keyword
MENU ▼
Read by QxMD icon Read
search

Gravitation

keyword
https://www.readbyqxmd.com/read/28641686/a-case-study-of-human-roll-tilt-perception-in-hypogravity
#1
Torin K Clark, Laurence R Young
BACKGROUND: Increased gravito-inertial acceleration, or hypergravity, such as produced in a centrifuge or in an aircraft coordinated turn, causes humans to systematically overestimate their roll tilt in the dark. This is known as the "G-excess" illusion. We have previously modified a mathematical observer model of dynamic orientation perception to replicate these illusory tilt perceptions. This modified model also made a novel, previously untested, prediction that humans would underestimate acute roll tilt in reduced gravitational environments (hypogravity)...
July 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28641036/modelling-error-distribution-in-the-ground-reaction-force-during-an-induced-acceleration-analysis-of-running-in-rear-foot-strikers
#2
Sekiya Koike, Seigo Nakaya, Hiroto Mori, Tatsuya Ishikawa, Alexander P Willmott
The objective of this study was to develop and evaluate a methodology for quantifying the contributions of modelling error terms, as well as individual joint torque, gravitational force and motion-dependent terms, to the generation of ground reaction force (GRF), whose true value can be measured with high accuracy using a force platform. Dynamic contributions to the GRF were derived from the combination of (1) the equations of motion for the individual segments, (2) the equations for constraint conditions arising from the connection of adjacent segments at joints, and (3) the equations for anatomical constraint axes at certain joints...
June 22, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28640271/a-massive-dead-disk-galaxy-in-the-early-universe
#3
Sune Toft, Johannes Zabl, Johan Richard, Anna Gallazzi, Stefano Zibetti, Moire Prescott, Claudio Grillo, Allison W S Man, Nicholas Y Lee, Carlos Gómez-Guijarro, Mikkel Stockmann, Georgios Magdis, Charles L Steinhardt
At redshift z = 2, when the Universe was just three billion years old, half of the most massive galaxies were extremely compact and had already exhausted their fuel for star formation. It is believed that they were formed in intense nuclear starbursts and that they ultimately grew into the most massive local elliptical galaxies seen today, through mergers with minor companions, but validating this picture requires higher-resolution observations of their centres than is currently possible. Magnification from gravitational lensing offers an opportunity to resolve the inner regions of galaxies...
June 21, 2017: Nature
https://www.readbyqxmd.com/read/28633298/protein-expression-in-tension-wood-formation-monitored-at-high-tissue-resolution-in-populus
#4
Joakim Bygdell, Vaibhav Srivastava, Ogonna Obudulu, Manoj K Srivastava, Robert Nilsson, Björn Sundberg, Johan Trygg, Ewa J Mellerowicz, Gunnar Wingsle
Tension wood (TW) is a specialized tissue with contractile properties that is formed by the vascular cambium in response to gravitational stimuli. We quantitatively analysed the proteomes of Populus tremula cambium and its xylem cell derivatives in stems forming normal wood (NW) and TW to reveal the mechanisms underlying TW formation. Phloem-, cambium-, and wood-forming tissues were sampled by tangential cryosectioning and pooled into nine independent samples. The proteomes of TW and NW samples were similar in the phloem and cambium samples, but diverged early during xylogenesis, demonstrating that reprogramming is an integral part of TW formation...
June 13, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28621973/gw170104-observation-of-a-50-solar-mass-binary-black-hole-coalescence-at-redshift-0-2
#5
B P Abbott, R Abbott, T D Abbott, F Acernese, K Ackley, C Adams, T Adams, P Addesso, R X Adhikari, V B Adya, C Affeldt, M Afrough, B Agarwal, M Agathos, K Agatsuma, N Aggarwal, O D Aguiar, L Aiello, A Ain, P Ajith, B Allen, G Allen, A Allocca, P A Altin, A Amato, A Ananyeva, S B Anderson, W G Anderson, S Antier, 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, K AultONeal, A Avila-Alvarez, S Babak, P Bacon, M K M Bader, S Bae, P T Baker, F Baldaccini, G Ballardin, S W Ballmer, S Banagiri, 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, M Bawaj, M Bazzan, B Bécsy, C Beer, M Bejger, I Belahcene, 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 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, N Bode, 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, M Canepa, P Canizares, K C Cannon, H Cao, J Cao, C D Capano, E Capocasa, F Carbognani, S Caride, M F Carney, 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, D Chatterjee, K Chatziioannou, 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, A K W Chung, S Chung, G Ciani, R Ciolfi, C E Cirelli, A Cirone, F Clara, J A Clark, F Cleva, C Cocchieri, E Coccia, P-F Cohadon, A Colla, C G Collette, L R Cominsky, M Constancio, L Conti, S J Cooper, P Corban, T R Corbitt, K R Corley, N Cornish, A Corsi, S Cortese, C A Costa, 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, D Davis, E J Daw, B Day, S De, D DeBra, E Deelman, 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, F Di Renzo, 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, J Duncan, S E Dwyer, T B Edo, M C Edwards, A Effler, H-B Eggenstein, P Ehrens, J Eichholz, S S Eikenberry, R A Eisenstein, R C Essick, Z B Etienne, T Etzel, M Evans, T M Evans, 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, J Feicht, M M Fejer, A Fernandez-Galiana, I Ferrante, E C Ferreira, F Ferrini, F Fidecaro, I Fiori, D Fiorucci, R P Fisher, R Flaminio, M Fletcher, H Fong, P W F Forsyth, 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, M Gabel, B U Gadre, S M Gaebel, J R Gair, L Gammaitoni, M R Ganija, S G Gaonkar, F Garufi, S Gaudio, G Gaur, V Gayathri, N Gehrels, G Gemme, E Genin, A Gennai, D George, J George, L Gergely, V Germain, S Ghonge, Abhirup Ghosh, Archisman Ghosh, S Ghosh, J A Giaime, K D Giardina, A Giazotto, K Gill, L Glover, E Goetz, R Goetz, S Gomes, 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, P Gruning, G M Guidi, X Guo, A Gupta, M K Gupta, K E Gushwa, E K Gustafson, R Gustafson, B R Hall, E D Hall, G Hammond, M Haney, M M Hanke, J Hanks, C Hanna, M D Hannam, O A Hannuksela, J Hanson, T Hardwick, J Harms, G M Harry, I W Harry, M J Hart, 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, C Horst, 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, G Intini, H N Isa, J-M Isac, M Isi, B R Iyer, K Izumi, T Jacqmin, K Jani, P Jaranowski, S Jawahar, F Jiménez-Forteza, W W Johnson, N K Johnson-McDaniel, 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, M Katolik, E Katsavounidis, W Katzman, S Kaufer, K Kawabe, F Kéfélian, D Keitel, A J Kemball, R Kennedy, C Kent, J S Key, F Y Khalili, I Khan, S Khan, Z Khan, E A Khazanov, N Kijbunchoo, Chunglee Kim, J C Kim, W Kim, W S Kim, Y-M Kim, S J Kimbrell, E J King, P J King, R Kirchhoff, J S Kissel, 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, B Krishnan, A Królak, G Kuehn, P Kumar, R Kumar, S Kumar, L Kuo, A Kutynia, S Kwang, B D Lackey, K H Lai, 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, C H Lee, H K Lee, H M Lee, H W Lee, K Lee, J Lehmann, A Lenon, M Leonardi, N Leroy, N Letendre, Y Levin, T G F Li, A Libson, T B Littenberg, J Liu, R K L Lo, N A Lockerbie, L T London, J E Lord, M Lorenzini, V Loriette, M Lormand, G Losurdo, J D Lough, G Lovelace, H Lück, D Lumaca, A P Lundgren, R Lynch, Y Ma, S Macfoy, B Machenschalk, M MacInnis, D M Macleod, I Magaña Hernandez, F Magaña-Sandoval, L Magaña Zertuche, R M Magee, E Majorana, I Maksimovic, N Man, V Mandic, V Mangano, G L Mansell, M Manske, M Mantovani, F Marchesoni, F Marion, S Márka, Z Márka, C Markakis, A S Markosyan, E Maros, F Martelli, L Martellini, I W Martin, D V Martynov, J N Marx, K Mason, A Masserot, T J Massinger, M Masso-Reid, S Mastrogiovanni, A Matas, F Matichard, L Matone, N Mavalvala, R Mayani, N Mazumder, R McCarthy, D E McClelland, S McCormick, L McCuller, S C McGuire, G McIntyre, J McIver, D J McManus, T McRae, S T McWilliams, D Meacher, G D Meadors, J Meidam, E Mejuto-Villa, A Melatos, G Mendell, 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, O Minazzoli, Y Minenkov, J Ming, 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, K Napier, I Nardecchia, L Naticchioni, R K Nayak, G Nelemans, T J N Nelson, M Neri, M Nery, A Neunzert, J M Newport, G Newton, K K Y Ng, T T Nguyen, D Nichols, 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 Ormiston, L F Ortega, R O'Shaughnessy, D J Ottaway, H Overmier, B J Owen, A E Pace, J Page, M A Page, A Pai, S A Pai, J R Palamos, O Palashov, C Palomba, A Pal-Singh, H Pan, B Pang, P T H Pang, 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, R Poggiani, P Popolizio, E K Porter, 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, K E Ramirez, P Rapagnani, V Raymond, M Razzano, J Read, T Regimbau, L Rei, S Reid, D H Reitze, H Rew, S D Reyes, F Ricci, P M Ricker, S Rieger, 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, C L Romel, J H Romie, D Rosińska, M P Ross, S Rowan, A Rüdiger, P Ruggi, K Ryan, M Rynge, 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, B Sandeen, J R Sanders, B Sassolas, B S Sathyaprakash, P R Saulson, O Sauter, R L Savage, A Sawadsky, P Schale, J Scheuer, E Schmidt, J Schmidt, P Schmidt, R Schnabel, R M S Schofield, A Schönbeck, E Schreiber, D Schuette, B W Schulte, B F Schutz, S G Schwalbe, J Scott, S M Scott, E Seidel, D Sellers, A S Sengupta, D Sentenac, V Sequino, A Sergeev, D A Shaddock, T J Shaffer, A A Shah, M S Shahriar, L Shao, 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, J A Sonnenberg, 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, 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, M Tápai, A Taracchini, J A Taylor, R Taylor, T Theeg, E G Thomas, M Thomas, P Thomas, K A Thorne, K S Thorne, E Thrane, S Tiwari, V Tiwari, K V Tokmakov, K Toland, M Tonelli, Z Tornasi, C I Torrie, D Töyrä, F Travasso, G Traylor, D Trifirò, J Trinastic, M C Tringali, L Trozzo, K W Tsang, M Tse, R Tso, D Tuyenbayev, K Ueno, D Ugolini, C S Unnikrishnan, A L Urban, S A Usman, K Vahi, H Vahlbruch, G Vajente, G Valdes, M Vallisneri, 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, R M Wald, R Walet, M Walker, L Wallace, S Walsh, G Wang, H Wang, J Z Wang, M Wang, Y-F 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, E K Wessel, 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 Wofford, K W K Wong, 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, M Zanolin, T Zelenova, J-P Zendri, M Zevin, L Zhang, M Zhang, T Zhang, Y-H Zhang, C Zhao, M Zhou, Z Zhou, X J Zhu, A Zimmerman, M E Zucker, J Zweizig
We describe the observation of GW170104, a gravitational-wave signal produced by the coalescence of a pair of stellar-mass black holes. The signal was measured on January 4, 2017 at 10∶11:58.6 UTC by the twin advanced detectors of the Laser Interferometer Gravitational-Wave Observatory during their second observing run, with a network signal-to-noise ratio of 13 and a false alarm rate less than 1 in 70 000 years. The inferred component black hole masses are 31.2_{-6.0}^{+8.4}M_{⊙} and 19.4_{-5.9}^{+5...
June 2, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28619209/gravitating-towards-universal-health-coverage-in-the-new-who-era
#6
EDITORIAL
The Lancet Global Health
No abstract text is available yet for this article.
July 2017: Lancet Global Health
https://www.readbyqxmd.com/read/28616247/planarian-regeneration-in-space-persistent-anatomical-behavioral-and-bacteriological-changes-induced-by-space-travel
#7
Junji Morokuma, Fallon Durant, Katherine B Williams, Joshua M Finkelstein, Douglas J Blackiston, Twyman Clements, David W Reed, Michael Roberts, Mahendra Jain, Kris Kimel, Sunia A Trauger, Benjamin E Wolfe, Michael Levin
Regeneration is regulated not only by chemical signals but also by physical processes, such as bioelectric gradients. How these may change in the absence of the normal gravitational and geomagnetic fields is largely unknown. Planarian flatworms were moved to the International Space Station for 5 weeks, immediately after removing their heads and tails. A control group in spring water remained on Earth. No manipulation of the planaria occurred while they were in orbit, and space-exposed worms were returned to our laboratory for analysis...
April 2017: Regeneration
https://www.readbyqxmd.com/read/28609620/imparting-icephobicity-with-substrate-flexibility
#8
Thomas Vasileiou, Thomas M Schutzius, Dimos Poulikakos
Ice accumulation hinders the performance of, and poses safety threats for infrastructure both on the ground and in the air. Previously, rationally designed superhydrophobic surfaces have demonstrated some potential as a passive means to mitigate ice accretion; however, further studies on material solutions that reduce impalement and contact time for impacting supercooled droplets (high viscosity) and can also repel droplets that freeze during surface contact are urgently needed. Here we demonstrate the collaborative effect of substrate flexibility and surface micro/nanotexture on enhancing both icephobicity and the repellency of viscous droplets (typical of supercooled water)...
June 13, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28608779/cerebellar-re-encoding-of-self-generated-head-movements
#9
Guillaume P Dugué, Matthieu Tihy, Boris Gourévitch, Clément Léna
Head movements are primarily sensed in a reference frame tied to the head, yet they are used to calculate self-orientation relative to the world. This requires to re-encode head kinematic signals into a reference frame anchored to earth-centered landmarks such as gravity, through computations whose neuronal substrate remains to be determined. Here, we studied the encoding of self-generated head movements in the rat caudal cerebellar vermis, an area essential for graviceptive functions. We found that, contrarily to peripheral vestibular inputs, most Purkinje cells exhibited a mixed sensitivity to head rotational and gravitational information and were differentially modulated by active and passive movements...
June 13, 2017: ELife
https://www.readbyqxmd.com/read/28607486/a-retinal-code-for-motion-along-the-gravitational-and-body-axes
#10
Shai Sabbah, John A Gemmer, Ananya Bhatia-Lin, Gabrielle Manoff, Gabriel Castro, Jesse K Siegel, Nathan Jeffery, David M Berson
Self-motion triggers complementary visual and vestibular reflexes supporting image-stabilization and balance. Translation through space produces one global pattern of retinal image motion (optic flow), rotation another. We examined the direction preferences of direction-sensitive ganglion cells (DSGCs) in flattened mouse retinas in vitro. Here we show that for each subtype of DSGC, direction preference varies topographically so as to align with specific translatory optic flow fields, creating a neural ensemble tuned for a specific direction of motion through space...
June 7, 2017: Nature
https://www.readbyqxmd.com/read/28607373/intrinsic-functional-connectivity-reduces-after-first-time-exposure-to-short-term-gravitational-alterations-induced-by-parabolic-flight
#11
Angelique Van Ombergen, Floris L Wuyts, Ben Jeurissen, Jan Sijbers, Floris Vanhevel, Steven Jillings, Paul M Parizel, Stefan Sunaert, Paul H Van de Heyning, Vincent Dousset, Steven Laureys, Athena Demertzi
Spaceflight severely impacts the human body. However, little is known about how gravity and gravitational alterations affect the human brain. Here, we aimed at measuring the effects of acute exposure to gravity transitions. We exposed 28 naïve participants to repetitive alterations between normal, hyper- and microgravity induced by a parabolic flight (PF) and measured functional MRI connectivity changes. Scans were acquired before and after the PF. To mitigate motion sickness, PF participants received scopolamine prior to PF...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28598651/testing-general-relativity-with-stellar-orbits-around-the-supermassive-black-hole-in-our-galactic-center
#12
A Hees, T Do, A M Ghez, G D Martinez, S Naoz, E E Becklin, A Boehle, S Chappell, D Chu, A Dehghanfar, K Kosmo, J R Lu, K Matthews, M R Morris, S Sakai, R Schödel, G Witzel
We demonstrate that short-period stars orbiting around the supermassive black hole in our Galactic center can successfully be used to probe the gravitational theory in a strong regime. We use 19 years of observations of the two best measured short-period stars orbiting our Galactic center to constrain a hypothetical fifth force that arises in various scenarios motivated by the development of a unification theory or in some models of dark matter and dark energy. No deviation from general relativity is reported and the fifth force strength is restricted to an upper 95% confidence limit of |α|<0...
May 26, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28598367/pattern-evolution-during-double-liquid-vapor-phase-transitions-under-weightlessness
#13
Ana Oprisan, Yves Garrabos, Carole Lecoutre, Daniel Beysens
Phase transition in fluids is ubiquitous in nature and has important applications in areas such as the food industry for volatile oils' extraction or in nuclear plants for heat transfer. Fundamentals are hampered by gravity effects on Earth. We used direct imaging to record snapshots of phase separation that takes place in sulfur hexafluoride, SF₆, under weightlessness conditions on the International Space Station (ISS). The system was already at liquid-vapor equilibrium slightly below the critical temperature and further cooled down by a 0...
June 9, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28598155/dissolution-trapping-of-carbon-dioxide-in-heterogeneous-aquifers
#14
Mohamad Reza Soltanian, Mohammad Amin Amooie, Naum Gershenzon, Zhenxue Dai, Robert Ritzi, Fengyang Xiong, David Cole, Joachim Moortgat
The geologic architecture in sedimentary reservoirs affects the behavior of density-driven flow and the dispersion of CO2-rich brine. The spatial organization and connectivity of facies types play an important role. Low-permeability facies may suppress fingering and reduce vertical spreading, but may also increase transverse mixing. This is more pronounced when geologic structures create preferential flow pathways through connected facies types. We perform high-resolution simulations of three-dimensional (3D) heterogeneous formations whose connectivity cannot be represented in two-dimensional models consistent with percolation theory...
June 16, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28597701/upper-limb-and-eye-movement-coordination-during-reaching-tasks-in-people-with-stroke
#15
Katie L Meadmore, Timothy A Exell, Jane H Burridge, Ann-Marie Hughes, Christopher T Freeman, Valerie Benson
PURPOSE: To enhance understanding of the relationship between upper limb and eye movements during reaching tasks in people with stroke. METHODS: Eye movements were recorded from 10 control participants and 8 chronic stroke participants during a visual orienting task (Experiment 1) and a series of reaching tasks (Experiment 2). Stroke participants completed the reaching tasks using (i) their less impaired upper limb, (ii) their more impaired upper limb without support, and (iii) their more impaired upper limb, with support (SaeboMAS gravitational support and/or electrical stimulation)...
June 9, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28595451/dependent-erythema-of-the-legs-associated-with-mild-autonomic-nervous-system-dysfunction
#16
Bahar Bahrani, Christopher S Sladden
INTRODUCTION: Dependent erythema or rubor is an erythematous discoloration of the limbs, most commonly associated with peripheral artery disease. We present a case of florid dependent erythema, associated with additional autonomic symptoms. METHODS: Examination and full workup of a 16-year-old healthy girl with an 8-year history of dependent erythema, chronic diarrhea, and mild hyperhidrosis. A literature search was performed to review any similar cases and generate a differential diagnosis...
June 1, 2017: Journal of Cutaneous Medicine and Surgery
https://www.readbyqxmd.com/read/28595403/colloidal-diffusion-over-a-quasicrystalline-patterned-surface
#17
Yun Su, Pik-Yin Lai, Bruce J Ackerson, Xin Cao, Yilong Han, Penger Tong
We report a systematic study of colloidal diffusion over a substrate with quasicrystalline-patterned holes. Silica spheres of diameter comparable to the hole diameter diffuse over the patterned substrate and experience a gravitational potential U(x, y). Using optical microscopy, we track the particle trajectories and find two distinct states: a trapped state when the particles are inside the holes and a free-diffusion state when they are on the flat surface outside the holes. The potential U(x, y) and dynamic properties of the diffusing particle, such as its mean dwell time, mean square displacement, and long-time diffusion coefficient DL, are measured simultaneously...
June 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28592430/relativistic-deflection-of-background-starlight-measures-the-mass-of-a-nearby-white-dwarf-star
#18
Kailash C Sahu, Jay Anderson, Stefano Casertano, Howard E Bond, Pierre Bergeron, Edmund P Nelan, Laurent Pueyo, Thomas M Brown, Andrea Bellini, Zoltan G Levay, Joshua Sokol, Martin Dominik, Annalisa Calamida, Noé Kains, Mario Livio
Gravitational deflection of starlight around the Sun during the 1919 total solar eclipse provided measurements that confirmed Einstein's general theory of relativity. We have used the Hubble Space Telescope to measure the analogous process of astrometric microlensing caused by a nearby star, the white dwarf Stein 2051 B. As Stein 2051 B passed closely in front of a background star, the background star's position was deflected. Measurement of this deflection at multiple epochs allowed us to determine the mass of Stein 2051 B-the sixth-nearest white dwarf to the Sun-as 0...
June 9, 2017: Science
https://www.readbyqxmd.com/read/28587086/evaluation-and-comparison-of-the-processing-methods-of-airborne-gravimetry-concerning-the-errors-effects-on-downward-continuation-results-case-studies-in-louisiana-usa-and-the-tibetan-plateau-china
#19
Qilong Zhao, Gabriel Strykowski, Jiancheng Li, Xiong Pan, Xinyu Xu
Gravity data gaps in mountainous areas are nowadays often filled in with the data from airborne gravity surveys. Because of the errors caused by the airborne gravimeter sensors, and because of rough flight conditions, such errors cannot be completely eliminated. The precision of the gravity disturbances generated by the airborne gravimetry is around 3-5 mgal. A major obstacle in using airborne gravimetry are the errors caused by the downward continuation. In order to improve the results the external high-accuracy gravity information e...
May 25, 2017: Sensors
https://www.readbyqxmd.com/read/28585922/information-loss
#20
William Unruh, Robert M Wald
The complete gravitational collapse of a body in general relativity will result in the formation of a black hole. Although the black hole is classically stable, quantum particle creation processes will result in the emission of Hawking radiation to infinity and corresponding mass loss of the black hole, eventually resulting in the complete evaporation of the black hole. Semiclassical arguments strongly suggest that, in the process of black hole formation and evaporation, a pure quantum state will evolve to a mixed state, i...
June 6, 2017: Reports on Progress in Physics
keyword
keyword
34917
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"