A post-processing technique to remove background noise from echo integration data

first_imgEcho integration of biological organisms with a low target strength can be difficult because of the problem of setting suitable pre-integration thresholds, and this is particularly acute with higher frequencies, such as 120 or 200 kHz, which are often used in studies of euphausiids. One solution is to integrate data without any threshold and then remove background noise during post-processing. Unthresholded, integrated data of micronekton and Euphausia superba collected with a SIMRAD EK500 at frequencies of 38 and 120 kHz are presented. The underlying background noise level follows a 20 log R+2αR relationship, which can be scaled to the minimum volume backscatter (Sv) in each layer during a transect and then subtracted from the entire data set to remove background noise. The utility of this procedure is demonstrated by making comparisons of Sv at each frequency and investigating the effect of noise removal on the identification of targets based on the dB difference (120 kHz Sv–38 kHz Sv).last_img read more

Fire-ravaged Speedibake factory unlikely to reopen

first_imgSpeedibake does not plan to rebuild its site in Wakefield that was devastated by fire four weeks ago.The blaze completely destroyed two buildings and caused structural damage to others.Speedibake stated: “With great regret, we consider that the financial cost and time needed to undertake a full rebuild is simply too great to make it a viable option.”Around 160 staff will be affected by the planned closure. The company said it had explored a number of options to keep the site open, and would still consider alternative proposals.In a trading update this week, Speedibake parent company Associated British Foods (ABF) referred to the “significant damage” at Wakefield, and stated it has comprehensive insurance for property damage and business interruption.Following the fire on 1 February, Speedibake pledged to pay staff for at least three months while damage was assessed.Today (27 February) it said: “We have been mindful that we need to give people clarity as quickly as possible so that they can plan for the future.“We know this announcement will be deeply upsetting for many people and we give our absolute commitment that, if the proposals are accepted, we will support those affected to help them find alternative employment.”Some roles will be offered in the Bradford Speedibake site, following the transfer of a Wakefield production line there. Speedibake said it would also be speaking to other businesses owned by ABF about potential job openings.“In the meantime, we will continue to work with our employees through this period of consultation and have expressed to them our deep gratitude and pride in the manner they responded to the fire and its aftermath,” said Speedibake.“We are also thankful for the support we continue to receive from the community, our suppliers and customers.”last_img read more

Metallica Members Play National Anthem Ahead Of Golden State Warriors NBA Finals Game [Watch]

first_imgWednesday night’s NBA Finals game between the Golden State Warriors and the Toronto Raptors at Oakland, CA’s Oracle Arena featured a pre-game performance of the National Anthem by Metallica‘s James Hetfield and Kirk Hammett. As the Oracle Arena announcer stated while introducing the two local musical heroes, “From day one, this band has called the Golden State its home.”The pair took to the hardwood for a rocking instrumental rendition of “The Star-Spangled Banner” similar to the various versions they’ve delivered at nearby Oracle Park ahead of the San Francisco Giants‘ annual “Metallica Night.” Much like their recent “Metallica Night” National Anthem, Hetfield and Hammett’s performance ahead of the Warriors game saw them rock the team’s logos and slogans on their clothing and gear.Watch Metallica’s James Hetfield and Kirk Hammett play “The Star-Spangled Banner” ahead of the Warriors game at Oracle Arena below:James Hetfield, Kirk Hammett (Metallica) – “The Star-Spangled Banner” – Oracle Arena[Video: SPORTSNET]Metallica isn’t the only Bay Area musical act that has publicly supported the Warriors of late. At a recent Warriors playoff game, the Grateful Dead‘s Bob Weir and fellow Bay Area native Jackie Greene delivered an a cappella rendition of the Anthem. Weir has also been spotted in the crowd on various occasions rooting on the Golden State squad, often alongside NBA Hall of Fame-er and noted Deadhead Bill Walton.While the Warriors wound up losing the game to the Raptors (bringing the score of the best-of-seven series to 2-1 with Toronto in the lead), they’ll have a chance to even the score when Game 4 takes place at Oracle Arena on Friday night.last_img read more