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https://www.readbyqxmd.com/read/28332538/how-to-hunt-for-a-black-hole-with-a-telescope-the-size-of-earth
#1
Davide Castelvecchi
No abstract text is available yet for this article.
March 22, 2017: Nature
https://www.readbyqxmd.com/read/28332526/astronomy-star-orbits-close-to-black-hole
#2
(no author information available yet)
No abstract text is available yet for this article.
March 22, 2017: Nature
https://www.readbyqxmd.com/read/28324782/two-dimensional-bismuth-oxybromide-coupled-with-molybdenum-disulphide-for-enhanced-dye-degradation-using-low-power-energy-saving-light-bulb
#3
W P Cathie Lee, Fhu-Hin Wong, Nicole K Attenborough, Xin Ying Kong, Lling-Lling Tan, S Sumathi, Siang-Piao Chai
In the present work, two-dimensional bismuth oxybromide (BiOBr) was synthesized and coupled with co-catalyst molybdenum disulphide (MoS2) via a simple hydrothermal process. The photoactivity of the resulting hybrid photocatalyst (MoS2/BiOBr) was evaluated under the irradiation of 15 W energy-saving light bulb at ambient condition using Reactive Black 5 (RB5) as model dye solution. The photo-degradation of RB5 by BiOBr loaded with 0.2 wt% MoS2 (MoBi-2) exhibited more than 1.4 and 5.0 folds of enhancement over pristine BiOBr and titanium dioxide (Degussa, P25), respectively...
March 18, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28319032/binary-neutron-star-mergers-a-review-of-einstein-s-richest-laboratory
#4
Luca Baiotti, Luciano Rezzolla
The merger of binary neutron-stars systems combines in a single process: extreme gravity, copious emission of gravitational waves, complex microphysics, and electromagnetic processes that can lead to astrophysical signatures observable at the largest redshifts. We review here the recent progress in understanding what could be considered Einstein's richest laboratory, highlighting in particular the numerous significant advances of the last decade. Although special attention is paid to the status of models, techniques, and results for fully general-relativistic dynamical simulations, a review is also offered on initial data and advanced simulations with approximate treatments of gravity...
March 20, 2017: Reports on Progress in Physics
https://www.readbyqxmd.com/read/28318291/consistent-individual-differences-in-standard-exploration-tasks-in-the-black-rat-rattus-rattus
#5
Barbora Žampachová, Barbora Kaftanová, Hana Šimánková, Eva Landová, Daniel Frynta
In a fluctuating environment, the optimal level of exploratory behavior depends on the proportion of current risks and benefits. The exploratory behavior is, therefore, often subjected to heterogenous selection. In populations of commensal rodents living in close proximity of humans, this pressure is further increased by pest management. We hypothesize that the black rat (Rattus rattus) responds to this pressure by either high behavioral flexibility or by development of personality types. The aim of this study was to analyze exploratory behavior and boldness of wild black rats and its changes over time to determine whether exploratory behavior is a personality trait in black rats...
March 20, 2017: Journal of Comparative Psychology
https://www.readbyqxmd.com/read/28306294/nonlinear-zel-dovich-effect-parametric-amplification-from-medium-rotation
#6
Daniele Faccio, Ewan M Wright
The interaction of light with rotating media has attracted recent interest for both fundamental and applied studies including rotational Doppler shift measurements. It is also possible to obtain amplification through the scattering of light with orbital angular momentum from a rotating and absorbing cylinder, as proposed by Zel'dovich more than forty years ago. This amplification mechanism has never been observed experimentally yet has connections to other fields such as Penrose superradiance in rotating black holes...
March 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28283663/ligo-and-the-opening-of-a-unique-observational-window-on-the-universe
#7
Vassiliki Kalogera, Albert Lazzarini
A unique window on the universe opened on September 14, 2015, with direct detection of gravitational waves by the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) detectors. This event culminated a half-century effort around the globe to develop terrestrial detectors of adequate sensitivity to achieve this goal. It also happened appropriately only a few months before the centennial of Einstein's final paper introducing the general theory of relativity. This detection provided the surprising discovery of a coalescing pair of "heavy" black holes (more massive than [Formula: see text] M[Formula: see text]) leading to the formation of a spinning [Formula: see text]62 solar mass black hole...
March 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28282182/catalytic-decoupling-of-quantum-information
#8
Christian Majenz, Mario Berta, Frédéric Dupuis, Renato Renner, Matthias Christandl
The decoupling technique is a fundamental tool in quantum information theory with applications ranging from thermodynamics to many-body physics and black hole radiation whereby a quantum system is decoupled from another one by discarding an appropriately chosen part of it. Here, we introduce catalytic decoupling, i.e., decoupling with the help of an independent system. Thereby, we remove a restriction on the standard decoupling notion and present a tight characterization in terms of the max-mutual information...
February 24, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28281570/impurity-bound-states-in-fully-gapped-d-wave-superconductors-with-subdominant-order-parameters
#9
Mahdi Mashkoori, Kristofer Björnson, Annica M Black-Schaffer
Impurities in superconductors and their induced bound states are important both for engineering novel states such as Majorana zero-energy modes and for probing bulk properties of the superconducting state. The high-temperature cuprates offer a clear advantage in a much larger superconducting order parameter, but the nodal energy spectrum of a pure d-wave superconductor only allows virtual bound states. Fully gapped d-wave superconducting states have, however, been proposed in several cuprate systems thanks to subdominant order parameters producing d + is- or d + id'-wave superconducting states...
March 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28268962/biomarker-discovery-based-on-bbha-and-adaboostm1-on-microarray-data-for-cancer-classification
#10
Elnaz Pashaei, Mustafa Ozen, Nizamettin Aydin
In this paper, a new approach based on Binary Black Hole Algorithm (BBHA) and Adaptive Boosting version Ml (AdaboostM1) is proposed for finding genes that can classify the group of cancers correctly. In this approach, BBHA is used to perform gene selection and AdaboostM1 with 10-fold cross validation is adopted as the classifier. Also, to find the relation between the biomarkers for biological point of view, decision tree algorithm (C4.5) is utilized. The proposed approach is tested on three benchmark microarrays...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28254890/global-telescope-gears-up-to-image-black-holes
#11
Daniel Clery
No abstract text is available yet for this article.
March 3, 2017: Science
https://www.readbyqxmd.com/read/28252065/the-response-of-relativistic-outflowing-gas-to-the-inner-accretion-disk-of-a-black-hole
#12
Michael L Parker, Ciro Pinto, Andrew C Fabian, Anne Lohfink, Douglas J K Buisson, William N Alston, Erin Kara, Edward M Cackett, Chia-Ying Chiang, Thomas Dauser, Barbara De Marco, Luigi C Gallo, Javier Garcia, Fiona A Harrison, Ashley L King, Matthew J Middleton, Jon M Miller, Giovanni Miniutti, Christopher S Reynolds, Phil Uttley, Ranjan Vasudevan, Dominic J Walton, Daniel R Wilkins, Abderahmen Zoghbi
The brightness of an active galactic nucleus is set by the gas falling onto it from the galaxy, and the gas infall rate is regulated by the brightness of the active galactic nucleus; this feedback loop is the process by which supermassive black holes in the centres of galaxies may moderate the growth of their hosts. Gas outflows (in the form of disk winds) release huge quantities of energy into the interstellar medium, potentially clearing the surrounding gas. The most extreme (in terms of speed and energy) of these-the ultrafast outflows-are the subset of X-ray-detected outflows with velocities higher than 10,000 kilometres per second, believed to originate in relativistic (that is, near the speed of light) disk winds a few hundred gravitational radii from the black hole...
March 1, 2017: Nature
https://www.readbyqxmd.com/read/28244217/novel-foam-dressing-using-negative-pressure-wound-therapy-with-instillation-to-remove-thick-exudate
#13
Luc Téot, Florient Boissiere, Sergiu Fluieraru
We describe our experience with a novel foam dressing architecture in tandem with negative pressure wound therapy and instillation (NPWTi-d) for removing viscous wound exudate and infectious materials. A retrospective review was conducted of the outcomes of 21 patients who received NPWTi-d using a reticulated open cell foam instillation dressing with through holes (ROCF-CC) designed to facilitate the removal of thick wound exudate and infectious materials. NPWTi-d with ROCF-CC was used to treat large complex chronic wounds with viscous wound exudate that contained substantial areas of devitalised tissue...
February 28, 2017: International Wound Journal
https://www.readbyqxmd.com/read/28243557/laser-irradiation-in-water-for-the-novel-scalable-synthesis-of-black-tio-x-photocatalyst-for-environmental-remediation
#14
Massimo Zimbone, Giuseppe Cacciato, Mohamed Boutinguiza, Vittorio Privitera, Maria Grazia Grimaldi
Since 1970, TiO2 photocatalysis has been considered a possible alternative for sustainable water treatment. This is due to its material stability, abundance, nontoxicity and high activity. Unfortunately, its wide band gap (≈3.2 eV) in the UV portion of the spectrum makes it inefficient under solar illumination. Recently, so-called "black TiO2" has been proposed as a candidate to overcome this issue. However, typical synthesis routes require high hydrogen pressure and long annealing treatments. In this work, we present an industrially scalable synthesis of TiO2-based material based on laser irradiation...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28227169/biomarker-discovery-based-on-bbha-and-adaboostm1-on-microarray-data-for-cancer-classification
#15
Elnaz Pashaei, Mustafa Ozen, Nizamettin Aydin, Elnaz Pashaei, Mustafa Ozen, Nizamettin Aydin, Nizamettin Aydin, Elnaz Pashaei, Mustafa Ozen
In this paper, a new approach based on Binary Black Hole Algorithm (BBHA) and Adaptive Boosting version Ml (AdaboostM1) is proposed for finding genes that can classify the group of cancers correctly. In this approach, BBHA is used to perform gene selection and AdaboostM1 with 10-fold cross validation is adopted as the classifier. Also, to find the relation between the biomarkers for biological point of view, decision tree algorithm (C4.5) is utilized. The proposed approach is tested on three benchmark microarrays...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28219970/an-accreting-pulsar-with-extreme-properties-drives-an-ultraluminous-x-ray-source-in-ngc-5907
#16
Gian Luca Israel, Andrea Belfiore, Luigi Stella, Paolo Esposito, Piergiorgio Casella, Andrea De Luca, Martino Marelli, Alessandro Papitto, Matteo Perri, Simonetta Puccetti, Guillermo A Rodríguez Castillo, David Salvetti, Andrea Tiengo, Luca Zampieri, Daniele D'Agostino, Jochen Greiner, Frank Haberl, Giovanni Novara, Ruben Salvaterra, Roberto Turolla, Mike Watson, Joern Wilms, Anna Wolter
Ultraluminous x-ray sources (ULXs) in nearby galaxies shine brighter than any x-ray source in our Galaxy. ULXs are usually modeled as stellar-mass black holes (BHs) accreting at very high rates or intermediate-mass BHs. We present observations showing that NGC 5907 ULX is instead an x-ray accreting neutron star (NS) with a spin period evolving from 1.43 seconds in 2003 to 1.13 seconds in 2014. It has an isotropic peak luminosity of [Formula: see text]1000 times the Eddington limit for a NS at 17.1 megaparsec...
February 24, 2017: Science
https://www.readbyqxmd.com/read/28211707/relativistic-magnetic-reconnection-in-kerr-spacetime
#17
Felipe A Asenjo, Luca Comisso
The magnetic reconnection process is analyzed for relativistic magnetohydrodynamical plasmas around rotating black holes. A simple generalization of the Sweet-Parker model is used as a first approximation to the problem. The reconnection rate, as well as other important properties of the reconnection layer, has been calculated taking into account the effect of spacetime curvature. Azimuthal and radial current sheet configurations in the equatorial plane of the black hole have been studied, and the case of small black hole rotation rate has been analyzed...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28196226/-hypodense-holes-and-the-ocular-glymphatic-system-author-response-black-holes-and-the-ocular-glymphatic-system
#18
Peter Wostyn, Veva De Groot, Debby Van Dam, Kurt Audenaert, Peter Paul De Deyn, Hanspeter Esriel Killer
No abstract text is available yet for this article.
February 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28195492/gate-tunable-giant-stark-effect-in-few-layer-black-phosphorus
#19
Yanpeng Liu, Zhizhan Qiu, Alexandra Carvalho, Yang Bao, Hai Xu, Sherman J R Tan, Wei Liu, A H Castro Neto, Kian Ping Loh, Jiong Lu
Two-dimensional black phosphorus (BP) has sparked enormous research interest due to its high carrier mobility, layer-dependent direct bandgap and outstanding in-plane anisotropic properties. BP is one of the few two-dimensional materials where it is possible to tune the bandgap over a wide energy range from the visible up to the infrared. In this article, we report the observation of a giant Stark effect in electrostatically gated few-layer BP. Using low-temperature scanning tunnelling microscopy, we observed that in few-layer BP, when electrons are injected, a monotonic reduction of the bandgap occurs...
March 8, 2017: Nano Letters
https://www.readbyqxmd.com/read/28190830/f%C3%A3-rster-resonance-energy-transfer-mediated-photoluminescence-quenching-in-stoichiometrically-assembled-cdse-zns-quantum-dot-peptide-labeled-black-hole-quencher-conjugates-for-matrix-metalloproteinase-2-sensing
#20
Sreenadh Sasidharan Pillai, Hiroshi Yukawa, Daisuke Onoshima, Vasudevanpillai Biju, Yoshinobu Baba
The steady state and time-resolved photoluminescence quenching of streptavidin modified CdSe/ZnS quantum dots (QDs) instigated by biotin-peptide-BHQ-1 (biotin-pep-BHQ-1) molecule was investigated. Here, we have achieved an efficient photoluminescence (PL) quenching of QDs with the conjugation of dark quencher (black hole quencher-BHQ) molecules intermediated with the GPLGVRGK peptide. The luminescence of streptavidin-QDs585 was decreased upon titration with a nano molar concentration of the biotin-GPLGVRGK-BHQ-1 molecule...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
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