Questões de Concurso Sobre interpretação de texto | reading comprehension em inglês

(abridged from Next Frontiers in Newsweek, April 3, 2006) 

NASA’s Nuclear Frontier: The Plum Brook Reactor Facility

    There are three main types of nuclear reactors: power, research, and test. Research and test reactors as scientific tools are more common than most people realize. While power reactors frequently appear in newspaper headlines and are conspicuous because of their size and power, research reactors can be quietly tucked away, even in the midst of a college campus. Power reactors generate heat, which can easily be converted to other useable forms of energy, such as electricity. Research reactors operate at very low thermal power levels – so low, in fact, that they do not even require any type of forced cooling. They are used to measure nuclear parameters and other characteristics, which can then be used to build other reactors or to design experiments for test reactors. Test reactors are more powerful than research reactors and are able to produce much more intense radiation fields. Though they are still much less powerful than the power reactors, they generate enough heat to require a closed-loop forced-circulation coolant system. This system will remove the heat from the reactor by transferring it to a secondary cooling system, which releases it into the atmosphere through cooling towers.

NASA’s Nuclear Frontier: The Plum Brook Reactor Facility. Pages 36 to 40. 

Chile Violence Continues Despite Government's Retreat on Fare Hike

By Eva Vergara

(SANTIAGO, Chile) — Protests and violence in Chile spilled over into a new day and raged into Sunday night despite the president cancelling a subway fare hike that has prompted violent demonstrations.

Officials in the Santiago region said three people died in fires at two looted supermarkets early Sunday — among 60 Walmart-owned outlets that have been vandalized, and the company said many stores did not open during the day. Five more people later were found dead in the basement of a burned warehouse and were not employees, authorities said.

At least two airlines cancelled or rescheduled flights into the capital, affecting more than 1,400 passengers Sunday and Monday.

President Sebastián Piñera, facing the worst crisis of his second term as head of the South American country, announced Saturday night that he was cancelling a subway fare hike imposed two weeks ago. The fare boost touched off major protests that included rioting that caused millions of dollars in damage to burned buses and vandalized subway stops, office buildings and stores.

After meeting with the heads of the legislature and judicial system Sunday, Piñera said they discussed solutions to the current crisis and that he aims “to reduce excessive inequalities, inequities abuses, that persist in our society.”

Jaime Quintana, president of the Senate, said that “the political world must take responsibility for how we have come to this situation.”

Authorities said 10,500 soldiers and police officers were patrolling the streets in Santiago as state of emergency and curfew remained in effect for six Chilean cities, but protests continued during the day. Security forces used tear gas and jets of water to try disperse crowds.

Interior Minister Andrés Chadwick reported that 62 police officers and 11 civilians were injured in the latest disturbances and prosecutors said nearly 1,500 people had been arrested. He said late Sunday that there had been more than 70 “serious events” during the day, including more than 40 incidents of looting.

With transportation frozen, Cynthia Cordero said she had walked 20 blocks to reach a pharmacy to buy diapers, only to find it had been burned.

“They don’t have the right to do this,” she said, adding it was right to protest “against the abuses, the increases in fares, against bad education and an undignified pension, but not to destroy.”

Long lines formed at gas stations as people tried to fill up for a coming workweek with a public transport system disrupted by the destructive protests. Santiago’s subway, which carries an average of 2.4 million riders on a weekday, had been shut down since Friday.

Subway system chief Louis De Grange said workers would try to have at least one line running Monday, but he said it could take weeks or months to have the four others back in service. He said 85 stations and more than three-fourths of the system had been severely damaged.