An Elizabethtown College professor has developed an embedded sensor that functions in cement much like a thermometer in the Thanksgiving turkey.
“The thermometer indicates if the turkey is done by measuring its internal temperature,” said Nathaniel Hager III, an adjunct faculty member in Elizabethtown’s physics and engineering department. “The embedded sensor does the same thing in concrete by monitoring how quickly water involved in the curing process is chemically combining with portland cement.”
Hager’s research, conducted with business partner and chemist Roman C. Domszy, involves embedding a disposable sensor in a concrete structure when the cement is poured. “A fast electrical pulse is bounced off the sensor, producing a reflected pulse that contains molecular signals due to unreacted water and water combining with portland cement,” Hager said. “Tracking these two signals along with cure time provides a better understanding of the cure process and identifies irregularities that lead to improper cure. Essentially, we’re looking for the signals that correspond with cement strength. If we don’t get them, we have to trust the signals to tell us that something is wrong.”
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In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
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In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
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The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
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