But on the macroscale, magnetite is permanently magnetic. Nanotechnology takes advantage of special properties at the nanoscale— such as paramagnetism—to create new materials and devices. Ferrofluid is used in seals in computer hard drives and other rotating shaft motors, and in loudspeakers to dampen vibrations. In the future,
These processes are also known as cold working. In our lab, we showed how cold working will increase the strength of a metal material by inducing plastic deformation on a steel sample and an aluminum sample using an MTI tensile testing machine. INTRODUCTION Work Hardening Work hardening is defined as the phenomenon that occurs when a metal is strained beyond the yield point. Increasing stress is required to produce additional plastic deformation causing the metal to become stronger and more difficult to deform. If true stress is plotted against true strain, the rate of strain hardening tends to become almost uniform, that is, the curve becomes almost a straight line [2].
The stronger the magnet the greater the field. The static magnetic field can have mechanical effects on the pacemaker. It has been known to effect certain parts of the pacemaker allowing it to revert to different intervals of pacing. It also has the ability to reprogram or reset the device all together. The static magnetic field exerts a magnetic force that can dislodge the pacemaker leads.
the speed of the stator flux is same as that of rotor flux. Wound Rotor Synchronous Generator (WRSG) is also called the Electrically Excited Synchronous Generator (EESG), where it is excitation is done with a coil. While the excitation for the Permanent Magnet Synchronous Generator (PMSG) is provided by a permanent magnet. Both the WRIG and PMSG are also called as Full-size Converter generator (14). Figure 2 6 WRSG based WTs In WRSG the machine side converter (MSC) uses a passive rectifier and the generator is controlled through a excitation control using DC/DC converter in the rotor winding.
When we use some electric appliances, the electromagnetic waves of these appliances will change periodically and produce enough energy to cause ionization. As we all known, ionization can dislodge orbiting electrons from atoms or break bonds which hold molecules together and then producing ions or charged particles. During this process, the production of ions or ionization in our tissues may cause direct damage to cells and cause other health risks. So EMF radiation is also called ionizing radiation. (DCMNR, 2005) This conception maybe a little bit confusing, but it’s easy to find out that EMF really produces some extra electrons or magnetic field which we have never seen before.
He claimed that the brain itself was the most important organ for secretion of this electric fluid, and the nerves were responsible for conducting this fluid to muscles and tissues. * The brain and the nerves do generate electric impulses that cause muscles to contract under a physiological state (that is, when the animal is alive). However, these electric impulses are much smaller than ones produced by the contact of two metals and are not present when an animal is killed. Alessandro Volta was a physics professor who made many contributions to the knowledge of electricity. * He invented the electrophorus, a device used to generate static electricity.
The permanent magnet is fixed firmly into position whereas the electromagnet is mobile. As pulses of electricity pass through the coil of the electromagnet, the direction of its magnetic field is rapidly changed. This means that it is in turn attracted to and repelled from the permanent magnet, vibrating back and forth. The electromagnet is attached to a cone made of a flexible material such as paper or plastic which amplifies these vibrations, pumping sound waves into the surrounding air and towards your ears. Inside a speaker: 1.
Static electricity is produced from a process known as triboelectrification. To show how much static electricity an object has, it is determined by its position on the triboelectric series. Its position on this scale is determined by how tight the atom is holding the electrons. An atom is more positive in the triboelectric series if a material is more apt to give up electrons when in contact with another material. If a material is more apt to "capture" electrons when in contact with another material, it is more
But when they change or move together, they make waves - electromagnetic waves. Electric fields and magnetic fields create an electromagnetic wave Electromagnetic waves are formed when an electric field (which is shown in blue arrows) couples with a magnetic field (which is shown in red arrows). Magnetic and electric fields of an electromagnetic wave are perpendicular to each other and to
In an EV, the electric motor is of ‘paramount importance’ [1] as the main drive system. Electric cars have an electric motor and a controller powering the motor. Rechargeable batteries are used to provide power to the controller. Electric cars have more wires in them compared to gasoline car’s, this is because gas-powered cars have an abundance of hoses, pipes and fuel lines instead. Electric cars have not only now become a possible future within the way all vehicles are powered, but they’re expected to start rolling of the assembly lines of major automobile manufacturers in the next few years.