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first_imgArsenal legend David Seaman has advised Arsene Wenger NOT to launch a bid for Petr Cech.The Gunners are reportedly lining up a £7million swoop for the out-of-favour Chelsea goalkeeper in the January transfer window.But Seaman is against the move as he wants Wenger to keep faith with Wojciech Szczesny.Speaking on the Alan Brazil Sports Breakfast, the club’s legendary former stopper said: “Wojciech is coming off his best season last season with Arsenal and I don’t think that anybody warrants taking his place because he is not making mistakes.“Arsenal are conceding goals, but it is not through goalkeeping errors that they are conceding.”Arsenal have lost more more points from winning positions than any other Premier League side this season, and are sitting sixth in the table ahead of Saturday’s visit of Manchester United.Seaman insists that has little to do with Szczesny and is instead down to a lack of leadership throughout the team.He added: “They have not got anybody in the team at the moment that can grab a game and think, right, we are 2-0 up or 3-0 up, let’s sit in front of the back four, see ten minutes out so we don’t concede a goal, and then push on from there. We used to do that with Patrick Vieira. Tony Adams or I would say, ‘Patrick, just sit in front of the defenders for ten minutes’.“You would think someone like Per Mertesacker would be good enough to do that because he has got tons of international experience. I don’t know how vocal he is in a game or how the other players are, but [Mathieu] Flamini looks like the only one doing it at the moment.”With Arsenal 11 points behind leaders Chelsea just 11 games into the season, Wenger has already given up hope of winning the title.Seaman insists it is too early to completely write off the Gunners, but admits their London rivals look to be on a different level.“They have got a slight chance. Chelsea are looking so good and so strong, but if Arsenal can get on one of their runs where they win a big group of games together then they can put a bit of pressure on,” he said.“At the moment Chelsea are almost in second gear and they have got three more gears to go.”last_img read more

first_imgDefender Virgil Van Dijk believes Liverpool are capable of mounting a challenge on both the domestic scene and EuropeThe Reds face a daunting task at home to Napoli on tonight in which they must emerge victorious either 1-0 or by two clear goals to avoid failing to progress beyond the Champions League group stage.“At Liverpool, there is always a lot of pressure, but it is good pressure,” the Holland captain revealed to Givemesport.“You want to play in these circumstances, a night like tomorrow. You want to be getting the job done before tomorrow – but now we are here.“I definitely look at the squad and think it can compete on two fronts. We still need to show it but I think we are definitely capable of competing in both competitions. Hopefully, that will be the case.”Roberto Firmino, LiverpoolVirgil van Dijk praises Roberto Firmino after Liverpool’s win Andrew Smyth – September 14, 2019 Virgil van Dijk hailed team-mate Roberto Firmino after coming off the bench to inspire Liverpool to a 3-1 comeback win against Newcastle United.Speaking about missing out in Europe’s premier competition, the former Saints defender confirmed it is not a scenario any of his team-mates are even considering.“That is something I am not even going to think about, so I won’t answer. Hopefully, that isn’t going to happen,” added the Dutchman, who rejected the suggestion going out of Europe altogether would be a blessing in disguise in terms of the title race.“I don’t think they are Liverpool fans (if they are saying that).“We want to compete on the highest level. We are top of the league now, but it could change next week. You never know.“The main thing for us is to stay on the highest level and to do everything we can to go through. It is going to be a tough game but I am very confident, like always in my team.last_img read more

first_img Explore further Physicists have investigated little-known solutions to Maxwell’s equations, in which light beams can be linked and knotted in various configurations. Credit: Irvine and Bouwmeester. ©2008 Nature. Citation: Physicists hope to tie light beams in knots (2008, September 12) retrieved 18 August 2019 from https://phys.org/news/2008-09-physicists_1.html Physicists William Irvine of New York University and Dirk Bouwmeester of the University of California, Santa Barbara, and Leiden University in The Netherlands have published a study in Nature Physics on their analysis of knotted light. The scientists looked at the physical properties of knotted light and discovered that it can be experimentally generated using circularly polarized laser beams.In some little-known solutions to Maxwell’s equations, all the electric and magnetic field lines form circles that are all linked to each other. These loops of field lines can be used to construct the donut shape of a torus. In such a scenario, each circle wraps around the torus once, and no two circles cross each other. Smaller tori could then be nested within larger ones, filling three-dimensional space with circles of light beams. These solutions differ from any known existing form of light because of the intricate knotted structure, the physicists told PhysOrg.com. As they explained, this structure is based on the Hopf fibration, which was introduced in 1931 to mathematically investigate the structure of spheres in four and higher dimensions, a topic that seemingly has nothing to do with light. After investigating knotted light’s properties, the physicists determined that they could use laser fields to create the structures. Starting with a single-pulsed beam of circularly polarized light, and tightly focusing the beam, it should be possible to create various shapes of looped light beams. By using holographic techniques and a spatial light modulator, the shape and profile of the looped light could also be controlled. These same techniques have recently been used to produce Airy beams, which are light beams that don’t spread out as they propagate.Currently the physicists are preparing for an experimental realization of the new solutions either using electromagnetic radiation in the optical regime, i.e. light, or in the microwave regime. The main challenge will be to deal with ultra-short pulses of radiation in order to create a broad spectrum of frequencies as needed for the construction of the light knots. Because knotted light beams have both beamlike properties and unique unexplored properties, the physicists predict that creating the beams could have applications in several areas. These could include applications in plasma confinement, atomic particle trapping, manipulating cold atomic ensembles, and generating soliton-like solutions in nonlinear media.More information: Irvine, William T. M. and Bouwmeester, Dirk. “Linked and knotted beams of light.” Nature Physics, Vol. 4, September 2008, pp. 716-720.Copyright 2008 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. Usually, light beams shine in a straight line, with the possible exception of light being bent by gravity. But scientists are now investigating how to make light beams into looped and knotted configurations. The possibility for these structured light beams arises from some curious solutions to Maxwell’s equations, which describe the fundamentals of electricity and magnetism. Multicolored light twists in new knotted ways This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.last_img read more

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