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Safety and risk analysis. Measurements of the purge helium pressure drop across pebble beds packed with lithium orthosilicate and glass pebbles. Abou-Sena, Ali, E-mail: ali. The pressure drop of the purge helium has a direct impact on the required pumping power and is a limiting factor for the purge mass flow. Therefore, the objective of this study is to measure the helium pressure drop across various HCPB-relevant pebble beds packed with lithium orthosilicate and glass pebbles.

The static pressure was measured at two locations mm apart along the pebble bed and at inlet and outlet of the pebble bed. The results demonstrated that: i the pressure drop significantly increases with decreasing the pebbles diameter, ii for the same superficial velocity, the pressure drop is directly proportional to the inlet pressure , and iii predictions of Ergun's equation agree well with the experimental results. The measured pressure drop for the lithium orthosilicate pebble bed will support the design of the purge gas system for the HCPB.

Back pressure helium leak testing of fuel elements for Dhruva research reactor. Atomic Fuels Div. Leak tightness specification on fuel elements for reactor use is always very stringent. The fuel element consists of natural metallic uranium rod around Since helium gas is not filled inside the fuel element while doing seal welding, the only way to do helium leak testing of such fuel rods is by back- pressure technique. This paper describes the development of test facility for carrying out such test and discusses the experiences of carrying out helium leak testing by back- pressure technique on more than numbers of fuel rods for Dhruva reactor.

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Three electrode atmospheric pressure plasma jet in helium flow. Plasma jets are widely used in various types of applications and lately more and more in the field of plasma medicine. However, it is not only their applicability that distinguishes them from other atmospheric plasma sources, but also the behavior of the plasma. It was shown that plasma plume is not continuous, but discrete set of plasma packages. Here we present iCCD images and current voltage characteristics of a three electrode plasma jet. Our plasma jet has a simple design with body made of glass tube and two transparent electrodes wrapped around it.

The additional third metal tip electrode was positioned at 10 and 25 mm in front of the jet nozzle and connected to the same potential as the powered electrode. Power transmitted to the plasma was from 0. Influence of the helium-pressure on diode-pumped alkali-vapor laser. Diode-pumped alkali-vapor laser DPAL is a kind of laser attracted much attention for its merits, such as high quantum efficiency, excellent beam quality, favorable thermal management, and potential scalability to high power and so on.

With the increase of helium pressure , the numerical results show that: 1 the absorption line-width increases and the stimulated absorption cross-section decreases contrarily; 2 the threshold pumping power decreases to minimum and then rolls over to increase linearly; 3 the absorption efficiency rises to maximum initially due to enough large stimulated absorption cross-section in the far wings of collisionally broadened D2 transition absorption transition , and then begins to reduce; 4 an optimal value of helium pressure exists to obtain the highest output power, leading to an optimal optical-optical efficiency.

Furthermore, to generate the self-oscillation of laser, a critical value of helium pressure occurs when small-signal gain equals to the threshold gain. Temperature measurement in the liquid helium range at pressure. To this aim, the thermometer resistance as a function of temperature and pressure is measured. It is revealed that pressure does not change the thermometric response of the bronze resistance thermometer but only shifts it to the region of lower temperatures.

The identical investigations of the germanium resistance thermometer shows that strong temperature dependence and the shift of its thermometric response under the influence of pressure make the use of germanium resistance thermometers in high- pressure chambers very inconvenient.

It permits to use this thermocouple for temperature measurements at high pressures. Gaseous Matter. This new, full-color resource describes the basic characteristics and properties of several important gases, including air, hydrogen, helium , oxygen, and nitrogen. The nature and scope of the science of fluids is discussed in great detail, highlighting the most important scientific principles upon which the field is based. Chapters include:. Gaseous Matter An Initial Perspective. Physical Characteristics of Gases. The Rise of the Science of Gases. Kinetic Theory of.

Sound velocity and equation-of-state measurements in high pressure fluid and solid helium. A piston--cylinder apparatus was used to obtain P, V, T, and simultaneous values of longitudinal sound velocity in helium fluid throughout the ranges 75 to 0 K and 3 to 20 kbar. Some data sets were obtained for the fluid and used in a double-process least-squares fit to an equation of state of the Benedict type.

Additional measurements extended across the melting line into the solid phase at pressures up to 18 kbar. Measurements of the compressibility are compared with those obtained by Stewart along the 4 0 K isotherm up to 20 kbar. We discuss the use of helium as a pressure medium in high- pressure diamond anvil cells.

Essentially no data are given. Hydrogen and helium under high pressure : a case for a classical theory of dense matter. When subject to high pressure , H 2 and 3 He are expected to undergo phase transitions, and to become metallic at a sufficiently high pressure. In hydrogen, metallisation occurs at 3. A phase transition occurs in helium at These values are close to the results obtainable by more rigorous methods. Possibilities of experimental verification of the calculations are briefly discussed.

Effects of cyclic mean pressure of helium gas on performance of integral crank driven stirling cryocooler. An integral crank driven Stirling cryocooler is solidly based on concepts of direct IR detector mounting on the cryocooler's cold finger, and the integral construction of the cryocooler and Dewar envelope. Performance factors of the cryocooler depend on operating conditions of the cryocooler such as a cyclic mean pressure of the working fluid, a rotational speed of driving mechanism, a thermal environment, a targeted operation temperature and etc..

At given charging condition of helium gas, the cyclic mean pressure of helium gas in the cryocooler changes with temperatures of the cold end and the environment. In this study, effects of the cyclic mean pressure of helium gas on performances of the Stirling cryocooler were investigated by numerical analyses using the Sage software. The simulation model takes into account thermodynamic losses due to an inefficiency of regenerator, a pressure drop, a shuttle heat transfer and solid conductions.

Simulations are performed for the performance variation according to the cyclic mean pressure induced by the temperature of the cold end and the environment. This paper presents P-V works in the compression and expansion space, cooling capacity, contribution of losses in the expansion space. Atmospheric pressure helium afterglow discharge detector for gas chromatography. An apparatus for providing a simple, low-frequency electrodeless discharge system for atmospheric pressure afterglow generation. A single quartz tube through which a gas mixture is passed is extended beyond a concentric electrode positioned thereabout.

A grounding rod is placed directly above the tube outlet to permit optical viewing of the discharge between the electrodes. High-resolution thermal expansion measurements under helium -gas pressure. We report on the realization of a capacitive dilatometer, designed for high-resolution measurements of length changes of a material for temperatures 1. Helium 4He is used as a pressure -transmitting medium, ensuring hydrostatic- pressure conditions. Special emphasis has been given to guarantee, to a good approximation, constant- pressure conditions during temperature sweeps.

The results indicate a strong effect of pressure on the magnetic interactions in this system.

Superfluid helium

A prestressed concrete pressure vessel for helium high temperature reactor system. A novel prestressed concrete pressure vessel has been developed to provide the primary containment for a fully integrated system comprising a high temperature nuclear reactor, three horizontally mounted helium turbines, associated heat exchangers and inter-connecting ducts. The design and analysis of the pressure vessel is described. Factors affecting the final choice of layout are discussed, and earlier development work seeking to resolve the conflicting requirements of the structural, mechanical, and system engineers outlined.

Proposals to increase the present output of about MW of electrical power to over MW, by incorporating four turbines in a single pressure vessel are presented. Exergoeconomic optimization of coaxial tube evaporators for cooling of high pressure gaseous hydrogen during vehicle fuelling. Gaseous hydrogen as an automotive fuel is reaching the point of commercial introduction. Development of hydrogen fuelling stations considering an acceptable fuelling time by cooling the hydrogen to C has started.

This paper presents a design study of coaxial tube ammonia evaporators for three The main contribution to the exergy destruction was found to be thermally driven. Lattice dynamics of fcc helium at high pressure. The neutron-inelastic-scattering technique was used to measure the phonon dispersion relations in a high-density crystal of fcc He at 38 K. The crystal was grown at a pressure of 4. Its lattice parameter was determined to be 3. The measured dispersion curves were found to be in good agreement with a recent calculation by Goldman using the first-order self-consistent phonon theory without short-range correlation functions.

The magnitude of the multiphonon interference effects on the one-phonon intensities is shown to be less than half of that observed in the low-density crystals. The dependence of the phonon energies on volume is discussed with reference to the earlier work of Traylor et al.

Limited measurements were also made at 22 K to determine the temperature dependence of the phonon energies. Some characteristics of the digitization pulses from high pressure neon- helium flash tubes. Characteristics of the digitization output pulses from high pressure neon- helium flash tubes were studied under various operation conditions using square ultra-high voltage pulses. Properties reported by previous workers were compared. Two discharge mechanisms, the Townsend avalanche discharge and the streamer discharge, were observed to occur in sequence in some events.

The output waveforms for both discharge mechanisms were studied in detail. The charge induced on a detecting probe was also estimated from the measured data. Cathode fall parameters of a self-sustained normal glow discharge in atmospheric- pressure helium. Results from comprehensive studies of a high-current self-sustained glow discharge in atmospheric- pressure helium are presented. The main parameters of the cathode fall, namely, the electric field profile, cathode fall thickness, current density, gas temperature, and heat flux to the cathode are determined.

The results obtained are discussed using one-dimensional models of the cathode fall with allowance for volumetric heat release. Mass spectrometric diagnosis of an atmospheric pressure helium microplasma jet.

It is shown from time-averaged ion intensities that reducing the width of the jet capillary results in a significant increase in the variety of both positive and negative ions detected within the discharge. We discuss this in terms of changes in flow velocity and the onset of turbulence within the plasma plume. Changing the mode of excitation had little effect on the ionic species detected from the microplasma jet; however, there was a notable shift in dominance towards higher mass ions when operated in a continuous wave kHz mode.

Positive ions were created during periods correlated with the positive and negative peaks in discharge current, while negative ions were predominantly created at times when the discharge current peak was negative. This phenomenon was independent of the driving waveform. For pulsed dc excitation, considerably fewer positive ions were created in periods related to the negative current peaks, especially at higher frequencies. We propose a simple explanation for these processes based on ideas of streamer propagation and the influence of self-induced electric fields in the plasma plume. Helium atmospheric pressure plasma jets touching dielectric and metal surfaces.

Atmospheric pressure plasma jets APPJs are being investigated in the context plasma medicine and biotechnology applications, and surface functionalization. The composition of the surface being treated ranges from plastics, liquids, and biological tissue, to metals. The dielectric constant of these materials ranges from as low as 1.

The electrical properties of the surface are not independent variables as the permittivity of the material being treated has an effect on the dynamics of the incident APPJ. In this paper, results are discussed from a computational investigation of the interaction of an APPJ incident onto materials of varying permittivity, and their impact on the discharge dynamics of the plasma jet. The computer model used in this investigation solves Poisson's equation, transport equations for charged and neutral species, the electron energy equation, and the Navier-Stokes equations for the neutral gas flow.

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Low values of relative permittivity encourage propagation of the electric field into the treated material and formation and propagation of a surface ionization wave. High values of relative permittivity promote the restrike of the ionization wave and the formation of a conduction channel between the plasma discharge and the treated surface. The distribution of space charge surrounding the APPJ is discussed. The installation of helium auxiliary systems in HTGR. The inert gas Helium was chosen as reactor coolant in high temperature gas coolant reactor, therefore a set of Special and uncomplex helium auxiliary systems will be installed, the safe operation of HTR can be safeguarded.

It does not effect the inherent safety of HTR MW if any one of all those systems were damaged during operation condition. This article introduces the design function and the system principle of all helium auxiliary systems to be installed in HTR Those systems include: helium purification and its regeneration system, helium supply and storage system, pressure control and release system of primary system, dump system for helium auxiliary system and fuel handling, gaseous waste storage system, water extraction system for helium auxiliary systems and evacuation system for primary system.

High-power laser-metal interactions in pressurized gaseous atmospheres. Bitelli, G. Innovazione; Lugomer, S. In the above conditions some new effects were observed. The laser-material interaction occurred in a highly absorptive plasma regime, meaning that the metal surface was effectively screened from the beam. The metal surface properties were studied by means of optical analysis, microhardness tests, X-ray diffraction and Raman backscattering.

Effect of helium pressure on the response of unirradiated UO2 subjected to thermal transients. The effect of helium pressure on the transient response of unirradiated depleted UO 2 subjected to simulated hypothetical loss-of-flow accidents in a gas-cooled fast reactor was examined by use of the direct electrical heating technique.

Transient tests were performed at pressures ranging from 7 to 10 X 10 5 Pa 7 to 10 atm to 7 to 8 MPa 70 to 80 atm on radially restrained and unrestrained fuel segments. The results indicate that while the mechanical integrity of the fuel segment was independent of the test pressure , the rapid ejection of molten fuel from pellet interfaces of unrestrained fuel, observed at the lower pressures , was delayed or suppressed at the higher pressures.

Columnar discharge mode between parallel dielectric barrier electrodes in atmospheric pressure helium. Using a fast-gated intensified charge-coupled device, end- and side-view photographs were taken of columnar discharge between parallel dielectric barrier electrodes in atmospheric pressure helium. Based on three-dimensional images generated from end-view photographs, the number of discharge columns increased, whereas the diameter of each column decreased as the applied voltage was increased.

Side-view photographs indicate that columnar discharges exhibited a mode transition ranging from Townsend to glow discharges generated by the same discharge physics as atmospheric pressure glow discharge.


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Performance characterization of the FLEX low pressure helium facility for fusion technology experiments. Because of its versatility it offers a wide range of further applications, e. The main parameters of the loop, which can be operated with inert gases and air are: i operation gas pressure 0.

This paper gives a detailed view of the loop assembly with the components that generate and regulate the mass flow and loop pressure. The measurement instrumentation will be presented as well as a representative mass flow- pressure drop characteristic. Furthermore, the achievable gas purity will be discussed. These experiments carry sensors cooled to liquid helium temperatures. The liquid helium supply is contained in large i. Should the dewar vacuum insulation fail, the inrushing air will condense and freeze on the dewar wall, resulting in a large heat flux on the dewar's contents.

The heat flux results in a rise in pressure and the actuation of the dewar pressure relief system. A previous NASA Engineering and Safety Center NESC assessment provided recommendations for the wall heat flux that would be expected from a loss of vacuum and detailed an appropriate method to use in calculating the maximum pressure that would occur in a loss of vacuum event. The method would allow the university-based science instrument development teams to conservatively determine the cryostat's vent neck sizing during preliminary design of new SOFIA Science Instruments.

This report details the development of the simplified method, the method itself, and the limits of its applicability. The simplified methodology provides an estimate of the dewar pressure after a loss of vacuum insulation that can be used for the initial design of the liquid helium dewar vent stacks. However, since it is not an exact. Disruption mitigation with high- pressure helium gas injection on EAST tokamak. Chen, D. High pressure noble gas injection is a promising technique to mitigate the effect of disruptions in tokamaks.

In this paper, results of mitigation experiments with low-Z massive gas injection helium on the EAST tokamak are reported. Different amounts of helium gas were injected into stable plasmas in the preliminary experiments. The mitigation result is that the current quench time and vertical displacement can both be reduced significantly, without resulting in significantly higher loop voltage.


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This also reduces the risk of runaway electron generation. In addition, the impurity gas jet has also been injected into VDEs, which are more challenging to mitigate that stable plasmas. Study of the high- pressure helium phase diagram using molecular dynamics. The rich occurrence of helium and hydrogen in space makes their properties highly interesting.

By means of molecular dynamics MD , we have examined two interatomic potentials for 4 He. Both potentials are demonstrated to reproduce high- pressure solid and liquid equation of state EOS data. The EOS, solid-solid transitions and melting at high pressures P were studied using a two-phase method.

The Buckingham potential shows a good agreement with theoretical and experimental EOS, but does not reproduce experimental melting data. The Aziz potential shows a perfect match with theoretical melting data. We conclude that there is a stable body-centred-cubic bcc phase for 4 He at temperatures T above K and pressures above 22 GPa for the Buckingham potential, whereas no bcc phase is found for the Aziz potential in the applied PT range. Helium pressures in RHIC vacuum cryostats and relief valve requirements from magnet cooling line failure. A catastrophic failure of the RHIC magnet cooling lines, similar to the LHC superconducting bus failure incident, would pressurize the insulating vacuum in the magnet and transfer line cryostats.

Insufficient relief valves on the cryostats could cause a structural failure. Arc flash energy deposition and heat load from the ambient temperature cryostat surfaces were included in the simulations. Existing relief valve sizes were reviewed to make sure that the maximum stresses, caused by the calculated maximum pressures inside the cryostats, did not exceed the allowable stresses, based on the ASME Code B Modeling the dynamic response of pressures in a distributed helium refrigeration system.

A mathematical model is created of the dynamic response of pressures caused by flow inputs to an existing distributed helium refrigeration system. The dynamic system studied consists of the suction and discharge pressure headers and compressor portions of the refrigeration system used to cool the superconducting magnets of the Tevatron accelerator at the Fermi National Accelerator Laboratory. The modeling method involves identifying the system from data recorded during a series of controlled tests, with effort made to detect locational differences in pressure response around the four mile accelerator circumference.

A review of the fluid mechanics associated with the system indicates linear time invariant models are suitable for the identification, particularly since the governing equations of one dimensional fluid flow are approximated by linear differential equations. An outline of the experimental design and the data acquisition system are given, followed by a detailed description of the modeling, which utilized the Matlab programming language and associated System Identification Toolbox.

Two representations of the system are presented.

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One, a black box model, provides a multi-input, multi-output description assembled from the results of single input step function testing. This description indicates definite variation in pressure response with distance from the flow input location, and also suggests subtle differences in response with the input location itself.

A second system representation is proposed which details the relation between continuous flow changes and pressure response, and provides explanation of a previously unappreciated pressure feedback internal to the system. A one-dimensional self-consistent fluid model was developed for radio frequency glow discharge in helium at near atmospheric pressure , and was employed to study the gas breakdown characteristics in terms of breakdown voltage.

The effective secondary electron emission coefficient and the effective electric field for ions were demonstrated to be important for determining the breakdown voltage of radio frequency glow discharge at near atmospheric pressure. The reduction in the breakdown voltage of radio frequency glow discharge with excitation frequency was studied and attributed to the electron trapping effect in the discharge gap.

Void nucleation by the helium atoms during lifetime of reactor pressure vessel. Void formation and growth has a great influence on the reactor pressure vessel steels during its lifetime and during post-irradiation annealing to increase its life. The present investigation aimed at the fact that if one can prevent void nucleation, accordingly one would not wary about void formation and growth. From that concept a model for helium production by transmutation reaction and corresponding swelling under irradiation conditions for several number of steels have been developed.

This was done for recommending a steel type that can oppose such a phenomena. In the same time the present investigation gives a procedure utilizing such phenomena for checking the validity of pressure vessel steel used in the NPP. The cryogenic system will provide stable operation and full automatic control. A three- pressure helium cycle composed of six turbines has been customised design for this project.

The '' design '' operating mode results with a system composed of a 9 kW refrigerator including safety margin and using gas and liquid storages for mass balancing. A thermal damper is used to smooth these variations and will allow stable operation. This paper presents a design study of coaxial tube ammonia evaporators for three different concepts of hydrogen cooling, one one-stage and two two-stage processes.

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An exergoeconomic optimization is imposed to all three concepts to minimize the total cost. A numerical heat transfer model is developed in Engineer Equation Solver, using heat transfer and pressure drop correlations from the open literature. With this model the optimal choice of tube sizes and circuit numbers are found for all three concepts. Fourier transform infrared absorption spectroscopy characterization of gaseous atmospheric pressure plasmas with 2 mm spatial resolution. Laroche, G. This paper describes an optical setup built to record Fourier transform infrared FTIR absorption spectra in an atmospheric pressure plasma with a spatial resolution of 2 mm.

The overall system consisted of three basic parts: 1 optical components located within the FTIR sample compartment, making it possible to define the size of the infrared beam 2 mm Multiplication-Sign 2 mm over a path length of 50 mm imaged at the site of the plasma by 2 an optical interface positioned between the spectrometer and the plasma reactor. Once through the plasma region, 3 a retro-reflector module, located behind the plasma reactor, redirected the infrared beam coincident to the incident path up to a 45 Degree-Sign beamsplitter to reflect the beam toward a narrow-band mercury-cadmium-telluride detector.

The antireflective plasma-coating experiments performed with ammonia and silane demonstrated that it was possible to quantify 42 and 2 ppm of these species in argon, respectively. In the case of ammonia, this was approximately three times less than this gas concentration typically used in plasma coating experiments while the silane limit of quantification was 35 times lower. The possibility of reaching this spatial resolution thus enabled us to measure the gaseous precursor consumption as a function of their residence time in the plasma. Propagation of atmospheric pressure helium plasma jet into ambient air at laminar gas flow.

The formation of an atmospheric pressure plasma jet APPJ in a gas flow passing through the discharge gap depends on both gas-dynamic properties and electrophysical parameters of the plasma jet generator. The paper presents the results of experimental and numerical study of the propagation of the APPJ in a laminar flow of helium. A dielectric-barrier discharge DBD generated inside a quartz tube equipped with a coaxial electrode system, which provided gas passing through it, served as a plasma source. The transition of the laminar regime of gas flow into turbulent one was controlled by the photography of a formed plasma jet.

The corresponding gas outlet velocity and Reynolds numbers were revealed experimentally and were used to simulate gas dynamics with OpenFOAM software. The data of the numerical simulation suggest that the length of plasma jet at the unvarying electrophysical parameters of DBD strongly depends on the mole fraction of ambient air in a helium flow, which is established along the direction of gas flow. Correlation of Helium Solubility in Liquid Nitrogen. A correlation has been developed for the equilibrium mole fraction of soluble gaseous helium in liquid nitrogen as a function of temperature and pressure.

Data from six sources was used to develop a correlation within the range of 0. The relative standard deviation of the correlation is 6. Measurements of the electrical conductivity and the absolute intensity of the light emission were made. The effective recombination rate coefficient was found to increase faster than linearly with gas pressure.

The total photon emission rate was significantly lower than the effective recombination rate. Absorption measurements of the atomic metastable concentration gave evidence for recombination directly into the 23 S state. The concentration of molecular metastables was surprisingly low. Absorption measurements of the atomic metastable concentration gave evidence for recombination directly into the 2 3 S state. In-flow species concentration measurements in reacting flows at high pressures are needed both to improve the current understanding of the physical processes taking place and to validate predictive tools that are under development, for application to the design and optimization of a range of power plants from diesel to rocket engines.

To date, non intrusive measurements have been based on calibrations determined from assumptions that were not sufficiently quantified to provide a clear understanding of the range of uncertainty associated with these measurements. The purpose of this work is to quantify the uncertainties associated with OH measurement in a oxygen-hydrogen system produced by a shear, coaxial injector typical of those used in rocket engines. This study has evaluated the uncertainties associated with OH measurement at 10, 27, 37 and 53 bar respectively.

International Thermodynamic Tables of the Fluid State Helium-4

Studies on MHD pressure drop and heat transfer of helium -lithium annular-mist flow in a transverse magnetic field. Pressure drop and heat transfer coefficient of helium -lithium annular-mist flow in a rectangular duct were investigated experimentally under a transverse magnetic field at system pressure of 0. A ratio of MHD pressure drop to that of non-magnetic field increases with magnetic flux density and a mass flow rate ratio of lithium to helium in low helium velocity region.

However, as increasing the helium velocity, the increment of MHD pressure drop with the magnetic flux density is much reduced and then becomes almost zero. At this condition, the MHD pressure drop of the annular-mist flow becomes much smaller than that of lithium single phase flow with the same lithium mass flow at the high magnetic flux density. Heat transfer coefficient ratio of the helium -lithium annular-mist flow to helium single phase in the non-magnetic field is well correlated by a ratio of the mass flow rate of lithium to helium.

The heat transfer coefficient in the magnetic field increases with the magnetic flux density and then terminates at a certain value depending on the mass flow rate ratio and the helium velocity. These characteristics of the MHD pressure drop and the heat transfer in the magnetic field suggest that the helium -lithium annular-mist flow is effectively applicable to cooling of the high heat flux wall in a strong magnetic field like a first wall of a magnetic confinement fusion reactors.

This dissertation explores the non-Doppler shifting of Helium lines in the high pressure conditions of a white dwarf photosphere. In particular, this dissertation seeks to mathematically quantify the shift in a way that is simple to reproduce and account for in future studies without requiring prior knowledge of the star's bulk properties mass, radius, temperature, etc. Two main methods will be used in this analysis. Hartshorn, and Alan T. Cambridge: RSC Publishing, Cox, P. Oxford: Oxford University Press, Croswell, Ken.

The Alchemy of the Heavens. New York: Anchor Books, Emsley, John. Enss, Christian, and Siegfried Hunklinger. Low-Temperature Physics. Firestone, Richard B. Edited by Virginia S.

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Shirley, with assistant editors Coral M. Baglin, S. Frank Chu, and Jean Zipkin. Ghosh, Dulal C. Griffiths, David J. Gwyn Williams. Electron Binding Energies. Ho, C. Powell, and P. Huheey, James E. Keiter, and Richard L Keiter. International Chemical Safety Card for Helium. Jensen, William B. King, H. Kittel, Charles. Liboff, Richard L. Lide, David R. Mann, Joseph B. Meek, and Leland C.

Manuel, O.