Laboratory Astrophysics: Spectral Analysis of Photoionized Neon J ames MacArthur
... noble gas. Most neutral atoms have ionization energies between 5 and 10 eV. ...
... noble gas. Most neutral atoms have ionization energies between 5 and 10 eV. ...
Laboratory Astrophysics: Spectral Analysis of Photoionized Neon
... The gas surrounding a High Mass X-ray Binary (HMXB), conceptualized in Figure 1.3, is a classic example of a photoionized plasma. This binary system consists of a compact object (a neutron star or stellar black hole) accreting mass from its large companion (an O or B star - the most luminous types o ...
... The gas surrounding a High Mass X-ray Binary (HMXB), conceptualized in Figure 1.3, is a classic example of a photoionized plasma. This binary system consists of a compact object (a neutron star or stellar black hole) accreting mass from its large companion (an O or B star - the most luminous types o ...
Spectral modeling of nebular-phase supernovae Anders Jerkstrand Department of Astronomy
... the 20th century, calculations showed that stars were not this hot inside (the sun is only ∼ 107 K at its center), and fusion was therefore rejected as their power source. However, two effects make fusion effective even at ∼ 103 times lower temperature; some nuclei have much higher kinetic energies ...
... the 20th century, calculations showed that stars were not this hot inside (the sun is only ∼ 107 K at its center), and fusion was therefore rejected as their power source. However, two effects make fusion effective even at ∼ 103 times lower temperature; some nuclei have much higher kinetic energies ...
Neutron stars and pulsars
... The spectrum of curvature radiation is similar to that of synchrotron radiation. For electrons, incoherent curvature radiation is generally much weaker than synchrotron radiation. It therefore require coherent process, if the pulsar radio emission is due to curvature radiation. ...
... The spectrum of curvature radiation is similar to that of synchrotron radiation. For electrons, incoherent curvature radiation is generally much weaker than synchrotron radiation. It therefore require coherent process, if the pulsar radio emission is due to curvature radiation. ...
Neutron Degeneracy Pressure
... white dwarf stars, the pull of gravity would become too great for the thermal pressure to counteract, forcing the star to implode, which could possibly result in the formation of a black hole. Let us briefly look at some properties of white dwarf and neutron stars. The two types of stars mentioned a ...
... white dwarf stars, the pull of gravity would become too great for the thermal pressure to counteract, forcing the star to implode, which could possibly result in the formation of a black hole. Let us briefly look at some properties of white dwarf and neutron stars. The two types of stars mentioned a ...
- EPJ Web of Conferences
... and density, the low frequency of collisions and the short useable area of the jet have prevented its generalised use in studies of chemical reactions although several ion-molecule reactions have been investigated [20]. For these processes, the long range electrostatic forces are strong enough to at ...
... and density, the low frequency of collisions and the short useable area of the jet have prevented its generalised use in studies of chemical reactions although several ion-molecule reactions have been investigated [20]. For these processes, the long range electrostatic forces are strong enough to at ...
Chapter 5 Stellar Energy Production
... is fusion of hydrogen into helium. Two general sets of reactions can accomplish this: 1. The proton–proton chain (PP chain) 2. The CNO cycle Generally we find that • The proton–proton chain produces most of the present energy of the Sun and generally is dominant in stars of a solar mass or less. • T ...
... is fusion of hydrogen into helium. Two general sets of reactions can accomplish this: 1. The proton–proton chain (PP chain) 2. The CNO cycle Generally we find that • The proton–proton chain produces most of the present energy of the Sun and generally is dominant in stars of a solar mass or less. • T ...
Upper ionosphere of Mars is not axially symmetrical
... to a more effective screening of the ionosphere in the hemisphere in which the motional electric field is pointed outward the planet (the E + hemisphere). On the other hand, the forces due to the normal and tangential magnetic field tensions driving the planetary plasma into motion are also stronger ...
... to a more effective screening of the ionosphere in the hemisphere in which the motional electric field is pointed outward the planet (the E + hemisphere). On the other hand, the forces due to the normal and tangential magnetic field tensions driving the planetary plasma into motion are also stronger ...
The Magic of Star Dust - Exploring Exotic Nuclei
... the stars. The stars, including our sun shine due to the energy released by nuclear reactions. Only a small handful of all the nuclei found in our universe exist on earth. Most of these are known as ‘stable nuclei’ because they are not radioactive. Ever since the discovery of the nucleus by Ernst Ru ...
... the stars. The stars, including our sun shine due to the energy released by nuclear reactions. Only a small handful of all the nuclei found in our universe exist on earth. Most of these are known as ‘stable nuclei’ because they are not radioactive. Ever since the discovery of the nucleus by Ernst Ru ...
CH30 p798
... for the missing mass of the nucleus without increasing its charge. Mass and charge of the nucleus The only charged particle in the nucleus is the proton. The atomic number, Z, of an atom is the number of protons. The total charge of the nucleus is the number of protons times the elementary charge, e ...
... for the missing mass of the nucleus without increasing its charge. Mass and charge of the nucleus The only charged particle in the nucleus is the proton. The atomic number, Z, of an atom is the number of protons. The total charge of the nucleus is the number of protons times the elementary charge, e ...
Solar chromospheric flares: energy release, transport and radiation
... in the impulsive phase. Later on, particularly in so-called long duration events (LDEs) when the field has simplified into a clear arcade or cusp structure, there is evidence from the anomalously long-lived hot coronal plasma that substantial energy release may continue throughout the gradual phase ...
... in the impulsive phase. Later on, particularly in so-called long duration events (LDEs) when the field has simplified into a clear arcade or cusp structure, there is evidence from the anomalously long-lived hot coronal plasma that substantial energy release may continue throughout the gradual phase ...
Plasma Seminar, April 13, 2015 "The Magnetized Dusty Plasmas
... Particle size considerations • The ability to produce magnetized dust at reasonable magnetic field strengths requires the use of small particles • However, we would also like to be able to image the particles via Mie scattering using visible light** • This places a practical lower limit on the diam ...
... Particle size considerations • The ability to produce magnetized dust at reasonable magnetic field strengths requires the use of small particles • However, we would also like to be able to image the particles via Mie scattering using visible light** • This places a practical lower limit on the diam ...
Possible new astrophysics-relevant experiments with high
... References: 1) D.D. Ryutov. “Destabilizing effect of thermal conductivity on the Rayleigh-Taylor instability in a plasma,” Phys. Plasmas, 7, 4797, 2000. 2) D.D. Ryutov, J.Kane, M. Pound, and B. Remington.”Instability of the ablatively accelerated slab for the case of non-normal irradiation.” Plasma ...
... References: 1) D.D. Ryutov. “Destabilizing effect of thermal conductivity on the Rayleigh-Taylor instability in a plasma,” Phys. Plasmas, 7, 4797, 2000. 2) D.D. Ryutov, J.Kane, M. Pound, and B. Remington.”Instability of the ablatively accelerated slab for the case of non-normal irradiation.” Plasma ...
n - Indico
... Intense H+, 4He+, 12C+ e 12C++ beams in the energy range: 350 keV-3.5 MeV. Two beam lines with all necessary elements (magnets, pumps, valves,...). Total budget (about 3.9 Meuro) from LUNA MV «Premium projects» (total 5.3 Meuro) of the Italian Research Ministry Tender assigned to HVEE in December 20 ...
... Intense H+, 4He+, 12C+ e 12C++ beams in the energy range: 350 keV-3.5 MeV. Two beam lines with all necessary elements (magnets, pumps, valves,...). Total budget (about 3.9 Meuro) from LUNA MV «Premium projects» (total 5.3 Meuro) of the Italian Research Ministry Tender assigned to HVEE in December 20 ...
0.1 Chapter 2
... 3. The reaction rate is proportional to the area under the product of the two terms. Draw a similar sketch as in question (b) but now for a higher temperature. Explain why and how the reaction rate depends on the temperature. Answer: For a higher temperature the graph is shifted a bit to the right ...
... 3. The reaction rate is proportional to the area under the product of the two terms. Draw a similar sketch as in question (b) but now for a higher temperature. Explain why and how the reaction rate depends on the temperature. Answer: For a higher temperature the graph is shifted a bit to the right ...
Synergistic effect of sterilization by microwave-excited atmospheric-pressure plasma jet using photo-catalyst TiO2 with H2O2 and distilled water
... In particular, the plasma treatment of using both H2O2 and TiO2 (HTP treatment) resulted in outstanding inactivation of S. mutans, all the bacteria were killed in 30 s. It should be noted that there was significantly synergistic bactericidal action of the HTP treatment in comparison with two cases, ...
... In particular, the plasma treatment of using both H2O2 and TiO2 (HTP treatment) resulted in outstanding inactivation of S. mutans, all the bacteria were killed in 30 s. It should be noted that there was significantly synergistic bactericidal action of the HTP treatment in comparison with two cases, ...
Who’s Afraid of a Stellar Superflare? Rachel Osten GSFC
... superflaring in normal stars -- Schaefer et al. (2000) normal solar-like stars undergoing flaring events with energy releases 1033-1038 ergs, occurring roughly once every 100 years or so ...
... superflaring in normal stars -- Schaefer et al. (2000) normal solar-like stars undergoing flaring events with energy releases 1033-1038 ergs, occurring roughly once every 100 years or so ...
Document
... Quark/hybrid stars: typically refer to a NS whose cores contain a mixed phase of confined and deconfined matter. These stars are bound by gravity. Strange stars: refer to stars that have only unconfined matter, in the form of u, d, and s quarks. These stars are not bound by gravity but are rather on ...
... Quark/hybrid stars: typically refer to a NS whose cores contain a mixed phase of confined and deconfined matter. These stars are bound by gravity. Strange stars: refer to stars that have only unconfined matter, in the form of u, d, and s quarks. These stars are not bound by gravity but are rather on ...
Available online www.jsaer.com Journal of Scientific and
... Journal of Scientific and Engineering Research, 2016, 3(3):55-63 Research Article ...
... Journal of Scientific and Engineering Research, 2016, 3(3):55-63 Research Article ...
Spheromaks, solar prominences, and Alfvén instability of current
... to inject helicity to make up for the slow resistive losses. It is also necessary to inject helicity when creating a spheromak. Helicity injection in spheromaks is typically accomplished using a magnetized plasma gun source designed to impose a finite electrostatic potential difference across the en ...
... to inject helicity to make up for the slow resistive losses. It is also necessary to inject helicity when creating a spheromak. Helicity injection in spheromaks is typically accomplished using a magnetized plasma gun source designed to impose a finite electrostatic potential difference across the en ...
the holifield radioactive ion beam facility at the oak ridge
... Power is supplied from the instrumentation platform to components mounted on the hardware platform (e.g., the isotope-separator magnet, electrostatic lenses, the target ion source, etc.) through two electrically isolated conduits maintained at either platform potential or platform-plus-ion-source po ...
... Power is supplied from the instrumentation platform to components mounted on the hardware platform (e.g., the isotope-separator magnet, electrostatic lenses, the target ion source, etc.) through two electrically isolated conduits maintained at either platform potential or platform-plus-ion-source po ...
Electron Firehose instability and acceleration of electrons in solar
... 1) Shock Acceleration: There are two types of shock acceleration. The one referred to as ’shock drift acceleration’ involves the shock electric field that reflects and accelerates the particles moving along the shock surface. Since this mechanism is only effective when the shock normal approaches an ...
... 1) Shock Acceleration: There are two types of shock acceleration. The one referred to as ’shock drift acceleration’ involves the shock electric field that reflects and accelerates the particles moving along the shock surface. Since this mechanism is only effective when the shock normal approaches an ...
Electron and Ion Dynamics of the Solar Wind Interaction with a
... cometocentric distance equals the mean free path for collisions with neutrals, to characterize the validity of this assumption. For Q ¼ 1026 s−1, we find the ion exobase at 3 km above the surface of the nucleus [35,51]. The electrons are collisionless down to the nucleus. Note that the ion value is ...
... cometocentric distance equals the mean free path for collisions with neutrals, to characterize the validity of this assumption. For Q ¼ 1026 s−1, we find the ion exobase at 3 km above the surface of the nucleus [35,51]. The electrons are collisionless down to the nucleus. Note that the ion value is ...
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.