Lehigh University engineering professor Yujie Ding and his wife, Yuliya Zotova, appeared to be talented researchers dedicated to advancing science, jurors in their federal fraud trial said. But the Upper Saucon Township couple's commitment to a $700,000 NASA research program turned fraudulent, jurors said, when Ding and Zotova failed to tell the space agency that Zotova's role in the project had ended. The jury Friday found Ding and Zotova guilty of six out of 10 counts of wire fraud for sending NASA fake invoices from the research company Ding owned and Zotova controlled.