LPI Seminar Series2017
LPI seminars will be held on Thursdays.
LPI seminars are held from 3:30–4:30 p.m. in the Lecture Hall at USRA, 3600 Bay Area Boulevard, Houston, Texas. Refreshments are served at 4:30 p.m. For more information, please contact Georgiana Kramer (phone: 281-486-2141; e-mail: firstname.lastname@example.org) or Patricia Craig (phone: 281-486-2144; e-mail: email@example.com). A map of the Clear Lake area is available here. This schedule is subject to revision.
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- Thursday, February 16, 2017 - Lecture Hall, 3:30 PM
Qiang Zhu, University of Nevada, Las Vegas
Evolutionary Crystal Structure Prediction: From Complex Crystals to Materials Defects
Knowing the atomic structure of a material or mineral offers a deeper understanding of its macroscopic physical phenomenons and its connection to our planet's architecture, composition and evolution. There have been tremendous progresses in the accurate prediction of crystal structures from first principles based on a variety of global optimization methods combing quantum mechanical calculations. In this talk, I will review the structure prediction methods based on evolutionary algorithms developed in my group, and its applications to study the minerals and organic crystal polymorphism at ordinary and extreme conditions. Furthermore, I will discuss its recent extension to study the highly complex interface in different solids. The encouraging results so far suggest a major role of this approach in studying the general phenomenon in materials and mineral sciences.
- Thursday, March 2, 2017 - Lecture Hall, 3:30 PM
David Patrick O'Brien, Planetary Science Institute
The Formation and Evolution of the Inner Solar System
In the "classical" model of terrestrial planet formation, planetesimals and planetary embryos accrete together to form the planets, with Jupiter and the other giant planets undergoing minimal migration during that time. The asteroid belt is an excited and depleted remnant of the material originally lying interior to Jupiter. This model can broadly reproduce many of the characteristics of the inner Solar System, but faces difficulties in matching some key details, in particular the small size of Mars compared to Earth and Venus. In the newer "Grand Tack" scenario, the giant planets undergo substantial radial migration during the early stages of terrestrial planet formation. This scenario provides a better match to the small size of Mars, and populates the asteroid belt with material scattered from much wider range of distances from the Sun. I will discuss these models in detail, in particular focusing on the implications for the delivery of water and other materials to the terrestrial planets, and the implications for the taxonomic distribution of asteroids and the collisional/dynamical histories recorded in the meteorite record.