It is generally believed in academia that there are two theoretical explanations of tunneling and financing advantage for the creation of pyramidal structure. However, there is no definitive conclusion on which explan...It is generally believed in academia that there are two theoretical explanations of tunneling and financing advantage for the creation of pyramidal structure. However, there is no definitive conclusion on which explanation holds sway. Based on non-equilibrium panel data of seven years between 2004 and 2010, this empirical study uses the product market competition variables of ＂inter-sector competition＂ and ＂intra-sector competition＂ and the hierarchy and complexity of pyramidal structure, examines the correlation between pyramidal structure of Chinese private manufacturing listed firms and product market competition and patterns of change, and reveals the major causes of pyramidal structure. Empirical result indicates that, for Chinese private manufacturing listed companies, there is a significant negative correlation between product market competition and the hierarchy and complexity of pyramidal structure, which indicates that the creation of pyramidal structure has a preference on tunneling by controlling shareholders. On the basis of further considerations on corporate tunneling and financing restraint categorization, high-tunneling firms and firms with low financing restraint demonstrate significant tunneling motivations; low-tunneling firms and firms with high financing restraint demonstrate significant effect of financing advantage, which further testifies both theoretical explanations for the creation of pyramidal structure. Conclusions of these studies have not only enriched and supplemented relevant studies on the root causes for the creation of pyramidal structure by Chinese private business groups, but provide practical support for firms to make correct and effective use of pyramidal structure as well.展开更多
Germanium(Ge)-air battery,a new type of semiconductor-air battery,has garnered increasing attention owing to its environmental friendliness,safety,and excellent dynamic performance.However,the flat Ge anode is prone t...Germanium(Ge)-air battery,a new type of semiconductor-air battery,has garnered increasing attention owing to its environmental friendliness,safety,and excellent dynamic performance.However,the flat Ge anode is prone to passivation,owing to GeO_(2) accumulation on its surface,resulting in premature discharge termination.In this study,various nano-Ge pyramid structures(GePS)were prepared using chemical etching(CE)and metal-assisted chemical etching(MACE)methods to enhance the specific surface area of the Ge anode,thereby facilitating the dissolution of the passivation layer.This study revealed that the MACE method significantly accelerated the etching rate of the Ge surface,producing exceptional GePS.Furthermore,Ge-air batteries employing Ge anodes prepared using MACE demonstrated an exceptional discharge life of up to 9240 h(385 days).The peak power density reached 3.03mW/cm^(2),representing improvements of more than 2 times and 1.8 times,respectively,compared with batteries using flat Ge anodes.This study presents a straightforward approach to enhance Ge anode performance,thereby expanding the potential applications of Ge-air batteries.展开更多
A novel multiresolution pyramidal edge detector, based on adaptive weighted fuzzy mean(AWFM)filtering and fuzzy linking model, is presented in this paper. The algorithm first constructs a pyramidal structure by repeti...A novel multiresolution pyramidal edge detector, based on adaptive weighted fuzzy mean(AWFM)filtering and fuzzy linking model, is presented in this paper. The algorithm first constructs a pyramidal structure by repetitive AWFM filtering and subsampling of original image. Then it utilizes multiple heuristic linking criteria between the edge nodes of two adjacent levels and considers the linkage as a fuzzy model, which is trained offline. Through this fuzzy linking model, the boundaries detected at coarse resolution are propagated and refined to the bottom level from the coarse-to fine edge detection. The validation experiment results demonstrate that the proposed approach has superior performance compared with standard fixed resolution detector andprevious multiresolution approach, especially in impulse noise environment.展开更多
This paper mainly explores the architectural form of the interior of Maiji Mountain’s Cave 4 and the spiritual realm it establishes.Previous research holds the view that the niche within Cave 4 is architecturally mod...This paper mainly explores the architectural form of the interior of Maiji Mountain’s Cave 4 and the spiritual realm it establishes.Previous research holds the view that the niche within Cave 4 is architecturally modeled after a tent-like structure.However,after in-depth research,this paper suggests that the niche in Cave 4 is more of an imitation of an embedded stupa,or rather,it reconstructs the stupa in an embedded form within the cave.In prior studies,analysis historical background and architectural details of Cave 4 remains inadequate,thus,this paper aims to take a thorough investigation on this point,and further clarify the significance of the form of the Buddha niche in Cave 4,as well as its construction design origins.Specifically,the octagonal wooden-imitating column,lotus-shaped clamp,inverted lotus pedestal,five lotus petals,and shadow sculptures within the niche,the shallow-relief ceiling and small platform outside the niche,as well as the banana leaf decorations,all suggest that the architectural form Cave 4 imitates is likely a single-story wooden stupa.In this way,the connection that this embedded stupa creates between the Budda and the faithful,is more direct and intimate,especially compared to the one built in traditional Buddhist activities.Moreover,by coordinating with various visual materials inside the cave,such as the layout of the Dharma assembly and the exquisite details of the Buddha images,it reconstructs the“realm of the mind”in Buddhism,reinforcing the faithful’s dual experience both in physical and spiritual fields.The Master Teacher Studio of basic education came into being with the new curriculum reform,which has become a new mechanism for the construction of teaching staff in social situations in China.As a brand-new way in the construction of teaching staff in the new era,through reviewing the relevant research,it is found that the focus of academic circles on Master Teacher Studio is mainly in four aspects:clarifying the conceptual boundary,seeking theoretical support,defining the functional orientation,and exploring status quo of development.The exploration of the research process is not only a process of summary but also a process of reflection.By reviewing relevant research,reflecting on the problems that have appeared in the process of building the Master Teacher Studio in basic education,clarify the development path of the Master Teacher Studio and further affirm its advantages to the construction of teaching staff in the Chinese context.展开更多
Flame-retardant materials with good electromagnetic wave absorption play an increasingly important role in Over-the-Air(OTA)tests in microwave anechoic chambers.In this work,carbon nanotubes and ammonium polyphosphate...Flame-retardant materials with good electromagnetic wave absorption play an increasingly important role in Over-the-Air(OTA)tests in microwave anechoic chambers.In this work,carbon nanotubes and ammonium polyphosphate(CNTs@APP)composite were prepared by crosslinking with the silane coupling agent(KH550).The flame retardancy is improved with the increase of APP.However,the microwave absorption performance(MAP)and processing difficulty changed greatly as well.Therefore,magnesium aluminum double-layer metal hydroxide(LDH)was obtained by coprecipitation method and processing into the coating,so as to realize flame retardancy which reaches the limiting oxygen index(LOI)of 24.8%and good MAP at the same time.Then,a high-frequency structure simulator(HFSS^(TM))was used to simulate the pyramid model to realize the broadband absorption,and the optimal parameter range was obtained,that is,when the total height of the material is 40 mm,the height of the base accounts for 1/5-1/3,and the tangent of the half top angle is near 1/5,which result in the best MAP.Finally,the broadband absorption of 14.36 GHz(3.64-18 GHz)was realized when the base height is 1/3,and the broadband absorption of 14 GHz(4-18 GHz)can be realized under the condition of large-angle oblique incidence of 0°-60°.展开更多
This paper focuses on the effect of temperature on the out-of-plane compressive properties and failure mechanism of carbon fiber/epoxy composite pyramidal truss cores sandwich panels （CF/CPTSP）. CFJCPTSP with novel ...This paper focuses on the effect of temperature on the out-of-plane compressive properties and failure mechanism of carbon fiber/epoxy composite pyramidal truss cores sandwich panels （CF/CPTSP）. CFJCPTSP with novel reinforced frames are manufactured by the water jet cutting and interlocking assembly method in this paper. The theoretical analysis is presented to predict the out-of-plane compressive stiffness and strength of CFJCPTSP at different ambient temperatures. The tests of composite sandwich panels are per- formed throughout the temperature range from -90℃ to 180℃. Good agreement is found between theo- retical predictions and experimental measurements. Experimental results indicate that the low tempera- ture increases the compressive stiffness and strength of CF/CPTSP. However, the high temperature causes the degradation of the compressive stiffness and strength. Meanwhile, the effects of temperature on the failure mode of composite sandwich panels are also observed.展开更多
Stab resistance body armor（SRBA）is essential in protecting people from knife injuries.The protective parts of traditional SRBA are made of multi-layered ultra-high molecular weight polyethylene（UHMWPE）,which cause...Stab resistance body armor（SRBA）is essential in protecting people from knife injuries.The protective parts of traditional SRBA are made of multi-layered ultra-high molecular weight polyethylene（UHMWPE）,which causes heavy heat stress for people wearing it.The protective parts of SRBA manufactured using laser sintering（LS）3D printing technology provide high manufacturing flexibility and low weight.Two different structures,plain plate and pyramid-structured plate,were investigated.The pyramid structure showed much higher stab resistance property then the plain plate,because of the angle and thickness effects.This is the first effort applying the LS technology and polyamide（PA）material（PA3200）on SRBA.By applying the pyramid structure on the protective layer of the SRBA,the total weight could reduce 30%-40%.展开更多
Droplet splitting technology presents considerable potential for advancing applica-tions in sample encapsulation,manipulation,chemical reaction control,and preci-sion measurement systems.However,existing methodologies...Droplet splitting technology presents considerable potential for advancing applica-tions in sample encapsulation,manipulation,chemical reaction control,and preci-sion measurement systems.However,existing methodologies frequently encounter limitations related to complex operation and high cost.To address the need for controllable,high-precision,and cost-efficient droplet splitting,this study combines three-dimensional printing technology with superhydrophobic surface modification to fabricate pyramid microstructures with customized splitting functionalities.The pyramidal sharp edges act as“fluidic blades”to split droplets through the synergistic interaction of edge-induced capillary forces and inertial forces generated at the liquid film periphery during spreading dynamics.Upon penetration by the pyramid apex,the droplet forms an annular liquid ring that subsequently fragments into sub-droplets,enabling programmable splitting.A comprehensive experimental and computational framework was developed to investigate splitting dynamics,force distribution pat-terns,and geometric dependence of pyramid structures on splitting performance.Results indicate that increased Weber numbers,larger droplet volumes,and reduced pyramid apex angles markedly improve splitting controllability.Additionally,six-and 12-sided pyramid-based splitting/collection devices were engineered to demonstrate practical implementations,including on-demand droplet splitting and liquid marble synthesis.This work establishes a scalable,low-cost platform for precision droplet manipulation with significant implications for microfluidic devices and lab-on-a-chip technologies.展开更多
The infrared absorption spectra of different superconducting phase of high Tc super conductor Bi-Sb-Sr-Ca-Cu-O have been measured . The results show that only in the range of 400cm-1 -700cm-1,there is a group of peaks...The infrared absorption spectra of different superconducting phase of high Tc super conductor Bi-Sb-Sr-Ca-Cu-O have been measured . The results show that only in the range of 400cm-1 -700cm-1,there is a group of peaks which changes with different superconducting phases.According to group theory and infrared spectra of CuO, this group of peaks could be assigned to be the [CuO6]octahedron, the [CuO5] pyramid and the [CuO4]plane quadrilateral,but not CU-O plane or CU-O chain. Furthermore, the quasi-three dimensional Cu-O layers consisting of [CuO5] pyramids and proper coupling between them are essential factor for high Tc. It seems that the weaker compling of layers, the higher Tc展开更多
Significant progress has been made in image inpainting methods in recent years.However,they are incapable of producing inpainting results with reasonable structures,rich detail,and sharpness at the same time.In this p...Significant progress has been made in image inpainting methods in recent years.However,they are incapable of producing inpainting results with reasonable structures,rich detail,and sharpness at the same time.In this paper,we propose the Pyramid-VAE-GAN network for image inpainting to address this limitation.Our network is built on a variational autoencoder(VAE)backbone that encodes high-level latent variables to represent complicated high-dimensional prior distributions of images.The prior assists in reconstructing reasonable structures when inpainting.We also adopt a pyramid structure in our model to maintain rich detail in low-level latent variables.To avoid the usual incompatibility of requiring both reasonable structures and rich detail,we propose a novel cross-layer latent variable transfer module.This transfers information about long-range structures contained in high-level latent variables to low-level latent variables representing more detailed information.We further use adversarial training to select the most reasonable results and to improve the sharpness of the images.Extensive experimental results on multiple datasets demonstrate the superiority of our method.Our code is available at https://github.com/thy960112/Pyramid-VAE-GAN.展开更多
文摘It is generally believed in academia that there are two theoretical explanations of tunneling and financing advantage for the creation of pyramidal structure. However, there is no definitive conclusion on which explanation holds sway. Based on non-equilibrium panel data of seven years between 2004 and 2010, this empirical study uses the product market competition variables of ＂inter-sector competition＂ and ＂intra-sector competition＂ and the hierarchy and complexity of pyramidal structure, examines the correlation between pyramidal structure of Chinese private manufacturing listed firms and product market competition and patterns of change, and reveals the major causes of pyramidal structure. Empirical result indicates that, for Chinese private manufacturing listed companies, there is a significant negative correlation between product market competition and the hierarchy and complexity of pyramidal structure, which indicates that the creation of pyramidal structure has a preference on tunneling by controlling shareholders. On the basis of further considerations on corporate tunneling and financing restraint categorization, high-tunneling firms and firms with low financing restraint demonstrate significant tunneling motivations; low-tunneling firms and firms with high financing restraint demonstrate significant effect of financing advantage, which further testifies both theoretical explanations for the creation of pyramidal structure. Conclusions of these studies have not only enriched and supplemented relevant studies on the root causes for the creation of pyramidal structure by Chinese private business groups, but provide practical support for firms to make correct and effective use of pyramidal structure as well.
基金financially supported by the National Natural Science Foundation of China(No.61904073)Spring City Plan-Special Program for Young Talents(No.K202005007)+2 种基金Yunnan Talents Support Plan for Yong Talents(No.XDYC-QNRC-2022-0482)Yunnan Local Colleges Applied Basic Research Projects(No.202101BA070001-138)Frontier Research Team of Kunming University 2023.
文摘Germanium(Ge)-air battery,a new type of semiconductor-air battery,has garnered increasing attention owing to its environmental friendliness,safety,and excellent dynamic performance.However,the flat Ge anode is prone to passivation,owing to GeO_(2) accumulation on its surface,resulting in premature discharge termination.In this study,various nano-Ge pyramid structures(GePS)were prepared using chemical etching(CE)and metal-assisted chemical etching(MACE)methods to enhance the specific surface area of the Ge anode,thereby facilitating the dissolution of the passivation layer.This study revealed that the MACE method significantly accelerated the etching rate of the Ge surface,producing exceptional GePS.Furthermore,Ge-air batteries employing Ge anodes prepared using MACE demonstrated an exceptional discharge life of up to 9240 h(385 days).The peak power density reached 3.03mW/cm^(2),representing improvements of more than 2 times and 1.8 times,respectively,compared with batteries using flat Ge anodes.This study presents a straightforward approach to enhance Ge anode performance,thereby expanding the potential applications of Ge-air batteries.
文摘A novel multiresolution pyramidal edge detector, based on adaptive weighted fuzzy mean(AWFM)filtering and fuzzy linking model, is presented in this paper. The algorithm first constructs a pyramidal structure by repetitive AWFM filtering and subsampling of original image. Then it utilizes multiple heuristic linking criteria between the edge nodes of two adjacent levels and considers the linkage as a fuzzy model, which is trained offline. Through this fuzzy linking model, the boundaries detected at coarse resolution are propagated and refined to the bottom level from the coarse-to fine edge detection. The validation experiment results demonstrate that the proposed approach has superior performance compared with standard fixed resolution detector andprevious multiresolution approach, especially in impulse noise environment.
文摘This paper mainly explores the architectural form of the interior of Maiji Mountain’s Cave 4 and the spiritual realm it establishes.Previous research holds the view that the niche within Cave 4 is architecturally modeled after a tent-like structure.However,after in-depth research,this paper suggests that the niche in Cave 4 is more of an imitation of an embedded stupa,or rather,it reconstructs the stupa in an embedded form within the cave.In prior studies,analysis historical background and architectural details of Cave 4 remains inadequate,thus,this paper aims to take a thorough investigation on this point,and further clarify the significance of the form of the Buddha niche in Cave 4,as well as its construction design origins.Specifically,the octagonal wooden-imitating column,lotus-shaped clamp,inverted lotus pedestal,five lotus petals,and shadow sculptures within the niche,the shallow-relief ceiling and small platform outside the niche,as well as the banana leaf decorations,all suggest that the architectural form Cave 4 imitates is likely a single-story wooden stupa.In this way,the connection that this embedded stupa creates between the Budda and the faithful,is more direct and intimate,especially compared to the one built in traditional Buddhist activities.Moreover,by coordinating with various visual materials inside the cave,such as the layout of the Dharma assembly and the exquisite details of the Buddha images,it reconstructs the“realm of the mind”in Buddhism,reinforcing the faithful’s dual experience both in physical and spiritual fields.The Master Teacher Studio of basic education came into being with the new curriculum reform,which has become a new mechanism for the construction of teaching staff in social situations in China.As a brand-new way in the construction of teaching staff in the new era,through reviewing the relevant research,it is found that the focus of academic circles on Master Teacher Studio is mainly in four aspects:clarifying the conceptual boundary,seeking theoretical support,defining the functional orientation,and exploring status quo of development.The exploration of the research process is not only a process of summary but also a process of reflection.By reviewing relevant research,reflecting on the problems that have appeared in the process of building the Master Teacher Studio in basic education,clarify the development path of the Master Teacher Studio and further affirm its advantages to the construction of teaching staff in the Chinese context.
基金financially supported by the National Nature Science Foundation of China(No.51971111)the Foundation of National Defense Science and Technology Key Laboratory(No.6142908-KQ111501114)。
文摘Flame-retardant materials with good electromagnetic wave absorption play an increasingly important role in Over-the-Air(OTA)tests in microwave anechoic chambers.In this work,carbon nanotubes and ammonium polyphosphate(CNTs@APP)composite were prepared by crosslinking with the silane coupling agent(KH550).The flame retardancy is improved with the increase of APP.However,the microwave absorption performance(MAP)and processing difficulty changed greatly as well.Therefore,magnesium aluminum double-layer metal hydroxide(LDH)was obtained by coprecipitation method and processing into the coating,so as to realize flame retardancy which reaches the limiting oxygen index(LOI)of 24.8%and good MAP at the same time.Then,a high-frequency structure simulator(HFSS^(TM))was used to simulate the pyramid model to realize the broadband absorption,and the optimal parameter range was obtained,that is,when the total height of the material is 40 mm,the height of the base accounts for 1/5-1/3,and the tangent of the half top angle is near 1/5,which result in the best MAP.Finally,the broadband absorption of 14.36 GHz(3.64-18 GHz)was realized when the base height is 1/3,and the broadband absorption of 14 GHz(4-18 GHz)can be realized under the condition of large-angle oblique incidence of 0°-60°.
基金supported by the Major State Basic Research Development Program of China (973 Program) under Grant No. 2011CB610303the National Natural Science Foundation of China under Grant No. 11432004
文摘This paper focuses on the effect of temperature on the out-of-plane compressive properties and failure mechanism of carbon fiber/epoxy composite pyramidal truss cores sandwich panels （CF/CPTSP）. CFJCPTSP with novel reinforced frames are manufactured by the water jet cutting and interlocking assembly method in this paper. The theoretical analysis is presented to predict the out-of-plane compressive stiffness and strength of CFJCPTSP at different ambient temperatures. The tests of composite sandwich panels are per- formed throughout the temperature range from -90℃ to 180℃. Good agreement is found between theo- retical predictions and experimental measurements. Experimental results indicate that the low tempera- ture increases the compressive stiffness and strength of CF/CPTSP. However, the high temperature causes the degradation of the compressive stiffness and strength. Meanwhile, the effects of temperature on the failure mode of composite sandwich panels are also observed.
基金Supported by the Independent Research Project of State Key Laboratory of Explosion Science and Technology(YBKT16-13)Beijing Institute of Technology Research Fund Program for Young Scholars(2-205205-2014)National Key Rsearch Program(2016YFC0802801-4)
文摘Stab resistance body armor（SRBA）is essential in protecting people from knife injuries.The protective parts of traditional SRBA are made of multi-layered ultra-high molecular weight polyethylene（UHMWPE）,which causes heavy heat stress for people wearing it.The protective parts of SRBA manufactured using laser sintering（LS）3D printing technology provide high manufacturing flexibility and low weight.Two different structures,plain plate and pyramid-structured plate,were investigated.The pyramid structure showed much higher stab resistance property then the plain plate,because of the angle and thickness effects.This is the first effort applying the LS technology and polyamide（PA）material（PA3200）on SRBA.By applying the pyramid structure on the protective layer of the SRBA,the total weight could reduce 30%-40%.
基金National Natural Science Foundation of China,Grant/Award Numbers:U23A20632,52275420National Key R&D Programof China,Grant/Award Number:2022YFB3403304。
文摘Droplet splitting technology presents considerable potential for advancing applica-tions in sample encapsulation,manipulation,chemical reaction control,and preci-sion measurement systems.However,existing methodologies frequently encounter limitations related to complex operation and high cost.To address the need for controllable,high-precision,and cost-efficient droplet splitting,this study combines three-dimensional printing technology with superhydrophobic surface modification to fabricate pyramid microstructures with customized splitting functionalities.The pyramidal sharp edges act as“fluidic blades”to split droplets through the synergistic interaction of edge-induced capillary forces and inertial forces generated at the liquid film periphery during spreading dynamics.Upon penetration by the pyramid apex,the droplet forms an annular liquid ring that subsequently fragments into sub-droplets,enabling programmable splitting.A comprehensive experimental and computational framework was developed to investigate splitting dynamics,force distribution pat-terns,and geometric dependence of pyramid structures on splitting performance.Results indicate that increased Weber numbers,larger droplet volumes,and reduced pyramid apex angles markedly improve splitting controllability.Additionally,six-and 12-sided pyramid-based splitting/collection devices were engineered to demonstrate practical implementations,including on-demand droplet splitting and liquid marble synthesis.This work establishes a scalable,low-cost platform for precision droplet manipulation with significant implications for microfluidic devices and lab-on-a-chip technologies.
文摘The infrared absorption spectra of different superconducting phase of high Tc super conductor Bi-Sb-Sr-Ca-Cu-O have been measured . The results show that only in the range of 400cm-1 -700cm-1,there is a group of peaks which changes with different superconducting phases.According to group theory and infrared spectra of CuO, this group of peaks could be assigned to be the [CuO6]octahedron, the [CuO5] pyramid and the [CuO4]plane quadrilateral,but not CU-O plane or CU-O chain. Furthermore, the quasi-three dimensional Cu-O layers consisting of [CuO5] pyramids and proper coupling between them are essential factor for high Tc. It seems that the weaker compling of layers, the higher Tc
基金The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China(Grant No.61925603).
文摘Significant progress has been made in image inpainting methods in recent years.However,they are incapable of producing inpainting results with reasonable structures,rich detail,and sharpness at the same time.In this paper,we propose the Pyramid-VAE-GAN network for image inpainting to address this limitation.Our network is built on a variational autoencoder(VAE)backbone that encodes high-level latent variables to represent complicated high-dimensional prior distributions of images.The prior assists in reconstructing reasonable structures when inpainting.We also adopt a pyramid structure in our model to maintain rich detail in low-level latent variables.To avoid the usual incompatibility of requiring both reasonable structures and rich detail,we propose a novel cross-layer latent variable transfer module.This transfers information about long-range structures contained in high-level latent variables to low-level latent variables representing more detailed information.We further use adversarial training to select the most reasonable results and to improve the sharpness of the images.Extensive experimental results on multiple datasets demonstrate the superiority of our method.Our code is available at https://github.com/thy960112/Pyramid-VAE-GAN.
