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Distribution of variance contribution rate of the first four modes of EOF analysis in the surface temperature field of Indonesian Sea (red indicates passing the significance test)
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Influenced by both the Pacific and Indian Oceans, the temperature field in the Indonesian Sea are complicated. In order to reveal the spatial-temporal variability, the surface, thermocline and intermediate layers of the temperature field are studied based on the global ocean reanalysis data of Copernicus Marine Environment Monitoring Service (CMEMS...
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Context 1
... emphasize seasonal variation, winter average data from 1993-2019 were taken for EOF analysis. From the distribution of variance ratios of different modes (Figure 4), it can be calculated that the first, second, third and fourth modes account for 47.1%, 18.7%, 10.9% and 4.5%, respectively. It can be determined that the interannual distribution of surface temperature is determined by the first and second modes. ...
Context 2
... 6. same as Figure 4 but for thermocline From the distribution of thermocline different modes (Figure 6), it can be calculated that the first, second, third and fourth modes account for 82.3%, 4.5%, 4.1% and 1.9%, respectively. The distribution of thermocline temperature is mainly determined by the first and second modes. ...
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... From the results, we can get that the mass percentages of Zn, O, N, and C elements are 41.58%, 19.24%, 3.09%, and 36.09%, respectively, and the corresponding atomic percentages of Zn, O, N, and C elements are 12.56%, 23.75%, 4.36%, and 59.34%, respectively [19][20][21]. The percentages of Zn, O, and N in EDS are consistent with the distribution of elements in mapping, which proves the structure of ZnO@ZIF-8 nanorods [13,14]. ...
Zinc oxide (ZnO) nanorods were synthesized by hydrothermal method, and ZnO@ZIF‐8 nanorods with core–shell heterostructure were prepared by water bath synthesis method. The ZnO nanorods were synthesized by water bath and violently stirred at 50°C and 4 h as the optimal reaction time, in which ZIF‐8 was a zeolite imidazolic acid skeleton structure. ZnO nanorods serve as the template for the growth of ZIF‐8 shell and provide Zn²⁺ ions for its growth. By X‐ray diffraction (XRD), it is proved that the nanorods are composed of ZnO and ZIF‐8. By field emission electron microscopy (SEM) and transmission electron microscopy (TEM), it is proved that ZnO@ZIF‐8 is composed of ZnO in the middle core and ZIF‐8 in the outer shell. According to the test by BET, the specific surface area of ZnO and ZnO@ZIF‐8 nanorods is 2.16 and 85.08 m²/g, respectively, and the specific surface area of the latter is much larger than that of the former. Compared with ZnO nanorod sensors, the ZnO@ZIF‐8 sensor exhibits comparable response levels to formaldehyde, and the response to other test gases is decreased, and the screening ability of formaldehyde has been improved to a certain extent, because the pore size of the ZIF‐8 shell has different restrictions on molecules of different sizes. This study shows that coating ZIFs on the surface of metal oxides is an effective method to improve the performance of gas sensors.
