搜索结果: 1-15 共查到“农学总论 simulation”相关记录18条 . 查询时间(0.134 秒)
Monte Carlo simulation and remote sensing applied to agricultural survey sampling strategy in Taita Hills, Kenya
Agricultural survey Taita Hills Monte Carlo simulation remote sensing
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2011/1/11
Remote sensing and Geographical Information Systems (GIS) are important tools used for assisting agricultural surveys. Such tools can be used to stratify the population samples in a study area, optimi...
Evaluation of CERES-maize simulation model results with measured data using water pillow irrigation under semi-arid climatic conditions
CERES-maize model water pillow maize water deficit
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2011/1/10
The computer-based CERES-maize model for simulating maize growth and development was used to simulate maize yield in a semi-arid region of Harran Plain of Southeastern Turkey in 2005 and 2006.
Effect of transformer on stochastic estimation of voltage sag due to faults in the power system: a PSCAD/EMTDC simulation
Faults voltage sag type of transformer PSCAD/EMTDC uniform fault distribution number of sags
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2010/3/17
Voltage sags in the electric power system are mostly due to faults in the power system. Voltage sag is characterized by its magnitude (the retained voltage), phase-angle jump, unbalance in the sag in ...
不同种植密度番茄生长行为的结构功能模型模拟（Simulation of Tomato Growth Behavior in Response to Planting-density Based on Functional-structural Model）
温室 番茄 种植密度 GreenLab模型
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2009/11/3
为研究不同密度下温室番茄的生长行为，对结构功能模型GreenLab进行改进，在提高拟合度的基础上，获得不同密度下番茄生长参数，通过参数分析将环境与番茄植株生长行为相联系。结果表明密度影响同化物产生与分配，通过外在形态，如出叶速率、叶厚、坐果率等表现，GreenLab模型可以重建这种生长行为变化。
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
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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...
Attempt to use the SWATREZ and UNDYS models for the simulation of ground water pollution in agrosystems irrigated by municipal sewage
modelling waste water ground water nitrogen hydromorphic soil
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2008/12/2
For the simulation of water movement and pollutant transport in the hydromorphic soil profile two numerical models SWATREZ and UNDYS were used. These models are based on water movement in porous mater...
Analysis of the shear behaviour of a grain assemblyusing dem simulation
grain assembly shear behaviour numerical simulation Discrete Element Method
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2008/11/26
Shear behaviour of a grain assembly in a shear box under the condition of no externally applied load was investigated numerically using the Discrete Element Method. The assembly was a monodisperse sys...
Mathematical simulation of soil cloddiness
soil mechanics clods cracking size distribution mathematical simulation
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2008/11/14
A theoretical model was developed to predict soil clod size distribution attained after tillage so that it can be taken as initial state of soil for following erosion processes. The model was develope...
Simulation of the soil water regime for grassland irrigation
water flow in soil evapotranspi ration crop production irrigation predicted
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2008/11/12
The principle aim of this study was to develop a model to predict the water processes under growing grass. This paper includes: the GRAGRO model simulates the vertical flow in an unsaturated homogeneo...
Two approaches to the description of distribution keys in crop simulation models
dynamic model plant development physiological age dry matter distribution keys
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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...
RESOURCE OPTIMIZATION BY SIMULATION TECHNIQUE IN FOOD LOGISTICS
Food logistics discrete event models simulation technique queuing air pollution
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2010/3/24
Any activity that receives inputs and convert them to outputs can be considered as a process.
Essentially the same model equations are used in the theory of chemical, biochemical, nuclear,
mechanica...
THE EFFECT OF CLIMATE CHANGE ON THE POPULATION OF SYCAMORE LACE BUG (CORYTHUCA CILIATA, SAY,TINGIDAE HETEROPTERA) BASED ON A SIMULATION MODEL WITH PHENOLOGICAL RESPONSE
climate change insects pest management simulation agriculture
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2010/3/24
Climate change affects on insect populations in many ways: it can cause a shift in geographical spread, abundance, or diversity, it can change the location, the timing and the magnitude of outbreaks o...
APPLICABILITY OF THE AFRCWHEAT2 WHEAT GROWTH SIMULATION MODEL IN HUNGARY
winter wheat modelling calibration elevated CO2 concentration
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2010/3/24
The aim of the present work was to determine the applicability of the AFRCWHEAT2 wheat
growth model under Hungarian conditions. The Farquhar model, which, when properly calibrated, gives a satisfacto...
SEASONAL DYNAMIC PATTERN ANALYSIS IN SERVICE OF CLIMATE CHANGE RESEARCH A METHODICAL CASE-STUDY — MONITORING AND SIMULATION BASED ON AN AQUATIC INSECT COMMUNITY
state-planes NMDS ordination seasonality Heteroptera similarity patterns
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2010/3/23
Our aim was to approach an important and well-investigable phenomenon – connected to a relatively simple but real field situation – in such a way, that the results of field observations could be direc...
SIMULATION EXPERIMENTS TO EVALUATE THE ROBUSTNESS OF THE OPTIMAL CONSTRUCTION OF MONITORING NETWORKS
spatial statistics optimal design simulation kriging covariance function
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2010/3/23
OptiNet is a PC program for optimal network selection. The aim of this study is to test the
program by simulation experiments and to investigate the robustness of the optimal selection. One of the mo...