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可变密度
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  variable density
     The BP Model for Variable Density Stand Volume
     可变密度蓄积量的BP网络模型
短句来源
     The mean precision of the prediction model reached 97. 8% through the test of50 sample plots and it could be used to work out the variable density yield table.
     此预测模型经50块样地检验,平均精度达97.8%,可以用于编制可变密度收获表。
短句来源
     STUDY ON NATURAL DAHURIAN LARCH STAND GROWTH MODEL AND VARIABLE DENSITY YIELD TABLE
     兴安落叶松天然林林分生长模型和可变密度收获表的研究
短句来源
     The Establishment of Variable Density Yield Table for the Chinese Fir Plantation in Kaihua
     浙江开化杉木人工林可变密度收获表的编制
短句来源
     On the Establishment of Variable Density Yield Table for the Pinus massoniana Plantation in Fujian
     福建马尾松人工林可变密度收获表的编制
短句来源
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  variable-density
     Study on Drawing up Variable-density Yield Tables with the Control Chart of Stand Density
     用林分密度控制图编制可变密度收获表的研究
短句来源
     On Drawing up the Variable-density Yield Table for Chinese Fir Plantation
     杉木人工林可变密度收获表的编制
短句来源
     Studies on the Variable-Density Whole Stand Model of Cunninghamia lanceolata Plantations and Its Application
     杉木人工林可变密度的全林分模型及其应用研究
短句来源
     Based on foregoing information, density index of stand was led into drowing control chart of stand density into variable-density yield table so that the outputting results between chart and table were correspondant, this provided a method for drawing up variable-density yield tables, simplex method.
     引入林分密度指数,将林分密度控制图导成可变密度收获表,保证了图表之间输出结果的一致性,为可变密度收获表的编制提供了一种方法。
短句来源
  “可变密度”译为未确定词的双语例句
     Studies on the Dynamic Prediction Methods of Forest Resources Ⅱ.The yield pre-evaluation
     森林资源动态预测方法的研究Ⅱ.编制可变密度收获表的收获预估模型
短句来源
     Development of Variable─Density Glass Mica Composite Material
     可变密度玻璃云母复合材料的研制
短句来源
     By combination of site index,density-controlling diagram of artificial stand of Pinus sylvestris was compiled with densith index and was changed into variˉavle-densith yield table,which could forecast and control the harvest for merchantable forest.
     在多形地位指数模型基础上 ,引进林分密度指数 ,把编制的落叶松人工林林分密度控制图推导成可变密度收获表 ,对商品林的收获进行预测和控制 ,建立了商品林立地、密度与收获一体化的经营管理技术体系。
短句来源
     Taking volume as the function of shelterbelt age ,site index and density , based on the data of plots of shelterbelt in study area , the curve estimation of the varied-density and whole-stand volume model was established , It helps to predict the volume of study area.
     同时将蓄积量作为林龄(t)和地位指数(SI)和密度(N)的函数,利用研究区农田防护林样地,拟合了研究区防护林带的可变密度的全林分蓄积生长模型,为研究区蓄积量的预估打下基础。
短句来源
     The approach ensures that the SDCC and the common stand tables derived from ISGM such as the normal yield table, V-G table, growth table of unthinned stand in relation to spacing are compatible.
     指出由全林整体生长模型推导出的林分密度控制图与由它推导出的多种常用林分表如标准表、正常收获表、不同初植密度林分的自然生长过程表、可变密度收获表等之间是相容的。
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  variable density
Motion of a shock wave through a gas of variable density
      
A successive approximation method is used to solve the self-similar problem of gas flow accompanying a shock wave propagated through a polytropic gas of variable density.
      
Inviscid flow in the neighborhood of the stagnation point of a blunt body with variable density along the axis
      
Expansion characteristics of twisted jets of variable density
      
A qualitative study of self-similar flows with consideration of possible initial gas motion is performed for the problem of motion of a variable density gas in shock tubes with varying cross section.
      
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  variable-density
Population inversion behind a detonation wave propagating in a variable-density medium
      
Self-similar axisymmetric thermal in a variable-density medium
      
We present a variable-density formation separation technique to address this problem.
      
Study on the method of constructing variable-density yield table
      
Variable-density yield tables of old-growth Larch are constructed based on growth equation of stand average DBH and relationship between stand average DBH and the other stand attributes.
      
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The calibration of the constant temperature normal and inclined hotwire anemometer in transonic flows is described in this paper. The purpose of the calibration is to measure wire sensitivities to mass flow rate, density and direction. The experiments were performed in the nozzle of a variable density blow-down supersonic wind tunnel at Mach numbers ranging from 0.5 to 1.36, wire Reynolds numbers of 100 to 320 and at overheat ratios of about 1.0. It was found that within these test conditions , the mass flow...

The calibration of the constant temperature normal and inclined hotwire anemometer in transonic flows is described in this paper. The purpose of the calibration is to measure wire sensitivities to mass flow rate, density and direction. The experiments were performed in the nozzle of a variable density blow-down supersonic wind tunnel at Mach numbers ranging from 0.5 to 1.36, wire Reynolds numbers of 100 to 320 and at overheat ratios of about 1.0. It was found that within these test conditions , the mass flow rate and density sensitivies are almost equal and essentially independent of Mach number and Reynolds number, also the direction sensitivity is independent of Reynolds number. At the same time, we used Behrens' empirical relation to estimate the density and velocity sensitivities, after comparing with experimental results, we found the trends of both are consistent.

本文论述的是跨音速流中常温垂直和倾斜热线风速仪的校测。校测的对象是热线对质量流速率、密度和方向的敏感系数。校测的实验是在一个可变密度的暂冲式超音速风洞的喷管段中进行的,马赫数范围为0.5—1.36,雷诺数范围为100—320,过热比为1.0左右。实验表明,在这样的条件下,质量流速率和密度敏感系数几乎相等,基本上跟马赫数和雷诺数无关;方向敏感系数也跟雷诺数无关。同时,用Behrens的经验关系式估计了密度敏感系数和速度敏感系数,与实验数据作比较,结果二者的趋势是一致的。

The variable density yield table is established for Chinese fir plantation in Dagangshan Experiment Bureau, which is based on generalized Richards growth model, in which site index and density index are included. Errors in the model are analyzed. The results show that the table is suitable for Chinese fir plantation in this Bureau and the method proposed in the paper is satisfying.

本文利用推广的 Richards 生长模型编制了大岗山实验局杉木人工林的可变密度收获表,在这模型中包括地位指数及密度指数。误差分析表明此表适用于该地区的杉木人工林,这种编表方法是一种较好的方法。

The variable density yield table of young and middle age stands of dahurian larch (Larix gmelinii Rupr) in Daxing′anling district were compiled base on the growth theory of Von Bertalanffy. We have developed time-site-density continuous equations and studied the growth and yield of DBH, height, basal area and volume of different origins, sites and densities of dahurian larch. The result reflected the present growth situation of dahurian larch and provided the theoretical basis for constructing forestry tables...

The variable density yield table of young and middle age stands of dahurian larch (Larix gmelinii Rupr) in Daxing′anling district were compiled base on the growth theory of Von Bertalanffy. We have developed time-site-density continuous equations and studied the growth and yield of DBH, height, basal area and volume of different origins, sites and densities of dahurian larch. The result reflected the present growth situation of dahurian larch and provided the theoretical basis for constructing forestry tables and taking corresponding management treatments.

本文通过内蒙古大兴安岭林区兴安落叶松幼、中龄林可变密度收获表编制过程,根据生长理论,建立时间-立地-密度连续型方程,对该树种不同起源、不同立地、不同密度的林木的直径、树高、断面积和蓄积量的生长规律进行了研究,所得结果即反映内蒙古大兴安岭林区兴安落叶松幼、中龄林的现状,又为编制林业数表和采取相应经营措施提供理论根据。

 
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