Heat conduction consider heat conduction through the walls of a pipe when the inside wall temperature is 200 °c, the outside wall temperature is 80 °c and the thickness of the wall is 0.05 meters. the inside radius is 0.05 meter (ro), and the outside radius is 0.1 m. the differential equation which describes the temperature distribution is: dt+r(er) the finite difference representation of this diferen eqaio generates a set of equations of the dx2 following form: 2r +br)t+1 tt + (-2 )ti-1-0, for i= 2,3, 10 where r = ro + δr(i-1 )-0.05 + 0.005(-1), and t,-200 ℃ t11-80 °c solve for the temperature distribution using the lu decomposition method. compare your answer with any matlab built-in function. plot your results.

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this

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