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Near and far fields of antennas. In preparation for a propagation experiment, a researcher places a field measuring instrument (another antenna) at a distance of 150 m from the transmitting antenna, which operates at 30 GHz. A colleague indicates that this is improper because the measuring instrument is not in the far field of the antenna. Is the instrument in the near or the far field of the transmitting antenna?
a large plate contains a central crack of length 2 mm and is subjected to a cyclic stress normal to the crack which
List several advantages of using as state variables, the across variables of independent A-type energy storage elements and through variables of independent T-type energy storage elements, in the development of a state-space model for an engineeri..
The parting line in injection molding is which one of the following: (a) the lines formed where polymer melt meets after flowing around a core in the mold, (b) the narrow gate sections where the parts are separated from the runner, (c) where the clam..
you are blanking a square using a straight edge punch. if the punch is angled to be at a shear angle of 10 degrees how
Set up a vector force diagram for model (5.14) and illustrate possible trajectories for the economy in (Y,r)-space for each of the following
If a single deposit of $25000 is invested at 1.75% yearly interest, what equal year-end withdrawals can be made each year for 10 years, leaving nothing in the fund after the 10th withdrawal? How much money was made in interest over the initial invest..
A gas within a piston-cylinder assembly executes a Carnot power cycle during which the isothermal expansion occurs at TH = 720 K and the isothermal compression occurs at TC = 340 K. Determine: (a) the thermal efficiency (b) the percent change in ther..
Determine whether the operation of your proposed power plant is economically feasible, by comparing the cost of producing electricity with your design with the rate that the local utility company charges per kW.h.
a gas turbine assume ideal brayton cycle has a pressure ratio of 10. it is connected to an electric generator with an
Two channels are welded to a ×12-in. steel plate as shown. Determine the width d for which the ratio Ix /Iy of the centroidal moments of inertia of the section is 16.
A cylindrical specimen of a metal alloy 51.3 mm long and 11.1 mm in diameter is stressed in tension. A true stress of 350 MPa causes the specimen to plastically elongate to a length of 57.9 mm. If it is known that the strain-hardening exponent for th..
Consider the gas carburizing of a gear of 1020 steel at 927oC. Calculate the carbon content at 0.5mm beneath the surface of the gear at 5hr carburizing time. Assume the carbon content at the surface is 0.90% and that the steel has a nominal carbon co..
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