我国城市土地集约利用评价研究综述

文章从城市土地集约利用的内涵、评价尺度、指标体系的构建、评价方法等方面对我国开展土地集约利用的研究及评价工作进行了总结和归纳,得出了对内涵认识多元化、评价尺度广泛、评价指标和理想值均难以选取等特点,并对我国未来城市土地集约利用评价应加强新方法新技术的应用,并充分发挥评价结果在现实应用中的趋势展望.     

热缩催化聚合合成聚天冬氨酸

The Polysuccinimide is Synthesized by means of pyrocondensation catalyze polymerization，using L-aspartic acid as a monomer．Poly-aspartic Acid is achieved by hydrolization of Polysuccinimide．The effect of temperature，time，catalyzer and condition of hydrolization on yield and quality is studied．The research results show that the method has the advantages of simple equipment and high yield．