New York University Faculty of Arts and Science College of Arts and Science Graduate School of Arts and Science

CIMS Bulletin

Tuesday, September 02, 2014

Geometry Seminar
6:00PM, WWH 1314
Title: Computing Teichmuller maps between polygons.
Mayank Goswami, Max-Planck Institute for Informatics, Saarbruecken.

Friday, September 05, 2014

Applied Mathematics Seminar
2:30PM, WWH 1302
Title: Viruses and geometry – a new perspective on virus assembly and anti-viral therapy
Reidun Twarock, University of York

Saturday, September 06, 2014

Symposium
1:00PM, WWH 101
Title: A Symposium Marking Jean Taylor's 70th Birthday
Various speakers,
Friends and Colleagues of Jean Taylor will gather to celebrate her scientific accomplishments and impact. If you wish to participate, please sign up at
https://www.surveymonkey.com/s/6T3RFDJ

Also note: the Museum of Mathematics will hold a related event later the same day (Sat Sept 6, 8-10:30pm). Besides being an opportunity to recognize Jean Taylor's many contributions, it provides an opportunity to see MoMath's exhibits. For more information and/or to register for the MoMath event, see:
https://in.momath.org/civicrm/event/info?id=234&reset=1

Tuesday, September 09, 2014

BIOMATHEMATICS/COMPUTATIONAL BIOLOGY COLLOQUIUM
12:30PM, WWH 1314
Title: Role of linker histones in the structure and dynamics of chromatin fibers
Antoni Luque, Postdoc, Schlick Lab, Chemistry Department, New York University
Algebraic Geometry Seminar
3:30PM, WWH 201
Title: Kodaira dimension and zeros of holomorphic one-forms
Christian Schnell, Stony Brook University
Geometry Seminar
6:00PM, WWH 1314
Title: Combinatorial discrepancy for boxes via the ellipsoid-infinity norm.
Sasho Nikolov, Rutgers University

Friday, September 12, 2014

Numerical Analysis And Scientific Computing Seminar
10:00AM, WWH 1302
Title: BDDC deluxe domain decomposition algorithms
Olof Widlund, CIMS
Applied Mathematics Seminar
2:30PM, WWH 1302
Title: Optimal Arrangements of Rigid Shapes -- A Voronoi Approach
Lisa Larsson, CIMS

Tuesday, September 16, 2014

Geometry Seminar
6:00AM, WWH
Title: Shallow Packing: Revisiting Housler's Proof
Esther Ezra, CIMS
BIOMATHEMATICS/COMPUTATIONAL BIOLOGY COLLOQUIUM
12:30PM, WWH 1314
Title: TBA
Adriana Compagnoni, Stevens Institute of Technology

Wednesday, September 17, 2014

Atmosphere Ocean Science Colloquium
3:30PM, WWH 1302
Title: Transitions and Tipping Points in the Changing Arctic Cryosphere
Ivan SUDAKOV, Utah
Important elements of the Arctic climate system such as sea ice and permafrost were formed under temperature change resulting in phase transition, primarily between water and ice. Phase transitions in the Arctic cryosphere remain of continuing interest as the climate system warms, and are crucial for the stability of the climate system. Also,such phase transitions lead to changes in shapes of the different patterns in the Arctic Cryosphere. During the Arctic melt season, melt pond (that develops on the surface of sea ice floes) geometry has a complex fractal structure as a result of the fractal dimension transition. I will discuss a standard conceptual energy balance climate model with ice-albedo feedback taking into account the albedo of melt ponds. Different tipping points were obtained for this model. One of them may be quite interesting for climate projections, where the temperature of this system is stabilized (after phase transition) only due to the fractal transition in melt pond geometry. Another important problem, where geometrical changes of the patterns can lead to the tipping points in a climate system, is modeling permafrost lakes. I will discuss the nonlinear phase transition model for permafrost which was used to compute the methane emission generated by lakes in the Arctic. Simulations show that there are two different possible scenarios for methane emission. One of them lead to abrupt temperature change, that is a tipping point in the climate system.

Friday, September 19, 2014

Numerical Analysis And Scientific Computing Seminar
10:00AM, WWH 1302
Title: A level-set based mesh evolution method for shape optimization
Charles Dapogny, Rutgers, New Brunswick
Visiting Members Reception
2:00PM, WWH 13th Floor Lounge
Title: N/A
,
Applied Mathematics Seminar
2:30PM, WWH 1302
Title: TBA
Andrea Bertozzi, UCLA

Tuesday, September 23, 2014

Magneto Fluid Dynamics Seminar
11:00AM, WWH 905
Title: The HiFi multi-fluid modeling framework: Computational fluid modeling of magnetized plasmas in laboratory and space
Vyacheslav Lukin, U.S. Naval Research Laboratory
Geometry Seminar
6:00PM, WWH 1314
Title: A Generalization of the Convex Kakeya Problem.
Hee-Kap Ahn, Pohang, South Korea

Friday, September 26, 2014

Numerical Analysis And Scientific Computing Seminar
10:00AM, WWH 1302
Title: TBA
Qiang Du, Columbia University
Applied Mathematics Seminar
2:30PM, WWH 1302
Title: Mathematics of the Faraday Cage
Nick Trefethan, NYU, Oxford

Tuesday, September 30, 2014

Geometry Seminar
6:00PM, WWH 1314
Title: TBA
Noga Alon, Tel-Aviv University, Tel-Aviv, Israel.

Wednesday, October 01, 2014

Atmosphere Ocean Science Colloquium
3:30PM, WWH 1302
Title: Interaction of atmospheric and oceanic weather
Ivy FRENGER, Princeton
The atmosphere is affected by underlying varying sea surface temperatures. Major variability of sea surface temperatures arises from "the oceanic weather", eddies with scales of the order of 100 km which are omnipresent features in the global ocean. First, we analyzed the impact of these transitory and approximately circular sea surface temperature fronts on the overlying atmosphere by examining the atmospheric conditions associated with over 600,000 individual eddies in the Southern Ocean, using satellite data. We show that ocean eddies locally affect near-surface wind, cloud properties and rainfall, i.e. modulating atmospheric weather conditions. The observed pattern of atmospheric change is consistent with a mechanism in which the sea surface temperature anomalies associated with the oceanic eddies modify turbulence in the atmospheric boundary layer. Second, we set-up a regional coupled atmosphere-ocean model for the south Atlantic. The model reproduces the effect which we detected in observations and confirms our hypothesis regarding the dominant mechanism. Examining the feedback of the eddy-caused wind modifications on the ocean, we find it important to resolve lateral wind gradients at the scales of eddies as they result in a significant energy change of the ocean eddies.

Thursday, October 02, 2014

NYU Poly Mathematics Colloquium
4:35PM, Off-Campus TBA
Title: TBA
Christoph Haberl, Vienna University of Science and Technology

Tuesday, October 07, 2014

BIOMATHEMATICS/COMPUTATIONAL BIOLOGY COLLOQUIUM
12:30PM, WWH 1314
Title: Bayesian phylogenetics with BEAST
Alexander Alekseyenko, NYU School of Medicine
Geometry Seminar
6:00PM, WWH 1314
Title: TBA
Radoslav Fulek, Columbia University, New York

Wednesday, October 08, 2014

Atmosphere Ocean Science Colloquium
3:30PM, WWH 1302
Title: TBD
Themistoklis SAPSIS,

Thursday, October 09, 2014

NYU Poly Mathematics Colloquium
4:35PM, Off-Campus TBA
Title: TBA
Gil Kalai, Yale University & Hebrew University of Jerusalem

Friday, October 10, 2014

Numerical Analysis And Scientific Computing Seminar
10:00AM, WWH 1302
Title: A class of Laplacian multiwavelets bases for high-dimensional data
Nir Sharon, Tel Aviv
Applied Mathematics Seminar
2:30PM, WWH 1302
Title: TBA
Lee Ricketson, CIMS

Thursday, October 16, 2014

NYU Poly Mathematics Colloquium
4:35PM, Off-Campus TBA
Title: TBA
Igor Rivin, Temple University

Tuesday, October 21, 2014

BIOMATHEMATICS/COMPUTATIONAL BIOLOGY COLLOQUIUM
12:30PM, WWH 1314
Title: TBA
Michele Insanally, New York University
Geometry Seminar
6:00PM, WWH 1314
Title: TBA
Chee Yap, Courant Institute, New York University, New York

Wednesday, October 22, 2014

Atmosphere Ocean Science Colloquium
3:30PM, WWH 1302
Title: Thermally coupled modes of climate variability
Amy CLEMENT, University of Miami

Thursday, October 23, 2014

NYU Poly Mathematics Colloquium
4:35PM, Off-Campus TBA
Title: The Set-Indexed Levy Process: Stationarity and Local regularity
Ely Merzbach, Bar-Ilan University

Friday, October 24, 2014

Applied Mathematics Seminar
2:30PM, WWH 1302
Title: TBA
David Ruelle, IHES

Wednesday, October 29, 2014

Atmosphere Ocean Science Colloquium
3:30PM, WWH 1302
Title: Stochastic Models and Statistics for Extreme Precipitation Events
Sam STECHMANN,
In the Tropics, storms and convection occur intermittently and have a major impact on weather and climate. In recent years, tropical rainfall statistics have been shown to conform to paradigms of critical phenomena and statistical physics. To gain further insight into these statistics and extreme events, this talk presents simple stochastic models for the statistics of precipitation events and water vapor dynamics (local in space, and evolving in time). Through exact solutions and simple numerics, a suite of observed rainfall statistics is reproduced by the model, including power-law distributions and long-range correlations. The key ingredients of the model are the dynamics of column water vapor, governed by a combination of Gaussian stochastic forcing and nonlinearity provided via a threshold and/or stochastic trigger. Also explored are the roles of deep convection versus stratiform rainfall, stochastic versus deterministic triggers, and single versus multiple thresholds (with hysteresis). Finally, these statistics are being explored in climate model simulations with collaborators in work in progress.

Tuesday, November 04, 2014

BIOMATHEMATICS/COMPUTATIONAL BIOLOGY COLLOQUIUM
12:30PM, WWH 1314
Title: TBA
Laura Miller, University of North Carolina

Wednesday, November 05, 2014

Atmosphere Ocean Science Colloquium
3:30PM, WWH 1302
Title: TBD
Tiffany SHAW, Columbia

Friday, November 07, 2014

Applied Mathematics Seminar
2:30PM, WWH 1302
Title: TBA
Kyongmin Yeo, IBM Watson Research Center

Tuesday, November 11, 2014

Magneto Fluid Dynamics Seminar
11:00AM, WWH 905
Title: TBA
John Wright, MIT Plasma Science and Fusion Center
BIOMATHEMATICS/COMPUTATIONAL BIOLOGY COLLOQUIUM
12:30PM, WWH 1314
Title: TBA
James Sneyd,

Wednesday, November 12, 2014

Atmosphere Ocean Science Colloquium
3:30PM, WWH 1302
Title: Multiple regimes and thermohaline variability in the quasi-adiabatic pole-to-pole circulation
Christopher WOLFE,
In the limit of weak interior mixing, the ocean can support a pole-to-pole overturning circulation on isopycnals that outcrop in both the Northern Hemisphere and a high-latitude southern circumpolar channel. This overturning cell participates in a salt feedback, which strongly counteracts the precipitation-induced surface freshening of the northern high latitudes and weakly counteracts the surface freshening of the southern high latitudes. The net result is an increase in the range of isopycnals shared between the two hemispheres, which strengthens the overturning circulation. However, if precipitation in the Northern Hemisphere sufficiently exceeds that in the Southern Hemisphere, the overturning cell reverses and its southern endpoint moves equatorward of the channel. The reversed overturning circulation is shallower and weaker than its forward counterpart and is maintained diffusively. In a limited range of parameters, multiple equilibria are found for the same forcing configuration. For weak diapycnal diffusivity, the multiple equilibria are unstable to oscillations around each of the fixed points. The most prominent modes of variability are a decadal oscillation expressed in the Northern subpolar gyre and a multicentennial oscillation spanning both hemisphere. We discuss the dynamics of these oscillations and show how they mediate transitions between the multiple regimes.

Tuesday, November 18, 2014

Magneto Fluid Dynamics Seminar
11:00AM, WWH 905
Title: TBA
Abhay Ram, MIT Plasma Science and Fusion Center
BIOMATHEMATICS/COMPUTATIONAL BIOLOGY COLLOQUIUM
12:30PM, WWH 1314
Title: TBA
Maurizio Porfiri, Polytechnic School of Engineering, NYU
Geometry Seminar
6:00PM, WWH 1314
Title: The Green-Tao Resolution of the Quantitative Sylvester Problem.
Jonathan Lenchner, IBM T.J.Watson Research Center.

Wednesday, November 19, 2014

Atmosphere Ocean Science Colloquium
3:30PM, WWH 1302
Title: Horizontal Convection
Stefan SMITH, UCSD

Friday, November 21, 2014

Applied Mathematics Seminar
2:30PM, WWH 1302
Title: Grain Growth and Grain Growth Stagnation in Metallic Films: The Curious Tail of a Tale and an Ear
Katayun Barmak, Columbia University

Tuesday, November 25, 2014

Geometry Seminar
6:00PM, WWH 1314
Title: Measuring Distances Between Road Networks.
Brittany Therese Fasy, Department of Computer Science, Tulane University

Tuesday, December 09, 2014

Geometry Seminar
6:00PM, WWH 1314
Title: TBA
Joseph Mitchell, Stony Brook University

Friday, December 12, 2014

Holiday Lecture and Party
3:00PM, WWH 109
Title: TBA
,

Wednesday, December 17, 2014

Showcase
5:00PM, WWH 13th floor commons
Title: NYU COMPUTER SCIENCE FALL 2014 SHOWCASE
Various speakers,
Come join the students of the Computer Science department at an event showcasing projects that have been completed in various computer science graduate and undergraduate courses this semester. This is a great opportunity to see the creativity and industry of NYU's CS department.

Thursday, April 23, 2015

Courant Lectures Part 1
3:00PM, WWH 109
Title: TBA
,

Friday, April 24, 2015

Courant Lectures Part 2
10:00AM, WWH 102
Title: TBA
,
Student Prizes Ceremony
2:30PM, WWH 109
Title: N/A
,

Tuesday, May 12, 2015

Showcase
5:00PM, WWH 13th floor commons
Title: NYU COMPUTER SCIENCE SPRING 2015 SHOWCASE
Various speakers,
Come join the students of the Computer Science department at an event showcasing projects that have been completed in various computer science graduate and undergraduate courses this semester. This is a great opportunity to see the creativity and industry of NYU's CS department.

CIMS Bulletin Mailing List

Subscribing electronically to the CIMS Weekly Bulletin is easy:
Go to http://cs.nyu.edu/mailman/listinfo/cimsbulletin where you may subscribe or unsubscribe easily using the web-based GNU Mailman. This process requires a password that you will choose at that time or where one would be then generated for you.

Submitting Events

Announcements for Wednesday's Bulletin should be sent to Jackie Mileski, WWH 1124. Deadline: Tuesday, 4:00 P.M. Any errors in Wednesday's Bulletin should be directed to Jackie Mileski at 998-3022, or email jdm11@cims.nyu.edu.

The alternate coordinator for the Weekly Bulletin is Sylvia Mejia. Her email is mejia@cims.nyu.edu, her office is located in WWH 924, and her telephone is 998-3224.

Please submit all classroom and conference room reservations though the on-line reservation system located at https://cims.nyu.edu/webapps/classrooms/classroom_events/new

Circulation: Please send address changes to Jackie Mileski, CIMS-NYU, 251 Mercer Street, NY, NY 10012-1110, or call (212) 998-3022, or email jdm11@cims.nyu.edu