A method of determining low content sulfur in heavy oils was proposed by designing a new large volume pyrolysis tube and optimizing operation conditions Its practical lower detection limit is 0 5 μg/g, and it has good precision, accuracy and linearity for sulfur mass fraction of less than 10 μg/g sample The method is comparable to other methods or analyzers in the worl

In order to provide a new method of improving the replication fidelity for micro-feature structure parts in injection molding, taking microlens array as an application case, this paper studied the effects of processing parameters on the replication fidelity of micro-feature structure parts using part weight as a quantitative .

The results showed that,after modification, the dispersity of nano-Si3N4 in NBR was improved;the physical properties and dynamic properties of the composite,and the service life of oil seal articles were improved,by adding 0.