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排序方式: 共有252条查询结果,搜索用时 15 毫秒
251.
Yasufumi Takahashi Yu Kobayashi Ziqian Wang Yoshikazu Ito Masato Ota Hiroki Ida Akichika Kumatani Keisuke Miyazawa Takeshi Fujita Hitoshi Shiku Yuri E. Korchev Yasumitsu Miyata Takeshi Fukuma Mingwei Chen Tomokazu Matsue 《Angewandte Chemie (International ed. in English)》2020,59(9):3601-3608
High‐resolution scanning electrochemical cell microscopy (SECCM) is used to image and quantitatively analyze the hydrogen evolution reaction (HER) catalytically active sites of 1H‐MoS2 nanosheets, MoS2, and WS2 heteronanosheets. Using a 20 nm radius nanopipette and hopping mode scanning, the resolution of SECCM was beyond the optical microscopy limit and visualized a small triangular MoS2 nanosheet with a side length of ca. 130 nm. The electrochemical cell provides local cyclic voltammograms with a nanoscale spatial resolution for visualizing HER active sites as electrochemical images. The HER activity difference of edge, terrace, and heterojunction of MoS2 and WS2 were revealed. The SECCM imaging directly visualized the relationship of HER activity and number of MoS2 nanosheet layers and unveiled the heterogeneous aging state of MoS2 nanosheets. SECCM can be used for improving local HER activities by producing sulfur vacancies using electrochemical reaction at the selected region. 相似文献
252.
In the first part of this paper, sub-pixel displacement detection methods in particle image velocimetry (PIV) measurements
were discussed. Some schemes for calculating the spatial gradient in a gradient method, which is one of sub-pixel displacement
detection methods, were evaluated. It was found that the second order central finite difference scheme tends to underestimate
the gradient of the tracer-particle’s intensity. Consequently it leads to an overestimation of sub-pixel displacements. A
first-frame upstream and second-frame downstream finite difference scheme was then proposed and evaluated for one-dimensional
flow measurements. Furthermore, the proposed difference scheme was extended to apply to two-dimensional flows. It was shown
that taking the direction of the sub-pixel correction into account and using fewer adjacent pixels are important for PIV images
consisting of small tracer particle images. Finally, a robust procedure for the execution of the gradient method was proposed,
which can eliminate the effect of noises. It was found that the proposed scheme is not only highly accurate but is highly
robust to noise. 相似文献