昭通桑拿

first_imgPandemonium broke out in Linden, Region 10 (Upper Demerara- Berbice) shortly before 09:00h on Tuesday,The Mackenzie-Wismar Bridge from which the woman leapedas a young woman ended her life by jumping off the Mackenzie-Wismar Bridge.According to reports, the woman identified as 24-year-old Tabhita Small of South Amelia’s Ward, Mackenzie, was earlier seen at the Linden Hospital Complex (LHC).A Police source in Linden confirmed that the woman was diagnosed with tuberculosis approximately two years ago and was admitted to the LHC around 15:10h on Monday after experiencing a series of fainting spells.This newspaper understands that she was discharged from the Hospital at approximately 08:30h on Tuesday and went straight to the Bridge.An employee attached to the Bridge told this newspaper that she saw the young woman approaching the western end of the Bridge several times, as she paced back and forth from the eastern to the western end. Upon approaching the western end of the bridge, for the final time, before she made the fatal jump, she was reportedly engaged in an altercation with another young woman whom she reportedly unexpectedly walked up to and began hitting. According to an eyewitness, Small approached a shop located a few yards away from the Bridge and was chased away by the occupants. The woman who operates the shop told this newspaper that Small walked up to her daughter who was preparing to leave the shop for work at the time and landed a “cuff” to her face, to which she retaliated by hitting her. According to the woman, the suicide victim appeared troubled.“She (my daughter) bend to pick up her bag to go to work and she just give she one cuff. She never see the girl, we don’t know the girl, but when I was sitting at the hospital shed, I see this girl pass…She was barefoot and she hair was untidy…When you looked at the girl’s face, she pretty young; I average she to be 20 or lil’ bit over 20. But I never see this girl before…she walked, she go through the train line then she turned back, then she go over the bridge and when she meet in the middle she jump overboard,” the shop owner stated.Following that incident, an eyewitness disclosed that the woman made a failed attempt to jump overboard when the bridge’s barrier was removed, before finally venturing further to the middle where she made the fatal plunge. The eyewitness stated that after the woman went overboard, several persons rushed to the scene in their speedboats; however, they were unsuccessful in rescuing her or retrieving the body.“When I look down, I see she hand go up two times. When I reach down (further down the bridge) the body had already gone down…Everybody saying they never see she,” the eyewitness stated.Up to press time, efforts to retrieve the body proved futile. Police in Linden confirmed that statements were taken from several witnesses and a diving party was dispatched to the location on Tuesday morning and was expected to continue the search for the body on Tuesday afternoon or this morning. Investigations are ongoing.last_img read more

Quantum speed limits are not actually quantum

first_img Both groups—one consisting of Brendan Shanahan and Adolfo del Campo at the University of Massachusetts along with Aurelia Chenu and Norman Margolus at MIT, the other composed of Manaka Okuyama of the Tokyo Institute of Technology and Masayuki Ohzeki at Tohoku University—have published papers on classical speed limits in Physical Review Letters.Over the past several decades, physicists have been investigating quantum speed limits, which determine the minimum time for a given process to occur in terms of the energy fluctuations of the process. A quantum speed limit can then be thought as a time-energy uncertainty relation. Although this concept is similar to Heisenberg’s uncertainty principle, which relates position and momentum uncertainties, time is treated differently in quantum mechanics (as a parameter rather than an observable). Still, the similarities between the two relations, along with the fact that Heisenberg’s uncertainty principle is a strictly quantum phenomenon, have long suggested that quantum speed limits are likewise strictly quantum and have no classical counterpart. The only known limitation on the speed of classical systems is that objects may not travel faster than the speed of light due to special relativity, but this is unrelated to the energy-time relation in quantum speed limits.The new papers show that speed limits based on a trade-off between energy and time do exist for classical systems, and in fact, that there are infinitely many of these classical speed limits. The results demonstrate that quantum speed limits are not based on any underlying quantum phenomena, but instead are a universal property of the description of any physical process, whether quantum or classical.”It is really the notion of information and distinguishability that unifies speed limits in both the classical and quantum domains,” del Campo told Phys.org.As quantum speed limits have potential applications for understanding the ultimate limits of quantum computing, the new results may help to determine which scenarios may benefit from a quantum speedup compared to classical methods. “Quantum speed limits have many applications, ranging from metrology to quantum computation,” del Campo said. “It is exciting to imagine the implications of the classical speed limits we have derived.” More information: B. Shanahan, A. Chenu, N. Margolus, and A. del Campo. “Quantum Speed Limits across the Quantum-to-Classical Transition.” Physical Review Letters. DOI: 10.1103/PhysRevLett.120.070401. Also at arXiv:1710.07335 [quant-ph]Manaka Okuyama and Masayuki Ohzeki. “Quantum Speed Limit is Not Quantum.” Physical Review Letters. DOI: 10.1103/PhysRevLett.120.070402. Also at arXiv:1710.03498 [quant-ph] Journal information: Physical Review Letters Quantum mechanics has fundamental speed limits—upper bounds on the rate at which quantum systems can evolve. However, two groups working independently have published papers showing for the first time that quantum speed limits have a classical counterpart: classical speed limits. The results are surprising, as previous research has suggested that quantum speed limits are purely quantum in nature and vanish for classical systems. Quantum speed limit may put brakes on quantum computers © 2018 Phys.orgcenter_img Citation: Quantum speed limits are not actually quantum (2018, March 15) retrieved 18 August 2019 from https://phys.org/news/2018-03-quantum-limits.html Explore further Source: pixabay 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