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A live feed of seminars and special events in the upcoming week.
- April 1st, 2013 (03:35pm - 04:35pm)
- Seminar: Center for Dynamics and Geometry Seminars
Title: Fiber-bunched cocycles: cohomology and periodic data.
Speaker: Victoria Sadovskaya, Penn State
Location: MB114
We consider Holder continuous fiber-bunched GL(d,R)-valued cocycles over a hyperbolic diffeomorphism. We show that if two cocycles have equal periodic data, then they are Holder continuously cohomologous. We obtain similar conclusions under weaker assumptions on the periodic data. We apply these results to the question when a hyperbolic toral automorphism is smoothly conjugate to a C^1-small perturbation.
- April 2nd, 2013 (02:30pm - 03:30pm)
- Seminar: GAP Seminar
Title: Geometry and tensor networks
Speaker: Jason Morton, Penn State
Location: MB106
Tensor networks -- or more generally, diagrams in monoidal categories with various additional properties -- arise constantly in applications, particularly those involving networks used to process information in some way. Aided by the easy interpretation of the graphical language, they have played an important role in computer science, statistics and machine learning, and quantum information and many-body systems. Tools from algebraic geometry, representation theory, and category theory have recently been applied to problems arising from such networks. Basic questions about each type of information-processing system, such as what probability distributions or quantum states can be represented, turn out to lead to interesting problems in algebraic geometry, representation theory, and category theory.
- April 2nd, 2013 (02:30pm - 03:45pm)
- Seminar: Logic Seminar
Title: Implicit definability in arithmetic, part 3.
Speaker: Stephen G. Simpson, Pennsylvania State University
Location: MB315
In this talk I present a new proof of Harrington's theorems concerning implicit definability over the integers. Unlike previous proofs, the new proof is easy and does not involve priority arguments. The theorems read as follows. (1) There exist two sets of integers, each of which is implictly definable yet neither of which is explicitly definable from the other. (2) There exists a set of integers which belongs to an implicitly definable countable set of sets but is not by itself implicitly definable.
- April 2nd, 2013 (03:30pm - 06:00pm)
- Seminar: Working Seminar: Dynamics and its Working Tools
Title: Algebraic K-theory and its applications to dynamics, III
Speaker: Kurt Vinhage, Penn State
Location: MB216
- April 2nd, 2013 (03:30pm - 04:30pm)
- Seminar: CCMA PDEs and Numerical Methods Seminar Series
Title: Cascadic Multilevel Algorithms for Saddle Point Systems
Speaker: Constantin Bacuta, Department of Mathematical Sciences , University of Delaware
Location: MB114
Based on the cascade principle, we consider multilevel type of algorithms for discretizing saddle point problems. The finite element spaces are associated with successively finer and finer grids. On each fixed level a standard Uzawa, gradient Uzawa, or conjugate gradient Uzawa method is implemented. The algorithms are designed to perform more iterations on the coarse grids and fewer on the fine grids. The level change criteria is based on keeping the iteration error close to expected discretization error. To decrease the running time, the iteration on each new level starts with the best approximation from the previous level. Numerical results supporting the efficiency of the algorithms are presented for the Stokes system. We use our general theory to introduce/review the ``saddle point least-squares'' method and relate it with the Bramble-Pasciak's least square approach. As a consequence, we design a least-squares iterative solver for the time harmonic Maxwell equations. This is joint work with Francisco Sayas, and Lu Shu.
- April 2nd, 2013 (05:00pm - 06:30pm)
- Seminar: SIAM Student Chapter Seminar
Title: Tensor Product and its Applications in Physical Algorithms
Speaker: Yufei Shen, Pennsylvania State University
Location: MB106
Quantum theory, in essence, is solving a differential equation called Schrödinger's Equation. For a strongly correlated system, this differential equation is notoriously hard to solve since the eigen-space becomes too big even for supercomputers. One method to solve it numerically is called Time Evolving Block Decimation (TEBD), which use Matrix Product State (MPS) to represent the space of eigenvectors. This method, by embracing quantum entanglement in the approximation, only keeps those eigenstates which are physically significant, thus greatly reduces computational cost. I will also show some results of this method by solving the Bose-Hubbard Hamiltonian.
- April 3rd, 2013 (03:35pm - 04:35pm)
- Seminar: Center for Dynamics and Geometry Seminars
Title: Growth estimates for orbits of self-adjoint groups
Speaker: Pat Eberlein, UNC
Location: MB114
Let G denote a closed, connected, noncompact subgroup of GL(n,R) that is self-adjoint (invariant under the transpose operation). Let d_{R} denote the right invariant Riemannian distance function defined by the Euclidean inner product on M(n,R). We study a kind of metric entropy for group actions in which the real numbers R are replaced by a Lie group G and Diff(R^{n}) is replaced by GL(n,R). More specifically, for a fixed vector v in R^{n} we obtained algebraically defined upper and lower bounds L^{-}(v) and L^{+}(v) for the asymptotic growth rate of the function g → log |g(v)|/d_{R}(g,G_{v}) as d_{R}(g, G_{v}) → \infty, where G_{v} denotes the subgroup of G that fixes v. If G_{v} is compact, then we may replace d_{R}(g, G_{v}) by d_{R}(g,Id) in the result above. We compute L^{-}(v) and L^{+}(v) for the irreducible, real, linear representations of G = SL(2,R). If the dimension of the G-module V is odd, then L^{_}(v) = L^{+}(v) for all v in a nonempty open subset O of V. In particular, the function g → log |g(v)|/d_{R}(g,G_{v}) has a limit for vectors v in O as d_{R}(g, G_{v}) → \infty. These examples show that the functions L^{-}(v) and L^{+}(v) are SO(2,R)-invariant but not SL(2,R) invariant.
- April 3rd, 2013 (04:40pm - 05:30pm)
- Seminar: Applied Algebra and Network Theory Seminar
Title: Polyhedral combinatorics of conformal blocks and fusion algebras
Speaker: Chris Manon, U.C. Berkeley
Location: MB106
Abstract: http://math.berkeley.edu/~manonc/Research.html
For a simple complex Lie algebra $\mathfrak{g}$ and a non-negative integer $L$, the fusion algebra or Verlinde algebra $\mathcal{F}_L(\mathfrak{g})$ is an elegant finite dimensional algebra which encodes the dimensions of the spaces of partition functions for the Wess-Zumino-Witten model of conformal field theory. When $\mathfrak{g} = sl_m(\\mathbb{C})$, this algebra also makes an appearance as the small quantum cohomology ring of the Grassmannian variety $Gr_m(\mathbb{C}^{m+L}).$ We will describe what we have been calling a polyhedral presentation of this algebra for $sl_2(\mathbb{C})$ and $sl_3(\mathbb{C})$, and how such a presentation is given by combinatorics related to moduli spaces of vector bundles of rank $2$ and rank $3$. We will further explain how such a presentation for $sl_m(\mathbb{C})$ with $m > 3$ would be related to questions about moduli of higher rank vector bundles. Time permitting, we will also give some remarks on how these constructions are related to phylogenetics.
- April 4th, 2013 (10:00am - 10:50am)
- Seminar: Hyperbolic and Mixed Type PDEs Seminar
Title: Existence and Stability of Traveling Waves for an Integro-differential Equation for Slow Erosion
Speaker: Wen Shen, Penn State
Location: MB216
We study an integro-differential equation that describes the slow erosion of granular flow. The equation is a first order non-linear conservation law where the flux function includes an integral term. We show that there exist unique traveling wave solutions that connect profiles with equilibrium slope at $\pm\infty$. Such traveling waves take very different forms from those in standard conservation laws. Furthermore, we prove that the traveling wave profiles are locally stable, i.e., solutions with monotone initial data approaches the traveling waves asymptotically as $t\to+\infty$.
- April 4th, 2013 (11:15am - 12:05pm)
- Seminar: Algebra and Number Theory Seminar
Title: Small Height and Infinite Non-abelian Extensions
Speaker: Philipp Habegger, IAS, Princeton
Location: MB106
The absolute, logarithmic Weil height is non-negative and vanishes precisely at 0 and at the roots of unity. Moreover, when restricted to a number field there are no arbitrarily small, positive heights. Amoroso, Bombieri, David, Dvornicich, Schinzel, Zannier and others exhibited many infinite extensions of the rationals with a height gap. For example, the maximal abelian extension of any number field has this property. To see a non-abelian example, let E be an elliptic curve defined over the rationals without complex multiplication. The field K generated by all complex points of E with finite order is an infinite extension of the rationals. Its Galois group contains no commutative subgroup of finite index. In the talk, I will sketch a proof that K contains no elements of sufficiently small, positive height.
- April 4th, 2013 (02:30pm - 03:30pm)
- Seminar: Noncommutative Geometry Seminar
Title: Ghostbusting and property A
Speaker: John Roe, Penn State
Location: MB106
I'll talk about recent work with Rufus Willett about "ghosts" in the Roe algebra, which gives a necessary and sufficient condition for the existence of (non-compact) ghosts.
- April 4th, 2013 (03:35pm - 04:25pm)
- Seminar: Department of Mathematics Colloquium
Title: Symplectic geometry of the moduli of ordinary differential equations
Speaker: Leon Takhtajan, Stony Brook University
Location: MB114
I will review old and new results on the symplectic structure of 2nd order ordinary differential equations, its connection to quasi-fuchsian deformation spaces and Weil-Petersson geometry of moduli spaces. If time permits, I will explain the relation with the so-called conformal blocks of quantum Liouville theory.
- April 5th, 2013 (12:20pm - 01:30pm)
- Seminar: CCMA Luncheon Seminar
Title: Introduction to the regularity problem for the 3D Navier-Stokes and related equations
Speaker: Alexey Cheskidov, University of Illinois at Chicago
Location: MB114
I will give a brief introduction to the regularity problem for the 3D Navier-Stokes equations and simpler models, such as the dyadic equations. Its relation to Onsager's conjecture will also be discussed.
- April 5th, 2013 (03:35pm - 04:25pm)
- Seminar: Computational and Applied Mathematics Colloquium
Title: On the regularity of the 3D Navier-Stokes equations in the largest critical space
Speaker: Alexey Cheskidov, University of Illinois at Chicago
Location: MB106
In this talk I will discuss various well-posedeness and ill-posedness results for the 3D Navier-Stokes equations in the largest critical space. In particular, I will describe a recent norm inflation result for a hyperdissipative Navier-Stokes equations that occurs in critical and supercritical spaces even in the case where the global regularity is known. We will see how a new scaling arises that prevents us from proving a small initial data result in the largest critical space.
- April 8th, 2013 (03:30pm - 05:00pm)
- Seminar: CCMA PDEs and Numerical Methods Seminar Series
Title: Uniqueness questions for the Navier-Stokes equation in the hyperbolic setting
Speaker: Magdalena Czubak, SUNY, Binghamton
Location: MB106
The solutions to the Navier-Stokes equation are unique in two dimensions in the Euclidean space. In this talk, we will consider the Navier-Stokes equation on two dimensional negatively curved manifolds and construct a family of non-unique solutions. The solutions we obtain have finite energy and dissipation and satisfy the global energy inequality. Then we will discuss possible ways to formulate the problem so the uniqueness can be restored. This is joint work with Chi Hin Chan.
- April 8th, 2013 (03:35pm - 04:35pm)
- Seminar: Center for Dynamics and Geometry Seminars
Title: The deterministic random walk
Speaker: Omri Sarig, The Weizmann Institute for Science
Location: MB114
The simple random walk on Z can be simulated by picking randomly uniformly in the unit interval, iterating T(x)=2x mod 1, and moving the "walker" one step to the right every time the orbit lands at [0,1/2) and one step to the left every time the orbit lands at [1/2,1). What happens if we replace the chaotic T(x)=2x mod 1 by the zero entropy R(x)=x+\alpha mod 1 for \alpha irrational? The resulting process, called the "deterministic random walk", is again a recurrent zero drift walk -- but one that visits zero much more often. This is a joint work with Avila, Dolgopyat, and Duriev
- April 9th, 2013 (09:00am - 11:00am)
- Seminar: Ph.D. Oral Comprehensive Examination
Title: "Numerical simulation of solar cells"
Speaker: Yicong Ma, Adviser: Jinchao Xu, Penn State
Location: 319 HHD-East
Abstract: http://
Solar energy plays an important role nowadays and can make considerable contributions to solving some of the most urgent problems the world now faces. Its efficiency is usually measured by the so-called power conversion efficiency, which mainly depends on the nano-structure of unit solar cell. Instead of time-consuming and expensive experiments, numerical simulation plays a crucial role in designing unit solar cell to improve the power conversion efficiency with much lower costs. In the simulation of solar cells, we need to solve Maxwell equation with complex and jump coefficients, and the resulting linear systems are highly indefinite and challenging. In this talk, I will introduce the basic physical model of the optical process of the unit solar cell. We use finite element method to discrete the model problem and use efficient linear solvers based on Hiptmair-Xu preconditioner to solve the linear system from finite element discretization. Preliminary test results will be presented.
- April 9th, 2013 (11:15am - 12:05pm)
- Seminar: Combinatorics/Partitions Seminar
Title: Moments of Askey-Wilson polynomials
Speaker: Jang Soo Kim, University of Minnesota
Location: MB106
The Askey-Wilson polynomials are the most general orthogonal polynomials among those classified by the Askey scheme. These are orthogonal polynomials in one variable with 5 parameters. In this talk I will talk about 3 combinatorial methods to study the nth moment of the Askey-Wilson polynomials. The first method is Viennot's theory of weighted Motzkin paths. The second method uses staircase tableaux introduced by Corteel and Williams. The third method is a modification of an idea of Ismail, Stanton, and Viennot on matchings and q-Hermite polynomials. Using the third method we express the nth moment as a fraction of two generating functions for certain matchings and obtain a new formula for the moment. This is joint work with Dennis Stanton.
- April 9th, 2013 (02:30pm - 03:30pm)
- Seminar: GAP Seminar
Title: Gamma factors and normalising distributions I
Speaker: Pierre Clare, Penn State University
Location: MB106
We will present some classical features of L-functions and gamma-factors in relation with the representation theory of reductive groups. Our goal will be to describe some strong similarities observed between the convolution picture for gamma-factors of Braverman and Kazhdan and normalising distributions for C*-algebraic universal principal series.
- April 9th, 2013 (02:30pm - 03:45pm)
- Seminar: Logic Seminar
Title: The random graph and its properties.
Speaker: John Pardo, Pennsylvania State University
Location: MB315
In graph theory, the probabilistic method of constructing countable graphs with randomly determined edges has been used to prove significant results where traditional methods have failed. Interestingly, these sorts of graphs have also appeared in other areas of mathematics using deterministic means, in particular in logic as the Fraisse limit of a certain class of graphs, and have been found to have some very fascinating properties. In my talk I will explain both the probabilistic and deterministic constructions as well as some of those fascinating properties, in the process showing that the random graph may not be as random as it first appears.
- April 9th, 2013 (03:30pm - 06:00pm)
- Seminar: Working Seminar: Dynamics and its Working Tools
Title: Transfer Operator method, I
Speaker: Omri Sarig, Weizmann Institute of Science, Rehovot, Israel
Location: MB216
Suppose T is a non invertible expanding map preserving a measure m. The action of T on the points of the space induces an action on the space of "mass densities" f dm. This action is called the transfer operator, and it can be viewed as an operator on L^1 (the space of integrable signed densities f). As it turns out, the more chaotic the behavior of T, the better is the behavior of the transfer operator. This observation is the starting point for a collection of methods for analyzing the ergodic and stochastic properties of m by a studying the operator theoretic properties of the transfer operator. We will develop the basic theory and explore some of the applications, such as decay of correlations and (time permitting) the central limit theorem.
- April 10th, 2013 (03:35pm - 04:35pm)
- Seminar: Center for Dynamics and Geometry Seminars
Title: TBA
Speaker: Bruce Kleiner, NYU
Location: MB114
- April 11th, 2013 (11:15am - 12:05pm)
- Seminar: Algebra and Number Theory Seminar
Title: The distribution of the variance of primes in arithmetic progressions
Speaker: Daniel Fiorilli, University of Michigan
Location: MB106
Gallagher's refinement of the Barban-Davenport-Halberstam states that V(x;q), the variance of primes up to x in the arithmetic progressions modulo q, is at most x log q, on average over q in the range x/(log x)^A < q < x. It was then discovered by Montgomery that in this range V(x;q) is actually asymptotic to x log q (on average over q); his result was refined by a long list of authors including Hooley, Goldston and Vaughan, and Friedlander and Goldston. Tools used in these papers include the circle method and divisor switching techniques, and under GRH and a strong from of the Hardy-Littlewood Conjecture it is now known that V(x;q) is asymptotic to x log q in the range x^{1/2+o(1)} < q< x. While it is not clear that the asymptotic should hold for more moderate values of q, Keating and Rudnick have proven an estimate for the function field analogue of V(x;q) which suggests that this range could be extended to x^{o(1)} < q< x. In this talk we will show how one can use probabilistic techniques to give evidence that V(x;q) should be asymptotic to x log q in the even wider range (log log x)^{1+o(1)} < q < x, and that this range is best possible.
- April 11th, 2013 (01:25pm - 02:15pm)
- Seminar: Algebra and Number Theory Seminar
Title: The distribution of the variance of primes in arithmetic progressions
Speaker: Daniel Fiorilli, University of Michigan
Location: MB114
Abstract: http://
Gallagher's refinement of the Barban-Davenport-Halberstam states that V(x;q), the variance of primes up to x in the arithmetic progressions modulo q, is at most x log q, on average over q in the range x/(log x)^A < q < x. It was then discovered by Montgomery that in this range V(x;q) is actually asymptotic to x log q (on average over q); his result was refined by a long list of authors including Hooley, Goldston and Vaughan, and Friedlander and Goldston. Tools used in these papers include the circle method and divisor switching techniques, and under GRH and a strong from of the Hardy-Littlewood Conjecture it is now known that V(x;q) is asymptotic to x log q in the range x^{1/2+o(1)} < q< x. While it is not clear that the asymptotic should hold for more moderate values of q, Keating and Rudnick have proven an estimate for the function field analogue of V(x;q) which suggests that this range could be extended to x^{o(1)} < q< x. In this talk we will show how one can use probabilistic techniques to give evidence that V(x;q) should be asymptotic to x log q in the even wider range (log log x)^{1+o(1)} < q < x, and that this range is best possible.
- April 11th, 2013 (02:30pm - 03:30pm)
- Seminar: Noncommutative Geometry Seminar
Title: Gamma factors and normalising distributions II
Speaker: Pierre Clare, Penn State University
Location: MB106
We will present some classical features of L-functions and gamma-factors in relation with the representation theory of reductive groups. Our goal will be to describe some strong similarities observed between the convolution picture for gamma-factors of Braverman and Kazhdan and normalising distributions for C*-algebraic universal principal series.
- April 12th, 2013 (12:20pm - 01:30pm)
- Seminar: CCMA Luncheon Seminar
Title: Some puzzles about Couette flow
Speaker: Zhiwu Lin, Georgia Tech Mathematics
Location: MB114
Couette flows are shear flows with a linear velocity profile between two plates. It is one of the simplest but important laminar flows. We will discuss two unresolved issues about them. First, Couette flows are known to be linearly stable for any Reynolds number, but become turbulent for large Reynolds numbers by both experimental and numerical results. We will discuss several attemps to explain the nature of transient turbulence near Couette. Second, starting from the work of Orr in 1907, the velocity of the linearized inviscid equation at Couette flows is known to decay in time. But the nonlinear inviscid damping is still open. The mechanism of such inviscid damping is important to understand the appearance of coherent structures in 2D turbulence.
- April 12th, 2013 (02:20pm - 03:20pm)
- Seminar: Seminar on Probability and its Application
Title: Almost sure central limit theorems
Speaker: Lucia Tabacu, PSU
Location: MB106
We give an overview of the almost sure central limit theorems and show their connection to the classical central limit theorems. We also introduce a new result, the almost sure central limit theorem for linear rank statistics.
- April 12th, 2013 (03:35pm - 04:25pm)
- Seminar: Computational and Applied Mathematics Colloquium
Title: Nonlinear Landau damping
Speaker: Zhiwu Lin, Georgia Tech Mathematics
Location: MB106
Consider electrostatic plasmas described by Vlasov-Poisson equation with a fixed ion background. In 1946, Landau discovered the linear decay of electric field near a stable homogeneous state. The nonlinear Landau damping was recently proved under analytic perturbations by Mouhot and Villani, but for general perturbations the problem is still largely open. With Chongchun Zeng, we construct nontrivial traveling waves (BGK waves) with any spatial period which are arbitrarily near any homogeneous state in H^s (s<3/2) Sobolev norm of the distribution function. Therefore, the nonlinear Landau damping is not true in H^s (s<3/2) spaces. We also showed that in small H^s (s>3/2) neighborhoods of linearly stable homogeneous states, there exist no nontrivial invariant structures. Our results suggest that for subcritical perturbations (s<3/2) the nonlinear trapping effect cannnot be ignored even in the limit of small amplitude; for supercritical perturbations (s>3/2), such trapping effect might have no influence on the long time dynamics and the nonlinear damping is hopeful. Similar results were also obtained for the problem of nonlinear inviscid damping of Couette flow, for which the linear decay was first observed by Orr in 1907.
- April 15th, 2013 (03:35pm - 04:35pm)
- Seminar: Center for Dynamics and Geometry Seminars
Title: Invisibility and retro-reflection in billiards
Speaker: Alexandre Plakhov, University of Aveiro, Portugal and Institute for Information Transmission Problems, Russia
Location: MB114
We consider the problem of invisibility for bodies with mirror surface within the scope of geometrical optics. The problem amounts to studying billiards in the exterior of bounded regions. Examples of bodies invisible in 1, 2, and 3 directions and bodies invisible from 1 and 2 points are provided in the talk. It is proved that there do not exist bodies invisible in all directions. The question of maximum number of directions and/or points of invisibility of a body remains open. The duality between invisibility (unperturbed billiard trajectories outside a bounded domain) and periodic billiard trajectories inside the domain is also discussed. Further, we consider retro-reflecting bodies with mirror surface. A body is called a perfect retroreflector, if the direction of any beam of light incident on it is changed to the opposite. We provide several examples of asymptotically retro-reflecting sequences of bodies. On the other hand, it is not known if there exist perfect billiard retroreflectors.
- April 16th, 2013 (09:00am - 11:00am)
- Seminar: Ph.D. Oral Comprehensive Examination
Title: "Aggregation based AMG on weighted Graph Laplacian problems"
Speaker: Fei Cao, Adviser: James Brannick, Penn State
Location: 23 McAllister Building
It has been known that graph laplacian problem plays an important role in large-scale computational applications such as semi-supervised machine learning, spectral clustering of images, genetic data and web pages, transportation network flows, and electrical resistor circuits. While algebraic multigrid method (AMG) is well-known as "black box" solver method. In this talk we propose to discuss variants of algebraic multigrid for solving (weighted) graph Laplacian problems defined on general graphs. The multigrid solvers we intend to develop are aggregation-based methods that will be designed to use the geometry from the problem at hand to select the coarse variables (whenever such information is available, e.g., when finite element, finite volume, and finite difference discretizations of 2d and 3d anisotropic diffusion problems are considered) and, then, use algebraic techniques to construct the corresponding interpolation operators.
- April 16th, 2013 (11:00am - 01:00pm)
- Seminar: Ph.D. Thesis Defense
Title: "Optimal Pricing Strategies in a Limit Order Book"
Speaker: Giancarlo Facchi, Adviser: Alberto Bressan, Penn State
Location: 011 Ag Science Industries
Abstract: http://
We study a continuum model of the limit order book, viewed as a noncooperative game for n players. An external buyer asks for a random amount X > 0 of a given asset. This amount will be bought at the lowest available price, as long as the price does not exceed a given upper bound P . One or more sellers offer various quantities of the asset at different prices, competing to fulfill the incoming order, whose size is not known a priori. Depending on the probability distribution of X , we prove the existence (or non-existence) of a unique Nash equilibrium. In the positive case, the optimal pricing strategies of the various agents are explicitly determined.
- April 16th, 2013 (11:15am - 12:05pm)
- Seminar: Combinatorics/Partitions Seminar
Title: A periodic approach to plane partition congruences
Speaker: Matt Mizuhara, PSU
Location: MB106
Ramanujan's celebrated congruences of the partition function p(n) have inspired a vast amount of results on various unrestricted and restricted partition functions. In 1989 Kwong characterized several cases of periodicity of rational polynomial functions modulo prime powers. These results yield an alternative approach to prove known congruences on restricted plane partitions as well as prove a new congruence.
- April 16th, 2013 (02:30pm - 03:30pm)
- Seminar: GAP Seminar
Title: Hermitian Variations of Hodge Structure of Calabi-Yau type
Speaker: Radu Laza, Stony Brook University
Location: MB106
Except a few special cases (e.g. abelian varieties and K3 surfaces), the images of period maps for families of algebraic varieties satisfy non-trivial Griffiths' transversality relations. It is of interest to understand these images of period maps, especially for Calabi-Yau threefolds. In this talk, I will discuss the case when the images of period maps can be described algebraically. Specifically, I will show that if a horizontal subvariety Z of a period domain D is semi-algebraic and it is stabilized by a large discrete group, then Z is automatically a Hermitian symmetric domain with a totally geodesic embedding into the period domain D. I will then discuss the classification of the semi-algebraic cases for variations of Hodge structures of Calabi-Yau type, with a special emphasis on the classification over Q (which is partially based on earlier work of Zarhin). This is joint work with R. Friedman.
- April 16th, 2013 (02:30pm - 03:45pm)
- Seminar: Logic Seminar
Title: The logic of graph decompositions.
Speaker: Stephen Flood, Pennsylvania State University
Location: MB315
The theory of simplicial graph decompositions studies the infinite graphs that can be built using a sequence of irreducible graphs which are attached together at complete subgraphs. We study the logical strength required to prove the area's "existence theorems," which say that certain classes of graphs admit such a decomposition. We will discuss the strength of these existence theorems from the perspective of reverse mathematics and computability theory. In addition, we will give upper and lower bounds on the possible ordinal lengths of prime decompositions.
- April 16th, 2013 (03:30pm - 06:00pm)
- Seminar: Working Seminar: Dynamics and its Working Tools
Title: Transfer Operator method, II
Speaker: Omri Sarig, Weizmann Institute of Science, Rehovot, Israel
Location: MB216
Suppose T is a non invertible expanding map preserving a measure m. The action of T on the points of the space induces an action on the space of "mass densities" f dm. This action is called the transfer operator, and it can be viewed as an operator on L^1 (the space of integrable signed densities f). As it turns out, the more chaotic the behavior of T, the better is the behavior of the transfer operator. This observation is the starting point for a collection of methods for analyzing the ergodic and stochastic properties of m by a studying the operator theoretic properties of the transfer operator. We will develop the basic theory and explore some of the applications, such as decay of correlations and (time permitting) the central limit theorem.
- April 16th, 2013 (04:00pm - 05:15pm)
- Title: Private
Location: MB106
- April 17th, 2013 (03:35pm - 04:35pm)
- Seminar: Center for Dynamics and Geometry Seminars
Title: Problems of optimal resistance in Newtonian aerodynamics
Speaker: Alexandre Plakhov, University of Aveiro, Portugal and Institute for Information Transmission Problems, Russia
Location: MB114
A rigid body moves in a rarefied medium of resting particles and at the same time very slowly rotates (somersaults). Each particle of the medium is reflected elastically when hitting the body boundary (multiple reflections are possible). The resulting resistance force acting on the body is time-dependent; we consider the time-averaged value of resistance. The problem is: given a convex body, find a roughening of its surface that minimizes or maximizes its resistance. (The problem includes mathematical definition of roughening.) This problem is solved using the methods of billiard theory and optimal mass transportation. Surprisingly, the minimum and maximum depend only on the dimension of the ambient Euclidean space and do not depend on the original body. In particular, the resistance of a 3-dimensional convex body can be decreased by (approx.) 3.05% at most and can be increased at most twice by roughening.
- April 18th, 2013 (10:00am - 10:50am)
- Seminar: Hyperbolic and Mixed Type PDEs Seminar
Title: On total variation bounds for inviscid, isentropic flow
Speaker: Kris Jenssen, Penn State
Location: MB216
Abstract: We will describe a recent result with Geng Chen ruling out certain types of variation bounds for isentropic Euler flow. We also comment on simple examples showing arbitrary magnification of variation.
- April 18th, 2013 (11:15am - 12:05pm)
- Seminar: Algebra and Number Theory Seminar
Title: Multiplicative and Inhomogeneous Diophantine Approximation
Speaker: Sanju Velani, University of York
Location: MB106
Abstract: http://www.math.psu.edu/rvaughan/PennStateNT2013.pdf
- April 18th, 2013 (02:30pm - 03:20pm)
- Seminar: PMASS Colloquium
Title: A short history of length
Speaker: Joel C. Langer, Case Western Reserve University
Location: MB113
A handy old device called a waywiser - basically a wheel and axle mounted on a handle - may be used to measure the length of a path, straight or curved. If the wheel is one meter in circumference, the waywiser measures the length of the path in meters by counting revolutions of the wheel as it is walked from beginning to end of the path. It works well enough in practice - but does it also work in theory? In fact, the waywiser and the concept of arc length may be used to illustrate both successes of ancient geometers and some of the struggles faced by subsequent mathematicians and philosophers in coming to terms with innity, innite processes and associated computations. The story of arc length alternates between geometry and the theory of numbers, between the continuous and the discrete, over two thousand years.
- April 18th, 2013 (03:35pm - 04:25pm)
- Seminar: Department of Mathematics Colloquium
Title: Metric Diophantine approximation: the Lebesgue and Hausdorff theories
Speaker: Sanju Velani, University of York
Location: MB114
There are two fundamental results in the classical theory of metric Diophantine approximation: Khintchine's theorem and Jarnik's theorem. The former relates the size of the set of well-approximable numbers, expressed in terms of Lebesgue measure, to the behavior of a certain volume sum. The latter is a Hausdorff measure version of the former. We discuss these theorems and show that Lebesgue statement implies the general Hausdorff statement. The key is a Mass Transference Principle which allows us to transfer Lebesgue measure theoretic statements for limsup sets to Hausdorff measure-theoretic statements. In view of this, the Lebesgue theory of limsup sets is shown to underpin the general Hausdorff theory. This is rather surprising since the latter theory is viewed to be a subtle refinement of the former.
- April 19th, 2013 (12:20pm - 01:30pm)
- Seminar: CCMA Luncheon Seminar
Title: About D'Alembert's paradox in mathematical fluid mechanics
Speaker: David Gerard-Varet, Jussieu Paris, France
Location: MB114
I will give a mathematical presentation of the so-called D'Alembert's paradox (1755): "Bodies moving at constant speed should not experience any drag or lift". Explaining this strange statement will lead us to discuss the mathematical difficulties associated with the transition from viscous to inviscid fluid models. This prepares for the colloquium talk I will give on boundary layer equations.
- April 19th, 2013 (02:20pm - 03:20pm)
- Seminar: Seminar on Probability and its Application
Title: Talk shifted to Math-Bio Seminar Tu 2:30
Speaker: David Koslicki, Oregon State University
Location: MB106
- April 19th, 2013 (03:35pm - 04:25pm)
- Seminar: Computational and Applied Mathematics Colloquium
Title: Mathematical theory of the boundary layer equations
Speaker: David Gérard-Varet, Mathematics, Université Denis Diderot Paris 7
Location: MB106
We shall discuss the mathematical theory of the Prandtl equations, involved in the description of high Reynolds number flows near a solid wall. The Cauchy problem for these equations is tricky, and turns out to be very dependent on the choice of the functional spaces, due to underlying fluid instabilities. The talk (or at least the end of it) will be based on recent joint work with N. Masmoudi.
- April 22nd, 2013 (09:00am - 11:00am)
- Seminar: Ph.D. Thesis Defense
Title: "An asymptotic Mukai model of M6"
Speaker: Evgeny Mayanskiy, Adviser: Yuri Zarhin, Penn State
Location: 132 EE East
I will talk about Mukai models of the moduli space of genus 6 curves
- April 22nd, 2013 (03:35pm - 04:35pm)
- Seminar: Center for Dynamics and Geometry Seminars
Title: Dynamical coherence and intrinsic ergodicity for partially hyperbolic diffeomorphisms isotopic to Anosov
Speaker: Todd Fisher, Brigham Young University
Location: MB114
We discuss partially hyperbolic diffeomorphisms that are isotopic to a hyperbolic toral automorphism and contained in a connected component. If the splitting of the partially hyperbolic diffeomorphism satisfies certain dimensional constraints, then we show the diffeomorphism is dynamically coherent. We then prove that if the center direction is one dimensional, then the topological entropy is locally constant and there is a unique measure of maximal entropy. This is joint work with Rafael Potrie and Martin Sambarino.
- April 23rd, 2013 (09:30am - 11:00am)
- Seminar: Hyperbolic and Mixed Type PDEs Seminar
Title: Systems with moving boundaries
Speaker: Giuseppe Coclite, University of Bari
Location: MB216
We consider a system of scalar balance laws in one space dimension coupled with a system of ordinary differential equations. The coupling acts through the (moving) boundary condition of the balance laws and the vector fields of the ordinary differential equations. We prove the existence of solutions for such systems passing to the limit in a vanishing viscosity approximation. The results were obtained in collaboration with Professor Mauro Garavello.
- April 23rd, 2013 (10:00am - 11:30am)
- Seminar: Ph.D. Oral Comprehensive Examination
Title: "Counting rational points near planar curves"
Speaker: Ayla Gafni, Adviser: Bob Vaughan, Penn State
Location: MB315
Abstract: http://ucs.psu.edu/service/home/~/comps%20abstract.tex?auth=co&loc=en_US&id=52953&part=2
- April 23rd, 2013 (11:15am - 01:15pm)
- Seminar: Ph.D. Oral Comprehensive Examination
Title: "Modular forms and de Rham cohomology"
Speaker: Haining Wang, Adviser: Winnie Li, Penn State
Location: MB106
- April 23rd, 2013 (02:30pm - 03:30pm)
- Seminar: GAP Seminar
Title: Dynamical Quantum Algebras, Quantum Function Algebras, and their Representations
Speaker: Bharath Narayanan, Penn State
Location: MB106
I will explain the representation theory for quantized function algebras and dynamical quantum algebraic structures on a simple Lie group. Dynamical Quantum Algebras are a class of important noncommutative algebras, originating in exactly solvable models in statistical mechanics and conformal field theory. They have also proven to be very useful for easily veriftying many identities of hypergeometric series. Quantized function algebras, commonly known as the quantum matrix algebras, are quantum versions of usual coordinate rings of Lie groups. They can also be viewed as degenerations of the dynamical algebras, by sending the spectral parameter to infinity, and have numerous applications in q-series, noncommutative geometry and mathematical physics. After an introduction to the basic characters of our investigation - the R-matrices, Yang Baxter equations, Hopf Algebroids and Dynamical Representations, we will explore important relationships between the different algebras and their irreducible representations, to discover a surprising result, known as "Self-Duality". The examples of sl2 and sl3 will be presented in detail since more or less all of the important ideas can be illustrated explicitly in these 2 cases.
- April 23rd, 2013 (02:30pm - 03:45pm)
- Seminar: Logic Seminar
Title: Graph limits and random graphs
Speaker: Jan Reimann, Pennsylvania State University
Location: MB315
When does a sequence of finite graphs converge? And what should the limit object be? With the theory of random graphs in mind, Lovász and collaborators over the past ten years have built an impressive theory of graph limits that brings together combinatorics, probability theory, and logic. The talk aims to give an overview of this theory, introducing the cut distance and graphons.
- April 23rd, 2013 (03:30pm - 06:00pm)
- Seminar: Working Seminar: Dynamics and its Working Tools
Title: Algebraic K-theory and its applications to dynamics, IV
Speaker: Kurt Vinhage, Penn State
Location: MB216
- April 23rd, 2013 (03:30pm - 05:00pm)
- Seminar: CCMA PDEs and Numerical Methods Seminar Series
Title: Reduction to Bidiagonal Form—New Algorithms and Issues
Speaker: Jesse Barlow, Department of Computer Science and Engineering The Pennsylvania State University
Location: MB023
Since Golub and Kahan's 1965 landmark paper, bidiagonal reduction has been an important first step in computing the singular value decomposition. The algorithm also plays an important role in the solution of ill-posed least squares problems and the computation of matrix functions. Two algorithms for bidiagaonal reduction were presented in that original paper---a Householder based reduction usually used for dense matrices and a Lanczos based reduction that is traditionally used to extract a subset of singular values and vectors from a large, sparse or structured matrix. Variants to the Householder based reduction have been proposed by Lawson and Hansen, Chan, and Trefethen and Bau. The Lanczos-based reduction has always suffered from the same problem as the Lanczos algorithm for symmetric matrices—loss of orthogonality in the reduction resulting in simple singular values converging as clusters. Simon and Zha proposed a version of the algorithm that reorthogonalizes just one of the two sets of Lanczos vectors, the speaker along with Bosner and Drmač developed a hybrid algorithm that produces one set of Lanczos vectors using Householder transformations, the other using the Lanczos recurrence. In this talk, a framework based on an observation by Charles Sheffield and recent work by Paige, is used to understand both the Simon and Zha and Barlow, Bosner, and Drmač variants of the Golub-Kahan-Lanczos (GKL) bidiagonal reduction. It is shown that if good orthogonality is maintained in just one set of Lanczos vectors, the algorithm retains a number of desirable properties. These include good orthogonality in leading left and right singular vectors, and that the algorithm acts exactly as the GKL algorithm in exact arithmetic on a nearby matrix. At the end of the talk, issues involving generalization to a block GKL algorithm and implementation are discussed.
- April 23rd, 2013 (05:00pm - 06:30pm)
- Seminar: SIAM Student Chapter Seminar
Title: Energetic Variational Approaches: Some Simple Examples
Speaker: Chun Liu, Pennsylvania State University
Location: MB106
- April 24th, 2013 (03:35pm - 04:35pm)
- Seminar: Center for Dynamics and Geometry Seminars
Title: The dynamics of Kuperberg flows
Speaker: Steve Hurder, University of Illinois at Chicago
Location: MB114
In 1993 the Seifert Conjecture was resolved by Krystyna Kuperberg, who constructed, for any 3-manifold, a smooth flow with no periodic orbits. Kuperberg introduced a completely new type of ``aperiodic plug'' for flows, that was used to trap their periodic orbits. The dynamical properties of the flows constructed via her method have remained only partly understood. The work described in this talk, which is joint with Ana Rechtman, explores their properties in greater depth. We introduce the notion of a "zippered lamination", and show that there exists an invariant zippered lamination for a generic Kuperberg flow. The study of the dynamics of zippered laminations leads to a precise description of the topology and dynamical properties of the minimal set for a generic Kuperberg flow, including a type of chaotic behavior with non-trivial entropy.
- April 25th, 2013 (10:00am - 10:50am)
- Seminar: Hyperbolic and Mixed Type PDEs Seminar
Title: Structure of shock-free solutions for 1-D compressible Euler equations
Speaker: Geng Chen, Penn State
Location: MB216
In this talk, we discuss a result with Robin Young for large shock-free solutions and shock formation on 1-D compressible Euler equations. A current work on general 1-D hyperbolic conservation laws will also be discussed.
- April 25th, 2013 (11:15am - 12:05pm)
- Seminar: Algebra and Number Theory Seminar
Title: Zeros of $\zeta$, of $\zeta'$, and of Siegel
Speaker: Maksym Radziwill, Stanford University
Location: MB106
Motivated by applications to the class number problem and the non-existence of Siegel zeros, Farmer and Ki have recently conjectured a precise relationship between the vertical distribution of the zeros of the Riemann zeta-function and the horizontal distribution of the zeros of \zeta'(s). I will describe the ideas behind my proof of Farmer and Ki's conjecture, the connection between the distribution of the three sets of zeros (of $\zeta$, $\zeta'$ and of Siegel), and the relevance of each to number-theoretic problems.
- April 25th, 2013 (01:00pm - 03:00pm)
- Seminar: Ph.D. Oral Comprehensive Examination
Title: "Local Rigidity of Algebraic Higher-Rank Abelian Group Actions"
Speaker: Kurt Vinhage, Adviser: Anatole Katok, Penn State
Location: MB114
Structural Stability of Anosov diffeomorphisms is a prized result in dynamical systems, and the stability of orbits in the flow case is the best that can be hoped for. Remarkably, in the case of higher-rank abelian group actions, one can expect something much stronger: First, the Anosov condition can be reduced to partial hyperbolicity. Second, orbit equivalence can be replaced by smooth conjugacy. A technique using algebraic K-theory was first introduced by Katok and Damjanovic to prove this in the case of Weyl Chamber flows in SL(n,R) and SL(n,C). Similar results will be presented in the case of quaternionic groups, and the scheme for completing the program for all simple noncompact Lie groups will be outlined.
- April 25th, 2013 (03:35pm - 04:25pm)
- Seminar: Department of Mathematics Colloquium
Title: Traces, fixed points, characters, loops
Speaker: David Ben-Zvi, University of Texas at Austin
Location: MB114
The dimension of a vector space, the trace of a linear map and the character of a group representation can be seen as instances of an abstract notion of character. I will explain how loop spaces and fixed points provide nonlinear analogues of these notions in the brave new world of derived algebraic geometry, a strange blend of topology and geometry. Following ideas from topological field theory, we'll see how passing back to the linear world results in interesting trace and character formulas. This is joint work with David Nadler (Berkeley).
- April 26th, 2013 (12:20pm - 01:30pm)
- Seminar: CCMA Luncheon Seminar
Title: Struggle with Discrete Stability and Convergence
Speaker: Leszek Demkowicz, ICES, University of Texas Austin
Location: MB114
I will review the history of analyzing stability and convergence of Galerkin methods including Finite Element methods. We will start with the main points of Babuska's Theorem and then review the history of the struggle from Ritz and Rayleigh, through Galerkin, Bubnow and Petrov, asymptotic stability result of Mikhlin, concept of optimal testing of Barret and Morton, stabilized methods including SUPG, bubble methods, DG methods and, finally, minimum residual methods including the DPG method.
- April 26th, 2013 (02:20pm - 03:20pm)
- Seminar: Seminar on Probability and its Application
Title: Poisson limit theorem for Gibbs-Markov systems
Speaker: Xuan Zhang, PSU
Location: MB106
Sinai studied Poisson limit distribution behaviour for eigenvalues in the quantum kicked-rotator model. Inspired by Sinai's work, Pitskel investigated the Poisson limit distribution for return times of dynamical systems. He proved results for Markov chains with finite states and for hyperbolic toral automorphisms. Independently Hirata proved his result for subshifts of finite types with Gibbs measures and for Axiom A systems. Many results have been proved for diffenrent kinds of systems in recent years. In this talk, we will try to explain that Poisson limit distribution also exists for Gibbs-Markov systems. Certain Markov chains with countable states will be special cases. We basically follow Hirata's method with a few revisions.
- April 26th, 2013 (03:35pm - 04:25pm)
- Seminar: Computational and Applied Mathematics Colloquium
Title: Discontinuous Petrov Galerkin Method (DPG) with Optimal Test Functions
Speaker: Leszek Demkowicz, ICES, UT Austin
Location: MB106
I will give a short tutorial on the DPG method proposed by Jay Gopalakrishnan and myself four years ago, emphasizing the main points and illustrating them with numerical examples. Here is a few of them: 1/ The DPG method is a minimum-residual method with the residual evaluated in a dual norm. 2/ The method can be interpreted as a Petrov-Galerkin method with optimal test functions (realizing the sup in the inf-sup condition). 3/ The optimal test functions are computed on the fly by inverting (approximately) the Riesz operator corresponding to the test space. 4/ With broken test spaces and localizable norms, the inversion is done elementwise, i.e. the optimal test functions are computed within the element routine. This is more expensive then for standard FE method but it is compatible with the standard FE technology. 5/ The main price paid for the localization is the presence of additional unknowns: traces and fluxes. Compared with standard conforming FE methods or hybridizable DG methods, the number of (non-local) unknowns doubles and it is of the same range as for DG methods. Contrary to DG methods based on numerical flux, in the DPG method, the flux enters as additional unknown. 6/ The method can be interpreted as a preconditioned least squares method. The stiffness matrix is hermitian and positive-definite. Its condition number is the same as for standard FEs. 7/ The formulation based on a first order system is very natural but not necessary. You can work with the second order equation if you wish. The key point is to break the test functions. 8/ There is nothing exotic about the ultra-weak variational formulation behind the DPG method. If the operator is well posed in the L^2 sense (the operator is L^2 bounded below), the ultra-weak variationalformulation is also well posed with the corresponding inf-sup constant being of the same order. 9/ With the use of optimal test functions, the issues of approximability and stability are fully separated. This is illustrated by using hp-adaptivity. 10/ The method is especially suited for singular perturbation problems e.g. convection-dominated diffusion, high wave number wave propagation, elasticity for thin-walled structures etc. For problems of this type, one can systematically design a test norm to accomplish robustness, i.e. a stability uniform in the perturbation parameter. 11/ If you have a hybrid FE code, converting it to a DPG code is very easy. 12/ The methodology extends to nonlinear problems. I will show examples for compressible NS equations.
- April 29th, 2013 (01:00pm - 03:00pm)
- Seminar: Ph.D. Oral Comprehensive Examination
Title: "Long-time Behavior of Stochastic Models"
Speaker: Chao Tian, Adviser: Qiang Du, Penn State
Location: 104 Osmond
In this talk, I will present two examples to illustrate the rich long time dynamics of stochastic models. The first example is related to fluid-structure interaction (FSI) which appears in many scientific and engineering problems. The stochastic implicit-interface method (SIIM) is designed to account for the microscopic fluctuation in phase-field or level-set models of FSI. Formulated as a system of non-linear stochastic partial differential equations with a degenerate additive noise term, the SIIM is formally derived using the fluctuation-dissipation theorem. It is interesting to study its long time asymptotic behavior. The second example is a bi-stable mean-field model whose mathematical analysis, including the study of mean-field limits, existence of multiple equilibria, and fluctuation theory was initiated by D.A. Dawson et al. Using the large-deviations theory G. Papanicolaou et al. recently studied the dynamical phase-transitions in such systems due to stochastic fluctuation. We consider various generalizations of such mean-field models and study the phase transitions between different equilibria in various settings.
- April 29th, 2013 (03:30pm - 05:00pm)
- Seminar: Probability and Financial Mathematics Seminar
Title: Long-Run Bond Risk Premia
Speaker: Olesya Grishchenko, Federal Reserve Board, Washington
Location: MB315
NOTE: if you are interested in being on the mailing list for this seminar, please contact one of the organizers (nistor at math dot psu dot edu or mazzucat at math dot psu dot edu) to request that you be included in the list. Abstract of the talk: In the paper that I will present, we rationalize the failure of the expectations hypothesis and the time-varying bond risk premia in the generalequilibrium model with the long-run consumption risks coupled with stochastic consumption volatility process coupled with recursive preferences and inflationuncertainty dynamics, which interact with both consumption growth and volatility. The last two effects are also present in the inflation modeling, and thusaffect both real and nominal side of the economy. This link paves a way of explaining long standing puzzle of the failure of expectations hypothesis, which wasearlier attempted to be explained only via a real economy variables. This is joint work with Hao Zhou.
- April 29th, 2013 (03:35pm - 05:35pm)
- Seminar: Center for Dynamics and Geometry Seminars
Title: Arnold Diffusion via Invariant Cylinders and Mather Variational Method
Speaker: Vadim Kaloshin, University of Maryland TWO HOUR TALK
Location: MB114
The famous ergodic hypothesis claims that a typical Hamiltonian dynamics on a typical energy surface is ergodic. However, KAM theory disproves this. It establishes a persistent set of positive measure of invariant KAM tori. The (weaker) quasi-ergodic hypothesis, proposed by Ehrenfest and Birkhoff, says that a typical Hamiltonian dynamics on a typical energy surface has a dense orbit. This question is wide open. In early 60th Arnold constructed an example of instabilities for a nearly integrable Hamiltonian of dimension $n>2$ and conjectured that this is a generic phenomenon, nowadays, called Arnold diffusion. In the last two decades a variety of powerful techniques to attack this problem were developed. In particular, Mather discovered a large class of invariant sets and a delicate variational technique to shadow them. In a series of preprints: one joint with P. Bernard, K. Zhang and two with K. Zhang we prove Arnold's conjecture in dimension $n=3$.
- April 30th, 2013 (10:00am - 12:00pm)
- Seminar: Ph.D. Oral Comprehensive Examination
Title: "Modular forms for finite index subgroups of SL(2,Z)"
Speaker: Will Chen, Adviser: Wen-Ching W. Li, Penn State
Location: MB113
Since its inception, the theory of modular forms has almost exclusively focused on modular forms for congruence subgroups, for which a beautiful and deep theory has been developed culminating in the celebrated proof of the modularity theorem and FLT. On the other hand, very little is known about the world of modular forms for noncongruence subgroups. A theorem of Belyi implies that every smooth projective curve defined over a number field can be realized as a modular curve, usually noncongruence. Thus, noncongruence modular curves are very general, and one might expect that as a result, relatively little can be said about them. On the other hand, their uniformization by the upper half plane is rather special, and hence one might hope that there maybe be at least certain classes of noncongruence modular curves for which a theory comparable to that of congruence curves may be established. In my talk, I'll compare the two worlds, highlighting their key differences, as well as some striking similarities. I will conclude the talk by presenting some directions for further investigation.
- April 30th, 2013 (01:30pm - 02:30pm)
- Seminar: Probability and Financial Mathematics Seminar
Title: Optimal Bidding in a Limit Order Book
Speaker: Giancarlo Facchi, PSU, Mathematics
Location: MB106
Abstract: http://
An external buyer asks for a random amount $X>0$ of a certain asset. This agent will buy the amount $X$ at the lowest available price, as long as this price does not exceed a given upper bound $P$. One or more sellers are competing to fulfill the incoming order, by offering various quantities of the same asset for sale at different "limit" prices. The collection of all these sell orders at different prices is the "Limit Order Book". Having observed the prices asked by his competitors, each seller must determine an optimal pricing strategy, maximizing his expected payoff. Clearly, when other sellers are present, asking a higher price for the asset reduces the probability of selling it. In our model we assume that the $i$-th seller owns an amount $\kappa_i$ of stocks. He can put all of it on sale at a given price, or offer different portions at different prices. If the selling prices are allowed to be any real number in $[0,P]$, then a general pricing strategy is described by a measure on $[0,P]$. We analyze in detail two different scenarios. Let $\psi(s) = {\rm Prob.}[X>s]$ denote the tail distribution function of $X$. \begin{itemize} \item If $(\ln\psi(s))^{\prime\prime} \geq 0~ \forall s$, then a unique Nash equilibrium exists and can be explicitly determined in the special case where every player has the same payoff function. We show that the all the optimal strategies (except at most one) consist of measures which are absolutely continuous with respect to the Lebesgue measure. \item If $(\ln\psi(s))^{\prime\prime} < 0~ \forall s$, a Nash equilibrium does not exist, and the competition between sellers does not settle near any equilibrium state. \end{itemize} We also consider a different model where there is a positive tick size, which means that the only admissible pricing strategies are purely atomic, supported on a finite set of prices. In this case, we can prove the existence of Nash equilibria also in the more general case of heterogeneous players. Moreover, as the tick size goes to 0, any weak limit of discrete Nash equilibria provides a Nash equilibrium for the continuum model.


text:
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Attorney fees awarded by the court on appeal shall be in the sum of twenty-five dollars ($25), and shall be awarded to the prevailing party without any showing required by Rule 54(e).
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Lives in San Francisco, CA, United States
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Canon EOS 1DSII
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On article iFixit tears down iPhone 5, reveals new camera sensor and sapphire glass lens (105 comments in total)
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vFunct: How long before the iPhone camera has an image stabilizer? I know cell phone cameras are starting to put them in already.
Image stabilization could add 4 stops of light-gathering, a huge improvement, plus reduce camera shake for video.
iphone cameras are already stabilized starting with iphone 4.
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Ami by Je Joue 3 Step Luxury Kegel Balls
Average customer review 4.5 out of 5 stars12 reviews
A luxury silicone kegel set presented in beautiful gift packaging. A three-step system, each step has a differently shaped and weighted exerciser to effectively tone your pelvic floor to increase sexual sensitivity and intensify orgasms.
Only: $79.95
Product Description
A luxury silicone kegel set presented in beautiful gift packaging. A three-step system, each step has a differently shaped and weighted exerciser to effectively tone your pelvic floor to increase sexual sensitivity and intensify orgasms.
Use Ami regularly to tone and strengthen your PC muscles and enjoy more intense, easy-to-achieve orgasms from penetrative pleasure. Plus, with internal free-moving jiggle balls, every movement you make while wearing them results in an internal tickle you simply can't ignore!
Unlike many other kegel systems, this set comes with 3 x different weighted balls to guide you through a full workout regime. Work your way from beginner to advanced level kegel exercises with one, easy-to-use kit.
Always use a generous helping of water-based lubricant for easy insertion and maximum pleasure.
Key Features:
- A fully comprehensive 3 step silicone kegel system for a complete pelvic floor workout from beginner to advanced levels
- Actively exercises and tones pelvic floor muscles for enhanced orgasms and improved muscle control
- Beginner's Ami 1 weighs 47g and has a 4.3 inch girth for first time kegel exercisers
- Intermediate Ami 2 weighs 78g and has a 3.9 inch girth to further your workout progress
- Advanced Ami 3 weighs 106g and has a 3.6 inch girth for the ultimate test to your vaginal strength
- Ergonomic retrieval loops make removal easy
- Presented in a beautiful keepsake box
How it measures up
- Length: 3.14 inches
- Insertable Length: 3.14 inches
- Base type: Finger Loop
How it feels
- Material: Silicone
- Flexibility: Firm
- Waterproof: Submersible
- Contains latex: No
Product Videos
Ami by Je Joue 3 Step Kegel System
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A luxury silicone Kegel set presented in beautiful gift packaging. A three-step system, each step has a differently shaped and weighted exerciser to tone your pelvic floor, increasing your sexual sensitivity and improving your sexual pleasure.
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To watch videos, you need Version 9 or greater of the Flash Player. Click here to see which Flash Version you have. If you have Version 8 or less, get the latest Flash Player here.
Kegel balls strengthen your pelvic floor muscles, and a stronger pelvic floor means a tighter vagina, better bladder control and improved sex for you and your partner. Annabelle Knight explains which are the best kegel balls for beginners and how to use them. Read more: How to Use Kegel Balls.
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Customer Reviews
Ami by Je Joue 3 Step Luxury Kegel Balls 12 4.5 out of 5 stars
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Ami by Je Joue 3 Step Luxury Kegel Balls
Only: $79.95
Ami by Je Joue 3 Step Kegel System
Reviewed: 11 February 2016 by Victoria85, a Straight Going Steady Female
I purchased these kegal balls (I say balls, but only one of them is actually ball-shaped) a couple of years ago now, but didn't want to review them until I had given them plenty of time to 'do their thing' and I have to say that I am very impressed.
The reason I purchased these was primarily because I had noticed that I wasn't able to hold my water quite as easily as I once did and so although I was not actually feeling "loose" down there (my partners have always made a point of telling me I am quite the opposite in fact!), I thought that things could maybe do with a bit of toning.
Feeling brave and adventurous, I actually went straight to the third and most heaviest of the selection which comes in this (beautifully presented!) box, which is described as being for "advanced" users who have built their way up to it. My boyfriend and I did laugh about the fact that as I could easily hold the smallest and heaviest all day straight away, I must therefore have an "advanced" vagina haha.
I will admit that it was slightly difficult to hold for more than a couple of hours or so at the beginning. I recall one incident where I squatted to get something out of a cupboard and lost it on the kitchen floor haha. This was only a problem because I was not wearing underwear to catch it of course and fortunately I was home alone, so it was funny more than anything else and certainly gave my boyfriend something to chuckle about when I told him that the "purple snowman" as he affectionately named it, made a surprise appearance!
As I say, that was a one-off mishap, usually these stay firmly in place (well, it did for me, but then I have not had any children so this probably helps) but I did noticed at first that after a few hours of wear, sometimes I would sit down and be able to feel it - much like when you have not inserted a tampon far enough. I simply pushed it a bit further up and this was soon remedied though.
I've not used these religiously, I tend to forget about them for a few months and then get them out again, but I think they have definitely improved things down there as I can now hold (the smallest and heaviest) for the best part of the day (when I'm at home - I have not felt inclined to wear it to work!) without any problem at all. I actually forget it is there, until it has been in for many hours and then it can sometimes start to feel slightly uncomfortable - not painful, but just heavy, just like your arms feel if you've been carrying heavy bags for too long!
I can't remember the last time I had to run for the toilet either, so mission accomplished!
If you want to improve your muscle tone 'down there' and are willing to invest in some high quality toys to do so, then I can't recommend these enough. They not only seem to work, but are literally a pleasure to use - in more ways than one!
- Pros
- Luxury packaging; and that same luxury extends to the product itself - "top drawer".
- Cons
- Maybe a little pricey, but as they say "You get what you pay for".
- Bottom line
- I think these are my favourite sex toy purchase - and I've made a few!
- Was this review helpful to you? Yes
Every woman should have some balls
Reviewed: 27 July 2015 by Gfi, a Bisexual Going Steady Female
When I opened the discreet LH parcel, I continually said 'oooooo' as I looked at the packaging of this product. The three balls come in a box that has indentations to keep them in place, and the box feels luxurious and looks great.
I immediately wanted to try them. Having never used Kegel balls before, I read the leaflet and decided I should start with the first single ball as advised. I put it in and was immediately aroused when using it. I did a few pelvic floor exercises and then went to the shops and a little walk.
The weighted ball inside the ball jiggles around with every movement and is very pleasurable. The weight is a good start as you can feel it, but it is not uncomfortable.
I was pleased to arrive home as I was very aroused by this point and wanted to play. The ball was easy to take out with the retrieval cord, which feels very secure, which means you don't have to worry about getting it out.
I know that these balls are essentially exercising balls, but they are more than that in my eyes. It makes you very aware of every muscle in your vagina and encourages you to use them while heightening the sensitivity.
I have used the second stage in this set also - just to have a little try of what it was like and that was also very pleasurable. I become so aroused when using these balls it can become a wonderful battle. But in the end, it simply enhances play and makes the wait so worth it.
I cannot recommend these enough. Everyone should exercise their vagina, and doing it in such a pleasurable way makes it so easy. Je Joue products are excellent quality and feel like a designer product in both the design and quality. They are easy to use and pleasurable from the first second.
Every woman needs a set of balls and these tick all the boxes. Whether you are a beginner or more experienced, there is a ball in this set for everyone. As I become more experienced and use the heavy balls, I am sure I will still use the lighter ball for more prolonged periods of time.
Overall, a full work out for the most precious muscles in my body!
- Pros
- Everything, a wonderful high-end quality item.
- Cons
- Nothing.
- Bottom line
- A must for women wanting to enhance their vagina.
- Was this review helpful to you? Yes
Order by:
Ami by Je Joue 3 Step Kegel System
Reviewed: 20 April 2015 by Vanessa95, a Straight Going Steady Female
What an awesome and fun way to get a good, successful Kegel workout!
Je Joue products are all fantastic just the same. However, this product has definitely made it to my top 10.
The Kegel ball set is made of the softest silicone, very comfortable to wear for long periods of time. The three different sizes offered in one set are ideal for those like me who do not like having to go looking for each item separately. Various levels of difficulty allow you to monitor your progress and actually see your improvement as well as feel it.
Although the products are not meant to make huge changes over night, I found that after wearing the Ami 2 for about 8 hours my vagina was actually tighter during intercourse that night!
I would recommend these Kegel balls of any other ones on the market.
Well worth the money.
- Pros
- The ease of use and gorgeous design.
- Cons
- Loved all of it.
- Bottom line
- Amazing, high quality, luxury product!
- 1 person found this review helpful. Was this review helpful to you? Yes
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text: Here's another D Empire employee, sweet Laura Byrom. She was just a wee thing in 1988 but not young enough to have escaped the '80s perm epidemic. At first I thought her hair was crimped (I was all about the crimper back in the day), but then I turned the picture over and saw that her mom had written "new permanent" on the back. Mystery solved. The perm strikes again.


text:
R/C Omniwheel Robot
A robot that can move in any direction immediately is useful for getting around tight spaces and for behaviors like chasing (or fleeing). No matter how fast an R/C car is, there's no way it can catch something that can instantly go any direction, even sideways. Regular car-style robots can't drive sideways, but omniwheel robots can! Read more »


text:
Illinois State Rep. Don Moffitt today endorses State Senator Kirk Dillard (R-Hinsdale) for Governor and he called Dillard "uniquely qualified" to be governor, the Dillard campaign announced.
Three other Republican candidates are seeking the nomination of the party, for the right to face incumbent Democratic Governor Pat Quinn. The other three candidates are the following: Bruce Rauner of Winnetka, Illinois State Sen. Bill Brady of Bloomington and Illinois State Treasurer Dan Rutherford of Chenoa.
The Moffitt endorsement comes on top of endorsements from two former Republican governors, Jim Edgar and Jim Thompson. Moffitt commented on those endorsements. "Given their personal experience (Edgar and Thompson) with the position, it's telling that the last two successful Republican governors have thrown their support behind Kirk,"" said Moffitt. "One of the biggest assets Kirk Dillard brings to the table is his understanding that managing state government means living within our means, which will require tough choices. Illinois needs a Governor who understands how the budget is spent and will tackle runaway spending with a scalpel- not a hatchet."
Moffitt highlighted the importance of lowering the unemployment rate in Illinois and creating jobs.
"We need a Governor who can turn around the business climate in Illinois. Senator Dillard has proven himself to be a successful advocate for job creation while he was chief of staff to Governor Edgar and as a State Senator by shepherding legislation through the statehouse that brought businesses and jobs to Illinois," said Moffitt.
Moffitt pointed out that Dillard's unique experience having served as Chief of Staff for Governor Edgar, gives Dillard the leadership skills needed in Illinois.
The other candidates for governor are having their troubles, something that Dillard has avoided thus far.
Bruce Rauner is having his troubles ranging from his daughter's enrollment in a Chicago Public School by picking up the phone and call then-CPS Chief Executive Officer Arne Duncan, who in turn called the principal of Walter Payton College Prep to ensure her enrollment.
Bill Brady is floundering in his fundraising and question recently arose about a vote on tax subsidies in the state senate, which raised ethics issues because it directly benefited a family member.
Illinois State Treasurer Dan Rutherford has even bigger troubles, if true, of sexual harassment of an employee of the Treasurer's office.
Related pieces about Bruce Rauner by John Presta:
Bruce Rauner, GTCR nursing home lawsuits
Bruce Rauner is the Mitt Romney of Illinois politics (Part 1)
Bruce Rauner is the Mitt Romney of Illinois politics (Part 2)
Bruce Rauner is the Mitt Romney of Illinois politics (Part 3)
Bruce Rauner campaign 'minimum wage' snafus
Bruce Rauner says lower Illinois minimum wage
Bruce Rauner raises $4 million
Senator Kirk Dillard campaign
Send John Presta an email and your story ideas or suggestions, email@example.com.
More MrGrassroots:
Suggested Links
- Beatles invasion was 50 years ago: Sunday, Feb. 9, 1964 on Ed Sullivan Show
- Bruce Rauner 'term limits' plan also not good enough for Bruce Rauner (Opinion)
- Kirk Dillard announces digital online strategy, ads targeting GOP primary voters
- Dan Rutherford staffer resigns, charges sexual harassment and political coercion
- Kirk Dillard stock is rising from dysfunctional Illinois GOP gubernatorial field


text:
Department for Transport announces £5 million funding for Bikeability Plus scheme
New school bike training programme to create safe and confident young riders
British Cycling welcomes funding for Bikeability cycle training in schools
Department for Transport announce plans to spend £50m over the next four years to support the programme.
About cycling training
About Bikeability
Bikeability teaches trainees the necessary skills to ride confidently on today's roads.
Become an instructor
Learn about our training programme which equips instructors and assistant instructors with the necessary expertise to deliver engaging and effective Bikeability sessions.
Develop your instructing
Opportunities for instructors to enhance their development, learn additional skills or build upon existing skills that will help with the development of their career or themselves.
Get Halton Cycling
British Cycling's Cycle Training Team is working with a number of partners to run events and get whole communities involved in cycling.
Manchester City Football Club Summer School
British Cycling's three-day summer school with Manchester City Football Club is back – and with two courses, this time it's double the fun!


text:
After having great success in Dallas for the last two years, Humanity First Meena Bazar fundraiser event is coming to the Atlanta Metro area. Humanity First is a non-profit organization registered in about 41 countries across 6 continents with a focus on disaster relief and human development projects.
The term "Meena Bazar" has its roots in South East Asia where in the era of Mughal emperors, Meena Bazaars, also known as Khush Ruz ("Day of Joy") were exclusively held for women, while the emperor and a few princes were the only males present. On similar lines, this upcoming event is women's only, meaning all the vendors and attendees will be women but children are welcome to accompany their mothers.
Since 1994, Humanity First U.S.A has set itself apart from other similar non-profits by spending more than 90 percent of the money raised on programs to relieve suffering caused by natural disaster and human conflict and also, those related to education and health.
To date, Humanity First volunteers have served people from across the globe including those affected by earthquakes in Turkey, Japan, Pakistan, and Iran, and by floods in Africa and Latin America. Locally, they helped fellow Americans who were hit hard by hurricanes (Katrina, Rita and Sandy), tornadoes (Kansas) and wild fires in California.
Additionally, as a response to the recent Ebola virus outbreak, Humanity First is working closely through its local presence in Ebola affected countries including Liberia. It is sending medical supplies like personal protective equipment (PPE), disposable goggles and disposable masks to affected areas through active working local clinics and humanitarian organizations which are receiving patients.
When it comes to programs specific to the U.S, Humanity First it is currently focusing on two strategic initiatives- "Our Kids, Our Future" (OKOF) and "Feed the Hungry". Funds raised through Humanity First U.S.A's first Meena Bazar in Georgia on September 6 will go to these two programs.
OKOF program recognizes that our nation's public school systems have been historically underfunded and understaffed and this is especially true of the schools belonging to the low-income communities.
Hence, this program aims to empower the community, school staff and students from those underprivileged school districts of the country by offering services including tutoring and mentoring programs for students, providing computers for class rooms, donating school supply kits, and much more. So far this initiative has served schools in Chicago, Baltimore, Portland and San Jose.
Now let's look at the other initiative.
While the statistics indicate that 48.8 million Americans including 16.2 million children and 6 million seniors struggle with hunger, what people might not recognize is that about 220 billion pounds of food is thrown away each year, an astounding number by any standard. Therefore, the mission of "Feed the Hungry" program is to reduce hunger in America by creating awareness about food and water wastage in the country.
Humanity First Meena Bazar hopes to highlight both of these important issues affecting our society so it is important to show support. Ladies and children (ten or younger) are encouraged to drop by day of event for a great experience and everybody is welcome to donate online at this link.
The booths will have Indian clothing, jewelry, makeovers, henna tattoos, food and much more.
So, come out to show support for this wonderful non-profit organization at the Atlanta Events Hall, 3750 Venture Dr. in Duluth from noon to 6 p.m. on September 6, 2014. There is no entry fee and parking is complimentary.
"We are motivated by love and compassion of mankind", stated Mahmooda Rehman who serves as the local Humanity First Ambassador. "I am excited about Humanity First Atlanta and …would like to encourage ladies to participate in this women's only humanitarian fundraising event", she added.
For further information please email at firstname.lastname@example.com or call (404) 395-3213.


text:
Redshirt freshman Daliadiz Ortiz is continuing her outstanding season, notching a new personal best at the Stanford Invitational
April 4, 2014
STANFORD, Calif. - Two Tulane freshman track and field throwers in Daliadiz Ortiz and Taylor Potts posted new personal bests against some of the nation's top competition at the Stanford Invitational on Friday evening at Cobb Track and Angell Field, highlighting a day of solid outings by some of the Green Wave's top competitors in that competition as well as the San Francisco State Distance Carnival.
Ortiz and Potts who competed in the invitational portions of their events stepped up to the challenge on Friday, improving their marks that already stood within Conference USA's best coming into the meet. Ortiz notched a second-place finish in the javelin with a toss of 49.28 meters (161-08) that doubles as the fifth-best throw in Tulane school history. The native of Puerto Rico bounced back after tossing the shortest throw of her collegiate career at the Tulane Team Challenge last weekend.
"Dali had a significant level of improvement today," said Tulane track and field director Eric Peterson. "This is a redshirt freshman who suffered a very significant injury last year, and she has recovered so nicely to the surgery and from the extensive rehab. Today, for the first time, I saw things beginning to click for her, positively. Dali came away from this event today feeling more optimistic and more confident than I have seen her since she has been with us at Tulane."
Potts also notched a new career high, as she posted a 13.76 meter (45-1.75) throw, good for five centimeters longer than her previous best. The Fishers, Ind., native placed eighth in the shot put invitational on Friday.
"From a true freshman, I'm not sure I could want anything more," mentioned Peterson. "She's been so consistent the last few months. Under very adverse weather conditions today, she was able to throw as well as she did at a major-level competition. It is a very good sign for her, her development and her maturity."
A few of the men had eye-catching performances, too. Sophomore Devon Breaux and junior Taurean Nixon - two all-around athletes who also play football for the Green Wave - came out on top in their competitions on the day.
Nixon competed in the 100 meter dash, and made the finals out of nearly 40 participants despite adverse weather conditions, as he placed eighth in the preliminary round with a time of 10.80. In the final portion of the event, he also placed eighth, running just three tenths of a second slower than his prelim time. Nixon's performance in the 100 meter dash marked the first time he competed in an individual event during his tenure with the Tulane track and field program.
"The wind was so unpredictable today," said Peterson. "One section would be wind-aided, and the next race would be into a head-wind. That's how quickly it would change. It was cold and damp, and with the wind being unpredictable, Taurean's time is far more than what the time suggests. He made the final and almost duplicated his qualifying time. For a sprinter who isn't doing this full time, I'm really excited about that. I'm looking forward to what he will be able to do with the 4 x 100 meter relay on Saturday."
Breaux competed in the invitational section of the long jump, posting a leap of 7.27 meters (23-10.25) to place fourth. Last weekend, Breaux fouled in the long jump during his season debut, but is coming off one of the top seasons by a men's track and field athlete from Tulane. Breaux was named the 2013 Top Freshman during the Conference USA Outdoor Championships after placing in the top three in both the long jump and triple jump. He even qualified for the NCAA Regionals, marking the first time a Tulane men's track and field athlete competed at the NCAA Regional level.
"Devon had a very good series of jumps today, and he did a much better job of being relaxed on the runway," stated Peterson. "He was very in-control of his emotions. He posted a mark and competed at a level that is far ahead of where he was this time last year when we were at this meet. For him to show poise and maturity and be able to apply that to his jumping is exciting for all of us."
In the same part of the country, five Tulane mid-distance runners competed at the San Francisco State Distance Carnival, and all posted solid results. In the 800 meters, sophomore Jessica Adamson and freshman Sara Kebede placed fourth and eighth overall, respectively, with new top marks of 2:12.60 and 2:14.49. Junior Michelle Kreutzberg was not far behind in the event, as she placed 17th with a time of 2:17.36. Kebede won her heat in the event.
In the 1,500 meters, freshman Kade Kistner won his heat with a time of 4:01.52 - a new personal best - while sophomore Jack White placed 20th overall with a time of 3:54.73, just three one-hundredths of a second off his top time in the event during his career.
"For those kids to go out and perform at the levels they did makes this experience very worthwhile," added Peterson. "Jack was just a few hundredths of a second off his top time, and Kade and Sara won their heats. Jess was in the lead in the top section of that event until the final 30 meters. I know all of these kids came away from this meet feeling good about themselves, and that will help us generate some positive momentum."
As a whole, Peterson was impressed with his student-athlete's performances on the day.
"We are seeing the kind of improvement we are hoping for and expecting from the team," said Peterson. "We've made some significant steps, and it makes me feel good about how we've started this meet off."
Due to the late start time in the 10,000 meter run at the Stanford Invitational, junior Paige Callahan's results will be reported on during Saturday's wrap up.
On Saturday, the Green Wave will return to Cobb Track and Angell Field on Stanford's campus to compete in the 200 meter dash, the 400 meter dash, the 800 meter run, the pole vault, the women's triple jump invitational and the men's 4 x 100 meter relay.
Fans can follow the Tulane track and field programs on Twitter (@GreenWaveXCTF) or on Facebook at http://www.facebook.com/TulaneXCTF.
Tulane Results for the Stanford Invitational
Women's Long Jump Invitational
t-6. Tamika Brazzel, 5.57m (18-3.25)
Women's Pole Vault Invitational
t-6. Joanna Lapucha, 3.67m (12-0.5)
Women's Javelin Throw Invitational
2. Daliadiz Ortiz, 49.28m (161-08) *
Women's Shot Put Invitational
8. Taylor Potts, 13.76m (45-1.75) *
Men's 100 Meter Dash
8. Taurean Nixon, 10.80 ^
29. Richard Allen, 11.21 ^
Men's 100 Meter Dash Final
8. Taurean Nixon, 10.83
Men's 400 Meter Hurdles
31. Justyn Shackleford, 56.85
Men's Long Jump Invitational
4. Devon Breaux, 7.27m (23-10.25)
Men's Pole Vault Invitational
--Caleb Bertrand, NH
Men's Discus Throw
5. Thomas Lynch, 48.44m (158-11)
Tulane Results for the San Francisco State Distance Carnival
Women's 800 Meter Run
4. Jessica Adamson, 2:12.60 *
8. Sara Kebede, 2:14.49 *
19. Michelle Kreutzberg, 2:17.36
Men's 1,500 Meter Run
20. Jack White, 3:54.73
44. Kade Kistner, 4:01.52 *
^ = Prelim Time
*= Personal Best


text:
In Case You Missed It - Top stories from the past week
Published: Saturday, August 3, 2013 at 4:30 p.m.
Last Modified: Saturday, August 3, 2013 at 1:32 a.m.
Some of the top stories in the StarNews from the past week:
School meals healthier, but cost more
SOUTHEASTERN N.C. | Eating healthy doesn't come cheap. School districts serving lunch to thousands of students every day have known that for years.
But since 2010, a federal law has required schools to start serving more fruits, vegetables and whole grains – healthier choices that are also more expensive.
To cope with the higher costs, the law is also requiring districts to up the price students pay for lunch.
Controlling birds at the landfill
NEW HANOVER COUNTY | Just over a month after receiving federal permission, officials at the county landfill have killed 131 seagulls and scared away – at least temporarily – thousands more.
The county took the step to control the birds after flocks of up to 6,000 seagulls would converge on the landfill at certain times – especially when garbage from restaurants containing food scraps would be delivered to the facility on U.S. 421 North.
But the birds are learning. Shots from a pyrotechnic gun that would scare them off for hours now only works for minutes at a time.
Fake private investigator charged
OAK ISLAND | An Oak Island man was charged last weekend with performing investigative services without a license, a little more than a month after a Wake County judge forbid him from doing so.
Bill J. Hagler, 61, was charged on two felony counts of acting as a private investigator without a license.
Hagler is a former bounty hunter and lists himself as an expert witness on various websites.
Sewage spills into Hewletts Creek
WILMINGTON | A power failure during a storm Monday afternoon caused nearly 442,000 gallons of untreated sewage to spill into Hewletts Creek from a Cape Fear Public Utility Authority pump station.
The sewer overflow began around 3:15 p.m. at the pump station near the intersection of Pine Grove Drive and Greenville Loop Road and it was not stopped until around 4:45 p.m., according to an authority news release.
Thalian curtain could be oldest in U.S.
WILMINGTON | Thalian Hall houses what might be the oldest painted stage curtain in the United States.
Most surviving examples of drop curtains date from only the 1890s at the earliest, according to a visiting theater historian.
Thalian Hall, however, still has its original drop curtain, which hung onstage when the historic theater opened on Oct. 12, 1858.
Reader comments posted to this article may be published in our print edition. All rights reserved. This copyrighted material may not be re-published without permission. Links are encouraged.


text:
Geoff McIntyre
Geoff McIntyre, CA is the Agri-Food Leader for MNP's Okanagan region. Based in Kelowna, he specializes in serving clients in the B.C. wine industry to help them achieve their goals through a full-range of accounting, consulting and tax services. Recognized for his industry insight, Geoff is a regular contributor to Grapes to Wine and Orchard and Vine magazines. He will be the host of this exclusive event.
Location, Schedule and Registration:
Tuesday, February 18th, 2014
8:00 a.m. – 8:30 a.m.: Continental Breakfast
8:30 a.m. – 12:00 p.m.: Presentations & Discussions
White Oaks Resort & Spa
253 Taylor Rd. SS4, Niagara-on-the-Lake, ON
RSVP DEADLINE: Monday, February 10th, 2014
If you have troubles registering for this event, please email email@example.com
About our MNP Speakers:
Kal Ruprai
Kal Ruprai, MBA, CMA is the leader of MNP's Ontario Indirect Tax practice. Based in Toronto, Kal brings more than 18 years of experience practicing exclusively in indirect tax in government, large corporate and public accounting environments. He works closely with clients in a variety of industries to address their complex indirect tax issues and delivers effective tax planning strategies to help them achieve their goals.
MNP, in collaboration with the Canadian Vintners Association, is looking forward to hosting an interactive workshop for our valued clients and key industry participants to discuss opportunities that the online retail market offers local wineries.
Our team and other leading industry experts will present on key business topics so you have the practical and relevant tools needed to ship wine inter-provincially–and to successfully capture your share of the market. Speakers will provide up-to-date information on the political landscape, the legal requirements and tax issues involved with direct-to-consumer wine shipments to provinces across Canada, along with other insight on important business topics.
Dan Paszkowski
Dan Paszkowski is the President and CEO of the Canadian Vintners Association as well as the national association of the Canadian wine industry which represents wineries across Canada. At the workshop, he will address the current federal and provincial political context for direct-to-consumer issues, as well as identify points of momentum for eliminating inter-provincial trade barriers.
About our Keynote Speakers:
Mark Hicken
Mark Hicken, J.D. is a Vancouver lawyer providing a full range of legal services to the wine industry through his own law practice, Vintage Law Group. He is frequently quoted in the media on legal issues facing the wine industry and is a frequent speaker at wine industry conferences. Mark will offer a detailed review of federal and provincial direct-to-consumer wine shipping laws, including best practices and compliance obligations.


text:
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Busy day off.
Saturday, February 02, 2013
Was able to take today ff work. Another employee was willing to take my shift and I will use a vacation day for today. Was just a nice mental break from all the worry the past week with my mammograms and such. Got to spend the day with my husband which is always nice. I got up fairly early 7:30, for me on a day off. According to hubby he let me sleep in. We decided to get the ATV going and plowed out my mom, her neighbor and our driveway in about 30-40 minutes. I followed and pushed the light snow off the walks and steps.
Headed up to St. Cloud, about a 90 minute drive and checked out the Scheel's store and did a nice mall walk of 1.6 miles by covering the mall twice. Stopped at Cabela's and did some gun trading. I sold one of my .22 target rifles there. Was one that I had bought in the last year and it was a nice older rifle, but the trigger was not the best. It was a fairly cheap rifle, made for Montgomery Wards in the late 1930's. I had hoped it would be a nice vintage shooter, but compared to my other rifles, I was pretty disappointed. So decided to let it go. The rifle wasn't worth putting money into to try to make the trigger better.
Both Scheel's and Cabela's were a zoo in the gun dept. The place was packed with people buying guns before some politicians make it impossible or harder to buy them. So much for everyone wanting or needing more gun control. The present political atmosphere has only fueled more purchases and hoarding of gun related items.
We also decided to part with two of my acoustic guitars. I bought them since they were somewhat different, but made by the same company. One was made from spruce, and one was made from mahogany. They were Hagstrom guitars, and at the time, they didn't make many of this style of guitar. Somewhat collectable, but not really valuable. I only paid $125 and $129 for them. Put them on consignment at the music shop. Opens up two places on the wall now to put up two of our other guitars from floor stands. Slowly weaning down the guitar herd.
On our "road trip" today we discussed various things, one in particular was working hard this year to pay down/off some bills. Hence the decision to part with some items that really aren't being used or worth keeping around. It's a start in the right direction, not only work on physical fitness but financial fitness too.
So had a nice, relaxing day off. Will have my nose back to the grindstone on Sunday.
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text:
Interstellar Marines brings elite military training to your browser for the holidays — with real-life loot to be won
When: Wednesday, December 22nd 2010 to Monday, January 3rd 2011
Prize: Apple iPad 64 GB Wifi + 3g
In the spirit of the holiday season, Zero Point Software announces complete and free access to Running Man, the first prologue game to its forthcoming sci-fi shooter Interstellar Marines. A killer iPad prize is up for grabs for registered marines that successfully complete a day of training in Running Man, which you can play – conveniently – right inside your web browser.
Running Man takes you two kilometers below ground in a top secret military facility, where you will have to face an onslaught of Combat Training Robots in different environments. If you succeed you'll be one step closer to joining an elite squad of Interstellar Marines designed to be the first line of defense against new and hostile lifeforms.
How to enter:
Signing up is free and painless at interstellarmarines.com, the Interstellar Marines community site. Doing so will unlock full access (including all levels and saved progress) to Running Man. Simply complete one training day in Running Man to enter a holiday prize draw for a brand spanking new 64GB iPad. The qualified winner will be chosen at random and notified via email. Previously registered interstellarmarines.com users that complete Training Day 1 in Running Man are also eligible. For more information about the competition go to the Interstellar Marines website.
What is Interstellar Marines?
Interstellar Marines is the world's first truly independent AAA blockbuster game. The goal is to create a trilogy of games that can rival major blockbuster titles both in terms of graphics and gameplay. Interstellar Marines is being built with help from the community that directly supports development through investment in Spearhead or Frontline accounts, featuring perks such as early access to every new update from Interstellar Marines–including the highly-anticipated multiplayer mode–and a full digital copy of the Interstellar Marines trilogy when it's released. Perhaps the most important part of this equation: Our users get to have a say in the making of Interstellar Marines, every step of the way.
Gifts that keep on giving
As a part of the holiday cheer, new users will be able to pick up Spearhead and Frontline accounts discounted by 25% at the interstellarmarines.com shop from the 22nd of December to the 3rd of January. For our existing Spearheads and Frontliners, the most dedicated of fans, we've also prepared an exclusive Christmas mini-game.
We also invite new users to experience Interstellar Marines' previous playable releases, Bullseye and The Vault. Feel like testing your raw shooting skills against helpless synthetic cut-outs? Bullseye is the training facility for you; a veritable gauntlet of weapons target practice aboard the AIV Kitty Hawk. Meanwhile, The Vault provides an enticing fully-3D tour of environments and units from the ever-growing Interstellar Marines universe.
Play Interstellar Marines: Running Man here:
Interstellar Marines: Running Man release trailer:
"Merry Christmas from ZPS" – Video Log