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https://www.readbyqxmd.com/read/28430501/metric-independence-of-vacuum-and-force-free-electromagnetic-fields
#1
Abraham I Harte
Electromagnetic fields which solve the vacuum Maxwell equations in one spacetime are well known to also be solutions in all spacetimes with conformally related metrics. This provides a sense in which electromagnetism alone cannot be used to measure certain aspects of geometry. We show that there is actually much more which cannot be so measured; relatively little of a spacetime's geometry is in fact imprinted in any particular electromagnetic field. This is demonstrated by finding a much larger class of metric transformations-involving five free functions-which preserve Maxwell solutions both in vacuum, without local currents, and also for the force-free electrodynamics associated with a tenuous plasma...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28430496/renormalized-stress-energy-tensor-of-an-evaporating-spinning-black-hole
#2
Adam Levi, Ehud Eilon, Amos Ori, Maarten van de Meent
We provide the first calculation of the renormalized stress-energy tensor (RSET) of a quantum field in Kerr spacetime (describing a stationary spinning black hole). More specifically, we employ a recently developed mode-sum regularization method to compute the RSET of a minimally coupled massless scalar field in the Unruh vacuum state, the quantum state corresponding to an evaporating black hole. The computation is done here for the case a=0.7M, using two different variants of the method: t splitting and φ splitting, yielding good agreement between the two (in the domain where both are applicable)...
April 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28415268/delayed-collapses-of-bose-einstein-condensates-in-relation-to-anti-de-sitter-gravity
#3
Anxo F Biasi, Javier Mas, Angel Paredes
We numerically investigate spherically symmetric collapses in the Gross-Pitaevskii equation with attractive nonlinearity in a harmonic potential. Even below threshold for direct collapse, the wave function bounces off from the origin and may eventually become singular after a number of oscillations in the trapping potential. This is reminiscent of the evolution of Einstein gravity sourced by a scalar field in anti de Sitter space where collapse corresponds to black-hole formation. We carefully examine the long time evolution of the wave function for continuous families of initial states in order to sharpen out this qualitative coincidence which may bring new insights in both directions...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28409965/quantum-backreaction-on-three-dimensional-black-holes-and-naked-singularities
#4
Marc Casals, Alessandro Fabbri, Cristián Martínez, Jorge Zanelli
We analytically investigate backreaction by a quantum scalar field on two rotating Bañados-Teitelboim-Zanelli (BTZ) geometries: that of a black hole and that of a naked singularity. In the former case, we explore the quantum effects on various regions of relevance for a rotating black hole space-time. We find that the quantum effects lead to a growth of both the event horizon and the radius of the ergosphere, and to a reduction of the angular velocity, compared to the unperturbed values. Furthermore, they give rise to the formation of a curvature singularity at the Cauchy horizon and show no evidence of the appearance of a superradiant instability...
March 31, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28401603/few-layer-black-phosphorus-carbide-field-effect-transistor-via-carbon-doping
#5
Wee Chong Tan, Yongqing Cai, Rui Jie Ng, Li Huang, Xuewei Feng, Gang Zhang, Yong-Wei Zhang, Christian A Nijhuis, Xinke Liu, Kah-Wee Ang
Black phosphorus carbide (b-PC) is a new family of layered semiconducting material that has recently been predicted to have the lightest electrons and holes among all known 2D semiconductors, yielding a p-type mobility (≈10(5) cm(2) V(-1) s(-1) ) at room temperature that is approximately five times larger than the maximum value in black phosphorus. Here, a high-performance composite few-layer b-PC field-effect transistor fabricated via a novel carbon doping technique which achieved a high hole mobility of 1995 cm(2) V(-1) s(-1) at room temperature is reported...
April 12, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28393018/sonophore-labeled-rgd-a-targeted-contrast-agent-for-optoacoustic-imaging
#6
Katja Haedicke, Christian Brand, Murad Omar, Vasilis Ntziachristos, Thomas Reiner, Jan Grimm
Optoacoustic imaging is a rapidly expanding field for the diagnosis, characterization, and treatment evaluation of cancer. However, the availability of tumor specific exogenous contrast agents is still limited. Here, we report on a small targeted contrast agent for optoacoustic imaging using a black hole quencher(®) (BHQ) dye. The sonophore BHQ-1 exhibited strong, concentration-dependent, optoacoustic signals in phantoms, demonstrating its ideal suitability for optoacoustic imaging. After labeling BHQ-1 with cyclic RGD-peptide, BHQ-1-cRGD specifically bound to αvβ3-integrin expressing glioblastoma cell spheroids in vitro...
June 2017: Photoacoustics
https://www.readbyqxmd.com/read/28388180/upper-limits-on-the-stochastic-gravitational-wave-background-from-advanced-ligo-s-first-observing-run
#7
B P Abbott, R Abbott, T D Abbott, M R Abernathy, F Acernese, K Ackley, C Adams, T Adams, P Addesso, R X Adhikari, V B Adya, C Affeldt, M Agathos, K Agatsuma, N Aggarwal, O D Aguiar, L Aiello, A Ain, P Ajith, B Allen, A Allocca, P A Altin, A Ananyeva, S B Anderson, W G Anderson, S Appert, K Arai, M C Araya, J S Areeda, N Arnaud, K G Arun, S Ascenzi, G Ashton, M Ast, S M Aston, P Astone, P Aufmuth, C Aulbert, A Avila-Alvarez, S Babak, P Bacon, M K M Bader, P T Baker, F Baldaccini, G Ballardin, S W Ballmer, J C Barayoga, S E Barclay, B C Barish, D Barker, F Barone, B Barr, L Barsotti, M Barsuglia, D Barta, J Bartlett, I Bartos, R Bassiri, A Basti, J C Batch, C Baune, V Bavigadda, M Bazzan, C Beer, M Bejger, I Belahcene, M Belgin, A S Bell, B K Berger, G Bergmann, C P L Berry, D Bersanetti, A Bertolini, J Betzwieser, S Bhagwat, R Bhandare, I A Bilenko, G Billingsley, C R Billman, J Birch, R Birney, O Birnholtz, S Biscans, A S Biscoveanu, A Bisht, M Bitossi, C Biwer, M A Bizouard, J K Blackburn, J Blackman, C D Blair, D G Blair, R M Blair, S Bloemen, O Bock, M Boer, G Bogaert, A Bohe, F Bondu, R Bonnand, B A Boom, R Bork, V Boschi, S Bose, Y Bouffanais, A Bozzi, C Bradaschia, P R Brady, V B Braginsky, M Branchesi, J E Brau, T Briant, A Brillet, M Brinkmann, V Brisson, P Brockill, J E Broida, A F Brooks, D A Brown, D D Brown, N M Brown, S Brunett, C C Buchanan, A Buikema, T Bulik, H J Bulten, A Buonanno, D Buskulic, C Buy, R L Byer, M Cabero, L Cadonati, G Cagnoli, C Cahillane, J Calderón Bustillo, T A Callister, E Calloni, J B Camp, W Campbell, M Canepa, K C Cannon, H Cao, J Cao, C D Capano, E Capocasa, F Carbognani, S Caride, J Casanueva Diaz, C Casentini, S Caudill, M Cavaglià, F Cavalier, R Cavalieri, G Cella, C B Cepeda, L Cerboni Baiardi, G Cerretani, E Cesarini, S J Chamberlin, M Chan, S Chao, P Charlton, E Chassande-Mottin, B D Cheeseboro, H Y Chen, Y Chen, H-P Cheng, A Chincarini, A Chiummo, T Chmiel, H S Cho, M Cho, J H Chow, N Christensen, Q Chu, A J K Chua, S Chua, S Chung, G Ciani, F Clara, J A Clark, F Cleva, C Cocchieri, E Coccia, P-F Cohadon, A Colla, C G Collette, L Cominsky, M Constancio, L Conti, S J Cooper, T R Corbitt, N Cornish, A Corsi, S Cortese, C A Costa, E Coughlin, M W Coughlin, S B Coughlin, J-P Coulon, S T Countryman, P Couvares, P B Covas, E E Cowan, D M Coward, M J Cowart, D C Coyne, R Coyne, J D E Creighton, T D Creighton, J Cripe, S G Crowder, T J Cullen, A Cumming, L Cunningham, E Cuoco, T Dal Canton, S L Danilishin, S D'Antonio, K Danzmann, A Dasgupta, C F Da Silva Costa, V Dattilo, I Dave, M Davier, G S Davies, D Davis, E J Daw, B Day, R Day, S De, D DeBra, G Debreczeni, J Degallaix, M De Laurentis, S Deléglise, W Del Pozzo, T Denker, T Dent, V Dergachev, R De Rosa, R T DeRosa, R DeSalvo, J Devenson, R C Devine, S Dhurandhar, M C Díaz, L Di Fiore, M Di Giovanni, T Di Girolamo, A Di Lieto, S Di Pace, I Di Palma, A Di Virgilio, Z Doctor, V Dolique, F Donovan, K L Dooley, S Doravari, I Dorrington, R Douglas, M Dovale Álvarez, T P Downes, M Drago, R W P Drever, J C Driggers, Z Du, M Ducrot, S E Dwyer, T B Edo, M C Edwards, A Effler, H-B Eggenstein, P Ehrens, J Eichholz, S S Eikenberry, R C Essick, Z Etienne, T Etzel, M Evans, T M Evans, R Everett, M Factourovich, V Fafone, H Fair, S Fairhurst, X Fan, S Farinon, B Farr, W M Farr, E J Fauchon-Jones, M Favata, M Fays, H Fehrmann, M M Fejer, A Fernández Galiana, I Ferrante, E C Ferreira, F Ferrini, F Fidecaro, I Fiori, D Fiorucci, R P Fisher, R Flaminio, M Fletcher, H Fong, S S Forsyth, J-D Fournier, S Frasca, F Frasconi, Z Frei, A Freise, R Frey, V Frey, E M Fries, P Fritschel, V V Frolov, P Fulda, M Fyffe, H Gabbard, B U Gadre, S M Gaebel, J R Gair, L Gammaitoni, S G Gaonkar, F Garufi, G Gaur, V Gayathri, N Gehrels, G Gemme, E Genin, A Gennai, J George, L Gergely, V Germain, S Ghonge, Abhirup Ghosh, Archisman Ghosh, S Ghosh, J A Giaime, K D Giardina, A Giazotto, K Gill, A Glaefke, E Goetz, R Goetz, L Gondan, G González, J M Gonzalez Castro, A Gopakumar, M L Gorodetsky, S E Gossan, M Gosselin, R Gouaty, A Grado, C Graef, M Granata, A Grant, S Gras, C Gray, G Greco, A C Green, P Groot, H Grote, S Grunewald, G M Guidi, X Guo, A Gupta, M K Gupta, K E Gushwa, E K Gustafson, R Gustafson, J J Hacker, B R Hall, E D Hall, G Hammond, M Haney, M M Hanke, J Hanks, C Hanna, M D Hannam, J Hanson, T Hardwick, J Harms, G M Harry, I W Harry, M J Hart, M T Hartman, C-J Haster, K Haughian, J Healy, A Heidmann, M C Heintze, H Heitmann, P Hello, G Hemming, M Hendry, I S Heng, J Hennig, J Henry, A W Heptonstall, M Heurs, S Hild, D Hoak, D Hofman, K Holt, D E Holz, P Hopkins, J Hough, E A Houston, E J Howell, Y M Hu, E A Huerta, D Huet, B Hughey, S Husa, S H Huttner, T Huynh-Dinh, N Indik, D R Ingram, R Inta, H N Isa, J-M Isac, M Isi, T Isogai, B R Iyer, K Izumi, T Jacqmin, K Jani, P Jaranowski, S Jawahar, F Jiménez-Forteza, W W Johnson, D I Jones, R Jones, R J G Jonker, L Ju, J Junker, C V Kalaghatgi, V Kalogera, S Kandhasamy, G Kang, J B Kanner, S Karki, K S Karvinen, M Kasprzack, E Katsavounidis, W Katzman, S Kaufer, T Kaur, K Kawabe, F Kéfélian, D Keitel, D B Kelley, R Kennedy, J S Key, F Y Khalili, I Khan, S Khan, Z Khan, E A Khazanov, N Kijbunchoo, Chunglee Kim, J C Kim, Whansun Kim, W Kim, Y-M Kim, S J Kimbrell, E J King, P J King, R Kirchhoff, J S Kissel, B Klein, L Kleybolte, S Klimenko, P Koch, S M Koehlenbeck, S Koley, V Kondrashov, A Kontos, M Korobko, W Z Korth, I Kowalska, D B Kozak, C Krämer, V Kringel, A Królak, G Kuehn, P Kumar, R Kumar, L Kuo, A Kutynia, B D Lackey, M Landry, R N Lang, J Lange, B Lantz, R K Lanza, A Lartaux-Vollard, P D Lasky, M Laxen, A Lazzarini, C Lazzaro, P Leaci, S Leavey, E O Lebigot, C H Lee, H K Lee, H M Lee, K Lee, J Lehmann, A Lenon, M Leonardi, J R Leong, N Leroy, N Letendre, Y Levin, T G F Li, A Libson, T B Littenberg, J Liu, N A Lockerbie, A L Lombardi, L T London, J E Lord, M Lorenzini, V Loriette, M Lormand, G Losurdo, J D Lough, G Lovelace, H Lück, A P Lundgren, R Lynch, Y Ma, S Macfoy, B Machenschalk, M MacInnis, D M Macleod, F Magaña-Sandoval, E Majorana, I Maksimovic, V Malvezzi, N Man, V Mandic, V Mangano, G L Mansell, M Manske, M Mantovani, F Marchesoni, F Marion, S Márka, Z Márka, A S Markosyan, E Maros, F Martelli, L Martellini, I W Martin, D V Martynov, K Mason, A Masserot, T J Massinger, M Masso-Reid, S Mastrogiovanni, A Matas, F Matichard, L Matone, N Mavalvala, N Mazumder, R McCarthy, D E McClelland, S McCormick, C McGrath, S C McGuire, G McIntyre, J McIver, D J McManus, T McRae, S T McWilliams, D Meacher, G D Meadors, J Meidam, A Melatos, G Mendell, D Mendoza-Gandara, R A Mercer, E L Merilh, M Merzougui, S Meshkov, C Messenger, C Messick, R Metzdorff, P M Meyers, F Mezzani, H Miao, C Michel, H Middleton, E E Mikhailov, L Milano, A L Miller, A Miller, B B Miller, J Miller, M Millhouse, Y Minenkov, J Ming, S Mirshekari, C Mishra, S Mitra, V P Mitrofanov, G Mitselmakher, R Mittleman, A Moggi, M Mohan, S R P Mohapatra, M Montani, B C Moore, C J Moore, D Moraru, G Moreno, S R Morriss, B Mours, C M Mow-Lowry, G Mueller, A W Muir, Arunava Mukherjee, D Mukherjee, S Mukherjee, N Mukund, A Mullavey, J Munch, E A M Muniz, P G Murray, A Mytidis, K Napier, I Nardecchia, L Naticchioni, G Nelemans, T J N Nelson, M Neri, M Nery, A Neunzert, J M Newport, G Newton, T T Nguyen, A B Nielsen, S Nissanke, A Nitz, A Noack, F Nocera, D Nolting, M E N Normandin, L K Nuttall, J Oberling, E Ochsner, E Oelker, G H Ogin, J J Oh, S H Oh, F Ohme, M Oliver, P Oppermann, Richard J Oram, B O'Reilly, R O'Shaughnessy, D J Ottaway, H Overmier, B J Owen, A E Pace, J Page, A Pai, S A Pai, J R Palamos, O Palashov, C Palomba, A Pal-Singh, H Pan, C Pankow, F Pannarale, B C Pant, F Paoletti, A Paoli, M A Papa, H R Paris, W Parker, D Pascucci, A Pasqualetti, R Passaquieti, D Passuello, B Patricelli, B L Pearlstone, M Pedraza, R Pedurand, L Pekowsky, A Pele, S Penn, C J Perez, A Perreca, L M Perri, H P Pfeiffer, M Phelps, O J Piccinni, M Pichot, F Piergiovanni, V Pierro, G Pillant, L Pinard, I M Pinto, M Pitkin, M Poe, R Poggiani, P Popolizio, A Post, J Powell, J Prasad, J W W Pratt, V Predoi, T Prestegard, M Prijatelj, M Principe, S Privitera, G A Prodi, L G Prokhorov, O Puncken, M Punturo, P Puppo, M Pürrer, H Qi, J Qin, S Qiu, V Quetschke, E A Quintero, R Quitzow-James, F J Raab, D S Rabeling, H Radkins, P Raffai, S Raja, C Rajan, M Rakhmanov, P Rapagnani, V Raymond, M Razzano, V Re, J Read, T Regimbau, L Rei, S Reid, D H Reitze, H Rew, S D Reyes, E Rhoades, F Ricci, K Riles, M Rizzo, N A Robertson, R Robie, F Robinet, A Rocchi, L Rolland, J G Rollins, V J Roma, J D Romano, R Romano, J H Romie, D Rosińska, S Rowan, A Rüdiger, P Ruggi, K Ryan, S Sachdev, T Sadecki, L Sadeghian, M Sakellariadou, L Salconi, M Saleem, F Salemi, A Samajdar, L Sammut, L M Sampson, E J Sanchez, V Sandberg, J R Sanders, B Sassolas, B S Sathyaprakash, P R Saulson, O Sauter, R L Savage, A Sawadsky, P Schale, J Scheuer, S Schlassa, E Schmidt, J Schmidt, P Schmidt, R Schnabel, R M S Schofield, A Schönbeck, E Schreiber, D Schuette, B F Schutz, S G Schwalbe, J Scott, S M Scott, D Sellers, A S Sengupta, D Sentenac, V Sequino, A Sergeev, Y Setyawati, D A Shaddock, T J Shaffer, M S Shahriar, B Shapiro, P Shawhan, A Sheperd, D H Shoemaker, D M Shoemaker, K Siellez, X Siemens, M Sieniawska, D Sigg, A D Silva, A Singer, L P Singer, A Singh, R Singh, A Singhal, A M Sintes, B J J Slagmolen, B Smith, J R Smith, R J E Smith, E J Son, B Sorazu, F Sorrentino, T Souradeep, A P Spencer, A K Srivastava, A Staley, M Steinke, J Steinlechner, S Steinlechner, D Steinmeyer, B C Stephens, S P Stevenson, R Stone, K A Strain, N Straniero, G Stratta, S E Strigin, R Sturani, A L Stuver, T Z Summerscales, L Sun, S Sunil, P J Sutton, B L Swinkels, M J Szczepańczyk, M Tacca, D Talukder, D B Tanner, D Tao, M Tápai, A Taracchini, R Taylor, T Theeg, E G Thomas, M Thomas, P Thomas, K A Thorne, E Thrane, T Tippens, S Tiwari, V Tiwari, K V Tokmakov, K Toland, C Tomlinson, M Tonelli, Z Tornasi, C I Torrie, D Töyrä, F Travasso, G Traylor, D Trifirò, J Trinastic, M C Tringali, L Trozzo, M Tse, R Tso, M Turconi, D Tuyenbayev, D Ugolini, C S Unnikrishnan, A L Urban, S A Usman, H Vahlbruch, G Vajente, G Valdes, N van Bakel, M van Beuzekom, J F J van den Brand, C Van Den Broeck, D C Vander-Hyde, L van der Schaaf, J V van Heijningen, A A van Veggel, M Vardaro, V Varma, S Vass, M Vasúth, A Vecchio, G Vedovato, J Veitch, P J Veitch, K Venkateswara, G Venugopalan, D Verkindt, F Vetrano, A Viceré, A D Viets, S Vinciguerra, D J Vine, J-Y Vinet, S Vitale, T Vo, H Vocca, C Vorvick, D V Voss, W D Vousden, S P Vyatchanin, A R Wade, L E Wade, M Wade, M Walker, L Wallace, S Walsh, G Wang, H Wang, M Wang, Y Wang, R L Ward, J Warner, M Was, J Watchi, B Weaver, L-W Wei, M Weinert, A J Weinstein, R Weiss, L Wen, P Weßels, T Westphal, K Wette, J T Whelan, B F Whiting, C Whittle, D Williams, R D Williams, A R Williamson, J L Willis, B Willke, M H Wimmer, W Winkler, C C Wipf, H Wittel, G Woan, J Woehler, J Worden, J L Wright, D S Wu, G Wu, W Yam, H Yamamoto, C C Yancey, M J Yap, Hang Yu, Haocun Yu, M Yvert, A Zadrożny, L Zangrando, M Zanolin, J-P Zendri, M Zevin, L Zhang, M Zhang, T Zhang, Y Zhang, C Zhao, M Zhou, Z Zhou, S J Zhu, X J Zhu, M E Zucker, J Zweizig
A wide variety of astrophysical and cosmological sources are expected to contribute to a stochastic gravitational-wave background. Following the observations of GW150914 and GW151226, the rate and mass of coalescing binary black holes appear to be greater than many previous expectations. As a result, the stochastic background from unresolved compact binary coalescences is expected to be particularly loud. We perform a search for the isotropic stochastic gravitational-wave background using data from Advanced Laser Interferometer Gravitational Wave Observatory's (aLIGO) first observing run...
March 24, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28378739/formation-of-the-first-three-gravitational-wave-observations-through-isolated-binary-evolution
#8
Simon Stevenson, Alejandro Vigna-Gómez, Ilya Mandel, Jim W Barrett, Coenraad J Neijssel, David Perkins, Selma E de Mink
During its first four months of taking data, Advanced LIGO has detected gravitational waves from two binary black hole mergers, GW150914 and GW151226, along with the statistically less significant binary black hole merger candidate LVT151012. Here we use the rapid binary population synthesis code COMPAS to show that all three events can be explained by a single evolutionary channel-classical isolated binary evolution via mass transfer including a common envelope phase. We show all three events could have formed in low-metallicity environments (Z=0...
April 5, 2017: Nature Communications
https://www.readbyqxmd.com/read/28372094/vibration-damping-using-a-spiral-acoustic-black-hole
#9
Jae Yeon Lee, Wonju Jeon
This study starts with a simple question: can the vibration of plates or beams be efficiently reduced using a lightweight structure that occupies a small space? As an efficient technique to damp vibration, the concept of an acoustic black hole (ABH) is adopted with a simple modification of the geometry. The original shape of an ABH is a straight wedge-type profile with power-law thickness, with the reduction of vibration in beams or plates increasing as the length of the ABH increases. However, in real-world applications, there exists an upper bound of the length of an ABH due to space limitations...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28370651/tracking-the-evolution-of-cerebral-gadolinium-enhancing-lesions-to-persistent-t1-black-holes-in-multiple-sclerosis-validation-of-a-semiautomated-pipeline
#10
Simon Andermatt, Athina Papadopoulou, Ernst-Wilhelm Radue, Till Sprenger, Philippe Cattin
BACKGROUND: Some gadolinium-enhancing multiple sclerosis (MS) lesions remain T1-hypointense over months ("persistent black holes, BHs") and represent areas of pronounced tissue loss. A reduced conversion of enhancing lesions to persistent BHs could suggest a favorable effect of a medication on tissue repair. However, the individual tracking of enhancing lesions can be very time-consuming in large clinical trials. PURPOSE: We created a semiautomated workflow for tracking the evolution of individual MS lesions, to calculate the proportion of enhancing lesions becoming persistent BHs at follow-up...
March 30, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28332538/how-to-hunt-for-a-black-hole-with-a-telescope-the-size-of-earth
#11
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
#12
(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
#13
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
#14
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
#15
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
#16
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
#17
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 21, 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
#18
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
#19
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
#20
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
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