Abstract: The present invention provides a method and system for generating a distinct signature of electronic components that is compared to a known signature for identification and verification of the electronic component. The component signature is displayed on an alpha-numeric display for viewing by the user, or can be used as a pointer in a look-up table for displaying a string of text corresponding to the signature. In a digital generation method, a test sequence is executed, wherein a predetermined combination of logic levels are applied to the pins of a component. The logic levels applied to each pin are then compared to their respective feed-back logic levels. The sum of all the differences between the feed-back logic levels and the applied logic levels at the end of the test sequence is used in generating a signature. In an analog generation method, values calculated as a function of the waveform response of the component are used to generate a signature for the component.

Abstract: The instant invention relates to a process for removing trace sulfuric acid rom nitrocellulose fibers by dispersing the fibers in water and then subjecting them to ultrasonic energy for a time period and at an energy level sufficient to enhance the nitrocellulose fibers contact with water and facilitate sulfuric acid dispersal in the water. The waste water containing the traces of sulfuric acid contaminant from the nitrocellulose fibers is removed and the purified nitrocellulose fibers recovered.

Abstract: There is disclosed a process for the nitration of cellulose with nitric acid in the absence of sulfuric acid which comprises adding sufficient nitric oxide and oxygen or air to the nitration reaction mixture to react with the water formed in the reaction. This regenerates nitric acid which can be recycled to the reaction or removed and collected.

Abstract: A continuous process is provided for the vapor phase nitration of cellulose n a novel reactor having a gas tight housing containing a table with a perforated surface. Cellulose in porous sheet form is continuously passed into the reactor over the perforated table while continuously introducing nitric acid vapor into the housing through the perforations to provide a cushion of nitric acid gas supporting the sheet and forcing nitric acid vapor through the porous sheet. Water vapor formed in the reaction and unreacted nitric acid vapor are continuously removed from the housing, together with the nitrocellulose sheet produced. The rate at which the cellulose sheet is passed through the reactor depends on the rate at which the nitric acid is introduced and the degree of nitration desired. The cellulose can be partially nitrated by the novel process and further nitrated with nitric acid in liquid phase. The process produces a uniform nitrocellulose product suitable for use in propellants.