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#1 11-05-2018 10:28:24

chitianshi520
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Date d'inscription: 06-01-2018
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The 6.9 percent economic expansion rate is an impressive

SAN FRANCISCO Adidas Originals NMD XR1 Grey/White UK , July 19 (Xinhua) -- Inspired by natural organisms that cover distance by growing, such as vines, fungi and nerve cells, mechanical engineers at Stanford University have created a new type of robot as a proof of concept.


The robot, which has been through some challenging tests nike cortez ultra breathe black , can grow across long distances without moving its whole body.


"Essentially, we're trying to understand the fundamentals of this new approach to getting mobility or movement out of a mechanism," explained Allison Okamura, professor of mechanical engineering and senior author of a paper published Wednesday in journal Science Robotics. "It's very, very different from the way that animals or people get around the world."


The basic idea behind this robot is straightforward. It's a tube of soft material folded inside itself nike cortez ultra moire khaki , like an inside-out sock, that grows in one direction when the material at the front of the tube everts, as the tube becomes right-side-out.


To investigate what their robot can do, the group created prototypes that move through various obstacles, travel toward a designated goal nike classic cortez white , and grow into a free-standing structure. And in the prototypes, the material was a thin, cheap plastic and the robot body everted when the researchers pumped pressurized air into the stationary end.


In testings, the research group tried to move the robot from one place to another in several ways. It grew through an obstacle course, where it traveled over flypaper nike cortez uk , sticky glue and nails and up an ice wall to deliver a sensor. It completed the course even though it was punctured by the nails because the area that was punctured didn't continue to move and, as a result, self-sealed by staying on top of the nail.


A primary advantage of soft robots is that they can be safer than hard, rigid robots not only because they are soft but also because they are often lightweight. Another benefit, in the case of this robot nike air max 95 ultra jacquard khaki , is that it is flexible and can follow complicated paths.


"The body lengthens as the material extends from the end but the rest of the body doesn't move," noted Elliot Hawkes, a visiting assistant professor from the University of California, Santa Barbara, and lead author of the paper. "The body can be stuck to the environment or jammed between rocks nike air max 95 sale , but that doesn't stop the robot because the tip can continue to progress as new material is added to the end."


Some iterations of these robots included a control system that differentially inflated the body, which made the robot turn right or left. The researchers developed a software system that based direction decisions on images coming in from a camera at the tip of the robot.


Joey Greer, a graduate student in the Okamura lab and co-author of the paper, was quoted as saying in a news release that controlling a robot requires a precise model of its motion, which is difficult to establish for a soft robot. "Also nmd cs1 trail black , using a camera to guide the robot to a target is a difficult problem because the camera imagery needs to be processed at the rate it is produced. A lot of work went into designing algorithms that both ran fast and produced results that were accurate enough for controlling the soft robot."


In the future, the researchers would like to create versions that may also grow using liquid, which could help deliver water to people trapped in tight spaces or to put out fires in closed rooms, and possibly with new, tougher materials nmd cs2 primeknit black , like rip-stop nylon and Kevlar. In addition, they hope to scale the robot much larger and much smaller to see how it performs.




LISBON, Oct. 25 (Xinhua) -- Portugal's budget plan for 2017 underscored the government's commitment to fiscal consolidation, but does not fully address the fiscal risks posed by weak growth and legal problems in the financial system, rating agency Fitch said in a statement on Tuesday.


"The plan accords with our view that the Portuguese authorities will continue to narrow the budget deficit, despite the anti-austerity rhetoric of the government and some high-profile policy measures such as increasing public-sector pay and a hike in pensions," Fitch said.


"Overall, the plan extends the minority Socialist Party government's track record of prudent fiscal policy-making. The risk of political clashes between the Socialists and the more radical Communist Party and Left Bloc appears to have receded significantly, assuring more policy stability."


However the biggest risk to fiscal consolidation is "subdued growth", Fitch said.


"The 2017 budget plan balances deficit reduction with measures to stimulate growth, including some tax cuts and new social benefits. But while this may support private consumption, it does little to incentivise investment, which is struggling," Fitch warns, adding "prospects for the banking sector remain weak."


The 2017 budget plan gives no details as to the government's solution to cleaning up bank balance sheets that would be attractive to private investors, Fitch said.


Fitch maintains a more cautious outlook than the government and expects the deficit to end at 2.7 percent of GDP this year.


The agency concludes that Portugal's BB+ Stable sovereign rating is constrained by high debt and weak growth.


Prime Minister Antonio Costa's government came into office in November, after being backed by the Left Bloc and Communist party in parliament.


Portugal's draft plan submitted to the European Commission last week targets a general government budget deficit of 1.6 percent of GDP in 2017, down from a forecast 2.4 percent in 2016.


The budget plan projects general government debt to be 128.3 percent of GDP at the end of 2017.


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