The present invention provides a cerium oxide particulate composition and a process for preparing a cerium oxide particulate composition comprising aggregates of approximately spherical primary particles of cerium oxide. In one example, a thermoplastic may be added to produce a trans-esterified HPLthermoplastic blend. Conductors transfer the electrical energy from the Peltier device to a boost circuit which converts a level of a voltage associated with the electrical energy output from the Peltier device to a higher, more useful value. A state of a level sensor in a print head reservoir is detected. Execution of the untrusted code in the virtual machine is interrupted in response to a value indicated by one or more of the periodic updates. Two or more temperature measurement elements are positioned within the thermally conductive heat spreading device.