搜索结果: 1-15 共查到“农学总论 model”相关记录58条 . 查询时间(0.401 秒)
Development and evaluation of full-vehicle vibration model of MF 285 tractor
step function simulation transmitted vibrations Matlab software
2014/9/22
The vibration transmitted to the tractor driver not only leads to the driver health problems, but also reduces the driver working efficiency. One of the methods utilized to reduce driver vibration is ...
Identifying the dependency pattern of daily rainfall of Dhaka station in Bangladesh using Markov chain and logistic regression model
Characteristics of Rainfall in Bangladesh Stochastic Models
2013/2/28
Bangladesh is a subtropical monsoon climate characterized by wide seasonal variations in rainfall, moderately warm temperatures, and high humidity. Rainfall is the main source of irrigation water ever...
A community-based management model for the implementation sustainable development in rural areas of Iran
Community-based management sustainable rural development stakeholders affecting factors obstacles structural equation modeling
2011/2/22
Community-based management is basically the involvement of the beneficiary communities in the management of sustainable rural development facilities. Community based management will become the pivotal...
Application of a geographical information system (GIS) based hydrological model for flow prediction in Gorganrood river basin, Iran
WetSpa model distributed model geographical information system flow prediction
2011/2/22
In this paper a spatially distributed hydrologic model (WetSpa) is used to estimate daily river water discharge in Gorganrood river basin, Iran. The model combines topography, land use and soil maps, ...
A Developed GIS-based Land Evaluation Model for Agricultural Land Suitability Assessments in Arid and Semi Arid Regions
Agricultural land suitability GIS modeling ALESarid-GIS Yield prediction Nile Delta
2010/11/16
In the study an attempt is made at deciding the best agricultural land use in a study area
located in the western part of the Nile Delta in Egypt. The area covers approximately 14,194 hectares and co...
Life Cycle Assessment Integrated into Positive Mathematical Programming: A Conceptual Model for Analyzing Area-Based Farming Policy
activity analysis economic incentive global warming reduced tillage
2010/10/25
The objective of this study was to integrate process life cycle assessment (LCA) into an activitybased microeconomic model of production to quantify environmental impacts induced by economic incentive...
Agricultural specialists’ intention toward precision agriculture technologies: integrating innovation characteristics to technology acceptance model
Iran precision agriculture technologies innovation technology
2011/1/11
Environmental technology is a major determinant for paradigm shift in agriculture and environmental improvement. Precision agriculture technologies are designed to provide extensive information and da...
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
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.
Robust multimedia watermarking: Hidden Markov model approach for video sequences
Watermarking Hidden Markov Model Wavelet domain Group of pictures
2010/3/17
Because of the large amount of frames, similarity between frames and temporal attacks (frame dropping, frame averaging, frame swapping etc.), the process for video watermarking is more difficult than ...
Determination of autoregressive model orders for seizure detection
EEG seizure AR model stepwise least square algorithm
2010/3/17
In the present study, a step-wise least square estimation algorithm (SLSA), implemented in a Matlab package called as ARfit, has been newly applied to clinical data for estimation of the accurate Auto...
Applying evapotranspiration reference model and rainfall contribution index for agricultural water management plan in Burkina Faso
Evapotranspiration water scarcity rainfed cropping calendar irrigation efficiency food production
2010/9/14
Agriculture in Burkina Faso is largely dominated by 75% of rainfed crop production, which is characterized by short and unevenly distribution of annual rainfall. The shortage of water for crop product...
基于Model Builder的库区生态敏感性分析
生态敏感性 Model Builder 分析 密云库区
2009/11/4
以密云库区为研究对象，利用生态环境现状调查资料和相关研究成果，通过生态服务价值、地质灾害、植被覆盖指数、坡度及土地覆被类型5个指标对密云库区生态环境敏感性进行了综合评价，识别出主要生态敏感区域。结果表明：生态服务价值变化对生态环境最为敏感，地质灾害因子次之；生态敏感性极高的区域主要为石城镇大部分地区、高岭镇西北部及北庄东南部和西南地区，不敏感区包括十里堡、巨各庄、大城子中部等地区。
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
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。
根系吸水模型参数的混合遗传算法估算方法（Inverse Method Estimating Root Water Uptake Model Parameters Using Hybrid Genetic Algorithms）
根系吸水模型 参数优化 混合遗传算法
2009/9/11
构建了遗传算法与Levenberg-Marquardt算法相结合的混合遗传算法，用于求解根系吸水模型参数。分别进行数值试验和棉花根系吸水试验对混合遗传算法求解精度进行验证。数值试验表明，采用混合遗传算法优化求解根系吸水模型参数的优化值具有较高的精度，含水率资料的时间步长和空间步长对根系吸水模型参数的优化精度有较大影响，在实际中时间步长可取值5～10d，空间步长取值5～10cm。对室内棉花根系吸水进...
Estimation of Nutrient Elution and Removal on Sediment Surface of Clayey Canal Based on Hydraulic Model Experiments
water quality denitrification creek chemical oxygen demand
2009/9/10
A clayey canal tends to be selected over a concrete-lined canal to achieve water quality conservation in a land improvement project. Therefore, it is important to analyze quantitatively the interactio...