The forces directing these molecular packings are van der waals forces and hydrophobic interactions i n the hydrocarbon part of the molecule 分子的烃基以范德华力相互作用，极性基间主要是静电引力。
2.
The wavelet transform is discussed in the code - width estimation ; and the feasibility and effectiveness of the code - width estimation using the spectrum of the bipolar base - band signal are proved 在参数估计中，主要讨论了小波变换算法在基带信号码元宽度估计中的应用以及利用双极性基带信号的频谱估计码元宽度的可行性和有效性。
