Abstract: Method for determining chemical constituents in an electrolysis cell for the production of metal, in particular aluminum, involving the use of light spectroscopy such as Raman spectroscopy that analyses the light emitted from the cell constituents and represents the light as a spectrum, wherein the analysis is performed directly in the cell while the cell is in its production mode, whereby the spectrum is analysed on the basis of reference spectrums based on known compositions, to determine chemical constituents in the cell. Also provided is an apparatus for performing this method.

Abstract: Methods of speeding error analysis of electronic devices under test using simulation software that has the capability of simultaneously executing up to 32 tests on one image of the design model. One embodiment of the method contemplates executing the tests staggered in time so that a larger portion of the test is available for examination and execution at any given time. This allows errors to be found more quickly. Another embodiment contemplates more quickly testing a device initialization sequence by randomly establishing values for each state device, separately for each of the 32 tests, running the simulation, and then determining whether the state device values converge.