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991.
To realize spectral diffuse reflectance scale in 0/d geometric condition at National Institute of Metrology in China (NIM), a facility based on a non-standard auxiliary integrating sphere method with special structure has been built up and a correction method for the influence on the thickness of PTFE (polytetrafluoroethylene) coating at the port of auxiliary integrating sphere is mainly discussed. The uncertainty of spectral diffuse reflectance in NIM is approximately 0.25% (k = 2) in 380–800 nm. This facility has been used to establish China diffuse reflectance scales in the VIS–NIR part of the spectrum. This system and correction method presented in this paper can be easily implemented on most commercial spectrophotometers with a lower cost. 相似文献
992.
Wenkai Liang Zheng Chen Fan Yang Huiqiang Zhang 《Proceedings of the Combustion Institute》2013,34(1):695-702
The effects of Soret diffusion on premixed syngas/air flames at normal and elevated temperatures and pressures are investigated numerically including detailed chemistry and transport. The emphasis is placed on assessing and interpreting the influence of Soret diffusion on the unstretched and stretched laminar flame speed and Markstein length of syngas/air mixtures. The laminar flame speed and Markstein length are obtained by simulating the unstretched planar flame and positively-stretched spherical flame, respectively. The results indicate that at atmospheric pressure the laminar flame speed of syngas/air is mainly reduced by Soret diffusion of H radical while the influence of H2 Soret diffusion is negligible. This is due to the facts that the main reaction zone and the Soret diffusion for H radical (H2) are strongly (weakly) coupled, and that Soret diffusion reduces the H concentration in the reaction zone. Because of the enhancement in the Soret diffusion flux of H radical, the influence of Soret diffusion on the laminar burning flux increases with the initial temperature and pressure. Unlike the results at atmospheric pressure, at elevated pressures the laminar flame speed is shown to be affected by the Soret diffusion of H2 as well as H radical. For stretched spherical flame, it is shown that the Soret diffusion of both H and H2 should be included so that the stretched flame speed can be accurately predicted. Similar to the laminar flame speed, the Markstein length is also reduced by Soret diffusion. However, the reduction is found to be mainly caused by Soret diffusion of H2 rather than that of H radical. Moreover, the influence of Soret diffusion on the Markstein length is demonstrated to decrease with the initial temperature and pressure. 相似文献
993.
Using full-potential linearized augmented plane wave (FLAPW) method, we investigated the effects of intrinsic vacancies on electronic and magnetic properties in graphene-like ZnO nanosheets. The results show that the oxygen vacancy (VO) has no influence on magnetism in ZnO nanosheet, whereas the Zn vacancy (VZn) lead to spin polarization of the nanostructures with a total magnetic moment of 2.0μB due to O-2p and Zn-3d hybridization. When the distance of two VZn defects increases to 6.499 Å, the system shows an intriguing half-metallic character with 100% spin-polarized carriers due to O(2p)–Zn(3d)–O(2p) coupling chain between two VZn defects. 相似文献
994.
ABSTRACTThe spin-Hamiltonian parameters (g factors gi, hyperfine structure constants Ai (95Mo5+) and Ai (97Mo5+), i?=?// and ⊥) assigned to the tetragonal Mo5+ (4d1) tetrahedral center in α-ZnMoO4 crystal caused by a Mo6+(1) ion trapping an electron after x-ray irradiation are calculated from the high-order perturbation formulas resting on the two-mechanism model. The model takes account of both the effects of crystal-field (CF) mechanism concerning the CF excited states in the CF theory and that of the charge-transfer (CT) mechanism related to CT excited states. The calculated results are reasonably consistent with the experimental values, confirming this assignment (or defect model). The calculations also indicate that the effect of CT mechanism cannot be neglected. The defect structure (particularly, the angular distortion) and signs of constants Ai (95Mo5+) and Ai (97Mo5+) of this Mo5+ defect center are also decided from the calculations. The outcomes are discussed. 相似文献
995.
Zheng Wen-Chen 《辐射效应与固体损伤》2013,168(1-2):169-178
Abstract The tetragonal distortions of local octahedral environments of Cr3+, Fe3+ and Gd3+ ions in Rb2CdF4, Cs2CdF4, RbCdF3 and CsCdF3 crystals have been studied by analyzing their EPR spectra. From the studies, it is found that the tetragonal distortions for Cr3+ and Fe3+ impurity ions, which substitute Cd2+ and have nearly the same ionic radius, are close to each other, whereas that for Gd3+ impurity ion, having a larger ionic radius, is larger than those for Cr3+ and Fe3+ ions in the same crystal. It appears that not only the impurity-ligand distance, but also the tetragonal distortions of impurity centres in crystals are closely related to the size of impurity. 相似文献
996.
997.
通过生物矿化法制备出HgS/聚氨酯纳米复合材料并用FTIR、SEM等对材料进行了表征. 研究发现聚氨酯分子可以控制HgS的成核和晶体生长. 聚氨酯的量子限域效应已通过紫外-可见光谱证实,在约291 nm处有明显的特征吸收峰. 荧光性能研究结果表明HgS/聚氨酯纳米粒子复合薄膜对Ba2+的存在十分敏感,少量的Ba2+会使荧光强度明显上升,水中常见离子几乎对此没有影响. 相似文献
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