排序方式: 共有35条查询结果,搜索用时 15 毫秒
31.
本文提出了一种多普勒振镜正弦调制多光束激光外差测量玻璃厚度的新方法. 基于激光外差技术和多普勒效应, 通过做简谐振动的多普勒振镜对不同时刻入射光的频率进行正弦调制, 把待测厚度信息加载到外差信号的频率差中, 通过快速傅里叶变换对外差信号解调后可以同时得到多个待测玻璃厚度值, 经加权平均处理可以提高待测厚度的测量精度. 利用这种新方法, 通过MATLAB仿真测量了不同玻璃厚度值, 结果表明:该测量结果的最大相对误差小于0.008%. 相似文献
32.
33.
在氨基化改性的四氧化三铁(Fe3O4)纳米粒子表面引发N-羧酸酐L-谷氨酸苄酯(BLG-NCA)开环聚合, 制得四氧化三铁/聚L-谷氨酸苄酯(PBLG)复合材料(Fe3O4-g-PBLG). 改变单体和引发剂比例可以调控Fe3O4-g-PBLG的接枝率, 采用热失重分析(TGA)测得实际接枝率分别为66.36%, 79.66%和89.52%. 通过双乳液挥发法制备磁性Fe3O4-g-PBLG多孔微载体, 其中接枝率为89.52%的微载体密度为1.034 g/mL, 孔隙率为92.57%, 粒径为200~300 μm, 孔径为40~50 μm, 保水率为370%~400%. 同时Fe3O4-g-PBLG微载体具有超顺磁性, 在外加磁场作用下可排布成任意形状, 对治疗复杂结构的骨缺损具有显著优势. 因此Fe3O4-g-PBLG多孔微载体在骨组织工程领域具有潜在应用价值. 相似文献
34.
Scanning the optical characteristics of lead-free cesium titanium bromide double perovskite nanocrystals 下载免费PDF全文
Cs2TiBr6 nanocrystals (NCs) are a type of promising optoelectronic materials, owing to their high photoelectric properties and non-toxicity. Here, we synthesize the colloidal Cs2TiBr6 NCs using a hot-injection approach. The temperature-dependent absorption data shows that its energy band changes about 30 meV with temperature, reflecting that its energy band structure is much stable. The excitation intensity-dependent transient absorption data confirms its linear absorption cross-sections and carrier recombination rate constants, involving monomolecular and bimolecular recombination, which are all superior to those of conventional perovskite bromide counterparts. In addition, its nonlinear absorption cross-sections are also measured based on femtosecond Z-scan. Our results suggest that Cs2TiBr6 NCs can be extensively applied in the field of optoelectronics, owing to its excellent carrier dynamics and nonlinear optical properties. 相似文献
35.