In order to improve stability of catalyst, some process methods, such as increasing CO_2 and CH_4 molar ratio, gas space velocity, and reaction temperature, were adopted.

提高原料气中CO_2与CH_4摩尔比，气体空速，反应温度可以提高催化剂稳定性，减缓催化剂的失括速度。

youdao

By studying the filtered starlight, astronomers can determine such a planet's atmospheric composition and also the direction and velocity that any gas lost to space is moving.

通过研究过滤后的恒星光，天文学家确定该行星大气的组成，以及气体被吹入太空的方向以及速率。

youdao

For explosion process of gas cloud in closed vessels, flow field parameters, such as pressure, velocity, density, temperature, concentration and so on, vary with time and space.

对于球形密闭容器内气云的爆炸过程，压力、速度、密度、温度、浓度等流场参数均随时间、空间而发生变化。

youdao