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The impacts of numbers of gate fingers on large signal of High Electron Mobility Transistor (HEMT) were studied in this paper. The analysis was carried out measurement using Maury Automated Tuner System (ATS) at frequency of 2.4 GHz and 5.8 GHz. The measurement results shows that the transistor that has higher number of gate fingers is less preferred for high P1dB compression and Power Added Efficiency...
World-wide, underwater background noise levels are increasing due to anthropogenic activities. Little is known about the effects of anthropogenic noise on marine fish, and information is needed to predict any negative effects. Behavioural startle response thresholds were determined for eight marine fish species, held in a large tank, to tones of 0.1–64kHz. Response threshold levels varied per frequency...
World-wide many cetaceans drown incidentally in fishing nets. To reduce the unwanted bycatch in gillnets, pingers (acoustic alarms) have been developed that are attached to the nets. In the European Union, pingers will be made compulsory in some areas in 2005 and in others in 2007. However, pingers may effect non-target marine fauna such as fish. Therefore in this study, the effects of seven commercially-available...
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