Astronaut Jim Voss has enjoyed many memorable moments in his career, including three space flights and one space walk. But he recalls with special fondness a decidedly earthbound experience in the summer of 1980, when he participated in the NASA-AS-EE Summer Faculty Fellowship Program. Voss, then a science teacher at West Point, was assigned to the Marshall Space Flight Center’s propulsion lab in Alabama to analyze why a hydraulic fuel pump seal on the space shuttle was working so well when previous seals had failed. It was a seemingly tiny problem among the vast complexities of running the space program. Yet it was important to NASA because any crack in the seals could have led to destructive results for the astronauts who relied on them.
"I worked a bit with NASA engineers," says Voss, "but I did it mostly by analysis. I used a handheld calculator, not a computer, to do a thermodynamic analysis. "At the end of the summer, he, like the other NASA-ASEE fellows working at Marshall, summarized his findings in a formal presentation and detailed paper. It was a valuable moment for Voss because the ASEE program gave him added understanding of NASA, deepened his desire to fly in space, and intensified his application for astronaut status.
It was not an easy process. Voss was actually passed over when he first applied for the astronaut program in 1978. Over the next nine years he reapplied repeatedly, and was finally accepted in 1987. Since then he has participated in three space missions. The 50-year-old Army officer, who lives in Houston, is now in training for a four-month mission as a crew member on the International Space Station starting in July 2000.
Voss says the ASEE program is wonderful for all involved. "It brings in people from the academic world and gives NASA a special property for a particular period of time. It brings some fresh eyes and fresh ideas to NASA, and establishes link with our colleges and universities," Voss explains. "There’s an exchange of information and an exchange of perspectives that is very important."
For the academic side, Voss says, the ASEE program also "brings institutions of higher learning more insight into new technology. We give them an opportunity to work on real-world problems and take it back to the classroom. /
Why was the hydraulic fuel pump seal important for the space shuttle
A:Because previous seals all failed. B:Because it was very complex in running the space program. C:Because great care has to be taken of the hydraulic fuel pump sealing. D:Because any crack in the seals would cause disastrous results for the astronauts.
Astronaut Jim Voss has enjoyed many memorable moments in his career, including three space flights and one space walk. But he recalls with special fondness a decidedly earthbound experience in the summer of 1980, when he participated in the NASA-AS-EE Summer Faculty Fellowship Program. Voss, then a science teacher at West Point, was assigned to the Marshall Space Flight Center’s propulsion lab in Alabama to analyze why a hydraulic fuel pump seal on the space shuttle was working so well when previous seals had failed. It was a seemingly tiny problem among the vast complexities of running the space program. Yet it was important to NASA because any crack in the seals could have led to destructive results for the astronauts who relied on them.
"I worked a bit with NASA engineers," says Voss, "but I did it mostly by analysis. I used a handheld calculator, not a computer, to do a thermodynamic analysis. "At the end of the summer, he, like the other NASA-ASEE fellows working at Marshall, summarized his findings in a formal presentation and detailed paper. It was a valuable moment for Voss because the ASEE program gave him added understanding of NASA, deepened his desire to fly in space, and intensified his application for astronaut status.
It was not an easy process. Voss was actually passed over when he first applied for the astronaut program in 1978. Over the next nine years he reapplied repeatedly, and was finally accepted in 1987. Since then he has participated in three space missions. The 50-year-old Army officer, who lives in Houston, is now in training for a four-month mission as a crew member on the International Space Station starting in July 2000.
Voss says the ASEE program is wonderful for all involved. "It brings in people from the academic world and gives NASA a special property for a particular period of time. It brings some fresh eyes and fresh ideas to NASA, and establishes link with our colleges and universities," Voss explains. "There’s an exchange of information and an exchange of perspectives that is very important."
For the academic side, Voss says, the ASEE program also "brings institutions of higher learning more insight into new technology. We give them an opportunity to work on real-world problems and take it back to the classroom. "
A:Because previous seals all failed. B:Because it was very complex in running the space program. C:Because great care has to be taken of the hydraulic fuel pump sealing. D:Because any crack in the seals would cause disastrous results for the astronauts.
All things (had) been canceled (because) of the snowstorm, many passengers could do (nothing) but (take) the train.
A:had B:because C:nothing D:take
C
Franklin’s life is full of charming (有趣的) stories which all young men should know--how he peddled(叫卖) ballads in Boston, and stood, the guest of kings, in Europe; how he worked his pas sage as a stowaway to Philadelphia, and rode in the queen’s own litter in France; how he walked the streets of Philadelphia, homeless and unknown, with three penny rolls for his breakfast, and dined at the tables of princess, and received his friends in a palace; how he raised a kite from a cow shed, and was showered with all the high degrees the colleges of the world could give, how he was duped by a false friend as a boy, and became the friend of all humanity as a man; how he was made Major Gen eral Franklin, only to resign because; as he said, he was no soldier, and yet helped to organize the army that stood before the trained troops of England and Germany.
This poor Boston boy, with scarcely a day’s schooling, became master of six languages and never stopped studying; this neglected apprentice tamed the lightening, made his name famous, received degrees and diplomas from colleges in both hemispheres, and became forever remembered as "Doctor Franklin" ,philosopher ,patriot ,scientist ,philanthropist(慈善家) and statesman.
Self-made, self-taught, self-reared ,the candle maker’s son gave light to all the world; the street ballad seller set all men singing of liberty; the runaway apprentice became the most sought-after man of two continents, and brought his native land to praise and honour him.
He built America--for what our Republic today is largely due to the prudence, the forethought, the statesmanship, the enterprise, the wisdom, and the ability of Benjamin Franklin. He belongs to the world, but especially does he belong to America. As the nations honoured him while living, so the Re public glorifies him when dead, and has enshrined him in the choicest of its niches--the one he regarded as the loftiest--the hearts of the common people, from whom he had sprung and in their hearts Franklin will live forever.
A:Because he mastered six languages and had been to many countries. B:Because he became the friend of all humanity as a man. C:Because he was a scientist, he tamed lightning he invented lightning rod (避雷针), and gave light to all the world. D:Because he was showered with all the high degrees the colleges of the world could give.
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? ? ? ? ? Jean Sibelius and His Music{{/B}} ? ?Jean Sibelius felt very much alone because he couldn’t accept the music of that day. He believed that one should be able to make for oneself an ideal by reflection, and thought that modern music did not progress because it marked time without moving a step farther. ? ?When he began work on his Fifth Symphony, Europe and his beloved Finland were being ravaged by World War I. He wrote in September of 1914. "But I already begin to see dimly the mountain that I shall certainly ascend—God opens His door for a moment and His orchestra plays the Fifth Symphony." But from the very first he was full of doubts about this work. He wasn’t sure whether or not he should have begun on the Fifth Symphony. He suffered a good deal for having persevered in composing symphonies at a time when practically all composers had turned to other forms of expression. ? ?The Fifth Symphony was completed late in 1915. It was performed on the composer’s fiftieth birthday which was declared a national holiday. Sibelius conducted the concert but he was not satisfied with this new work. In October of 1916, he revised the symphony but a performance two months later still did not satisfy him. |
A:Because he realized his limitations as a music composer. B:Because he couldn’t accept the music of that day. C:Because he lived far from his family. D:Because all of his friend excluded him from music.
A:Because the Internet is an efficient way of spreading news. B:Because the services on the Internet are good. C:Because the news is very important in the Australian history. D:Because the news relates to people all over the world.
Almost one half of all Americans have to pay experts,because_______.
A:the list of taxes seems endless B:they would rather spend their time and energy elsewhere C:they find their knowledge about taxes is so limited that they are unable to write tax report all by themselves D:paying experts to prepare their tax report and asking for tax advice have become very popular
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