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Stem cells have significant potential use in tissue regeneration, especially for treating cardiac diseases because of their multi-directional differentiation capability. By mimicking the in vivo physiological environment of native cardiomyocytes during their development and maturation, researchers have been able to induce pluripotent stem cell-derived cardiomyocytes (PSC-CMs) at high purity. However, the phenotype of these PSC-CMs is immature compared with that of adult cardiomyocytes. Various strategies have been explored to improve the maturity of PSC-CMs, such as long-term culturing, mechanical stimuli, chemical stimuli, and combinations of these strategies. Among these strategies, mechanical stretch as a key mechanical stimulus plays an important role in PSC-CM maturation. In this review, the optimal parameters of mechanical stretch, the effects of mechanical stretch on maturation of PSC-CMs, underlying molecular mechanisms as well as existing problems are discussed. Mechanical stretch is a powerful approach to promote the maturation of SC-CMs in terms of morphology, structure, and functionality. Nonetheless, further research efforts are needed to reach a satisfactory standard for clinical applications of PSC-CMs in treating cardiac diseases.

In response to the call of paperless meeting put forward by the national grid and reduce the waste of resources requirements, this paper introduces an intelligent review terminal for power marketing business expansion project, by studying the Cutting-edge technologies such as keyword retrieval, semantic analysis, the customizable and automatable knowledge base and intelligent analysis. At the beginning of review link of business expansion project, the functions implemented for customers to do like self-help pre-qualification online, the query of current standards, auxiliary intelligent review, Bluetooth print, experts login management, experts assessment management, it can assist power enterprise marketing in completing the file review of business expansion project by standard, normalized and intelligent operations, it also proposes a new technology of documents review for the departments of electric power industry.

Estimation to the point spread function (PSF) of an imaging system is a highly demanded technique, and it plays an important role in the process of image restoration. Based on the implementation of a planar-scanning passive millimeter-wave (PMMW) imaging system which operates at W-band, the imaging model is described and parameters estimation to the PSF of the imaging system is carried out with the method of a priori blur identification. The experiment results validate the fact that the quality of the restoration to the images, which are acquired by the PMMW imaging system in a RF anechoic chamber, has been improved with the estimated PSF.