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Q1229882
Meio Ambiente
Segundo a Organização Pan-Americana de Saúde, representam principais problemas encontrados no setor de abastecimento de água nas Américas, exceto:
Q1223641
Geografia
Germany Dims Nuclear Plants, but Hopes to Keep Lights On Elisabeth Rosenthal Published: August 29, 2011
Biblis, Germany — Not since the grim period after World War II has Germany had significant blackouts, but it is now bracing for that possibility after shutting down half its nuclear reactors practically overnight.
Nuclear plants have long generated nearly a quarter of Germany’s electricity. But after the tsunami and earthquake that sent radiation spewing from Fukushima, half a world away, the government disconnected the 8 oldest of Germany’s 17 reactors — including the two in this drab factory town — within days. Three months later, with a new plan to power the country without nuclear energy and a growing reliance on renewable energy, Parliament voted to close them permanently. There are plans to retire the remaining nine reactors by 2022.
As a result, electricity producers are scrambling to ensure an adequate supply. Customers and companies are nervous about whether their lights and assembly lines will stay up and running this winter. Economists and politicians argue over how much prices will rise.
“It’s easy to say, ‘Let’s just go for renewables’, and I’m quite sure we can someday do without nuclear, but this is too abrupt”, said Joachim Knebel, chief scientist at Germany’s prestigious Karlsruhe Institute of Technology. He characterized the government’s shutdown decision as “emotional” and pointed out that on most days, Germany has survived this experiment only by importing electricity from neighboring France and the Czech Republic, which generate much of their power with nuclear reactors.
Then there are real concerns that the plan will jettison efforts to rein in manmade global warming, since whatever nuclear energy’s shortcomings, it is low in emissions. If Germany, the world’s fourth-largest economy, falls back on dirty coal-burning plants or uncertain supplies of natural gas from Russia, isn’t it trading a potential risk for a real one?
The world is watching Germany’s extreme energy makeover, as politicians from New York to Rome have floated their own plans to shut or shelve reactors.
The International Energy Agency, generally a fan of Germany’s green-leaning energy policy, has been critical. Laszlo Varro, head of the agency’s gas, coal and power markets division, called the plan “very, very ambitious, though it is not impossible, since Germany is rich and technically sophisticated”.
Even if Germany succeeds in producing the electricity it needs, “the nuclear moratorium is very bad news in terms of climate policy”, Mr. Varro said. “We are not far from losing that battle, and losing nuclear makes that unnecessarily difficult”.
The government counters that it is prepared to make huge investments in improving energy efficiency in homes and factories as well as in new clean power sources and transmission lines. So far, there have been no blackouts.
But Jürgen Grossmann, chief executive of the German energy giant RWE, which owns two closed reactors here in Biblis, about 40 miles south of Frankfurt, expressed skepticism. “Germany, in a very rash decision, decided to experiment on ourselves”, he said. “The politics are overruling the technical arguments”.
(Disponível em: http://www.nytimes.com/2011/08/30/science/earth/30germany.html?_r=1&ref=science. Acesso em: 30/08/2011)
Com base no texto, identifique as afirmativas a seguir como verdadeiras (V) ou falsas (F):
( ) A decisão da Alemanha de fechar reatores de usinas nucleares recebeu apoio da população, mas não das empresas.
( ) Os reatores fechados em Biblis pertenciam a uma grande empresa alemã.
( ) Na opinião de Jürgen Grossmann, a decisão da Alemanha de fechar reatores de usinas elétricas priorizou fatores técnicos.
( ) Após o desligamento de 8 reatores, a Alemanha já sofreu alguns blackouts.
Assinale a alternativa que apresenta a sequência correta, de cima para baixo.
Biblis, Germany — Not since the grim period after World War II has Germany had significant blackouts, but it is now bracing for that possibility after shutting down half its nuclear reactors practically overnight.
Nuclear plants have long generated nearly a quarter of Germany’s electricity. But after the tsunami and earthquake that sent radiation spewing from Fukushima, half a world away, the government disconnected the 8 oldest of Germany’s 17 reactors — including the two in this drab factory town — within days. Three months later, with a new plan to power the country without nuclear energy and a growing reliance on renewable energy, Parliament voted to close them permanently. There are plans to retire the remaining nine reactors by 2022.
As a result, electricity producers are scrambling to ensure an adequate supply. Customers and companies are nervous about whether their lights and assembly lines will stay up and running this winter. Economists and politicians argue over how much prices will rise.
“It’s easy to say, ‘Let’s just go for renewables’, and I’m quite sure we can someday do without nuclear, but this is too abrupt”, said Joachim Knebel, chief scientist at Germany’s prestigious Karlsruhe Institute of Technology. He characterized the government’s shutdown decision as “emotional” and pointed out that on most days, Germany has survived this experiment only by importing electricity from neighboring France and the Czech Republic, which generate much of their power with nuclear reactors.
Then there are real concerns that the plan will jettison efforts to rein in manmade global warming, since whatever nuclear energy’s shortcomings, it is low in emissions. If Germany, the world’s fourth-largest economy, falls back on dirty coal-burning plants or uncertain supplies of natural gas from Russia, isn’t it trading a potential risk for a real one?
The world is watching Germany’s extreme energy makeover, as politicians from New York to Rome have floated their own plans to shut or shelve reactors.
The International Energy Agency, generally a fan of Germany’s green-leaning energy policy, has been critical. Laszlo Varro, head of the agency’s gas, coal and power markets division, called the plan “very, very ambitious, though it is not impossible, since Germany is rich and technically sophisticated”.
Even if Germany succeeds in producing the electricity it needs, “the nuclear moratorium is very bad news in terms of climate policy”, Mr. Varro said. “We are not far from losing that battle, and losing nuclear makes that unnecessarily difficult”.
The government counters that it is prepared to make huge investments in improving energy efficiency in homes and factories as well as in new clean power sources and transmission lines. So far, there have been no blackouts.
But Jürgen Grossmann, chief executive of the German energy giant RWE, which owns two closed reactors here in Biblis, about 40 miles south of Frankfurt, expressed skepticism. “Germany, in a very rash decision, decided to experiment on ourselves”, he said. “The politics are overruling the technical arguments”.
(Disponível em: http://www.nytimes.com/2011/08/30/science/earth/30germany.html?_r=1&ref=science. Acesso em: 30/08/2011)
Com base no texto, identifique as afirmativas a seguir como verdadeiras (V) ou falsas (F):
( ) A decisão da Alemanha de fechar reatores de usinas nucleares recebeu apoio da população, mas não das empresas.
( ) Os reatores fechados em Biblis pertenciam a uma grande empresa alemã.
( ) Na opinião de Jürgen Grossmann, a decisão da Alemanha de fechar reatores de usinas elétricas priorizou fatores técnicos.
( ) Após o desligamento de 8 reatores, a Alemanha já sofreu alguns blackouts.
Assinale a alternativa que apresenta a sequência correta, de cima para baixo.
Q1222580
Arquitetura de Computadores
Dentre os componentes funcionais dos computadores, temos a Placa de Rede. Analise os itens e assinale a alternativa correta:
I- Cada placa dispõe de um endereço único, chamado MAC, atribuído pelo construtor da placa, que lhe permite ser identificada entre todas as outras placas de rede.
II- Para aumentar as distâncias máximas, existem outros padrões Ethernet que, na maioria das vezes, usam a fibra opaca como suporte de comunicação.
III- A maioria das placas são Ethernet, elas usam, como meio de comunicação, pares trançados (8 fios de cobre) em ambas as extremidades de conectores RJ45.
IV- 1000Base-T permite uma taxa máxima de transferência de 1.000 Mbit/s, também chamada de Gigabit Ethernet.
I- Cada placa dispõe de um endereço único, chamado MAC, atribuído pelo construtor da placa, que lhe permite ser identificada entre todas as outras placas de rede.
II- Para aumentar as distâncias máximas, existem outros padrões Ethernet que, na maioria das vezes, usam a fibra opaca como suporte de comunicação.
III- A maioria das placas são Ethernet, elas usam, como meio de comunicação, pares trançados (8 fios de cobre) em ambas as extremidades de conectores RJ45.
IV- 1000Base-T permite uma taxa máxima de transferência de 1.000 Mbit/s, também chamada de Gigabit Ethernet.
Q1222197
Segurança da Informação
Considere o contexto no qual não existe falha de segurança na proteção da(s) chave(s) privada(s) e pública(s). Dentro deste contexto, se Marcelo escreve um e-mail para José e o assina digitalmente, José pode ter certeza de que
Q1220570
Sociologia
Considere as seguintes afirmativas: 1. A imagem de adolescência no Ocidente foi estabelecida no final do século 18 e resistiu às mudanças de comportamentos observadas nas últimas décadas do século 20. 2. Dois fatores foram decisivos para a atual condição da juventude: a desmontagem da família burguesa e as consequências do neoliberalismo e da globalização no mercado de trabalho. 3. Ser jovem é uma característica altamente valorizada pela sociedade atual. 4. A ocupação preferencial dos postos de trabalho por pessoas idosas e a exigência de qualificação provocam o aumento do desemprego entre os jovens.
Estão de acordo com o texto as afirmativas:
Estão de acordo com o texto as afirmativas:
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