Consider a windshield of length L = 800 mm and thickness t = 6 mm and driving conditions for which the vehicle moves at a velocity of V = 70 mph in ambient air at T[infinity], o = −15°C. From laboratory experiments performed on a model of the vehicle, the average convection coefficient on the outer surface of the windshield is known to be correlated by an expression of the form ¯¯¯¯¯ Nu L = 0.030 Re 0.8 L Pr 1 / 3 Nu¯L=0.030 ReL0.8Pr1/3 , where ReL ≡ VL/v. Air properties may be approximated as k = 0.023 W/m ⋅ K, v = 12.5 × 10−6 m2/s, and Pr = 0.71. If Tdp = 10°C and T[infinity], i = 50°C, what is the smallest value of ¯ h i h¯i required to prevent condensation on the inner surface?

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia