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This paper analyzes the overall characteristics and regional differences of land use efficiency and landscape pattern in all districts and counties of Guangxi in 2020 under the research framework of ESDA-GWR, and quantitatively studies the impact mechanism of patch shape characteristics and spatial distribution characteristics of cultivated land, rural residential land, and urban construction land on land use efficiency. The results show that land use efficiency of Guangxi is generally on a moderate level yet with significant regional differences, the efficiency of center areas within Prefecture level are generally higher relative to the surrounding areas. The Beibu Gulf Economic Zone shows a strong strength on socio-economic development with a high land use efficiency, while the Xijiang Economic Belt develops fast but with a low land use efficiency. Landscape metrics of different areas in Guangxi share a significant positive spatial correlation. The north and southwest part of Guangxi use their land resources in a more intensive way, while central and southeast part is in an extensive developing mode. Regular and contiguous arable land, economical and intensive rural residential land, and "One-Core-Multipart" urban construction land can significantly improve land use efficiency. Among them, the layout of urban construction land that reaches a larger scale and has a clear central urban area has a particularly significant positive impact on land use efficiency. [ABSTRACT FROM AUTHOR]

In order to study the interlayer dosage of the ultra-thin overlay and original pavement, mixture specimens were scanned and reconstructed by computed tomography(CT) and three dimensional reconstruction technology. The dosage of epoxy asphalt filled was determined according to voids distribution. On this basis, effects of asphalt contents on the shear and bond strength were analyzed by the laboratory 45° oblique shear, direct shear and pulling tests at 25, 60 ℃ . Results show that voids of Novachip Type-A epoxy asphalt and SMA-13 mixture are C-shaped along the height of the sample, and effective voids are concentrated at the surface of 2 mm and the bottom of 1 mm, so the asphalt dosage filling voids is 0. 25 kg/ m² . In laboratory tests, the interfacial asphalt satisfied the maximum shear and bond strength is 0. 7 kg/ m² . Adhesion and cohesion destruct when the interfacial dosage is low or excess, so the optimal interlaminar dosage is 0. 95 kg/ m² . [ABSTRACT FROM AUTHOR]