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The method is particularly efficient and accurate for microstructures with a diffuse interface description such as those generated from phase-field simulations . The first pertains to investigating the potential biological effects of exposure of cell cultures and / or animals to both ionizing radiation and electromagnetic fields , such as those generated by mobile phones and power lines . A regular language is one that can be described by a regular grammar or regular expression or accepted by a DFA-based lexer such as those generated by lex . ISO / IEC 14772 does not distinguish between discrete events ( such as those generated by a TouchSensor ) and events that are the result of sampling a conceptually continuous set of changes ( such as the fraction events generated by a TimeSensor ) . Allocation of self generated fees must be communicated to the general membership . Cluster analysis might improve class or strategy design , since it generates clusters from the bottom-up , by mapping differences of individual game assets . Piezoelectric accelerometers are called active devices because they generate their own signals and theoretically do not need to be powered . BIOPIX stores images , such as those generated at the CCD camera-based imaging station , as separate files , and records the attributes of each in a database . Combining live-action footage with computer generated models is tedious , time consuming work that contributes significantly to animation costs .