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You searched for subject:(quantum Coulomb plasma). Showing records 1 – 2 of 2 total matches.

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University of Southern California

1. Liang, Yung-Ching. On the Feynman path into the sun.

Degree: PhD, Physics, 2013, University of Southern California

This study deals with solar-physics applications of a recent equation-of-state formalism based on the formulation of the so-called ""Feynman-Kac (FK) representation"". This formalism leads to an exact virial expansion of the thermodynamic functions in powers of the particle densities of a Coulomb plasma (""exact"" here refers to the accuracy of the low-order virial coefficients of the expansion). By taking advantage of the exact and analytic form of this virial expansion, we can probe the thermodynamic properties of the solar interior, both in detail and to an accuracy that has so far not been achieved with currently available equation-of-state formalisms. For reacting plasmas, virial-expansion equation of state have an intrinsic problem when the plasma is less than fully ionized. Fortunately, in most parts of the Sun's interior, the plasma is almost completely ionized. Therefore, the FK virial equation of state can be applicable, but only in the deeper (and hotter) solar interior. The precise boundary of the domain of validity of the virial expansion depends on the elements included in the formalism. Since the computational effort increases tremendously with an increasing number of chemical elements, here, we choose to represent the heavier elements by a single one, oxygen. This approximation is reasonable for the following reason. In the Sun, the major heavy elements (that is, the elements other than H and He which together comprise more than 98% of the mass fraction) are C, N and O. They all have a similar effect in the equation of state. Then, the other elements, such as Fe and Ne, are so little abundant that they have altogether a very small effect in the equation of state (although they are very important in spectroscopy). Assuming the relevant constituents of the Sun to be H, He, and O, we have examined the effects on thermodynamic quantities from each of these components. With the aid of the FK formalism, we have studied the influences of the contributions to the respective different partial pressure. This not only helps us to understand the intrinsic challenge of applying the virial expansion, but also to analyze the various effects quantitatively. We have also tackled the aforementioned main limitation of the virial expansion, that is, its breakdown for relatively low temperatures, where the plasma is clearly less than fully ionized. For this, we have replaced the virial equation for these outer regions for the Sun by another, similar equation of state, the so-called ""scaled low temperature (SLT)"" expansion. Current versions of SLT are so far only for one chemical element, therefore restricted to the hydrogen part of the solar plasma. However, since hydrogen is the most abundant element in the Sun (more than 90% by number), SLT in its current form is already useful, if one adds the contributions of the remaining elements (He and heavy elements) using conventional equation-of-state formalisms. In such a procedure, an improved H part and a conventional treatment of the other elements will none the less lead… Advisors/Committee Members: Haas, Stephan (Committee Chair), D├Ąppen, Werner (Committee Member), Dappen, Werner (Committee Member), Daeppen, Werner (Committee Member), Bickers, Nelson Eugene (Committee Member), Nakano, Aiichiro (Committee Member), Wang, Joseph (Committee Member).

Subjects/Keywords: EOS; equation of state; virial expansion; scaled low temperature expansion; Feynman-Kac path integral; Sun; quantum Coulomb plasma; MHD; OPAL; CEFF

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Liang, Y. (2013). On the Feynman path into the sun. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/299212/rec/4532

Chicago Manual of Style (16th Edition):

Liang, Yung-Ching. “On the Feynman path into the sun.” 2013. Doctoral Dissertation, University of Southern California. Accessed April 19, 2019. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/299212/rec/4532.

MLA Handbook (7th Edition):

Liang, Yung-Ching. “On the Feynman path into the sun.” 2013. Web. 19 Apr 2019.

Vancouver:

Liang Y. On the Feynman path into the sun. [Internet] [Doctoral dissertation]. University of Southern California; 2013. [cited 2019 Apr 19]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/299212/rec/4532.

Council of Science Editors:

Liang Y. On the Feynman path into the sun. [Doctoral Dissertation]. University of Southern California; 2013. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/299212/rec/4532


University of Florida

2. Woltz, Lawrence A., 1949- ( Dissertant ). Stark broadening in laser-produced plasmas full Coulomb calculation.

Degree: 1982, University of Florida

This work is a study of the Stark broadening of spectral lines

Subjects/Keywords: Approximation; Asymmetry; Electron scattering; Electrons; Ions; Line spectra; Plasmas; Power lines; Quantum numbers; Radiators; Coulomb excitation; Physics thesis Ph. D; Plasma radiation; Plasma spectroscopy; Stark effect

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Woltz, Lawrence A., 1. (. D. ). (1982). Stark broadening in laser-produced plasmas full Coulomb calculation. (Thesis). University of Florida. Retrieved from http://ufdc.ufl.edu/UF00099368

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Woltz, Lawrence A., 1949- ( Dissertant ). “Stark broadening in laser-produced plasmas full Coulomb calculation.” 1982. Thesis, University of Florida. Accessed April 19, 2019. http://ufdc.ufl.edu/UF00099368.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Woltz, Lawrence A., 1949- ( Dissertant ). “Stark broadening in laser-produced plasmas full Coulomb calculation.” 1982. Web. 19 Apr 2019.

Vancouver:

Woltz, Lawrence A. 1(D). Stark broadening in laser-produced plasmas full Coulomb calculation. [Internet] [Thesis]. University of Florida; 1982. [cited 2019 Apr 19]. Available from: http://ufdc.ufl.edu/UF00099368.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Woltz, Lawrence A. 1(D). Stark broadening in laser-produced plasmas full Coulomb calculation. [Thesis]. University of Florida; 1982. Available from: http://ufdc.ufl.edu/UF00099368

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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