There is a pressing demand for the development of novel birefringent crystals tailored for compact optical components,especially for crystals exhibiting large birefringence across a range of temperatures.This has comm...There is a pressing demand for the development of novel birefringent crystals tailored for compact optical components,especially for crystals exhibiting large birefringence across a range of temperatures.This has commonly been achieved by introducing various deformable groups with high polarizability anisotropy.In this study,we combined both rigid and deformable groups to synthesise a new birefringent crystal,Al_(2)Te_(2)MoO_(10),which demonstrates an exceptional birefringence value of 0.29@550 nm at room temperature.Not only is this higher birefringence than that of commercial crystals,but Al_(2)Te_(2)MoO_(10)exhibits excellent birefringence stability over a wide temperature range,from 123 to 503 K.In addition,the first-principles theory calculations and structural analyses suggest that although the rigid AlO_(6)groups do not make much contribution to the prominent birefringence,they nonetheless played a role in maintaining the structural anisotropy at elevated temperatures.Based on these findings,this paper proposes a novel structural design strategy to complement conventional approaches for developing optimal birefringent crystals under various environmental conditions.展开更多
This paper presents a numerical study of the hydroelastic coupling during the free-surface water entry of deformable spheres of different material densities.The focus is on the hydrodynamic forces,the stress loads,the...This paper presents a numerical study of the hydroelastic coupling during the free-surface water entry of deformable spheres of different material densities.The focus is on the hydrodynamic forces,the stress loads,the sphere deformations,the wetted areas of the sphere and the cavity dynamics,including the impacting of the elastic spheres and the hydroelastic coupled behaviors in the free surface flows.It is shown that the elastic wave propagation in the sphere scales with the sphere density.For elastic spheres immersed in the water,the variation of the sphere deformations and its energy transformation mechanism are discussed.From the contact point positions of the cavity,it can be seen that the wetted area of the sphere is closely related with the sphere deformation.The first deformation cycle is a turning point in the relation between the wetted area and the sphere density.Based on the map of m*−ηsummarized in this work,the influence of the sphere deformation on the shape of the cavity can be roughly predicted from the material properties and the impact conditions.展开更多
Front bumper, crash box and side rail are key body structural parts in front crash. Deformation space is affected by compartment packaging. The improvement suggestions are proposed to solve the problems existed in the...Front bumper, crash box and side rail are key body structural parts in front crash. Deformation space is affected by compartment packaging. The improvement suggestions are proposed to solve the problems existed in the current vehicle struc- ture and compartment packaging based on the areas that influence performance of automobile offset deformable barrier impact, such as the side rail, mounting, storage battery packaging,etc. It is proved that dO % offset crash simulation result of one certain car is well-correlated with the physical test. Optimization cases meet the crash performance requirements. The objec- tive of the analysis is to guide structural design and improves a car＇ s crash safety performance.展开更多
基金supported by the National Natural Science Foundation of China(22122507,61975207,22193042,21833010,and 21921001)the Natural Science Foundation of Fujian Province(2022J02012)+2 种基金the Youth Innovation Promotion Association of the Chinese Academy of Sciences(Y202069)the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(ZDBS-LYSLH024)the China Postdoctoral Science Foundation(2023M743498)。
文摘There is a pressing demand for the development of novel birefringent crystals tailored for compact optical components,especially for crystals exhibiting large birefringence across a range of temperatures.This has commonly been achieved by introducing various deformable groups with high polarizability anisotropy.In this study,we combined both rigid and deformable groups to synthesise a new birefringent crystal,Al_(2)Te_(2)MoO_(10),which demonstrates an exceptional birefringence value of 0.29@550 nm at room temperature.Not only is this higher birefringence than that of commercial crystals,but Al_(2)Te_(2)MoO_(10)exhibits excellent birefringence stability over a wide temperature range,from 123 to 503 K.In addition,the first-principles theory calculations and structural analyses suggest that although the rigid AlO_(6)groups do not make much contribution to the prominent birefringence,they nonetheless played a role in maintaining the structural anisotropy at elevated temperatures.Based on these findings,this paper proposes a novel structural design strategy to complement conventional approaches for developing optimal birefringent crystals under various environmental conditions.
基金Projects supported by the National Natural Science Foundation of China(Grant Nos.11972138,11672094).
文摘This paper presents a numerical study of the hydroelastic coupling during the free-surface water entry of deformable spheres of different material densities.The focus is on the hydrodynamic forces,the stress loads,the sphere deformations,the wetted areas of the sphere and the cavity dynamics,including the impacting of the elastic spheres and the hydroelastic coupled behaviors in the free surface flows.It is shown that the elastic wave propagation in the sphere scales with the sphere density.For elastic spheres immersed in the water,the variation of the sphere deformations and its energy transformation mechanism are discussed.From the contact point positions of the cavity,it can be seen that the wetted area of the sphere is closely related with the sphere deformation.The first deformation cycle is a turning point in the relation between the wetted area and the sphere density.Based on the map of m*−ηsummarized in this work,the influence of the sphere deformation on the shape of the cavity can be roughly predicted from the material properties and the impact conditions.
基金"Twelfth Five-year Plan"for Sci & Tech Research of China(No.2011BAG03B02No.2011BAG03B06)
文摘Front bumper, crash box and side rail are key body structural parts in front crash. Deformation space is affected by compartment packaging. The improvement suggestions are proposed to solve the problems existed in the current vehicle struc- ture and compartment packaging based on the areas that influence performance of automobile offset deformable barrier impact, such as the side rail, mounting, storage battery packaging,etc. It is proved that dO % offset crash simulation result of one certain car is well-correlated with the physical test. Optimization cases meet the crash performance requirements. The objec- tive of the analysis is to guide structural design and improves a car＇ s crash safety performance.
