排序方式: 共有79条查询结果,搜索用时 15 毫秒
61.
以ZSM-5晶体作为主体材料,采用热扩散方法于750和850℃在空气中分别制备了SnO2/ZSM-5主客体材料,通过一系列方法考察了该材料的化学组成、晶体形貌、晶相、光致发光等物理化学性质.采用基于密度泛函理论(DFT)的微孔吸附分析方法对该材料的孔结构进行详细研究,推断了该材料中SnO2的分布方式.结果表明:二氧化锡团簇负载到了分子筛孔道中而非分布在晶体表面,而且随着热扩散温度升高,样品中SnO2的含量增多;进入分子筛中的二氧化锡团簇主要分布在ZSM-5分子筛的微孔中;负载后的分子筛晶体在热扩散温度为750℃时保持了较好的晶体形貌而且具有较好的可见光通透性和良好的荧光发光性能,具有较大后续的器件化和功能化应用潜力. 相似文献
62.
Structures and Dynamics of Two-Dimensional Dust Lattices with and without Coulomb Molecules in Plasmas 下载免费PDF全文
Structures and dynamics of two-dimensional dust lattices with and without Coulomb molecules in plasmas are investigated. The experimental results show that the lattices have the crystal-like hexagonal structures, i.e. most particles have six nearest-neighboring particles. However, the lattice points can be occupied by the individual particles or by a pair of particles called Coulomb molecules. The pair correlation function is used to compare the structures between the lattices with or without the Coulomb molecules. In the experiments, the Coulomb molecules can also decompose and recombine with another individual particle to form a new molecule. 相似文献
63.
报道了环己烯(C6H10)分子2b和3a轨道电子动量谱的首次研究,并且给出了价轨道的电离能谱信息,实验在非共面对称几何条件下的能量多道型电子动量谱仪下完成,入射电子的能量为1200eV加结合能.通过Hartree-Fock和密度泛函方法计算得到了C6H10分子2b和3a轨道的动量谱,在动量大于0.25a.u.区域理论与实验结果符合较好,实验结果与理论计算相比在低动量端出现“上翘”的现象,这可能是由于分子的扭曲波效应引起的. 相似文献
64.
在苯(C6H6)和四氟化碳(CF4)混合气体中,用微波电子回旋共振等离子体化学气相沉积技术(ECRCVD)在不同功率下制备了氟化非晶碳膜(aC:F),为了检测膜的热稳定性对其进行了真空退火处理,测量了退火前后膜厚的变化率,并用傅里叶变换红外吸收光谱(FTIR)研究了其结构的变化.结果表明,膜厚变化率与沉积功率有关;400℃退火后低功率下沉积的膜的结构变化显著,高功率下沉积的膜则呈现了较好的热稳定性.
关键词:
ECR-CVD
aC:F薄膜
真空退火 相似文献
65.
Various dusty voids are observed in a gas discharge dusty plasma system. They appear at the earlier stage of particle growth. Both the regular and irregular voids are observed in two and three dimensions. Regular voidsobs erved in two dimensions include circular shapes and thin ring shapes. Regular voids in three dimensions appear dome-shaped and shell-shaped. 相似文献
66.
67.
针对波前整形的背景噪声问题,提出了一种有效抑制背景噪声的算法。首先搭建闭环波前整形聚焦系统,并基于传统遗传算法进行聚焦实验以验证系统的有效性。然后从增强信噪比的目的出发,提出与以往的多目标优化遗传算法不同的迭代方法,即采用增强倍数而不是绝对强度的判别式来评估目标点的聚焦质量。实验结果表明,改进后的遗传算法将显著噪点亮斑的面积减少了70.4%,聚焦光斑的圆度由0.83提升到0.93。基于实验结果提出背景平均光强与调控面积之间的量化关联模型,并通过量化关联模型对统计实验数据进行拟合,验证了该模型的有效性,实现对聚焦后背景噪声的定量表述。 相似文献
68.
光学窗口材料激光辐照热-力效应的解析计算研究 总被引:9,自引:0,他引:9
建立了高功率连续激光辐照透明光学材料的热力学模型,通过积分变换方法求解三维热传导方程,得出了激光辐照引起的瞬态温度场分布的精确解析解,并在此基础上进一步求得热应力场的瞬态分布。以1.315μm的高能氧碘激光辐照熔石英玻璃为例,计算了熔石英在激光辐照下的温度场与热应力场分布,分析了其激光损伤机理。研究结果表明由于熔石英具有优良的热稳定性,温度不均匀分布所产生的热应力相对较小,激光损伤主要是受辐照区域温度值超过材料熔点发生熔融破坏。理论分析结果与相关的实验结论一致,说明所建立激光辐照效应模型的合理性。 相似文献
69.
Influence of gas pressure on the pattern evolutions of dust clusters and fractals in a dusty plasma system 下载免费PDF全文
Dusty plasma has been produced through chemical reaction in a capacitively coupled radio frequency (rf) discharge system. Dust clusters with a few particles and dust fractals are observed. As gas pressure is increased, the suspended height of dust particles descends and the average interparticle distance decreases accordingly. The influence of gas pressure on the pattern evolutions is investigated. Dust clusters or fractals not only can evolve regularly on a horizontal plane, but also can evolve from a horizontal plane to a vertical line array. Under appropriate conditions, the evolutions are reversible. When the evolution is from a symmetrical pattern with a centre particle to another pattern, the centre particle will first show its unsteadiness. 相似文献
70.