Now more than 40 countries are short of water resources ; there are more than 400 cities of water shortage and 108 cities of serious water shortage in china . in order to realize urban sustainable development , based on urban water resources system study on urban development scale 现在全球有40余个国家缺水、亚洲地区一半以上国家处于水荒中生活;我国的680余座城市中目前缺水城市已经高达420余座,严重缺水108座城市。
This paper discussed the model system studies related to the pathway of flavor formation from their individual precursors in thermal reaction savory flavor and the achievement and potent of commercial production of some new natural flavors baaed on the knowledge obtained from model system studies 摘要本文概述了热反应咸味香料中,由前体生成香成分的模型体系研究,以及将模型体系知识用于商业化生产新天然香料方面的进展和潜力。
The system studied by me in which the technology of single chip microcomputer is used combines the principle of wamepebratzler ' s apparatus of measuring shearing strength with the technology of sensor , micro - electronics and computer to study the measure system of tendemess of meat 基于warner - - bratzler剪切仪的工作原理,本系统将传感器、微电子技术与计算机控制技术有机地结合起来,采用单片机控制技术针对肌肉嫩度测量系统进行了具体研究。
The impulsive hybrid differential system studied in this paper is a special but important case of impulsive differential systems with variable structure , its characteristic is that its equations in different time periods may be different and the equation in the latter depends on the former 本文所讨论的脉冲混合微分系统是一类特殊的但很重要的具有可变结构的脉冲微分系统,它的特点就是不同时间段内微分系统可以不同,并且后一时间段的系统依赖于前一时间段。
There are three parts , namely fundamental research , practice illustration research and design principles and means study , just as follow : the part of fundamental research includes the relative conceptions , and the primary features , attributes of the open space at the city gate . the part also explicitly definitizes the study target , meanwhile introduces the conception of integrality and the methodology of system study ; the part of practice illustration research analyze the status dissect of the existing typical open space at the city gate , and scrutinizes the intrinsic reasons form the present problems . moreover , this part also illustrates two city design case , and carries on the dissects of concrete example ; the part of city design principles and means study , means to construct multi - angle , systematize and integrated city design framework for the open space at the city gate 全文结构包括基础研究、实证研究以及设计原则与方法研究三大部分:城市门户开敞空间的基础研究部分,包括城市门户及其开敞空间的相关概念与基本特征、属性,并明确界定了研究客体,引入了整体的观念和系统研究的方法;实证研究部分,剖析两个典型城市门户开敞空间的现状,从现状问题找内在原因,再以两个相关城市设计实践为典型个案进行实例分析与研究;设计原则与方法研究部分,阐释了多视角下系统、整体的“点?线?域”城市设计框架的建构,并以人性化设计、景观意象设计与生态设计三个方面为重点,就城市门户开敞空间设计原则与方法进行归纳、总结与思考,并提出建设性的意见。