“…These assignments are supported by previous work. 70 The predicted frequencies are also in excellent agreement with INS measurements collected at 273 K, with an average 6% and maximum 13% difference. The discrepancies may in part be attributed to the neglect of temperature effects (i.e.…”
Section: Phonon Dispersion and Phonon Density Of Statessupporting
confidence: 72%
“…12 Park et al also found that the balance of the thermal transport shis towards higherfrequency modes with shorter wavelengths at elevated temperature, resulting in reduced thermal transport. 73 While the phonon spectrum of stoichiometric ThO 2 is well documented in the literature, [20][21][22][23][24]70 this is the rst study to explore the impact of defects. The phonon dispersions of the defective structures, obtained in terms of the ThO 2 primitive cell using band unfolding, 35,36 are shown together with the calculated PDOS in Fig.…”
Section: Phonon Dispersion and Phonon Density Of Statesmentioning
confidence: 99%
“…The thermal conductivity of ThO 2 is well studied in the literature using DFT 23,24,70 and other theoretical ). Given the scatter in the experiments, we suspect our prediction overestimates the measurements because it is difficult to prepare high-quality bulk samples that are free from defects such as grain boundariesthese defects limit the transport through modes with long mean free paths and thus reduce the overall k latt .…”
Thorium dioxide (ThO2) is a promising alternative to mixed-oxide nuclear fuels due to its longer fuel cycle and resistance to proliferation. Understanding the thermal properties, in particular the thermal conductivity,...
“…These assignments are supported by previous work. 70 The predicted frequencies are also in excellent agreement with INS measurements collected at 273 K, with an average 6% and maximum 13% difference. The discrepancies may in part be attributed to the neglect of temperature effects (i.e.…”
Section: Phonon Dispersion and Phonon Density Of Statessupporting
confidence: 72%
“…12 Park et al also found that the balance of the thermal transport shis towards higherfrequency modes with shorter wavelengths at elevated temperature, resulting in reduced thermal transport. 73 While the phonon spectrum of stoichiometric ThO 2 is well documented in the literature, [20][21][22][23][24]70 this is the rst study to explore the impact of defects. The phonon dispersions of the defective structures, obtained in terms of the ThO 2 primitive cell using band unfolding, 35,36 are shown together with the calculated PDOS in Fig.…”
Section: Phonon Dispersion and Phonon Density Of Statesmentioning
confidence: 99%
“…The thermal conductivity of ThO 2 is well studied in the literature using DFT 23,24,70 and other theoretical ). Given the scatter in the experiments, we suspect our prediction overestimates the measurements because it is difficult to prepare high-quality bulk samples that are free from defects such as grain boundariesthese defects limit the transport through modes with long mean free paths and thus reduce the overall k latt .…”
Thorium dioxide (ThO2) is a promising alternative to mixed-oxide nuclear fuels due to its longer fuel cycle and resistance to proliferation. Understanding the thermal properties, in particular the thermal conductivity,...
“…Literature about thermal conductivity data for the monoclinic α-ThC 2 is very scarce but, as pointed out by Manara et al 23 , an estimated value is 24 W/(m K) obtained from electrical resistivity measurements for fully dense ThC 2 at 298 K, whereas experimental data for a 72% ρ th (theroretical density) sample yield 24 W/(m K) at 443 K and 20.5 W/(m K) at 627 K. On the other hand, Pillai and Malakkal 25 , 26 reported much lower values for the thermal conductivity of 94% ρ th and 95% ρ th ThC 2 samples in the 300–1200 K temperature range. In particular, around 600 K the ThO 2 thermal conductivity is found to be around 7 25 or 8 26 W/(m K), less than half the value reported for a 72% ρ th ThC 2 23 . Figure 10 Thermal diffusivity of ThCx–GO and ThCx–graphite.…”
Thorium carbide to be tested as target material for the production of 225Ac with the ISOL method, was produced via carbothermal reduction of ThO2 nanoparticles by graphite and graphene oxide, respectively. The use of graphene oxide (GO) as carbon source resulted in a reduced reactivity compared to graphite, confirmed by the presence of unreacted ThO2 mainly in the core of the samples. The reacted ThO2 or ThC2–GO showed a faster reactivity in air, mainly observed as ThC2 amorphization. The specific surface area of the ThC2–GO samples was almost doubled compared to ThC2–graphite samples. The effect of these microstructural features was analysed in terms of thermal diffusivity and calculated thermal conductivity that were both reduced in ThC2–GO samples, however the difference with ThC2–graphite samples decreased at increasing temperature. The present study shows that the use of unreduced GO inhibits the solid-state reaction between ThO2 and C; on the other hand, the high reactivity of the ThC2 so produced is expected to be beneficial for the 225Ac production with the ISOL method, affording a high release efficiency. It is expected that the use of reduced GO could represent a good solution for highly efficient ThC2 targets.
“…When the E value is small when the operating point is close to the maximum power point, the fuzzy controller outputs a smaller step size to improve the accuracy at steady state. When the distance from the maximum power point is large, the E value is larger, and the fuzzy controller outputs a larger step size to achieve the tracking of the maximum power point [29].…”
This study introduces a supercapacitor hybrid energy storage system in a wind-solar hybrid power generation system, which can remarkably increase the energy storage capacity and output power of the system. In the specific solution, this study combines the distributed power generation system and the hybrid energy storage system, while using the static reactive power compensation system and the conductance-fuzzy dual-mode control method to increase output power in stages. At the same time, the optimal configuration model of the wind-solar hybrid power generation system is established using MATLAB/Simulink software. The output power of the microgrid to the wind-photovoltaic hybrid power generation system is calculated by simulation, and the optimization process of each component of the system is simulated. This study mainly uses the static reactive power compensation system and the conductance-fuzzy dual-mode control method to optimize the wind-solar hybrid power generation system. Using MATLAB software simulation verifies the feasibility and rationality of the optimal configuration of the system.
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