlated motion of the superelectrons...
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The electrical engineering handbook CH107
... both.b.Reduce the area of high luminance causing the glare condition.c.Increase the angle between the glare source and the line of vision.d.Increase the luminance of the area surrounding the glare ... Ratios .The ability to see details depends on the contrast between the detail andits background. The greater the contrast difference in luminance, the more readily the seeing task is performed. The ... application, they are likely to experience further development in the coming years.BallastsFluorescent. Electronic ballasts are now available for the F40T12, the slimline, the new T8 lamps, and otherenergy-saving...
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The electrical engineering handbook CH051
... tensile stress in the x-direction, for example, will strain the lattice in the xy-planeand destroy the three-fold symmetry, thereby lifting the degeneracy of the energy minima. However, the four-fold ... LLCAccording to the deformation potential theory, the strain will shift the energy of all the states in a given bandextremum by the same amount, i.e., the valley moves along the energy scale ... perpendicular to the valley. For an applied E field parallel to the stress, the conductivity will increase (i.e., the resistivity decreases) relative to the unstressed state because of the increase in the...
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The electrical engineering handbook CH052
... Ehrlich A.C. The Hall Effect” The Electrical Engineering Handbook Ed. Richard C. DorfBoca Raton: CRC Press LLC, 2000 © 2000 by CRC Press LLC 52 The Hall Effect 52.1Introduction52.2Theoretical ... is(52.11)where the subscript specifies the band number and mi, the effective mass for each band. These masses neednot be equal nor the same as the free electron mass. In effect, some of the features ... the study of the nature of electrically conducting materials, the Hall effect has a number of direct practical applications. For example, the sensor in some commercialdevices for measuring the...
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The electrical engineering handbook CH054
... G T is the thermal conductance from the element to the environment, t T is the thermal time constant of the element, t E is the electrical time constant of the element, ... element, R G is the electrical resistance across the element, h is the emissivity of the element for the radiation being detected, and A is the sensitive area of the element.It is ... chemically and electrically, because of their low Curie temperatures. Furthermore,their dielectric loss is rather high, so that the FD figures are not so favorable. Lithium tantalate, on the otherhand,...
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The electrical engineering handbook CH055
... times at stresses in the vicinity of the operating stress should yield the value of the effective service life under the operating stress. The slope of the line determines the exponent n, which ... assumednot to disturb the trapped charge; the received electrical signal is then correlated with the acoustical wave todetermine the profile of the trapped charge. Errors in the measurement would ... s–1. The right-hand side ofEq. (55.18) is equal to the dielectric loss dissipated in the dielectric in J s–1, where E is the external field, e¢ the real value of the permittivity, and tan␦ the...
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The electrical engineering handbook CH056
... employed. The mercury thermometerwas mentioned in the Introduction as a nonelectrical sensor. The most commonly used electrical temperaturesensors are thermocouples, thermistors, and resistance thermometers. ... temperature.As the electrons in the metal gain thermal energy, they move about more rapidly and undergo more frequentcollisions with each other and the atomic nuclei. These scattering events reduce the ... of the wire to a cantilever beam, with one end of the wire at the attachedbeam end and the other at the free end. The cantilever beam free end moves in response to an applied force,such as the...
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The electrical engineering handbook CH057
... data, the same thermal process can be applied while reversing the direction of the bias magnetic field.To read the stored information optically, the Kerr effect is used to detect the presence of these ... rotation.Furthermore, the direction of this twist is either clockwise or counterclockwise, depending on the orientationof the perpendicular magnetic moment, which is either upward or downward. Therefore, ... light waves. The superposition of these two waves produces a linearlypolarized wave. The plane of polarization of the resultant wave rotates as one circular wave overtakes the other. The rate of...
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The electrical engineering handbook CH089
... after the paper andribbon move together away from the printhead, the partially cooled ink layer adheres better to the paper than© 2000 by CRC Press LLCto the ribbon substrate. The ribbon is then ... length, and lz the distance from the upstream end of the deflection plates to the paper.Drop deflection can be either binary or analog. With the former, the drop either reaches the paper or is ... represents the kinetic energy of the drop. The remaining energy is thermallydissipated in the ink and device structure.When the thermal energy in the superheated layer is depleted, the bubble...
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The electrical engineering handbook CH106
... vehicles, etc. are familiar terms. There is some variation among them relative to the electronicsembedded in the systems and the options available to the driver. The same is true for railroads, ... All of these subsystems interact with each other and many also interact with subsystems externalto the vehicle.Some of the initial design considerations for vehicles include:•Will the vehicle ... which cars may soon have analogous functions. The electrical and electronicsystems and controls account for 15 to 30% of the cost of the vehicle. The major vehicle subsystems include propulsion,...
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