A5085531464- Advanced Radiotherapy Techniques
- Microfluidic and Capillary Electrophoresis Applications
- Radiation Therapy and Dosimetry
- Nanopore and Nanochannel Transport Studies
- Radiation Dose and Imaging
- Radiation Detection and Scintillator Technologies
- Electrostatics and Colloid Interactions
- Microfluidic and Bio-sensing Technologies
- Advanced X-ray and CT Imaging
- Force Microscopy Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Physics and Applications
- Neuroscience and Neural Engineering
- Innovative Microfluidic and Catalytic Techniques Innovation
- Radiation Shielding Materials Analysis
- Spectroscopy and Quantum Chemical Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Fluid Dynamics and Turbulent Flows
- Polymer crystallization and properties
- Radioactive Decay and Measurement Techniques
- Rheology and Fluid Dynamics Studies
- Medical Imaging Techniques and Applications
- Radiation Effects and Dosimetry
- Radioactivity and Radon Measurements
- Radiation Effects in Electronics
National Research Council Canada
2010-2023
Université Laval
2016-2017
National Academies of Sciences, Engineering, and Medicine
2011-2014
Washington and Lee University
2009-2012
University of Ottawa
2000-2009
The purpose of this study was to derive a complete set correction and perturbation factors for output (OF) dose profiles. Modern small field detectors were investigated including plastic scintillator (Exradin W1, SI), liquid ionization chamber (microLion 31018, PTW), an unshielded diode D1V, SI) synthetic diamond (microDiamond 60019, PTW). A Monte Carlo (MC) beam model commissioned use in fields following two commissioning procedures: (1) using intermediate moderately (down 2 × cm2) (2) only...
Purpose: To measure the attenuation effectiveness and minimize weight of new non-Pb radiation shielding materials used for protection by interventional radiology (IR) physicians, to compare accuracy different standard measurement geometries these materials, determine x-ray qualities that correspond scattered IR physicians typically encounter. Methods: Radiation capabilities were investigated. Typically, most studies have focused on attenuating properties metal powders. In this study, layers...
We use a bond-fluctuation Monte Carlo method to study the motion of long polyelectrolytes inside an array microscopic entropic traps. The molecules are pulled through by electric field and forced into submolecular-size constrictions between larger trap regions. numerically solve Laplace equation structure obtain realistic lines for our simulations. find that mobility increases with molecular size size-separation mechanism relies mainly on overall deformation as they approach narrow...
Purpose Determine the effective point of measurement (EPOM) 12 thimble ion chambers, including miniature chambers and three models widely used for clinical reference dosimetry. The EPOM is at which measured dose would arise in medium absence probe: For cylindrical it shifted upstream relative to central axis chamber. Although current dosimetry protocols prescribe a blanket shift , with as chamber cavity radius, has been shown recent years that does, fact, depend on every detail design beam...
We report on coarse-grained molecular dynamics simulations of the electroosmotic flow (EOF) an electrolyte confined in a cylindrical, nanoscopic pore. present results for equilibrium distribution fluid particles and ions electrolyte, we show that our computational model reproduces well-known characteristics EOF steady-state regime, particular pluglike character this type when Debye length is small compared to characteristic channel size. Upon adding number neutral, grafted polymer chains...
A new deformable geometry class for the VMC++ Monte Carlo code was implemented based on voxel warping method. Alternative geometries which use tetrahedral sub-elements were and efficiency improvements investigated. energy mapping method, calculating volume overlap between deformed reference dose grid target grid, also developed. Dose calculations using both methods compared in simple phantoms as well a patient geometry. The implementation increased calculation times by approximately factor...
The Poisson-Boltzmann equation (PBE) is widely employed in fields where the thermal motion of free ions relevant, particular situations involving electrolytes vicinity charged surfaces. applications this non-linear differential usually concern open systems (in osmotic equilibrium with an electrolyte reservoir, a semi-grand canonical ensemble), while solutions for closed (where number fixed, ensemble) are either not appropriately distinguished from former or dismissed as numerical calculation...
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTControl and Quenching of Electroosmotic Flow with End-Grafted Polymer ChainsFrédéric Tessier Gary W. SlaterView Author Information Department Physics, University Ottawa, 150 Louis-Pasteur, Ontario, Canada K4A 2E7 Cite this: Macromolecules 2005, 38, 16, 6752–6754Publication Date (Web):July 9, 2005Publication History Received20 April 2005Revised21 June 2005Published online9 July inissue 1 August...
To calculate the kQmsr,Q0fmsr,fref factors for nine common ionization chamber types following small fields dosimetry formalism calibration of Leksell Gamma Knife® (LGK) PerfexionTM using Monte Carlo simulation. This study also provides first independent comparison EGSnrc and PENELOPE calculation correction proposes a practical method to predict these based on type, orientation phantom electron density.The chambers are modeled codes blueprints provided by manufacturers. The placed in...
In this paper, we present a new modular lab on chip design for multimodal neurotransmitter (NT) sensing and niosome generation based plug-and-play concept. This architecture is first step toward an automated platform modulation of concentration to understand and/or treat neurodegenerative diseases. A approach has been adopted in order handle measurement or drug delivery both simultaneously. The system composed three fully independent modules: three-channel peristaltic micropumping system,...
In this article, we examine the low-field electrophoretic migration of infinitely small analytes in dilute sieving media made nonconducting gel fibers. Using an Ogston obstruction model, show that mobility is not affected by presence curved field lines. other words, Nernst-Einstein relation between and diffusion coefficient valid regardless electrical properties Although finding may greatly simplify development models sieving, it also represents a critical test for any analytical or...
Although several studies provide data for reference dosimetry, the SNC600c and SNC125c ionization chambers (Sun Nuclear Corporation, Melbourne, FL) are in clinical use worldwide which no beam quality correction factors kQ available. The goal of this study was to calculate these according dosimetry protocols TG-51, TRS 398 DIN 6800-2.Monte Carlo simulations using EGSnrc have been performed absorbed dose water air within active volume chamber models. Both spectra transport through linear...
Abstract #From the forthcoming book, Soft Materials: Structure, and Dynamics, Marangoni, A. G. Dutcher, J., Eds., Marcel Dekker, Inc., in press. Notes
Abstract We review the basic theory for static and dynamic properties of ideal real chains. describe stretching single chains in both strain stress ensembles, give scaling arguments deformation chains, also consider impact chain rigidity by discussing worm-like complement this theoretical outlook with specific examples that highlight relevance single-molecule a practical perspective: translocation macromolecule over potential barrier, collision fixed obstacles or other dynamics thethered...
The elastic properties of planar, ${C}_{4}$-symmetric networks under stress and at nonzero temperature are determined by simulation mean field approximations. Attached fourfold coordinated junction vertices, the self-avoiding in that their elements (or bonds) may not intersect each other. Two different models considered for potential energy elements: either Hooke's law springs or flexible tethers (square well potential). For certain ranges temperature, captured one several models: large...