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This paper provides a comprehensive introduction of an emerging Near-Field (NF) antenna measurement technique using airborne NF-probes installed on Unmanned Aerial Vehicles (UAVs). It sums up the highlights of an ADVANCED Near-Field Antenna Measurement Technology which benefits most the UAV-based measurement approach. An example for the mission requirements will be given with special regard to the...
Antenna measurement facilities face their physical limits with the growing size of today's large and narrow packed antenna farms of telecom satellites but also of large unfurlable reflector antennas for low frequency telecom applications. The special operational constraints that come along when measuring such large future antennas demand for new measurement approaches, especially if the availability...
Future telecommunication satellites are built with increasing antenna sizes and possess high demands on antenna measurement facilities. AIRBUS Defence & Space Compensated Compact Ranges (CCRs) are highly accurate facilities for antenna and payload testing. However, facilities of type CCR 75/60 have a quiet zone size of approximately 5 m diameter which can become critical for future satellite applications...
To compare the image quality and radiation dose between iterative reconstruction (IR) and standard filtered back projection (FBP) in CT of the chest and abdomen.Thoracic CT was performed in 50 patients (38 male, 12 female; mean age, 51±23yrs; range, 7–85yrs) and abdominal CT was performed in 50 patients (36 male, 14 female; mean age, 62±13yrs; range, 20–85yrs), using IR as well as FBP for image reconstruction...
Using a novel cyanelle isolation procedure we showed that pre-ferredoxin-NADP + -oxidoreductase (pre-FNR) from C. paradoxa is translocated in vitro across the peptidoglycan-containing cyanelle envelope. Efficient import was also observed in a heterologous system with pea chloroplasts as the recipient organelles. These results support the conclusion derived from comparative analysis of plastid...
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