Tornadoes and severe thunderstorms kill people and damage property every year. Estimated U.S. insured losses due to severe thunderstorms in the first half of 2016 were $8.5 billion. The largest U.S. impacts of tornadoes result from tornado outbreaks, sequences of tornadoes that occur in close succession. Last spring a research team led by Michael Tippett published a study showing that the average number of tornadoes during outbreaks—large-scale weather events that can last one to three days and span huge regions—has risen since 1954. But they were not sure why.
Guillaume Bal, Professor of Applied Mathematics, has been elected a fellow of the American Mathematical Society (AMS) "for contributions to inverse problems and wave propagation in random media". Prof. Bal's research interests focus on Partial Differential Equations; mathematical analysis of inverse problems, including hybrid inverse problems and inverse transport problems; applications in medical and geophysical imaging; equations with random coefficients and propagation of stochasticity; convergence to deterministic or stochastic models; and wave propagation and imaging in heterogeneous media.
Yuan Yang, assistant professor of materials science and engineering, has developed a new method to increase the energy density of lithium (Li-ion) batteries. He has built a trilayer structure that is stable even in ambient air, which makes the battery both longer lasting and cheaper to manufacture. The work, which may improve the energy density of lithium batteries by 10-30%, is published online today in Nano Letters.
APAM Faculty and Research Scientists were honored at the SEAS 2016 Faculty Excellence Celebration. "We congratulate our colleagues on their outstanding research and scholarship, which have been rightly acknowledged by some of the world’s most prestigious institutions and organizations, as well as their excellence in teaching, recognized by Columbia University." - Dean Boyce
A team led by Nanfang Yu, assistant professor of applied physics, has discovered a new phase-transition optical material and demonstrated novel devices that dynamically control light over a much broader wavelength range and with larger modulation amplitude than what has currently been possible.