It is a highly desirable but still a challenging task to find a simple, fast and straightforward method to greatly improve the electrochemical properties of a Co3O4 electrode for pseudocapacitors.
Electricity is becoming more important as an alternative energy replacing fossil fuels, as it can be obtained from solar, tide, and wind while being mostly harmless to the environment. The lithium-ion battery (LIB) has high potential in this regard. The silicon-based anode of LIB is a strong performer among different designs of LIBs and entered into service due to high specific energy and low operation potential. However, volume expansion during charging is a pressing problem. Low dimensional nanomaterials possess high specific surface area and special micro-mechanical properties, which can mitigate this problem effectively. This article focuses on cutting-edge nanoscale research from three-dimensionality angles, including 0D, 1D and 2D. For 0D, the core-shell structure is discussed, and modified structures based on the core-shell structure are introduced with a brief discussion on the preparation and structural features. For 2D anodes, silicon-based thin-film materials offer better stability and higher specific capacity. The preparation method of magnetron sputtering is discussed, and p-type doped SiOx/Si/SiOx sandwich LIB anodes are also introduced.
Abstract Employing a series of norbornadiene derivatives as substrates, the effects of various substituents on the Ir‐catalyzed [2 + 2] cycloaddition reactions with arylacetylenes are studied.
Open up: An [Ir(COD)Cl]2/ (S)-NMDPP (COD=1,5-cyclooctadiene; NMDPP=neomenthyldiphenylphosphine) complex catalyzes asymmetric ring-opening reactions of oxabenzonorbornadienes with phenolic or naphtholic nucleophiles efficiently. Up to 96 % yield and 88 % ee was achieved. DMF=N,N-dimethylformamide. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
This study aimed at exploring and contrasting the clinical significances and values of MRI, CT and contrast-enhanced ultrasonography in FIGO staging of cervical carcinoma.The contrast-enhanced ultrasonography, CT and MRI imaging data of 348 patients with cervical carcinoma confirmed by clinical pathology were analyzed retrospectively and contrasted with pathological findings.The total accuracy of MRI in cervical carcinoma staging was 79.89% (278/348), and the diagnostic accuracy of MRI in stage IB, stage II, stage III and stage IV of cervical carcinoma was 74.29% (26/35), 75.74% (153/202), 85.25% (52/61), 94.00% (47/50), respectively. The total accuracy of CT in cervical carcinoma staging was 73.28% (255/348), and the diagnostic accuracy of CT in stage IB, stage II, stage III and stage IV of cervical carcinoma was 60.00% (21/35), 69.80% (141/202), 78.69% (48/61), 94.00% (45/50), respectively. The total accuracy of contrast-enhanced ultrasonography in cervical carcinoma staging was 57.47% (200/348), and the diagnostic accuracy of contrast-enhanced ultrasonography in stage IB, stage II, stage III and stage IV of cervical carcinoma was 37.14% (13/35), 50.99% (103/202), 70.49% (43/61), 82.00% (41/50), respectively. The accuracy of MRI in the diagnosis of stage IB, stage II of cervical carcinoma was higher than that of CT and contrast-enhanced ultrasonography (p<0.05), and the diagnostic accuracy of CT was higher than that of contrast-enhanced ultrasonography (p<0.05). The differences among the three methods were statistically significant.According to the results of pathological sections, there were statistically significant differences among the sensitivity and specificity of MRI, CT and contrast-enhanced ultrasonography in the diagnosis of stage IB and stage II (p<0.05). MRI has high diagnostic values in the differentiation and diagnosis of cervical carcinoma staging.
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