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Blue sharks use hot water swirls to dive into the depths of the sea and feed themselves

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An interesting discovery concerning the behavior of blue sharks was carried out by a research group from the Woods Hole Oceanographic Institution (WHOI) and the Applied Physics Lab of the University of Washington (UW). According to the researchers, these fish use marine vortices, whirling currents that can be generated underwater, to descend into the corpuscular areas of the sea faster, almost accelerating, in order to feed and capture more prey.

In this oceanic layer, according to the researchers, located between 200 and 1000 meters deep, there is the largest fish biomass of any other marine area. The researchers came to this conclusion using locators attached to the body of a dozen blue sharks off the northeastern coast of the United States. The nine-month monitoring showed the scientists that blue sharks used sea vortices with a particular ability to sling hundreds of feet below the surface.

Here they also spent more than an hour looking for food basically composed of small fish or squid and then returning to the surface to warmer waters. Once heated the own body, they returned to accomplish this movement projecting in depth. These movements occurred mostly during the day, as specified by Camrin Braun, UW ocean ecologist and lead author of the study.

It is a behavior similar to that of white sharks that, unlike the blue sharks, are warm-blooded animals.

White sharks use a combination of hot and cold water eddies to dash into twilight areas while blue sharks, cold-blooded animals, rely exclusively on hot water vortices, as Braun explains: “Blue sharks they cannot regulate their body temperature internally to stay warmer than seawater like white sharks do. We think this is why they show a clear preference for hot water vortices – it removes a thermal constraint for deep dives.”

Mark Romando

I am an amateur astronomer, computer science student and chess Fide Master. I originally joined The Chunk in mid-2019 as a volunteer contributor in the interest of writing about different scientific research that I felt would be interesting to a wide range of people. Since joining I have published numerous stories and intend to stay publishing for a long time to come.

4846 Charmaine Lane, Levelland Texas, 79336
806-598-6726
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Mark Romando
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New fabric allows you to control electronic devices through clothes

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A new garment fabric that “allows users to control electronic devices through clothing” was developed by a group of researchers at Purdue University.

The same researchers underline the importance of this study as it is the first time that an efficient technique is shown to create a self-feeding fabric that can contain sensors or even displays using simple embroideries without resorting to the expensive processes that are necessary today to insert electronics or sensors of any kind in clothes, as reported by Ramses Martinez, professor at Purdue and one of the authors of the study which appeared in Advanced Functional Materials.

The fabrics created by Purdue scientists can in fact be resistant to water, and therefore to rain, and can be antibacterial as well as breathable but at the same time they can collect energy from the user himself to feed the electronics embedded in the fabric.

The technology is based on the omniphobic triboelectric nanogenerators (RF-TENG) thanks to which it was possible to incorporate tiny electronic components into the garment.

“It’s like having a wearable remote control that also keeps odors, rain, stains and bacteria away from the user,” the researchers report.

Mark Romando

I am an amateur astronomer, computer science student and chess Fide Master. I originally joined The Chunk in mid-2019 as a volunteer contributor in the interest of writing about different scientific research that I felt would be interesting to a wide range of people. Since joining I have published numerous stories and intend to stay publishing for a long time to come.

4846 Charmaine Lane, Levelland Texas, 79336
806-598-6726
[email protected]
Mark Romando
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Mass of a huge supermassive black hole calculated with precision by astronomers

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What happens in a black hole? It is not yet known whether the theories are different. For the moment we have to settle for studying what happens in the “sphere of influence” of a black hole, ie the inner region closest to the “edge” of the black hole itself which is not part of the event horizon, that area beyond the which also the light can no longer leave.

A group of scholars is going to use this with the Aracama Large Millimeter / submillimeter Array (ALMA) to study this specific region of influence of the supermassive black hole located in the center of the galaxy NGC 3258. The latter is an elliptical galaxy that is located at a distance of about 100 million light-years from us.

The researchers determined the “weight” of the supermassive black hole: 2.25 billion solar masses. This is the most massive black hole measured with ALMA and one of the most massive but identified.

Researchers have shown that with this telescope it is possible to “map the rotation of gaseous discs around supermassive black holes with extraordinary details,” as reported by Benjamin Boizelle, a researcher at Texas A&M University as well as the principal author of the study published in the Astrophysical Journal.

Thanks to these “extraordinary details,” they calculated the weight of the black hole with a precision of better than 1%, a measurement that is considered as one of the most precise black hole mass measurements ever made for a black hole beyond outside the Milky Way.

The same data also shows that the speed of rotation of the disk around the black hole ranges from one million miles per hour in the outer edge, located at a distance of about 500 light-years from the black hole, up to three million miles per hour in the most central regions, at a distance of just 65 light-years from the black hole.

Mark Romando

I am an amateur astronomer, computer science student and chess Fide Master. I originally joined The Chunk in mid-2019 as a volunteer contributor in the interest of writing about different scientific research that I felt would be interesting to a wide range of people. Since joining I have published numerous stories and intend to stay publishing for a long time to come.

4846 Charmaine Lane, Levelland Texas, 79336
806-598-6726
[email protected]
Mark Romando
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Rising sea levels started in the 60s

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According to a study conducted by researchers from the University of Siegen, Germany, sea level rise would have started as early as the 60s of the last century. The study, published in Nature Climate Change, made use of various data relating to phenomena such as coastal tides and data from satellites.

In particular since the early 90s of the last century, satellites around the Earth have begun to measure the sea level with extreme precision, as reported by Sönke Dangendorf, researcher at the German University and principal author of the study, who adds: “So far it has not been clear when this acceleration began, in which region it was started and which processes contributed most to it. The answer to these questions was hampered by the fact that before the advent of satellite altimetry in 1992, our knowledge was based mainly on a few hundred tide gauges that record sea level along the coasts of the world and that our available approaches to reconstructing sea levels globally from these measurements were too inaccurate.”

The new approach, based on data relating to tidal registers and those provided by satellites, shows that the acceleration of sea-level rise began already in the 60s when the level itself began to increase by just under a millimeter per year (60 years), an acceleration that then reached more than 3 mm per year today, as reported by Carling Hay, geophysicist at Boston College and another author of the study.

The researchers also found that most of this level rise comes from the southern hemisphere, particularly from the subtropical southeastern marine areas of Australia and New Zealand. In these regions, this acceleration is even five times greater than the global average.

This differentiation, according to the same researchers, is due to the changing winds strongly influencing sea levels. They move northward from the warm masses of the ocean waters and control the absorption of heat by the underlying ocean, as Dangendorf explains: “When the westerly winds of the southern hemisphere intensify, more heat is pumped from the atmosphere into the ocean, leading to an expansion of the water column and therefore to an increase in the global sea level.”

Mark Romando

I am an amateur astronomer, computer science student and chess Fide Master. I originally joined The Chunk in mid-2019 as a volunteer contributor in the interest of writing about different scientific research that I felt would be interesting to a wide range of people. Since joining I have published numerous stories and intend to stay publishing for a long time to come.

4846 Charmaine Lane, Levelland Texas, 79336
806-598-6726
[email protected]
Mark Romando
Continue Reading

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