 In my research team, I installed a sensor on Purdue Gateway Complex project. So in this project, we're working with Wilhelm Construction to help them determine the strength of the concrete of the beams under the columns. We placed 12 sensors and six of them in the beam and then six of them in the deck. The reason we put in the beam, because in this particular project, as you can see, the beam is post-attentioning beam. We need to pull the tendon when concrete reaches the 3000 psi. In the past, this is normally done by historical data, but by using this type of sensor, we can know when exactly we reached that magic number and then we can get the construction going so we keep the flow. Traditionally, a concrete is measured by concrete test cylinders and the compressive strength is obtained out of those cylinders. In order to continue building, you need a specific amount of compressive strength so you can wreck your formwork and continue construction. You also need a specific strength to stress post-attention cables which are in the beams behind us. Currently, Wilhelm has been using concrete maturity sensors since 2009 and they give us a more accurate reading of what the in-place strength of the concrete is. The new sensors that we're using today, they're using a different method and it's all about accuracy of in-place testing of the strength of the concrete. It's similar to the principle we used in the highway pavement project. The sensor is made of a material called a piezoelectric. The piezoelectric material can directly convert mechanical energy into electrical or vice versa. So by using this sensor, what we do is we run through an AC current and then to vibrate the sensor. So therefore, the sensors send acoustic elastic wave in the concrete. By measuring the resonant frequency of the concrete with that particular wave, we can understand the intrinsic value of the concrete which is the strength and the stiffness. The methodology that we use currently, the mathematics was like established in the late 50s, early 60s. So something new hasn't happened in concrete maturity since then. So it'll help with the speed and options for contractors to be able to use instead of all the pre-planning that may take place. It might just be decided quicker and say, oh hey, we want to change the concrete mix design for a specific pour like you see. And instead of meeting 28 days prior to it, it'll help with the speed and accuracy of predicting the in-place concrete strength.