The contribution of the present work is to develop a simple, yet efficient, capturing technique to be used with flapping wings during numerical simulation using Eulerian grids. The developed technique is based on the ...
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Using molecular dynamics we investigate the interaction of edge dislocations in helium-implanted tungsten with prior identified dominant defects of He-filled Frenkel pairs (He2V-SIA). Clusters of 3-10 He2V-SIA are see...
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The environmental problems of global warming and fossil fuel depletion are increasingly severe,and the demand for energy conversion and storage is *** issues such as global warming and fossil fuel depletion are increa...
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The environmental problems of global warming and fossil fuel depletion are increasingly severe,and the demand for energy conversion and storage is *** issues such as global warming and fossil fuel depletion are increasingly stringent,increasing energy conversion and storage *** rapid development of clean energy,such as solar energy,wind energy and hydrogen energy,is expected to be the key to solve the energy *** excellent literature works have highlighted quantum dots in supercapacitors,lithium-sulfur batteries,and photocatalytic hydrogen ***,we outline the latest achievements of quantum dots and their composites materials in those energy storage ***,we rationally analyze the shortcomings of quantum dots in energy storage and conversion,and predict the future development trend,challenges,and opportunities of quantum dots research.
The Obstacle Avoiding Rectilinear Steiner Minimum Tree (OARSMT) problem, which seeks the shortest interconnection of a given number of terminals in a rectilinear plane while avoiding obstacles, is a critical task in i...
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As the end-users increasingly can provide flexibility to the power system, it is important to consider how this flexibility can be activated as a resource for the grid. Electricity network tariffs is one option that c...
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As the end-users increasingly can provide flexibility to the power system, it is important to consider how this flexibility can be activated as a resource for the grid. Electricity network tariffs is one option that can be used to activate this flexibility. Therefore, by designing efficient grid tariffs, it might be possible to reduce the total costs in the power system by incentivizing a change in consumption patterns. This paper provides a methodology for optimal grid tariff design under decentralized decision-making and uncertainty in demand, power prices, and renewable generation. A bilevel model is formulated to adequately describe the interaction between the end-users and a distribution system operator. In addition, a centralized decision-making model is provided for benchmarking purposes. The bilevel model is reformulated as a mixed-integer linear problem solvable by branch-and-cut techniques. Results based on both deterministic and stochastic settings are presented and discussed. The findings suggest how electricity grid tariffs should be designed to provide an efficient price signal for reducing aggregate network peaks.
Closed fish farms address some critical issues in the aquaculture of salmon, where farms made of glass fibre are an interesting alternative to other material choices. To be competitive on cost when comparing to tradit...
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We propose a simple scheme to realize the persistent spin-nematic squeezing in a spinor Bose–Einstein condensate by rapidly turning-off the external magnetic field at a time that maximal spinnematic squeezing *** obs...
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We propose a simple scheme to realize the persistent spin-nematic squeezing in a spinor Bose–Einstein condensate by rapidly turning-off the external magnetic field at a time that maximal spinnematic squeezing *** observe that the optimal spin-nematic squeezing can be maintained in a nearly fixed *** a proper initial magnetic field,the optimal squeezing can be obviously *** further construct a spin-mixing interferometer,where the quantum correlation of the squeezed state(generated by our scheme)is fully utilized in the phase measurement,and show the phase sensitivity of the interferometer has a significant enhancement.
Dissipation and development of drops are the critical useful cycles of any shower burning peculiarities, the instrument of which is in a perfect world yet not completely perceived. For the present work, the steady sta...
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Oxygen vacancies play a key role in many energy-related applications, and the investigation of the thermodynamic forces driving their formation across different materials can be tackled through the use of ab initio me...
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Oxygen vacancies play a key role in many energy-related applications, and the investigation of the thermodynamic forces driving their formation across different materials can be tackled through the use of ab initio methods. In this context, however, computational studies targeting finite-temperature properties such as entropy remain scarce. Wider-ranging studies are of interest to deepen the understanding of the role of the entropy of oxygen vacancy formation and its different components in processes like the ones involved in solar thermochemical hydrogen (STCH) production, and to investigate the existence of common trends and differences between materials. In this work, we use density functional theory and harmonic phonon calculations to compute the vibrational entropy of oxygen vacancy formation (ΔSvib) for 10 different metal oxide compounds. The computation is carried out by taking the difference between the vibrational entropy of a vacancy-containing and a pristine structure, while the entropic contribution from the final gaseous state of the oxygen lost from the material is accounted for separately with a gas entropy term. We first examine the temperature dependence of ΔSvib and highlight the presence of an initial peak around room temperature, followed by a steady decrease resulting from the presence of an additional O atom (the one becoming vacant) in the defect-free structure. We then inspect the atomic contributions to ΔSvib, and highlight similarities and differences between compounds. Finally, we consider other significant sources of entropy, and find ΔSvib to provide a smaller, yet non-negligible, contribution to the total entropy of vacancy formation. We also compare the temperature dependence of ΔSvib to that of the gas entropy, and show that the two largely counterbalance each other at high temperatures.
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