检索结果-南通市图书馆

作者： Cui Yunpeng 1 2 Qian ping 1 2 Su xiaolu 1 2 Liu Shihong 1 2 1.Key Laboratory of Digital Agricultural Early-warning Technology Ministry of Agriculture beijing The People’s Republic of china 100081 2. Agricultural Infornmation Institute of Chinese Academy of Agriculture Science beijing 100081 P.R.china

AHP （Analytic Hierarchy Process） is a typical method used in systematic engineering area, which can turn qualitative analysis into quantitative analysis or combines these two analytic methods together. A dynamic evaluation indicator management system designed with the principle of AHP was introduced in the paper, a case study based on the system, the Agricultural Modernization Evaluation Indicators System is also introduced, which implements all the steps of AHP, includes original data management, Indicator sorting, weight calculation, result calculation and graphical output etc., and the details of the construction, calculation and output process of the computer system are also introduced.

关键词： AHP Indicators System Agricultural Modernization Evaluation

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The Applied Research of Image Detection and Analysis Technology in the Automatic Collection of Milk Yield

The Applied Research of Image Detection and Analysis Technol...

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亚洲精细农业与计算机农业应用联合大会

作者： BAO Wen-Xing 1 1. School of Computer Science and Engineering, North university for Ethics, Yinchuan, 750021, china

In the dairy cattle breed ing farms and area, in order to ensure the quality of milk, usually using the centralized mechanized milking system. As the equipment of automat ic metering milk yie ld is usually imported fro m abroad, which is very e xpensive, difficu lt to sustain by the dairy cattle breed ing farms. Thus, it is necessary to find a lo w-cost automated measure ment method. This paper presents a new method of measuring milk yie ld. It use the image analysis and detection technique to analyze the scales and height of liquid in the milk bottles to achieve the record of individual milk production. The mechanized milking system used the glass bottles with the calibration line in Kg measuring individual milk y ield. After the end of a milking process, milk y ield can be read through the manual mode. In order to achieve automatic reading milk yie ld, the digital ca me ra is use to capture the image of the scales and height of liquid in the milk bottles. The image of the scales and height of liquid can be automatic read out by image analysis. The dig it reader system including dig ital image acquisition, image pre-p rocessing, image processing and image recognition four parts. The main use of the image affine t ransformat ion, color image, the image edge detection, image noise filtering, gray histogram image processing, image feature e xtraction, image binarization, image recognition and digital processing functions such as character recognition. The results show that image analysis detection technique can be a better solution of the liquid milk bottles to achieve automatic measuring individual milk y ield. The prec ision of digit reader system can achieve the 5 percent. It can greatly reduce the price of auto matic measuring equipment. Th is method has a very broad application prospects.

关键词： image detection milk y ield automatic metering

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Stochastic simulation of three dimensional variation of soil salinity in a paddy rice soil

Stochastic simulation of three dimensional variation of soil...

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亚洲精细农业与计算机农业应用联合大会

作者： H. Y. LI College of Tourism and City Management Jiangxi university of finance and economics Nanchang china 330013

In this study, 56 EC a profiles, which inversed by the EM38 linear model with Tikhonov regularization method, were selected as the original datum of 3D variation. The spatial variability of EC a at ten depths was simulated by the SGS method. It was shown that not only the spatial distribution characteristics of the original data, but also the volatility of the distribution was well simulated by the SGS method. The layers were stacked one by one. The contour map of EC a displayed a spatial distribution with a high salinity level in the east corner, and low salinity level in the west and northern corner. The salinity in the bottom of southeast is higher, and the salinity distribution for all layers had a similar trend. The EC a value increased with the increase of the soil depth at the vertical orientation.

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Electromagnetic Compatibility Test for Aircraft System

Electromagnetic Compatibility Test for Aircraft System

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Asia-Pacific Conference on Environmental Electromagnetics CEEM’2000

作者： Tiancai Li Jianbo Wang Aidong Zhao Electro-optics Research center Luoyang 471009 P.R.chinaGuorui Chen Northwestern Polytechnical university Xi’an 710072 P.R.chinaPing’an Huang Xi’an Aircraft Company Xi’an 710089 P.R.china

＜正＞The Electromagnetic Compatibility（EMC） test for an aircraft system has no anyavailable and official standards orregulations in china. In connect with EMCtest for a certain aircraft and its electricsubsystems, we put forward a test programfor aircraft AC/DC power supply systemcharacteristics, electromagnetic emission,electromagnetic susceptibility,andelectromagnetic environment and *** not only determine the EMCsafety margin of the aircraft system from asystem viewpoint, but also evaluate theEMC performance of some key airborneequipment from an equipment viewpoint.

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Si中深能级T2对称波函数理论

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物理学报 1983年第10期 1263-1272页

作者：李名复任尚元茅德强中国科学技术大学研究生院中国科学技术大学北京合肥

木文在文献[5,6]所发展的在位缺陷势格林函数方法基础上,进一步讨论Si中短程缺陷势引入的T2对称深能级波函数性质。第一次给出了Si禁带中部很宽能量范围之内T2对称波函数的完整数据。波函数在缺陷最近邻四个格点的占据几率P1有一高达50... 详细信息

木文在文献[5,6]所发展的在位缺陷势格林函数方法基础上,进一步讨论Si中短程缺陷势引入的T2对称深能级波函数性质。第一次给出了Si禁带中部很宽能量范围之内T2对称波函数的完整数据。波函数在缺陷最近邻四个格点的占据几率P1有一高达50％以上峰值。该部分相当于四个最近邻格点指向缺陷的杂化轨道准悬键的T2组合。第0,1,2三个格点壳层波函数占据几率之和约为70％。波函数其余部分较平缓地分布在一相当大空间。波函数的以上特征与禁带中部能量位置关系不灵敏。但在靠近导带Ec和满带Ev的浅能量区,以上P1峰趋于消失,整个波函数在空间的分布趋于平坦。Si空位在禁带引入一个T2对称深能级,位于Ev以上0.51eV处。

关键词：深能级电子能态波函数波动力学壳层棱柱层 T2 Si

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Status and Issues of Digital City Development in china:Findings from a Survey of 30 Cities

Status and Issues of Digital City Development in China:Findi...

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The Sixth World Congress on Computational Mechanics in Conjunction with the Second Asian-Pacific Congress on Computational MechanicsⅠ

作者： Junqing Zhou~(1*), Cheng Wang~1, Ming Zhang~2 1 Digital Engineering Research. center, Huazhong university of Science & Technology, 1037, Luo Yu Road, Wuhan, 430074 china 2 Department of Landscape Architecture & Urban Planning, Texas A&M university, Langford A314, College Station, TX 77843, USA

china’s approval in 2001 of its Tenth Five-Year Plan for national economic development injected a large sum of investments to the application of information technologies. Many Chinese cities have taken the opportunity to construct digital cities as part of their urban development policies. By the end of 2002, 64 cities had had their plans of digital city construction formally approved by the Provincial or the Central government, with a total investment of over 75 billion U.S. dollars. What is the state of the practice in china’s digital city development? How can the strength and weakness of the digital city projects be evaluated? How much regional variations in digital capacities are there among cities in different provinces and what factors may account for the variations? How effective is digital city construction as a policy to stimulate economic development and to improve city management and services? How does the new process of informationalization in digital cities interact with the traditional process of urbanization in physical cities? What are the implications of the interaction for urban planning, land and resources management, and urban policy making? This paper reports a study addressing these questions. The study was based on a survey of 30 Chinese cities where there were established digital city programs. These cities are spread out in 20 provinces across the nation and represent a full range of large, medium, and small-sized urban areas. Combining data collected from National Statistical Bureau, Central and Provincial Governmental agencies, and local cities, the study developed an indexing system to evaluate digital city development in the 30 cities. Development of the index incorporates 72 urban indicators in four categories: urban infrastructure, economic eanacitv, information canacitv, and sustainabilitv.

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FORWARD成像测井资料处理软件应用与效果分析

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天然气地球科学 2004年第5期15卷 549-552页

作者：唐为清金勇张世刚马飞石油大学(北京)数据中心FORWARD开发组北京100083

成像测井测量的物理信息可以表征井壁附近地层的导电特性和声波传播特性。利用这些测量特性可以得到岩性、沉积构造特征和裂缝等信息。FORWARD地质综合评价平台的成像资料处理软件和平台的其他评价软件为地质评价提供了有用的工具。给... 详细信息

成像测井测量的物理信息可以表征井壁附近地层的导电特性和声波传播特性。利用这些测量特性可以得到岩性、沉积构造特征和裂缝等信息。FORWARD地质综合评价平台的成像资料处理软件和平台的其他评价软件为地质评价提供了有用的工具。给出了各种地质构造在成像测井成像图上的显示特征,同时给出了泥质条带和各种裂缝、断层、层理、裂缝的有效性判别,还给出了沉积旋回和储层综合评价的典型示例。

关键词： FORWARD平台成像测井沉积构造裂缝

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A Kind of Model Predictive Control System for Paddy Drying Process

A Kind of Model Predictive Control System for Paddy Drying P...

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亚洲精细农业与计算机农业应用联合大会

作者： SHEN Wenhao 1 LI Changyou 1 ZHANG Senwen 2 BAN Hua 1 1Key Laboratory of Key Technology on Agricultural Machine and Equipment (South china Agricultural university) Ministry of Education Guangzhou 510642 P.R. china 2Ji’Nan university Guangzhou 510632 P.R. china

Grain drying is a heat and mass transferring process in a multivariate-coupling, nonlinear, long-delay and unsteady state. A precise and practical control system is necessary for achieving the drying goals. Model predictive control system has been developed to an influential method on both theory and application as an optimized control strategy based on model prediction since the late 1970s. It’s especially effective in control multivariate, strong time variation and nonlinear system. Mathematics predictive model , data sampling and transferring mechanism , and progressive optimization strategy were developed to construct a kind of model predictive controller for paddy dryer. Grain deep-bed drying process analytical theory was applied to the moisture content distribution model to predict the future moisture content result according to history information and expected output. The dynamic real-time sampling of moisture contents and data stack saving routine were designed to transfer parameters to processing unit. Feedback compensation was adopted to modify the offset of measured and predicted outputs. It’s optimized in quadratic performance index function after comparing with the set value. Then the control value of next n sampling periods was obtained. And when the measured output values were returned to predictive model, the loops that were "prediction, optimization, execution, output, prediction", acted persistently. As a result, the controller could always supply current optimization control value no matter how much the control members and disturbance changed. The test results show that the control system can work accurately in dynamic temperature variation between –35°C and +40°C and moisture content variation between 8%wb and 35%wb. The ununiformity of output moisture content was less than 1%;the rice cracking increase was less than 3% and the offset of output to expected moisture content is less than ±0.5%wb. So this controller is reliable, stable and accurate

关键词： Paddy drying Control system Model Predictive Control (MPC) Moisture content

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ZERO POINT DRIFT COMPENSATION OF IMPACT-BASED GRAIN FLOW SENSOR WHEN COMBINE HARVESTER TILTED

ZERO POINT DRIFT COMPENSATION OF IMPACT-BASED GRAIN FLOW SEN...

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亚洲精细农业与计算机农业应用联合大会

作者： Hu Junwan 1 Luo Xiwen 1 Chen Shuren 2 Li Yaoming 2 Yang Hongbo 2 1 Key Laboratory of Key Technology on Agricultural Machine and Equipment Ministry of Education. South china Agricultural university Guangzhou 510642 china 2 Key Laboratory of Modern Agricultural Equipment and Technology Ministry of Education Jiangsu university Zhenjiang 212013 china

For assessing effectiveness of precision farming operations, the yield map plays a very important role and it must reflect the true variation of yield in the field. As the most important component of a yield monitor system, it is desirable that the grain flow sensor exhibit a long term accuracy and stable zero-point voltage in different operation states without recalibration. The impact-based grain flow sensors, widely used in several commercial yield monitor systems, fail to give stable accuracy when the combine tilted. The purpose of this paper is to study the effects of combine harvester tilt on the zero point drift of impact-based grain flow sensor,and propose an innovated grain flow sensor design that can compensate the effect of combine harvester tilt on the zero point voltage. With the single plate impact-based grain flow sensor and a electronic campus fixed in a KUBOTA Pro-481 head-feed combine harvester, the zero point voltage of the grain flow sensor was detected while the combine harvester tilted between -15°and +15°. The result showed that there was a linear relationship between the zero point voltage and combine the obliquity, the zero point drift voltage was ±25mV when the combine harvester was tilted at ±15°. With two identical plates were mounted in parallel in front of the outlet of the combine harvester, a dual-plate differential impact-based grain flow sensor was designed to compensate the influences of zero point drift lead by combine tilt. The front plate of the new sensor was used to detect the impact of grain out of elevator, but the zero point corrupted by the pose of combine, and the rear plate was used to detect the zero point drift simultaneously. A differential algorithm could compensate the zero point drift of the new sensor. The experimental results showed that the zero point drift of 2 plates were the same as each other, and thus the overall zero point drift voltage was reduced from ±25mV to ±1mV when Combine tilted at ±15°.

关键词： Impact-based grain flow sensor tilt zero point drift compensation

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