(1 p.m.)

All Faculty Are Invited to the Final Examination of

**Wenlong Wang**

Graduate Program in Geosciences

October 27, 2016, 1:00 p.m., ROC 2.301T

*Title of Dissertation:*

ELASTIC AND ACOUSTIC WAVEFIELD DECOMPOSITIONS AND APPLICATION TO REVERSE TIME MIGRATIONS

*Student’s Supervising Committee:*

George A. McMechan, Chair

John F. Ferguson

Carlos L. V. Aiken

Tom H. Brikowski

]]>(11 a.m. - 1 p.m.)

We are happy to announce that the Actuarial Student Association will be holding our second meeting of this semester this **Friday October 28th, from 11am-1pm in the Phoenix room (SU 2.508).**

Topics of discussion will include opinions of different exam study materials effectiveness/difficulty level and tutorials of the Coaching Actuaries software (ADAPT, Video Lessons etc.), Infinite Actuary software, as well as access to study manuals and free merchandise.

We will be raffling off some of the merchandise that is limited in stock such as T-shirts and exam software. Also, we will be providing promotional codes for more exam resources which will be available for all that attend. As it is relevant, we will begin by briefly addressing the changes that are being made to the Actuarial exams.

If you have passed an exam and would like to sell/donate your manual, you can do so at the end of the meeting, time permitting.

]]>(12 p.m. - 1 p.m.)

This week we reprise two 20 minute talks from the Society of Exploratoin Geophysics Annual Meeting which was held last week in Dallas.

**Georgia Stuart **

**Mathematics, UTD**

**A two-stage Markov chain Monte Carlo method for velocity estimation and uncertainty quantification**

Bayesian seismic inversion can be used to sample from the posterior distribution of the velocity field, thus allowing for uncertainty quantification. However, Bayesian techniques like Markov chain Monte Carlo (McMC) can be extremely computationally expensive. We propose a two-stage McMC method where an upscaled wave equation solver is used to quickly filter out unacceptable velocity fields, thus reducing the computational expense. We have found that the data generated by the full fine-grid solver is correlated with the data generated by the upscaled solver, so the upscaled solver is a valid filter.

**Matthew McChesney**

**Geophysics, UTD**

**Rate and state flow and deformation simulation of microseismicity with elastic emission wavefield synthesis **

Understanding the flow and deformation that occurs in a reservoir during fluid injection for enhanced oil recovery is critical for maximizing the efficiency of production from unconventional reservoirs. A one-way coupled model for flow and defromation simulation is used for microseismic nucleation and subsequent wavefield modeling of elastic emissions from the microseismic events.

]]>(3 p.m. - 4 p.m.)

**Hao-Pin Wu**

** Department of Mathematical Sciences**

**UT Dallas**

**Brouwer degrees of equivariant maps for solvable and 2-transitive groups revisited**

For more information:** utdallas.edu/nads/**

(11:30 a.m. - 12:45 p.m.)

**Teruaki Kitano **

**Soka University, Japan**

**Introduction to Brieskorn manifolds**

We define Brieskorn manifolds and show several properties of these manifold. This is a background talk and is intended for students.

]]>(11 a.m.)

All Faculty Are Invited to the Final Examination of

**Md Maksudul Alam**

Graduate Program in Molecular and Cell Biology

November 1, 2016, 11:00 a.m., RL 3.204

**Title of Dissertation:**

MITOCHONDRIAL RESPIRATION PROMOTES NON-SMALL CELL LUNG CANCER CELL PROLIFERATION AND FUNCTION

*Student’s Supervising Committee:*

Li Zhang, Chair

John G. Burr

Michael Q. Zhang

Ernest M. Hannig

]]>(1 p.m. - 2 p.m.)

**Teruaki Kitano **

**Soka University, Japan**

**Reidemeister torsions of Brieskorn manifolds**

We consider the Reidemeister torsion for 3-manifolds with SL(2;C)-representations of the fundamental group. This invariant was originally defined in 1930’s. However, it is still important in topology. The purpose of this talk is to show computations of Reidemeister torsions for Brieskorn manifolds and to show algebraic relations among these values.

]]>

(4 p.m. - 5 p.m.)

Dr. Alex Zakhidov (Texas State)

Organic-inorganic halide perovskites made a revolution in thin film solar cells. CH3NH3PbX3 (X = Cl, Br, or I) perovskites made a rapid progress in power conversion efficiency from 3.8% in 2009 up to >22% in 2016. I will make a quick review on that topic and try to explain why this particular class of materials outperforms organic solar cells and what are the challenges facing practical application. In particular, I’ll discuss the mechanism of perovskite thermal decomposition on ZnO electron transport layer (ETL). ZnO ETL for perovskite photovoltaics has a combination of attractive electronic and optical properties: i) the electron affinity of ZnO is well aligned with valence band edge of the CH3NH3PbI3, ii) electron mobility of ZnO is >1 cm2/(Vs), which is a few orders of magnitude higher than that of TiO2 (another popular choice of ETL for perovskite photovoltaic devices), and iii) ZnO has a large band gap of 3.3 eV, which ensures optical transparency and large barrier for the hole injection. Moreover, ZnO nanostructures can be printed on flexible substrates at room temperatures in cost effective manner. However, it was recently found that organic perovskites deposited on ZnO are unstable and readily decompose at >90˚C. In our recent, we further investigate the mechanism of decomposition of CH3NH3PbI3 film deposited on ZnO and reveal the role of the solvent in the film during the annealing process. We also develop a restricted volume solvent annealing (RVSA) process for post annealing of the perovskite film on ZnO without decomposition. I will also present theoretical results of our recent study, where we have predicted the existence of self-trapped polarons in the CH3NH3PbI3 perovskites using DFT+U methodology.

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