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Stepper is short for step-and-repeat camera. The stepper emerged in the late 1970s but did not become widespread until the 1980s. This was because it was replacing an earlier technology, the mask aligner. Aligners imaged the entire surface of a wafer at the same time, producing many chips in a single operation.
In probability and statistics, an elliptical distribution is any member of a broad family of probability distributions that generalize the multivariate normal distribution. Intuitively, in the simplified two and three dimensional case, the joint distribution forms an ellipse and an ellipsoid , respectively, in iso-density plots.
A stepper motor, also known as step motor or stepping motor, [1] is a brushless DC electric motor that rotates in a series of small and discrete angular steps. [2] Stepper motors can be set to any given step position without needing a position sensor for feedback. The step position can be rapidly increased or decreased to create continuous ...
The difference between steppers and scanners is that, during exposure, a scanner moves the photomask and the wafer simultaneously, while a stepper only moves the wafer. Contact, proximity and projection Mask aligners preceded steppers [39] [40] and do not move the photomask nor the wafer during exposure and use masks that cover the entire wafer.
When choosing between a treadmill and an elliptical, know that you can get a good workout with either one. The ultimate goal is to get moving in whatever works best for you, and that may come down ...
Switched reluctance motor with magnetic flux lines. The switched reluctance motor (SRM) is a type of reluctance motor.Unlike brushed DC motors, power is delivered to windings in the stator (case) rather than the rotor.
These include dc brush, dc brushless, stepper, or in some cases, even induction motors. It all depends on the application requirements and the loads the actuator is designed to move. For example, a linear actuator using an integral horsepower AC induction motor driving a lead screw can be used to operate a large valve in a refinery.
The oldest elliptical design is the "rear drive" type, the second generation elliptical design is the "front-drive" type, and the most recent elliptical design is the "center-drive" type. On some models, the incline of sloping roller-ramps beneath the pedal-links can be adjusted to produce varying pedal-motion paths. An adjustable ramp, whether ...
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