Other advancements are being made in the field of MRI. Functional MRI (fMRI), for example, creates brain maps of nerve cell activity second by second and is helping researchers better understand how the brain works. Magnetic resonance angiography (MRA) creates images of flowing blood, arteries ...
Magnets are objects that produce magnetic fields and attract metals like iron, nickel and cobalt. The magnetic field's lines of force exit the magnet from its north pole and enter its south pole. Permanent or hard magnets create their own magnetic field all the time. Temporary or soft ...
On the other hand, the north end of one magnet will repel the north end of the other (and similarly, south will repel south). An electromagnet is the same way, except it is temporary — the magnetic field only exists when the electric current flows. You can determine the strength of a...
Originating from Earth’s core and atoms themselves, magnetism is the invisible force that shapes our everyday lives. Here’s how magnets actually work.
There is also a tool called demagnetizer. They are also known asdegaussers. The reason why these tools are used is to eradicate any magnetic field in an area where it can create problems or interruptions. Sometimes, they can even add a magnetic field to a ferromagnetic part, temporarily. Us...
The transition parameter is based on the electron characteristics close to the Earth's dayside magnetopause, but reveals systematic ordering of other, independent, data such as the ion flow, density and temperature and the orientation and strength of the magnetic field. Potentially, therefore, it ...
The magnetic field stretches out to the second wire. Electrons begin to flow in the second wire whenever the magnetic field in the first wire changes. Connecting and disconnecting the battery changes the magnetic field. One important thing to notice is that electrons flow in the second wire only...
How the Universe Works《了解宇宙是如何运行的(2010)》第六季第五集完整中英文对照剧本.docx,神秘的光 Mysterious lights 来自遥远的深空,它的亮度 shine out from the edge of space, 比一万亿颗太阳还要亮 brighter than a trillion suns. 它们一定是我们在宇宙中见过
These bearings allow the flywheel to float on a magnetic field created by the bearing. Some of the flywheels run at speeds in excess of 50,000 revolutions per minute (rpm). Normal bearings with rollers or balls would melt down or explode at these speeds. The magnetic bearing has no moving...
A capacitor stores energy in the form of an electrostatic field, while an inductor uses a magnetic field. Imagine the following circuit: If you charge up the capacitor with a battery and then insert the inductor into the circuit, here's what will happen: The capacitor will start to ...