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https://www.readbyqxmd.com/read/28211707/relativistic-magnetic-reconnection-in-kerr-spacetime
#1
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
#2
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
#3
Yanpeng Liu, Zhizhan Qiu, Alexandra Carvalho, Yang Bao, Hai Xu, Sherman Jun Rong Tan, Wei Liu, Antonio 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...
February 14, 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
#4
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
https://www.readbyqxmd.com/read/28190819/cholecystectomy-in-a-heifer
#5
Takeshi Tsuka, Hinako Tanaka, Shinji Kono, Takehito Morita, Yusuke Murahata, Kazuo Azuma, Tomohiro Osaki, Norihiko Ito, Yoshiharu Okamoto, Tomohiro Imagawa
A 10-month-old female Japanese black heifer presenting with sudden loss of appetite was diagnosed with extreme extension of the gallbladder. Laparotomy reaching from the right part of the 10th rib to the right flank showed an extended gallbladder greater than 50 cm in diameter. Cholecystectomy was performed as follows: 1) complete removal of the gallbladder distally from the base; 2) flushing via a catheter inserted into the common bile duct; and 3) covering of the hole opened in the common bile duct with a double-suturing method using the mucous membrane and muscular layers of the remaining gallbladder structures...
February 10, 2017: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28186781/accelerating-plasma-mirrors-to-investigate-the-black-hole-information-loss-paradox
#6
Pisin Chen, Gerard Mourou
The question of whether Hawking evaporation violates unitarity, and therefore results in the loss of information, has remained unresolved since Hawking's seminal discovery. To date, the investigations have remained mostly theoretical since it is almost impossible to settle this paradox through direct astrophysical black hole observations. Here, we point out that relativistic plasma mirrors can be accelerated drastically and stopped abruptly by impinging intense x-ray pulses on solid plasma targets with a density gradient...
January 27, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28185158/outcome-measures-in-clinical-trials-for-multiple-sclerosis
#7
REVIEW
Caspar E P van Munster, Bernard M J Uitdehaag
Due to the heterogeneous nature of the disease, it is a challenge to capture disease activity of multiple sclerosis (MS) in a reliable and valid way. Therefore, it can be difficult to assess the true efficacy of interventions in clinical trials. In phase III trials in MS, the traditionally used primary clinical outcome measures are the Expanded Disability Status Scale and the relapse rate. Secondary outcome measures in these trials are the number or volume of T2 hyperintense lesions and gadolinium-enhancing T1 lesions on magnetic resonance imaging (MRI) of the brain...
February 9, 2017: CNS Drugs
https://www.readbyqxmd.com/read/28183921/debate-heats-up-over-black-holes-as-dark-matter
#8
Adrian Cho
No abstract text is available yet for this article.
February 10, 2017: Science
https://www.readbyqxmd.com/read/28179654/astronomy-intermediate-mass-black-hole-found
#9
Kayhan Gültekin
No abstract text is available yet for this article.
February 8, 2017: Nature
https://www.readbyqxmd.com/read/28179649/an-intermediate-mass-black-hole-in-the-centre-of-the-globular-cluster-47-tucanae
#10
Bülent Kızıltan, Holger Baumgardt, Abraham Loeb
Intermediate-mass black holes should help us to understand the evolutionary connection between stellar-mass and super-massive black holes. However, the existence of intermediate-mass black holes is still uncertain, and their formation process is therefore unknown. It has long been suspected that black holes with masses 100 to 10,000 times that of the Sun should form and reside in dense stellar systems. Therefore, dedicated observational campaigns have targeted globular clusters for many decades, searching for signatures of these elusive objects...
February 8, 2017: Nature
https://www.readbyqxmd.com/read/28177026/a-co-monolayer-first-principles-design-of-a-new-direct-band-gap-semiconductor-with-excellent-mechanical-properties
#11
Zi-Wei Teng, Chun-Sheng Liu, Xiao-Hong Yan
Group V monolayers, e.g., nitrogene, phosphorene, arsenene, and antimonene have recently emerged as attractive candidates for electronic and optoelectronic applications. However, these pristine monolayers are not able to possess direct band gaps suitable for ultraviolet-blue photoresponse. First-principles calculations show that the Pmma-CO monolayer has a direct band gap of 2.4 eV, and predict that the system has a good stability. Unlike an easy direct-indirect gap transition under small strains in phosphorene, the direct band gap feature of Pmma-CO is maintained under a strain up to 12%...
February 8, 2017: Nanoscale
https://www.readbyqxmd.com/read/28165021/black-tio2-nanobelts-g-c3n4-nanosheets-laminated-heterojunctions-with-efficient-visible-light-driven-photocatalytic-performance
#12
Liyan Shen, Zipeng Xing, Jinlong Zou, Zhenzi Li, Xiaoyan Wu, Yuchi Zhang, Qi Zhu, Shilin Yang, Wei Zhou
Black TiO2 nanobelts/g-C3N4 nanosheets laminated heterojunctions (b-TiO2/g-C3N4) as visible-light-driven photocatalysts are fabricated through a simple hydrothermal-calcination process and an in-situ solid-state chemical reduction approach, followed by the mild thermal treatment (350 °C) in argon atmosphere. The prepared samples are evidently investigated by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, N2 adsorption, and UV-visible diffuse reflectance spectroscopy, respectively...
February 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28150701/discovery-of-a-very-lyman-%C3%AE-luminous-quasar-at-z%C3%A2-%C3%A2-6-62
#13
Ekaterina Koptelova, Chorng-Yuan Hwang, Po-Chieh Yu, Wen-Ping Chen, Jhen-Kuei Guo
Distant luminous quasars provide important information on the growth of the first supermassive black holes, their host galaxies and the epoch of reionization. The identification of quasars is usually performed through detection of their Lyman-α line redshifted to 0.9 microns at z > 6.5. Here, we report the discovery of a very Lyman-α luminous quasar, PSO J006.1240 + 39.2219 at redshift z = 6.618, selected based on its red colour and multi-epoch detection of the Lyman-α emission in a single near-infrared band...
February 2, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28135568/behaviours-and-attitudes-of-recreational-fishers-toward-safety-at-a-blackspot
#14
Randall Jasper, Barbara A Stewart, Andrew Knight
Issue addressed: Recreational fishing, particularly rock fishing, can be dangerous; 30 fatalities were recorded in Western Australia from 2002-2014. This study investigates differences in behaviours and attitudes towards safety among fishers at a fishing fatality 'black spot' in Australia.Methods: A total of 236 fishers were surveyed at Salmon Holes, Western Australia in 2015. Fishers were grouped by country of origin and significant differences among groups for behaviours and attitudes towards personal safety were identified...
January 27, 2017: Health Promotion Journal of Australia
https://www.readbyqxmd.com/read/28128586/superfluid-black-holes
#15
Robie A Hennigar, Robert B Mann, Erickson Tjoa
We present what we believe is the first example of a "λ-line" phase transition in black hole thermodynamics. This is a line of (continuous) second order phase transitions which in the case of liquid ^{4}He marks the onset of superfluidity. The phase transition occurs for a class of asymptotically anti-de Sitter hairy black holes in Lovelock gravity where a real scalar field is conformally coupled to gravity. We discuss the origin of this phase transition and outline the circumstances under which it (or generalizations of it) could occur...
January 13, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28121992/a-secure-region-based-geographic-routing-protocol-srbgr-for-wireless-sensor-networks
#16
Ali Idarous Adnan, Zurina Mohd Hanapi, Mohamed Othman, Zuriati Ahmad Zukarnain
Due to the lack of dependency for routing initiation and an inadequate allocated sextant on responding messages, the secure geographic routing protocols for Wireless Sensor Networks (WSNs) have attracted considerable attention. However, the existing protocols are more likely to drop packets when legitimate nodes fail to respond to the routing initiation messages while attackers in the allocated sextant manage to respond. Furthermore, these protocols are designed with inefficient collection window and inadequate verification criteria which may lead to a high number of attacker selections...
2017: PloS One
https://www.readbyqxmd.com/read/28106407/matter-wave-optical-wave-mixing-induced-transparency-and-a-nonhyperbolic-matter-wave-quasisoliton-in-quantum-gases
#17
Yan Li, Chengjie Zhu, W R Garrett, E W Hagley, L Deng
The realization of atomic quantum gases has brought out surprising effects that have no correspondence in nonlinear optics with thermal gases, presenting intriguing and exciting challenges to the research discipline of nonlinear optics which has matured since the invention of the laser. Here, we show an unexpected optical wave-mixing gain cancellation effect in a quantum gas that restricts an, otherwise, strongly enhanced backward-propagating light-matter wave-mixing process. This results in a wave-mixing induced transparency and a nonhyperbolic quasi-matter-wave soliton that opens new research opportunities in hydrodynamic fluid research of degenerate quantum gases, such as phonon scattering in a two-dimensional sonic black hole horizon...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28106405/self-force-corrections-to-the-periapsis-advance-around-a-spinning-black-hole
#18
Maarten van de Meent
The linear in mass ratio correction to the periapsis advance of equatorial nearly circular orbits around a spinning black hole is calculated for the first time and to a very high precision, providing a key benchmark for different approaches modeling spinning binaries. The high precision of the calculation is leveraged to discriminate between two recent incompatible derivations of the 4 post-Newtonian equations of motion. Finally, the limit of the periapsis advance near the innermost stable orbit (ISCO) allows the determination of the ISCO shift, validating previous calculations using the first law of binary mechanics...
January 6, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28059711/t1-recovery-is-predominantly-found-in-black-holes-and-is-associated-with-clinical-improvement-in-patients-with-multiple-sclerosis
#19
C Thaler, T D Faizy, J Sedlacik, B Holst, K Stürner, C Heesen, J-P Stellmann, J Fiehler, S Siemonsen
BACKGROUND AND PURPOSE: Quantitative MR imaging parameters help to evaluate disease progression in multiple sclerosis and increase correlation with clinical disability. We therefore hypothesized that T1 values might be a marker for ongoing tissue damage or even remyelination and may help increase clinical correlation. MATERIALS AND METHODS: MR imaging was performed in 17 patients with relapsing-remitting MS at baseline and after 12 months of starting immunotherapy with dimethyl fumarate...
November 10, 2016: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28043139/structural-stability-vibrational-properties-and-photoluminescence-in-cssni3-perovskite-upon-the-addition-of-snf2
#20
Athanassios G Kontos, Andreas Kaltzoglou, Eirini Siranidi, Dimitrios Palles, Giasemi K Angeli, Michalis K Arfanis, Vassilis Psycharis, Yannis S Raptis, Efstratios I Kamitsos, Pantelis N Trikalitis, Constantinos C Stoumpos, Mercouri G Kanatzidis, Polycarpos Falaras
The CsSnI3 perovskite and the corresponding SnF2-containing material with nominal composition CsSnI2.95F0.05 were synthesized by solid-state reactions and structurally characterized by powder X-ray diffraction. Both materials undergo rapid phase transformation upon exposure to air from the black orthorhombic phase (B-γ-CsSnI3) to the yellow orthorhombic phase (Y-CsSnI3), followed by irreversible oxidation into Cs2SnI6 within several hours. The phase transition occurs at a significantly lower rate in the SnF2-containing material rather than in the pure perovskite...
January 3, 2017: Inorganic Chemistry
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