摘要： <正>研究了云南省思茅松脂松节油群体的相对密度、折光率、初馏点、馏程体积、旋光度和化学组成等物理和化学特征差异。结果表明：思茅松松节油化学组成种源变异丰富，松节油的旋光度是思茅松地理种源的指纹标记。根据组成和依产地从南到北的顺序，思茅松松节油可分为高α-蒎烯、高β-蒎烯和高3-蒈烯3类，前两类优级品的质量指标优于GB/T12901-91标准要求，第3类的折光率超过GB，/T12901-91标准上限。3类间的4项质量指标、特征组分含量差异极显著；旋光度都为右旋，且差异高度显著。依产地由南向北r蒎烯含量递减：91.08%，70.90%，42.55%；8一蒎烯递增：2.46%，21.94%，36.68%；3一蒈烯依次递增：0.62%，2.79%，11.51%；第3类的p水芹烯和异松油烯显著高于前两类；单萜质量分数在98.74%～99.79%，而倍半萜质量分数只有0.21%～1.29%。

Abstract: This paper briefly introduced the compose of the power source system for the hydrostatic transmission. The primary components in the system like hydraulic accumulator and hydraulic pump had been analyzed and selected. The relationship between parameters such as polytropic exponent,charge volume, effective volume and pressure ratio of accumulator, and influence on energy density were particularly detailed analyzed.

中图分类号: 

• TH138