Compared with traditional cast-in-situ concrete slab culverts,prefabricated reinforced concrete slab culverts can be produced more quickly and has strong quality controllability,strong earthquake resistance,and repeat...Compared with traditional cast-in-situ concrete slab culverts,prefabricated reinforced concrete slab culverts can be produced more quickly and has strong quality controllability,strong earthquake resistance,and repeatability.They will be the primary production method of slab culverts in the future.This article offers a comprehensive review of the design and construction technology associated with prefabricated reinforced concrete slab culverts.The objective is to provide a valuable reference for related enterprises,enhance the quality of design and construction in precast pile configuration,and,in turn,contribute to the advancement of construction projects within our country.展开更多
Suburban sightseeing farm has always been restrained by such problems as focusing on form and visual effect, low design level, poor depth, similarity with others, poor sustainability and so on. This paper proposed maj...Suburban sightseeing farm has always been restrained by such problems as focusing on form and visual effect, low design level, poor depth, similarity with others, poor sustainability and so on. This paper proposed major characteristics of sightseeing farm design based on core connotations of behavior-driven design from the perspective of cognitive psychology. Cases were taken to analyze the design techniques of sightseeing farm, and it was concluded that sightseeing farm design based on behavior-driven perspective should orient to performancebased, refi ned, individualized and participatory from the four perspectives of highlighting functions, deepening the details, stressing originality, and optimizing experience, in order to provide new thoughts for solving existing problems of current sightseeing farm design.展开更多
A kind of three-dimensional flow-path of the ram-rotor was designed in this paper according to the design method of the typical supersonic intake of aircraft and missiles,especially the design method of the compressio...A kind of three-dimensional flow-path of the ram-rotor was designed in this paper according to the design method of the typical supersonic intake of aircraft and missiles,especially the design method of the compression ramp,the throat and the subsonic diffuser.The design Mach number of the flow-path was based on the averaged relative Mach number,regardless of the change of incoming Mach number along radial direction of the flow-path.Then,the flowfield of the designed flow-path was simulated numerically with computational fluid dynamics software at design point.The purpose of simulation was to obtain the details of the flowfield,including the structure of the shock wave system,position of flow separation zone,and so on.The performance of the ram-rotor was also evaluated.The numerical results show the structure of the shock wave system in the flow-path is similar to that in the supersonic intake.To improve the overall performance of the ram-rotor,the reasonable compromise between the total pressure ratio and the isentropic adiabatic efficiency should be reached.The structure optimization of the flow-path and the configuration of the shock wave system have great influence on the performance of the ram-rotor.展开更多
This paper presents a novel deep neural network for designated point tracking(DPT)in a monocular RGB video,VideoInNet.More concretely,the aim is to track four designated points correlated by a local homography on a te...This paper presents a novel deep neural network for designated point tracking(DPT)in a monocular RGB video,VideoInNet.More concretely,the aim is to track four designated points correlated by a local homography on a textureless planar region in the scene.DPT can be applied to augmented reality and video editing,especially in the field of video advertising.Existing methods predict the location of four designated points without appropriately considering the point correlation.To solve this problem,VideoInNet predicts the motion of the four designated points correlated by a local homography within the heatmap prediction framework.Our network refines the heatmaps of designated points through two stages.On the first stage,we introduce a context-aware and location-aware structure to learn a local homography for the designated plane in a supervised way.On the second stage,we introduce an iterative heatmap refinement module to improve the tracking accuracy.We propose a dataset focusing on textureless planar regions,named ScanDPT,for training and evaluation.We show that the error rate of VideoInNet is about 29%lower than that of the state-of-the-art approach when testing in the first 120 frames of testing videos on ScanDPT.展开更多
文摘Compared with traditional cast-in-situ concrete slab culverts,prefabricated reinforced concrete slab culverts can be produced more quickly and has strong quality controllability,strong earthquake resistance,and repeatability.They will be the primary production method of slab culverts in the future.This article offers a comprehensive review of the design and construction technology associated with prefabricated reinforced concrete slab culverts.The objective is to provide a valuable reference for related enterprises,enhance the quality of design and construction in precast pile configuration,and,in turn,contribute to the advancement of construction projects within our country.
文摘Suburban sightseeing farm has always been restrained by such problems as focusing on form and visual effect, low design level, poor depth, similarity with others, poor sustainability and so on. This paper proposed major characteristics of sightseeing farm design based on core connotations of behavior-driven design from the perspective of cognitive psychology. Cases were taken to analyze the design techniques of sightseeing farm, and it was concluded that sightseeing farm design based on behavior-driven perspective should orient to performancebased, refi ned, individualized and participatory from the four perspectives of highlighting functions, deepening the details, stressing originality, and optimizing experience, in order to provide new thoughts for solving existing problems of current sightseeing farm design.
基金Supported by National High-tech R&D Program(2007AA05Z255)
文摘A kind of three-dimensional flow-path of the ram-rotor was designed in this paper according to the design method of the typical supersonic intake of aircraft and missiles,especially the design method of the compression ramp,the throat and the subsonic diffuser.The design Mach number of the flow-path was based on the averaged relative Mach number,regardless of the change of incoming Mach number along radial direction of the flow-path.Then,the flowfield of the designed flow-path was simulated numerically with computational fluid dynamics software at design point.The purpose of simulation was to obtain the details of the flowfield,including the structure of the shock wave system,position of flow separation zone,and so on.The performance of the ram-rotor was also evaluated.The numerical results show the structure of the shock wave system in the flow-path is similar to that in the supersonic intake.To improve the overall performance of the ram-rotor,the reasonable compromise between the total pressure ratio and the isentropic adiabatic efficiency should be reached.The structure optimization of the flow-path and the configuration of the shock wave system have great influence on the performance of the ram-rotor.
基金the Key Research Projects of the Foundation Strengthening Program under Grant No.2020JCJQZD01412the National Natural Science Foundation of China under Grant No.61832016.
文摘This paper presents a novel deep neural network for designated point tracking(DPT)in a monocular RGB video,VideoInNet.More concretely,the aim is to track four designated points correlated by a local homography on a textureless planar region in the scene.DPT can be applied to augmented reality and video editing,especially in the field of video advertising.Existing methods predict the location of four designated points without appropriately considering the point correlation.To solve this problem,VideoInNet predicts the motion of the four designated points correlated by a local homography within the heatmap prediction framework.Our network refines the heatmaps of designated points through two stages.On the first stage,we introduce a context-aware and location-aware structure to learn a local homography for the designated plane in a supervised way.On the second stage,we introduce an iterative heatmap refinement module to improve the tracking accuracy.We propose a dataset focusing on textureless planar regions,named ScanDPT,for training and evaluation.We show that the error rate of VideoInNet is about 29%lower than that of the state-of-the-art approach when testing in the first 120 frames of testing videos on ScanDPT.
