# Academic

## Monday, January 30, 2017

### Expanders and Extractors

Workshop | January 30
–
February 3,
2017 *every day* |
Calvin Laboratory (Simons Institute for the Theory of Computing)

Simons Institute for the Theory of Computing

This workshop will focus on explicit constructions of graphs and functions with pseudorandom properties. There will be two main themes related to each object in the title. For expanders, these will be proofs of existence of expander graphs using lifts, a la Bilu-Linial and Marcus-Spielman-Srivastava, and the possibility of using the method to obtain explicit constructions of Ramanujan expanders... More >

### Simons Institute Workshop: Expanders and Extractors

Seminar | January 30 | 9:30 a.m.-5:30 p.m. | Calvin Laboratory (Simons Institute for the Theory of Computing), Auditorium

Various, Various

Jan. 30 – Feb. 3, 2017

This workshop will focus on explicit constructions of graphs and functions with pseudorandom properties. There will be two main themes related to each object in the title. For expanders, these will be proofs of existence of expander graphs using lifts, a la Bilu-Linial and Marcus-Spielman-Srivastava, and the possibility of using the method to obtain explicit... More >

### Combinatorics Seminar: Combinatorial Physics: you only live twice

Seminar | January 30 | 11:10 a.m.-12 p.m. | 939 Evans Hall

Emmanuel Tsukerman, UC Berkeley

(Please note the unusual time of this talk.)

A sneak preview into the beauty and wonder of Combinatorial Physics. I will talk about Random Matrix Theory, heavy nuclei, Dyson's Threefold way, Macdonald polynomials, Heisenberg XX spin chain, localization and dualities.

### The Effect of Cumulative Advantages on the Stability and Dynamics of Collaborations in US Physics, Chemistry and Sociology from 1980 to 2015

Seminar | January 30 | 12-1 p.m. | Goldman School of Public Policy, 355 GSPP, 3rd floor,1893 LeRoy Ave

Oliver Wieczorek, Visiting Scholar, Sociology, Bamberg, Germany; Heiko Heiberger, Postdoctoral Researcher,Department for Micro-Sociology at University of Bremen, Germany

Center for Studies in Higher Education

In academia, effects of “cumulative advantage” are well studied in regards to different types of resources. Those resources are money, influence, number of collaborations, number of publications and the impact of the findings. In other words: the rich and famous departments and researchers get richer and more famous over time while the poor get (relatively) poorer. This effect is visible on both... More >

### Graduate Student Seminar

Seminar | January 30 | 12-1:30 p.m. | 489 Minor Hall

Brian Cheung, Olshausen Lab; Dylan Paiton, Olshausen Lab

Neuroscience Institute, Helen Wills

Graduate student Brian Cheung will be speaking on:

Emergence of foveal image sampling from learning to attend in visual scenes

&

Graduate student Dylan Paiton will be speaking on:

Towards understanding how extrastriate feedback shapes a V1 neuron's visual response characteristics

### Combinatorics Seminar: Dyck paths and positroids from unit interval orders

Seminar | January 30 | 12:10-1 p.m. | 939 Evans Hall

Anastasia Chavez and Felix Gotti, UC Berkeley

It is well known that the number of non-isomorphic unit interval orders on $[n]$ equals the $n$-th Catalan number. Using work of Skandera and Reed and work of Postnikov, we show that each unit interval order on $[n]$ naturally induces a rank $n$ positroid on $[2n]$. We call the positroids produced in this fashion unit interval positroids. We characterize the unit interval positroids by describing... More >

### String-Math Seminar: Cluster Theory of the Coherent Satake Category

Seminar | January 30 | 2-3 p.m. | 402 LeConte Hall

Harold Williams, University of Texas

We discuss recent work showing that in type A_n the category of equivariant perverse coherent sheaves on the affine Grassmannian categorifies the cluster algebra associated to the BPS quiver of pure N=2 gauge theory. Physically, this can be understood as a statement about line operators in this theory, following ideas of Gaiotto-Moore-Neitzke, Costello, and Kapustin-Saulina – in short, coherent... More >

### Seminar 211, Economic History: “Lifespans of the European Elite, 800-1800”

Seminar | January 30 | 2-3:30 p.m. | 639 Evans Hall

### BLISS Seminar: Network Analysis Problems Motivated by the Smart Grid

Seminar | January 30 | 3-4 p.m. | 400 Cory Hall

Vincent Poor, Princeton University

Electrical Engineering and Computer Sciences (EECS)

Smart grid involves the imposition of an advanced cyber layer atop the physical layer of the electricity grid, in order to improve the efficiency, security and cost of electricity use and distribution, and to allow for greater decentralization of power generation and management. This cyber-physical setting motivates a number of problems in network analysis, and this talk will briefly describe... More >

### Human Brain Imaging with fMRI: The life of a memory: post-encoding reactivation and reorganization of episodic memory

Colloquium | January 30 | 3 p.m. | 5101 Tolman Hall | Canceled

Lila Davachi, PhD, New York University

### Seminar 208, Microeconomics Theory: "Bargaining and Competition in Small Markets"

Seminar | January 30 | 4-6 p.m. | 639 Evans Hall

### Delineating Protein Transportation Processes: Hierarchical Models for Single-Molecule Data

Seminar | January 30 | 4-5 p.m. | 1011 Evans Hall

Yang Chen, Department of Statistics, Harvard University

Single-molecule experiments investigate the kinetics of individual molecules and thus can substantially enhance our understandings of various organisms. Analyzing data from single-molecule experiments poses a number of challenges: (a) the inherent stochasticity of molecules is usually buried in random experimental noise; (b) single-molecule behavior can be highly volatile. For both of these... More >

### Leningrad Underground Poets and the Russian Poetic Tradition: How to Write Yourself Into the Canon

Colloquium | January 30 | 4-6 p.m. | B-4 Dwinelle Hall

Josephine von Zitzewitz, Leverhulme Early Career Fellow, Department of Slavonic Studies, Faculty of Modern & Medieval Languages, University of Cambridge

Institute of Slavic, East European, and Eurasian Studies (ISEEES), Department of Slavic Languages and Literatures

The second lecture in the Spring 2017 Slavic Colloquium series.

### CryoEM structure of Tetrahymena telomerase: insights into functions and interactions of the subunits

Seminar | January 30 | 4-5 p.m. | 106 Stanley Hall

**Jiansen Jiang**, University of California, Los Angeles

### Algebra Seminar: The Eisenbud-Goto Regularity Conjecture

Seminar | January 30 | 4:10-5 p.m. | 939 Evans Hall

Irena Peeva, Cornell

Regularity is a numerical invariant that measures the complexity of the structure of homogeneous ideals in a polynomial ring. Papers of Bayer-Mumford and others give examples of families of ideals attaining doubly exponential regularity. In contrast, Bertram-Ein-Lazarsfeld, Chardin-Ulrich, and Mumford have proven that there are nice bounds on the regularity of the ideals of smooth (or nearly... More >

### Job Market Seminar: "Estimating Hospital Quality with Quasi-experimental Data"

Seminar | January 30 | 4:10-5:30 p.m. | 648 Evans Hall

Field(s): Labor (education, health), Applied econometrics

### Commutative Algebra and Algebraic Geometry: The Eisenbud-Goto Regularity Conjecture

Seminar | January 30 | 4:10-5 p.m. | 939 Evans Hall

Irena Peeva, Cornell University

Regularity is a numerical invariant that measures the complexity of the structure of homogeneous ideals in a polynomial ring. Papers of Bayer-Mumford and others give examples of families of ideals attaining doubly exponential regularity. In contrast, Bertram-Ein-Lazarsfeld, Chardin-Ulrich, and Mumford have proven that there are nice bounds on the regularity of the ideals of smooth (or nearly... More >

### [Physics Colloquium] Solving Big Problems with Small Accelerators: From Colliders to Medical Devices Based on Laser Plasma Accelerators

Seminar | January 30 | 4:15-5 p.m. | LeConte Hall, Lecture Hall 1

Wim Leemans, Director, Accelerator Technology and Applied Physics Division, LBNL

We will discuss the progress on building laser powered, plasma based particle accelerators where electrons surf on waves and can reach energy levels in a few inches that, if one relies on conventional methods, would require machines multiple football fields long. Although many challenges remain, this new technology is at the brink of offering a profoundly different way in which we may build... More >

### A+D Mondays: Gender, Identity, Memoir: Judith Butler and Maggie Nelson in Conversation

Panel Discussion | January 30 | 6:30 p.m. | Berkeley Art Museum and Pacific Film Archive

Berkeley Art Museum and Pacific Film Archive

Judith Butler is Maxine Elliot Professor in the Department of Comparative Literature at UC Berkeley. Her work has been influential in a variety of disciplines including critical theory and gender studies. She has received many of the highest honors in the humanities, including the Andrew W. Mellon Distinguished Achievement Award.

Maggie Nelson, a 2016 MacArthur Fellow, is the author of... More >

Free for BAMPFA members, UC Berkeley students, faculty, staff, retirees; 18 & under + guardian | $10 Non-UC Berkeley students, 65+, disabled persons | $12 General admission Admission for this lecture is free

### MATTERS: Topics in Contemporary Architecture

Panel Discussion | January 30 | 7-8:30 p.m. | 108 Wurster Hall

College of Environmental Design

MONDAY, JAN. 30, 7PM -- A quarterly panel discussion featuring a rotating board of faculty members that focuses on contemporary issues in the field. Dana Buntrock, Neyran Turan, Andrew Atwood and Mark Anderson will discuss The Next Four Years.