Luna Lu (IMAGE) Purdue University Caption Purdue University researcher Luna Lu has developed technology that could replace methods the construction industry has been using for more than a hundred years to test when concrete structures are ready to take on an external load. Credit Purdue University photo/Rebecca McElhoe Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.