Post a comment Tags SpaceX’s Crew Dragon NASA/SpaceX SpaceX continues to progress in its efforts to bring back human flight travel, releasing a new video this week highlighting its Crew Dragon parachute tests. The roughly two-and-a-half-minute video, which features the parachutes deploying in a variety of conditions and altitudes, closes with the tag “SpaceX is returning human spaceflight capabilities with one of the safest, most advanced systems ever built.” The video highlighting its landing capabilities comes after a SpaceX Crew Dragon capsule unexpectedly exploded during a ground test at Cape Canaveral in Florida on April 20 due to a leak in the spacecraft’s pressurization system. Similar to Boeing’s Starliner, the Crew Dragon is part of NASA’s Commercial Crew program that aims to return to using US-built craft to deliver astronauts to space. Recent missions have outsourced transport to Russian spacecraft since the end of the space shuttle program in 2011. It’s not yet known when SpaceX will launch the next Crew Dragon flight, named Demo-2, but you can watch the parachute tests below. 0 Sci-Tech CNET’s Eric Mack contributed to this story. Share your voice SpaceX
Undertaker and Goldberg had a forgettable matchIf The Undertaker and Goldberg had a match 15 years ago, it would have been the most keenly anticipated contest in the wrestling world. But now, with both wrestlers on the wrong side of 50 and out of action for a long time, their first-ever contest in WWE turned out to be a fest of botches and barely-executed manoeuvres.This painful display of these two legends trying to extract the very last few drops of wrestling left in them left the fans watching around the world feel a great deal of anguish. Many vented their disappointment on social media while some outrightly ridiculed the contest.Highlights from The Undertaker vs Goldberg #WWESSD #WWE pic.twitter.com/P8rvs58IXK— Mordis Gooner ? (@maldivesgooner) June 7, 2019Twitter Twitter Twitter Twitter TwitterOne term that came to be used very commonly on Twitter was ‘worst match.’ For some, it was the worst match of the year while some thought it was the worst match the two had competed in during the course of their entire career.To be fair to the two performers, they did try their best. Goldberg, whose previous run with the company produced only very short matches, did much more in this contest and used moves other than the ‘Spear’ and ‘Jackhammer.’ Undertaker too, tried his absolute best in living up to the expectations. But the fact that they are beyond the age where they can produce great matches was clearly visible. Pulling off their signature moves seemed much too hard for them. Goldberg even came dangerously close to suffering a serious neck injury when Undertaker performed his finisher, Tombstone Piledriver. The fact that the contest ended with a chokeslam from the Deadman where he could barely raise his opponent was rather apt.Hopefully, WWE and its boss Vince McMahon would have enough respect and concern for these two legends to not put them through another such contest. If they still compete, it should be against a younger wrestler who can work a good match against these legends. But the best option would be to let these wrestlers remain in retirement and let their aura remain undiminished.
Listen 00:00 /03:45 Gail DelaughterA truck passes over a bridge built by Harris County on Runneburg Road in Crosby.Harris County Rides helps provide on-demand transportation for the elderly and disabled. Int provided about 75,000 trips in 2015. News 88.7 Transportation Reporter Gail Delaughter talked about the service with Vernon Chambers, the Assistant Director of Harris County’s Office of Transit Services.Delaughter: How do clients use the services of Harris County Rides?Vernon Chambers: The client can use the service for wherever they need to go or whatever they need to do. However, we find that a lot of the trips, clients really use it for medical appointments. And many of them use it for various functions just to remain independent in the community.Delaughter: How crucial is it to have a way to get to those appointments?Vernon Chambers: It’s very critical because a lot of those clients are dialysis clients, which are routine trips three days a week. And that’s a lifeline for them.Delaughter: There are places in Harris County that are essentially rural. If you live out there and have no transportation, what is it like?Vernon Chambers: Well, you’re dependent on services like Harris County Rides. It’s demand-response. We pick the client up from their home and take them where they want to go.It’s not about having a car. Many of them are at the age where they can no longer drive. And so they need services like Harris County Rides that can take them where they need to go to remain independent in the community. Delaughter: What are some of the things you hear from people who had no means of transportation but who can now get around?Vernon Chambers: A lot of clients, sometime they can rely on friends or relatives. But after a while they get tired of asking friends or relatives to take them where they need to go. And so with Harris Rides they feel that gives them independence to go where they need to go without having to depend on someone else. Delaughter: How much do you see the demand growing here in Harris County?Vernon Chambers: It’s really going to grow a whole lot because of the aging population. A lot of people have moved out to the outskirts of the city and the suburbs where there is no transportation. So they’ve aged in place. They can’t drive for various reasons. Delaughter: The way you provide the service, you’re basically subsidizing cab rides?Vernon Chambers: The rides program basically subsidizes at 50-percent. So if a trip for example is $20, the client will pay $10 and we will pay $10.Delaughter: Where do you think things are going to go in the future with the kind of transportation you provide?Vernon Chambers: We get calls from clients asking us, are you going to be looking at Uber or things like that. There are a lot factors that go into whether or not we could contract with someone like Uber. But I am not ruling that out. At this time, we are concerned about the client’s safety. And they would have to meet Harris County’s criteria to become a provider, such as insurance, background checks, and all that kind of thing. To embed this piece of audio in your site, please use this code: Share X
(PhysOrg.com) — “The concept of matter waves is at the heart of quantum mechanics,” Oliver Morsch tells PhysOrg.com. “At the beginning of the last century, scientists discovered that solid particles could exhibit properties of waves, such as interference and diffraction. Until then, it was assumed that only light behaved as a wave. But in the quantum world everything is basically a wave.” Citation: Exerting better control over matter waves (2009, March 27) retrieved 18 August 2019 from https://phys.org/news/2009-03-exerting.html Distinguishing decoherence in quantum systems Morsch is part of a group of scientists, including Alessandro Zenesini, Hans Lignier, Donatella Ciampini and Ennio Arimondo, at the University of Pisa in Italy. The group has discovered a way to more efficiently control matter waves in a setup that simulates a solid state system. “Once you have control over a quantum system,” Morsch explains, “you can learn any number of things, especially from a fundamental point of view. Additionally, it is worth noting that almost all of our modern technology is related in some way to quantum mechanical principles.” The group’s technique is described in Physical Review Letters: “Coherent Control of Dressed Matter Waves.”In order to control the matter waves, Morsch and his colleagues created an optical lattice. “We, in effect, create a light crystal,” Morsch says. “It’s not a true solid, but it mimics the crystal lattice of a solid. It provides us with a sort of model system for solid state applications, allowing us to perform experiments without being bound by the naturally given physical properties of a solid.” Once the lattice is created, using lasers and mirrors, the Pisa University group shook the mirrors – and hence the optical lattice – to create a phenomenon known as dynamic localization.“It’s very counter-intuitive,” Morsch says of dynamic localization. “Before we shake the lattice, atoms move freely throughout by quantum tunneling. However, once we apply the shaking, they stop moving. For certain values, we can make sure that atoms stay put in one lattice site. We can also create a quantum phase transition so that the system changes its bulk properties when you change a parameter. In our experiment, we create a phase transition by shaking. That is our control over the matter waves.”Instead of being a top to bottom approach, the Pisa group is interested in starting at the bottom – with individual particles. “Rather than trying to tweak the bulk system,” Morsch explains, “we are trying to tweak the properties of the individual particles to meet our needs. We are controlling the matter wave to shape it to our needs, and then using that to control the larger system.”Morsch points out that, right now, this process is most interesting from a fundamental point of view. However, he believes that it is likely to develop into greater uses in the future. Morsch thinks that this method has potential applications in quantum control schemes, which could be important in the development of quantum computers and in directed chemical reactions. “If you look at the history of physics and quantum mechanics, you find that each time you develop another handle on the quantum world – somehow learn how to better control the properties of a quantum system – new inventions and technology come about. This method of control is so new that it is impossible to really predict what, if anything, might come out of it.”“For the most part,” Morsch continues, “this work represents yet another method that will give us more control over the quantum state of single particles. Over the last 15 or 20 years, it has become possible, and increasingly important, to exert control at the single-particle level. Our demonstration is in line with what existing theory shows, and could be another tool for the development of future quantum-based technologies.”More information: Alessandro Zenesini, Hans Lignier, Donatella Ciampini, Oliver Morsch, and Ennio Arimondo, “Coherent Control of Dressed Matter Waves.” Physical Review Letters (2009). Available online: link.aps.org/doi/10.1103/PhysRevLett.102.100403 .Copyright 2009 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. Explore further 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.