Clumpy wind accretion in supergiant neutron star high mass X
... Figure 1 shows a snapshot at a fixed time of the wind structure produced by the model as a function of the distance from the massive star. The model predicts a quasi-continuous hierarchy of density and velocity structures in the wind, where dense shells are formed relatively close to the star during ...
... Figure 1 shows a snapshot at a fixed time of the wind structure produced by the model as a function of the distance from the massive star. The model predicts a quasi-continuous hierarchy of density and velocity structures in the wind, where dense shells are formed relatively close to the star during ...
MFF 3a: Charged Particle and a Straight Current
... located a distance of 1 cm from a long straight wire that is carrying a current of 8 A. The charge has a mass of 6 x 10-6 kg, and it is moving initially at 3 m/s parallel to the wire. I=8A 1 cm v = 3 m/s q =+7 nC ...
... located a distance of 1 cm from a long straight wire that is carrying a current of 8 A. The charge has a mass of 6 x 10-6 kg, and it is moving initially at 3 m/s parallel to the wire. I=8A 1 cm v = 3 m/s q =+7 nC ...
Physical origins and theoretical models of magnetic anisotropy
... uni form external field H. In order to unambiguously separate the magnetic anisotropy from energy contributions related to the exchange interaction (which are not of interest here), we rcstrict ourselves to situations where the unit vector O M of the magnetization dircction is uniform t,hroughout th ...
... uni form external field H. In order to unambiguously separate the magnetic anisotropy from energy contributions related to the exchange interaction (which are not of interest here), we rcstrict ourselves to situations where the unit vector O M of the magnetization dircction is uniform t,hroughout th ...
... is quantum mechanics which has 1932 by discovering a positively provided us the best model we have of charged electron, which he called the physical reality. We find the use of positron. Dirac’s argument applies all quantum mechanics in many particles, and not just electrons. It technological applic ...
Document
... l1 and l2 in opposite directions when placed a distance, y metres in a vacuum. (2 marks) Use the expression in (i) to define an ampere. (2 marks) ...
... l1 and l2 in opposite directions when placed a distance, y metres in a vacuum. (2 marks) Use the expression in (i) to define an ampere. (2 marks) ...
Silicon quantum electronics
... with each other. This means that the outcome of a measurement on one of the entangled qubits will influence the outcome of a measurement on the other, irrespective of how far the qubits are apart. There are detailed theoretical ideas that show how these properties of the quantum world can be used in ...
... with each other. This means that the outcome of a measurement on one of the entangled qubits will influence the outcome of a measurement on the other, irrespective of how far the qubits are apart. There are detailed theoretical ideas that show how these properties of the quantum world can be used in ...
Electric Currents In the Ocean Induced By the Geomagnetic Sq Field
... the shell. It was found that for the l d a y period variation field of Pi mode, a uniformly conductive sphere of 1S m-' below the depth of 780km can explain the observed response if the effects of the shell are considered. This depth of 780 km is an interesting value, because from the study of the s ...
... the shell. It was found that for the l d a y period variation field of Pi mode, a uniformly conductive sphere of 1S m-' below the depth of 780km can explain the observed response if the effects of the shell are considered. This depth of 780 km is an interesting value, because from the study of the s ...
- SlideBoom
... individual field pole windings are connected in series in such a way that when the field winding is energized by the d.c. exciter, adjacent poles have opposite diesel engines or water turbines have salient pole type rotors due to the following reasons: (a) The salient field poles would cause .an exc ...
... individual field pole windings are connected in series in such a way that when the field winding is energized by the d.c. exciter, adjacent poles have opposite diesel engines or water turbines have salient pole type rotors due to the following reasons: (a) The salient field poles would cause .an exc ...
Generators and transformers
... round a number of turns, producing a flux. Use the gimballed bar magnet to probe this flux. You should be able to show the magnetic circuit. Draw attention to the linked rings of the electric circuit (current round the coils) and the magnetic circuit (flux round and round the magnetic circuit). Note ...
... round a number of turns, producing a flux. Use the gimballed bar magnet to probe this flux. You should be able to show the magnetic circuit. Draw attention to the linked rings of the electric circuit (current round the coils) and the magnetic circuit (flux round and round the magnetic circuit). Note ...
Superconductivity
Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In ordinary conductors, such as copper or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.In 1986, it was discovered that some cuprate-perovskite ceramic materials have a critical temperature above 90 K (−183 °C). Such a high transition temperature is theoretically impossible for a conventional superconductor, leading the materials to be termed high-temperature superconductors. Liquid nitrogen boils at 77 K, and superconduction at higher temperatures than this facilitates many experiments and applications that are less practical at lower temperatures.