A5060121984- Spectroscopy Techniques in Biomedical and Chemical Research
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Spectroscopy and Chemometric Analyses
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Optical Imaging and Spectroscopy Techniques
- Photoacoustic and Ultrasonic Imaging
- Advanced Fluorescence Microscopy Techniques
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Ocular and Laser Science Research
- GNSS positioning and interference
- Astrophysics and Cosmic Phenomena
- Heat shock proteins research
- High-pressure geophysics and materials
- Advanced Optical Sensing Technologies
- Cell Image Analysis Techniques
- Optical Coherence Tomography Applications
- Laser Design and Applications
- Gamma-ray bursts and supernovae
Université Laval
2008-2014
Institut Universitaire en Santé Mentale de Québec
2014
University of British Columbia
2006-2011
Genia Photonics (Canada)
2011
Motivated by the recent discovery of 30 new millisecond pulsars in Terzan 5, made using Green Bank Telescope's S-band receiver and Pulsar Spigot spectrometer, we have set out to use same observing system a systematic search for other globular clusters. Here report on five NGC 6440 three 6441; each cluster previously had one known pulsar. Using most distance estimates these clusters, conclude that there are as many potentially observable 6441 5. We present timing solutions all Four...
We present a wavelength-swept coherent anti-Stokes Raman scattering (WS-CARS) spectroscopy system for hyperspectral imaging in thick tissue. use strategy where the lines are excited sequentially, circumventing need spectrometer. This fibre laser system, consisting of pump synchronized with rapidly tunable programmable (PL), can access over significant fraction high wavenumber region (2700-2950 cm(-1)) at rates up to 10,000 spectral points per second. To demonstrate its capabilities, we have...
The use of coherent anti-Stokes Raman scattering microscopy tuned to the lipid vibration for quantitative myelin imaging suffers from excitation polarization dependence this third-order nonlinear optical effect. contrast obtained depends on orientation membrane, which in turn affects morphometric parameters that can be extracted with image analysis. We show how circularly polarized laser beams used avoid complication, leading images free dependence. technique promises optimal vivo and...
We present a Chandra X-ray Observatory investigation of the millisecond pulsars (MSPs) in globular cluster M28 (NGC 6626). In what is one deepest observations cluster, we firmly detect seven and possibly two twelve known pulsars. With exception PSRs B1821-24 J1824-2452H, detected have relatively soft spectra, with luminosities 10^30-31 ergs s^-1 (0.3-8 keV),similar to most "recycled" 47 Tucanae field Galaxy, implying thermal emission from pulsar magnetic polar caps. detailed spectrum date...
We report a 5.4σ detection of pulsed gamma rays from PSR B1821−24 in the globular cluster M28 using ∼44 months Fermi Large Area Telescope (LAT) data that have been reprocessed with improved instrument calibration constants. constructed phase-coherent ephemeris, post-fit residual rms 3 μs, radio spanning ∼23.2 yr, enabling measurements multi-wavelength light-curve properties at milliperiod level. fold RXTE observations 1996 to 2007 and discuss implications on emission zones. The gamma-ray...
A fully automated method for large-scale segmentation of nerve fibers from coherent anti-Stokes Raman scattering (CARS) microscopy images is presented. The specifically designed CARS transverse cross sections nervous tissue but also suitable use with standard light images. After a detailed description the two-part algorithm, its accuracy quantified by comparing resulting binary to manually segmented We then demonstrate ability our retrieve morphological data tissue. Finally, we present large...
We report on the optical identification of companion star to eclipsing millisecond pulsar PSR J1824-2452H in galactic globular cluster M28 (NGC 6626). This is at only 0.2" from nominal position and it shows variability (~ 0.25 mag) that nicely correlates with orbital period. It located blue side main sequence, ~1.5 mag fainter than turn-off point. The observed light curve two distinct asymmetric minima, suggesting suffering tidal distortion pulsar. discovery increases number non-degenerate...
Abstract Studies of tissue remodeling require in vivo imaging techniques that are as minimally invasive possible to avoid microenvironment perturbations. To this end, spontaneous Raman have been used but low signals limited their application mostly point spectroscopy measurements. Novel Raman‐based such coherent and stimulated scattering can overcome limitation. This manuscript discusses applications with contrast for monitoring, how these be combined into spectral imaging. (© 2009 WILEY‐VCH...
We present an automated two-dimensional Fourier transform (2D-FT) approach to analyze the local organization of myelinated axons in spinal cord. Coherent anti-Stokes Raman scattering (CARS) microscopy was used observe lesions a commonly animal model multiple sclerosis (MS), experimental autoimmune encephalomyelitis (EAE). A 2D-FT applied on CARS images find average orientation and directional anisotropy fibers within contiguous image domains. introduce corrected correlation parameter (CCP),...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Paulo C. Freire, Scott M. Ransom, Steve Bégin, Ingrid H. Stairs, Jason W. T. Hessels, Lucille Frey, Fernando Camilo; Eight new MSPs in NGC 6440 6441. AIP Conf. Proc. 27 February 2008; 983 (1): 604–606. https://doi.org/10.1063/1.2900307 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends...
We present a fiber-based fully programmable Synchronized picosecond Laser, composed of fixed wavelength master-oscillator power amplifier and tunable in adjustable pulse width, repetition rate Programmable Laser. Article not available.
We present hyper spectral imaging in the high wavenumber region of thick tissue samples made possible by a wavelength-swept coherent Anti-Stokes Raman scattering (WS-CARS) spectroscopy system where lines are excited sequentially at rates up to 50,000 per seconds.