[ti:Japan Aims to Launch World’s First Wooden Satellite]
[by:www.21voa.com]
[00:00.00]更多听力请访问21VOA.COM
[00:00.04]Japanese researchers say they are working to build
[00:04.60]the world's first satellite made of wood.
[00:09.56]The goal is to help fight the problem of space junk.
[00:14.96]Space junk includes things like dead satellites,
[00:19.68]lost pieces of equipment and small pieces of paint.
[00:25.92]Such objects can present threats to spacecraft
[00:30.28]and satellites operating in space.
[00:35.00]The project is a joint effort involving the company
[00:39.56]Sumitomo Forestry and Japan's Kyoto University.
[00:46.60]The development team recently announced plans
[00:50.60]for the satellite in a news release.
[00:54.64]The researchers say the wooden satellite – which they call LignoSat
[01:01.16]– is one of several planned projects that seek to explore
[01:06.16]how wood might be used in space in the future.
[01:12.48]The developers say wood offers several advantages
[01:17.64]over other materials commonly used to build satellites,
[01:22.52]such as aluminum and other metals.
[01:27.52]For example, the researchers say wood
[01:31.56]does not block electromagnetic waves.
[01:35.44]For this reason, wooden structures could be used
[01:40.12]to house antenna equipment
[01:43.00]and other controlling devices, the team said in a statement.
[01:49.40]Wooden structures would also be simpler to design
[01:54.08]and weigh less than current satellite equipment, the researchers added.
[02:01.16]Such satellites would be better for the environment
[02:04.92]because they would burn up when reentering Earth's atmosphere.
[02:10.56]They would not release polluting particles into the air and oceans.
[02:17.28]The researchers say space junk is a growing problem.
[02:23.08]Thousands of non-operating satellites are currently orbiting the Earth,
[02:29.00]and the number of new satellites continues to grow.
[02:34.48]Last year, European and United Nations agencies
[02:39.32]announced they were developing a plan for worldwide action
[02:44.24]to deal with space junk.
[02:47.88]The agencies said waste orbiting the earth
[02:51.84]must be cleaned up to make room for new satellites.
[02:57.48]One of the leaders of the project is Japanese astronaut Takao Doi,
[03:03.64]who is also a professor at Kyoto University.
[03:09.52]He told BBC News that the driving force behind the project
[03:15.64]is the need to limit pollutants released from satellites
[03:20.56]that remain in the upper atmosphere for many years.
[03:26.20]"Eventually it will affect the environment of the Earth," Doi said.
[03:32.36]He added that after the first steps in the research process are completed,
[03:38.84]the team will begin "developing the engineering model of the satellite."
[03:45.88]After that, a satellite flight model will be manufactured.
[03:52.12]The first wooden satellite could be launched by 2023.
[03:58.80]The researchers admit that the project presents
[04:02.92]some big technological problems.
[04:06.88]These include finding a wood material
[04:10.48]that can keep its shape in severe temperatures
[04:14.28]and survive intense sunlight over a long period of time.
[04:20.80]The Japanese project involves researching different wood-based materials
[04:27.32]and protective coatings that can hold up in the extreme conditions of space.
[04:34.68]The team is studying the construction of wooden structures
[04:39.72]using cedar and birch wood.
[04:43.88]The researchers also plan to study
[04:47.24]how other wood products would perform in space.
[04:51.64]They want to find out whether trees could help humans
[04:56.12]in extreme environments such as space stations.
[05:01.44]The company backing the project, Sumitomo Forestry,
[05:06.08]has also developed buildings made mainly of wood.
[05:11.64]In 2018, the company announced its largest project,
[05:16.68]a 350-meter wooden skyscraper to be built in Tokyo.
[05:23.20]It says the goal is to complete the building by 2041.
[05:30.24]I'm Bryan Lynn.
[05:32.28]更多听力请访问21VOA.COM
END OF TRACK. "END OF TRACK." The two men bowed. "Whoever was that person you were talking to?" she enquired, as soon as they stood together. The took of triumph faded from her eyes, she had grown worn and weary. The roses were wilting on the walls, the lights were mostly down now. Hetty, looking in to see if anything was wanted, found herself driven away almost fiercely. I only saw Master Jervie once when he called at tea time, The year 1747 was opened by measures of restriction. The House of Lords, offended at the publication of the proceedings of the trial of Lord Lovat, summoned the parties to their bar, committed them to prison, and refused to liberate them till they had pledged themselves not to repeat the offence, and had paid very heavy fees. The consequence of this was that the transactions of the Peers were almost entirely suppressed for nearly thirty years from this time, and we draw our knowledge of them chiefly from notes taken by Horace Walpole and Lord Chancellor Hardwicke. What is still more remarkable, the reports of the House of Commons, being taken by stealth, and on the merest sufferance, are of the most meagre kind, sometimes altogether wanting, and the speeches are given uniformly under fictitious names; for to have attributed to Pitt or Pelham their[112] speeches by name would have brought down on the printers the summary vengeance of the House. Many of the members complained bitterly of this breach of the privileges of Parliament, and of "being put into print by low fellows"; but Pelham had the sense to tolerate them, saying, "Let them alone; they make better speeches for us than we can make for ourselves." Altogether, the House of Commons exhibited the most deplorable aspect that can be conceived. The Ministry had pursued Walpole's system of buying up opponents by place, or pension, or secret service money, till there was no life left in the House. Ministers passed their measures without troubling themselves to say much in their behalf; and the opposition dwindled to Sir John Hinde Cotton, now dismissed from office, and a feeble remnant of Jacobites raised but miserable resistance. In vain the Prince of Wales and the secret instigations of Bolingbroke and Doddington stimulated the spirit of discontent; both Houses had degenerated into most silent and insignificant arenas of very commonplace business. "It certainly will be. Miss Widgeon," answered Maria, with strictly "company manners." "One who has never had a brother exposed to the constant dangers of army life can hardly understand how glad we all feel to have Si snatched from the very jaws of death and brung back to us." "Just plug at 'em as you would at a crow, and then go on your way whistlin'?" persisted Harry. "Hurroo!" echoed Hennessey; "that's the ticket." "Come forward, keeper," continued the baron, "and state how these arrows came into your hands!" "Yes." HoMEJULIA京香2018下载
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