Search
Results: 2398
Chan-Vese Reformulation for Selective Image Segmentation.
Selective segmentation involves incorporating user input to partition an image into foreground and background, by discriminating between objects of a similar type. Typically, such methods involve introducing additional...
Validation of Performance Homogeneity of Chan-Vese Model on Selected Tumour Cells
This study aims to analyze the Chan-Vese model's performance using a variety of tumor images. The processes involve the tumors' segmentation, detecting the tumors, identifying the segmented tumor region, and extracting the...
Published by: IGI Global Scientific Publishing
The ‘ownership’ of science
Dr Catherine Rhodes is a research fellow at the Institute for Science, Ethics and Innovation specialising in the international regulations relevant to control of biotechnology. Professor John Harris is director of the Institute...
Printable Perovskite Diodes for Broad-Spectrum Multienergy X-Ray Detection.
Babar Shabbir, Jae Choul Yu, Tharindu Warnakula, RAW Ayyubi, James A Pollock, M Mosarof Hossain, Jueng-Eun Kim, Nasiruddin Macadam, Leonard WT Ng, Tawfique Hasan, Doojin Vak, Marcus J Kitchen, Jacek J Jasieniak
Mar 30, 2023
Multienergy X-ray detection is critical to effectively differentiate materials in a variety of diagnostic radiology and nondestructive testing applications. Silicon and selenium X-ray detectors are the most common for...
Cosmological distances with general-relativistic ray tracing
Abstract
In this work we present the first results from a new ray-tracing tool to calculate
cosmological distances in the context of fully nonlinear general relativity. We use...
Hayley J Macpherson
Mar 07, 2023
Searching for axion-like particles with X-ray polarimeters
X-ray telescopes are an exceptional tool for searching for new fundamental physics. In particular, X-ray observations have already placed world-leading bounds on the interaction between photons and axion-like particles (ALPs)....
Dynamic structure elucidation of chemical reactivity by laser pulses and X-ray probes
Visualising chemical reactions by X-ray methods is a tantalising prospect. New light sources provide the prospect for studying atomic, electronic and energy transfers accompanying chemical change by X-ray spectroscopy and...
A long-lived neutron star merger remnant in GW170817
L. Piro, Bing Zhang, Eleanora Troja, Geoffrey Ryan, Hendrik Van Eerten, R Ricci, M. H. Wieringa, A. Tiengo, N Butler, S. B. Cenko, O. D. Fox, H. G. Khandrika, G. Novara, T. Sakamoto
Feb 01, 2019
Multimessenger observations of GW170817 have not conclusively established whether the merger remnant is a black hole (BH) or a neutron star (NS). We show that a long-lived magnetized NS with a poloidal field B ≈ 1012 G is fully...
The First High-contrast Images of X-Ray Binaries
Abstract
X-ray binaries provide exceptional laboratories for understanding the physics of matter under the most extreme conditions. Until recently, there were few, if any...
M Prasow-Émond, J Hlavacek-Larrondo, K Fogarty, J Rameau, L-S Guité, D Mawet, P Gandhi, A Rao, JF Steiner, É Artigau, D Lafrenière, AC Fabian, DJ Walton, LM Weiss, R Doyon, BB Ren 任彬, CL Rhea, T Bégin, B Vigneron, M-E Naud
Jun 13, 2022
A long-lived neutron star merger remnant in GW170817
L. Piro, Bing Zhang, Eleanora Troja, Geoffrey Ryan, Hendrik Van Eerten, R Ricci, M. H. Wieringa, A. Tiengo, N Butler, S. B. Cenko, O. D. Fox, H. G. Khandrika, G. Novara, T. Sakamoto
Feb 01, 2019
Multimessenger observations of GW170817 have not conclusively established whether the merger remnant is a black hole (BH) or a neutron star (NS). We show that a long-lived magnetized NS with a poloidal field B ≈ 1012 G is fully...
Structure and function of L-threonine-3-dehydrogenase from the parasitic protozoan Trypanosoma brucei revealed by X-ray crystallography and geometric simulations
Eyram Adjogatse, Peter Erskine, Stephen A. Wells, John M. Kelly, Jonathan D. Wilden, A. W.Edith Chan, David Selwood, Alun Coker, Steve Wood, Jonathan B. Cooper
Sep 01, 2018
Two of the world’s most neglected tropical diseases, human African trypanosomiasis (HAT) and Chagas disease, are caused by protozoan parasites of the genus Trypanosoma. These organisms possess specialized metabolic pathways...
Relativistic X-Ray Reverberation from Super-Eddington Accretion Flow
X-ray reverberation is a powerful technique which maps out the structure of
the inner regions of accretion disks around black holes using the echoes of the
coronal emission reflected by the disk. While the theory of X-ray...
The hyperluminous X‐ray source population
We have recently published a catalog of 1843 candidate ultraluminous X‐ray sources (ULXs). This is the largest catalog of ULXs to date and was built by cross‐correlating recent serendipitous source catalogs from the XMM‐Newton...
Super-Eddington accretion on to the neutron star NGC7793 P13
DJ Walton, F Furst, FA Harrison, D Stern, M Bachetti, D Barret, M Brightman, AC Fabian, MJ Middleton, A Ptak, L Tao
Jun 13, 2018
We present a detailed, broad-band X-ray spectral analysis of the ultraluminous X-ray source (ULX) pulsar NGC 7793 P13, a known super-Eddington source, utilizing data from the XMM–Newton, NuSTAR and Chandra observatories. The...
Radio flares from gamma-ray bursts
D. Kopac, C. G. Mundell, S. Kobayashi, F. J. Virgili, Roger Harrison, J. Japelj, C. Guidorzi, A. Melandri, A. Gomboc
Jun 20, 2015
We present predictions of centimeter and millimeter radio emission from reverse shocks in the early afterglows of gamma-ray bursts with the goal of determining their detectability with current and future radio facilities. Using...
Ab initio nonrigid X-ray nanotomography
Michal Odstrcil, Mirko Holler, Jörg Raabe, Alessandro Sepe, Xiaoyuan Sheng, Silvia Vignolini, Christian G. Schroer, Manuel Guizar-Sicairos
Jun 12, 2020
Abstract: Reaching the full potential of X-ray nanotomography, in particular for biological samples, is limited by many factors, of which one of the most serious is radiation damage. Although sample deformation caused by...
Dynamic structure elucidation of chemical reactivity by laser pulses and X-ray probes
Visualising chemical reactions by X-ray methods is a tantalising prospect. New light sources provide the prospect for studying atomic, electronic and energy transfers accompanying chemical change by X-ray spectroscopy and...
Ab initio nonrigid X-ray nanotomography.
Michal Odstrcil, Mirko Holler, Jörg Raabe, Alessandro Sepe, Xiaoyuan Sheng, Silvia Vignolini, Christian G Schroer, Manuel Guizar-Sicairos
Aug 21, 2019
Reaching the full potential of X-ray nanotomography, in particular for biological samples, is limited by many factors, of which one of the most serious is radiation damage. Although sample deformation caused by radiation damage...
Structure and function of L-threonine-3-dehydrogenase from the parasitic protozoan Trypanosoma brucei revealed by X-ray crystallography and geometric simulations
Eyram Adjogatse, Peter Erskine, Stephen A. Wells, John M. Kelly, Jonathan D. Wilden, A. W.Edith Chan, David Selwood, Alun Coker, Steve Wood, Jonathan B. Cooper
Sep 01, 2018
Two of the world’s most neglected tropical diseases, human African trypanosomiasis (HAT) and Chagas disease, are caused by protozoan parasites of the genus Trypanosoma. These organisms possess specialized metabolic pathways...
The Grizzly, February 22, 1980
Brian Barlow, Laura Bossone, Thomas A. Reilly, Stephanie Kane, Diana Dakay, Rick Morris, Laurence Backalian, Jennifer Bassett, Jay Repko, Ann Edris, David Garner, Jeffrey Plunkett, Michael Chiarappa, Jean Morrison, Ray Templin
Jan 01, 0001
Freshmen Survey Results Explored Songfest Boycott Considered Career Planning Close-up Eilts Selected As Graduation Speaker USGA Notes Baltz Returns to Union Coffeehouse 1979 Music Awards "Captain Ray of Light's"...
Ursinus College Collegeville Pennsylvania newspaper Songfest first year students Placement Office Hermann F. Eilts student government Ron Baltz Pi Nu Epsilon fraternities Alpha Phi Epsilon Alpha Phi Omega Beta Sigma Lambda Delta Pi Sigma Pi Omega Delta Sigma Rho Lambda pledging Gregory Stapp Basketball chess Larry Christiansen Swimming wrestling gymnastics Intramural Sports cultural history Higher Education Liberal Studies Social History United States History
Published by: Ursinus College
Radio flares from gamma-ray bursts
D. Kopac, C. G. Mundell, S. Kobayashi, F. J. Virgili, Roger Harrison, J. Japelj, C. Guidorzi, A. Melandri, A. Gomboc
Jun 20, 2015
We present predictions of centimeter and millimeter radio emission from reverse shocks in the early afterglows of gamma-ray bursts with the goal of determining their detectability with current and future radio facilities. Using...
The X-ray counterpart to the gravitational wave event GW 170817
Eleanora Troja, L. Piro, H. van Eerten, R. T. Wollaeger, M. Im, O. D. Fox, N. R. Butler, S. B. Cenko, T. Sakamoto, C. L. Fryer, R Ricci, A. Lien, R. E. Ryan Jr, O. Korobkin, S. -K. Lee, J. Michael Burgess, W. H. Lee, A. M. Watson, C. Choi, S. Covino, P. D' Avanzo, C. J. Fontes, J. Becerra Gonzalez, H. G. Khandrika, J. Kim, S. -L. Kim, C. -U. Lee, H. M. Lee, A. Kutyrev, G. Lim, R. Sanchez-Ramirez, Sylvain Veilleux, M. H. Wieringa, Y. Yoon
Nov 02, 2017
A long-standing paradigm in astrophysics is that collisions—or mergers—of two neutron stars form highly relativistic and collimated outflows (jets) that power γ-ray bursts of short (less than two seconds) duration1,2,3. The...
The X-ray counterpart to the gravitational wave event GW 170817
Eleanora Troja, L. Piro, H. van Eerten, R. T. Wollaeger, M. Im, O. D. Fox, N. R. Butler, S. B. Cenko, T. Sakamoto, C. L. Fryer, R Ricci, A. Lien, R. E. Ryan Jr, O. Korobkin, S. -K. Lee, J. Michael Burgess, W. H. Lee, A. M. Watson, C. Choi, S. Covino, P. D' Avanzo, C. J. Fontes, J. Becerra Gonzalez, H. G. Khandrika, J. Kim, S. -L. Kim, C. -U. Lee, H. M. Lee, A. Kutyrev, G. Lim, R. Sanchez-Ramirez, Sylvain Veilleux, M. H. Wieringa, Y. Yoon
Nov 02, 2017
A long-standing paradigm in astrophysics is that collisions—or mergers—of two neutron stars form highly relativistic and collimated outflows (jets) that power γ-ray bursts of short (less than two seconds) duration1,2,3. The...
The Black Hole Candidate Swift J1728.9–3613 and the Supernova Remnant G351.9–0.9
Mayura Balakrishnan, Paul A. Draghis, Jon M. Miller, Joe Bright, Robert Fender, Mason Ng, Edward Cackett, Andrew Fabian, Kip Kuntz, James C. A. Miller-Jones, Daniel Proga, Paul S. Ray, John Raymond, Mark Reynolds, Abderahmen Zoghbi
Apr 18, 2023
A number of neutron stars have been observed within the remnants of the core-collapse supernova explosions that created them. In contrast, black holes are not yet clearly associated with supernova remnants (SNRs). Indeed, some...
Published by: The American Astronomical Society
|
|< |
< |
1 |