In the liquor of acetic acid,the catalyzed synthesis of m-chlorobenzoic acid by the reaction of m-chlorobenzal dehyde and potassium bromate was studied.
To study the effectiveness of inserting central venous catheter was inserted into pericardial cavity for the drainage and treatment of lung cancer hydropericardium.
A method for fluorophotometric assay of dihydrofolate reductasc (DHFR) activity by the use of fluorescence properties of dihydrofolate (DHFA) and NADPH was developed.
Analysis of the Stem-fillet blend fracture of exhaust valve was conducted by means of macroexamination, microstructure examination, chemical composition analysis and hardness test.
Multiple reignition makes the frequency and amplitude of overvoltage increase and might do harm to transformer coils by cumulative effects for its surge steepness.
The result of experiment show that this algorithm has good robust against JPEG,and frangibility against the familiar attacks,and beseem to selective authentication for image.
The effects of reactant ratio, reaction time, catalyst amount,the species and amount of deaquation reagent on the yield of benzaldehyde 1,3-butanediol acetal were investigated.
Analysis on leakage reasons of chlorine liquefier were anlysed from manufacture, test and application. The liquefier was failure, and the protective measures were put forward.