Suppose that a wing component on an aircraft is fabricated Suppose that a wing component on an aircraft is fabricated from an aluminum alloy that has a plane strain fracture toughness of 40MPavm (36.4ksivin). It has been determined that fracture results at a stress of 365MPa (53,000psi) when the maximum internal crack length is 2.5 […]
For each of the following pairs of semiconductors, decide which For each of the following pairs of semiconductors, decide which will have the smaller band gap energy, Eg, and then cite the reason for your choice. (a) ZnS and CdSe, (b) Si and C (diamond), (c) Al2O3 and ZnTe, (d) InSb and ZnSe, and (e) […]
Sometimes cos ( cos ( in Equation 7.2 is termed Sometimes cos ( cos ( in Equation 7.2 is termed the Schmid factor. Determine the magnitude of the Schmid factor for an FCC single crystal oriented with its [100] direction parallel to the loadingaxis.
Steady-state creep rate data are given below for nickel at Steady-state creep rate data are given below for nickel at 1000(C (1273 K): If it is known that the activation energy for creep is 272,000 J/mol, compute the steady-state creep rate at a temperature of 850(C (1123 K) and a stress level of 25MPa(3625psi).
A PAM telemetry system involves the multiplexing of four input A PAM telemetry system involves the multiplexing of four input signals: si (t), i = 1, 2 3, 4. Two of the signals s1 (t) and s2 (t) have bandwidths of 80 Hz each, whereas the remaining two signals s3 (t) and s4 (t) have […]
Some of our modern kitchen cookware is made of ceramic Some of our modern kitchen cookware is made of ceramic materials. (a) List at least three important characteristics required of a material to be used for this application. (b) Make a comparison of three ceramic materials as to their relative properties and, in addition, to […]
Some metal alloy is known to have electrical conductivity and Some metal alloy is known to have electrical conductivity and electron mobility values of 1.5 x 107 (ohm-m)-1 and 0.0020 m2/V-s, respectively. Through a specimen of this alloy that is 35 mm thick is passed a current of 45 A. What magnetic field would need […]
A radio link uses a pair of 2m dish antennas A radio link uses a pair of 2m dish antennas with an efficiency of 60 percent each, as transmitting and receiving antennas. Other specifications of the link are: Transmitted power = 1dBw Carrier frequency = 4 GHz Distance of the receiver from the transmitter = […]
Consider a rectangular pulse defined by, it is proposed to Consider a rectangular pulse defined by, it is proposed to approximate the marched filter for g (t) by an ideal low-pass filter of bandwidth B; maximization of the peak pulse signal-to-noise ratio is the primary objective. (a) Determine the optimum value of B for which […]
Consider a random process X (t) expanded in the form N, where Consider a random process X (t) expanded in the form N, where W’ (t) is a remainder noise ter Consider a rate-1/2, constraint length-7 convolutional code with free distance d free = 10. Calculate the asymptotic coding gain for the following two channels […]