According to the factual situation of catalysts and modified process conditions, this paper discussed all factors which have an influence on the VAc output of gas acetylene fixed bed process, then the optimal ways were put forward to increase VAc output.
通过对四川维尼纶厂催化剂及工艺条件改进的生产实践,结合理论分析,研究了影响用天然气乙炔固定床工艺生产醋酸乙烯(VAc)产量的各种因素,提出了提高VAc产量的合理途径。
Aiming at the difficulty in measuring the vinyl acetate(VAC)polymerization rate on-line in the process of polyvinyl alcohol production,a VAC polymerization rate soft-sensing model is established based on RBF neural network in this paper.
针对目前聚乙烯醇生产过程中醋酸乙烯(VAC)聚合率难以在线检测的情况,提出利用RBF神经网络建立VAC聚合率软测量模型,并运用大量实测数据对RBF神经网络进行了训练和仿真。
Dense clouds of ash were generated during the volcanic eruption.
火山爆发时, 产生了浓密的火山灰云。
THE COMPLEX INFLUENCES OF SOLAR ACTIVITY AND VOLCANIC DUSTY CTOUDS ON THE ABNORMAL CLIMATE OF CHINA FOR SUMMER 1980.
太阳活动和火山灰云对1980年夏我国异常气候的综合影响
The explosion caused a huge black cloud of dust.
火山的爆发造成了一大片黑灰云。
The year after its eruption in 1980, spruce seedlings were coming up in the volcanic ash on Mt. St. Helens.
1980年圣海伦火山爆发之后，仅过一年，云杉幼苗就在火山灰上生长起来了。
/The Flaming Mountain towers over the road at Chiting/Flaming clouds hover thick over it this time of May/So thick are they the mountain is solidly canopied/And birds flying round this spot stay far far away.
“火山突兀赤亭口/火山五月火云厚/火云满山凝未开/飞鸟千里不敢来”。
cloud due to volcanic eruptions
火山爆发所造成的云
portland-pozzolana cement
火山灰质硅酸盐水泥
A volcano belches smoke and ashes.
火山喷出黑烟和灰土。
ash that was thrown By an erupting volcano.
火山爆发喷到空中的灰
The volcano ejected lava and ashes .
火山喷出熔岩和灰。
The village was overwhelmed by ash from the volcano.
村子被火山灰覆盖。
A volcano emits smoke and ashes.
火山散发着烟和灰。
volcanic ash and lava build the mountains that we call volcanoes.
火山灰和火山岩在喷射口堆积构成了火山。
A volcano that vomited lava and ash.
喷出岩浆和火山灰的火山
Lava and ashes erupted from the volcano
熔岩和火山灰从火山中喷出来。
The volcano erupted lava and ashes
火山喷射出熔岩和火山灰。
A siliceous volcanic ash used to produce hydraulic cement.
火山灰水泥，火山石用来生产水硬水泥的含硅火山灰
fly ash and other pozzolans for use with lime
混合石灰用煤飞尘和火山灰