Search Results for pitch

... to the following exchange in which the interviewer uses the device of a “pitch black night” to try to reduce the appeal of the preferred dock frame of reference: I: What if it is pitch black, a moonless night? The first explosion makes a flash of light, and then, two seconds later, the second explosion goes off...

... of a wind turbine, a drivetrain shaft and an electric generator. The main control objective considered in Cui et al. (2018) was to maximize the wind power capture and at the same time protect the operating units from fatigue. The manipulated inputs considered were the desired pitch angle...

... the frequency of the planets to be the pitch of a note. It was explained that Mercury, the planet with the shortest orbital period, would produce the highest notes, and Saturn, the longest planet, would produce the lowest notes ( Ferguson, 2013 ; and Jho, 2014 ). Even religious dogma plays a role in developing...

... . The receiver has a pitch angle, and its aperture points to the field’s third row of heliostats. The operating fluid in the receiver’s heat transfer tubes was assumed to be air. Table 5.4 Experimental heliostat field parameters. Parameter Value Calibration target size 2 × 2 m²...

... of the MOSFETs used in the converter while maintaining high-voltage capability. FIG. 13.6 Simplified synchronous boost converter schematic. Transistors typically consist of several fingers connected in parallel to achieve the desired current capability. Gate-to-gate pitch and device layout must be taken...

... et al., 2011 ) in order to allow reconfigurability. MEMS-actuated compact spectrometers use stretchable pitch variable structures ( Tormen et al., 2017 ; and Ravindran et al., 2021 ), phase gratings, and rotation ( Miniaturized MEMS Grating Spectrometer, 2021 ), and find...

... micrographs of MacEtch-formed β-Ga₂O₃ structures with (b) and (c) pyramid, (d) and (e) trapezoid-like, and (f) and (g) blade structures. (h) Height, top width, pitch and (i) angles between upper and lower sidewall (angel 1) and top plane and upper sidewall (angle 2) of β...

..., the Cornell group publishes a series of high-impact and illuminating device results based primarily on controlling the RESURF effect through optimizations of the fin/trench geometry (fin width, trench depth, pitch size) to satisfy design constraints on R_ON,sp, reverse leakage, and maximum...

... improves yield in fine pitch lithography. In this regard, two possible approaches of using ion implantation for inter-device isolation can be followed ( Pearton, 1990 ). The first approach is based on the creation of chemically induced deep levels by implanting ions that result in mid-gap electronic levels...

... decreases. The difference in air pressure across the two sides of the blade creates both lift and drag. The force of the lift is stronger than the drag and this causes the rotor to spin. There are two types of speed control of wind turbines: pitch and stall control: In a pitch control, the rotor blades...

... such as aeroelastic analyses of wind turbines during flutter, information about the pitching moment (M) acting on a point of the airfoil will be needed. The point is usually located at the quarter chord position (c/4) measured from the leading edge. In this book, the pitching moment...

... Introduction to Fluid Mechanics ( John Wiley & Sons , 2016 ). Ramsay , R. , Hoffman , M. , and Gregorek , G. , Effects of Grit Roughness and Pitch Oscillations on the S809 Airfoil ( National Renewable Energy Lab , Golden, CO , 1995 ). Ramsay , R. , Hoffman , M...

... , R. D. , “ Fixed pitch rotor performance of large horizontal axis wind turbines ,” in Large Horizontal-Axis Wind Turbines, 28–30 July 1981 , Cleveland, Ohio ( NASA , 1982 ). Wenz , F. , Boorsma , K. , Lutz , T. , and Krämer , E. , “ Cross-correlation-based approach to align...

... to the tip area. One operating condition (a combination of the wind speed, rotational speed, pitch angle) of the rotor shall produce one unique set of data. This is not sufficient for engineering model computations because polar data will be required for each blade section. To account for this aspect...

... by pitch–angle changes ,” in IEA R&D WECS Joint Action on Aerodynamics of Wind Turbines, 1st Symposium, Lyngby, Denmark (IEA, 1986), pp. 58 – 79 . Pitt , D. M. and Peters , D. A. , “ Theoretical prediction of dynamic-inflow derivatives ,” in 9th European Rotorcraft Forum, 13–15...