Internal grinding is more difficult than surface grinding and cylindrical grinding. But littleresearch work in this field has been done. In this paper, based on
New catalysts combined with an organic or inorganic lithium salt (lithium acetate or lithiumchloride) and a conventional catalyst for the transesterification of
This paper proposes a new computer aided pattern design system(CAPDS)in which a uniformmathematical expression is used to construct different objects. In the ge