A ceramic metal matrix composite and copper material having a layer of ceramic metal matrix composite such as aluminum silicon carbide bonded to a layer of metal such as copper useful for forming heat-dissipating components for microelectronics concerned with lightweight, high stiffness, high thermal conductivity and compatible thermo expansion characteristics. The social graph includes user nodes that are each associated with a particular user of the social-networking system. On such detection, the objective function is analysed to determine adaptive constraint values for the one or more constraints for optimally solving the objective function. Fluid flowing through the flow tube is caused by thermal siphoning effects.