UNB

Posted: November 26, 2019 2:00:00 PM AST

Category: Seminars and Colloquia

[Derrick Kirby (UNB) | Thursday, November 28, 2019 at 12:00 PM | Carleton Hall, Room 104] Using linear algebra and basic knowledge of complex numbers, it is possible to find a Fourier series solution to a certain subclass of differential equations that resemble the heat equation (and transport equation), save for the fact that they may be of arbitrary order, given periodic boundary conditions[...]

UNB

Posted: November 5, 2019 10:00:00 AM AST

Category: Seminars and Colloquia

[Md. Ashiqul Haque (UNB) | Tuesday, November 19, 2019 at 11:30 AM | Tilley Hall, Room 404] Survival and longitudinal data arise together, especially from different fields of medical research[...]

UNB

Posted: October 4, 2019 1:00:00 PM ADT

Category: Seminars and Colloquia

[Dr. Hugh Thomas (UQAM) | Monday, October 7, 2019 at 3:00 PM | Tilley Hall, Room 223] The classic approach to scattering amplitudes sums a contribution from a (potentially very large) number of Feynman diagrams[...]

UNB

Posted: September 26, 2019 9:00:00 AM ADT

Category: Seminars and Colloquia

Dr. Don Estep (SFU) | Tuesday, October 1, 2019 at 3:30 PM | Tilley Hall, Room 303 ] The stochastic inverse problem of determining probability structures on input parameters for a physics model corresponding to a given probability structure on the output of the model forms the core of scientific inference and engineering design[...]

UNB

Posted: September 6, 2019 9:00:00 AM ADT

Category: Seminars and Colloquia

Zheng (Frank) Fu (UNB) | Tuesday, September 10, 2019 at 11:30 AM | Tilley Hall, Room 404 ] When we use a statistical model to do prediction, in most occasions, “no surprise” is one criterion[...]

UNB

Posted: August 15, 2019 10:00:00 AM ADT

Category: Seminars and Colloquia

Tianyi Xia (UNB) | Tuesday, August 27, 2019 at 10:30 AM | Tilley Hall, Room 404 ] Finding a strong learner with high prediction accuracy is a hard task in machine learning [...]

UNB

Posted: August 12, 2019 1:00:00 PM ADT

Category: Seminars and Colloquia

Md. Ashiqul Haque (UNB) | Tuesday, August 20, 2019 at 10:30 AM | Tilley Hall, Room 404 ] Prioritizing is a common problem in many situations where the target is to make decision on preferring an item from a set of similar items [...]

UNB

Posted: July 23, 2019 8:00:00 AM ADT

Category: Seminars and Colloquia

The inviscid Burgers' equation is a seemingly simple nonlinear partial differential equation [...]

UNB

Posted: June 25, 2019 3:00:00 PM ADT

Category: Seminars and Colloquia

Md. Ashiqul Haque (UNB) | Wednesday, July 3, 2019 at 10:30 AM | Tilley Hall, Room 404 ] Systematic reviews make attempt to summarise the results from original studies within a given field [...]

UNB

Posted: June 11, 2019 9:00:00 AM ADT

Category: Seminars and Colloquia

Sana Jahedi (UNB) | Thursday, June 13, 2019 at 10:30 AM | Tilley Hall, Room 5 ] Species interactions are important drivers of community structure in eco- logical systems [...]

UNB

Posted: May 10, 2019 2:40:00 PM ADT

Category: Seminars and Colloquia

Jingyu (Sabrina) Cui (UNB) | Tuesday, May 14, 2019 at 10:30 AM | Tilley Hall, Room 404 ] Knowing the reason why something happens is very important [...]

UNB

Posted: May 3, 2019 10:35:00 AM ADT

Category: Seminars and Colloquia

Zheng (Frank) Fu (UNB) | Tuesday, May 3, 2019 at 11:30 AM | Tilley Hall, Room 404 ] In the 20th century, Metropolis algorithm was one of the most influential algorithms for the development and practice of science and engineering [...]

UNB

Posted: April 25, 2019 10:00:00 AM ADT

Category: Seminars and Colloquia

Naghmeh Shahverdi (UNB) | Tuesday, April 30, 2019 at 1:00 PM | Tilley Hall, Room 404 ] Farkas’ lemma is a solvability theorem for a finite system of linear inequalities, first published in 1902 by the Hungarian mathematician Gyula Farkas [...]

UNB

Posted: March 25, 2019 3:00:00 PM ADT

Category: Seminars and Colloquia

Juping Ji (UNB) | Thursday, April 4, 2019 at 3:30 PM | Tilley Hall, Room 5 ] The spruce budworm is a native insect that severely damages forest in Canada, especially, eastern Canada [...]

UNB

Posted: March 12, 2019 8:30:00 AM ADT

Category: Seminars and Colloquia

Dr. Daniel Dutton (Dalhousie University) | Thursday, March 14, 2019 at 3:30 PM | Tilley Hall, Room 224 ] This colloquium will focus on the current practice of statistical analysis in health research using large, publicly available datasets; the Canadian Community Health Survey will be our case study[...]

UNB

Posted: February 26, 2019 10:00:00 AM AST

Category: Seminars and Colloquia

Sana Jahedi (UNB) | Thursday, February 28, 2019 at 2:30 PM | Carleton Hall, Room 106 ] Bifurcation theory is the study of qualitative changes in the structure of dynamical system as parameters vary [...]

UNB

Posted: January 11, 2019 2:40:00 PM AST

Category: Seminars and Colloquia

Jingyu (Sabrina) Cui (UNB) | Thursday, January 17, 2019 at 11:30 AM | Tilley Hall, Room 224 ] The relationship between variables, sometime, cannot be clearly shown in the scatterplot, due to noise or other reasons [...]

UNB

Posted: December 4, 2018 10:00:00 AM AST

Category: Seminars and Colloquia

Alex Snow (UNB) | Thursday, December 6, 2018 at 11:30 AM | Tilley Hall, Room 125 ] Different types of outcomes are frequently collected over time in various studies [...]

UNB

Posted: November 28, 2018 9:00:00 AM AST

Category: Seminars and Colloquia

Elham Ghamari (UNB) | Tuesday, November 29, 2018 at 11:30 AM | Tilley Hall, Room 125 ] Linear algebra and functional analysis typically involve vector spaces over the real numbers or complex numbers [...]

UNB

Posted: November 8, 2018 10:00:00 AM AST

Category: Seminars and Colloquia

Sana Jahedi (UNB) | Tuesday, November 20, 2018 at 11:30 AM | Tilley Hall, Room 205 ] A pulsating traveling front is a solution to a reaction-diffusion-drift equation in a periodic domain with underlying periodic diffusion and velocity field [...]

UNB

Posted: November 8, 2018 10:00:00 AM AST

Category: Seminars and Colloquia

Jacob Morehouse (UNB) | Tuesday, November 13, 2018 at 11:30 AM | Tilley Hall, Room 124 ] The prospect of working with unruly raw data is discomforting for many statisticians and data analysts [...]

UNB

Posted: October 30, 2018 4:00:00 PM ADT

Category: Seminars and Colloquia

Robert Santacruz (UNB) | Thursday, November 15, 2018 at 11:30 AM | Tilley Hall, Room 125 ] Under the influence of external and time-dependent backgrounds, particles can be produced from the quantum vacuum [...]

UNB

Posted: October 25, 2018 12:00:00 AM ADT

Category: Seminars and Colloquia

[Dr. Jon Sensinger (UNB) | Thursday, November 1, 2018 at 3:30 PM | Tilley Hall, Room 304] Engineers often use math to create new solutions to important applications [...]

UNB

Posted: October 16, 2018 12:00:00 AM ADT

Category: Seminars and Colloquia

[Dr. Pervez Hoobhoy (Quaid-I-Azam University) | Tuesday, October 16, 2018 at 1:00 PM | Physics Building, Room 203] Twenty years ago, Maldacena demonstrated the equivalence of string theory in 10-dimensions with a certain quantum field theory in 4-D [...]

UNB

Posted: October 1, 2018 5:00:00 AM ADT

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Posted: September 25, 2018 5:00:00 AM ADT

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Posted: August 24, 2018 5:00:00 AM ADT

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Additional information on this talk can be found here.

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Posted: April 10, 2014 5:00:00 AM ADT

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Honours Thesis Presentations by J.P Simard, "Characteristic codes for nonlinear wave equations" (Supervisor: Sanjeev Seahra) Paul Holloway, "P- adic numbers" (Supervisor: Colin Ingalls) Josh Koncovy, "Elliptic Curves over Finite Fields" (Supervisor: Colin Ingalls) Wednesday, April 16, 2014 at 9:30 am Tilley Hall Room 404 These students and their supervisors welcome you to presentations describing their honours projects (Math 4100). Each presentation will be about half an hour,...

UNB

Posted: April 9, 2014 5:00:00 AM ADT

Category: Seminars and Colloquia

Colloquium Where the truth lies: evaluating the scientific content of multiscale models in the physical sciences and engineering Jeffrey Picka (University of New Brunswick) Tuesday, April 15, 2014 at 3:30 pm Tilley Hall Room 404 When modelling the climate, a flowing powder, or the emergence of unexpected patterns arising from complex chemical reaction dynamics, it is necessary to construct the model on a much smaller scale than the scale of the phenomenon of interest. For the model to...

UNB

Posted: April 4, 2014 5:00:00 AM ADT

Category: Seminars and Colloquia

Science Colloquium 2014: Scientific computation applied to classical and quantum problems Thursday, April 10 at 3:30 p.m., Dineen Auditorium (Head Hall C13) Computer-assisted drug design Dr Ghislain Deslongchamps Department of Chemistry, UNB Fredericton Computers are revolutionizing how drugs are developed in the pharmaceutical industry. Modern molecular modelling in conjunction with new strategies for drug design promises to accelerate the typical 15 year-long development...

UNB

Posted: March 24, 2014 5:00:00 AM ADT

Category: Seminars and Colloquia

Colloquium Quasilinear Systems of PDEs: Hamiltonian structures and integrability Patrick Reynolds (University of New Brunswick) Thursday, April 3, 2014 at 3:30 pm Tilley Hall Room 5 This talk will focus on two questions concerning quasilinear systems of PDEs (also known as systems of hydrodynamic type): under what conditions are they Hamiltonian, and under what conditions are they integrable? We’ll see how such conditions can be formulated in terms of geometric objects on...

UNB

Posted: March 24, 2014 5:00:00 AM ADT

Category: Seminars and Colloquia

Graduate Seminar Latin Squares Larisa Tamjidi (UNB) Thursday, March 27, 2014 at 3:30 pm Tilley Hall Room 5 Latin Squares techniques have been used in many statistical applications. In this talk I introduce the mathematical properties of Latin squares, concept of orthogonally of Latin squares and complete set of mutually orthogonal Latin squares. A Latin square of order n is an n by n matrix containing n distinct symbols, such that each symbol appears in each row and column exactly once. Ms....

UNB

Posted: March 24, 2014 5:00:00 AM ADT

Category: Seminars and Colloquia

Graduate Seminar Quaternion Algebras Amir Nasr Azadani (UNB) Tuesday, March 25, 2014 at 11:30 am Tilley Hall Room 124 My talk is on Quaternion algebras. We give the definition of quaternion and split quaternion algebras, splitting fields and norms of elements. After that conics associated with quaternion algebras will be discussed. Then two classical theorems from the 1930s will be mentioned: a theorem of Witt related to associated conics and a theorem of Albert that determines a criterion...

UNB

Posted: March 18, 2014 5:00:00 AM ADT

Category: Seminars and Colloquia

Doctor of Philosophy Thesis Defense On the Classification of Certain Inductive Limits of Real Circle Algebras and Multiplicativity of Certain Schur Operators Aydin Sarraf (UNB) Thursday, March 20, 2014 at 1:30 pm Harriet Irving Library, Seminar Room 417 (4th floor) This dissertation is divided into two parts. In the first part, I classify simple unital real C*-algebras that are inductive limits of certain real circle algebras. The invariant consists of certain triples of real K-groups and the...

UNB

Posted: March 17, 2014 5:00:00 AM ADT

Category: Seminars and Colloquia

Colloquium Cataland Nathan Williams (Université du Québec à Montréal) Thursday, March 20, 2014 at 3:30 pm Tilley Hall Room 5 I will talk about two combinatorial miracles relating poset-theoretic objects with Coxeter-theoretic objects. The first miracle is that there are the same number of linear extensions of the root poset as reduced words of the longest element (occasionally), while the second is that there are the same number of order ideals in the root poset as certain...

UNB

Posted: March 6, 2014 4:00:00 AM AST

Category: Seminars and Colloquia

ColloquiumQuasilinear Systems of PDEs: Hamiltonian structures and integrability Patrick Reynolds (University of New Brunswick) Thursday, March 13, 2014 at 3:30 pm Tilley Hall Room 5 POSTPONED DUE TO INCLEMENT WEATHER This talk will focus on two questions concerning quasilinear systems of PDEs (also known as systems of hydrodynamic type): under what conditions are they Hamiltonian, and under what conditions are they integrable? We’ll see how such conditions can be formulated in terms of...

UNB

Posted: January 5, 2014 4:00:00 AM AST

Category: Seminars and Colloquia

Doctor of Philosophy Thesis DefenseDynamics of Plant-Herbivore Interaction with Chemical Defense and Spatial Diffusions Fang Yu (UNB) Tuesday, January 7, 2014 at 10:00 am Harriet Irving Library Seminar Room (4th floor) The purpose of this dissertation is to investigate the dynamics of plant-herbivore interactions with plant defense by assuming the numerical response is not necessarily proportional to the functional response. We first introduce basic background on plant chemical defense and...

UNB

Posted: December 28, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

ColloquiumSome results on Nicholson’s blowﬂies equations Yuming Chen (Wilfrid Laurier University) Tuesday, January 7, 2014 at 2:30 pm Tilley Hall Room 309 Data drawn from the comprehensive and elegant experiments performed by Nicholson on laboratory cultures of the sheep blowﬂy are used as illustrative examples of oscillatory population ﬂuctuations in numerous elementary ecology texts. To model this phenomenon, Gurney et al. proposed a model...

UNB

Posted: December 20, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

ColloquiumA Trip to the Tropics Joe Kileel (University of California, Berkeley) Tuesday, January 7, 2014 at 3:30 pm Tilley Hall Room 404 In the middle of winter, this talk will offer a trip to the tropics. Er, at least to tropical mathematics, where algebraic geometry is turned into polyhedral geometry, 1 + 1 = 1, and the picture below is of a smooth curve: By the end of the talk, that should all make sense. Joe Kileel is a Graduate Student in the Department of Mathematics, University...

UNB

Posted: December 13, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Grad Seminar Gelfand-Fuks Cohomology of the Formal Vector Fields Fereshteh Yazdani (UNB) Thursday, December 19, 2013 at 3:30 p.m. Tilley Hall Room 5 In my talk I will speak about the concept of spectral sequence which has a very important role in computing the cohomology and I will define the Gelfand-Fuks cohomology by introducing formal vector fields. Then by using the method of applying spectral sequence I will show the relation between the Gelfand-Fuks cohomology and the cohomology of...

UNB

Posted: December 3, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Colloquium Renormalization Group Approach to Quantum Gravity Gaurav Narain (Institute of Mathematical Sciences, India) Thursday, December 5, 2013 at 12:30 pm Tilley Hall Room 404 In the last century, theoretical physics witnessed two important major revolutions: Quantum Mechanics and General Relativity. First one addresses the physics at small scales while second one explains a large number of phenomenas ranging from astrophysical to cosmological scales. However there are situations...

UNB

Posted: December 3, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Graduate Seminar Bosonic String in the Friedmann-Robertson-Walker Spacetime Shohreh Rahmati (UNB) Thursday, December 5, 2013 at 3:30 pm Tilley Hall Room 5 Bosonic strings are one-dimensional objects that propagate in a two-dimensional manifold embedded in a higher dimensional target space. The evolution of the string depends on the metric of the target space. In this talk, I will talk about the Polyakov action for a bosonic string and its constraints. I will also describe briefly the...

UNB

Posted: December 3, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Graduate Seminar K-Theory for Graph C*-Algebras Christopher Chlebovec (UNB) Friday, December 6, 2013 at 2:30 pm Tilley Hall Room 404 In C*- algebraic K-Theory, one associates to each C*-algebra a pair of abelian groups which contain a great deal of information about the C*-algebra. In my talk, I will discuss the construction of these groups and then focus my attention on computing the K-theory of graph C*-algebras. Christopher...

UNB

Posted: December 2, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Graduate Seminar Dynamics of the Wangersky-Cunningham Predator-Prey Model Xi Hu (UNB) Thursday, November 21, 2013 at 1:30 pm Tilley Hall Room 104 The Wangersky-Cunningham predator-prey model is a two dimensional model which adds a time lag into the Lotka-Volterra predator-prey model. The Wangersky-Cunningham Model assumes that the predator does not immediately convert consumed prey into predator numbers, resulting in a time-lag between prey death and predator growth. In this talk, I will...

UNB

Posted: December 2, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Graduate Seminar Extracting Energy from Black Holes Syed Moeez Hassan (UNB) Thursday, November 28, 2013 at 2:30 pm Tilley Hall Room 5 Einstein’s General Relativity is a theory of gravity that explains our universe on large scales. One of the solutions to Einstein’s equations is the Kerr solution which describes a rotating black hole. Roger Penrose suggested a method of extracting energy from such black holes known as the Penrose mechanism. In this talk, I will give an introduction...

UNB

Posted: November 29, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Colloquium Equivariant Index Theorem and the Van Est Map Xiang Tang (Washington University in St Louis) Thursday, October 31, 2013 at 3:30 pm Tilley Hall Room 5 Let H be a compact subgroup of a Lie group G. When G/H is not compact, G-invariant elliptic operator on G/H in general fails to be Fredholm. In this talk, we will explain an index theorem about such operators using non-commutative geometry. Dr. Xiang Tang is an Associate Professor of Mathematics at Washington University in...

UNB

Posted: November 29, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Colloquium Non-commutative resolutions of singularities and the global spectrum Eleonore Faber (University of Toronto) Wednesday, November 13, 2013 at 2:30 pm Tilley Hall Room 302 This talk is about non-commutative analogs of resolutions of singularities. In short, non-commutative desingularizations of a commutative ring R are endomorphism rings of certain R-modules of finite global dimension. After some motivating examples, we discuss several approaches to non-commutative resolutions...

UNB

Posted: November 29, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Colloquium Vortex Filament Dynamics Walter Craig (McMaster) Thursday, October 10, 2013 at 2:30 pm Tilley Hall Room 125 In this talk I will describe a problem in fluid dynamics concerning the interaction of two near-parallel vortex filaments in three dimensions. This is an example of phase space analysis of a partial differential equation (PDE) that can be formulated as a Hamiltonian dynamical system with infinitely many degrees of freedom. Mathematicians have developed techniques for...

UNB

Posted: November 29, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Colloquium What Happened Before the Big Bang? Martin Bojowald (Penn State) Thursday, November 14, 2013 at 3:30 pm Tilley Hall Room 5 The standard model of cosmology suggests that the universe started with a phase of very high density, described by general relativity as a singularity. Quantum gravity attempts to resolve the singularity by a more fundamental, microscopic theory of space-time. If its equations always remain valid, they could tell us what happened at or even before the big...

UNB

Posted: November 29, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Graduate Seminar Differential Forms in Topology and Geometry Mohammed Alhumaidi (UNB) Thursday, November 7, 2013 at 3:30 pm Tilley Hall Room 5 We give a brief overview of differential forms and their properties, including Stoke’s theorem. The definition of de Rham cohomology is then given. This is followed by the presentation of two applications: the derivation of the Hopf invariant and a proof of the Gauss Bonnet theorem using the method of moving frames. Mohammed...

UNB

Posted: November 29, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Graduate Seminar Graph C*-Algebras Christopher Chlebovec (UNB) Thursday, October 17, 2013 at 3:30 pm Tilley Hall Room 5 Graph C*- algebras are a class of C*- algebras in which we can associate, to each directed graph, a unique C*- algebra. They encompass a large array of examples and allow us to encode the inherent properties of the C*- algebra by analyzing its corresponding graph. In this talk, I will discuss the construction of these C*- algebras as well as its ideal...

UNB

Posted: November 29, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

UNB

Posted: November 25, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

ColloquiumFinding The Hidden Space Behind Complex Networks: An Approach Using The New Theory Of Graph Limits Jeanette Janssen (Dalhousie) Wednesday, October 9, 2013 at 2:30 pm Carleton Hall Room 306 Many real-life networks can be modeled by stochastic processes with a spatial embedding. In such processes, the link probability decreases with distance. The spatial embedding can be seen as a representation of the “hidden reality” about the network. Retrieving the spatial...

UNB

Posted: November 25, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

ColloquiumNoncommutative Rational Singularities Kenneth Chan (University of Washington in Seattle) Thursday, September 12, 2013 at 3:30 pm Tilley Hall Room 125 We introduce the notion of Brauer log pairs and explain their connection with noncommutative algebraic geometry. There is a theory, analogous to the log MMP, which provides terminal models for Brauer log pairs over surfaces. We define the notion of “numerical rationality” for Brauer log pairs, and discuss some of their properties. This...

UNB

Posted: November 25, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

ColloquiumSingular Differential Equations and the Stokes Groupoids Brent Pym (McGill) Thursday, September 5, 2013 at 3:30 pm Tilley Hall Room 125 Solutions of ordinary differential equations typically behave quite badly near an irregular singular point, exhibiting essential singularities and divergent power series expansions. In recent work with Marco Gualtieri and Songhao Li, we use methods from differential and algebraic geometry particularly, the theory of Lie groupoids to construct spaces...

UNB

Posted: November 25, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Graduate SeminarModeling a Biological Invasion by Integrodifference Equation Ali Gharouni (UNB) Thursday, October 3, 2013 at 3:30 pm Tilley Hall Room 224 An integrodifference equation model is one of several types of mathematical models (ODE, PDE, delay, stochastic,…) that are used to study and predict the dynamics of a biological invasion. Integrodifferences incorporate models for the local demography and the dispersal of a population in a discrete time and continuous space. It...

UNB

Posted: November 19, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Masters of Science Oral ExaminationDynamics of a Pathogen-immune Interaction Model Nora Alshobrami (UNB) Wednesday, September 4, 2013 at 2:30 pm Carleton Room 255 A new mathematical model is proposed to describe the interaction between the virus and the immune cells. For this new model, we study the existence of non-negative equilibrium, the bifurcation, the stability of equilibrium. We also carry out numerical simulations to illustrate all possible dynamics. In addition, we numerically...

UNB

Posted: November 18, 2013 4:00:00 AM AST

Category: Seminars and Colloquia

Masters of Science Thesis DefensePrimordial fluctuations from deformed uncertainty relations Andrew Day (UNB) Monday, August 19, 2013 at 2:00 pm Tilley Hall Room 104 We consider the effects of modified uncertainty relations on the generation of primordial perturbations during inflation. Our approach involves high-energy deformations of the commutator algebra between the Fourier-transformed amplitude and momentum of scalar perturbations. We find that a certain class of deformations of the...