Paper regards as CO_2 expander is one of the key components for improving the performance of CO_2 heat pump system, internal expansion in expander involves the transformation from the supercritical to subcritical, so it has the complex mechanism.

Analysis and Treatment of Expander's Trouble in Middle Pressure Deep Refrigerating Producing Nitrogen System;

Expander alteration for liquid oxygen production increase of 6000m~3/h air separation unit;

Experimental research on carbon dioxide rotary expander;

Study on expansion mechanism and process optimization of puff;

A new expansion mechanism was deduced that the expansion took place not only between the layers but also in the vacancy left by the ash vaporizing, and the demo.

The expansion mechanism of the different materials and their possible applications were described in detail.

The expanding mechanism of popularly used expanding materials and affecting issues were focused on.

This paper discuss the expanding mechanism and typical properties of steel slag expansive cement.

Fractal geometry and viscoelasticity analysis of the deformation of expansive hardened cement paste :analysis of the expansive mechanism of hardened cement paste with double expansion sources of entringite and brucite;

The expanded and overstaffed organizations are very harmful,because they have caused many difficulties for the state finance,further burdened the people,they have also made the bureaucracy rampant and the administrative efficiency low.