智能软硬件生产工具已在水文与水资源工程专业的水文分析计算、规划设计、运行管理等相关工作中普及使用,本科生产实习环节综合运用所学知识开展相关核心任务计算的参与度降低,导致实际生产作业与专业课程理论教学环节的衔接程度减弱,...智能软硬件生产工具已在水文与水资源工程专业的水文分析计算、规划设计、运行管理等相关工作中普及使用,本科生产实习环节综合运用所学知识开展相关核心任务计算的参与度降低,导致实际生产作业与专业课程理论教学环节的衔接程度减弱,通过本科生产实习教学实现由理论学习到工程实践的难度增加。针对这一问题,本文提出一种以学生为中心的“关联任务驱动–群体合作学习”的生产实习实践教学模式,通过设置多个相互关联且贯穿多个环节的生产任务,并根据需要选择能支撑实习任务的生产实习基地,由本科生分组协同合作完成关联任务并由指导教师阐明不同专题间的支撑与关联关系,可有效克服专业课程理论教学环节与教学实践环节衔接程度减弱的问题,提高生产实习效果。Intelligent hardware and software production tools have been widely used in hydrological analysis and calculation, planning and design, operation management and other related work of hydrology and water resources engineering major. However, this situation reduces the students’ participation in the calculation of related critical tasks by comprehensively applying the knowledge they have learned in the undergraduate production practice. As a result, the degree of connection between actual production and theoretical teaching of professional courses is weakened, and the difficulty of realizing the transition from theoretical learning to engineering practice through undergraduate production practice teaching increases. Therefore, this paper proposes a student-centered production practice teaching mode of “related task-driven-group cooperative learning” to solve this problem. Specifically, the teachers set several production tasks that are interrelated and run through multiple links and select a production practice base that can support the practice tasks. The students complete the associated tasks by group cooperative work. Finally, the support and correlation between different topics are elucidated by the teachers. In this way, the weak degree of connection between actual production and theoretical teaching of professional courses can be relieved and the effect of production practice can be improved.展开更多
The contribution rate of ecosystem service value variation was used to analyze the effects of land use changes on the changes of ecosystem service value in Xingguo County during 1996-2005.Grey integrated correlation w...The contribution rate of ecosystem service value variation was used to analyze the effects of land use changes on the changes of ecosystem service value in Xingguo County during 1996-2005.Grey integrated correlation was employed to explore the contribution level of the indicators such as total population,urbanization level,proportion of primary industry and investment of social fixed assets on ecosystem service value,and the correlation analysis was also carried out.The results showed that the ecosystem service value in Xingguo County during 1996-2005 mainly was woodland,and the decrease of woodland area was the major reason for the sustained reduction of ecosystem service value.With the further increase of market demand and the incentives of local government,the garden area rapidly increased during 2001-2005,and the influence degree of garden towards the changes of ecosystem service value was only second to woodland,ranking No.2.Four socio-economic indicators had different correlation degree with ecosystem service value during the different research periods.Total population,urbanization level and proportion of primary industry had high correlation degree with ecosystem service value,whereas the influence degree of various socio-economic indicators on ecosystem service value was equal with each other day by day.Urbanization level,investment of social fixed assets and total population had significant negative correlation with ecosystem service value,while the proportion of primary industry had positive correlation with ecosystem service value.展开更多
Henan Province is an important grain production base, whose stable production is related to the economic development and social stability significantly. To summarize the primary factors of grain producing, we used gre...Henan Province is an important grain production base, whose stable production is related to the economic development and social stability significantly. To summarize the primary factors of grain producing, we used grey correlation analysis method to analyze 10 correlative factors such as grain yield, grain yield per unit area, effective irrigated area, rural employed persons, grain planting area, consumption of chemical fertilizer in 25 years. The results showed order of synthetic degree of incidence: effective irrigated area>rural electricity consumption>consumption of chemical fertilizer>disaster crop area>grain yield per unit of area>total power of agricultural machinery>afflicted crop area>grain planting area>number of the rural employed persons. Finally, according to synthetic degree of incidence between influential factors and total grain output respectively, a series of measures and the suggestions was proposed for grain production in Henan Province, which will also provide the scientific basis and help for the government correct decision-making.展开更多
In order to test the anti-interference ability of an Unmanned Aerial Vehicle(UAV) data link in a complex electromagnetic environment,a method for simulating the dynamic electromagnetic interference of an indoor wirele...In order to test the anti-interference ability of an Unmanned Aerial Vehicle(UAV) data link in a complex electromagnetic environment,a method for simulating the dynamic electromagnetic interference of an indoor wireless environment is proposed.This method can estimate the relational degree between the actual face of an UAV data link in an interface environment and the simulation scenarios in an anechoic chamber by using the Grey Relational Analysis(GRA) theory.The dynamic drive of the microwave instrument produces a real-time corresponding interference signal and realises scene mapping.The experimental results show that the maximal correlation between the interference signal in the real scene and the angular domain of the radiation antenna in the anechoic chamber is 0.959 3.Further,the relational degree of the Signal-toInterference Ratio(SIR) of the UAV at its reception terminal indoors and in the anechoic chamber is 0.996 8,and the time of instrument drive is only approximately 10 μs.All of the above illustrates that this method can achieve a simulation close to a real field dynamic electromagnetic interference signal of an indoor UAV data link.展开更多
The simplified incidence function model which is driven by the colored correlated noises is employed to investigate the extinction time of a metapopulation perturbed by environments. The approximate Fokker-Planck Equa...The simplified incidence function model which is driven by the colored correlated noises is employed to investigate the extinction time of a metapopulation perturbed by environments. The approximate Fokker-Planck Equation and the mean first passage time which denotes the extinction time （Tex） are obtained by virtue of the Novikov theorem and the Fox approach. After introducing a noise intensity ratio and a dimensionless parameter R = D /α （D and a are the multiplicative and additive colored noise intensities respectively）, and then performing numerical computations, the results indicate that： （i） The absolute value of correlation strength A and its correlation time τ3 play opposite roles on the Tex; （ii） For the case of 0 〈λ〈 1,α and its correlation time τ2 play opposite roles on the Tex in which R〉 1 is the best condition, and there is one-peak structure on the Tex - D plot; （iii） For the case of-1 〈 λ≤ 0, D and its correlation time τ1 play opposite roles on the Tex in which R 〈 1 is the best condition and there is one-peak structure on the Tex - τ2 plot.展开更多
As the conventional reciprocating gait orthosis(RGO)has been deemed incapable of facilitating the patients’passive movement with significant gait discrepancies and distortion,in addition to characteristics such as po...As the conventional reciprocating gait orthosis(RGO)has been deemed incapable of facilitating the patients’passive movement with significant gait discrepancies and distortion,in addition to characteristics such as poor stability,and negligible knee joint rehabilitation,a power assisted reciprocating gait orthosis(PARGO)was designed.Drive devices were added to the hip and knee joints of the RGO.Through efficient implementation of structural components,the number of the required motors was reduced,therefore decreasing the weight of the orthosis.The PARGO knee joint’s structural principle was analyzed to characterize the effect of the PARGO’s single-axis knee joint design on wear comfort,thereby providing a basis for the wear of the PARGO.By analyzing the sagittal movement patterns of the hip and knee joints during normal human gait,kinematic analysis was carried out to obtain the input patterns of the PARGO hip and knee joint drive motors,enabling the patients to more accurately reproduce the normal gaits of hip and knee joints during the rehabilitation training with the aid of the PARGO,and the control process of the PARGO was studied.Finally,a prototype of the PARGO was developed,and experimentation was carried out to demonstrate the feasibility of the improved orthosis.展开更多
文摘智能软硬件生产工具已在水文与水资源工程专业的水文分析计算、规划设计、运行管理等相关工作中普及使用,本科生产实习环节综合运用所学知识开展相关核心任务计算的参与度降低,导致实际生产作业与专业课程理论教学环节的衔接程度减弱,通过本科生产实习教学实现由理论学习到工程实践的难度增加。针对这一问题,本文提出一种以学生为中心的“关联任务驱动–群体合作学习”的生产实习实践教学模式,通过设置多个相互关联且贯穿多个环节的生产任务,并根据需要选择能支撑实习任务的生产实习基地,由本科生分组协同合作完成关联任务并由指导教师阐明不同专题间的支撑与关联关系,可有效克服专业课程理论教学环节与教学实践环节衔接程度减弱的问题,提高生产实习效果。Intelligent hardware and software production tools have been widely used in hydrological analysis and calculation, planning and design, operation management and other related work of hydrology and water resources engineering major. However, this situation reduces the students’ participation in the calculation of related critical tasks by comprehensively applying the knowledge they have learned in the undergraduate production practice. As a result, the degree of connection between actual production and theoretical teaching of professional courses is weakened, and the difficulty of realizing the transition from theoretical learning to engineering practice through undergraduate production practice teaching increases. Therefore, this paper proposes a student-centered production practice teaching mode of “related task-driven-group cooperative learning” to solve this problem. Specifically, the teachers set several production tasks that are interrelated and run through multiple links and select a production practice base that can support the practice tasks. The students complete the associated tasks by group cooperative work. Finally, the support and correlation between different topics are elucidated by the teachers. In this way, the weak degree of connection between actual production and theoretical teaching of professional courses can be relieved and the effect of production practice can be improved.
基金Supported by Natural Science Foundation of Jiangxi Province"Research on Optimization Model of Land Use in Southern Hilly Region with Red Soil in Jiangxi Province based on Ecological Security Evaluation"(2008GQH0057)Educational Commission of Jiangxi Province"Research on Scenario Simulation of Land Use Security Pattern in Southern Hilly Region with Red Soil in Jiangxi Province" (GJJ09557)Innovative Experimental Projects of National University Students"Research on Land Use Ecological Security Assessment in Hilly Region with Red Soil based on GIS-Xingguo County in Jiangxi Province as an Example"(101042124)~~
文摘The contribution rate of ecosystem service value variation was used to analyze the effects of land use changes on the changes of ecosystem service value in Xingguo County during 1996-2005.Grey integrated correlation was employed to explore the contribution level of the indicators such as total population,urbanization level,proportion of primary industry and investment of social fixed assets on ecosystem service value,and the correlation analysis was also carried out.The results showed that the ecosystem service value in Xingguo County during 1996-2005 mainly was woodland,and the decrease of woodland area was the major reason for the sustained reduction of ecosystem service value.With the further increase of market demand and the incentives of local government,the garden area rapidly increased during 2001-2005,and the influence degree of garden towards the changes of ecosystem service value was only second to woodland,ranking No.2.Four socio-economic indicators had different correlation degree with ecosystem service value during the different research periods.Total population,urbanization level and proportion of primary industry had high correlation degree with ecosystem service value,whereas the influence degree of various socio-economic indicators on ecosystem service value was equal with each other day by day.Urbanization level,investment of social fixed assets and total population had significant negative correlation with ecosystem service value,while the proportion of primary industry had positive correlation with ecosystem service value.
基金Supported by the Decision Research Bidding Office of Henan Provincial Government (Grant No. B104)Henan Provincial Department of Science and Technology Research Project (Grant No.0613011200)Henan Provincial Social Science Planning Project(2007BJJ)~~
文摘Henan Province is an important grain production base, whose stable production is related to the economic development and social stability significantly. To summarize the primary factors of grain producing, we used grey correlation analysis method to analyze 10 correlative factors such as grain yield, grain yield per unit area, effective irrigated area, rural employed persons, grain planting area, consumption of chemical fertilizer in 25 years. The results showed order of synthetic degree of incidence: effective irrigated area>rural electricity consumption>consumption of chemical fertilizer>disaster crop area>grain yield per unit of area>total power of agricultural machinery>afflicted crop area>grain planting area>number of the rural employed persons. Finally, according to synthetic degree of incidence between influential factors and total grain output respectively, a series of measures and the suggestions was proposed for grain production in Henan Province, which will also provide the scientific basis and help for the government correct decision-making.
基金supported by a certain Ministry Foundation under Grant No.20212HK03010
文摘In order to test the anti-interference ability of an Unmanned Aerial Vehicle(UAV) data link in a complex electromagnetic environment,a method for simulating the dynamic electromagnetic interference of an indoor wireless environment is proposed.This method can estimate the relational degree between the actual face of an UAV data link in an interface environment and the simulation scenarios in an anechoic chamber by using the Grey Relational Analysis(GRA) theory.The dynamic drive of the microwave instrument produces a real-time corresponding interference signal and realises scene mapping.The experimental results show that the maximal correlation between the interference signal in the real scene and the angular domain of the radiation antenna in the anechoic chamber is 0.959 3.Further,the relational degree of the Signal-toInterference Ratio(SIR) of the UAV at its reception terminal indoors and in the anechoic chamber is 0.996 8,and the time of instrument drive is only approximately 10 μs.All of the above illustrates that this method can achieve a simulation close to a real field dynamic electromagnetic interference signal of an indoor UAV data link.
文摘The simplified incidence function model which is driven by the colored correlated noises is employed to investigate the extinction time of a metapopulation perturbed by environments. The approximate Fokker-Planck Equation and the mean first passage time which denotes the extinction time （Tex） are obtained by virtue of the Novikov theorem and the Fox approach. After introducing a noise intensity ratio and a dimensionless parameter R = D /α （D and a are the multiplicative and additive colored noise intensities respectively）, and then performing numerical computations, the results indicate that： （i） The absolute value of correlation strength A and its correlation time τ3 play opposite roles on the Tex; （ii） For the case of 0 〈λ〈 1,α and its correlation time τ2 play opposite roles on the Tex in which R〉 1 is the best condition, and there is one-peak structure on the Tex - D plot; （iii） For the case of-1 〈 λ≤ 0, D and its correlation time τ1 play opposite roles on the Tex in which R 〈 1 is the best condition and there is one-peak structure on the Tex - τ2 plot.
基金The Research Foundation for Key Program of Beijing(Grant No.D141100003614001)
文摘As the conventional reciprocating gait orthosis(RGO)has been deemed incapable of facilitating the patients’passive movement with significant gait discrepancies and distortion,in addition to characteristics such as poor stability,and negligible knee joint rehabilitation,a power assisted reciprocating gait orthosis(PARGO)was designed.Drive devices were added to the hip and knee joints of the RGO.Through efficient implementation of structural components,the number of the required motors was reduced,therefore decreasing the weight of the orthosis.The PARGO knee joint’s structural principle was analyzed to characterize the effect of the PARGO’s single-axis knee joint design on wear comfort,thereby providing a basis for the wear of the PARGO.By analyzing the sagittal movement patterns of the hip and knee joints during normal human gait,kinematic analysis was carried out to obtain the input patterns of the PARGO hip and knee joint drive motors,enabling the patients to more accurately reproduce the normal gaits of hip and knee joints during the rehabilitation training with the aid of the PARGO,and the control process of the PARGO was studied.Finally,a prototype of the PARGO was developed,and experimentation was carried out to demonstrate the feasibility of the improved orthosis.
