1,721,857 research outputs found
Reliability Case Notes No. 5: Report on water leak in Autosub6000 charge blanking plug. Burton blank No 82530-12-5502-3212-0000 NR
No full textThe blanking plug, Burton Part No 82530-12-5502-3212-0000 NR, which blocks off the charge lead on Autoub6000 leaked water during two missions on the JC027 cruise. An investigation showed fibres had become trapped inside the connector which would have caused a leak. Measurement of the plug and connector shows the secondary seal around the pins and sockets to be marginal. Care to avoid debris being trapped and better tools to aid tightening the connector will avoid a repeat of the problem
Report on Air Launched Autonomous Underwater Vehicles
Full text linkThe feasibility of Autonomous Underwater Vehicles (AUVs) being launched from aircraftwas funded through the NERC Oceans 2025 programme, investigating a more economicalof seeding wide swaths of ocean with sensors carrying out wide scale, synoptic physicaloceanographic surveys. Small AUVs would be parachuted down, upon hitting the water,they would begin their AUV missions.As well as applications for wide spatial surveys, opportunities were seen forsupplementing existing surveys such as the Atlantic Meridional Transect (AMT),Porcupine Abyssal Plain (PAP), Meridional Overturning Circulation (MOC). The fasterresponse time of mobilising an aircraft compared with a ship opens possibilities for rapidresponse surveys, e.g. pollution spills, and algal blooms. A unique application particularlywell suited to Air Launched AUVs (ALAUVs) is the survey of polynyas in the PolarRegions which are uncharted and important to setting the conditions for circulationbeneath the ice shelves. Beyond environmental research and civil survey work, theconcept also has naval applications for sound velocity profiles, bio luminescence, and withthe ALAUV being much smaller and semi disposable compared with existing vehicles,covert surveys.Key to the overall success is creating an economical AUV that could be considered to besemi disposable by means of small overall size, simple design with minimalist the subsystems. With the developments of miniaturisation and lower power requirements ofsubsystems and to a lesser extent, battery technologies, there exists an opportunity fordeveloping an AUV weighing in the region of 2.5kg but which still has a range of some350km at 0.5ms-1. A number of small sensors in the market place used for tagging fish andmammals and the research work at the National Oceanography Centre (NOC) onminiaturised sensors all help support the case for further development.The conclusion is the ALAUV concept is feasible, opens new applications and new modusoperandi of working with AUVs
Fotografía UDBC015094
No full textFotografía del ejemplar Stevenson, P. 1348, determinado como Uncaria guianensi
Fotografía UDBC013099
No full textFotografía del ejemplar Stevenson, P. 1232, determinado como Ischnosiphon aroum
Fotografía UDBC012665
No full textFotografía del ejemplar Stevenson, P. 311, determinado como Paullinia serjaniifoli
Fotografía UDBC013080
No full textFotografía del ejemplar Stevenson, P. 1146, determinado como Renealmia monosperm
Fotografía UDBC013079
No full textFotografía del ejemplar Stevenson, P. 1153, determinado como Mansoa sp
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