As the capacity reach as high as 350 Wh•kg −1 and 750 Wh•L −1 , zinc-silver batteries are widely used in military, aerospace and other fields because of their high specific energy and discharging rate, together with their safety and reliability. In this paper, the researches progresses of silver oxide electrode in eliminating high plateau stage, improving thermal stability and its structure are reviewed. Also the corrosion inhibitor of zinc electrode to prevent hydrogen evolution is summarized. In addition, the technical progress of battery separator is presented. The developing trends of the zinc silver battery are prospected.

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Background: To investigate the dynamic changes in high-resolution computed tomography (HRCT) findings of coronavirus disease 2019 (COVID-19) patients with different severities in different disease stages. Methods: We retrospectively collected the clinical and imaging data of 96 patients in Yunnan Province, China, who were diagnosed with COVID-19 between January 22 and March 15, 2020. Based on disease severity, the COVID-19 patients were classified into four types: mild (n=15), moderate (n=59), severe (n=19), and critical (n=3). Based on hospital stay and number of computed tomography (CT) scans, the clinical/ disease course was divided into four stages, including stage 1 (days 0-4), stage 2 (days 5-9), stage 3 (days 10-14), and stage 4 (days 15-19). The HRCT findings, CT value, and lesion volume were analyzed for each stage and compared among the four stages of COVID-19 patients. Results: CT findings were negative over the four stages for all mild COVID-19 patients. More lesions were found in the peripheral lung fields than in peripheral + central fields (P<0.05), and the number of negative patients in stage 4 were more than those in stages 1-3 (P<0.05). The left and right lower lobe were the most frequently affected lobes (P<0.05). In moderate patients, round ground glass opacities (GGOs) decreased from stage 1 to stage 4; partial consolidation peaked in stage 2 and then decreased in stages 3-4; Huang et al. Dynamic changes in chest CT of COVID-19 patients

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