Contact: Alex Plyukhin

Date: 03 May 2016 (Tuesday)

Speaker: Alex Plyukhin

Title: Stretched exponential relaxation in random walks with fractally correlated traps

Abstract: The stretched exponential relaxation function is ubiquitous in disordered and complex systems and, as currently known, may have different origins. One class of models is based on random walks with static traps, when the relaxation function has the meaning of the survival probability of the diffusing particle or random walker. I will briefly discuss a specific mechanism of stretched exponential relaxation for a random walk model with fractally correlated imperfect

Location: Goulet 3102. Time: 2.30 p.m.

Date: 22 March 2016 (Tuesday)

Speaker: Jason Hedetniemi (Clemson University)

Title: Domination in Graphs

Abstract: The "Domination Chain", a chain of inequalities involving six graph parameters, has been the focus of over a hundred research papers since its debut in 1978. The chain itself links three graph concepts: domination, independence, and irredundance. After introducing these three concepts, and the six parameters in the chain, we consider unique realizations of the parameters in an extremal graph setting.

Location: Goulet 3105. Time: 4.00 p.m.

Date: 25 February 2016 (Thursday)

Speaker: Dr. David Banach (Department of Philosophy, Saint Anselm College)

Title: The Multiverse, Anthropic Reasoning, and Scientific Explanation

Abstract: Some philosophers and scientists have argued that the very improbability of our being here, of the universe being constructed so as to allow the conditions for intelligent life, requires a special explanation, a God, or intelligent designer, behind the original conditions of the universe. Part of the impetus for such arguments comes from an awareness of how the development of the universe depends upon certain variables that are not derived from anything else, but which are traced back to certain original conditions within a primordial singularity or big bang. Beyond the limits of scientific observation, both science and religion may attempt to use probabilistic reasoning or mathematical speculation to answer the fundamental questions about the origin of the universe. I argue that beyond these limits the conditions for probable reasoning cannot apply, and that the conclusions of both the scientific and religious attempts to peer beyond the limits of science runs counter to the some of the fundamental motivations of both kinds of attempts to make sense of the universe.

Location: Goulet 2205 (Perini Hall). Time: 4.30 p.m.

Date: 17 March 2015

Speaker: Dr. Alex Plyukhin

Title: Three views on ENTROPY: Part 1-Thermodynamics

Abstract: Entropy is an important concept in many fields, and in each field it appears in a slightly (or not so slightly) different form. I would like to discuss the connection and differences between the definitions of entropy in thermodynamics, statistical mechanics, and the information theory. The thirst lecture will describe the origin - the emergence of the concept of entropy in thermodynamics, and its relation to other thermodynamics potentials. Although the story is old, the discussion is stimulated by recent important discoveries in non-equilibrium thermodynamics, information motors (aka Maxwell demons), and other fields.

Location: Goulet 2205. Time: 4 p.m.

Date: 03 February 2015

Speaker: Prof. Gheorghe M. Stefan (Politehnica University of Bucharest)

Title: Can Parallel Computing Be Liberated From Ad Hoc Solutions?

Abstract: In July 2010 David Patterson warned us that:

"the semiconductor industry threw the equivalent of a Hail Mary pass when it switched from making microprocessors run faster to putting more of them on a chip - doing so without any clear notion of how such devices would in general be programmed".

One-chip parallel computing seems to be in trouble, because it is based on ad hoc, artificial constructs which bring together, without any widely accepted theoretical foundation, more than one computational core. Can many cores provide more computation? Yes, but not in any conditions! We emphasize the weakness of the current approach in parallel computing and submit to your evaluation our view points about how parallel computing can emerge as an easy to use and efficient technology. It is about a five-step process focused on:

1. Mathematical model for parallel computing, to answer the question what means parallel computation

2. Abstract model for parallel computation, to answer the question how parallel computation works

3. Architectural model, to provide the interface between the hardware and software

4. Generic engine and programming environment design

5. Validation process based on the main computational motifs looping back to 3 (sometimes to 2).

Location: Goulet 2205 (Perini Hall). Time: 4 p.m.

Date: 03 November 2014

Speaker: Dr. David Banach (Saint Anselm College)

Title: Reason Persuades Necessity: Formal Causation and Prior Structural Constraint

Short abstract: We live in a world full of patterns. Waves, swarms, fields, configurations, clouds, and currents are all formal structures that subsist within collections of things. These types of patterns are stable, robust, and resist perturbations; they are the salient patterns that constitute our reality. They reveal a structural or mathematical constraint in the nature of the medium in which they exist, usually space and time. It is the pre-existing structure in space and time of fields and forces that constrains and is revealed in the patterns that emerge in the various sorts of symmetries and synchronizations that account for most of the stable entities in our world. I consider three kinds of examples: (1) Recent results in synchronizations of metronomes and the related synchronies in biological and neurological patterns; (2) Simple forms that arise in Moiré patterns from the movement of lines; and (3) Strange attractors in Chaos Theory. These mathematical forms of space and time represent a Reason that persuades Necessity, as Plato suggested, and governs the changes of the individual objects involved.

Full abstract

Location: Goulet 3100. Time: 4 p.m.

Date: 24 September 2014

Speaker: Dr. Ian Durham (Saint Anselm College)

Title: Particles, anti-particles, and reference frames

Abstract: Suppose there was a corner of the universe that consisted entirely of anti-matter. How could we interact with it given that matter and anti-matter can annihilate one another upon interacting? The answer to this question lies in the notion of a “quantum reference frame” and in one of the deepest symmetries in nature, the CPT symmetry (CPT stands for charge-parity-time reversal). In addition, it makes unambiguously clear what anti-matter actually is. I will frame the problem and present an overview of the solution in “flat” (Minkowski) spacetime.

Location: Goulet 2205 (Perini Hall). Time: 4 p.m.

Date: 28 March 2014

Speaker: Dr. Alex Plyukhin (Saint Anselm College)

Title: Mathematical Models of Molecular Motors

Abstract: Molecular motors are mesoscopic active systems which can propel themselves in noisy environment by converting chemical energy into mechanical work. Such motors are ubiquitous in biological world, pumping ions across the cell membrane and facilitating many vital intracellular transport processes. In recent years, natural biological motors inspired researchers to design artificial nanoscaled motors which may have stupendous potential applications, for instance as drug delivery vehicles. Simple mathematical models of self-propulsion of active Brownian objects will be discussed in which the role of the environmental noise is non-trivial and essential.

Location: Goulet 3103. Time: 4 p.m.

Date: 4 December 2013

Speaker: Dr. Alex Plyukhin (Saint Anselm College)

Title: Special Relativity: Express Introduction and Slightly Beyond

Abstract: The purpose of this talk is twofold. The first goal is pedagogical: I will introduce the basic results of Einstein's special relativity theory in a way which I believe is more concise and direct than any other. The second goal is to present our new results on relativistic Brownian dynamics.

Location: Goulet 3101. Time: 4 p.m.

Date: TBA

Speaker: Dr. Gregory Buck (Saint Anselm College)

Title: Self-Induced Motion of Filaments

Abstract: Filaments are ubiquitous - they appear on every scale studied by science. We present a new equation for the self-induced motion of an attractive or repelling filament or filamentary distribution of matter. The equation applies to filaments of any reasonable shape and mass or charge density and allows us to solve several natural problems. Applications could include celestial distributions such as spiral arms of galaxies, the biofilaments DNA and proteins, and carbon nanotubes.

Location: Goulet 3103. Time: 4 p.m.

31 January 2013

Speaker: Dr. Peter Golubtsov (Moscow State University)

Title: Game-Theoretic Effects in Economy: How Good is Competition?

Abstract: We all know that competition is good for consumers, but not as good for competing firms. But is it always as simple? To examine this phenomenon we will start with a simple example of competition and design the corresponding model "from scratch." We will see that what we designed is a game. Then we will introduce some basic notions of Game theory, analyze our game and confirm that the stronger competition is, the better for consumers. However, since our first model would be too primitive, we will make it more realistic and exciting by allowing it to "live", i.e. by adding dynamics. How would our system behave in the long term? Would consumers still benefit from competition? I will try to address these questions in my talk.

Location: Goulet 3103; Time: 4.00 p.m.

13 November 2012

Speaker: Dr. Susan D’Agostino (Southern New Hampshire University)

Title: Linear Algebra: The Secret of Google’s Success

Abstract: Over the years, world wide web surfers have been presented with various search engines, including Archie, Yahoo!, Altavista, Ask Jeeves and, of course, Google. The goal of all of these search engines has been to provide a ranked list of relevant, reputable results based on the search words. In this talk, we will discuss the linear algebra behind what is arguably a very successful search engine: Google. At the heart of Google’s PageRank algorithm lies one colossal eigenvector that, one could argue, is the secret of Google’s success. This talk will be accessible to undergraduate students; prior knowledge of linear algebra is not necessary.

Location: Goulet 3103; Time: 4.00 p.m.

2 October 2012

Speaker: Andrew Lazowski (Sacred Heart University, Mathematics)

Title: A Hyperbolic Baseball Field and Unusual Dimensions

Abstract: This will be an introduction to hyperbolic geometry. We will introduce hyperbolic space, discuss differences from Euclidean geometry, and then discover how big a hyperbolic baseball field is. In addition, we will answer the question of what makes hyperbolic geometry so important. Lastly, we will discuss dimensions of spaces which leads to good research questions.

Location: Goulet 3103; Time: 4.00 p.m.

27 September 2012

Speaker: Alex Plyukhin (Saint Anselm, Mathematics)

Title: Two microscopic models of Langevin dynamics

Abstract: The Langevin equation, initially suggested to describe Brownian motion, provides an important, general, and relatively simple approach to describe an extremely broad class of phenomena in open systems ranging from quantum decoherence to dynamics of stellar systems. The main idea is that in most cases of interest one does not need to know exact internal forces but only their statistical properties, and the average friction they produce. In this talk I will show that there is a class of models which lead - somewhat unexpectedly - to the same value of the friction coefficient even though their statistical characteristics are different.

Location: Goulet 3103; Time: 4.00 p.m.

06 December 2011

Speaker: Ian Durham (Saint Anselm)

Title: Time, Entropy, and Information: What everyone should know about probability and statistics but probably doesn't

Abstract: 1% of women over the age of 40 who participate in routine screening have breast cancer. 80% of women with breast cancer will get positive mammographies. 9.6% of women without breast cancer also get positive mammographies. Given this information, if a woman over 40 gets a mammogram that comes back positive for breast cancer, what is the likelihood that she actually has cancer? Most doctors ­ almost 85% of them, in fact ­ get the answer to this question wrong. If you want to know why ­ and if you want to know what probability theory really is ­ then come to my talk.

Location: Goulet 3104; Time: 4.00 p.m.

01 November 2011

Speaker: Stephen Shea (Saint Anselm)

Title: Probability as you’ve probably never seen it before

Abstract: How do people think about chance in everyday life? What are the most common queries to search engines containing the phrase “probability of” or “chance of”? Did you know that there is a casino betting strategy where you will leave with more money than you came in with 99% of the time? We’ll discuss these and other (hopefully entertaining) topics in probability.

Location: Goulet 3100; Time: 4.00 p.m.

04 October 2011

Speaker: Stephen Shea (Saint Anselm)



Location: Goulet 3104; Time: 4.00 p.m.

3 May 2011

Senior math students presentations:

Pat Corbet, NBA road games comparison
Ryan J. Henry, Pressure the ball! A study on playing surfaces and their effects on game play
Andrew Matthews, Molecular dynamics: basic outline and example
Andrew Ross, Computational analysis of laser modes in a hollow, cylindrically symmetric waveguide
Cameron S. Ross, Baseball analysis: 2004 American League championship series
Pamela Scott, How connected are the seniors of Saint Anselm College on Facebook?
Meaghan Sullivan, The importance of the problem solving process in education: A look at how card tricks can foster learning

Location: Goulet 3104; Time: 4.00 p.m.

22 February 2011

Speaker: Barry Sanders (iCORE Chair of Quantum Information Science, University of Calgary)

Title: Whither quantum computing?

Abstract: A quantum computer could be amazing but faces two obstacles: how do we build it and what do we do with it? I discuss and partially answer these questions.

Location: Perini Lecture Hall (Goulet 2205); Time: 3.30 p.m.

25 January 2011

Speaker: Andrew Ross (Saint Anselm)

Title: First-principles investigation of graphene-metal interfaces

Abstract: Epitaxial growth of graphene on Ni(111) substrates is one promising method of large-scale, high-quality graphene wafer production, due to the small lattice mismatch between these two materials. We present results of first-principles density functional theory (DFT) investigation of the structural, electronic, and magnetic properties of graphene/Ni(111) interfaces relevant to experimental studies of graphene growth on nickel substrates. DFT calculations were performed to identify the favored interface geometries and binding sites for different interface configurations. Additional adlayers of Ni and Cu were either adsorbed on top of the graphene/metal interface, or placed between the graphene and substrate to model processes of metal intercalation. It was also found that the interaction between graphene/Ni(111) and the top Cu adlayer is much weaker compared to that for Ni adlayer. The atomic, electronic, and magnetic properties of these interfaces, including induced magnetic moments in graphene/Ni(111) and Cu,Ni/graphene/Ni(111) systems are also discussed.

Location: 3104 Goulet; Time: 4.30 p.m.

15 April 2010

Speakers: David Guerra and Jeffrey Schnick (Saint Anselm, Physics)

Title: Analysis of the Motion of a Bouncing Ball

Abstract: A ball mounted on one end of a slender ten-inch rod, rests on a horizontal disk. The ball is positioned near the perimeter of the disk and other end of the rod is raised and connected to a fixed pivot. Using a motor to spin the disk at a fixed rate results in spontaneous bouncing of the ball. Data of the ball’s motion was acquired and will be presented along with basic analysis of the data. In addition, models of the system and the preliminary results of the models will be presented.

Location: 3104 Goulet; Time: 4.30 p.m.

11 March 2010

Speaker: George Parodi (Saint Anselm, Chemistry)

Title: Can a Chemist Make Molecules Hum? Or Photoacoustic Spectroscopy and Pollen Identification

Abstract: In the late 19th century Alexander Graham Bell discovered the optoacoustic effect. For almost a century it found little practical use, but in the early 1970’s the effect was applied to measure the spectra of samples not amenable to usual methods. In this talk, after a brief review of conventional absorption spectroscopy, the optoacoustic (photoacoustic) effect and its application to the measurement of infrared spectra of pollens will be described. Some preliminary statistical analysis of data collected in our laboratory will be (briefly) described.

Location: 3104 Goulet; Time: 4.30 p.m.