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直径结构
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  diameter structure
     Quantifying and Predicting Stand Diameter Structure with the Logistic Distribution
     Logistic分布预测林分直径结构的研究
短句来源
     Study on stand Diameter Structure Model
     林分直径结构模型的研究
短句来源
     Study on Diameter Structure Model of Chinese Fir Plantation
     杉木人工林直径结构模型的研究
短句来源
     A Study on New Model of Stand Diameter Structure
     林分直径结构新模型研究
短句来源
     Studying Diameter Structure Regularity of Phyllostachys pubescens Stand by Way of WeiBull Distribution
     应用Weibull分布研究毛竹林分直径结构规律
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  “直径结构”译为未确定词的双语例句
     Application of Weibull Distribution Function in Prediction Model of Diameter Construction
     Weibull分布函数在林分直径结构预测模型中的应用研究
短句来源
     Five probability models are applied to analysis the structure features on diameter distribution of 8 main tree populations in natural forests of C kawakamii.
     应用 5种概率分布律对格氏栲林 8个主要树木种群的直径结构进行拟合 ,比较不同类型的拟合效果 ,探索各种群直径分布结构特征 .
短句来源
     A study on the structure and dynamics of the diameter of Pinus densiflora population in Shandong Province
     山东赤松种群直径结构及其动态研究
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     To support management of forest stumpage resources, on the basis of a systematical analysis made on the motion rule in forest stumpage resources process and establishment of a corresponding universal mathematical models, a computer simulation research is made on forcast, inspectability, reappearance and control of forest stumpage resources.
     为了给森林立木蓄积资源管理提供依据,在系统分析其运动规律并建立相应通用数学模型的基础上,研究了林木直径结构转移方程在预测、监测、再现和控制森林立木蓄积资源等方面的仿真应用。
短句来源
     The Significance of Taper Equations and Stand Diameter Structures in Developing Merchantable Volume Tables
     削度方程和林分直径结构在编制材种表中的重要意义
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  相似匹配句对
     Using AFS algebra and AFS structure, any human ordinary fuzzy concept can be represented.
     结构
短句来源
     Compared the actuality of the structure of th
     *; 结构;
短句来源
     Study on stand Diameter Structure Model
     林分直径结构模型的研究
短句来源
     A Transferring Equation for Diameter Distributing Structure of Forest Trees
     林木直径分布结构变化方程
短句来源
     and the fruit diameter, T.
     果实直径、T.
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  diameter structure
The switch reliably operated under experimental conditions at a frequency of 300 Hz with very low energy losses in small-sized dynistors with a 24-mm-diameter structure (their heating was under 55°C).
      
The possibility of switching multikiloampere current pulses having a rise rate of 200 kA/μs with the use of a single device with a 12-mm-diameter structure is shown.
      
Stand structure of an uneven-aged fir-beech forest with an irregular diameter structure: modeling the development of the Belevin
      
This study focuses on the problem of irregular diameter structure in a silver fir-beech selection (plenter) forest with a "surplus" of large diameter trees and a lack of natural regeneration and small diameter trees.
      
The stand development prediction for the next 50?years is based on a simulation model, which considers the current diameter structure, increment, recruitment, and future cutting regime.
      
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Fout kinds of top roller with different hardness, surface treatment and clearance between rollerinter diameter and boss roller are selected for testing comparison. Through a series of experiments,spinning tests, attenuation curve, dynamic friction coefficient, electronic micrograph of surface str-uctute, etc. such as, the relationship between each kind of roller and yarn quality was analysed. Thispaper points out that owing to improving grasp of the nip, narrowing the free gauge and increasingcontrolling of...

Fout kinds of top roller with different hardness, surface treatment and clearance between rollerinter diameter and boss roller are selected for testing comparison. Through a series of experiments,spinning tests, attenuation curve, dynamic friction coefficient, electronic micrograph of surface str-uctute, etc. such as, the relationship between each kind of roller and yarn quality was analysed. Thispaper points out that owing to improving grasp of the nip, narrowing the free gauge and increasingcontrolling of fibre movement low CV% of yarn is obtained. In order to reduce yarn CV%, suitablehardness, diameter, clearance and structure of the top roller should be studied further.

作者选择了不同硬度、不同表面处理、不同套差的四种胶辊,进行了纺纱试验和变细曲线、动摩擦系数、表面微观结构的电镜拍摄等特性测试;并分析了不同胶辊与成纱质量的关系,指出软胶辊主要因握持状态改善及缩短了自由区距,加强了对纤维运动的控制,从而降低了成纱条干CV%值。同时为不断改善条干CV%值,认为胶辊尚可在适宜的硬度、直径、结构等方面作进一步的试验研究。

The study was conducted on the permanent sample plots of Pinus yunnanensis. According to the growth conditon of the trees, the individual trees were divided into 4 categories i. e. dying, stagnating, a diameter growth of 1 cm/year, and a diameter growth of 2 cm/year. The mean diameter deviation index and density index were used for modelling the diameter distribution. Simulation of the diameter distribution of P. yunnanensis were carried out by means of the model. The results indicate that the predicting model...

The study was conducted on the permanent sample plots of Pinus yunnanensis. According to the growth conditon of the trees, the individual trees were divided into 4 categories i. e. dying, stagnating, a diameter growth of 1 cm/year, and a diameter growth of 2 cm/year. The mean diameter deviation index and density index were used for modelling the diameter distribution. Simulation of the diameter distribution of P. yunnanensis were carried out by means of the model. The results indicate that the predicting model has a high accuracy. This study provides a new modelling technique in the fields of predicting diameter distribution.

本文根据云南松(Pinus yunnanensis Franch)固定标准地资料,把林分立木生长划分成4个生长级,将偏中指标和密度指数作为参数,建立了林分直径结构预测模型。用该模型对云南松林分直径结构进行模拟,检验表明模型具有较高的精度。

Together with the initial condition (i.c.) and the boundary conditions (b.c.) a partial differential equation (PDE) is proposed to deal with stand growth relating to the structure of age and the one of diameter.Based on a formula which is given to describe,approximately,the relations between age,diameter and growth-rate of a tree,the PDE problem with i,c.and b.c.is solved.Thus an analytical expression describing changing structure of age and the one of diameter is obtained.When a stand is even-aged and its diameter...

Together with the initial condition (i.c.) and the boundary conditions (b.c.) a partial differential equation (PDE) is proposed to deal with stand growth relating to the structure of age and the one of diameter.Based on a formula which is given to describe,approximately,the relations between age,diameter and growth-rate of a tree,the PDE problem with i,c.and b.c.is solved.Thus an analytical expression describing changing structure of age and the one of diameter is obtained.When a stand is even-aged and its diameter distribution follows the Weibull Distribution or the Normal Distribution,the changing distribution parameters are incidently formularized.As an example of the application,the changing structure of the diameter of an even-aged Jack pine stand is simulated and forecasted.

本文提出了一个研究林分树龄和直径结构动态变化规律的偏微分方程定解问题.在给出林木直径增长率与树龄和直径的关系的近似表达式的基础上,求出了该定解问题的解.从而得到了描述林分树龄和直径结构动态变化规律的解析表达式;并附带地给出了同龄林分,当其直径分布为Weibull分布或正态分布时,其参数随时间变化的函数关系式.作为应用实例,对一块小叶松林分直径结构的变化进行了动态模拟和预测.

 
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