The compound NdFe 0.6 Sb 2 was studied by means of X ray powder diffraction. The X ray powder diffraction data and structural parameters demonstrated that this compound is of the tetragonal structure with space...The compound NdFe 0.6 Sb 2 was studied by means of X ray powder diffraction. The X ray powder diffraction data and structural parameters demonstrated that this compound is of the tetragonal structure with space group P4/nmm, Z =2 and D x=7.615 g·cm -3 . The lattice parameters are a =0.43499 (1) nm and c =0.97083 (4) nm. Refinement was performed with 42 reflections.展开更多
Mg-doped Sb3Te films are proposed to improve the performance of phase-change memory （PCM）. We prepare Mg- doped Sb3Te films and investigate their crystallization behaviors, structural, optical and electrical propert...Mg-doped Sb3Te films are proposed to improve the performance of phase-change memory （PCM）. We prepare Mg- doped Sb3Te films and investigate their crystallization behaviors, structural, optical and electrical properties. We find that Mg-doping can increase the crystallization temperature, enhance the activation energy, and improve the 10-year data retention of Sb3Te. Especially Mg25.19（Sb3Te）74.81 shows higher Tc （~ 190℃） and larger Ea （~ 3.49 eV）, which results in a better data retention maintaining for 10 yr at ~ 112 ℃. Moreover Ra/Rc value is also improved. These excellent properties make Mg-Sb-Te material a promising candidate for the phase-change memory （PCM）.展开更多
Sparse trajectory data with non-second-by-second sampling intervals are common.However,most carbon emission estimation models for vehicles require second-bysecond inputs.Additionally,some models ignore the emission ge...Sparse trajectory data with non-second-by-second sampling intervals are common.However,most carbon emission estimation models for vehicles require second-bysecond inputs.Additionally,some models ignore the emission generation principle,and some have complicated inputs.To address these limitations,this study proposes a vehicle carbon emission estimation method for urban traffic,based on sparse trajectory data.First,a trajectory reconstruction method based on interpolation of acceleration distribution is proposed.The results showed that the reconstructed trajectory was close to the real trajectory,and the accuracy was 2%-17%higher than that of other methods.Second,a carbon emission estimation model that considers both the emission generation principle and feasibility is proposed.The model with a goodness-of-fit of 0.887 had the best performance compared to the other models.The emission estimation results of the reconstructed sparse trajectories showed that the precision improved significantly for data with different frequencies compared to that of other reconstruction methods,e.g.,9%higher at a 30 s sampling interval.展开更多
文摘The compound NdFe 0.6 Sb 2 was studied by means of X ray powder diffraction. The X ray powder diffraction data and structural parameters demonstrated that this compound is of the tetragonal structure with space group P4/nmm, Z =2 and D x=7.615 g·cm -3 . The lattice parameters are a =0.43499 (1) nm and c =0.97083 (4) nm. Refinement was performed with 42 reflections.
基金Project supported by the National Key Basic Research Program,China(Grant No.2012CB722703)the National Natural Science Foundation of China(Grant Nos.61008041,61377061,and 61306147)+1 种基金the Program for Innovative Research Team of Ningbo City(Grant No.2009B21007)the K.C.Wong Magna Fund in Ningbo University,China
文摘Mg-doped Sb3Te films are proposed to improve the performance of phase-change memory （PCM）. We prepare Mg- doped Sb3Te films and investigate their crystallization behaviors, structural, optical and electrical properties. We find that Mg-doping can increase the crystallization temperature, enhance the activation energy, and improve the 10-year data retention of Sb3Te. Especially Mg25.19（Sb3Te）74.81 shows higher Tc （~ 190℃） and larger Ea （~ 3.49 eV）, which results in a better data retention maintaining for 10 yr at ~ 112 ℃. Moreover Ra/Rc value is also improved. These excellent properties make Mg-Sb-Te material a promising candidate for the phase-change memory （PCM）.
基金supported by the National Natural Science Foundation of China(No.52131204,52325210,and 52102415)the Fundamental Research Funds for the Central Universities(2023-4-YB-05).
文摘Sparse trajectory data with non-second-by-second sampling intervals are common.However,most carbon emission estimation models for vehicles require second-bysecond inputs.Additionally,some models ignore the emission generation principle,and some have complicated inputs.To address these limitations,this study proposes a vehicle carbon emission estimation method for urban traffic,based on sparse trajectory data.First,a trajectory reconstruction method based on interpolation of acceleration distribution is proposed.The results showed that the reconstructed trajectory was close to the real trajectory,and the accuracy was 2%-17%higher than that of other methods.Second,a carbon emission estimation model that considers both the emission generation principle and feasibility is proposed.The model with a goodness-of-fit of 0.887 had the best performance compared to the other models.The emission estimation results of the reconstructed sparse trajectories showed that the precision improved significantly for data with different frequencies compared to that of other reconstruction methods,e.g.,9%higher at a 30 s sampling interval.
