duty ratio
5.By controlling the length-width ratio of grating electrode and the parameters of potential pulse,the alternated structure of the positive and negative ferroelectric domains,with the duty ratio of 1∶1,can be obtained on the crystal plate surface or in certain depth of the crystal,therefore the qusai-phase matching can be achieved.
6.The optimum bath composition, addition agent and pulse parameters were suggested, The results showed that fine and smooth plating layer can be electroplated in ZnCl_2—NH_4Cl bath containing surfactant by applying pulse current at a frequency of 100 Hz, duty ratio 10% The pulse plating has advantages over the direct current plating.
8.Next, during school study, be released from production to take on other duty gives birth to more study and the time that think, can much on fundamental project take a moment, the odds ratio that although be the same as practice,is united in wedlock is inferior, but laid the foundation that go further however.
