Tag: 开封桑拿

Video: Watch Cristiano Ronaldo’s record-breaking FIVE goals against Espanyol

first_img1 Cristiano Ronaldo celebrates scoring for Real Madrid Cristiano Ronaldo is Real Madrid all-time leading goalscorer in La Liga after netting FIVE goals against Espanyol.The Spanish giants romped to a 6-0 against their opponents with Karim Benzema getting the other strike of the match.Ronaldo’s stunning haul now takes him to 230, ahead of Spanish legend Raul [228] as Real Madrid’s top La Liga goalscorer of all-time.You can see all of the five goals below…last_img

Start reading Video: Watch Cristiano Ronaldo’s record-breaking FIVE goals against Espanyol

Summit Group announces bid to build carbon capture and storage plant in

first_img(PhysOrg.com) — For several years the government of the United Kingdom has been trying to build a low-carbon coal fired power plant by means of competitions between companies seeking the £1 billion reward that would go along with such a contract. The last go-round wound up with just one competitor, Scottish Power whose bid faltered in the end due to it being too expensive. This time an American conglomeration called the Summit Power Group has jumped into the fray by partnering with the National Grid, an electric and gas company that provides service to customers in the United Kingdom and parts of the United States and petroleum company Petrofac. Their idea is to build a Carbon Capture & Storage (CCS) coal fired power plant to be located in Scotland’s Port of Grangemouth, that Summit says will release 90% less carbon emissions than conventional plants. Explore further More information: Press release European power plants boosting coal use © 2011 PhysOrg.comcenter_img Citation: Summit Group announces bid to build carbon capture and storage plant in Scotland (2012, March 21) retrieved 18 August 2019 from https://phys.org/news/2012-03-summit-group-carbon-capture-storage.html Summit’s boast is not just marketing hype, they’re already in the middle of building a similar plant in Texas paid for by a grant from the US government.The bid for the plant is due to the UK’s Carbon Capture & Storage Delivery Competition. If built, the plant would be called the Caledonia Clean Energy Project, situated west of Edinburgh on the Firth of Forth; a location chosen due to already existing oil and gas pipeline facilities. In addition to using coal to create electricity, the plant would also produce hydrogen gas for sale to commercial customers. Also, because the location is close to the North Sea, the CO2 that is removed during the process of making electricity could be easily moved and sequestered under the sea for storage, by Petrofac which just happens to have a subsidiary company called CO2DeepStore that does just that.The group says that unlike Scottish Power, who estimated the project would cost £1.5 billion, they can get the job done for the £1 billion that the competition dictates. One possible hiccup thus far though is Summit’s plan to use the CO2 extracted, rather than sequester it, at a later date, as part of an enhanced oil recovery process under the North Sea, which has environmentalists worried.Summit also says that it is able to capture carbon during the process more efficiently than other plants because it doesn’t actually burn the coal used in the plant. Instead, they say, a chemical process is used. 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

Start reading Summit Group announces bid to build carbon capture and storage plant in

Lightmatter interaction can turn opaque materials transparent

Lightmatter interaction can turn opaque materials transparent

first_img 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. © 2014 Phys.org , arXiv Quantum holograms as atomic scale memory keepsake Explore further In a new study published in Physical Review Letters, researchers have developed a new method for manipulating light scattering. They theoretically show how to induce transparency in otherwise opaque materials using the complex dipole-dipole interactions present in a large number of interacting quantum emitters, such as atoms or molecules. This ability could have several potential applications, such as producing slow light or stopped light, along with applications in the field of attosecond physics.”The significance of our work is in the discovery of a very neat phenomenon (dipole-induced electromagnetic transparency [DIET]), which may be used to control light propagation in optically active media,” coauthor Eric Charron, Professor at the University of Paris-Sud in Orsay, France, told Phys.org. “We showed how light scattering by a nanometric size system, collectively responding through strongly coupled two-level atoms/molecules, can be manipulated by altering the material parameters: an otherwise opaque medium can be rendered transparent at any given frequency, by adequately adjusting the relative densities of the atoms/molecules composing it.”As the scientists explain, light scattering is very well understood when dealing with individual quantum emitters; that is, single atoms or molecules. But the physics becomes much more complex when dealing with two or more interacting emitters. In this case, the electromagnetic field experienced by an emitter depends not only on the light beam striking its surface, but also on all of the electromagnetic fields radiated by all of its neighbors, which in turn are affected by the emitter in question. Each quantum emitter can have a dipole, meaning a positive side and a negative side, due to an uneven distribution of electrons within the emitter. In a dense “vapor” of many quantum emitters, strong dipole-dipole couplings can then occur. The collective effects usually result in an enhancement of the light-matter interaction, although a very complicated one. Here, the researchers have theoretically shown that strong dipole-dipole interactions in a dense vapor of quantum emitters can be used to manipulate the spectral properties of the light scattered by the emitters. In particular, the medium may become transparent at a particular frequency that can be controlled to a certain extent. The scientists explain that, on the most basic level, DIET results from destructive interference between the electromagnetic waves emitted by the quantum emitters. DIET is also closely related to another phenomenon, called electromagnetically-induced transparency (EIT). EIT is also based on destructive interference, but it is induced by a laser instead of dipole-dipole interactions.The scientists expect that DIET could have many of the same applications as EIT, which include the generation of slow light or stopped light by interactions with the medium. Slow light has a variety of optical applications, including information transmission, switches, and high-resolution spectrometers. Also, in the field of attosecond physics, DIET could potentially be used to generate high harmonics in dense atomic or molecular gases.The researchers anticipate that DIET can be experimentally implemented in a few different ways, including in atomic vapor confined in a cell as well as in ultracold dense atomic clouds. However, both systems still face challenges for demonstrating DIET, which must be addressed in the future.”Currently our goal is to hunt for the observation of DIET in multilevel atomic or molecular systems,” Charron said. “Each emitter will behave as a series of oscillating dipoles, and this is expected to yield a series of transparency windows, thus opening the way for more elaborate and flexible manipulation strategies. We will publish new results on this topic in Arxiv in the next few weeks. Moreover, DIET offers yet another way to slow the light due to strong anomalous dispersion. We thus plan to develop the study of slow light with DIET in the near future, with potential applications for information processing.”center_img (Phys.org) —All objects’ colors are determined by the way that light scatters off of them. By manipulating the light scattering, scientists can control the wavelengths at which light is transmitted and reflected by objects, changing their appearance. Journal information: Physical Review Letters More information: Raiju Puthumpally-Joseph, et al. “Dipole-Induced Electromagnetic Transparency.” Physical Review Letters. DOI: 10.1103/PhysRevLett.113.163603 . Also at arXiv:1407.1970 [quant-ph] Citation: Light-matter interaction can turn opaque materials transparent (2014, October 27) retrieved 18 August 2019 from https://phys.org/news/2014-10-light-matter-interaction-opaque-materials-transparent.html Illustration of a thin, dense vapor of quantum emitters (blue disk) interacting with an incident electromagnetic field. Physicists have shown that strong dipole-dipole interactions in the quantum emitters can be used to manipulate the light scattering and turn opaque objects transparent. Credit: Puthumpally-Joseph, et al. ©2014 American Physical Societylast_img read more

Start reading Lightmatter interaction can turn opaque materials transparent