用手中之笔 琢美好心灵——职校生操行评语不容忽视

“操行评语”是一把双刃剑，评好评坏对学生的影响很大。千篇一律，大话、套话连篇的评语根本起不了激励、鞭策学生进步的作用。正确的做法是，一要熟悉学生、真正了解学生；二要动之以情，晓之以理．做到称呼亲切、赞扬动情、批评含蓄。只有这样．才能使操行评语发挥作用。     

Modeling of mass transfer characteristics of bubble column reactor with surfactant present

INTRODUCTION mass transfer coefficient, kLa, which depends fun- damentally on the superficial gas velocity and on Bubble columns are widely used in the the physical properties of the absorption phase.chemical industry where heterogeneous gas-liquid Numerous correlations have been proposed for theor gas-solid reacti…     

Modeling of mass transfer characteristics of bubble column reactor with surfactant present

Danckwert's method was used to determine the specific interfacial area, a, and the individual mass transfer coefficient, kL, during absorption of CO2 in a bubble column with an anionic surfactant in the carbonate-bicarbonate buffer solution and NaAsO2 as catalyst, the presence of which decreases the specific interfacial area and the individual mass transfer coefficient. The specific interfacial area and the individual mass transfer coefficient increase with increasing superficial gas velocity. The specific interfacial area decreases whereas the individual mass transfer coefficient increases with increasing temperature. The results of experiments were used to determine the dependence of a, kL, and kLa on the surface tension, the temperature of the absorption phase, and the superficial velocity of the gas. The calculated results from the correlation were found to be within 10% deviation from the actual experimental results.     

用手中之笔琢美好心灵——职校生操行评语不容忽视

"操行评语"是一把双刃剑,评好评坏对学生的影响很大.千篇一律,大话、套话连篇的评语根本起不了激励、鞭策学生进步的作用.正确的做法是,一要熟悉学生、真正了解学生;二要动之以情,晓之以理,做到称呼亲切、赞扬动情、批评含蓄.只有这样,才能使操行评语发挥作用.