Power Systems
The value of off diagonal elements is

 sum of admittances connected at bus j
 sum of admittances connected at bus i
 which is connected between bus i and bus j with negative sign
 which is connected between bus i and bus j with positive sign

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Power Systems
A CANDU reactor uses

 only fertile materials.
 highly enriched uranium as fuel and water as moderator and coolant.
  natural uranium as fuel and heavy water as moderator and coolant.
 enriched uranium as fuel and ordinary water as moderator and cooler.

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