The types of urban-rural recreational greenways were summarized,based on bicycle tourism and their planning methodology was explored.Taking the urban and rural areas of Harbin City as the research objects,the current ...The types of urban-rural recreational greenways were summarized,based on bicycle tourism and their planning methodology was explored.Taking the urban and rural areas of Harbin City as the research objects,the current situation of urban-rural recreational greenway environment and tourism resources was investigated and the evaluation system of bicycle tourism resources was established and tourism resources were evaluated according to the AHP-fuzzy comprehensive evaluation method to select suitable resources for bicycle tourism.Through the ArcGIS software,the currently available resources(rivers,wetlands,transportations and urban-layout)and suitable bicycle tourism resources were superimposed,and the spatial pattern planning and classification planning of urban-rural recreational greenway based on bicycle tourism were carried out.To the end,insights for the development of urbanrural recreational greenway in the future were provided.展开更多
Flexible transfer line(FTL)is now widely used in ma ny manufacturing domains to realize efficiently,high quantity and economic prod uction.These manufacturing domains include automobile,tractor,internal-combu stion en...Flexible transfer line(FTL)is now widely used in ma ny manufacturing domains to realize efficiently,high quantity and economic prod uction.These manufacturing domains include automobile,tractor,internal-combu stion engine,and so on.In today’s competitive business environment,it is vit ally important for machine tool manufacturers to design flexible transfer line m ore effectively and efficiently according to a wider variety of customer demand s.This paper proposes an approach to a bidding-based flexible transfer line sc hematic design system.By analyzing manual FTL design process,the architecture o f flexible transfer line schematic design system(FTLSDS)is established.The syst em consists:of four processes:part feature modeling,process planning,FTL fac i lity layout and FTL evaluation. For FTL schematic design.a five-level proces s planning strategy named hierarchical process planning method is proposed.This method includes selection of manufacturing feature machining operation;part se t-up planning,feature sequencing,operation sequencing and process plan genera ting.The major decision relies on setup planning.According to the proceeding o f the hierarchical process planning,the structure of reasoning is proposed base d on blackboard.Under this paradigm,a cooperative effort between a hybrid coll ection of knowledge sources is possible.Total reasoning task can be divided int o some subtasks,and recursive-reasoning system is formed.It is convenient for process planning with step-by-step solution.Meanwhile,the blackboard is use d as the global data exchange area during all reasoning process.By using modula r technology,special purpose machine tools can be designed more efficiently and rapidly.The framework of machine modular design system to support machine requ irement design for FTL is established.By synthesizing the FTL evaluation criter ia.five evaluation criteria of flexible transfer 1ine schematic design are take n into account.An exampie is supplied to demonstrate and verify the validity an d feasibility of flexible transfer line schematic design approach.展开更多
Based on analytic hierarchy process(AHP) theory,a vital important problem for top-layer planning and overall design of modern self-propelled gun-howitzer system,namely overall project decision-making,was analyzed.A hi...Based on analytic hierarchy process(AHP) theory,a vital important problem for top-layer planning and overall design of modern self-propelled gun-howitzer system,namely overall project decision-making,was analyzed.A hierarchy model was built to solve the complex and uncertain problem,and a decision-making index system was established.Then,the weights in all layers of the model were determined by simulating experts.Finally,according to the calculated results of the elements in each layer,the weights of the alternatives to the overall goal were calculated to conduct the hierarchy total decision.A decision example shows that the overall project of a self-propelled gun-howitzer A is much better than that of another self-propelled gun-howitzer B,digitalized in comprehensive efficiency,operability,system accuracy and economy,but inferior to it in the information capability,and there exists relatively larger gap between them in the information sharing index.展开更多
目的评价“对分课堂”与案例教学联合模式在提升专业型公共卫生硕士(Master of Public Health,MPH)研究生健康干预计划设计能力中的应用效果。方法于2022—2023学年和2023—2024学年春季学期,采用全面调查方法选取北京大学选修健康教育...目的评价“对分课堂”与案例教学联合模式在提升专业型公共卫生硕士(Master of Public Health,MPH)研究生健康干预计划设计能力中的应用效果。方法于2022—2023学年和2023—2024学年春季学期,采用全面调查方法选取北京大学选修健康教育与健康促进课程的所有MPH研究生为研究对象。采用“对分课堂”与案例教学对课程进行改革,采用历史对照单盲试验设计、描述性分析等方法比较MPH研究生健康干预计划设计能力提升效果。结果基于课程分析,本研究提出了加强对健康行为和传播理论价值的思考、健康教育干预计划实践训练以及逻辑实践训练3项改革重点。MPH研究生健康干预计划设计能力提升结果显示,试验组学生的健康干预项目计划书总分为(89.35±3.59)分,高于对照组;评价方案、背景与需求评估、干预策略、行为理论或传播理论维度得分分别为(26.95±0.64)分、(26.90±1.37)分、(26.30±1.60)分、(9.20±0.92)分,均高于对照组。结论“对分课堂”与案例教学联合模式在提升MPH学生健康干预项目设计的整体质量,尤其是评价方案设计方面具有积极作用。因此,可认为该教学模式对于提升MPH研究生健康干预计划设计能力具有一定的积极作用。展开更多
先进压缩空气储能(advanced compressed air energy storage,A-CAES)具有大容量、非补燃、寿命长、比投资小等突出优势,已成为最具潜力与发展前景的新型储能技术之一。为充分挖掘A-CAES潜能,并提升其优化规划的合理性,提出了一种考虑调...先进压缩空气储能(advanced compressed air energy storage,A-CAES)具有大容量、非补燃、寿命长、比投资小等突出优势,已成为最具潜力与发展前景的新型储能技术之一。为充分挖掘A-CAES潜能,并提升其优化规划的合理性,提出了一种考虑调峰-备用-爬坡-惯量多应用价值的大规模A-CAES多阶段优化规划策略。首先,考虑新能源与负荷增长进程,提出大规模A-CAES多阶段优化规划架构与流程;其次,研究A-CAES在削峰填谷、事故备用、灵活爬坡、惯量支撑等方面的应用价值及运行特性,最后,以多阶段经济价值与多尺度功效价值为需求导向,将上述运行特性映射为规划边界,构建大规模A-CAES多阶段优化规划模型。基于改进IEEE-118节点系统开展算例分析,结果表明:所提策略能够充分考虑大规模A-CAES多应用价值进行配置,避免因超前投资与粗略估计造成的储能资源冗余。展开更多
基金Supported by Heilongjiang Natural Science Funding Project"Ecological Evaluation of Planning and Designing of Water Landscape for Farmland in Cold Field"(E2015022)。
文摘The types of urban-rural recreational greenways were summarized,based on bicycle tourism and their planning methodology was explored.Taking the urban and rural areas of Harbin City as the research objects,the current situation of urban-rural recreational greenway environment and tourism resources was investigated and the evaluation system of bicycle tourism resources was established and tourism resources were evaluated according to the AHP-fuzzy comprehensive evaluation method to select suitable resources for bicycle tourism.Through the ArcGIS software,the currently available resources(rivers,wetlands,transportations and urban-layout)and suitable bicycle tourism resources were superimposed,and the spatial pattern planning and classification planning of urban-rural recreational greenway based on bicycle tourism were carried out.To the end,insights for the development of urbanrural recreational greenway in the future were provided.
文摘Flexible transfer line(FTL)is now widely used in ma ny manufacturing domains to realize efficiently,high quantity and economic prod uction.These manufacturing domains include automobile,tractor,internal-combu stion engine,and so on.In today’s competitive business environment,it is vit ally important for machine tool manufacturers to design flexible transfer line m ore effectively and efficiently according to a wider variety of customer demand s.This paper proposes an approach to a bidding-based flexible transfer line sc hematic design system.By analyzing manual FTL design process,the architecture o f flexible transfer line schematic design system(FTLSDS)is established.The syst em consists:of four processes:part feature modeling,process planning,FTL fac i lity layout and FTL evaluation. For FTL schematic design.a five-level proces s planning strategy named hierarchical process planning method is proposed.This method includes selection of manufacturing feature machining operation;part se t-up planning,feature sequencing,operation sequencing and process plan genera ting.The major decision relies on setup planning.According to the proceeding o f the hierarchical process planning,the structure of reasoning is proposed base d on blackboard.Under this paradigm,a cooperative effort between a hybrid coll ection of knowledge sources is possible.Total reasoning task can be divided int o some subtasks,and recursive-reasoning system is formed.It is convenient for process planning with step-by-step solution.Meanwhile,the blackboard is use d as the global data exchange area during all reasoning process.By using modula r technology,special purpose machine tools can be designed more efficiently and rapidly.The framework of machine modular design system to support machine requ irement design for FTL is established.By synthesizing the FTL evaluation criter ia.five evaluation criteria of flexible transfer 1ine schematic design are take n into account.An exampie is supplied to demonstrate and verify the validity an d feasibility of flexible transfer line schematic design approach.
文摘Based on analytic hierarchy process(AHP) theory,a vital important problem for top-layer planning and overall design of modern self-propelled gun-howitzer system,namely overall project decision-making,was analyzed.A hierarchy model was built to solve the complex and uncertain problem,and a decision-making index system was established.Then,the weights in all layers of the model were determined by simulating experts.Finally,according to the calculated results of the elements in each layer,the weights of the alternatives to the overall goal were calculated to conduct the hierarchy total decision.A decision example shows that the overall project of a self-propelled gun-howitzer A is much better than that of another self-propelled gun-howitzer B,digitalized in comprehensive efficiency,operability,system accuracy and economy,but inferior to it in the information capability,and there exists relatively larger gap between them in the information sharing index.
文摘目的评价“对分课堂”与案例教学联合模式在提升专业型公共卫生硕士(Master of Public Health,MPH)研究生健康干预计划设计能力中的应用效果。方法于2022—2023学年和2023—2024学年春季学期,采用全面调查方法选取北京大学选修健康教育与健康促进课程的所有MPH研究生为研究对象。采用“对分课堂”与案例教学对课程进行改革,采用历史对照单盲试验设计、描述性分析等方法比较MPH研究生健康干预计划设计能力提升效果。结果基于课程分析,本研究提出了加强对健康行为和传播理论价值的思考、健康教育干预计划实践训练以及逻辑实践训练3项改革重点。MPH研究生健康干预计划设计能力提升结果显示,试验组学生的健康干预项目计划书总分为(89.35±3.59)分,高于对照组;评价方案、背景与需求评估、干预策略、行为理论或传播理论维度得分分别为(26.95±0.64)分、(26.90±1.37)分、(26.30±1.60)分、(9.20±0.92)分,均高于对照组。结论“对分课堂”与案例教学联合模式在提升MPH学生健康干预项目设计的整体质量,尤其是评价方案设计方面具有积极作用。因此,可认为该教学模式对于提升MPH研究生健康干预计划设计能力具有一定的积极作用。
文摘先进压缩空气储能(advanced compressed air energy storage,A-CAES)具有大容量、非补燃、寿命长、比投资小等突出优势,已成为最具潜力与发展前景的新型储能技术之一。为充分挖掘A-CAES潜能,并提升其优化规划的合理性,提出了一种考虑调峰-备用-爬坡-惯量多应用价值的大规模A-CAES多阶段优化规划策略。首先,考虑新能源与负荷增长进程,提出大规模A-CAES多阶段优化规划架构与流程;其次,研究A-CAES在削峰填谷、事故备用、灵活爬坡、惯量支撑等方面的应用价值及运行特性,最后,以多阶段经济价值与多尺度功效价值为需求导向,将上述运行特性映射为规划边界,构建大规模A-CAES多阶段优化规划模型。基于改进IEEE-118节点系统开展算例分析,结果表明:所提策略能够充分考虑大规模A-CAES多应用价值进行配置,避免因超前投资与粗略估计造成的储能资源冗余。
