In laser beam welding, when the width of weld seam is less than 0.1 mm, present vision sensorbased measurements can barely obtain the seam width and seam position stably and reliably. A seam measuring method based on narrow depth of field (NDOF) is proposed in this article, which aims to detect this kind of narrow and small weld seam with great accuracy. This measurement system consists of a multiple optical magnifier, a Charge-Coupled Device/ Complementary Metal Oxide Semiconductors (CCD/CMOS) camera, and an external lightemitting diode lighting unit. First, the principle of the NDOF method is explained. Second, key features of weld seam are extracted by image-processing algorithm. Lastly, the result of experiment reveals that the NDOF method can meet the demanded detection precision. Measurement accuracy for the seam width and seam position is 6 and 8 μm, respectively.
Customized bus, a new-type traveling mode in China, now has become the first choice for part of city residents due to its quality services. However, customized bus in China is still at the initial stage of exploration. Its route design and vehicle scheduling have not yet formed a unified methodology. Therefore, carrying on planning on customized bus is an important issue which should be considered by traffic researchers. In this article, scheduling method of single-line customized bus was studied. A related model was established to obtain customized bus operation plan of single line. Meanwhile, practical examples were used to validate the models, providing references for the development of customized bus in China.
Coordination method between long-term and short-time generation scheduling of wind power integrated system are proposed. Long-term scheduling mainly solves unit maintenance scheduling and energy allocation among weeks, and short-term scheduling decides unit commitment and hourly power output. In order to cope with the high uncertainty of wind power and load demand, dynamic rolling generation scheduling are implemented weekly based on the updated load and wind power prediction results. A modified IEEE 118-bus system is applied to test the proposed model.
In this paper, the photocatalytic activity enhancement of TiO thin films was realized by laser irradiation. The H yield of the as-irradiated film is 79 μmol/(h*m), which is 33% more than that of the as-deposited TiO film. Spectrophotometer, X-ray diffraction and Raman system were employed to characterize the samples. The results showed that both the scanning rate and line spacing of the laser modification have effects on photocatalytic activity. It suggests that a phase junction is formed between the amorphous and rutile phases. The increment of H generation could be attributed to the alignment of Fermi levels in the phase junction.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.