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unit problem
相关语句
  单元问题
     THE MODIFIABLE AREAL UNIT PROBLEM OF SPECIES DIVERSITY IN THE FOREST
     闽北森林群落物种多样性的可塑性面积单元问题
短句来源
     THE MODIFIABLE AREAL UNIT PROBLEM OF SPATIAL HETEROGENEITY OF VEGETATION COMMUNITIES IN THE TRANSITIONAL ZONE BETWEEN OASIS AND DESERT
     荒漠绿洲过渡带植被空间异质性的可塑性面积单元问题
短句来源
     The modifiable areal unit problem(MAUP)of species diversity in the forest
     分析闽北森林群落物种多样性的可塑性面积单元问题(MAUP),结果表明,闽北森林群落物种多样性存在尺度效应和划区效应,其影响随着取样面积增大而减小。
短句来源
  “unit problem”译为未确定词的双语例句
     FINACIAL MANAGEMENT IN ARMED POLICE GRASS-ROOTS UNIT:PROBLEM AND COUNTERMEASURE
     武警基建财务管理存在的问题及对策
短句来源
     The Fuzzy Clustering Neural Network of the Dead Unit Problem
     模糊聚类神经网络的死点问题
  相似匹配句对
     problem.
     潮滩环境问题越来越多元化、复杂化。
短句来源
     On Problem
     问题论
短句来源
     THE RIEMANN PROBLEM IN THE UNIT POLYDISC OF C~n
     多圆盘上的Riemann边值问题
短句来源
     An Extremal Problem on Unit Sphere
     单位球面上的一极值问题(英文)
短句来源
     On T-unit analysis
     关于T单位测量标准
短句来源
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  unit problem
Despite their widespread use, comparably less attention has been focused on their geographic variability and practical concerns surrounding the Modifiable Area Unit Problem (MAUP) than on the individual attributes that make up the indices.
      
Students worked in teams to gather data from an electronic database of primary- and secondary-source materials, and use the data to develop solutions to the unit problem.
      
The central unit problem required students to determine the strategies that should be pursued in 1968 to continue the struggle for a more just, equal United States society.
      
Usually studies measure the change in crime levels in contiguous areas (expressed as discrete sub-divisions of a study area), but this can become problematic due to difficulties such as the Modifiable Areal Unit Problem (MAUP).
      
The modifiable areal unit problem has significant implications for ecological research that involve investigating and analyzing the spatial heterogeneity of plant community.
      
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The modifiable areal unit problem(MAUP)of species diversity in the forest

分析闽北森林群落物种多样性的可塑性面积单元问题(MAUP),结果表明,闽北森林群落物种多样性存在尺度效应和划区效应,其影响随着取样面积增大而减小。长期封禁保护的森林群落和近期受人为干扰的退化森林群落物种多样性受MAUP影响趋势相同。文中应用Jackknifing方法估计群落物种多样性的近似正态分布置信区间和划区效应。

Identical units problem is a severe but inherent disadvantage in applying Lagrangian relaxation based methods for power market integrated resource scheduling and bidding problems.Serious oscillation may be caused by discrete decision variables of identical subproblems and the dual solution may be far away from the optimal schedule.In this paper,the problem caused by identical subproblems in Lagrangian relaxation framework is thoroughly analyzed through an example with two identical subproblems.Based...

Identical units problem is a severe but inherent disadvantage in applying Lagrangian relaxation based methods for power market integrated resource scheduling and bidding problems.Serious oscillation may be caused by discrete decision variables of identical subproblems and the dual solution may be far away from the optimal schedule.In this paper,the problem caused by identical subproblems in Lagrangian relaxation framework is thoroughly analyzed through an example with two identical subproblems.Based on this analysis,the authors suggest to improve the bidding model is not the ultimate method to avoid the scheduling and bidding of identical units.

本文对在利用拉格朗日松弛法解决大型电力市场综合资源的调度与竞标时所碰到的相同机组问题进行了讨论 ,认为改进电力市场竞标模式并不是解决相同机组调度与竞标问题的根本方法 .

The modifiable areal unit problem has significant implications for ecological research that involves the use of spatial data. The objective of the present study was to discuss the scale effect and zoning effect by investigating and analyzing the spatial heterogeneity of vegetation communities in the transitional zone between oasis and deserts. Geostatistical techniques were used to evaluate the spatial characteristics of plant communities. The spatial structures of different plant populations were characterized...

The modifiable areal unit problem has significant implications for ecological research that involves the use of spatial data. The objective of the present study was to discuss the scale effect and zoning effect by investigating and analyzing the spatial heterogeneity of vegetation communities in the transitional zone between oasis and deserts. Geostatistical techniques were used to evaluate the spatial characteristics of plant communities. The spatial structures of different plant populations were characterized using exponential model variogram parameters, including nugget (C 0), range (A 0) and sill (C 0+C). Two methods were employed to determine the scale effect of spatial heterogeneity: 1) a constant plot area (10 m×10 m) and the sampling area expanded to analyze spatial heterogeneity of plant populations; 2) the plot area was changed for maintaining a constant sampling area to analyze spatial heterogeneity. In addition, the plots at the scale of 500 m×500 m were clustered into nested units of different shapes and directions (10 m×200 m, 20 m×100 m, 40 m×50 m, 50 m×40 m, 100 m×20 m and 200 m×10 m) and analyzed at a resolution of 10 m×10 m to examine the zoning effect. The results showed that the spatial heterogeneity of plant populations in the transitional zone between oasis and desert were influenced significantly by scale and zoning approach. Using sensitivity analysis, we were able to obtain a suitable sampling area and zoning approach to weaken the scale and zoning effects. The scale at which different parameters were sensitive was variable. For example, C 0 and C 0+C were relatively sensitive at small scales, A 0 was affected significantly by changes at larger scales, and C 0 and A 0 were relatively sensitive to different zoning approaches. In order to gain more representative vegetation information of spatial heterogeneity, the sampling area should be more than 200 m×200 m for Nitraria sphaerocarpa populations, 100 m×100 m for Reaumuria soongorica populations, and a plot area of 20 m×20 m to 30 m×30 m should be feasible.

以荒漠绿洲过渡带植被为研究对象 ,采用地统计理论与方法 ,以优势植物泡泡刺 (Nitrariasphaerocarpa)和红砂 (Reaumuriasoongorica)种群为例 ,采用一个样地内 2 5 0 0个 10m× 10m小样方中获取的植物盖度数据来研究采样尺度和划区方式对荒漠植被空间异质性的影响。其中尺度效应研究的思路是 :一是保持粒度 (样方 )不变 ,增加幅度 (样地 )分析其对空间异质性的影响 ;二是保持幅度不变 ,改变粒度进行分析。划区效应是在样地尺度 (5 0 0m×5 0 0m)上 ,把整块样地数据聚合成 10m× 2 0 0m、2 0m× 10 0m、4 0m× 5 0m、5 0m× 4 0m、10 0m× 2 0m和 2 0 0m× 10m等不同形状和不同方向的网格进行地统计分析。结果表明 :荒漠绿洲过渡带植被空间异质性受采样尺度和划区方式影响显著。当样地面积小于 2 0 0m× 2 0 0m时 ,所获取的数据不能真实反映泡泡刺种群的空间异质性 ;当样地面积小于 10 0m× 10 0m时 ,所获取的数据不能真实反映红砂种群的空间异质性。调查泡泡刺和红砂种群的空间格局时 ,样方面积...

以荒漠绿洲过渡带植被为研究对象 ,采用地统计理论与方法 ,以优势植物泡泡刺 (Nitrariasphaerocarpa)和红砂 (Reaumuriasoongorica)种群为例 ,采用一个样地内 2 5 0 0个 10m× 10m小样方中获取的植物盖度数据来研究采样尺度和划区方式对荒漠植被空间异质性的影响。其中尺度效应研究的思路是 :一是保持粒度 (样方 )不变 ,增加幅度 (样地 )分析其对空间异质性的影响 ;二是保持幅度不变 ,改变粒度进行分析。划区效应是在样地尺度 (5 0 0m×5 0 0m)上 ,把整块样地数据聚合成 10m× 2 0 0m、2 0m× 10 0m、4 0m× 5 0m、5 0m× 4 0m、10 0m× 2 0m和 2 0 0m× 10m等不同形状和不同方向的网格进行地统计分析。结果表明 :荒漠绿洲过渡带植被空间异质性受采样尺度和划区方式影响显著。当样地面积小于 2 0 0m× 2 0 0m时 ,所获取的数据不能真实反映泡泡刺种群的空间异质性 ;当样地面积小于 10 0m× 10 0m时 ,所获取的数据不能真实反映红砂种群的空间异质性。调查泡泡刺和红砂种群的空间格局时 ,样方面积在 2 0m× 2 0m到 30m× 30m较为合适。植被空间异质性参数对划区方式的敏感性较强 ,其中泡泡刺种群的敏感性高于红砂种群。

 
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