Flight Acoustic Testing and For the Rotorcraft Noise Data Acquisition Model (RNM)

Two acoustic flight tests have been conducted on a remote test range at Eglin Air Force Base in the panhandle of Florida. The first was the "Acoustics Week" flight test conducted in September 2003. The second was the NASA Heavy Lift Rotorcraft Acoustics Flight Test conducted in October-November 2005. Benchmark acoustic databases were obtained for a number of rotorcraft and limited fixed wing vehicles for a variety of flight conditions. The databases are important for validation of acoustic prediction programs such as the Rotorcraft Noise Model (RNM), as well as for the development of low noise flight procedures and for environmental impact assessments. An overview of RNM capabilities and a detailed description of the RNM/ART (Acoustic Repropagation Technique) process are presented. The RNM/ART process is demonstrated using measured acoustic data for the MD600N. The RNM predictions for a level flyover speed sweep show the highest SEL noise levels on the flight track centerline occurred at the slowest vehicle speeds. At these slower speeds, broadband noise content is elevated compared to noise levels obtained at the higher speeds. A descent angle sweep shows that, in general, ground noise levels increased with increasing descent rates. Vehicle orientation in addition to vehicle position was found to significantly affect the RNM/ART creation of source noise semi-spheres for vehicles with highly directional noise characteristics and only mildly affect those with weak acoustic directionality. Based on these findings, modifications are proposed for RNM/ART to more accurately define vehicle and rotor orientation

Nonminimal black holes with regular electric field

We discuss the problem of identification of coupling constants, which describe interactions between photons and space-time curvature, using exact regular solutions to the extended equations of the nonminimal Einstein-Maxwell theory. We argue the idea that three nonminimal coupling constants in this theory can be reduced to the single guiding parameter, which plays the role of nonminimal radius. We base our consideration on two examples of exact solutions obtained earlier in our works: the first of them describes a nonminimal spherically symmetric object (star or black hole) with regular radial electric field; the second example represents a nonminimal Dirac-type object (monopole or black hole) with regular metric. We demonstrate that one of the inflexion points of the regular metric function identifies a specific nonminimal radius, thus marking the domain of dominance of nonminimal interactions.Comment: 10 pages, 2 figures; based on talks presented at VII Black Holes Workshop, Aveiro, Portuga

Mobilization of Pollutant-Degrading Bacteria by Eukaryotic Zoospores

This study was supported by the Spanish Ministry of Science and Innovation (CGL2010-22068-C02-01 and CGL2013- 44554-R), the Andalusian Government (RNM 2337), and the CSIC JAE Program (RS). PvW has funding support from the BBSRC and NERC. Thanks are also given to Sara Hosseini of the Uppsala BioCenter, SLU, Uppsala, Sweden for a useful discussion on oomycete zoospores.Peer reviewedPostprin

TRENDS IN MIGRATION TO IRELAND OF NATIONALS OF COUNTRIES WITH VISA LIBERALISATION AGREEMENTS WITH THE EUROPEAN UNION. ESRI SURVEY AND STATISTICAL REPORT SERIES, August 2019

The synthesis report presents an analysis of the impact in terms of direct and indirect benefits, as well as challenges. Tourism is considered a direct benefit, as tourism is one of the purposes of a short-stay visa. There was a rise in tourists from the visa-free countries after visa liberalisation across the EU Member States, although the numbers were modest in the context of overall tourism numbers to the EU. Residence permits for work or study reasons were considered an indirect benefit – as these are not purposes of stay for a short-stay Schengen visa, though a short stay could ultimately influence a longer stay for one of these reasons. The synthesised findings show that the number of residence permits issued to nationals of the visa-free countries more than doubled since 2008, and most of these were issued for employment reasons. Therefore, the report suggests that visa liberalisation could be a facilitator to labour market access. However, a similar link was not found for student migration or for entrepreneurship (EMN, 2019)