期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
一种确定土壤有机质含量的新方法——厚度指数法
1
作者 蒋端生 《湖南农业大学学报(自然科学版)》 CAS CSCD 北大核心 2001年第3期209-211,共3页
分析了腐殖质层厚度法和土壤有机质含量法存在的缺陷 ,提出了以土壤有机质含量的厚度为基础 ,以各类土壤中等肥力水平的有机质厚度为标准厚度来计算土壤有机质含量的厚度指数的方法——厚度指数法 。
关键词 土壤有机质含量 厚度指数法 测定方
下载PDF
Effects of material properties on power spinning process of parts with transverse inner rib 被引量:7
2
作者 马飞 杨合 詹梅 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第8期1476-1481,共6页
Material properties of blank have a great effect on power spinning process of aluminum alloy parts with transverse inner rib.By using finite element(FE) and Taguchi method,the effects and significance of five key mate... Material properties of blank have a great effect on power spinning process of aluminum alloy parts with transverse inner rib.By using finite element(FE) and Taguchi method,the effects and significance of five key material parameters,namely,anisotropic index in thickness direction,yield strength,hardening exponent,strengthening factor and elastic modulus on the formability of inner rib,tendency of wall fracture and degree of inhomogeneous deformation of finished spun parts were obtained.The achievements provide an important guide for selecting reasonable spinning material,and are very significant for the optimum design and precision control of power spinning process of parts with transverse inner rib. 展开更多
关键词 power spinning inner rib Taguchi method FEM material properties
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部