Methods, systems, and apparatus, including computer program products are provided for indexing tags in source code. Data assets associated with a plurality of source systems operating within the enterprise computing environment may be registered with an asset repository hub. For example, the multi-phase periodic signal generator circuit may include a control signal generator circuit that produces a control signal responsive to a voltage produced by the plurality of charge pump circuits, and an oscillator circuit that generates the plurality of phased periodic signals responsive to the control signal. 15 Hz and the high frequency components ranging from 0. The join key is written to the wireless field device with the handheld field maintenance tool. The synthetic quartz glass substrate has a high transmittance and a uniform transmittance distribution, and is adapted for use with excimer lasers, particularly ArF excimer lasers.