(a) Zirconium alloys are used a cladding (surrounding) material for nuclear fuels due to their near transparency to neutrons. Calculate the diffusion coefficient for hydrogen in high purity zirconium at 250 °C. (b) If it takes 1 year to diffuse a certain amount of oxygen into zirconium at 250 °C, how long will it take for the same amount of diffusion to occur at 500 °C? Some information: Qd = 11.4 kcal/mol Do = 1.09 cm2 /sec Zr and H both have the HCP structure. The diffusion mechanism is interstitial.

the answer is: they rebelled against saddam hussein’s rule.

kurds opposed saddam rule and wanted independence. kurds in the north and shiites in the south revolt against hussein.

for example, the halabja attack in 1988 conducted against the kurdish people by the iraqi regime under saddam hussein, where between 4000 people are killed and around 9000 are injured.

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.