排序方式: 共有9条查询结果,搜索用时 140 毫秒
1
1.
IntroductionInthefirstpatofacsinvestigation,athree-lumpmodelisproposedforthereaCtionsystemofMFTrefonning.However,theveryimportantworkforthekineticsanalysisistOd~inetheparametersinthekineticsequations.Becausethereisnopriormethodfordotennnungthesep~ers,expe… 相似文献
2.
3.
970nmLD激发Tm^3+,Yb^3+掺杂的MFT玻璃材料上转换发光的研究 总被引:4,自引:1,他引:3
设计并制备了一种Tm^3+、Yb^3+共掺杂的多氟化物调整碲酸盐(MFT)玻璃材料,其组份为50TeO2-14.PbF2-10AlF3-10BaF2-10NaF-0.1Tm2O3-5Yb2O3。测量了该玻璃系统的Raman散射光谱,在970nmLD激发下裸眼可以观察到很强的蓝色我,光谱测量证实这个蓝色发射(476nm)来源于^1G4→^3H6的跃迁,同时,还有两个较弱的红色发射源于^1G4→^3H 相似文献
4.
Molecular dynamics (MD) simulation based on Langevin equation has been widely used in the study of structural, thermal properties of matter in different phases. Normally, the atomic dynamics are described by classical equations of motion and the effect of the environment is taken into account through the fluctuating and frictional forces. Generally, the nuclear quantum effects and their coupling to other degrees of freedom are difficult to include in an efficient way. This could be a serious limitation on its application to the study of dynamical properties of materials made from light elements, in the presence of external driving electrical or thermal fields. One example of such system is single molecule dynamics on metal surface, an important system that has received intense study in surface science. In this review, we summarize recent effort in extending the Langevin MD to include nuclear quantum effect and their coupling to flowing electrical current. We discuss its applications in the study of adsorbate dynamics on metal surface, current-induced dynamics in molecular junctions, and quantum thermal transport between different reservoirs. 相似文献
5.
基于空间太阳望远镜已有的光机热集成研究,结合其运载轨道修改、观测视场扩大等因素的调整,获取了深空太阳天文台磁场望远镜主反射镜温度分布的定量结果.采用光机热集成分析法,结合主反射镜前期的支承方案,获取了主反射镜在装夹状态下的热变形定量描述.采用抛物面多项式和Zernike多项式拟合,获取了主反射镜表面热变均方差值大于λ/40(λ=533nm)的热控准确度,无法确保系统获取0.1″的高分辨率成像目标,验证了预研阶段热控方案的局限性.提出修改主反射镜正三角的机框式支撑为六点支撑的建议,为深空太阳天文台磁场望远镜热控准确度的提高、热控方案的优化提供技术参考. 相似文献
6.
7.
通过参数估计和模型筛选,获得了正庚烷和MFT模型混合物在ZSM5分子筛催化剂上的结焦动力学方程,模型能够和实验数据较好地关联,最大相对误差不超过±20%。用正庚烷模拟FT合成产物中碳数小于11烃在ZSM5分子筛催化剂上的结焦,用MFT模型混合物来模拟FT合成产物中C+12烃在ZSM5上的结焦,则:C=31.53e14896.74RTt0.33f0.221+173.19e17628.13RTt0.20f0.292能够较准确地预测MFT中试改质反应器入口附近分子筛催化剂上的焦含量。结合本研究的第一部分,对不同反应原料在ZSM5上的结焦行为进行了比较,表明ZSM5上的结焦很可能是一个扩散控制过程。 相似文献
8.
通过与FAT文件系统的比较,分析了NTFS文件系统在磁盘上的结构,并用具体实例研究了NTFS最重要的主文件表MFT元文件。 相似文献
9.
IotroduotionItiswellknoWnthatFTsynthesisisaneffe~waytOCO~syngastOhydrocarbonSll].HoweVer,edthel~onofSchulz-Florydistribution[2],theyieldofthehydrOCarbonswithcarbonnUmberintherangeofgasolineislower.Atthesametime,theOCtanenUmberofacgasolineislowerthanthatof… 相似文献
1