electrical-fields

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If you put that ball on that machine while it wasn’t spinning, it would just roll straight down the lower sides. 

The raised edges would keep it in the middle line, but it’s only controlled in one direction. By spinning it, you constantly alternate the position of the tall sides, meaning that the ball is held in the middle, never able to fall off.

Particle accelerators control particles in the same way. Magnetic or electric fields can only direct particles in one plane at a time, so to keep a beam of particles rushing down a particle accelerator in one focused stream, the current gradient must constantly oscillate. This means the particles are constantly held in place, never able to shoot off in one direction.

Here’s the same principle in action: these are tiny pollen grains being held in place by an oscillating field. Rods in the four corners of the beam establish a field that oscillates many times a second to keep the pollen trapped. If it didn’t constantly switch, the pollen would all fly off in one direction.

Watch the full film with Dr Suzie Sheehy for more.

galemont  asked:

Hi there! I came across, your blog and I'm slowly gaining interest with it! Though, I'm still a bit of a skeptic regarding sharks (despite acknowledging their importance within the habitat); so if I may ask, how would you convince me why sharks are awesome?

There’s more than 400 known species of shark, and they come in all beautiful shapes and sizes! Here is just some of them:

Sharks have been around for over 400 million years. Some of the earliest sharks were discovered dating back to the Devonian age. Their shape, behavior, and survival skills have changed very little, this basically makes them swimming fossils. [x]

Sharks have special sensory organs called “Ampullae of Lorenzini”, these are the large jelly filled pores on their nose that can detect electrical fields in the water. Sharks are more sensitive to these fields than any other living animal, with a threshold of sensitivity as low as 5 nV/cm. That is 5/1,000,000,000 of a volt measured in a centimeter-long ampulla. [x]

A shark may grow and use over 20,000 teeth in its lifetime. Sharks never run out of teeth. Behind the first set in the front are many rows developing. As the next row moves forward a full set replaces the damaged, older set. [x]

In 2008, DNA evidence confirmed that a female Blacktip shark fertilized her own egg, impregnating herself without the help of a male. Though it’s not entirely known how rare this event, called parthenogenesis, is among Blacktip or other sharks. [x]

Unlike humans, shark eyes are equipped with a tapetum lucidum, a layer of mirrored crystals located behind the retina. This provides a means for light that initially escaped detection to be detected as it is passed through the retina a second time. [x]

Some female Bamboo sharks use sperm from multiple males to father a single litter. That makes her pups half-siblings, even though they’re born at the same time. This sperm can be stored inside the female for up to 4 years. [x]

Shark teeth are covered in fluoride, making them cavity-resistant. One 2012 study published in the Journal of Structural Biology found that sharks’ enamel is made up of a chemical called fluoroapatite, which is resistant to acid produced by bacteria. This, combined with the fact that most sharks replace their teeth throughout their lives, means that sharks have excellent dental health. [x]

Sharks do not have a single bone in their bodies. Their skeletons are made of cartilage. [x]

Bull sharks are one of the very few shark species that can survive in fresh water. Most sharks will absorb too much water and essentially explode, but the Bull shark is different. Its kidneys rapidly process the fresh water and get rid of it; their urine rate increases up to 15x, which means they are constantly flushing out the fresh water from their system. [x]

A shark’s skin is covered in special scales called denticles. These scales are shaped like sharp backwards pointing teeth, and are designed to smooth the flow of water over the shark’s body, reducing drag and increasing speed. In fact, these scales inspired human engineers to create “shark-skin suits” to help elite swimmers go fast as humanly possible. [x]

The Goblin shark extends its jaw way out in front of its body, then snaps it back to catch food. The jaw is suspended by ligaments, and not connected to the skull. [x] [gif]

Last but not least, consider this:

Sharks are part of every indigenous culture that lives near the sea. Humans have felt the power and presence of sharks since they have first laid eyes on the ocean. They have revered them as deities, gods, manifestations of ancestors and guardians for as long as cultures have existed.

{2016.11.05} ~~my first post

reviewing some topics for physics, big test coming up. ✨
electric fields are not my favourite topic, but i’m finding the motivation to keep up with them 😌✨

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“Welcome to the Kinetic Temple. Our energy source is the truth of imagination. As long as there is imagination in your hearts, we can recharge the world. Come on this journey with us through the Kinetic Temple.” - EDCLV Opening Ceremony

Fun Fact: The human body gives off an electromagnetic field.  No, seriously, all communication within the body and within the cell itself uses electricity. The field exists due to short-lived electrical events called action potentials which occur in several types of animal cells which are called “excitable” cells, a category of cell which includes neurons, muscle cells, and endocrine cells.

Bonus Fact: The human body also gives off light in the form of energy called biophotons. This energy is not heat energy; rather, the emission of biophotons is technically a type of bioluminescence such as certain sea creatures possess. Yes, we literally glow in the dark.

50 Shades…..of Science:

Desperate for release, the surface of the sun writhed as bundles of magnetic field lines from differing magnetic domains slipped and slid through the high Lundquist number plasma. The unconnected helical magnetic field heaved passionately, violently climaxing and expanding outwards… a much needed release of energy that had been pent up in the sun’s magnetic field over a period of days.

The ejected material – a rarefied flow of hot plasma consisting primarily of electrons and protons – formed a shock wave of Solar Energetic Particles traveling at 400 km/s, the coronal mass splashing across the Earth’s waiting atmosphere.

The magnetosphere, engorged by trapped plasma to a length of 200 Earth radii on the night-side, was disrupted by the wanton geomagnetic storm as the charged Solar Energetic Particles smashed longingly into atoms in the upper atmosphere’s auroral zones. Releasing power on the order of terawatt scale, the magnetosphere bloomed in a prurient, passionate display of color as magnetospheric electrons were forcibly accelerated downward by field-aligned electric fields, the leftover magnetospheric plasma messily dripping down along the Earth’s magnetic field lines.

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Anime: Dimension W

“In the year 2072, the world’s energy problems seem solved by a network of cross-dimensional electric-field inductors—"coils"—that extract energy from a seemingly infinite source. That source is the W dimension, a fourth plane that exists beyond the X, Y, and Z dimensions.

In this world, unofficial “illegal” coils harness powers that the police can’t hope to counter. Dealing with these coils is the job of coil-hating repo man Kyoma, whose run-in with the unique coil android Mira leads the two to form a reluctant partnership.”

Aired:  Jan 10, 2016 to Mar 27, 2016

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Politicizing Science Is Nothing New: It Happened To Ben Franklin

“But the “point effect” is more subtle. When there’s an electric field gradient, charges pool at the edge of a conductor. At a point, the charges reach a higher density than under any other conditions. More than perhaps two inches (5 cm) away from the tip of such a rod, the electric field around the top of the building becomes more dissipated. As a result, if there are many tall buildings around with lightning rods on them, lightning will be more likely to strike the ones without a pointed tip. The rod itself is more protection for a building if it does get struck by lightning, but the tip makes it less likely the building will be struck if there’s a better source around.”

You’ll often hear charges that science has become too politicized, but it’s the other way around. Science is our best way of drawing conclusions about the natural world, including how natural and human-caused phenomena work and interact together. When politics, biases, agendas or predispositions get in the way, however, they can derail actual knowledge and cause us to live in an inferior fashion. This isn’t new to modern times, but goes back at least hundreds of years, to Ben Franklin. Franklin, who invented the lightning rod, came up with the design that would save countless buildings from fire once that rod was applied. Yet the inability of many dogmatic people – including King George III of England – to accept the reality of the science led to a huge number of disasters and fires, many of which revisionist historians still try and cover up today.

The science doesn’t lie, and the safety and efficacy of modern, properly-implemented lightning rods is proof of that. But the story of how science was politicized way back in the 1700s is something we can all learn from.

You cannot deny your love for stingrays. They are a shark in every way from their cartilaginous skeleton to their ability to detect electric fields of prey.

AND THEY ARE A PANCAKE!