Quantum Theory of Atomic and Molecular Structures and Interactions
... of the constituents has opened the door to many investigations into ultracold gases 1 . Since the late 1990’s many atomic species have been cooled to the ultracold regime, which is approximately defined as below a few µK. The ability to control the interactions between atoms has been a hallmark for ...
... of the constituents has opened the door to many investigations into ultracold gases 1 . Since the late 1990’s many atomic species have been cooled to the ultracold regime, which is approximately defined as below a few µK. The ability to control the interactions between atoms has been a hallmark for ...
Conductivity and magnetoresistance of a periodic composite by network discretization
... In this paper, we describe a simple alternative scheme for treating such composites, which focuses attention on a single unit cell in real space. The scheme, a natural outgrowth of the method described in Ref. 15, is basically to represent a unit cell of the periodic conductor as a (d-dimensional! s ...
... In this paper, we describe a simple alternative scheme for treating such composites, which focuses attention on a single unit cell in real space. The scheme, a natural outgrowth of the method described in Ref. 15, is basically to represent a unit cell of the periodic conductor as a (d-dimensional! s ...
PUBLISHED VERSION Two-fluid simulations of driven reconnection
... In the merging-compression method of plasma start-up, two flux-ropes with parallel toroidal current are formed around in-vessel poloidal field coils, before merging to form a spherical tokamak plasma. This start-up method, used in the Mega-Ampere Spherical Tokamak (MAST), is studied as a high Lundqu ...
... In the merging-compression method of plasma start-up, two flux-ropes with parallel toroidal current are formed around in-vessel poloidal field coils, before merging to form a spherical tokamak plasma. This start-up method, used in the Mega-Ampere Spherical Tokamak (MAST), is studied as a high Lundqu ...
CHARACTERIZING THE PERFORMANCE OF THE HOUGHTON COLLEGE CYCLOTRON By Daniel Haas
... difference that existed in this region. Once the ions made it inside an accelerator, they were shielded from the electric field, allowing them to move at a constant velocity until they reached the end of the accelerator. While the ion was travelling within the copper tube, the potential on the acce ...
... difference that existed in this region. Once the ions made it inside an accelerator, they were shielded from the electric field, allowing them to move at a constant velocity until they reached the end of the accelerator. While the ion was travelling within the copper tube, the potential on the acce ...
Wave-vector-dependent spin filtering and spin transport through
... W = 2 共in units of ᐉB兲 with = 0.2 for spin-up 共solid lines兲 and spindown 共dashed lines兲 quasiparticles at energy E = 1.05, 1.1, and 1.7 共from left to right, in units of Em兲; 共b兲 the same for a barrier of width W = 6 at energy E = 3.05, 3.1, and 3.7. Here we set B = 1 T, so that Em ⬇ 25 meV and an ...
... W = 2 共in units of ᐉB兲 with = 0.2 for spin-up 共solid lines兲 and spindown 共dashed lines兲 quasiparticles at energy E = 1.05, 1.1, and 1.7 共from left to right, in units of Em兲; 共b兲 the same for a barrier of width W = 6 at energy E = 3.05, 3.1, and 3.7. Here we set B = 1 T, so that Em ⬇ 25 meV and an ...
by B.S. University of Puerto Rico ... M.S. University of Puerto Rico (1973)
... corotational and the convective electric fields. An interesting aspect implied by Axford and Hines' model of the convective and corotational electric fields is that the flow velocity V given in equation (1.1) changes rapidly with position in space across the plasmapause. Following this model we infe ...
... corotational and the convective electric fields. An interesting aspect implied by Axford and Hines' model of the convective and corotational electric fields is that the flow velocity V given in equation (1.1) changes rapidly with position in space across the plasmapause. Following this model we infe ...
88JA03629 - Purdue Physics
... Kivelson [1987]. For example, where centrifugal forcesdominate, the Hamiltonian H is independent of particle energy and is a monotonically decreasing function of radial distance. Then, the condition for stability (27) is that the integral over It where the integrals are taken over the flux tube. Now ...
... Kivelson [1987]. For example, where centrifugal forcesdominate, the Hamiltonian H is independent of particle energy and is a monotonically decreasing function of radial distance. Then, the condition for stability (27) is that the integral over It where the integrals are taken over the flux tube. Now ...
Stabilization of Plasma by Nonuniform Magnetic Fields
... Thus, in order to keep a particle with a given v and J within a certain volume, the ф surface must be closed and remain entirely inside this volume. The condition is simplest for particles with ujv = 1, i.e., J = 0. For these particles ф simply denotes the length of the Une of force, and consequentl ...
... Thus, in order to keep a particle with a given v and J within a certain volume, the ф surface must be closed and remain entirely inside this volume. The condition is simplest for particles with ujv = 1, i.e., J = 0. For these particles ф simply denotes the length of the Une of force, and consequentl ...
Introduction to the AC/DC Module
... design electric and magnetic fields in statics and low-frequency applications. Simulations of this kind result in more powerful and efficient products and engineering methods. It allows its users to quickly and accurately predict electromagnetic field distributions, electromagnetic forces, and power ...
... design electric and magnetic fields in statics and low-frequency applications. Simulations of this kind result in more powerful and efficient products and engineering methods. It allows its users to quickly and accurately predict electromagnetic field distributions, electromagnetic forces, and power ...
Electromagnet
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.