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Статті в журналах з теми "Nuclear and plasma physics not elsewhere classified"
Sergeev, Fedor, Elena Bratkovskaya, Ivan Kisel, and Iouri Vassiliev. "Deep learning for quark–gluon plasma detection in the CBM experiment." International Journal of Modern Physics A 35, no. 33 (November 30, 2020): 2043002. http://dx.doi.org/10.1142/s0217751x20430022.
Повний текст джерелаRake, Christine, Clare Gilham, Martin Scholze, Laurette Bukasa, Jade Stephens, Jayne Simpson, Julian Peto, and Rhona Anderson. "British nuclear test veteran family trios for the study of genetic risk." Journal of Radiological Protection 42, no. 2 (June 1, 2022): 021528. http://dx.doi.org/10.1088/1361-6498/ac6e10.
Повний текст джерелаLück, Wolfgang. "The PHYS Database: A New Cooperation with AAA." International Astronomical Union Colloquium 110 (1989): 87–88. http://dx.doi.org/10.1017/s0252921100003018.
Повний текст джерелаNovoselov, I. Yu. "SYNTHESIS OF URANIUM-THORIUM OXIDE POWDERS IN LOW-TEMPERATURE PLASMA OF HIGH FREQUENCY TORCH DISCHARGE." Eurasian Physical Technical Journal 19, no. 1 (39) (March 28, 2022): 50–54. http://dx.doi.org/10.31489/2022no1/50-54.
Повний текст джерелаMustika, D., Torowati, Sudirman, A. Dimyati, A. Fisli, I. M. Joni, and R. Langenati. "Current Status of Purification of Indonesian Natural Graphite as a Candidate for Nuclear Fuel Matrix by Hydrometallurgy and Pyrometallurgy Methods." Journal of Physics: Conference Series 2048, no. 1 (October 1, 2021): 012021. http://dx.doi.org/10.1088/1742-6596/2048/1/012021.
Повний текст джерелаДисертації з теми "Nuclear and plasma physics not elsewhere classified"
(9643427), Troy A. Seberson. "Heating and Cooling Mechanisms for the Thermal Motion of an Optically Levitated Nanoparticle." Thesis, 2020.
Знайти повний текст джерелаBridging the gap between the classical and quantum regimes has consequences not only for fundamental tests of quantum theory, but for the relation between quantum mechanics and gravity. The field of levito-dynamics provides a promising platform for testing the hypotheses of the works investigating these ideas. By manipulating a macroscopic particle's motion to the scale of its ground state wavefunction, levito-dynamics offers insight into the macroscopic-quantum regime.
Ardent and promising research has brought the field of levito-dynamics to a state in which these tests are available. Recent work has brought a mesoscopic particle's motion to near the ground state. Several factors of decoherence are limiting efficient testing of these fundamental theories which implies the need for alternative strategies for achieving the same goal. This thesis is concerned with investigating alternative methods that may enable a mesoscopic particle to reach the quantum regime.
In this thesis, three theoretical proposals are studied as a means for a mesoscopic particle to reach the quantum regime as well as a detailed study into one of the most important factors of heating and decoherence for optical trapping. The first study of cooling a particle's motion highlights that the rotational degrees of freedom of a levitated symmetric-top particle leads to large harmonic frequencies compared to the translational motion, offering a more accessible ground state temperature after feedback cooling is applied. An analysis of a recent experiment under similar conditions is compared with the theoretical findings and found to be consistent.The second method of cooling takes advantage of the decades long knowledge of atom trapping and cooling. By coupling a spin-polarized, continuously Doppler cooled atomic gas to a magnetic nanoparticle through the dipole-dipole interaction, motional energy is able to be removed from the nanoparticle. Through this method, the particle is able to reach near its quantum ground state provided the atoms are at a temperature below the nanoparticle ground state temperature and the atom number is sufficiently large.The final investigation presents the dynamics of an optically levitated dielectric disk in a Gaussian standing wave. Though few studies have been performed on disks both theoretically and experimentally, our findings show that the stable couplings between the translational and rotational degrees of freedom offer a possibility for cooling several degrees of freedom simultaneously by actively cooling a single degree freedom.
(5930102), John P. Oliver. "Colliding Laser Produced Plasma Physics and Applications in Inertial Fusion and Nanolithography." Thesis, 2019.
Знайти повний текст джерела(9154730), Russell S. Brayfield. "ELECTRODE EFFECTS ON ELECTRON EMISSION AND GAS BREAKDOWN FROM NANO TO MICROSCALE." Thesis, 2020.
Знайти повний текст джерела(9179279), Shraddha Rane. "Quantitative Model of a Facility -Level Radiological Security Risk Index." Thesis, 2020.
Знайти повний текст джерела(6873689), Jungu Choi. "Toward measurement of Nuclear Spin-Dependent(NSD) Parity Non-Conserving (PNC) interaction in 133Cs hyperfine ground states via two-pathway coherent control." Thesis, 2019.
Знайти повний текст джерела(7478276), Vladlen Alexandrovich Podolsky. "INVESTIGATION OF PLASMAS SUSTAINED BY HIGH REPETITION RATE SHORT PULSES WITH APPLICATIONS TO LOW NOISE PLASMA ANTENNAS." Thesis, 2019.
Знайти повний текст джерелаIn the past two decades, great interest in weakly ionized plasmas sustained by high voltage nanosecond pulsed plasmas at high repetition rates has emerged. For such plasmas, the electron number density does not significantly decay between pulses, unlike the electron temperature. Such conditions are favorable to reconfigurable plasma antennas where the low electron temperature may enable the reduction of the Johnson–Nyquist thermal noise if an antenna is operated in the plasma afterglow. Moreover, it may be possible to sustain such conditions with RF pulses. Doing so could enable a plasma antenna that transmits the driving frequency when the pulse is applied and receives other frequencies with low thermal noise between pulses.
To study nanosecond pulsed plasmas, experiments were performed in a parallel-plate electrode configuration in argon and nitrogen gas at a pressure of several Torr and repetition frequencies of 30-75 kHz. To measure the time-resolved electron number density in the afterglow of each pulse, a custom 58.1 GHz homodyne microwave interferometer was constructed. The voltage and current measurements were made using a back current shunt (BCS). Initial analysis of the measured electron density in both plasmas indicated that the electron thermalization was much faster than the electron decay. In the nitrogen plasma, dissociative recombination with cluster ions was the dominant electron loss mechanism. However, the dissociative recombination rates of the electrons in the argon plasma suggested the presence of molecular impurities, such as water vapor. Therefore, to better understand the recombination mechanisms in argon plasma with trace amounts (0.1% or less by volume) of water vapor under the experimental conditions, a 0-D kinetic model was developed and fit to the experimental data. The influence of trace amounts of water on the electron temperature and density decay was studied by solving electron energy and continuity equations. It was found that in pure argon, Ar+ ions dominate while the electrons are very slow to thermalize and recombine. Including trace amounts of water impurities drastically reduces the time for electrons to thermalize and increases their rate of recombination.
In addition to large quasi-steady electron number densities and low electron temperature in the plasma afterglow, plasmas sustained by nanosecond pulses use a lower power budget than those sustained by RF or DC supplies. The efficiency of the power budget can be characterized by measuring the ionization cost per electron, defined as the ratio of the energy deposited in a pulse to the total number of electrons created. This was experimentally determined in air and argon plasmas at 2-10 Torr sustained by 1-7 kV nanosecond pulses at repetition frequencies of 0.1-30 kHz. The number of electrons were determined from the measured electron density through microwave interferometry and assuming a plasma volume equivalent to the volume between electrodes. The energy deposited was calculated from voltage and current measurements using both a BCS as well as high frequency resistive voltage divider and fast current transformer (FCT). It was found that the ionization cost in all conditions was within a factor of three of Stoletov’s point (the theoretical minimum ionization cost) and two orders of magnitude less than RF plasma.
Having shown that it is possible to
generate high electron density, low electron temperature plasmas with
nanosecond pulses, it was necessary to now create a plasma antenna prototype.
Initially, commercial fluorescent light bulbs were used and ignited using
surface wave excitation at various RF frequencies and powers. The S11
of the antenna response was measured by a VNA through a novel coupling circuit,
while the deposited power was measured using a bi-directional coupler. Next, a
custom plasma antenna was created in which the pressure and gas composition
could be varied. In addition to the S11 and deposited power, the
antenna gain, and the electron number density were also measured for a pure
argon plasma antenna at pressures of 0.3-1 Torr. Varying the applied power shifts
the antenna resonance frequency while increasing the excitation frequency
caused an increase in measured electron density for the same deposited power.
Initial tests using direct electrode excitation of a twin-tube integrated
compact fluorescent light bulb with nanosecond pulses have successfully been
achieved. Future efforts include designing the proper circuitry to time-gate
out the large pulse voltage to facilitate safe antenna measurements in the
plasma afterglow.