MATERIALS SCIENCE & ENGINEERING:AN INTRO
10th Edition
ISBN: 9798203933584
Author: Callister
Publisher: ZYBOOKS
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3-1) Similar to Lathi & Ding prob. 3.1-1. Use direct integration to find the Fourier transforms of the
signals shown below.
a) g₁(t) = II(t − 2) + 2 exp (−3|t|)
b) g(t) = d(t+2)+3e¯u (t − 2)
3-2)
Lathi & Ding prob. 3.1-5. From the definition in eq. 3.1b, find the inverse Fourier transforms of the
spectra in the figure below.
G(f)
COS лf
10
(a)
G(f) 1
-B
B
(b)
Fundamentals of Energy Systems HW 4 Q2
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- Compare the security services provided by a digital signature (DS) with those of a message authentication code (MAC). Assume that Oscar can observe all messages sent between Rina and Naseem. Oscar has no knowledge of any keys but the public one, in the case of DS. State whether DS and MAC protect against each attack and, if they do, how. The value auth(x) is computed with a DS or a MAC algorithm. In each scenario, assume the message M = x#####auth(x). (Message integrity) Rina has the textual data x = “Transfer $1000 to Mark” to send to Naseem. To ensure the integrity of the data, Rina generates auth(x), forms a message M, and then sends M in cleartext to Naseem. Oscar intercepts the message and replaces “Mark” with “Oscar.” Will Naseem detect this in the case of either DS or MAC? If yes, how will Naseem detect it? If not, why? (Replay) Rina has the textual data x = “Transfer $1000 to Mark” to send to Naseem. To ensure the integrity of the data, Rina generates auth(x), forms a message…arrow_forwardFundamentals of Energy Systems HW 4 Q1arrow_forwardFundamentals of Energy Systems HW 4 Q4arrow_forward
- Fundamentals of Energy Systems HW 4 Q6arrow_forward4.5arrow_forwardConstruct a battery pack to deliver 360V and 450-mile range for a vehicle that consumes 200 Wh/mile, from prismatic cells with 25Ah and 3.6 V. Physical dimensions of the cell are 0.5 cm thickness, 20 cm width and 40 cm length. a) Report configuration of the battery pack. 10-points b) Resistance of each cell is 0.05 Ohm, calculate the total internal resistance of the battery pack. 10-points c) Calculate the voltage drop during discharge when the battery is discharged at 100A. 10-points d) Calculate the amount of anode and cathode to build a prismatic cell with 25Ah capacity. Assume the cell chemistry as: Si anode and [Li(Ni1/3Co1/3Mn1/3)O2] cathode. Atomic weight of elements: Li=7, Si = 28, Ni=58, Co=59, Mn=55, O=16, 10-points e) Calculate the theoretical specific energy (Wh/kg) and practical energy density (Wh/liter) of the battery pack. 10-points f) Calculate the thickness on anode and cathode coating assuming each electrode has 30%…arrow_forward
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