Lecture 16, PPT version
... • WD acts a lot like a metal (same temperature and density throughout) • Maximum WD mass = 1.4 Msun (“Chandrasekhar limit”) • WD with mass = 1 Msun is about the size of the earth, weight of 1 teaspoon of WD material = about the weight of a small truck • If all alone in space, WD simply cool off (no ...
... • WD acts a lot like a metal (same temperature and density throughout) • Maximum WD mass = 1.4 Msun (“Chandrasekhar limit”) • WD with mass = 1 Msun is about the size of the earth, weight of 1 teaspoon of WD material = about the weight of a small truck • If all alone in space, WD simply cool off (no ...
Atoms and Elements
... • Most of the universe’s hydrogen was synthesized in the first three minutes of the Big Bang, about 13.7 billion years ago, along with helium, and a light dusting of lithium. • As cosmic dust coalesces because of gravitational attraction, a star forms, which generates heat and light through the nucl ...
... • Most of the universe’s hydrogen was synthesized in the first three minutes of the Big Bang, about 13.7 billion years ago, along with helium, and a light dusting of lithium. • As cosmic dust coalesces because of gravitational attraction, a star forms, which generates heat and light through the nucl ...
–1– 4. Energy transport in stars Stars are hotter at the centre, hence
... energy transport in stars, and hence filling in the second piece of the key physics that supplement the four stellar equations; the others being the equation state and nuclear energy generation rate. ...
... energy transport in stars, and hence filling in the second piece of the key physics that supplement the four stellar equations; the others being the equation state and nuclear energy generation rate. ...
The Science with high intensity stable ion beams --Beam
... of the stable beam species and is actively pushing the necessary ion source R&D to extend the list of available beams. LNL is soon expected to reach this level of beam intensities also for very heavy nuclear beams (up tp U) once PIAVE will routinely replace the tandem as the injector for the ALPI li ...
... of the stable beam species and is actively pushing the necessary ion source R&D to extend the list of available beams. LNL is soon expected to reach this level of beam intensities also for very heavy nuclear beams (up tp U) once PIAVE will routinely replace the tandem as the injector for the ALPI li ...
Chapter 20: Radiant Energy from the Sun
... fission. In the fission of U-235 nuclei, excess free neutrons are produced. These neutrons can be used to induce fission in other U-235 nuclei, increasing the number of fissions taking place. Under controlled conditions, a chain reaction can occur, in which enough neutrons are produced by U-235 fiss ...
... fission. In the fission of U-235 nuclei, excess free neutrons are produced. These neutrons can be used to induce fission in other U-235 nuclei, increasing the number of fissions taking place. Under controlled conditions, a chain reaction can occur, in which enough neutrons are produced by U-235 fiss ...
The prompt and afterglow emission of GRB991216
... • The electric field oscillates for a time of the order of 103 104t C rather than simply going down to 0. • In the same time the electromagnetic energy is converted into energy of oscillating particles • Again we find that the microscopic charges are locked in a very small region: ...
... • The electric field oscillates for a time of the order of 103 104t C rather than simply going down to 0. • In the same time the electromagnetic energy is converted into energy of oscillating particles • Again we find that the microscopic charges are locked in a very small region: ...
Stellar Evolution
... planetary nebulae are produced by the expansion of a ‘fast stellar wind’ within a slowly expanding ’cloud’ which is denser near its equator than its poles.” • If so, where do the x-rays come from? ...
... planetary nebulae are produced by the expansion of a ‘fast stellar wind’ within a slowly expanding ’cloud’ which is denser near its equator than its poles.” • If so, where do the x-rays come from? ...
scholer-shocks-ii
... Is this the downstream thermalization? No! Process is time reversible. For dissipation we must have an irreversible process; entropy must increase! Scatter the resulting distribution! ...
... Is this the downstream thermalization? No! Process is time reversible. For dissipation we must have an irreversible process; entropy must increase! Scatter the resulting distribution! ...
The Salpeter plasma correction for solar fusion reactions
... version of dynamic screening, a different interpretation of the Gibbs probability distribution than is given in any standard treatments of statistical mechanics. In a discussion using classical (i.e., non-quantum mechanical) concepts, they argue that the Gibbs distribution may not be decomposable in ...
... version of dynamic screening, a different interpretation of the Gibbs probability distribution than is given in any standard treatments of statistical mechanics. In a discussion using classical (i.e., non-quantum mechanical) concepts, they argue that the Gibbs distribution may not be decomposable in ...
Stellar Evolution II
... • A core with remaining mass of 1.4 to 3 M, composed of tightly packed neutrons. • These tiny stars are much smaller than planet Earth -- in fact, they are about the diameter of a large city (~20 km). • One cubic centimeter (like a sugar cube) of a neutron star, would have a mass of about 1011 kg! ...
... • A core with remaining mass of 1.4 to 3 M, composed of tightly packed neutrons. • These tiny stars are much smaller than planet Earth -- in fact, they are about the diameter of a large city (~20 km). • One cubic centimeter (like a sugar cube) of a neutron star, would have a mass of about 1011 kg! ...
PH507lecnote07_mcp3
... These highly energetic particles with energies > 1 MeV can seriously compromise the sensitivity of photoconductors. How badly was seen very soon after the ISO space-craft was launched in 1995. From previous we saw that extrinsic photoconductivity is produced by exciting electrons into the conduction ...
... These highly energetic particles with energies > 1 MeV can seriously compromise the sensitivity of photoconductors. How badly was seen very soon after the ISO space-craft was launched in 1995. From previous we saw that extrinsic photoconductivity is produced by exciting electrons into the conduction ...
The Lives of Stars
... hydrogen (fuel), it burns it much faster than a less massive star – so it dies earlier. ...
... hydrogen (fuel), it burns it much faster than a less massive star – so it dies earlier. ...
SPACE CHARGE & Jets
... In this MSFC/NSSTC experiment, 3m SiO2 charged dust grains (green) acting as tracer test particles were suspended against gravity by the space charge formed at the equator of a DC-glow discharge plasma (purple) surrounding a NdFeB disk magnet (black). The dust was illuminated from the left with a sc ...
... In this MSFC/NSSTC experiment, 3m SiO2 charged dust grains (green) acting as tracer test particles were suspended against gravity by the space charge formed at the equator of a DC-glow discharge plasma (purple) surrounding a NdFeB disk magnet (black). The dust was illuminated from the left with a sc ...
Big Bang Theory - Clark Planetarium
... lithium). The hydrogen-helium mass ratio was about 75-25%. Microwaves with an energy corresponding to a temperature of about 3 K will be found everywhere in space. From Earth they will be “seen” across the entire sky. ...
... lithium). The hydrogen-helium mass ratio was about 75-25%. Microwaves with an energy corresponding to a temperature of about 3 K will be found everywhere in space. From Earth they will be “seen” across the entire sky. ...
E sporadico Winds Shear e forza di Lorentz english
... collisions cause the transformation of their kinetic energy into heat energy, consequently we have their vaporization and ionization The gas present in these areas, has been enriched with metal ions and their electrons. In the case of pressure differences, all the component particles move like the w ...
... collisions cause the transformation of their kinetic energy into heat energy, consequently we have their vaporization and ionization The gas present in these areas, has been enriched with metal ions and their electrons. In the case of pressure differences, all the component particles move like the w ...
Three-dimensional magnetized and rotating hot plasma equilibrium
... an adiabatic equation of state [8,9], which are not allowed kinetically. To satisfy constraints imposed on a drifting Maxwellian by the Fokker-Planck equation, only toroidal flow is allowed and the temperature must be a flux function [1,10-12]. Moreover, in the presence of rotation and gravity the d ...
... an adiabatic equation of state [8,9], which are not allowed kinetically. To satisfy constraints imposed on a drifting Maxwellian by the Fokker-Planck equation, only toroidal flow is allowed and the temperature must be a flux function [1,10-12]. Moreover, in the presence of rotation and gravity the d ...
kaekae14 dae dae15 lifecycleofastar
... cloud picks up stellar dust and other space junk the increasing gravity causes the cloud to collapse. As it collapses the cloud becomes smaller and hotter. After a few million years the low mass star begins to fuse helium into hydrogen. When this happens the collapse is ended because the fusion rais ...
... cloud picks up stellar dust and other space junk the increasing gravity causes the cloud to collapse. As it collapses the cloud becomes smaller and hotter. After a few million years the low mass star begins to fuse helium into hydrogen. When this happens the collapse is ended because the fusion rais ...
Full Text Report
... are treated explicitly, with electron capture rates determined from detailed balance with their corresponding autoionization rates. For lower ionization stages, autoionization states are not explicitly included in the atomic model, and effective dielectronic recombination rates are utilized. In HELI ...
... are treated explicitly, with electron capture rates determined from detailed balance with their corresponding autoionization rates. For lower ionization stages, autoionization states are not explicitly included in the atomic model, and effective dielectronic recombination rates are utilized. In HELI ...
X-Ray Scattering from Warm Dense Matter at Vulcan
... This makes the TAW area a versatile laboratory for experiments on WDM. Counter propagating long pulse beams simultaneously irradiate a plastic coated aluminium target (targets are produced on site, allowing user flexibility on their design). As the plastic ablates, the rocket like expansion drives s ...
... This makes the TAW area a versatile laboratory for experiments on WDM. Counter propagating long pulse beams simultaneously irradiate a plastic coated aluminium target (targets are produced on site, allowing user flexibility on their design). As the plastic ablates, the rocket like expansion drives s ...
THE RADIATION FROM AN ELECTRON MOVING IN A
... make nj ( w) finite everywhere), or set some limiting value nm for the refractive index nj, if we are interested in the total loss from the moving particle. In this case, the limits of the domain of integration will be given by the following inequalities (for more details, cf. Ref. 9 ): ~2nm ...
... make nj ( w) finite everywhere), or set some limiting value nm for the refractive index nj, if we are interested in the total loss from the moving particle. In this case, the limits of the domain of integration will be given by the following inequalities (for more details, cf. Ref. 9 ): ~2nm ...
q - Indico
... in a gas move randomly, colliding with gas molecules with a Maxwell energy distribution (average thermal energy 3/2 kT), with velocity v When an electric field is applied, they drift in the field direction with a mean velocity vd Energy distribution is Maxwellian with no field, but becomes complicat ...
... in a gas move randomly, colliding with gas molecules with a Maxwell energy distribution (average thermal energy 3/2 kT), with velocity v When an electric field is applied, they drift in the field direction with a mean velocity vd Energy distribution is Maxwellian with no field, but becomes complicat ...
Plasma Astrophysics
... • For ensemble of N particles of mass m and velocity v, average energy per particle is ...
... • For ensemble of N particles of mass m and velocity v, average energy per particle is ...
ppt - Wladimir Lyra
... What happens to the inert Helium core? It keeps contracting and heating At some point the density is so high it goes degenerate A phase transition has occured The core stops behaving like a gas and starts behaving more like a solid ...
... What happens to the inert Helium core? It keeps contracting and heating At some point the density is so high it goes degenerate A phase transition has occured The core stops behaving like a gas and starts behaving more like a solid ...
Fusor
A fusor is a device that uses an electric field to heat ions to conditions suitable for nuclear fusion. The machine has a voltage between two metal cages inside a vacuum. Positive ions fall down this voltage drop, building up speed. If they collide in the center, they can fuse. This is a type of Inertial electrostatic confinement device.A Farnsworth–Hirsch fusor is the most common type of fusor. This design came from work by Philo T. Farnsworth (in 1964) and Robert L. Hirsch in 1967. A variant of fusor had been proposed previously by William Elmore, James L. Tuck, and Ken Watson at the Los Alamos National Laboratory though they never built the machine.Fusors have been built by various institutions. These include academic institutions such as the University of Wisconsin–Madison, the Massachusetts Institute of Technology and government entities, such as the Atomic Energy Organization of Iran and the Turkish Atomic Energy Authority. Fusors have also been developed commercially, as sources for neutrons by DaimlerChrysler Aerospace and as a method for generating medical isotopes. Fusors have also become very popular for hobbyists and amateurs. A growing number of amateurs have performed nuclear fusion using simple fusor machines.