Department Seminar Series

Room N1046 - Science Building, Wilfrid Laurier University

The Department of Physics & Computer Science at Wilfrid Laurier University presents a monthly seminar series. The talks are held every second Tuesday of the month at 4:00 p.m. and are aimed at fostering thought-provoking interactions among students, staff and faculty from WLU and other institutions. Everyone is welcome!

For further information about the seminars or if you are interested in giving a talk, please contact Ilias Kotsireas (ikotsireas@wlu.ca) or Marek Wartak (mwartak@wlu.ca).


Friday, November 10, 2017 2:30 pm: N1044

Smartphones Enable Smart Cities

Dr. Petros Spachos - School of Engineering - Director, GryPHone Lab - University of Guelph

smart_city (60K)

The expanding capabilities and growing number of smartphone devices are producing a new computing infrastructure integrating smart phones, users and sensors. User expect their phones to locate their social network friends; turn on the lights of the living room; report the temperature in their car; provide instant access to video and music and communicate with all the other wireless enable devices in the area - all in addition to placing phone calls and sending text messages. I will give an overview of the research activities at GryPHone Lab, the open-access smartphone testbed at the University of Guelph. GryPHoneLab is designed to enable mobile systems research that cannot be done in any other way.

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Past Seminars


Monday, October 30, 2017, 2:30 pm: CC-101, Career Center, (King and Lodge)

Mathematical Tracing of Protein Misfolding

Prof. Takis Vlamos - Ionian University, Greece - Director, BiHELab, Bioinformatics and Human Electrophysiology Lab

folding (93K)

The classification of various autoimmune diseases according to the misfolding of specific proteins is following the existing proof of their connection. Yet, the misfolding is not being modeled according to geometry but according to the problems arised by the energy flows. The proteins can be unfolded with a parallel production and measurement of approximately 80.000 energy steady states and could be compared with unfolded well operating proteins. The definition of a much smaller length of a protein which may contain the misfolding is crucial for transforming research-oriented patterns to diagnostic tools. Creating new isomorphic representations of the mathematical modeling of the energy form of proteins can provide us with matching criteria for the tracing of protein misfolding in much smaller scales.

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Tuesday, June 28, 2016 4:00 pm: N1044

A Biased Overview of a Power-Law Entropy

Professor N. Kalogeropoulos - Weill Cornell Medicine - Qatar

entropy (51K)

The Havrda-Charvat / Daroczy / Lindhard-Nielsen / Cressie-Read / Tsallis entropic functional has attracted some attention during the last 25 years. Professor N. Kalogeropoulos will present a biased overview of this functional, having in mind its potential applicability in the statistical physics of particles and fields.

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Tuesday, March 22, 2016 4:00 pm: N1057

Gravitational Waves and General Relativity for All: No Physics Background Required

Dr. Shohini Ghose - Wilfrid Laurier University

ligo_small (131K)

In September 2015, one of the most precise measurements in history told us about one of the most powerful events in the universe: the collision of two black holes that produced gravitational waves over a billion years ago. But what are gravitational waves and why should we care? This talk will explain the beautiful conceptual simplicity of Einstein's theory of General Relativity, his prediction of gravitational waves, and how this discovery can change our understanding of the universe. No prior knowledge of physics is required. Bring your curiosity.

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Tuesday, March 8, 2016 5:00 pm: BA209

Do Billionaires Compute Eigenvalues? 20 Years of Google's PageRank Saga

Dr. Ilias Kotsireas - Wilfrid Laurier University

Google Logo

A significant part of Google's early success in the realm of search engines is attributed to the PageRank algorithm, invented 20 years ago. We will explain the concepts behind the PageRank algorithm, that are necessary to gain a thorough understanding of its inner workings, including how to build the corresponding Google matrix. We will illustrate the execution of the PageRank algorithm with an example. Then we will describe how the ranking of websites in Google's search engine arises.

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Tuesday, November 10, 2015 4:00 pm

Semiconductor Epitaxy: driving fundamental discoveries and innovative applications

Dr. Zbig Wasilewski - University of Waterloo

seminconductor (146K)

Semiconductor research has been one of the most influential driving forces behind pure and applied science for more than half a century. Studies of the elementary and collective excitations, or quasiparticles, in semiconductor-based man-made artificial universes and nanostructures are now one of the hottest research areas in physics. The fruits of the semiconductor science and technology have profound influence on everything from individual lifestyles to the entire civilizations which are increasingly dependent on fiberoptic world-wide web highways, smartphones, personal computers, digital cameras, medical diagnostic instruments, photonic, electronic and magnetic sensors, ultra-bright LEDs, LED flat-panel displays and TVs, and solar-panel power stations, to mention just a few. None of that would have come into existence if it were not for the continuing progress in the material science, and in particular advancements in the epitaxial technologies. This seminar will discuss the principles behind semiconductor epitaxy and give a condensed overview of the current state-of-the art.

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Tuesday, October 20, 2015 4:00 pm

Femtomedicine in Cancer: Discovery of New Antitumor Molecules for Natural Targeted Chemotherapy and Radiotherapy of Cancers

Dr. Qing-Bin Lu - University of Waterloo

dna (147K)

The conquest of cancer continues to pose great challenges to medical science. There is a compelling need for innovative cancer research integrating biomedical sciences with physical sciences in order to ultimately conquer cancer. Femtosecond (fs) (1fs=10 15 s) time-resolved laser spectroscopy (fs-TRLS) is a direct technique to visualize molecular reactions in real time1. Femtomedicine (FMD), which fuses fs-TRLS with biomedical sciences, was recently coined to advance fundamental understanding and therapies of human diseases notably cancer.

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Tuesday, September 8, 2015 4:00 pm

Constructing the Shadow Geometry of the New W(23,16)

Dr. Giora Dula - Netanya College, Israel

A weighting matrix of length n and weight k denoted W(n,k) is an orthogonal {0;±1} matrix with rows of length \(\sqrt{k}\). I would like to report on a new weighting matrix W(23,16), the smallest pair of numbers where the existense of the weighting matrix is currently not known. I will survey the details of the paper by the authors. This matrix was found in two stages: the one called finding the geometry which is equivalent to finding W modulu 2, and the whole matrix from the geometry called colouring. In this note we concentrate on the geometry stage.

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Tuesday, May 12, 2015 4:00 pm

How a Physicist Simulates Twitter

Dr. Isaac Tamblyn - University of Ontario Institute of Technology

In less than a decade, online social networks such as Twitter and Facebook have dramatically changed how communities and individuals share information. Such networks provide the platform for highly intellectual debates such as the colour of the dress (it is clearly white and gold), rapidly spreading information about natural disasters and missing persons, to darker uses such as the ubiquitous monitoring and profiling of online user discussions, enabling online abuse, and spreading the propaganda of repressive regimes. In this presentation, I will discuss how (and why) a Physicist approaches developing a computational model of a social network.

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Tuesday, April 21, 2015 4:00 pm

Tiny and More Precious: Silver and Gold at Nanoscale - Size and Shape Control, Plasmonic Nanoparticles, and "Superatoms"

Prof. Vladimir Kitaev - Wilfrid Laurier University

Matter confined to nanoscale dimensions displays striking and unusual properties. Noble metals feature required stability for comfortable nanoscale fabrication through chemical synthesis. Free electrons of metals give rise to surface plasmon resonance (SPR) that is ultimately tuneable through size and shape control. Upon strong quantum confinement (< 2nm), metal nanostructures display discrete electronic transitions and behave like "superatoms" that feature a lot of similarities with quantum dots.


Tuesday, March 10, 2015 4:00 pm

The Secrets of Gravity

Dr. Paul McGrath - Wilfrid Laurier University

A century ago, Einstein revolutionized our understanding of the universe with his new theory of gravity and spacetime. Since then, fantastic ideas like the Big Bang, dark energy, and the existence of blackholes have been revealed. In this talk, I will explore the puzzle pieces that Einstein put together to discover this new theory and explain how exactly it changed our picture of the universe bringing us to our present day understanding. However, the journey will not stop there. I believe that Einstein's theory is still holding on to a very important secret about the inner workings of nature - a secret which we will need to carefully decipher the meaning of if we ever wish to construct a theory of everything.

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Tuesday, February 10, 2015 4:00 pm

Metamaterials

Dr. Marek Wartak - Wilfrid Laurier University

Metamaterials are man-made structures possessing predefined electromagnetic properties. These artificial, engineered media have been under development for about 15 years now. They are composed of sub-wavelength features (meta-atoms), which through their interaction with light lead to unusual optical properties, such as a negative (effective) refractive index. Metamaterials having simultaneously negative electric permittivity and magnetic permeability, which leads to a negative refractive index, have been experimentally constructed, tested and found to be in agreement with theory in frequency regions from the radio all the way to the optical regime. Here, we review the basic premises of these media and the routes that are usually followed towards constructing them. In particular, we explain in some detail how one can create a medium possessing negative permittivity and/or negative permeability. Further, we discuss in some detail applications of those materials and current trends in their fabrications using chemical methods.

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Tuesday, January 13, 2015, 4:00 pm

Surface of Mars

Perturbations of Low Orbiters in a Dusty Martian Atmosphere

Dr. John Haranas - Wilfrid Laurier University

We calculate the effect of atmospheric dust on the orbital elements of a satellite. Dust storms that originate in the Martian surface may evolve into global storms in the atmosphere that can last for months can affect low orbiter and lander missions. We model the dust as a velocity-square depended drag force acting on a satellite and we derive an appropriate disturbing function that accounts for the effect of dust on the orbit, using a Lagrangean formulation. A first-order perturbation solution of Lagrange's planetary equations of motion indicates that for a local dust storm cloud that has a possible density of 8.323.10-10 kg m-3 at an altitude of 100 km affects the orbital semimajor axis of a 1000 kg satellite up -0.142 m day-1. Regional dust storms of the same density may affect the semimajor axis up to of -0.418 m day-1. Other orbital elements are also affected but to a lesser extent.

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