Nonnatural amino acid 3-(4-thiazolyl)-D,L-alanine hydrochloride and its four intermediates were synthesized, their structures were detenmined by IR,NMR,elementary analysis and melting point.
The structure and working principle of the devices for melting point measurement by means of thin film comparative method of cryoscopy were introduced.
The variation laws of blast volume,blast pressure,recarburizing rate and silicon loss were studied during the melting process of 5 t cold blast cupola.
In order to increase water speed and turbulivity in ice-storage tank of direct evaporating and external melting ice-on-coil system, cambered baffles are installed in the ice-storage tank.
The illinium electrode produces a slim arc when used in welding.With a high level of compression, it has a bigger melting depth in medium and high currents.
During the process of converter steelmaking,the oxidbillity of slag had an direct influence on the speed of melting slag,the viscosity of slag and the extent of sputter.
Using the modified analytic embedded-atom method (MAEAM), the molecular dynamics (MD) simulation was performed to study the premelting and melting behavior of (001) plane of niobium and tungsten.
When melting cast iron f or rollers in main frequency induction furnace,the recarburization of the molte n iron could be effectively achieved by using new types of recarburizer.