An exceptionally bright flare from SGR 1806–20 and the origins of
... neutron star interior (density r1015 r15 g cm23 ) is Dt < 2R=V A < 0:2B21 p15 s: Thus the 27 December event could have been a crustal instability that drove helicity from the star19,26. The unwinding of a toroidal magnetic field embedded in the crust is strongly impeded by the stable stratification ...
... neutron star interior (density r1015 r15 g cm23 ) is Dt < 2R=V A < 0:2B21 p15 s: Thus the 27 December event could have been a crustal instability that drove helicity from the star19,26. The unwinding of a toroidal magnetic field embedded in the crust is strongly impeded by the stable stratification ...
IGCSE Coordinated Science
... with the rate in which it is replenished. Examples include solar, wind and water energy. Every day, the sun comes out and we can indefinitely use its energy—for the time being at least. Non-Renewable sources of energy are resources that get exhausted when used, and basically when you use all of them ...
... with the rate in which it is replenished. Examples include solar, wind and water energy. Every day, the sun comes out and we can indefinitely use its energy—for the time being at least. Non-Renewable sources of energy are resources that get exhausted when used, and basically when you use all of them ...
QAT Trial 2013
... unable to explain the superconductivity of the ‘high temperature’ superconductors nowadays commonly found in high school laboratories, it has not yet been replaced by any alternative theory that can also explain the behaviour of these materials. Apart from one, all the following are precepts of the ...
... unable to explain the superconductivity of the ‘high temperature’ superconductors nowadays commonly found in high school laboratories, it has not yet been replaced by any alternative theory that can also explain the behaviour of these materials. Apart from one, all the following are precepts of the ...
Magnetism – Part 3
... Anything in the three chapters is fair game. Read the sections on charge and charge effects very carefully. We didn’t cover some of this in class. (Problem 2) Know the difference between Potential and Potential energy. Know how much work it takes to create a charge distribution. We did it in class. ...
... Anything in the three chapters is fair game. Read the sections on charge and charge effects very carefully. We didn’t cover some of this in class. (Problem 2) Know the difference between Potential and Potential energy. Know how much work it takes to create a charge distribution. We did it in class. ...
Electromagnetism and ElectroMagnetic Induction
... Engineers designing high-voltage power towers have to worry about the forces of the Earth’s magnetic field on the large currents being carried in the wires! Chpt 25 – Magnetism and Electromagnetic Induction ...
... Engineers designing high-voltage power towers have to worry about the forces of the Earth’s magnetic field on the large currents being carried in the wires! Chpt 25 – Magnetism and Electromagnetic Induction ...
SIMULATION OF QUIET-SUN WAVES IN THE Ca ii INFRARED TRIPLET
... showed beyond doubt the dynamic nature of the solar atmosphere. Their code, which is one-dimensional, nonmagnetic, and driven by a piston derived empirically from suitable time series observations, compares with observations of the Ca ii H and K bright grains remarkably well, even down to the level ...
... showed beyond doubt the dynamic nature of the solar atmosphere. Their code, which is one-dimensional, nonmagnetic, and driven by a piston derived empirically from suitable time series observations, compares with observations of the Ca ii H and K bright grains remarkably well, even down to the level ...
Low-energy charged particle measurement by MAP-PACE onboard SELENE
... counter-streaming (Earthward and tailward) flows often exist. They are a mixture of solar wind origin and of ionospheric origin. It is very important to know the origins and dynamics of these plasmas. With this knowledge, we can understand the formation mechanism of the magnetosphere and the structu ...
... counter-streaming (Earthward and tailward) flows often exist. They are a mixture of solar wind origin and of ionospheric origin. It is very important to know the origins and dynamics of these plasmas. With this knowledge, we can understand the formation mechanism of the magnetosphere and the structu ...
Demagnetisation of Permanent Magnets in Electrical Machines
... If this check shows a risk of demagnetisation, there are several things to do: The magnet grade can be changed to a grade with higher intrinsic coercivity. At the same time the remanence normally decreases. This means that the magnet has to be thicker to produce the same flux with less remanence. Th ...
... If this check shows a risk of demagnetisation, there are several things to do: The magnet grade can be changed to a grade with higher intrinsic coercivity. At the same time the remanence normally decreases. This means that the magnet has to be thicker to produce the same flux with less remanence. Th ...
Powerpoint
... A generator is the opposite of a motor – it transforms mechanical energy into electrical energy. This is an ac generator: The axle is rotated by an external force such as falling water or steam. The brushes are in constant electrical contact with the slip ...
... A generator is the opposite of a motor – it transforms mechanical energy into electrical energy. This is an ac generator: The axle is rotated by an external force such as falling water or steam. The brushes are in constant electrical contact with the slip ...
chapter14
... Equation of Continuity, cont m1 = m2 or r A1v1 Δt = r A2v2 Δt The fluid is incompressible, so r is a constant, and flow is constant. A1v1 = A2v2 = constant This is called the equation of continuity for fluids. The product of the area and the fluid speed at all points along a pipe is constant fo ...
... Equation of Continuity, cont m1 = m2 or r A1v1 Δt = r A2v2 Δt The fluid is incompressible, so r is a constant, and flow is constant. A1v1 = A2v2 = constant This is called the equation of continuity for fluids. The product of the area and the fluid speed at all points along a pipe is constant fo ...
Ferrofluid
A ferrofluid (portmanteau of ferromagnetic and fluid) is a liquid that becomes strongly magnetized in the presence of a magnetic field.Ferrofluid was invented in 1963 by NASA's Steve Papell as a liquid rocket fuel that could be drawn toward a pump inlet in a weightless environment by applying a magnetic field.Ferrofluids are colloidal liquids made of nanoscale ferromagnetic, or ferrimagnetic, particles suspended in a carrier fluid (usually an organic solvent or water). Each tiny particle is thoroughly coated with a surfactant to inhibit clumping. Large ferromagnetic particles can be ripped out of the homogeneous colloidal mixture, forming a separate clump of magnetic dust when exposed to strong magnetic fields. The magnetic attraction of nanoparticles is weak enough that the surfactant's Van der Waals force is sufficient to prevent magnetic clumping or agglomeration. Ferrofluids usually do not retain magnetization in the absence of an externally applied field and thus are often classified as ""superparamagnets"" rather than ferromagnets.The difference between ferrofluids and magnetorheological fluids (MR fluids) is the size of the particles. The particles in a ferrofluid primarily consist of nanoparticles which are suspended by Brownian motion and generally will not settle under normal conditions. MR fluid particles primarily consist of micrometre-scale particles which are too heavy for Brownian motion to keep them suspended, and thus will settle over time because of the inherent density difference between the particle and its carrier fluid. These two fluids have very different applications as a result.