This study developed a symbiotic dual-confinement strategy integrating interstitial oxygen doping and carbon coating to enhance high-entropy alloys for high-current-density zinc-air batteries.Through the combination o...This study developed a symbiotic dual-confinement strategy integrating interstitial oxygen doping and carbon coating to enhance high-entropy alloys for high-current-density zinc-air batteries.Through the combination of theoretical cluster models with the experimental synthesis of MnFeCoNiCu@C high-entropy alloys,the synergistic suppression of demetalization and kinetic optimization was investigated.The dual-confined high-entropy alloys exhibited no significant attenuation for 1600 h in zinc-air batteries and resisted large current of 100 mA cm^(-2)impacts,with density functional theory calculations confirming lower d-band centers and higher formation energies,correlating with enhanced durability and reaction kinetics.展开更多
The mechanism and regioselectivity of 1,3-dipolar cycloaddition of N-[methyl]-C-[5-nitro-2-furyl] nitrilimine with dimethyl 7-oxabicyclo[2,2,1]hepta-2,5-diene-2,3-dicarboxylate were investigated using activation energ...The mechanism and regioselectivity of 1,3-dipolar cycloaddition of N-[methyl]-C-[5-nitro-2-furyl] nitrilimine with dimethyl 7-oxabicyclo[2,2,1]hepta-2,5-diene-2,3-dicarboxylate were investigated using activation energy calculations and density functional theory-based reactivity indexes. The reaction proceeds by an asynchronous concerted mechanism. The calculations are performed at the B3LYP/6-31G（d） level of theory and the obtained results are in agreement with experimental outcome.展开更多
The discrete Fourier transform （DFT）-based codebook is employed in this paper to quantize channel state information so that the amount of feedback can be reduced in the multiple input multiple output （MIMO） downli...The discrete Fourier transform （DFT）-based codebook is employed in this paper to quantize channel state information so that the amount of feedback can be reduced in the multiple input multiple output （MIMO） downlink of long term evolution （LTE） system. And a novel beamforming （BF） scheme based on the proposed channel quality-to-interference （QIR） quantizing criteria is developed, which uses only the index of the optimal codebook for the beamforming at the base station （BS）, and dramatically reduces the amount of feedback. The proposed BF scheme jointly considers the influences of the quality of the quantized channels and the mutual interference among the sub-channels. The extensive simulation results verify that throughput of the proposed BF scheme is better than that of the random BF with a little feedback, and that of the eigen-beamforming even under low signal noise ratio （SNR） scenario.展开更多
基金financial support provided by the National Natural Science Foundation of Yunnan Province(202301AS070040)Major Science and Technology Projects of Yunnan Province(202302AB080019-3)。
文摘This study developed a symbiotic dual-confinement strategy integrating interstitial oxygen doping and carbon coating to enhance high-entropy alloys for high-current-density zinc-air batteries.Through the combination of theoretical cluster models with the experimental synthesis of MnFeCoNiCu@C high-entropy alloys,the synergistic suppression of demetalization and kinetic optimization was investigated.The dual-confined high-entropy alloys exhibited no significant attenuation for 1600 h in zinc-air batteries and resisted large current of 100 mA cm^(-2)impacts,with density functional theory calculations confirming lower d-band centers and higher formation energies,correlating with enhanced durability and reaction kinetics.
文摘The mechanism and regioselectivity of 1,3-dipolar cycloaddition of N-[methyl]-C-[5-nitro-2-furyl] nitrilimine with dimethyl 7-oxabicyclo[2,2,1]hepta-2,5-diene-2,3-dicarboxylate were investigated using activation energy calculations and density functional theory-based reactivity indexes. The reaction proceeds by an asynchronous concerted mechanism. The calculations are performed at the B3LYP/6-31G（d） level of theory and the obtained results are in agreement with experimental outcome.
基金supported by the Program for New Century Excellent Talents in University (NCET-08-0891)the Research Fund for the Doctoral Program of Higher Education of China(20070532077)the Natural Science Foundation of Shaanxi Province (2010JQ80241, 1090275)
文摘The discrete Fourier transform （DFT）-based codebook is employed in this paper to quantize channel state information so that the amount of feedback can be reduced in the multiple input multiple output （MIMO） downlink of long term evolution （LTE） system. And a novel beamforming （BF） scheme based on the proposed channel quality-to-interference （QIR） quantizing criteria is developed, which uses only the index of the optimal codebook for the beamforming at the base station （BS）, and dramatically reduces the amount of feedback. The proposed BF scheme jointly considers the influences of the quality of the quantized channels and the mutual interference among the sub-channels. The extensive simulation results verify that throughput of the proposed BF scheme is better than that of the random BF with a little feedback, and that of the eigen-beamforming even under low signal noise ratio （SNR） scenario.
