Aldehydes are present in exhaust gases during incomplete burning of organic compounds and are also formed by photochemical reaction with hydrocarbons in air. 醛是一类在环境中广泛存在的挥发性污染物,主要来源于汽车尾气、化工、木材加工防腐、吸烟以及大气光化学反应。
After analysis of the end-carboxyl producing reason for different PET process, we get the conclusion of the main end-carboxyl producing reason is the incomplete reaction in PET process by PTA direct polycondensation meth-od. 对不同聚酯工艺端羧基产生的原因进行分析,认为在PTA直缩法聚酯工艺中,端羧基产生的主要原因是反应不完全、剩余羧基进入最终产品。
For the patients in group ⅱ, the anesthesia was incomplete, the muscle relaxation was not good, and intestine stretch reaction was occurred. Ⅱ组有阻滞不全、肌松欠佳及内脏牵拉反应现象。
It has overcome the shortcomings of inhomogeneous composition, incomplete reaction, low reappearance rate and Tc, which has be caused by the solid reaction method. 该方法克服了固相反应法混合不均匀,反应不完整,样品重现性差和Tc较低的缺点;
Three Different Thermodynamic Treatments For Na → Tb Incomplete Ion Exchange Reaction in Y Zeolites Y型沸石上Na→Tb不完全离子交换反应的三种热力学处理
And up to 3.33wt% in 300 ° C while after 108h reaction. This indicated that it was still incomplete to release all of hydrogen though reaction time enough long, poor reaction kinetics may have certain relations with vacuity. 而300℃经108h则可达3.33wt%,表明尽管反应时间充分长,放氢过程仍不完全,动力学性能较差与真空度不够高有一定关系。
The paper deals with the measurement of the heat effect of four organic component reaction system for incomplete reaction process at 170 ℃, atmospheric pressure. 本文是对常压,170℃下,4组份反应体系不完全反应过程热效应测定研究。
The margin of all lesions were clear and complete or incomplete ossify strip were shown on 3 cases. No soft tissue or periosteal reaction could be found in all cases. 所有病灶边界均清楚,其中3例病变周围可见完整或不完整硬化带,全部患者未见明显软组织肿块及骨膜反应。
So the problem is coming that SiO gaseous unstable matter is made in the interface of silicon and silicon dioxide due to silicon and oxygen incomplete reaction when making thermal oxide layer. 因此随之而来的问题是:由于在形成热氧化物的时候,由于硅和氧的不完全反应,在硅和二氧化硅的界面会生成一氧化硅的气态不稳定物质。
But this method needs high reaction temperature, leading to incomplete reaction. So it is difficult to obtain the products of uniform composition. 但是这种方法的反应温度很高,导致反应不完全,难以获得组成均匀的产物。