设计了玉米植株的特定调查项目和计算机数据管理,编制出了专门的绘图系统(Ma-jze Drawing Structure System MDSS)。该系统根据田间调查的数据可绘制出4种直观的图形:①植株形状图;②不同叶位叶片的干蠡和面积图;③茎距离叶面积分布图;...设计了玉米植株的特定调查项目和计算机数据管理,编制出了专门的绘图系统(Ma-jze Drawing Structure System MDSS)。该系统根据田间调查的数据可绘制出4种直观的图形:①植株形状图;②不同叶位叶片的干蠡和面积图;③茎距离叶面积分布图;④植株层切面积垂直分布图。4个品种的材料分析表明,这种植株形态特征的研究方法能全面、具体地使植株形态特征定量化、并可直观分析。且不破坏植株进行群体结构的分析。展开更多
A new finite element model for single-layered strand was investigated for accurate and efficient mechanical behavior analysis.Mathematical model was created by sectional path-nodes sweeping and dynamic node-beam mappi...A new finite element model for single-layered strand was investigated for accurate and efficient mechanical behavior analysis.Mathematical model was created by sectional path-nodes sweeping and dynamic node-beam mapping.Geometric relations between nodes in center core wire and helical wires were deduced in tension and bending incorporating material elasticity theory and deformation geometrical compatibility.Based on Timoshenko beam theory,strand of a pitch length was modeled with specific material,geometric parameters and synthesized constraint equations defined in ANSYS software,and predetermined load cases were performed.The obtained results show that discrepancies between suggested method and Costello theory do not exceed 1.51% in tension and 6.21% in bending,which verifies the correctness and accuracy of the suggested finite element model in predicting mechanical behavior of single-layered wire strand.展开更多
The paintings in the Yuan Dynasty, because oft.heir unique characteristics of the times, have made a deep and superexcellent track in the history of the Chinese painting, among which the literati landscape paintings r...The paintings in the Yuan Dynasty, because oft.heir unique characteristics of the times, have made a deep and superexcellent track in the history of the Chinese painting, among which the literati landscape paintings represented the subject of the paintings in the Yuan Dynasty. And in the literati paintings, Ni Zan＇s paintings are the most representative. The application of the pen and ink in his works is concise and thinly scattered, and the artistic conception is cold and desolate. In this paper, with ＂Map of a fishing village in an autumn sunny day after the rain＂ as an example, the author analyzes Ni Zan＇s painting style and the causes of its formation.展开更多
The numerical simulation on drawing process of automotive B-pillar was carried out on AutoForm software,and dangerous forming areas were discovered.The processing parameters,such as the layout of drawbeads,blank holdi...The numerical simulation on drawing process of automotive B-pillar was carried out on AutoForm software,and dangerous forming areas were discovered.The processing parameters,such as the layout of drawbeads,blank holding force and the shape of blank,were adjusted and optimized according to the simulation results.Results indicate that the quality defects can be forecast and removed,which improves the stability of forming process.The cost of design is decreased and the research cycle is shortened.It is proved that the drawing process and die design of B-pillar forming are feasible in actual production.展开更多
This paper describes the experimental analysis of eye-movement during the generation of a trajectory by the human upper limb, carried out to elucidate the human mechanism for visual-information recognition. The result...This paper describes the experimental analysis of eye-movement during the generation of a trajectory by the human upper limb, carried out to elucidate the human mechanism for visual-information recognition. The results showed that the subjects adopted an eye-movement pattern called the subgoal travel method （fixating in the vicinity of the fingertip while drawing/tracing） for the complete circle. Subsequently, when the target trajectory was one of incomplete shapes, some subjects continued following the subgoal travel method by drawing the missing part of the target trajectory, while others followed two other eye-movement patterns. The first is called the center-point fixation method, in which subjects consider the center point as the most important point for generating the target-image trajectory, and therefore, fix their gaze at the center point throughout the experiment. The second is called the point-to-point travel method, in which the subjects＇ gazes shift between the center point of a displayed image and their fingertip. Further, the results confirmed that the eye-movement pattern, movement accuracy, and drawing speed are correlated. Additional experiments clarified the conditions for which different eye-movement patterns are suitable： the subgoal travel method is suitable for high-accuracy drawing; the center-point fixation method is suitable for higher-sneed drawing展开更多
文摘设计了玉米植株的特定调查项目和计算机数据管理,编制出了专门的绘图系统(Ma-jze Drawing Structure System MDSS)。该系统根据田间调查的数据可绘制出4种直观的图形:①植株形状图;②不同叶位叶片的干蠡和面积图;③茎距离叶面积分布图;④植株层切面积垂直分布图。4个品种的材料分析表明,这种植株形态特征的研究方法能全面、具体地使植株形态特征定量化、并可直观分析。且不破坏植株进行群体结构的分析。
基金Project(2009J007)supported by Science and Technology Department of Railway Ministry of ChinaProject(U1134203)supported by Joint Fund of High-speed Railway Fundamental Research,China
文摘A new finite element model for single-layered strand was investigated for accurate and efficient mechanical behavior analysis.Mathematical model was created by sectional path-nodes sweeping and dynamic node-beam mapping.Geometric relations between nodes in center core wire and helical wires were deduced in tension and bending incorporating material elasticity theory and deformation geometrical compatibility.Based on Timoshenko beam theory,strand of a pitch length was modeled with specific material,geometric parameters and synthesized constraint equations defined in ANSYS software,and predetermined load cases were performed.The obtained results show that discrepancies between suggested method and Costello theory do not exceed 1.51% in tension and 6.21% in bending,which verifies the correctness and accuracy of the suggested finite element model in predicting mechanical behavior of single-layered wire strand.
文摘The paintings in the Yuan Dynasty, because oft.heir unique characteristics of the times, have made a deep and superexcellent track in the history of the Chinese painting, among which the literati landscape paintings represented the subject of the paintings in the Yuan Dynasty. And in the literati paintings, Ni Zan＇s paintings are the most representative. The application of the pen and ink in his works is concise and thinly scattered, and the artistic conception is cold and desolate. In this paper, with ＂Map of a fishing village in an autumn sunny day after the rain＂ as an example, the author analyzes Ni Zan＇s painting style and the causes of its formation.
文摘The numerical simulation on drawing process of automotive B-pillar was carried out on AutoForm software,and dangerous forming areas were discovered.The processing parameters,such as the layout of drawbeads,blank holding force and the shape of blank,were adjusted and optimized according to the simulation results.Results indicate that the quality defects can be forecast and removed,which improves the stability of forming process.The cost of design is decreased and the research cycle is shortened.It is proved that the drawing process and die design of B-pillar forming are feasible in actual production.
文摘This paper describes the experimental analysis of eye-movement during the generation of a trajectory by the human upper limb, carried out to elucidate the human mechanism for visual-information recognition. The results showed that the subjects adopted an eye-movement pattern called the subgoal travel method （fixating in the vicinity of the fingertip while drawing/tracing） for the complete circle. Subsequently, when the target trajectory was one of incomplete shapes, some subjects continued following the subgoal travel method by drawing the missing part of the target trajectory, while others followed two other eye-movement patterns. The first is called the center-point fixation method, in which subjects consider the center point as the most important point for generating the target-image trajectory, and therefore, fix their gaze at the center point throughout the experiment. The second is called the point-to-point travel method, in which the subjects＇ gazes shift between the center point of a displayed image and their fingertip. Further, the results confirmed that the eye-movement pattern, movement accuracy, and drawing speed are correlated. Additional experiments clarified the conditions for which different eye-movement patterns are suitable： the subgoal travel method is suitable for high-accuracy drawing; the center-point fixation method is suitable for higher-sneed drawing
