| 1. |
- Wang, Ling, et al.
(författare)
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Defect formation by order coalescence in vermicular grains during alumina phase transformation
- 2015
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Ingår i: Scripta Materialia. - : Elsevier BV. - 1359-6462 .- 1872-8456. ; 107, s. 59-62
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Tidskriftsartikel (refereegranskat)abstract
- Vermicular alpha-Al2O3 grains obtained from gamma- to alpha-phase transformation were investigated. X-ray diffraction patterns showed a left-shifting shoulder in all diffraction peaks of transformed alpha-Al2O3. High-resolution transmission electron microscopy results confirmed large amounts of defects inside the vermicular alpha-Al2O3 single-crystal. Combined with grain-growth discontinuity, the authors proposed that the defects inside vermicular grains resulted from assembly of nanosized alpha-crystallites by an ordered coalescence mechanism directly after phase transformation, by which the orientation alignment was thermodynamically favored in the solid-state sintering.
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| 2. |
- Wang, Ling, et al.
(författare)
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Intensive particle rearrangement in the early stage of spark plasma sintering process
- 2015
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Ingår i: Journal of Asian ceramic societies. - : Informa UK Limited. - 2187-0764. ; 3:2, s. 183-187
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Tidskriftsartikel (refereegranskat)abstract
- The densification behaviors of 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) ceramics during spark plasma sintering (SPS) were analyzed both using the master sintering curve (MSC) approach and by evaluating the temperature dependent evolution of density and densification rate. It was found that densification curves could hardly be fitted using one apparent activation energy value by MSC conception, by which it indicated that more than one densification mechanisms were involved in SPS. Moreover, dependent neither on applied pressure (20-100 MPa) nor heating rates higher than 50 degrees C/min, the maximum densification rate had always been observed at rather similar similar to 78% of theoretical density (TD) accompanied with negligible grain growth. An intensive particle rearrangement mechanism was proposed to dominate the rapid densification to 78% TD in early stage of SPS process, by which it yielded the considerable faster densification rate than those achievable by diffusion-related processes. (C) 2015 The Ceramic Society of Japan and the Korean Ceramic Society.
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| 3. |
- Sun, Yunhao, et al.
(författare)
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Accelerate the Electrolyte Perturbed-Chain Statistical Associating Fluid Theory-Density Functional Theory Calculation With the Chebyshev Pseudo-Spectral Collocation Method. Part II. Spherical Geometry and Anderson Mixing
- 2022
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Ingår i: Frontiers in Chemistry. - : Frontiers Media SA. - 2296-2646. ; 9
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Tidskriftsartikel (refereegranskat)abstract
- To improve the efficiency of electrolyte perturbed-chain statistical associatingfluidtheory–density functional theory (ePC-SAFT-DFT) calculation of the confined system, inthis work,first, the Chebyshev pseudo-spectral collocation method was extended to thespherical pores. Second, it was combined with the Anderson mixing algorithm toaccelerate the iterative process. The results show that the Anderson mixing algorithmcan reduce the computation time significantly. Finally, based on the accelerated ePC-SAFT-DFT program, a systematic study of the effects of the temperature, pressure, poresize, and pore shape on the CO2solubilities in the ionic liquids (ILs) confined inside the silicananopores was conducted. Based on the simulation results, to obtain high CO2solubilitiesin the ILs confined in silica, a better option is to use the silica material with a narrowspherical pore, and the IL-anion should be selected specifically considering that it has amore significant impact on the absorption enhancement effect.
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| 4. |
- Zhou, Hui-Ling, et al.
(författare)
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Optimal timing for carbon capture retrofitting in biomass-coal combined heat and power plants in China
- 2021
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Ingår i: Journal of Cleaner Production. - : ELSEVIER SCI LTD. - 0959-6526 .- 1879-1786. ; 293
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Tidskriftsartikel (refereegranskat)abstract
- Industrial decision-makers may wonder about the optimal timing for investing in carbon capture retrofitting in co-firing power plants, faced with uncertain benefits from upcoming China's carbon trading market and potential cost reductions derived from technology innovation. The decision on investment timing relates to the so-called waiting value, considering multiple uncertainties and trade-offs. This article applies a real options-based framework, adapted to deal with the waiting value in the context of multiple uncertainties of carbon market, technical improvements and biomass availability. The problem is solved through an efficient simulation method. The results suggest that the optimal retrofit timing for CCS (carbon capture and storage) in a co-firing CHP will be the year 2033 considering a basic scenario, in which the carbon price is 98 CNY/tonCO(2) (14.5 USS/tonCO(2)) in 2025, the growth rate and volatility are 5% and 7% respectively, and technical improvements are expected every six years and result in a cost reduction of 50%. In addition, we examine the effects of different sub-dimensions in the carbon market and technical improvement on anticipating the retrofit timing. The conclusions of this article provide decision-makers with strategies of adjusting the investment timing in response to their different expectations of market and technology developments. Further practical applications require judgments of future trends made by decision-makers and extensive data of specific cases.
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