The historic development of interior landscaping in foreign countries was systematically discussed in this paper from 5 aspects : origin of potted plants , development of greenhouse , mechanical control of interior environment , style change of architecture and enhancement of environmental awareness 从盆栽植物起源、温室发展、室内环境的机械控制、建筑风格的改变、环境意识的加强等五个方面对国外室内植物绿化的历史发展作了系统的论述。
In order to improve the water quality of shixi river in guiyang , the article studies how to use the mechanical control measures to achieve the water environment treatment of shixi river under the condition of monitoring of water quality , which provides good methods to achieve urban river water quality treatment 摘要为改善贵阳市城区河流市西河的水环境质量,在对市西河水质监测的基础上,通过工程措施,实现市西河的治理,为城市河流水环境治理提供了有力依据。
The dissertation also does a research on the control strategies of mechanical control parts . the theoretical expression among needle valve throttle area , cam - control valve throttle area and the equivalent throttle area of combining control is given , and the principle of combining control of the two valves is analyzed . the arresting control strategies under various engaging conditions are presented , namely the engaging condition of same overrunning length and same engaging speed but different weight , the engaging condition of same overrunning length and same weight but different speed as well as the engaging condition of same weight and same engaging speed but different overrunning length 研究了机械控制机构的控制策略:从理论上推导出了针阀节流面积、凸轮控制阀节流面积及联合控制的当量节流面积三者之间的关系表达式;分析了针阀与凸轮阀联合控制的控制原理和方法;给出了同拦停距离同撞网速度不同重量飞机撞网状况、同拦停距离相同重量不同撞网速度飞机撞网状况以及同重量飞机同撞网速度不同拦停距离撞网状况的拦阻控制策略。