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检索条件"任意字段=第四届国际计算机与计算技术在农业中的应用研讨会"

共 246 条记录，以下是161-170 订阅

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3-D Turbulence Numerical Simulation for the Flow Field of Suction Cylinder-Seeder with Socket-Slots

3-D Turbulence Numerical Simulation for the Flow Field of Su...

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第四届国际计算机与计算技术在农业中的应用研讨会

作者： Yanjun Zuo Xu Ma Long Qi Xinglong Liao College of Engineering South China Agricultural University Key Laboratory of Key Technology on Agricultural Machine and Equipment Ministry of EducationSouth China Agricultural University

The flow field has significantly impact on seeding performance in the suction seeding device.A three-dimensional,incompressible,viscous,RNG turbulence model and the SIMPLE method were used by computational fluid dynamics(CFD),and the flow fields of suction cylinder-seeder with different socket's radiuses were simulated by *** vacuum is 4kPa and productivity is 350 trays/h,the simulant results show that pressure is uniform,velocity is stable,energy loss mainly occurs near slots and outlet,and there is less interaction among socket-slots;The effect of flow field on socket's radius to the cylinder isn't significant by contrasting different socket's radiuses on the average turbulent kinetic energy,the average vacuum and the maximum difference of velocity behind slots;The experimental results show that the best seeding performance is 84.73%when the socket's radius is *** the performance should be improved,but any sockets are never plugged,which shows enough that the seeder is a very promising precision seeding device.

关键词： Socket-slot Suction cylinder Flow field Numerical simulation

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Discrimination of Ca,Cu,Fe,and Na in Gannan Navel Orange by Laser Induced Breakdown Spectroscopy

Discrimination of Ca,Cu,Fe,and Na in Gannan Navel Orange by ...

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第四届国际计算机与计算技术在农业中的应用研讨会

作者： Yao Mingyin Lin Jinlong Liu Muhua Li Qiulian Lei Zejian Optics-Electrics Application of Biomaterials Lab College of EngineeringJiangxi Agricultural University

Laser induced breakdown spectroscopy(LIBS) has become a powerful tool for the direct analysis of a large variety of materials in order to provide qualitative and/or quantitative ***,there is a lack of information for LIBS analysis of agricultural *** this work a LIBS system has been designed for the discrimination of Ca,Cu,Fe,and Na elements in Gannan Navel *** experimental setup was established by using a Nd:YAG laser operating at 1064 nm and a grating spectrometer with CCD *** LIBS spectra of pericarps and fleshes of Gannan Navel orange were *** typical spectrum lines of mineral elements Ca,Cu,Fe,and Na were chosen and identified,and the relative content of four elements in pericarps and fleshes were compared and analyzed *** results showed that the relative content of elements Ca,Cu,Fe,and Na in pericarps was more than in *** LIBS relative intensity of Na,Fe,Ca,Cu elements in pericarps decreased in turn,while the LIBS relative intensity of Na,Cu,Ca,Fe elements in fleshes increased in *** experimental results also showed that the relative content of mineral elements in farm product may be analyzed fast by LIBS,and the LIBS technique is a novel means for rapid detection the quality of farm product.

关键词： LIBS Gannan Navel orange Mineral elements Discrimination

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Design and Implementation of Crop Recommendation Fertilization Decision System Based on WEBGIS at Village Scale

Design and Implementation of Crop Recommendation Fertilizati...

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第四届国际计算机与计算技术在农业中的应用研讨会

作者： Hao Zhang Li Zhang Yanna Ren Juan Zhang Xin Xu Xinming Ma Zhongmin Lu College of Information and Management Science Henan Agricultural University College of Agronomy Henan Agricultural University Hua County Agricultural Technology Popularization Center

To study crop recommendation fertilization of the rural farmers as the main in our country,the paper took towns and villages of Hua County as the study area,took recommendation fertilization of wheat,maize and peanut as the study object,designed model components of crop balance fertilization by using Object-Oriented technique,and developed the decision-making system about crop recommendation fertilization based on ArcGIS Server at village *** decision-making system realized farmland nutrient management and fertilization recommendations decision-making according to soil output capacity,agricultural production level and crop target *** was successfully applied in crop production in Hua *** research results show that the system has the characteristic of better expansibility than before,and it is significantly simple and practical to reduce crop production cost and increase agricultural production efficiency,which provides technical support for crop fertilization decision-making and is significant to improve agricultural ecological environment and increase the comprehensive production capacity of farmland.

关键词： Nutrient balance model Fertilization decision-making Crop WEBGIS Village scale

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Risk Analysis of Aedes triseriatus in China

Risk Analysis of Aedes triseriatus in China

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第四届国际计算机与计算技术在农业中的应用研讨会

作者： Jingyuan Liu Xiaoguang Ma Zhihong Li Xiaoying Wu Nan Sun Institute of Health Quarantine Chinese Academy of Inspection and Quarantine College of agriculture and biotechnology China Agricultural University Shanghai Entry-Exit Inspection and Quarantine Bureau

Aedes triseriatus(Say),the eastern treehole mosquito(Diptera:Culicidae),is an important medical vector transmitting the LaCrosse encephalitis(LAC) and West Nile Virus,distributed in north America,which ever caused the LAC epidemic in east and central *** the medical-vectors intercepted data of Sino-North America trade at port,it was confirmed that it is possible for *** to invade China by cargoes,imported timbers,containers,*** life cycle of *** is closely related to the temperature and *** models were *** model was used to analyze the possible colonized area of *** in China,the epidemic risk of LAC encephalitis transmitted by *** was analyzed by MaxEnt model,and ArcGIS9.2 was used to analyze the model *** purpose of this research is to establish a superposition model on the risk analysis of *** result shows that the eastern treehole mosquito could colonize in *** high risk areas of LAC encephalitis are in Yunnan,Sichuan,Guizhou,Chongqing,Hubei,Anhui,Jiangsu,Zhejiang,Jiangxi,Hunan,Guangxi,Guangdong,Fujian,Hainan,Taiwan;South of Shanxi,Henan,Shandong;Southeast of Liaoning provinces;The medium risk areas covers most of Shanxi,Shaanxi,Hebei,Tianjin,Jilin,Heilongjiang;South of Xizang,Gansu,Ningxia,Qinghai;North of Sichuan,Liaoning,Shandong,Henan,Middle of Neimeng and parts of southwest Xinjiang *** low risk area includes north of Xizang,Ningxia;South of Qinghai;Middle of Gansu,Neimeng,North of Ningxia,parts of southwest Xinjiang provinces.

关键词： Medical vector Risk Analysis CLIMEX model MaxEnt model ArcGIS software Model superposition

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Characteristics of Soil Environment Variation in Oasis-Desert Ecotone in the Process of Oasis Growth

Characteristics of Soil Environment Variation in Oasis-Deser...

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第四届国际计算机与计算技术在农业中的应用研讨会

作者： Haifeng Li Fanjiang Zeng Dongwei Gui Jiaqiang Lei Xinjiang Institute of Ecology and Geography CAS Graduate School of the CAS Cele National Station of Observation & Research for Desert-Grassland Ecosystem in Xinjiang

Cele Oasis on the southern edge of Tarim Basin was used to investigate the impact of human activity on the soil environment of the oasis- desert ecotone during the oasis expansion *** farmland is extending into the oasis-desert ecotone during oasis expansion,reclaimed farmland and control plots within the ecotone were *** variations in soil moisture,soil nutrients and soil particle-size distribution of the two plots to a depth range of0-100 cm were *** soil moisture of each layer in the farmland to a depth of 0-100 cm differed significantly from that in the control plot;the former was generally higher than the latter in the same layer,particularly during the farming period(***-September).Agricultural soil moisture showed a time-variation rule from multimodal to unimodal with increased *** moisture of the control plot showed a generally monotonic increasing trend with increased depth;however,for the farmland plot,there was a unimodal increasing trend of initial increase and then a decrease with increased *** layer of the farmland plot had a higher soil nutrient composite index than that of the control plot;however,this improving effect of farmland reclamation on soil nutrient conditions in the oasis-desert ecotone decreased with increased *** variation of soil particle-size showed a particular regularity under the influence of cultivation,*** and clay contents in farmland increased obviously and sand contents decreased.

关键词： Soil moisture Soil nutrient Size distribution Cele Oasis

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Fast Discrimination of Mature Vinegar Varieties with VisibleNIR Spectroscopy

Fast Discrimination of Mature Vinegar Varieties with Visible...

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第四届国际计算机与计算技术在农业中的应用研讨会

作者： Yanru Zhao Shujuan Zhang Huamin Zhao Haihong Zhang Zhipeng Liu College of Engineering Shanxi Agricultural University

In order to achieve non-destructive of mature vinegar varieties,a fast discrimination method was put forward based on Visible_near infrared reflectance（NER） *** FieldSpec3 spectrometer was used for collecting20 sample spectra data of the three kinds of mature vinegar *** principal component analysis（PCA） was used to process the spectral data after pretreatment using average smoothing method and multiplicative scatter correction（MSC） method,and principal components（PCs） were selected based on accumulative reliabilities.A total of 60 mature vinegar samples were divided into calibration sets and validation sets randomly,the calibration sets had 45 samples and the validation sets had 15 *** stepwise discriminant analysis was trained with five PCs in calibration sets as the inputs,and mature vinegar varieties as the *** stepwise discriminant analysis model was built for discrimination of mature vinegar variety,and the model contains 15 samples in the validation *** result showed that a 100%recognition ration was *** BP-ANN model for discrimination of mature vmegar varieties were built based on PCA and the stepwise discriminant analysis,then the model was tested with the 15 sample in the validation *** result showed that a 100%recognition ration was achieved with the threshold predictive error ±*** based on five principal components had a higher prediction accuracy and efficiency more than the BP neural network *** could be concluded that PCA combined with stepwise discriminant analysis and BPANN was an available method for varieties recognition of mature vinegar based on NCR spectroscopy.

关键词： VisNIR spectroscopy Mature vinegar variety Principal component analysis Stepwise discriminant analysis BP neural network

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Analysis on Dynamic Characteristics of Landscape Patterns in Hailer and around Areas

Analysis on Dynamic Characteristics of Landscape Patterns in...

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第四届国际计算机与计算技术在农业中的应用研讨会

作者： Hongbin Zhang Guixia Yang Qing Huang Gang Li Baorui Chen Xiaoping Xin Hulunber Grassland Ecosystem Observation and Research Station Key Laboratory of Resource Remote Sensing and Digital Agriculture Ministry of Agriculture Chinese Academy of Agricultural Science Insititute of Agricultural Resource and Regional Planning

This paper analyzed the spatial-temporal dynamic changes of landscape patterns in Hailer and around ***,landscape patterns types of research area were divided into water,sand,farmland,city and grassland based on remote sensing images of 1986,1991,1996 and 2001 and field *** the grassland was classified into higher coverage grassland,high coverage grassland,medium coverage grassland and low coverage grassland by Normalized Difference Vegetation ***,the spatial-temporal dynamic changes of above-mentioned eight kinds of landscape patterns were analyzed using landscape ecology *** results indicated that human activities intensified significant from 1986 to 2001 in research *** area of grassland landscape decreased quickly,and the fragmentation extent *** dominant landscape in research area changed from higher-high coverage grassland to medium-low coverage *** expansion of sand landscape is obvious in periphery of road,city and *** grassland vegetation degenerated *** of city landscape lightened,and city landscape patches tended to decrease and *** development pattern of research area is in a stage that is transforming from extensive pattern to intensive urbanization pattern.

关键词： Landscape patterns Hulunbuir Spatial-Temporal Dynamic

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Study on Spatial Scale Transformation Method of MODIS NDVI and NOAA NDVI in Inner Mongolia Grassland

Study on Spatial Scale Transformation Method of MODIS NDVI a...

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第四届国际计算机与计算技术在农业中的应用研讨会

作者： Hongbin Zhang Guixia Yang Qing Huang Gang Li Baorui Chen Xiaoping Xin Hulunber Grassland Ecosystem Observation and Research Station Key Laboratory of Resource Remote Sensing and Digital Agriculture Ministry of Agriculture Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning

Based on MODIS NDVI and NOAA NDVI datum,covering the primary grassland types of Inner Mongolian in growing seasons from 2000 to2003,this paper analyzes annual variation rule of the relationship between MODIS NDVI and NOAA NDVI *** use the theory of statistics to discuss the spatial scaling methods between different resolutions images of remote sensing in large-scale spatial *** the same time,we build spatial scaling model by MODIS NDVI and NOAA NDVI datum of July and August in 2002,and apply it to the 2003 's NOAA NDVI datum,then take the survey datum in field to validate the precision of the *** result indicates that this spatial scaling method is effective,and the model could be applied to other *** method makes it scientific and effective to analyze and compare the result of monitor by NOAA NDVI and MODIS NDVI of different times in grassland.

关键词： Spatial scaling grassland remote sensing MODIS NOAA

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Precision Drip Irrigation on Hot Pepper in Arid Northwest China Area

Precision Drip Irrigation on Hot Pepper in Arid Northwest Ch...

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第四届国际计算机与计算技术在农业中的应用研讨会

作者： Huiying Yang Haijun Liu Yan Li Guanhua Huang Fengxin Wang College of Water science Beijing Normal University China National Laboratory of Soil Erosion and Dryland Agriculture on the Loess Plateau College of Water Conservancy & Civil Engineering China Agricultural University

An experiment was conducted to study the effects of different soil water potential（SWP） on soil water content,hot pepper's yield,water consumption and water use efficiency（WUE） under plastic-mulched drip irrigation in the North-West China in order to find a suitable SWP to guide the pepper *** treatments were set based on SWP,they are-lOkPa（Nl）,-20kPa（N2）,-30kPa（N3）,-40kPa（N4） and-50kPa（N5）.A control treatment（N6） was set based on local irrigation practice,*** *** was measured using tensiometers at 0.2 m depth immediately under drip *** leaf area,plant height,soil water content,yield and total soluble solid（TSS） were measured,soil water content and water use efficiency were *** shows that the differences in leaf area index and plant height are not significant（P>0.05） among treatments of N1,N2,N3 and *** the pepper yields,WUE and TSS are higher for treatments N3 and *** SWP at-50 kPa greatly decreases crop yield and ***,we recommend-30 40 kPa as the irrigation threshold for pepper cultivation under mulched drip irrigation in arid areas of the North-West China.

关键词： Soil water potential yield water use efficiency mulched drip irrigation Northwest China

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Monitoring the Plant Density of Cotton with Remotely Sensed Data

Monitoring the Plant Density of Cotton with Remotely Sensed ...

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第四届国际计算机与计算技术在农业中的应用研讨会

作者： Junhua Bai Jing Li Shaokun Li Institute of Crop Sciences Chinese Academy of Agriculture Sciences State Key Laboratory of Remote Sensing Science Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University College of Agricultural Sciences of Shihezi University

PDC（Plant Density of Cotton） was an essential parameter for estimating the cotton yield and developing the zone-management *** paper proposed a new method to retrieve PDC from the satellite remote sensing *** thirteen fields of Xinjiang Production and Construction Corps（XPCC）(total 630 hm) were selected as the study area,where the sowing date,emergence date,and PDC were *** on the investigation data the linear models to estimate PDC are established using EVI and DEVI *** results indicated that the difference of seedling size caused by the emergence time decreased the estimation accuracy of *** improve the estimation accuracy the partition functions were established in terms of sowing *** is capable of reducing the influence of soil background significantly and it can bring the monitoring time forward from June 9 to May 24 in this *** results indicated that the optimal time monitoring PDC would be from squaring to full-flowering of cotton growing period.A demonstration to monitor PDC was taken on June 9 in the 148 farm of *** can be concluded that the emergence time and the non-cotton background were the main factors affecting the monitoring accuracy of PDC,and the partition function with the emergence time could improve the estimation accuracy,and DEVI could make the monitoring time forward,and the optimal monitoring time was from the squaring stage to the full-flowering *** research provides an efficient,rapid and intact way to monitor PDC,and it is significant for operational application at a regional scale.

关键词： Cotton Plant Density Remote sensing

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