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 Events
Tue 6 Sep 2016, 9:00am SPECIAL
MATX 1102
Qualifying Exams - Analysis
MATX 1102
Tue 6 Sep 2016, 9:00am-12:00pm

Details

For more information on Qualifying Exams, please visit http://www.math.ubc.ca/Grad/QualifyingExams/index.shtml
Lunch will be provided in  MATX 1101 for students writing the Analysis exam.
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Tue 6 Sep 2016, 1:00pm SPECIAL
MATX 1102
Qualifying Exams - Algebra
MATX 1102
Tue 6 Sep 2016, 1:00pm-4:00pm

Details

For more info, please visit http://www.math.ubc.ca/Grad/QualifyingExams/index.shtml
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Tue 6 Sep 2016, 1:00pm SPECIAL
MATX 1102
Qualifying Exams - Differential Equations
MATX 1102
Tue 6 Sep 2016, 1:00pm-4:00pm

Details

For more info, please visit http://www.math.ubc.ca/Grad/QualifyingExams/index.shtml
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Vitali Vougalter
University of Toronto Mississauga
Tue 6 Sep 2016, 3:30pm
Diff. Geom, Math. Phys., PDE Seminar
ESB 2012
Solvability of some integro-differential equations with anomalous diffusion
ESB 2012
Tue 6 Sep 2016, 3:30pm-4:30pm

Abstract

The work deals with the existence of solutions of an integro-differential equation in the case of the anomalous diffusion with the Laplace operator in a fractional power. The proof of existence
of solutions relies on a fixed point technique. Solvability conditions for elliptic operators without Fredholm property in unbounded domains are used.
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Tue 6 Sep 2016, 4:30pm SPECIAL
Math 125
Department Graduate Orientation
Math 125
Tue 6 Sep 2016, 4:30pm-6:00pm

Details


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University of California, San Diego
Wed 7 Sep 2016, 3:00pm
Probability Seminar
ESB 2012
TBA
ESB 2012
Wed 7 Sep 2016, 3:00pm-4:00pm

Abstract

 TBA
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Georgia Tech
Fri 9 Sep 2016, 3:00pm
Department Colloquium
ESB 2012
TBA
ESB 2012
Fri 9 Sep 2016, 3:00pm-4:00pm

Abstract


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UBC
Tue 13 Sep 2016, 3:30pm
Diff. Geom, Math. Phys., PDE Seminar
EBS 2012
On some functional and geometric inequalities
EBS 2012
Tue 13 Sep 2016, 3:30pm-4:30pm

Abstract

In this talk, we will discuss the Trudinger-Moser and Caffarelli-Kohn-Nirenberg inequalities in the settings where the classical Schwarz rearrangement cannot be used. We will then talk about some approaches to study the maximizers for these problems. This is joint work with Guozhen Lu.

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UCLA
Wed 14 Sep 2016, 3:00pm
Probability Seminar
ESB 2012
Convolution powers of complex-valued functions on $\mathbb{Z}^d$.
ESB 2012
Wed 14 Sep 2016, 3:00pm-4:00pm

Abstract

The study of convolution powers of a finitely supported probability distribution $\phi$ on the $d$-dimensional square lattice is central to random walk theory. For instance, the $n$th convolution power $\phi^{(n)}$ is the distribution
of the $n$th step of the associated random walk and is described by the classical local limit theorem. When such distributions take on complex values, their convolution powers exhibit surprising and disparate behaviors not seen in the probabilistic setting.  In this talk, I will discuss new results concerning the asymptotic behavior of convolution powers of complex-valued functions on $\mathbb{Z}^d$, specifically generalized local limit theorems and sup-norm estimates. This joint work with Laurent Saloff-Coste extends previous results by I. J. Shoenberg, T. N. E. Greville, P. Diaconis and L. Saloff-Coste.
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Stilianos Louca
Mathematics, UBC
Tue 20 Sep 2016, 12:30pm SPECIAL
Room 200, Graduate Student Centre, 6371 Crescent Road, UBC
Doctoral Exam: The ecology of microbial metabolic pathways
Room 200, Graduate Student Centre, 6371 Crescent Road, UBC
Tue 20 Sep 2016, 12:30pm-2:30pm

Details

Abstract:
Microbial metabolic activity drives biogeochemical cycling in virtually every ecosystem. Yet, microbial ecology and its role in ecosystem biochemistry remain poorly understood, partly because the enormous diversity found in microbial communities hinders their modeling. Despite this diversity, the bulk of global biogeochemical fluxes is driven by a few metabolic pathways encoded by a small set of genes, which through time have spread across microbial clades that can replace each other within metabolic niches. Hence, the question arises whether the dynamics of these pathways can be modeled regardless of the hosting organisms, for example based on environmental conditions. Such a pathway-centric paradigm would greatly simplify the modeling of microbial processes at ecosystem scales.
Here I investigate the applicability of a pathway-centric paradigm for microbial ecology. By examining microbial communities in replicate "miniature" aquatic environments, I show that similar ecosystems can exhibit similar metabolic functional community structure, despite highly variable taxonomic composition within individual functional groups. Further, using data from a recent ocean survey I show that environmental conditions strongly explain the distribution of microbial metabolic functional groups across the world's oceans, but only poorly explain the taxonomic composition within individual functional groups. Using statistical tools and mathematical models I conclude that biotic interactions, such as competition and predation, likely underlie much of the taxonomic variation within functional groups observed in the aforementioned studies. The above findings strongly support a pathway-centric paradigm, in which the distribution and activity of microbial metabolic pathways is strongly determined by energetic and stoichiometric constraints, whereas additional mechanisms shape the taxonomic composition within metabolic guilds.

These findings motivated me to explore concrete pathway-centric mathematical models for specific ecosystems. Notably, I constructed a biogeochemical model for Saanich Inlet, a seasonally anoxic fjord with biogeochemistry analogous to oxygen minimum zones. The model describes the dynamics of individual microbial metabolic pathways involved in carbon, nitrogen and sulfur cycling, and largely explains geochemical depth profiles as well as DNA, mRNA and protein sequence data. This work yields insight into ocean biogeochemistry and demonstrates the potential of pathway-centric models for microbial ecology.

Note for Attendees

Latecomers will not be admitted.
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University of Minnesota
Tue 20 Sep 2016, 3:30pm
Diff. Geom, Math. Phys., PDE Seminar
ESB 2012
TBA
ESB 2012
Tue 20 Sep 2016, 3:30pm-10:00am

Abstract


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University of Washington and Tohoku univeristy
Wed 21 Sep 2016, 3:00pm
Probability Seminar
ESB 2012
TBA
ESB 2012
Wed 21 Sep 2016, 3:00pm-4:00pm

Abstract

 TBA
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University of Minnesota
Fri 23 Sep 2016, 3:00pm SPECIAL
Department Colloquium
ESB 2012
PIMS-UBC Distinguished Colloquium--TBA
ESB 2012
Fri 23 Sep 2016, 3:00pm-4:00pm

Abstract


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Seckin Demirbas
UBC
Tue 27 Sep 2016, 3:30pm
Diff. Geom, Math. Phys., PDE Seminar
ESB 2012
TBA
ESB 2012
Tue 27 Sep 2016, 3:30pm-4:20pm

Abstract


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Oregon State University
Wed 28 Sep 2016, 3:00pm
Probability Seminar
ESB 2012
Some probability theory that arises from worrying about Navier-Stokes and other quasilinear equations
ESB 2012
Wed 28 Sep 2016, 3:00pm-4:00pm

Abstract

The success of probability theory in the analysis of linear, or even certain semi-linear,  parabolic and elliptic pde’s 
is well documented.  In spite of various attempts to find a stochastic foothold for the analysis of Navier-Stokes equations and related quasilinear 
equations, the problem remains a substantial challenge.  That said, the quest can lead to new stochastic structures and problems that relate to 
modern probability in fundamental ways.  In this talk I will try to indicate this with a few explicit examples largely stemming from the Lejan-Sznitman
multiplicative cascade/branching random walk  framework for Navier-Stokes equations. 
 
This talk is  primarily based on recent joint work with Radu Dascaliuc, Nicholas Michalowski,  and Enrique Thomann with partial support from
 the National Science Foundation. 
 
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University of Victoria
Thu 29 Sep 2016, 3:30pm SPECIAL
Diff. Geom, Math. Phys., PDE Seminar
TBA
TBA
TBA
Thu 29 Sep 2016, 3:30pm-4:30pm

Abstract


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UBC Math
Fri 30 Sep 2016, 3:00pm
Department Colloquium
ESB 2012
UBC Mathematics and PIMS Faculty Award Colloquium -- TBA
ESB 2012
Fri 30 Sep 2016, 3:00pm-4:00pm

Abstract


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University of California at Irvine
Tue 4 Oct 2016, 3:30pm
Diff. Geom, Math. Phys., PDE Seminar
ESB 2012
TBA
ESB 2012
Tue 4 Oct 2016, 3:30pm-4:30pm

Abstract


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UBC Computer Science and PIMS
Wed 5 Oct 2016, 3:00pm
Probability Seminar
ESB 2012
TBA
ESB 2012
Wed 5 Oct 2016, 3:00pm-4:00pm

Abstract

 TBA
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Laure Saint-Raymond
Harvard University, ENS
Fri 7 Oct 2016, 3:00pm SPECIAL
Department Colloquium
ESB 2012
PIMS-UBC Distinguished Colloquium--TBA
ESB 2012
Fri 7 Oct 2016, 3:00pm-4:00pm

Abstract

 
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UBC Math
Wed 12 Oct 2016, 3:00pm
Probability Seminar
ESB 2012
TBA
ESB 2012
Wed 12 Oct 2016, 3:00pm-4:00pm

Abstract

 
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Frank Sotille
TAMU
Thu 13 Oct 2016, 4:00pm
Discrete Math Seminar
Math 126
Math 126
Thu 13 Oct 2016, 4:00pm-5:00am

Abstract


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UBC Math
Fri 14 Oct 2016, 3:00pm
Department Colloquium
Math Annex 1100
TBA
Math Annex 1100
Fri 14 Oct 2016, 3:00pm-4:00pm

Abstract


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University of Washington
Wed 19 Oct 2016, 3:00pm
Probability Seminar
ESB 2012
TBA
ESB 2012
Wed 19 Oct 2016, 3:00pm-4:00pm

Abstract

 TBA
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UBC Math
Fri 21 Oct 2016, 3:00pm
Department Colloquium
Math Annex 1100
TBA
Math Annex 1100
Fri 21 Oct 2016, 3:00pm-4:00pm

Abstract


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University of Cambridge
Wed 26 Oct 2016, 3:00pm
Probability Seminar
ESB 2012
TBA
ESB 2012
Wed 26 Oct 2016, 3:00pm-4:00pm

Abstract

 TBA
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McGill University
Fri 28 Oct 2016, 3:00pm
Department Colloquium
ESB 2012
CRM-Fields-PIMS Award Lecture: TBA
ESB 2012
Fri 28 Oct 2016, 3:00pm-4:00pm

Abstract


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Princeton University
Fri 4 Nov 2016, 3:00pm SPECIAL
Department Colloquium
ESB 2012
PIMS-UBC Distinguished Colloquium--TBA
ESB 2012
Fri 4 Nov 2016, 3:00pm-4:00pm

Abstract

 
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TBA
Wed 9 Nov 2016, 3:00pm
Probability Seminar
ESB 2012
ESB 2012
Wed 9 Nov 2016, 3:00pm-4:00pm

Abstract

 TBA
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Massachusetts Institute of Technology
Wed 16 Nov 2016, 3:00pm
Probability Seminar
ESB 2012
TBA
ESB 2012
Wed 16 Nov 2016, 3:00pm-4:00pm

Abstract

 TBA
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Victor Lie
Purdue University
Mon 21 Nov 2016, 3:00pm
Harmonic Analysis Seminar
Mon 21 Nov 2016, 3:00pm-4:00pm

Abstract

 
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Emory University
Fri 25 Nov 2016, 3:00pm SPECIAL
Department Colloquium
ESB 2012
TBA--PIMS-UBC Distinguished Colloquium
ESB 2012
Fri 25 Nov 2016, 3:00pm-4:00pm

Abstract

 
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UBC Math
Wed 30 Nov 2016, 3:00pm
Probability Seminar
ESB 2012
TBA
ESB 2012
Wed 30 Nov 2016, 3:00pm-4:00pm

Abstract

 TBA
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University of Grenoble
Fri 10 Mar 2017, 3:00pm SPECIAL
Department Colloquium
ESB 2012
TBA
ESB 2012
Fri 10 Mar 2017, 3:00pm-4:00pm

Abstract

PIMS-UBC Distinguished Colloquium TBA
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University of Grenoble
Mon 13 Mar 2017, 3:00pm
Algebraic Geometry Seminar
MATH 126
TBA
MATH 126
Mon 13 Mar 2017, 3:00pm-4:00pm
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