科创中国

瑞丽作为国家重点开发开放实验区,但在绿色物流发展中,还存在着思想观念落后、政策法规滞后、技术和信息化水平不高、标准化薄弱、专业人才匮乏等问题;并指出亟需树立全新的绿色物流发展理念、大力开发和采用绿色物流技术、拓新传统物流作业方式、加强物流信息系统和标准化体系建设、培养绿色物流专业人才,以推进瑞丽绿色物流又好又快发展.

Structure design and fabricating methods of three-dimensional(3D)artificial spherical compound eyes have been researched by many scholars.Micro-nano optical manufacturing is mostly used to process 3D artificial compound eyes.However,spherical optical compound eyes are less at optical performance than the eyes of insects,and it is difficult to further improve the imaging quality of compound eyes by means of micro-nano optical manufacturing.In this research,nonhomogeneous aspheric compound eyes(ACEs)are designed and fabricated.The nonhomogeneous aspheric structure is applied to calibrate the spherical aberration.Micro milling with advantages in processing three-dimensional micro structures is adopted to manufacture ACEs.In order to obtain ACEs with high imaging quality,the tool paths are optimized by analyzing the influence factors consisting of interpolation allowable error,scallop height and tool path pattern.In the experiments,two kinds of ACEs are manufactured by micro-milling with different too path patterns and cutting parameter on the miniature precision five-axis milling machine tool.The experimental results indicate that the ACEs of high surface quality can be achieved by circularly milling small micro-lens individually with changeable cutting depth.A prototype of the aspheric compound eye(ACE)with surface roughness(Ra)below 0.12?m is obtained with good imaging performance.This research ameliorates the imaging quality of 3D artificial compound eyes,and the proposed method of micro-milling can improve surface processing quality of compound eyes.

关于我国农民工的福利与社会政策问题,已有的研究多专注于实际状况与问题,从一定的理论视角出发进行的研究并不多.综合考量以往研究成果以及我国农民工面临的问题后建立的农民工社会政策决定分析框架,有助于对我国进入新世纪以来国家关于农民工社会政策的转变进行分析.近年来,我国各级政府在农民工政策选择转向中发挥了较大作用,但中央政府责任承担过少,对于地方政府的激励、约束措施不足,导致政策实施效果差强人意.因此,今后农民工社会政策的实践效果与社会权利的平等获得,在很大程度上取决于中央政府的责任承担,包括在中央层面的组织机构、制度创新以及资源供给上作出适当安排.