Plasma Temperature Inference from Deuterium-Tritium/Deuterium-Deuterium Neutron Discrimination

NOTE: This article was published in a former series of GEUS Bulletin. Please use the original series name when citing this article, for example: Brodersen, K. P., & Anderson, N. J. (2000). Subfossil insect remains (Chironomidae) and lake-water temperature inference in the Sisimiut–Kangerlussuaq region, southern West Greenland. Geology of Greenland Survey Bulletin, 186, 78-82. https://doi.org/10.34194/ggub.v186.5219 _______________ Climate and water temperature have an important influence on the functioning of lake ecosystems. From limnological and palaeolimnological studies of lakes, information on biological diversity and climate variability in time and space can be gleaned from physical, chemical and biological indicators preserved in the lake sediments. The lakes in southern West Greenland are particularly useful for this purpose – they are numerous, diverse and have minimal anthropogenic impact (Anderson & Bennike 1997). Palaeolimnological data are fundamental for understanding the functioning and development of modern lakes and for understanding the causes of climatic change as well as the effect on lake biota.

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Low-frequency heating of doublets

Journal of Plasma Physics ◽

10.1017/s002237780002300x ◽

1981 ◽

Vol 25 (1) ◽

pp. 133-143 ◽

Cited By ~ 4

Author(s):

T. H. Jensen ◽

F. W. McClain ◽

H. Grad

Keyword(s):

Physical Model ◽

Linear Theory ◽

Low Frequency ◽

Plasma Temperature ◽

Auxiliary Heating ◽

Power Sources ◽

Axisymmetric Mode ◽

Low Frequency Power ◽

Frequency Power ◽

Frequency Heating

Heating of a doublet plasma by driving an axisymmetric mode at low frequency may be an attractive means for auxiliary heating. The attractiveness of the method stems from (1) the low technology required for low-frequency power sources, (2) the fact that the field-shaping coils required for doublets may also be used as the antennae for transmitting the power, (3) the possibility of transmitting the power through a resistive vacuum wall, (4) the insensitivity to the plasma temperature and density and (5) the relative simplicity of the physical model. The utility of the concept depends on the existence of a special axisymmetric eigenmode in the resistive M.HD approximation which is used. This mode has nodes through the elliptic axes of the doublet equilibrium and an antinode at the hyperbolic axis. It is remarkable that the dissipation per cycle of this mode remains large at low plasma resistivity. This paper describes a linear theory for such heating.

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Gold Nanoparticle-Enhanced Laser-Induced Breakdown Spectroscopy and Three-Dimensional Contour Imaging of an Aluminum Alloy

Applied Spectroscopy ◽

10.1177/0003702820973040 ◽

2020 ◽

pp. 000370282097304

Author(s):

Amal A. Khedr ◽

Mahmoud A. Sliem ◽

Mohamed Abdel-Harith

Keyword(s):

Gold Nanoparticles ◽

Aluminum Alloy ◽

Three Dimensional ◽

Plasma Temperature ◽

Spectral Lines ◽

Laser Induced Breakdown Spectroscopy ◽

Al Alloy ◽

Boltzmann Plot ◽

Breakdown Spectroscopy ◽

Laser Induced Breakdown

In the present work, nanoparticle-enhanced laser-induced breakdown spectroscopy was used to analyze an aluminum alloy. Although LIBS has numerous advantages, it suffers from low sensitivity and low detection limits compared to other spectrochemical analytical methods. However, using gold nanoparticles helps to overcome such drawbacks and enhances the LIBS sensitivity in analyzing aluminum alloy in the current work. Aluminum was the major element in the analyzed samples (99.9%), while magnesium (Mg) was the minor element (0.1%). The spread of gold nanoparticles onto the Al alloy and using a laser with different pulse energies were exploited to enhance the Al alloy spectral lines. The results showed that Au NPs successfully improved the alloy spectral lines intensity by eight times, which could be useful for detecting many trace elements in higher matrix alloys. Under the assumption of local thermodynamic equilibrium, the Boltzmann plot was used to calculate the plasma temperature. Besides, the electron density was calculated using Mg and H lines at Mg(I) at 285.2 nm and Hα(I) at 656.2 nm, respectively. Three-dimensional contour mapping and color fill images contributed to understanding the behavior of the involved effects.

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Plasma temperature incineration

Environmental Progress ◽

10.1002/ep.670020105 ◽

1983 ◽

Vol 2 (1) ◽

pp. 7-10 ◽

Cited By ~ 5

Author(s):

James R. Hollis

Keyword(s):

Plasma Temperature

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Polar patches observed by ESR and their possible origin in the cusp region

Annales Geophysicae ◽

10.1007/s00585-000-1043-5 ◽

2000 ◽

Vol 18 (9) ◽

pp. 1043-1053 ◽

Cited By ~ 12

Author(s):

A. M. Smith ◽

S. E. Pryse ◽

L. Kersley

Keyword(s):

Energy Distribution ◽

Electron Density ◽

Plasma Flow ◽

Plasma Temperature ◽

Soft Particle ◽

Polar Ionosphere ◽

Polar Cap ◽

Particle Precipitation ◽

Cusp Region ◽

Reconnection Site

Abstract. Observations by the EISCAT Svalbard radar in summer have revealed electron density enhancements in the magnetic noon sector under conditions of IMF Bz southward. The features were identified as possible candidates for polar-cap patches drifting anti-Sunward with the plasma flow. Supporting measurements by the EISCAT mainland radar, the CUTLASS radar and DMSP satellites, in a multi-instrument study, suggested that the origin of the structures lay upstream at lower latitudes, with the modulation in density being attributed to variability in soft-particle precipitation in the cusp region. It is proposed that the variations in precipitation may be linked to changes in the location of the reconnection site at the magnetopause, which in turn results in changes in the energy distribution of the precipitating particles.Key words: Ionosphere (ionosphere-magnetosphere interactions; plasma temperature and density; polar ionosphere)

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Tomographic Measurements of Plasma Temperature Fields

Beiträge aus der Plasmaphysik ◽

10.1002/ctpp.19840240410 ◽

1984 ◽

Vol 24 (4) ◽

pp. 417-430 ◽

Cited By ~ 4

Author(s):

V. V. Pickalov ◽

T. S. Melnikova

Keyword(s):

Plasma Temperature ◽

Temperature Fields

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Influence of Lead on the Interpretation of Bone Samples with Laser-Induced Breakdown Spectroscopy

Journal of Spectroscopy ◽

10.1155/2016/8205479 ◽

2016 ◽

Vol 2016 ◽

pp. 1-6

Author(s):

Abdolhamed Shahedi ◽

Esmaeil Eslami ◽

Mohammad Reza Nourani

Keyword(s):

Plasma Temperature ◽

Laser Induced Breakdown Spectroscopy ◽

Plasma Parameters ◽

Time Duration ◽

Laboratory Rats ◽

Breakdown Spectroscopy ◽

Laser Induced Breakdown ◽

Group A ◽

Atomic Lines ◽

Group B

This study is devoted to tracing and identifying the elements available in bone sample using Laser-Induced Breakdown Spectroscopy (LIBS). The bone samples were prepared from the thigh of laboratory rats, which consumed 325.29 g/mol lead acetate having 4 mM concentration in specified time duration. About 76 atomic lines have been analyzed and we found that the dominant elements are Ca I, Ca II, Mg I, Mg II, Fe I, and Fe II. Temperature curve and bar graph were drawn to compare bone elements of group B which consumed lead with normal group, group A, in the same laboratory conditions. Plasma parameters including plasma temperature and electron density were determined by considering Local Thermodynamic Equilibrium (LTE) condition in the plasma. An inverse relationship has been detected between lead absorption and elements like Calcium and Magnesium absorption comparing elemental values for both the groups.

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