Abstract: A system to apply uniform layers of metal powder, the system includes: a conductive roller with a dielectric coating, the conductive roller biased at a first voltage; a powder supply to contain a metal powder biased at a second voltage, the powder supply to provide the metal powder to the conductive roller to form a uniform layer of metal powder on the dielectric coating of the conductive roller; a deposition area to receive the uniform layer of metal powder from the conductive roller, the deposition area biased at a third voltage, wherein the metal powder is transferred across an air gap from the conductive roller to the deposition area by electrostatic attraction of the metal powder.

Abstract: A system to apply uniform layers of metal powder, the system includes: a conductive roller with a dielectric coating, the conductive roller biased at a first voltage; a powder supply to contain a metal powder biased at a second voltage, the powder supply to provide the metal powder to the conductive roller to form a uniform layer of metal powder on the dielectric coating of the conductive roller; a deposition area to receive the uniform layer of metal powder from the conductive roller, the deposition area biased at a third voltage, wherein the metal powder is transferred across an air gap from the conductive roller to the deposition area by electrostatic attraction of the metal powder.

Abstract: A method and apparatus for monitoring the behavior over time of a distributed system. Time-stamped data descriptive of events at one subsystem are placed into a local buffer. The subsystem is notified of the time when a trap condition occurs at another subsystem. Data having a time-stamp within a certain interval of the occurrence of the trap condition are archived to provide a history of the system for later analysis. Time is determined by a local clock in each subsystem. These clocks are synchronized to ensure accurate correlation between events at different subsystems. Trap conditions are categorized and data descriptive of subsystem states are classified to facilitate selective notification of one or more other subsystems, and selective retention of the data, depending on which category of trap condition has occurred and which class of data has been collected.