The Department of Physics invites you to attend a Research Seminar by LU-TBRHRI Research Chair in Biophysics candidate:

DR. OLEKSII SEMENIUK
^{Postdoctoral Researcher
Medical Physics Department of Nova Scotia Health Authority}

"Advanced photoconductors for radiation medical
imaging detectors"

Friday, July 27, 2018
at 1:00 p.m. in AT2020

Abstract:

Solid state X-ray detectors play an essential role in a variety of applications, ranging from domestic security and astronomy to nuclear research and medical imaging. While the radiation sensing technology has made significant progress over the last decade, the “heart” of the detector (i.e. radiation sensing medium) has experienced only modest changes. Indeed, commercially available large area direct and indirect-conversion detectors are traditionally based on layers of amorphous selenium (a-Se) and cesium iodide (CsI), respectively. Nowadays, the performance of these materials has probably reached its full potential, despite the critical need for further improvement in terms of X-ray dose used and image quality. This is of particular importance for diagnostic medical imaging where performance of medical imaging devices defines the ability to detect and diagnose medical conditions accurately and at the earliest stage of disease. The goal of my work is to develop and characterize the next generation of customized X-ray photoconductors to address these issues. My talk will be focused on the most promising novel materials, namely amorphous lead oxide (a-PbO) and cesium lead bromide (CsPbBr₃) which uniquely allow to reduce the dose associated with X-ray imaging, while improving the diagnostic capabilities and lowering detector costs.

Bio:

Dr. Oleksii Semeniuk is working as a postdoctoral researcher at the Medical Physics department of Nova Scotia Health Authority. The topic of his current research is development and characterization of a real-time monitoring system for cranial stereotactic radiosurgery. Oleksii completed his MSc and PhD at Lakehead University and his undergraduate at National Aviation University, Ukraine. His research interests lie in the area of radiation dose reduction for medical imaging applications. Particular, Oleksii is working on performance optimization of advanced X-ray photoconductors for utilization as X-ray-to-charge transducers in direct conversion detectors for fluoroscopy and general radiography.

The Department of Physics invites you to attend a
thesis defense presented by:

ALEX CLESIO NUNES MARTINS
_entitled
"Correspondence Rules in SU(3)"

Friday, September 14, 2018
1:30 p.m. in CB 4058

 
The Department of Physics
invites you to attend a seminar presented by:

Dr. Margaret Hawton
_{Professor Emeritus, Physics Dept., LU}

Dr. Vincent Debierre
^{Max Planck Institute for Nuclear Physics, Heidelberg}

^entitled:
  "Maxwell Quantum Mechanics"

Friday, October 26, 2018
 at 3:30 pm
in CB 4058

The Department of Physics invites you to attend
a seminar presented by:

DR. WERDEN J. KEELER
Professor Emeritus, Physics Dept., LU

entitled:

"High Performance Double-Confocal Micro-Raman System and Applications"

Friday, November 9, 2018  
at 3:30 pm in CB 4058

Abstract:  This is a report on the development of a high-brightness confocal micro-Raman system assembled from components found in most optics labs or readily available from various suppliers.  An assembly approach can reduce system cost significantly if the major components are already at hand.

Further, we show how a second confocal pinhole and two in-line Rayleigh rejection filters can improve overall signal-to-noise and low wavenumber signal recovery, with only minimal reduction in throughput to the detector.

Finally, we demonstrate the system performance using a series of `straight-forward' and `more challenging' sample types.

The Department of Physics invites you to attend a research proposal presentation by: 

JUSTIN STILES
"Evaluation of Solid-State Technology for Positron Emission Mammography Imaging"

^{Supervisor: Dr. A. Reznik} 

Abstract: To address unmet patient needs in breast cancer screening and conform with the trends of personalized medicine, we designed and developed an organ specific Positron Emission Tomography (PET) system called Positron Emission Mammography (PEM). The developed PEM detector technology is based on novel high-gain solid-state Silicon Photo-multipliers (SiPMs) operating in Geiger-mode. The goal of this research is to characterize the performance of our newly developed PEM detectors by conducting a series of standardized tests that are aligned with the recommendations of the National Electrical Manufacturers Association (NEMA) guidelines. Reporting the values for Loss, Count Rate, Sensitivity, and Spatial Resolution of Si-PM’s in this configuration will be the final goal of this work.

Thursday, AUGUST 22, 2019 
1:00 pm in ATAC 1005

The Department of Physics invites you to attend research proposal presentations by: 

NAVNEET KAUR
"Raman Probe for the Detection of Chemicals"

^{Supervisor: Dr. G. Das} 

ABSTRACT: A fiber-based Nanoprobe has been prepared for the detection of chemicals at the molecular level using Surface Enhanced Raman Spectroscopy (SERS). We deposited gold nanorods on the surface of a multimode tapered fiber via optical tweezing to obtain the SERS substrate. The process of optical tweezing can be used to trap and manipulate the distribution of the metallic particles. We will present the theoretical and experimental results of our investigations.

 ^{Thursday, August 15th
2:00 pm in CB 3031}

DAVIDE MARCHESE

"Adsorption of 2-D Halogenated Organic Molecules on the Si(111)-B(√3x√3) R30^o Surface"

^{Supervisor: Dr. M. Gallagher}

Abstract: This project seeks to investigate the self-organization of two-dimensional halogenated organic  molecules on the (111) surface of boron doped silicon. In particular, the research goal is to determine if Si(111)-B(√3x√3) R30^owill support the surface-confined self-organization of halogenated monomers into organized networks. The self-assembly and subsequent two-dimensional polymerization will be investigated. The primary experimental technique will be scanning tunneling microscopy. However, other surface techniques such as low energy electron diffraction, Auger electron spectroscopy and X-ray photoelectron spectroscopy may also be employed.

_{Thursday, August 15th
 3:00 p.m. in CB 3031}

The Department of Physics invites you to attend
STUDENT POSTER PRESENTATIONS:

Hunter Harris and Ari Boon
“The bouncing ball”

David Ricci and Tristen Thibault
“The restricted 3-body problem”

Max Yuan and Isaac Westerback
“The Lorenz equation”

Brandon Delin and Frank Hawkins
“The Henon-Heiles potential”

Hanna Dahl and Paul Zebarth
“The Toda lattice”

FRIDAY, NOVEMBER 30th from 9:30am to 11:30am
in LI5002
^{_{(coffee and cookies provided)}}

The Department of Physics invites you to attend a Research Seminar in Biophysics:

DR. CRISTIANO L. DIAS
_{Assistant Professor, Department of Physics
New Jersey Institute of Technology (NJIT)}

"Computer simulation of the amyloid-beta protein associated with Alzheimer's disease"

_{Bio: Cristiano Dias is an Assistant Professor in the Department of Physics at the New Jersey Institute of Technology(NJIT).  He earned a PhD degree in Physics from McGill University and he has post-doctoral training from University of Toronto (in Biochemistry), Western University (in Applied Mathematics), and Freie Universitat Berlin (in Physics).  His research interests are in computational biophysics and they lie at the interface of Chemistry, Biology, and Physics. His group develops and uses multiscale models that can bridge atomistic and mesoscopic length scales to provide abetter understanding of biological systems.}

_{[1] Klunk, William E.,et al. Imaging brain amyloid in Alzheimer's disease with Pittsburgh Compound- B. Annals  of  Neurology:Official Journal of  the American Neurological  Association and the Child Neurology Society 55, 306(2004).}

_{[2]ZhaoqianSu, FarbodMahmoudinobar,and Cristiano Dias, Role of TMAO on the conformation ofpeptides and its implication for proteins, Phys. Rev.Letters 119, 108102(2017)}

THE DEPARTMENT OF PHYSICS
presents the
CANADIAN ASSOCIATION OF PHYSICISTS (CAP)
LECTURE TOUR

Guest Speaker:
DR. PIERRE GOREL
_{Research Scientist, SNOLAB}

"Digging into Mysteries:  the Search for Dark Matter at SNOLAB "

_{click here for poster and abstract details}
Tuesday, MARCH 6^th, 2018
10:00 am
in RB 2042

_Abstract:

Our understanding of the laws of physics has been going by leaps and bonds in the last century. The Standard Model of Particle Physics has been very successful, culminating with the discovery of the previously predicted Higgs boson. And yet… it is enough to look up and survey the sky to discover that this great achievement explains less than 5% of the Universe. Many clues point to the existence of five times more matter with no electromagnetic interaction, making it impossible to observe except for its effect on the gravity field. The most favored candidates for this “dark matter” are the Weakly Interacting Massive Particles (WIMPs). They would scatter off nuclei, producing detectable recoils. Over the last decades, a word-wide effort has taken to look for these particles, which have managed so far to stay elusive. As a results, the detectors have become bigger and bigger, reaching new levels of sensitivity. The corollary is that the “low background” requirement inherent to this kind of detector became more and more stringent, forcing experiment to be built with the thickest overburden possible to be protected against cosmic rays. In this landscape, SNOLAB is one of the best laboratories in the world. With more than 2 km of rock overburden in the heart of the Canadian Shield, the facility has been built on the success of the SNO experiment (Nobel prize cowinner 2015) and is dedicated to low background research. With 6 projects at various stages of readiness and operation, direct dark matter search occupies a place of choice in the physics program of SNOLAB, next to neutrino detection and biology. In this talk, I will discuss the recent results published by three of them.

_{Short bio:}

^{Dr. Pierre Gorel graduated in 2002 from the Ecole Nationale Superieure d’Ingenieur de Caen (France) with a specialization in nuclear instrumentation and worked on ECR ion sources at the Grand Accelerateur National d’Ions Lourds (Caen, France). In 2006, he completed a PhD on the Search for T-violation in the decay of the free neutron at the Paul Sherrer Institut (Villigen, Switzerland) and the University of Caen. He then moved to astroparticle physics as a research associate at the University of Alberta. After a short stint on the neutrinoless double beta decay with the SNO+ collaboration, he focused his work on the direct search for dark matter by joining the DEAP project and leading several aspects of the DEAP-3600 detector construction. He is currently a research scientist at SNOLAB (Sudbury, Canada) and involved in the analysis of the DEAP data as well as the construction of the NEWS-G dark matter detector at SNOLAB.}

The Department of Physics invites you to attend a
thesis defense presented by:

PAVLO KARAYSUK
_entitled
"Characterization of CdZnTe semiconductor for applications
in advanced computed tomography"

Tuesday, January 16, 2018
9:00 a.m.
in CB 4058