43 research outputs found
Flying challenges for the future: Aviation preparedness â in the face of cyber-terrorism
Transport has always been, and will continue to be, a means to serve to eradicate world inequalities bringing relief and salvation across the globe and no transport mode more so perhaps than aviation. However, aviation has served as both the salvation and the aggressor, having also itself been the victim of terrorist attacks. Arguably (to date) in 2016, the world could consider itself fortunate not to have witnessed a devastating cyber-terrorist attack on an aircraft. Certainly concerns were raised after the disappearance of MH370 in terms of cockpit tampering; and yet, these reports only touched upon the surface of an effervescing iceberg â set to erupt into a tsunami of devastation. The question inevitably remains âwhenâ rather than âifâ this will occur. This research reviews the vulnerability of air travel and the preparedness of the industry in terms of coordination (prevention and protection) from the perspective of policy, legislation (regulation) and organisation
Observation of Two New Excited Îb0 States Decaying to Îb0 K-Ï+
Two narrow resonant states are observed in the Îb0K-Ï+ mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb-1. The minimal quark content of the Îb0K-Ï+ system indicates that these are excited Îb0 baryons. The masses of the Îb(6327)0 and Îb(6333)0 states are m[Îb(6327)0]=6327.28-0.21+0.23±0.12±0.24 and m[Îb(6333)0]=6332.69-0.18+0.17±0.03±0.22 MeV, respectively, with a mass splitting of Îm=5.41-0.27+0.26±0.12 MeV, where the uncertainties are statistical, systematic, and due to the Îb0 mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of Î[Îb(6327)0]<2.20(2.56) and Î[Îb(6333)0]<1.60(1.92) MeV at a 90% (95%) credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths, and resonant structure of the new states are in good agreement with the expectations for a doublet of 1D Îb0 resonances
Electronic structure of indium-tin-oxide films fabricated by reactive electron-beam deposition
Characterisation of interfacial bonding and photochemistry in self-assembled thiol monolayers on gold using NEXAFS and ARUPS.
Characterising the acoustic emission from a simulated gear contact in mixed lubrication conditions
Acoustic Emission (AE) measurement has been long established as a sensitive tool for detecting damage and failure in engineering structures, where sensors are used to detect the elastic stress waves originating from crack growth, impact damage, plastic deformation and other failure mechanisms. This paper examines the sensitivity of AE to mixed lubrication conditions, in order to evaluate the technique for monitoring heavily loaded power transmission gear systems where roughness scale fatigue phenomena such as micro-pitting are a problem. Experiments were conducted using a power-recirculating twin disc rig designed to investigate elastohydrodynamic contacts. Speed and temperature were varied in order to instigate a range of lubrication conditions from full film to heavily mixed lubrication. The AE was found to be precisely dependent on the level of asperity contact and a general relationship between AE and the specific film thickness was determined for these results
Maternal Exposure to Secondhand Cigarette Smoke Primes the Lung for Induction of Phosphodiesterase-4D5 Isozyme and Exacerbated Th2 Responses: Rolipram Attenuates the Airway Hyperreactivity and Muscarinic Receptor Expression but Not Lung Inflammation and Atopy
Diversidade e métodos de amostragem de Hymenoptera na cultura da melancia no semiårido
Resumo: Os objetivos deste trabalho foram conhecer a fauna de Hymenoptera associada Ă cultura da melancia e avaliar a influĂȘncia das armadilhas Pitfall, Moericke e McPhail na captura desses insetos, em ambiente semiĂĄrido no estado do Rio Grande do Norte. O levantamento foi realizado entre os meses de agosto e setembro de 2011, em ĂĄrea de produção comercial de melancia cv. Crimson Sweet. As coletas dos himenĂłpteros foram realizadas, semanalmente, durante o ciclo da cultura. Para captura dos insetos, foram utilizados trĂȘs tipos de armadilhas, Pitfall, Moericke e McPhail, na densidade de 20, 20 e 1 armadilha por hectare, respectivamente. As armadilhas foram instaladas sete dias apĂłs o plantio das sementes, e mantidas na ĂĄrea atĂ© a colheita dos frutos. Foram coletados um total de 3.123 himenĂłpteros pertencentes a 10 superfamĂlias, distribuĂdas em 24 famĂlias. Formicidae foi a mais representativa, com abundĂąncia relativa total de 54,43%, seguida por Apidae com 17,96%. Foi observada tambĂ©m a presença de 18 famĂlias de himenĂłpteros parasitoides (18,89%), com destaque para Platygastridae (6,60%), Encyrtidae (2,79%), Chalcididae (2,56%), Mymaridae (2,56%), Pompilidae (1,15%) e Trichogrammatidae (1,09%). Ressalta-se ainda a ocorrĂȘncia das famĂlias de predadores Crabronidae (6,34%), Vespidae (2,24%) e Sphecidae (0,10%). Dentre as armadilhas, Moericke capturou a maior diversidade de Hymenoptera (24 famĂlias), seguida por Pitfall (11 famĂlias) e McPhail (sete famĂlias)