Conformal phased array with beam forming for airborne satellite communication

For enhanced communication on board of aircraft novel antenna systems with broadband satellite-based capabilities are required. The installation of such systems on board of aircraft requires the development of a very low-profile aircraft antenna, which can point to satellites anywhere in the upper hemisphere. To this end, phased array antennas which are conformal to the aircraft fuselage are attractive. In this paper two key aspects of conformal phased array antenna arrays are addressed: the development of a broadband Ku-band antenna and the beam synthesis for conformal array antennas. The antenna elements of the conformal array are stacked patch antennas with dual linear polarization which have sufficient bandwidth. For beam forming synthesis a method based on a truncated Singular Value Decomposition is proposed

Internal report cluster 1: Urban freight innovations and solutions for sustainable deliveries (4/4)

Technical report about sustainable urban freight solutions, part 4 of

Halverwege

Ergens tussen tien uur 's avonds en zeven uur 's ochtends, in de nacht van 7 op 8 mei jongstleden, werd de B.I.L. bezocht door onbekende, onverwachte en zeker ongenode gasten. Met gebruik van breekijzer en ander semiprofessioneel gereedschap wist het dievengilde enkele lades open te breken. Toen men niets aantrof werd de arbeid elders voortgezet. Een zustervereniging werd bestolen van het astronomische bedrag van f 4,-. Met deze mededeling is trouwens dit artikel officieel aangebroken

The efficacy of anti-inflammatory medication in postoperative cognitive decline: A meta-analysis

Objective: Post-operative cognitive decline is a surgical complication involving chronic impairments in different cognitive domains. Although the exact mechanisms behind postoperative cognitive decline are still unknown, there is increasing evidence for a key role of neuroinflammation. This meta-analysis aims to investigate the efficacy of anti-inflammatory treatment on postoperative cognitive decline. Participants and Methods: An electronic search was performed using PubMed, Psychinfo, EmBase, Cochrane Database of Systematic Reviews and clinicaltrial.gov (until November 2019). No year or language restrictions were applied. Only randomized, double-blind, placebocontrolled studies that investigated clinical outcome in adult patients who underwent surgery under general anaesthesia (except brain surgery) were included. The search yielded 574 papers, of which nineteen fulfilled the inclusion criteria. Results: The current meta-analysis found a significant effect of different anti-inflammatory agents on the incidence of POCD (OR=0.67, p=0.010). Administration of COX-2 inhibitors (OR=0.31, p<0.0001), ketamine (OR=0.44, p=0.38) and lidocaine (OR=0.79, p=0.33) showed better results than placebo in a meta-analysis of at least two studies. Erythromycin (OR=0.14, p=0.006), erythropoietin (OR=0.15, p=0.07) and dexmedetomidine (OR=0.58, p=0.03) were significant in single studies. No beneficial effects on cognition were found for magnesium, 17βestradiol, dexamethasone and melatonin. Conclusion: The results of this meta-analysis provide evidence for a potential efficacy of anti-inflammatory agents on POCD, but further research is necessary to determine which agents are most appropriate for clinical application