Zero mass flux jets, synthesized by acoustic actuators, have been used for the purpose of jet mixing enhancement and jet vectoring. Zero mass flux jets composed of entirely entrained fluid allow momentum transfer into...Zero mass flux jets, synthesized by acoustic actuators, have been used for the purpose of jet mixing enhancement and jet vectoring. Zero mass flux jets composed of entirely entrained fluid allow momentum transfer into the embedding flow. In the present experiments, miniature scale high aspect ratio actuator jets are placed along the long sides and near the exit plane of a primary two dimensional jet. In different modes, the primary jet can be vectored either towards or away from the actuator jets and the jet mixing is enhanced. The disturbance of the excitation frequency is developed while the unstable frequency of the primary jet is completely suppressed.展开更多
This research proposes a novel three-dimensional gravity inversion based on sparse recovery in compress sensing. Zero norm is selected as the objective function, which is then iteratively solved by the approximate zer...This research proposes a novel three-dimensional gravity inversion based on sparse recovery in compress sensing. Zero norm is selected as the objective function, which is then iteratively solved by the approximate zero norm solution. The inversion approach mainly employs forward modeling; a depth weight function is introduced into the objective function of the zero norms. Sparse inversion results are obtained by the corresponding optimal mathematical method. To achieve the practical geophysical and geological significance of the results, penalty function is applied to constrain the density values. Results obtained by proposed provide clear boundary depth and density contrast distribution information. The method's accuracy, validity, and reliability are verified by comparing its results with those of synthetic models. To further explain its reliability, a practical gravity data is obtained for a region in Texas, USA is applied. Inversion results for this region are compared with those of previous studies, including a research of logging data in the same area. The depth of salt dome obtained by the inversion method is 4.2 km, which is in good agreement with the 4.4 km value from the logging data. From this, the practicality of the inversion method is also validated.展开更多
The toxicity and degradation of hybrid lead-halide perovskites hinder their extensive applications.It is thus of great importance to explore non-toxic alternative materials with excellent stability and optoelectronic ...The toxicity and degradation of hybrid lead-halide perovskites hinder their extensive applications.It is thus of great importance to explore non-toxic alternative materials with excellent stability and optoelectronic property.We investigate the atomic structures and optoelectronic properties of non-toxic organic tin bromide perovskites(OTBP)with one/zerodimensional(1D/0D)structures by first-principles calculations.The calculated atomic structures show that the 1D/0D OTBPs are stable and the structure of inorganic octahedra in 0D is higher order than that in 1D.Moreover,the origination of exceptional purity emitting light in experiments is explained based on the calculated electronic structure.展开更多
In the past decade, researchers in the fields of energy production have concentrated on the improvement of new energy storage devices. Lithium-ion batteries(LIBs) and faradaic supercapacitors(FSs) have attracted speci...In the past decade, researchers in the fields of energy production have concentrated on the improvement of new energy storage devices. Lithium-ion batteries(LIBs) and faradaic supercapacitors(FSs) have attracted special attention as a result of the rapid development of new electrode nanomaterials, especially hybrid nanomaterials, which can meet the increasingly higher requirements for future energy, such as the capability to deliver high-power performance and an extremely long life cycle. In these hybrid nanostructures, a series of synergistic effects and unique properties arising from the combination of individual components are a major factor leading to improved charge/discharge capability, energy density, and system lifetime. This paper describes the most recent progress in the growth of hybrid electrode materials for LIBs and FSs systems, focusing on the combination of zero-dimensional(0 D), one-dimensional(1 D), two-dimensional(2 D), and three-dimensional(3 D) nanomaterials, respectively.展开更多
Under the frame of the (2+1)-dimensional zero curvature equation and Tu model, the (2+1)-dimensional dispersive long wave hierarchy is obtained. Furthermore, the loop algebra is expanded into a larger one. Moreover, a...Under the frame of the (2+1)-dimensional zero curvature equation and Tu model, the (2+1)-dimensional dispersive long wave hierarchy is obtained. Furthermore, the loop algebra is expanded into a larger one. Moreover, a class of integrable coupling system for dispersive long wave hierarchy and (2+1)-dimensional multi-component integrable system will be investigated.展开更多
CONSPECTUS:Polarization reflects the inherent properties of light.Circularly polarized light,in which the electric field rotates in a circle along the direction of propagation,contains rich optical information and exh...CONSPECTUS:Polarization reflects the inherent properties of light.Circularly polarized light,in which the electric field rotates in a circle along the direction of propagation,contains rich optical information and exhibits angle-independent characteristics.This feature makes it widely applicable in asymmetric synthesis,3D display,and light-emitting devices.Research on circularly polarized luminescence(CPL)has garnered significant attention in recent years.CPL-active materials range from small molecules to supermolecules and from chiral rare-earth complexes to nanosuperstructures.With advancements in developing new materials and technology in chiral science,this field has rapidly developed,and extensive efforts are focused on the development of CPL-active materials with both high photoluminescence quantum yield(PLQY)and large luminescence dissymmetry factor(g_(lum)).Among these materials,zerodimensional(0D)chiral hybrid metal halides(CHMHs)characterized by isolated inorganic polyhedra,which combine the chirality of organic cations with excellent photophysical properties of inorganic polyhedra,have emerged as a promising class of CPL-active materials.Despite recent advancements in the design and preparation of CPL-active 0D CHMHs,several challenges remain.Considering the demands of real applications,high PLQY,large glum value,and a range of CPL colors are all required.In this Account,we introduce our research on the design and applications of CPL-active 0D CHMHs.It is divided into three parts.First,we discuss the mechanism of CPL generation in 0D CHMHs,from which the chiral cations serve as chiral inducers and the inorganic units act as luminophores.We then expand the discussion to the delicate modulation of CPL in 0D CHMHs,highlighting the relationship between hydrogen bonds,inorganic octahedral distortion,and CPL performance.Additionally,multicolor CPL in bright yellow,green,and ultraviolet is achieved by incorporating different metal halides.In the third section,we introduce novel applications of ultraviolet CPL(UV-CPL)and CP-mechanoluminescence(CPML)in enantioselective polymerization and encryption,respectively.Lastly,we point out the challenges and future research directions in this field.We hope this Account provides novel insights into the key parameters determining CPL performance and inspires further synthesis of novel CHMHs with tailored CPL properties.展开更多
针对红外与可见光图像融合中的颜色失真和热目标细节丢失问题,提出基于融合曲线的零样本红外与可见光图像融合方法(Zero-Shot Infrared and Visible Image Fusion Based on Fusion Curve,ZSFuCu).首先,将融合任务转化为基于深度网络的...针对红外与可见光图像融合中的颜色失真和热目标细节丢失问题,提出基于融合曲线的零样本红外与可见光图像融合方法(Zero-Shot Infrared and Visible Image Fusion Based on Fusion Curve,ZSFuCu).首先,将融合任务转化为基于深度网络的图像特定曲线估计过程,通过像素级非线性映射实现热目标纹理的增强与色彩特征的保留.然后,设计多维度视觉感知损失函数,从对比度增强、颜色保持及空间连续性三个维度构建约束机制,协同优化融合图像的高频信息与色彩分布,保留结构特征和关键信息.最后,采用零样本训练策略,仅需单个红外与可见光图像对即可完成参数的自适应优化,具备在不同照明条件下融合的强鲁棒性.实验表明,ZSFuCu在目标突出性、细节丰富度及颜色自然度方面具有显著优势,兼具有效性与实用性.展开更多
文摘Zero mass flux jets, synthesized by acoustic actuators, have been used for the purpose of jet mixing enhancement and jet vectoring. Zero mass flux jets composed of entirely entrained fluid allow momentum transfer into the embedding flow. In the present experiments, miniature scale high aspect ratio actuator jets are placed along the long sides and near the exit plane of a primary two dimensional jet. In different modes, the primary jet can be vectored either towards or away from the actuator jets and the jet mixing is enhanced. The disturbance of the excitation frequency is developed while the unstable frequency of the primary jet is completely suppressed.
基金supported by the Development of airborne gravity gradiometer(No.2017YFC0601601)open subject of Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences(No.KLOR2018-8)
文摘This research proposes a novel three-dimensional gravity inversion based on sparse recovery in compress sensing. Zero norm is selected as the objective function, which is then iteratively solved by the approximate zero norm solution. The inversion approach mainly employs forward modeling; a depth weight function is introduced into the objective function of the zero norms. Sparse inversion results are obtained by the corresponding optimal mathematical method. To achieve the practical geophysical and geological significance of the results, penalty function is applied to constrain the density values. Results obtained by proposed provide clear boundary depth and density contrast distribution information. The method's accuracy, validity, and reliability are verified by comparing its results with those of synthetic models. To further explain its reliability, a practical gravity data is obtained for a region in Texas, USA is applied. Inversion results for this region are compared with those of previous studies, including a research of logging data in the same area. The depth of salt dome obtained by the inversion method is 4.2 km, which is in good agreement with the 4.4 km value from the logging data. From this, the practicality of the inversion method is also validated.
基金Project supported by the National Natural Science Foundation of China(Grant No.51972102).
文摘The toxicity and degradation of hybrid lead-halide perovskites hinder their extensive applications.It is thus of great importance to explore non-toxic alternative materials with excellent stability and optoelectronic property.We investigate the atomic structures and optoelectronic properties of non-toxic organic tin bromide perovskites(OTBP)with one/zerodimensional(1D/0D)structures by first-principles calculations.The calculated atomic structures show that the 1D/0D OTBPs are stable and the structure of inorganic octahedra in 0D is higher order than that in 1D.Moreover,the origination of exceptional purity emitting light in experiments is explained based on the calculated electronic structure.
基金supported by the Basic Science Research Program through the National Research Foundation of Korea funded by the Ministry of Education(NRF-2017R1D1A1A09000642)by a grant from the R&D Program of the Korea Railroad Research Institute (KRRI), Republic of Korea
文摘In the past decade, researchers in the fields of energy production have concentrated on the improvement of new energy storage devices. Lithium-ion batteries(LIBs) and faradaic supercapacitors(FSs) have attracted special attention as a result of the rapid development of new electrode nanomaterials, especially hybrid nanomaterials, which can meet the increasingly higher requirements for future energy, such as the capability to deliver high-power performance and an extremely long life cycle. In these hybrid nanostructures, a series of synergistic effects and unique properties arising from the combination of individual components are a major factor leading to improved charge/discharge capability, energy density, and system lifetime. This paper describes the most recent progress in the growth of hybrid electrode materials for LIBs and FSs systems, focusing on the combination of zero-dimensional(0 D), one-dimensional(1 D), two-dimensional(2 D), and three-dimensional(3 D) nanomaterials, respectively.
文摘Under the frame of the (2+1)-dimensional zero curvature equation and Tu model, the (2+1)-dimensional dispersive long wave hierarchy is obtained. Furthermore, the loop algebra is expanded into a larger one. Moreover, a class of integrable coupling system for dispersive long wave hierarchy and (2+1)-dimensional multi-component integrable system will be investigated.
基金supported by the National Natural Science Foundation of China(NSFC)(U24A2054,22375084)the Shenzhen Science and Technology Innovation Committee(RCJC202106091044441068)supported by the Center for Computational Science and Engineering at the Southern University of Science and Technology(SUSTech).
文摘CONSPECTUS:Polarization reflects the inherent properties of light.Circularly polarized light,in which the electric field rotates in a circle along the direction of propagation,contains rich optical information and exhibits angle-independent characteristics.This feature makes it widely applicable in asymmetric synthesis,3D display,and light-emitting devices.Research on circularly polarized luminescence(CPL)has garnered significant attention in recent years.CPL-active materials range from small molecules to supermolecules and from chiral rare-earth complexes to nanosuperstructures.With advancements in developing new materials and technology in chiral science,this field has rapidly developed,and extensive efforts are focused on the development of CPL-active materials with both high photoluminescence quantum yield(PLQY)and large luminescence dissymmetry factor(g_(lum)).Among these materials,zerodimensional(0D)chiral hybrid metal halides(CHMHs)characterized by isolated inorganic polyhedra,which combine the chirality of organic cations with excellent photophysical properties of inorganic polyhedra,have emerged as a promising class of CPL-active materials.Despite recent advancements in the design and preparation of CPL-active 0D CHMHs,several challenges remain.Considering the demands of real applications,high PLQY,large glum value,and a range of CPL colors are all required.In this Account,we introduce our research on the design and applications of CPL-active 0D CHMHs.It is divided into three parts.First,we discuss the mechanism of CPL generation in 0D CHMHs,from which the chiral cations serve as chiral inducers and the inorganic units act as luminophores.We then expand the discussion to the delicate modulation of CPL in 0D CHMHs,highlighting the relationship between hydrogen bonds,inorganic octahedral distortion,and CPL performance.Additionally,multicolor CPL in bright yellow,green,and ultraviolet is achieved by incorporating different metal halides.In the third section,we introduce novel applications of ultraviolet CPL(UV-CPL)and CP-mechanoluminescence(CPML)in enantioselective polymerization and encryption,respectively.Lastly,we point out the challenges and future research directions in this field.We hope this Account provides novel insights into the key parameters determining CPL performance and inspires further synthesis of novel CHMHs with tailored CPL properties.
文摘针对红外与可见光图像融合中的颜色失真和热目标细节丢失问题,提出基于融合曲线的零样本红外与可见光图像融合方法(Zero-Shot Infrared and Visible Image Fusion Based on Fusion Curve,ZSFuCu).首先,将融合任务转化为基于深度网络的图像特定曲线估计过程,通过像素级非线性映射实现热目标纹理的增强与色彩特征的保留.然后,设计多维度视觉感知损失函数,从对比度增强、颜色保持及空间连续性三个维度构建约束机制,协同优化融合图像的高频信息与色彩分布,保留结构特征和关键信息.最后,采用零样本训练策略,仅需单个红外与可见光图像对即可完成参数的自适应优化,具备在不同照明条件下融合的强鲁棒性.实验表明,ZSFuCu在目标突出性、细节丰富度及颜色自然度方面具有显著优势,兼具有效性与实用性.
