The paper will briefly reviews the basis of the grain reform policy and then analyzes the historical process in the change of the agricultural structure . after econometrical analysis on the effects of the reform and the cost - based comparative analysis on the advantage of the main crop in zhejiang province , we conclude with some advice on optimizing the agricultural structure in the district 本文在简单回顾与评述粮改政策的基础上，分析了浙江农业结构变化的历史进程，并通过计量经济学方法探讨了粮改对农业结构调整的影响程度，以及基于成本比较分析了浙江主要农作物的国内和省内区域优势。
Right to use environmental capacity is distributed to users in form of emissions permit and the emissions permit can be traded as a commodity on the market , this has be called a trade system of right to use environmental capacity . the trade system of right to use environmental capacity was firstly brought forward as a kind of economist means used in environmental management by environmental economist . it was confirmed as a legal system 环境容量使用权交易制度,许多学者称之为排污权交易制度或许可证交易制度,是指在特定的区域内,根据这一区域环境质量的要求,确定一定时期内区域环境所能容纳的污染物的总量,以发放许可证的形式将这些排污许可量分配给各排污单位,并允许许可量在市场上进行交易。
For the image with random field feature , the description language is probability distribution model , and the description length equals the negative base - two logarithm of the probability of the image data ; for the region homogeneity properties of active contour , the description language is chosen as a sign gradient map , and the description length is the summation of sign gradient inside the active contour ; for the active contour regularity , the description language is smoothness , and the corresponding description length is the length of active contour curve 随机场图像的描述语言采用概率分布模型，描述长度是围道内外区域中图像数据概率的以2为底对数的负数；活动围道区域一致性的描述语言为有符号的梯度图，描述长度是围道内区域有符号梯度的总和；围道形态的描述语言采用平滑性，描述长度正比于围道的长度。
Facing to the reduction of the water diversion from the yellow river for hetao irrigation district inner mongolia autonomy , and giving attentin to agriculture production and improvement of salinization , this paper researches optimization model of district water - saving irrigation water management . the paper also quests for the optimization model of crop irrigation system and the optimization irrigation strategy aiming at the short of water for agriculture . in order to save water and use water high efficiently , this paper researches the change regulation of irrigation system of spring - wheat that is the important crop in the irrigation districted establishes the multidimensional dynamic model of irrigation rules of spring - wheat . lt also makes the simulation model of salt leaching of fall irrigation rules during non - growing period , and sorts the elements influencing water - saving of irrigation system 在内蒙古河套灌区的引黄水量减少又要兼顾灌区的农业生产和土壤盐渍化向良性发展的形势之下，本文针对灌区内区域灌溉水管理的现状，对灌区内区域节水灌溉水管理优化模型进行了研究。研究针对农业水资源短缺的现状，在节水灌溉条件下，对作物的灌溉制度进行优化模型探索，寻求最优灌溉策略。全文围绕节水与高效用水，综合应用了系统分析、灌溉排水及节水灌溉的原理和知识，研究了灌域内主要作物春小麦的灌溉制度的变化规律，建立了春小麦灌水制度的多维动态优化模型；建立了非生育期的秋浇制度的盐分淋洗模拟模型；对节水灌溉水管理的影响因素的重要性进行了排序研究。
After being directed against the accession to the wto of our country , the environmental impact on enterprise of our country and challenge of international economy , the author thinks that the enterprise internationalization is the inevitable choice of the large - scale enterprise after the accession to the wto of our country : first , it is becoming fiercer to compete at home ; the enterprise internationalization , help to top various kinds of trade barriers after seconding , join wto , protect the foreign export market ; moreover , area integrate frame organization of economic relations make and internationalize and develop wto 并在此基础上提出了我国企业国际化存在的问题。针对我国加入wto后，国际经济环境对我国企业的影响和挑战，笔者认为企业国际化是我国加入wto后大型企业的必然选择：一是国内竞争日趋激烈；二是加入wto后企业国际化，有利于突破各种贸易壁垒，保护国外出口市场；再者， wto框架内区域一体化经济组织也使国际化发展成为企业克服贸易转移效益的重要手段。
