To solve the critical problems of lithium rich cathode materials, e.g., structure instability and short cycle life, we have successfully prepared a ZrO2-coated and Zr-doping xLi2MnO3·(1–x)LiMO2 hollow architectu...To solve the critical problems of lithium rich cathode materials, e.g., structure instability and short cycle life, we have successfully prepared a ZrO2-coated and Zr-doping xLi2MnO3·(1–x)LiMO2 hollow architecture via one-time sintering process. The modified structural materials as lithium-ion cathodes present good structural stability and superior cycle performance in LIBs. The discharge capacity of the ZrO2-coated and Zr-doped hollow pristine is 220 mAh g-1 at the 20th cycle at 0.2 C(discharge capacity loss, 2.7%)and 150 m Ah g-1 at the 100 th cycle at 1 C(discharge capacity loss, 17.7%), respectively. However, hollow pristine electrode only delivers 203 m Ah g-1 at the 20 th cycle at 0.2 C and 124 mAh g-1 at the 100 th cycle at 1 C, respectively, and the corresponding to capacity retention is 92.2% and 72.8%, respectively.Diffusion coefficients of modified hollow pristine electrode are much higher than that of hollow pristine electrode after 100 cycles(approach to 1.4 times). In addition, we simulate the adsorption reaction of HF on the surface of ZrO2-coated layer by the first-principles theory. The calculations prove that the adsorption energy of HF on the surface of ZrO2-coated layer is about-1.699 e V, and the ZrO2-coated layer could protect the hollow spherical xLi2MnO3·(1–x)LiMO2 from erosion by HF. Our results would be applicable for systematic amelioration of high-performance lithium rich material for anode with the respect of practical application.展开更多
Visual order is one of the key factors influencing the aesthetic judgment of artworks.This paper reports the results of evaluating the influence of extracted features on visual order in Chinese ink paintings,using a r...Visual order is one of the key factors influencing the aesthetic judgment of artworks.This paper reports the results of evaluating the influence of extracted features on visual order in Chinese ink paintings,using a regression model.We use nine contemporary artists’paintings as examples and extract features related to the visual order of their paintings.A questionnaire survey is conducted to collect people’s rating scores on the visual order.Via regression modeling,our research analyzes the significance of each feature and validates the influences of the features on the visual order.展开更多
This study attempts to trace back iconographic origins of an Early Christian scene depicting a procession of women moving towards a temple. The scene makes part of the pictorial program of the so-called Chapel of Exod...This study attempts to trace back iconographic origins of an Early Christian scene depicting a procession of women moving towards a temple. The scene makes part of the pictorial program of the so-called Chapel of Exodus-a Coptic mausoleum from Kharga Oasis in Egypt. Never being among the most popular subjects of the Early Christian art, the images of the female processions are found in the monuments throughout the Late Roman Empire, from Roman catacombs to a small house-church at the Eastern border of the Pax Romana (Dura Europos, Syria). The extant scenes are dated back to different periods and belong to the different cultural milieu. The iconographic ambiguity of the procession scene from the Exodus Chapel triggered an intense scholar discussion and gave way to multiple interpretations. Still, the meaning of the episode and the reasons for its inclusion into the pictorial ensemble concept is not quite clear. The study aims to fill these particular gaps in the previous works. The semiotic and contextual analysis allows examining the scene in its relationship with juxtaposed compositions, to compare its iconographic features with descriptions of contemporary religious practices, and clarify the function of the image in the iconographic program of the Chapel of Exodus.展开更多
基金the financial support by the Natural Science Foundation of Guangdong Province(2019A1515012111)the National Natural Science Foundation of China(51804199 and 51604081)+2 种基金the Science and Technology Innovation Commission of Shenzhen(JCYJ20190808173815205 and 20180123)the Shenzhen Science and Technology Program(KQTD20180412181422399)“Chenguang Program”supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission(16CG40)。
文摘To solve the critical problems of lithium rich cathode materials, e.g., structure instability and short cycle life, we have successfully prepared a ZrO2-coated and Zr-doping xLi2MnO3·(1–x)LiMO2 hollow architecture via one-time sintering process. The modified structural materials as lithium-ion cathodes present good structural stability and superior cycle performance in LIBs. The discharge capacity of the ZrO2-coated and Zr-doped hollow pristine is 220 mAh g-1 at the 20th cycle at 0.2 C(discharge capacity loss, 2.7%)and 150 m Ah g-1 at the 100 th cycle at 1 C(discharge capacity loss, 17.7%), respectively. However, hollow pristine electrode only delivers 203 m Ah g-1 at the 20 th cycle at 0.2 C and 124 mAh g-1 at the 100 th cycle at 1 C, respectively, and the corresponding to capacity retention is 92.2% and 72.8%, respectively.Diffusion coefficients of modified hollow pristine electrode are much higher than that of hollow pristine electrode after 100 cycles(approach to 1.4 times). In addition, we simulate the adsorption reaction of HF on the surface of ZrO2-coated layer by the first-principles theory. The calculations prove that the adsorption energy of HF on the surface of ZrO2-coated layer is about-1.699 e V, and the ZrO2-coated layer could protect the hollow spherical xLi2MnO3·(1–x)LiMO2 from erosion by HF. Our results would be applicable for systematic amelioration of high-performance lithium rich material for anode with the respect of practical application.
文摘Visual order is one of the key factors influencing the aesthetic judgment of artworks.This paper reports the results of evaluating the influence of extracted features on visual order in Chinese ink paintings,using a regression model.We use nine contemporary artists’paintings as examples and extract features related to the visual order of their paintings.A questionnaire survey is conducted to collect people’s rating scores on the visual order.Via regression modeling,our research analyzes the significance of each feature and validates the influences of the features on the visual order.
文摘This study attempts to trace back iconographic origins of an Early Christian scene depicting a procession of women moving towards a temple. The scene makes part of the pictorial program of the so-called Chapel of Exodus-a Coptic mausoleum from Kharga Oasis in Egypt. Never being among the most popular subjects of the Early Christian art, the images of the female processions are found in the monuments throughout the Late Roman Empire, from Roman catacombs to a small house-church at the Eastern border of the Pax Romana (Dura Europos, Syria). The extant scenes are dated back to different periods and belong to the different cultural milieu. The iconographic ambiguity of the procession scene from the Exodus Chapel triggered an intense scholar discussion and gave way to multiple interpretations. Still, the meaning of the episode and the reasons for its inclusion into the pictorial ensemble concept is not quite clear. The study aims to fill these particular gaps in the previous works. The semiotic and contextual analysis allows examining the scene in its relationship with juxtaposed compositions, to compare its iconographic features with descriptions of contemporary religious practices, and clarify the function of the image in the iconographic program of the Chapel of Exodus.
