Achip measuring 5 mm 5 mm is placed flush on a flat plate 18 cm from the leading edge. the chip is cooled by air at 17oc flowing with a velocity of 56 m/s. determine the maximum power that can be dissipated in the chip if its surface temperature is not to exceed 63oc. assume no heat loss from the back side of the chip.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

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