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MessagePosté le: Jeu 9 Aoû 2018 - 02:07    Sujet du message: Due to the travel time for radio Répondre en citant

SHANGHAI Air Jordan 6 Low Pas Cher , Sept. 25 (Xinhua) -- Heavy rainstorms battered Shanghai Monday morning, causing flooding in many areas of the city.


Accumulated rainwater exceeded 25 cm on some road sections, with around 200 shops along Xinyuan Road flooded, according to municipal flood control headquarters.


The most serious flooding occurred at a pedestrian crossing on Luoshan Road, where floodwater exceeded 120 cm, the headquarters said in a statement.


More than 10 households were flooded in Zhuqiao Township, Pudong New Area and Chengqiao Township in Chongming District.


Over 500 sanitation workers and 15 vehicles were mobilized to clear floodwater Air Jordan 6 Pas Cher Homme , and traffic disrupted by flooding has now been restored.


Rainstorms hit downtown Shanghai and districts of Chongming, Jiading, Baoshan and Pudong, with over 50 mm of rainfall falling within two hours early Monday.


Precipitation exceeded 145.1 mm in Baoshan District from 8 a.m. Sunday to 8 a.m. Monday, setting a record for September, according to meteorological information.




LOS ANGELES, Sept. 14 (Xinhua) -- On Friday morning Air Jordan 6 Pas Cher , the U.S. National Aeronautics and Space Administration (NASA)'s Cassini spacecraft will dive into Saturn's atmosphere and disintegrate.


"Look up tonight & see Saturn in the sky. Tomorrow, our spacecraft will be part of the planet it studied for so long," Cassini's team said on Twitter Thursday night.


The probe was running low on fuel, and the 13-year tour of the Saturn system mission must end. The spacecraft will make a deliberate plunge into Saturn's atmosphere to avoid the small possibility of it crashing into a potentially habitable moon, in particular Enceladus.


The long-lived spacecraft's fateful dive was the final beat in the mission's Grand Finale, which began in late April, through the gap between Saturn and its rings. No spacecraft has ever ventured so close to the planet before.


On its final orbit Air Jordan 4 Pas Cher Homme , Cassini will plunge into Saturn's atmosphere at tens of thousands of miles per hour, sending back new and unique science to the very end. After losing contact with Earth, the spacecraft will burn up like a meteor, becoming part of the planet itself.


"The spacecraft is transmitting the last data from its recorders," Cassini team tweeted on Thursday afternoon.


The spacecraft is in the process of emptying its onboard solid-state recorder of all science data, including the final images taken by its imaging cameras, prior to reconfiguring for a near-real-time data relay during the final plunge. The communications link with the spacecraft is continuous from now through the end of mission.


Because of Earth's rotation Air Jordan 4 Retro Pas Cher , this 11-hour downlink begins with the NASA Deep Space Network (or DSN) antenna station in California, which then hands off receiving to a station in Canberra, Australia. From this point the spacecraft holds this orientation, its antenna pointed toward Earth, for the remaining several hours of the mission.


According to the mission's final calculations, after beginning its descent into Saturn's upper atmosphere, the spacecraft is expected to lose radio contact with Earth at 4:55 a.m. PDT (1155 GMT) on Friday.


Cassini will enter Saturn's atmosphere at an altitude of about 1 Air Jordan 4 Pas Cher ,915 km above the planet's estimated cloud tops, where the air pressure is 1-bar, equivalent to sea level on Earth. During its dive into the atmosphere, the spacecraft's speed will be approximately 113,000 km per hour.


According to NASA, when the probe first begins to encounter Saturn's atmosphere, Cassini's attitude control thrusters will begin firing in short bursts to work against the thin gas and keep Cassini's saucer-shaped high-gain antenna pointed at Earth to relay the mission's precious final data.


As the atmosphere thickens Air Jordan 13 Retro Pas Cher , the thrusters will be forced to ramp up their activity, going from 10 percent of their capacity to 100 percent in the span of about a minute. Once they are firing at full capacity, the thrusters can do no more to keep Cassini stably pointed, and the spacecraft will begin to tumble.


Cassini is set to make groundbreaking scientific observations of Saturn. Before contact is lost, eight of Cassini's 12 scientific instruments will be operating. All of the mission's magnetosphere and plasma science instruments, plus the spacecraft's radio science system, and its infrared and ultraviolet spectrometers will collect data during the final plunge.


In particular Air Jordan 13 Pas Cher , the spacecraft's Ion and Neutral Mass Spectrometer (INMS) will be directly sampling the atmosphere's composition, which cannot be done from orbit. It will potentially offer insights into the giant planet's formation and evolution.


When the antenna points just a few fractions of a degree away from Earth, communications will be severed permanently. The predicted altitude for loss of signal is about 1,500 kilometers above Saturn's cloud tops. From that point, the spacecraft will begin to burn up like a meteor.


Within about 30 seconds following loss of signal, the spacecraft will begin to come apart; within a couple of minutes, all remnants of the spacecraft are expected to be completely consumed in Saturn's atmosphere.


"The spacecraft's final signal will be like an echo. It will radiate across the solar system for nearly an hour and a half after Cassini itself has gone Air Jordan 12 Retro Pas Cher ," Earl Maize, Cassini project manager at NASA's Jet Propulsion Laboratory, said in a statement.


Due to the travel time for radio signals from Saturn, which changes as both Earth and the ringed planet travel around the Sun, events currently take place there 83 minutes before they are observed on Earth. This means that, although the spacecraft will begin to tumble and go out of communication at 3:31 a.m. PDT (1031 GMT) at Saturn, the signal from that event will not be received at Earth until 83 minutes later.


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