检索结果-南通市图书馆

The Designation Method of Bend Forming Dies for Aluminum Tube of PE-Al-PE Composite Pipe

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

厦门大学学报（自然科学版） 2002年第S1期41卷 159-160页

作者： LIANG Yan-fei, AN Jun (Mechatronics Department, foshan University, foshan 528000, China)

The PE-Al-PE composite pipe is a multiplayer pipe t hat is composed of PE (polyethylene) and Aluminum. Al is inlayed the inner PE la yer and the outer PE layer. In the producing technological process of this kind of pipe the bend forming of Al belt to tube is very important. It is the bend fo rming dies that are used in the process of producing PE-Al-PE pipe that is stu died in this article. To make a elaborate division, these dies can be classified as bending dies and forming dies here. In this paper, the designation of bendin g dies and forming dies that are used in producing technological process of PE- Al-PE pipe is put forward. The process starts from a coil of Al belt, in the ac tion of pulling force, passes between several bending dies to change its shape. The first step is to change Al belt to U shape. A couple of rolling wheels can b e used to shape the Al belt. The Al belt goes between the two rolling wheels, dr ives the wheels, at the same time is formed as the shape of the rolling wheels. Considering of the factors such as spring of the bend Al belt, frictional force between Al and the die, bending force needed to bend Al belt, etc., it must be s haped gradually into U by several dies. The designation of these dies has been g iven in this paper. The next step is to forming the U shape into a circle. The U shape Al belt goes through a round that is formed with a four-roller die, and then is shaped to a circle. Because the latter procedure requires the Al circle has a laminated area to be ultrasonic welded, this die must be designed to let t he two edges of the circle belt to be piled up to a definite width. But except f or the laminated area the other of the circle should be as round as possible. So the four rollers are not the same. The calculation and designation of the rolle rs of this four-roller die has also been given. The designation of the roller w hich is supposed to leave a gap to let the two edges of the circle belt to be pi led up is to make a

关键词： bending forming Al composite pipe

ON THE PRIORI ESTIMATE OF MAXIMUM MODULUS OF SOLUTIONS TO A SYSTEM OF DIAGONALLY DEGENERATE ELLIPTIC EQUATIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2003年第4期16卷 446-452页

作者： WANG Xiangdong RONG Haiwu LIANG Xiting (Mathematics Department of foshan University, foshan 528000, China) Mathematics Department of foshan University Foshan 528000

In this paper we first give an a priori estimate of maximum modulus ofsolutions for a class of systems of diagonally degenerate elliptic equations in the case of p > 2.

关键词： system of diagonally degenerate elliptic equations generalized solution priori estimate

在线全文

学校读者我要写书评

暂无评论

二维实体布局中实体初始合理摆放位置的研究

计算机工程 1997年第5期23卷 48-51页

作者：邱英汉佛山大学计算机系佛山528000

文中基于二叉村结构表示二线实体布局问题，证明了若干定理.根据这些定理设计了一个求得实体初始合理摆放位置的算法.实体初始合理位置的求得对以后的实际布局过程非常有利，否则，可能会有麻烦或得不到合理的布局.

关键词：二叉树区域树状态树实体树数据结构

Performance and microstructure of Al-based grinding wheel

在线全文

学校读者我要写书评

暂无评论

金刚石与磨料磨具工程 2008年第S1期28卷 152-155页

作者： Wang Shuangxi~(1,2) Liu Xuejing~2 Niu Shichao~1 Geng Biao~2 (1.South China Institute of Precision Manufacture,foshan,528000,China) (2.foshan Ditiantai Advanced Material Technology Co,Ltd,foshan,528000,China)

Diamond grinding wheel were prepared with Al-based bonding *** microstructure of Al-based diamond grinding wheel was observed by *** fracture morphology,interface between bonding agent and diamond,and the elemental distribution in bonding agent were *** results showed that there were some Al-based agents retained on the diamond ***,Ni formed intermetallurgy phase with Al in the agent and reduced the plasticity of bonding *** service life of this Al-based diamond grinding wheel is proved by the grinding experiments to be three times as long as that of resin-bonded grinding wheel.

关键词： Al-based agent microstructure performance

在线全文

学校读者我要写书评

暂无评论

图书馆信息产品市场推广的新思考

图书馆论坛 2001年第1期20卷 74-75页

作者：刘沫佛山市图书馆佛山528000

在图书馆已有的促销经验基础上 ,指出市场推广业务还应采取合作或外包的方式 ,多途径开辟信息市场 ,只有这样。

关键词：图书馆信息产品市场推广信息市场业务合作

在线全文

学校读者我要写书评

暂无评论

在线订购——期刊采购新模式

图书馆论坛 2005年第1期25卷 109-111页

作者：张萌佛山市图书馆广东佛山528000

电子商务的发展, 期刊在线订购越来越明显地影响着图书馆传统的期刊订购模式, 文章介绍了期刊在线订购的功能、步骤、分类, 并介绍、评价了一些提供期刊订购的网站。

关键词：期刊订购期刊采购图书馆传统新模式文章步骤网站电子商务发展影响

在线全文

学校读者我要写书评

暂无评论

试论图书馆在非物质文化遗产保护中的作用

图书馆工作与研究 2008年第1期 22-24页

作者：刘沫佛山市图书馆广东佛山528000

文章在对非物质文化遗产极其保护工作重要性进行阐释的基础上,指出公共图书馆应积极参与非物质文化遗产的保护与传播,并通过参与'申遗'中资源的发掘与整理,将'活态文化'物化为有形的文献,建立非物质文化遗产的文献保存与开发利用体系,... 详细信息

文章在对非物质文化遗产极其保护工作重要性进行阐释的基础上,指出公共图书馆应积极参与非物质文化遗产的保护与传播,并通过参与'申遗'中资源的发掘与整理,将'活态文化'物化为有形的文献,建立非物质文化遗产的文献保存与开发利用体系,积极做好宣传教育推广工作来发挥自己的作用。

关键词：图书馆非物质文化遗产保护作用

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

儒家管理文化与图书馆管理

图书馆论坛 2002年第4期22卷 9-11页

作者：张红佛山科学技术学院图书馆广东佛山528000

文章将儒家管理文化与图书馆管理结合起来思考 ,认为儒家管理文化中的“有为”、“崇德”、“和谐”思想对2 1世纪图书馆的生存、发展、竞争具有积极的指导意义。论述了儒家管理思想引入图书馆管理。

关键词：儒家管理文化图书馆管理管理模式

Soil erosion risk evaluation using GIS in the Yuanmou County,a dry-hot valley of Yunnan, China

在线全文

学校读者我要写书评

暂无评论

Research in Cold and Arid Regions 2009年第3期1卷 249-257页

作者： HongYi Zhou , HuiXia Li Department of Resource and Environment, foshan University, foshan, Guangdong 528000, China. foshan Univ Dept Resource & Environm Foshan 528000 Guangdong Peoples R China

Soil erosion is a major threat to sustainable agriculture. Evaluating regional erosion risk is increasingly needed by national and in-ternational environmental agencies. This study elaborates a model (using spatial principal component analysis [SPCA]) method for the evaluation of soil erosion risk in a representative area of dry-hot valley (Yuanmou County) at a scale of 1:100,000 using a spatial database and GIS. The model contains seven factors: elevation, slope, annual precipitation, land use, vegetation, soil, and population density. The evaluation results show that five grades of soil erosion risk: very low, low, medium, high, and very high. These are divided in the study area, and a soil erosion risk evaluation map is created. The model may be applicable to other areas of China because it utilizes spatial data that are generally available.

关键词： soil erosion risk spatial principal component analysis (SPCA) GIS Yuanmou County China