In conventional reinforced soil structures,the reinforcements are often laid hori-zontally in the soil.In this paper,a new concept of soil reinforced with denti-strip inclusions was proposed and a series of laboratory...In conventional reinforced soil structures,the reinforcements are often laid hori-zontally in the soil.In this paper,a new concept of soil reinforced with denti-strip inclusions was proposed and a series of laboratory model tests were carried out on sand retaining wall reinforced with denti-strip inclusions.Besides the horizontal displacements of the facing,the lateral earth pressures acting on vertical elements were measured.A microscopic measurement was performed to investigate the deformation and progressive failure of the sand within model retaining wall.Based on the image analytical technique,the bearing capability and interaction mechanism of reinforced sand retaining wall were analyzed.The model of the initial shear failure and potential failure surface were also put forward.From the experimental results,it is shown that denti-strip inclusions can increase the bearing capability of retaining wall significantly and restrict the facing displacements efficiently,as compared with conventional horizontal reinforcement.展开更多
Biomedical applications of porous calcium car- bonate （CaCO3） microspheres have been mainly restricted by their aqueous instability and low remineralization rate. To overcome these obstacles, a novel symmetry-breaki...Biomedical applications of porous calcium car- bonate （CaCO3） microspheres have been mainly restricted by their aqueous instability and low remineralization rate. To overcome these obstacles, a novel symmetry-breaking assembled porous calcite microsphere （PCMS） was con- structed in an ethanol/water mixed system using a two-step vapor-diffusion/aging crystallization strategy. In contrast to the conventional additive-induced crystallization method, the present strategy was performed under mild conditions and was free from any foreign additives, thus avoiding the potential contamination of the final product. Meanwhile, the prepared PCMSs were characterized by their highly uniform spherical morphology and large open pores, which are fa- vorable for large protein delivery. An antimicrobial study of immunoglobulin Y （IgY）-loaded PCMSs revealed excellent antimicrobial activity against Streptococcus mutans. More importantly, they showed surprisingly rapid transformation to bone minerals in physiological medium. Evaluation of the in vitro efficacy of PCMSs in dentinal tubule occlusion demonstrated their powerful potential to serve as a catalyst in the repair of dental hard tissue. Therefore, the developed PCMSs show great promise as multifunctional biomaterials for dental treatment applications.展开更多
基金the National Natural Science Foundation of China(Grant No.50678100)
文摘In conventional reinforced soil structures,the reinforcements are often laid hori-zontally in the soil.In this paper,a new concept of soil reinforced with denti-strip inclusions was proposed and a series of laboratory model tests were carried out on sand retaining wall reinforced with denti-strip inclusions.Besides the horizontal displacements of the facing,the lateral earth pressures acting on vertical elements were measured.A microscopic measurement was performed to investigate the deformation and progressive failure of the sand within model retaining wall.Based on the image analytical technique,the bearing capability and interaction mechanism of reinforced sand retaining wall were analyzed.The model of the initial shear failure and potential failure surface were also put forward.From the experimental results,it is shown that denti-strip inclusions can increase the bearing capability of retaining wall significantly and restrict the facing displacements efficiently,as compared with conventional horizontal reinforcement.
基金supported by the National Natural Science Foundation ofChina (51402329 and 81500806)the Science Foundation for Youth Scholar of State Key Laboratory of High Performance Ceramics and Superfine Microstructures (SKL201404)Shanghai Excellent Academic Leaders Program (14XD1403800)
文摘Biomedical applications of porous calcium car- bonate （CaCO3） microspheres have been mainly restricted by their aqueous instability and low remineralization rate. To overcome these obstacles, a novel symmetry-breaking assembled porous calcite microsphere （PCMS） was con- structed in an ethanol/water mixed system using a two-step vapor-diffusion/aging crystallization strategy. In contrast to the conventional additive-induced crystallization method, the present strategy was performed under mild conditions and was free from any foreign additives, thus avoiding the potential contamination of the final product. Meanwhile, the prepared PCMSs were characterized by their highly uniform spherical morphology and large open pores, which are fa- vorable for large protein delivery. An antimicrobial study of immunoglobulin Y （IgY）-loaded PCMSs revealed excellent antimicrobial activity against Streptococcus mutans. More importantly, they showed surprisingly rapid transformation to bone minerals in physiological medium. Evaluation of the in vitro efficacy of PCMSs in dentinal tubule occlusion demonstrated their powerful potential to serve as a catalyst in the repair of dental hard tissue. Therefore, the developed PCMSs show great promise as multifunctional biomaterials for dental treatment applications.
