等静压瓷砖模具制作

本文通过对我国近年来建筑瓷砖市场的需求阐述，针对性地提出了等静压模具的适应性。介绍了等静压瓷砖模具的工作原理，类型、结构形式和制作工艺，以及减小模芯失效的途径和优点。     

Arithmetic computation using self-assembly of DNA tiles: subtraction and division

Recently,experiments have demonstrated that simple binary arithmetic and logical operations can be computed by the process of selfassembly of DNA tiles.In this paper,we show how the tile assembly process can be used for subtraction and division.In order to achieve this aim,four systems,including the comparator system,the duplicator system,the subtraction system,and the division system,are proposed to compute the difference and quotient of two input numbers using the tile assembly model.This work indicates that these systems can be carried out in polynomial time with optimal O(1)distinct tile types in parallel and at very low cost.Furthermore,we provide a scheme to factor the product of two prime numbers,and it is a breakthrough in basic biological operations using a molecular computer by self-assembly.