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基于椭球函数的棉花叶倾角分布动态模拟（Dynamic Simulation of Leaf Inclination Angle Distribution Based on Ellipsoidal Function）
棉花 叶倾角分布 椭球函数 动态模拟
2009/5/22
根据试验资料，在系统分析棉花冠层叶倾角时空分布规律的基础上，将整个生育期分为4个生长阶段，并利用高斯五点距离法将冠层分为5层，用椭球分布函数模拟不同生育阶段、不同高度层上的叶倾角分布密度。模型能较全面地反映整个生育期冠层不同高度上的叶倾角分布情况，且方便用于分层的光合作用模型。利用不同播期的试验资料对模型进行验证，叶倾角频率分布的模拟结果与1∶1直线之间的决定系数R2和均方根误差（RMSE）分别为...
Model study of the effect of barley grain moisture content on the distribution of horizontal and vertical pressures in a silo
barley moisture content silo pressure
2008/11/26
This study presents the results of the measurements of horizontal and vertical pressures in a silo, performed for dry barley grain with a moisture content of 13% d.b. and compares those results with t...
Model study of the effect of barley grain moisture content on the distribution of horizontal and vertical pressures in a silo
barley moisture content silo pressure
2008/11/26
This study presents the results of the measurements of horizontal and vertical pressures in a silo, performed for dry barley grain with a moisture content of 13% d.b. and compares those results with t...
Distribution of carbohydrate pools within water-stable aggregates of an Ultisol in Southern Nigeria
carbohydrate concentrations water-stable aggregates Nigerian Ultiso
2008/11/26
R-CHOc, irrespective of the type of amendment. The distribution of the carbohydrate fractions within the water-stable aggregates generally decreased with increasing time of sampling. At the 3rd and 6...
Changes in pore size distribution and aggregate stability of two soils under long term tillage systems
tillage systems bulk density pore size distribution aggregate stability
2008/11/26
Tillage-induced changes in pore-size distribution and aggregate stability of two soils were investigated for 7 con- secutive years from 1994 to 2000. The three tillage treatments were used: convention...
Effects of moisture content of grain layers and their arrangement in the silo on the temperature and pressure distribution
cereals silo temperature pressure distribution
2008/11/26
In the present paper, results of temperature and pressure measurement of some cereals (triticale, rye, oat) along with the vertical silo wall were presented. Laminar filling of the silo with layers o...
Effect of moisture content of cereal grains layer on pressure distribution on silo wall
silo grain pressure distribution loisture content
2008/11/21
The paper presents the results of measurements of silo wall pressure during the storage of yheat, barley and oats grain. The study was conducted on a ;st station. The test silo was filled with two lay...
Effect of triticale moisture content and slenderness ratioof a silo on pressure distribution
triticale moisture content slenderness of a silo pressure bridging
2008/11/19
Results of stand studies on the vertical and horizontal pressure of triticale grains with different moisture content (u1 = 0.212 and u2 = 0.245 kg kg-1 d.b.) in silos of H/D1 = 15 and H/D2 = 8 slender...
Influence of rootstocks on size distribution and fruit quality of sweet cherry cultivars
fruit quality sweet cherries rootstock
2008/11/14
In the cherry rootstock trials at Ullensvang, Norway the following quality prameters of sweet cherry cultivars: Van, Ulster and Burlat on seedling, Colt and Gisela 5 were evaluated: mean fruit weight,...
Pore size distribution and amount of water available for plants in arable soils of Poland
porosity water available for plants soils of Poland
2008/11/14
The results of investigations on porosity and the amount of water available for plants in Polish soils are presented. The porosity and distribution of soil pores are strongly connected with the differ...
Root distribution of apple tree under various irrigation systemswithin the hilly region of Romania
root distribution apple tree irrigation
2008/11/13
The present paper shows the effects of various irrigation methods on the distribution of roots in the Golden Delicious apple cultivar grafted on MM 106 rootstock under the specific conditions of the h...
Quantum mechanical approach to sphere beds in the container-packing fractions and radial distribution function
granular material quantum mechanical approach
2008/11/12
This paper is a continuation of the work on the new approach to the packing problems of randomly embedded granular material proposed by Góźdź and Pietrow. In previous paper a quantum mechani...
The use of the mercury porosimeter for the evaluation of micropore size distribution in potato extrudates
potato extrudates internal porosity mercury porosimeter
2008/11/11
Several samples of potato flour ex-trudates were obtained by simple and screw extruder. The effects of process variables (moisture, temperature) were related to the following extrudates features: expa...
The use of the mercury porosimeter for the evaluation of micropore size distribution in potato extrudates
potato extrudates internal porosity mercury porosimeter
2008/11/11
Several samples of potato flour ex-trudates were obtained by simple and screw extruder. The effects of process variables (moisture, temperature) were related to the following extrudates features: expa...
Two approaches to the description of distribution keys in crop simulation models
dynamic model plant development physiological age dry matter distribution keys
2008/11/11
Distribution keys are used in crop models for the description of assimilates partitioning between several plant organs. Standard approach is to use table data for discrete points as functions of a phy...