排序方式: 共有134条查询结果,搜索用时 15 毫秒
131.
Warunee Lueangchaichaweng Neil R. Brooks Sonia Fiorilli Elena Gobechiya Kaifeng Lin Li Li Sonia Parres‐Esclapez Elsa Javon Sara Bals Gustaaf VanTendeloo Johan A. Martens Christine E. A. Kirschhock Pierre A. Jacobs Paolo P. Pescarmona 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2014,126(6):1611-1615
Gallium oxide nanorods with unprecedented small dimensions (20–80 nm length and 3–5 nm width) were prepared using a novel, template‐free synthesis method. This nanomaterial is an excellent heterogeneous catalyst for the sustainable epoxidation of alkenes with H2O2, rivaling the industrial benchmark microporous titanosilicate TS‐1 with linear alkenes and being much superior with bulkier substrates. A thorough characterization study elucidated the correlation between the physicochemical properties of the gallium oxide nanorods and their catalytic performance, and underlined the importance of the nanorod morphology for generating a material with high specific surface area and a high number of accessible acid sites. 相似文献
132.
基于像素结构空间光调制器的全息再现像问题研究 总被引:7,自引:0,他引:7
基于纯相位空间光调制器的全息显示系统在重构显示时,再现像的视觉效果受到空间光调制器像素结构引起的多级衍射光和多级再现像的干扰。在分析具有有限填充因子空间光调制器的像素结构对再现像影响的基础上,提出了一种提高全息再现像的视觉效果并且再现像成像位置和大小可调节的方法。先加载闪耀光栅到纯相位全息图,其次通过叠加会聚球面波相位,分离再现像与空间光调制器像素结构引起的多级衍射光的聚焦平面的位置,再利用光阑和高通滤波器的共同作用,消除高级衍射光、多级再现像以及零级光干扰对重构视觉效果的影响,最后引入成像透镜,调节再现像的成像位置与大小。建立了一套基于硅基液晶的全息显示系统用于实验验证。实验结果表明,最终的单一再现像清晰且可以方便地调节成像位置和大小。该方法同样适用于各种基于像素结构空间光调制器的全息光学系统。 相似文献
133.
Zhengming Hao Junjie Zhang Miao Xie Xuechao Li Lina Wang Ye Liu Kaifeng Niu Junbo Wang Luying Song Tao Cheng Haiming Zhang Lifeng Chi 《中国科学:化学(英文版)》2022,65(4):733-739
Direct coupling or transformation of inert alkanes based on the selective C–H activation is of great importance for both chemistry and chemical engineering. Here, we report the coupling of polyenes that are transformed from n-dotriacontane (n-C32H66)through on-surface cascade dehydrogenation on Cu (110) surface, leading to the formation of polyacetylene (PA). Three distinct linkages have been resolved by scanning tunneling microscope (STM) and noncontact atomic force micros... 相似文献
134.
采用射频(RF)和单极中频直流脉冲磁控溅射方法,在玻璃基板上制备了(Ti/ZnO)N成分调制纳米多层膜,并研究了调制周期数对其结构及透光导电性能的影响。通过X射线衍射、拉曼光谱、原子力显微镜、紫外可见吸收光谱以及霍尔效应测试结果表明:(Ti/ZnO)N成分调制纳米多层膜以(002)取向的纤锌矿型ZnO结构为主,具有明确的成分调制结构,各Ti层和各ZnO层厚度均匀连续,各界面平整且无明显扩散。在可见光范围的平均透光率大于85%,电阻率最小可达到2.63×10-2 Ω·cm。 相似文献