水声通信中的编解码及其快速算法的研究

本文针对在水声通信中使用m序列作为编码形式的扩频通信系统进行研究。分析扩频码的产生和序列特点，给出的编码序列搜索，信息解码的解码方法。对其中相关运算给出了快速算法，解决了运算中的瓶颈问题，极大的提高了运算速度，并对长序列的快速相关进行初步探索。     

Benson基团加和方案的极性修正

An empirical method for estimating the standard enthalpy of some polar compounds is presended in this paper, that is
△△fH°(RX/CH3X)= △fH°(RX)- △fH°(CH3X)=a+bIx
where △△fH°(RX/CH3X) represents the standard enthalpy difference between CH3-X and R-X(R=Et, i-Pr, t-Bu, etc). It is a new polarity parameter defined by us. A good result was obtained for nearly 70 polar compounds.