类比方法研究物理问题一例——重力加速度分布的计算

通过一例——推求地球表面重力场分布,说明类比方法在物理教学研究中的作用.     

Ammonia-based thermochemical transformers

The implementation of thermochemical systems based on the reaction between chlorides and ammonia involves certain unusual aspects of thermodynamics and reactivity as well as peculiarities in the evolution of the grain texture and of the beds during the reaction. It is the evolution of the beds that is the most unusual, calling for appropriate solutions involving new implementations of porous beds with optimal characteristics of elasticity and heat and mass transfer. The choice of either multi-effect or multi-salt systems depends on the experimental performances of laboratory pilot systems currently under test or development, and on the real costs derived from experimentation with industrial prototypes.