麦冬是一种生长在浙江的中草药,通常被种植在畦装的土地中。在收获麦冬时如果牵引的拖拉机不小心落入畦沟中,则三点悬挂的麦冬收获机的杆件易被拉断。为解决这一问题,本文研发出了一种自动水平控制系统,它由总控制器、电子控制单元(elec...麦冬是一种生长在浙江的中草药,通常被种植在畦装的土地中。在收获麦冬时如果牵引的拖拉机不小心落入畦沟中,则三点悬挂的麦冬收获机的杆件易被拉断。为解决这一问题,本文研发出了一种自动水平控制系统,它由总控制器、电子控制单元(electronic control unit, ECU)、双天线GPS接收机、拉绳传感器、油缸和液压阀组成,可使收获机一直处于水平姿态。总控制器先后采集到拖拉机的横滚角、油缸的位移量,估算出收获机的横滚角。采用比例微分(proportion integration differentiation, PID)控制算法产生液压阀的控制量。在麦冬田中的试验结果显示,左、右点之间的高程差是1.04 cm,标准差是2.39 cm,收获机可一直保持水平姿态,其构件没有再次断裂。展开更多
This paper is aimed at studying the environmental degradation of densely built-up areas in the process of urbanization in China. In consideration of the severe environmental conditions of the densely built-up areas, s...This paper is aimed at studying the environmental degradation of densely built-up areas in the process of urbanization in China. In consideration of the severe environmental conditions of the densely built-up areas, such as the lack of green space and open space, ecological disturbance in some areas, poor landscape quality, this paper focused on the ecological space optimization in the process of urban renewal. Firstly, theories related to this field were analyzed, and a comprehensive ecological efficiency evaluation system was established based on disciplines such as urban ecology, landscape ecology, urban sociology, behavioral psychology, biology, urban planning and design. Secondly, this system was used to judge the ecological efficiency of typical blocks on GIS platform and to find out the key spatial nodes that need to be updated. Thirdly, in different cases, space optimization projects with different theories were designed, and the spatial model of influence was used to comprehensively evaluate their ecological efficiency. Finally, the parameters under different conditions were corrected to get a systematic system for evaluating the green space system in densely built-up areas. Due to the lack of understanding of the ecological function of green space in the past, the environmental condition of densely built-up areas is not good. Therefore, the most important task of urban organic renewal is ecological restoration. In this paper, the exploration is based on the reservation for built-up areas to avoid repeated reconstruction and interference. Authors of this paper tried to find out a way to rebuild green space system that performed more complex functions with limited spatial resources. The application of "micro-transformation" of green space system in densely built-up areas turns out to improve the quality of landscape while reducing the construction cost.展开更多
基金Project supported by the Key Agricultural Project of Ningbo Science and Technology Bureau,Zhejiang(2016C10023)Key Agricultural Project in 2017 of Yinzhou Science and Technology Bureau,Zhejiang.
文摘麦冬是一种生长在浙江的中草药,通常被种植在畦装的土地中。在收获麦冬时如果牵引的拖拉机不小心落入畦沟中,则三点悬挂的麦冬收获机的杆件易被拉断。为解决这一问题,本文研发出了一种自动水平控制系统,它由总控制器、电子控制单元(electronic control unit, ECU)、双天线GPS接收机、拉绳传感器、油缸和液压阀组成,可使收获机一直处于水平姿态。总控制器先后采集到拖拉机的横滚角、油缸的位移量,估算出收获机的横滚角。采用比例微分(proportion integration differentiation, PID)控制算法产生液压阀的控制量。在麦冬田中的试验结果显示,左、右点之间的高程差是1.04 cm,标准差是2.39 cm,收获机可一直保持水平姿态,其构件没有再次断裂。
基金Sponsored by National Natural Science Fund of China(51578454)
文摘This paper is aimed at studying the environmental degradation of densely built-up areas in the process of urbanization in China. In consideration of the severe environmental conditions of the densely built-up areas, such as the lack of green space and open space, ecological disturbance in some areas, poor landscape quality, this paper focused on the ecological space optimization in the process of urban renewal. Firstly, theories related to this field were analyzed, and a comprehensive ecological efficiency evaluation system was established based on disciplines such as urban ecology, landscape ecology, urban sociology, behavioral psychology, biology, urban planning and design. Secondly, this system was used to judge the ecological efficiency of typical blocks on GIS platform and to find out the key spatial nodes that need to be updated. Thirdly, in different cases, space optimization projects with different theories were designed, and the spatial model of influence was used to comprehensively evaluate their ecological efficiency. Finally, the parameters under different conditions were corrected to get a systematic system for evaluating the green space system in densely built-up areas. Due to the lack of understanding of the ecological function of green space in the past, the environmental condition of densely built-up areas is not good. Therefore, the most important task of urban organic renewal is ecological restoration. In this paper, the exploration is based on the reservation for built-up areas to avoid repeated reconstruction and interference. Authors of this paper tried to find out a way to rebuild green space system that performed more complex functions with limited spatial resources. The application of "micro-transformation" of green space system in densely built-up areas turns out to improve the quality of landscape while reducing the construction cost.