基于"3S"技术的甘肃子午岭自然保护区土地利用变化研究   总被引：1，自引：0，他引：1  

焦明  张世强  刘勇  张培栋  张小文 《草业科学》2007,24(11):14-17

以甘肃省子午岭自然保护区为研究对象,运用"3S"技术,对研究区的地形图、不同时相的TM遥感影像进行数据预处理,并分类提取了研究区2个时段的土地利用信息.对分类信息进行统计分析后并与实地调查数据进行比较,结果表明,近20年来甘肃子午岭自然保护区的森林覆盖面积在稳步提高,乔木林面积明显增加.为甘肃子午岭自然保护区工程的建设提供了基础信息,为林区植物种群生长及分布调查研究提供了宏观数据,并且输出了研究区不同时相土地利用专题图.  相似文献   

北方农牧交错带土地利用结构的线性规划——以定西县为例     

闫丽娟  张恩和 《草业科学》2007,24(8):40-42

探讨了用线性规划方法优化土地利用结构,并以北方农牧交错带定西县土地利用结构的经济效益作为目标函数,以人口和自然条件作为约束条件,进行优化分析,规划结果为定西县土地利用结构由2005年的农、林、草面积比例54:10:36调整为30:13:57.  相似文献   

Moving-Out-Inventory Planning for Steel Plate Products     

LIAO Xiao _Yun  LIU Yan _Ling  WANG Yi _Liang 《保鲜与加工》2002,(1):146-149

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Practical Method of High-Speed Access for Medical Digital Image Sequences     

REN Yong  CHEN Wei 《保鲜与加工》2005,(3):80-83

The high-speed access for medical digital image sequences was restricted to special device and complicated system in the past. The authors present a new method of high-speed access for medical digital image sequences which can be performed on general computer by means of the combination of Serial ATA(SATA) and Redundant Array of Independent Disk(RAID).Then they introduce the scheme of system configuration and software program. Lastly the testing result is given and the speediness,cheapness and conveniency of this method are elucidated.  相似文献   

Distribution Network Structure Planning Based on Improved Immune Genetic Algorithm     

YAN Wei  WANG Li-na 《保鲜与加工》2007,(1):28-31

Distribution Network Structure planning is a complex combinatorial optimization problem,which is difficult to solve properly by using traditional optimization methods.In order to solve this problem,Improved Immune Genetic Algorithm is introduced to the distribution network optimal planning. Improved Immune Genetic Algorithm draws into the immune diversity and antibody's density mechanism to maintain the individual's diversity and remains evolution algorithm's global stochastic searching ability,so it can promote diversity and the whole optimal-searching ability of genetic algorithm.The optimal module takes the minimum annual cost as its object,and the capacity and voltage drop of feeder and the radiation of distribution network as its restrictions.According to the require of radiation of distribution network,the spanning tree of the alternative network is taken as the initial solution to speed up the calculation.And the branch-exchange method is used in designing crossover operator and mutation operator to avoid the radiation checking and enhance the optimizing ability.This algorithm has been illustrated effectively by examples,at the same time,the calculation example demonstrates that,the algorithm has higher calculation speed than the traditional immune genetic algorithm.  相似文献   

Visualization of the FEM Analysis Data of 3D on the Cut Plane     

YUAN Zheng-qiang  ZHANG Zhi-guang  YANG You-fa 《保鲜与加工》2005,(9):102-104

The colored patterns on arbitrary cut plane is an important method in 3D data-field visualization of finite element.By using the technology of the Object-Oriented Programming and the method of scan-line,the colored patterns on arbitrary cut plane are given.The example by the OPENGL of Visual C++ R6 can support the theory satisfactorily.  相似文献   

Study on Landscape Planning of Mourtcainous City     

CAI Yun-nan  GUO Hong-yu 《保鲜与加工》2000,(1):63-68

:In accordance with the problems, occurred in the mountainous city's construction, especially the crises such as the destruction of ecological and humanistic environment, the loss of traditional culture and characteristics and the disorder of urban structure, this paper discusses the distinctive landscape characteristic of mountainous city thoroughly.  相似文献   

A Study on the Method of Time-Resource Optimization of Engineering Projects     

CAO Xiao lin  WANG Jin gen 《保鲜与加工》2000,(2):49-53

This paper investigates the coordinated operation of the progress planning with the resource planning when carrying out engineering projects and puts forward a method of "RSM" under the resource limit conditions. Then, the "RSM" was improved to avoid complicated calculation. This method not only reduces the calculating work by hand but saves computer's memory as well, making the time-resource optimization work more quick and convenient.  相似文献   

A Dynamic Model for Generation Expansion Planning and Algorithm     

Yang Xiutai Nie Duan 《保鲜与加工》1993,(4):6-10

This paper discusses the problem of long-range generation expansion planning. A dynamic model for long-range expansion planning is set up and an algorithm-a two-step programming is presented, which is used here in a case.  相似文献   

AMETHOD OF COMPREHENSIVE EVALUATION TO DEVELOPMENT PROJECT ALTERNATIVES     

Zheng Xiaoqing 《保鲜与加工》1995,(4):9-17

In view of the complication of compreliensive evaluation to development projectplanning alternatives,an AHP model for comprehensive evaluation to the alternatives is advanced,the way of determinating the weight of each index affecting the aIternatives' quality is expounded,and the general methods of evaluating the alternatives with the indexes are given.  相似文献