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Discoveries of integumentary coverings on non-avian theropod dinosaurs are becoming commonplace. But the only definitive evidence so far that any of these animals had feathers as we know them today has come from the oviraptorosaur Caudipteryx and the enigmatic coleurosaur Protarchaeopteryx, both of which are considered by some to be secondarily flightless(More)
This paper presents an intelligent test system for power amplifiers by using virtual instrument technology. The automatic range switching circuit and Hall current transducers are applied in this system, realizing effectively the measurement of wide-voltage signal and large current. LabVIEW, a graphical programming language, and expert system technology are(More)