Considere o seguinte modelo VAR(1) estacionário:

!$ X_{1,t} = 0,5 + 0,6X_{1,t -1} + 0,1X_{2,t -1} + \varepsilon_{1,t} !$

!$ X_{2,t} = 1 + 0,1X_{1,t -1} + 0,6X_{2,t-1} + \varepsilon_{2,t} !$

onde !$ E(\varepsilon_{1,t}) = E(\varepsilon_{2,t}) = 0 !$

O vetor de médias de !$ (X_{1,t} ; X_{2,t}) !$ é dado por

Considerando-se o novo marco regulatório do setor de gás, estabelecido através da Lei nº 11.909, de 04/03/2009, foram regulamentadas algumas definições relacionadas às atividades do setor de gás natural.

Associe as definições dos gasodutos às suas respectivas descrições.

As associações corretas são

O quadro abaixo apresenta as projeções dos consumos de diversas fontes de energia para os anos de 2011, 2015 e 2020.

Consumo final (10³ tep) e participação por fonte na matriz energética (%)

Fonte: EPE

Após a análise desse quadro, conclui-se que a(s)

O modelo de regressão linear Y = β₀ + β₁X₁ + ε foi aplicado a um conjunto de dados, sendo ε o ruído branco.

Considere a tabela ANOVA, incompleta, resultante a seguir.

Se uma nova variável X₂ for incorporada ao modelo, o coeficiente de determinação, R², será

A investigação do número diário de navios que partem de um porto concluiu que a série segue o processo AR(1)

!$ X_t = \mu + \phi X_{t−1} + \cdots + \varepsilon_t !$

onde !$ \varepsilon_t !$ é ruído branco.

A função de autocorrelação amostral dos dados analisados apresenta os seguintes valores:

Com base nas informações acima, a estimativa do parâmetro !$ \phi !$ obtida pelo método dos momentos é

Has Higgs been really discovered?

by Scientific American

Top physicists have recently reached a frenzy over the announcement that the Large Hadron Collider in Geneva is planning to release what is widely expected to be tantalizing - although no conclusive - evidence for the existence of the Higgs boson, the elementary particle hypothesized to be the origin of the mass of all matter.

Many physicists have already swung into action, swapping rumors about the contents of the announcement and proposing grand ideas about what those rumors would mean, if true. “It’s impossible to be excited enough,” says Gordon Kane, a theoretical physicist at the University of Michigan at Ann Arbor.

The spokespeople of the collaborations using the cathedral-size ATLAS and CMS detectors^(a) to search for the Higgs boson and other phenomena^(b) at the 27-kilometer-circumference proton accelerator of the Large Hadron Collider (LHC) are scheduled to present updates based on analyses of the data collected to date^(c). “There won’t be a discovery announcement, but it does promise to be interesting^(d), since there are rumors that scientists have seen hints of the elusive Higgs boson^(e)” says James Gillies, spokesperson for CERN (European Organization for Nuclear Research), which hosts the LHC.

Joe Lykken, a theoretical physicist at Fermi National Accelerator Laboratory in Batavia, Ill, and a member of the CMS collaboration, says: “Whatever happens eventually with the Higgs, I think we’ll look back on this meeting and say. ‘This was the beginning of something.’” (As a CMS member, Lykken says he is not yet sure himself what results ATLAS would unveil; he is bound by his collaboration’s rules not to reveal what CMS has in hand.)

Available at: <http://news.cnet.com/8301-11386_3-57341543-76/has-higgs-been-discovered-rumors--of-watershed-news-build/?tag=mncol;topStories>. Retrieved on: 11 Dec. 2011. Adapted.

Has Higgs been really discovered?

by Scientific American

Top physicists have recently reached a frenzy over the announcement that the Large Hadron Collider in Geneva is planning to release what is widely expected to be tantalizing - although no conclusive - evidence for the existence of the Higgs boson, the elementary particle hypothesized to be the origin of the mass of all matter.

Many physicists have already swung into action, swapping rumors about the contents of the announcement and proposing grand ideas about what those rumors would mean, if true. “It’s impossible to be excited enough,” says Gordon Kane, a theoretical physicist at the University of Michigan at Ann Arbor.

The spokespeople of the collaborations using the cathedral-size ATLAS and CMS detectors^(a) to search for the Higgs boson and other phenomena^(b) at the 27-kilometer-circumference proton accelerator of the Large Hadron Collider (LHC) are scheduled to present updates based on analyses of the data collected to date^(c). “There won’t be a discovery announcement, but it does promise to be interesting^(d), since there are rumors that scientists have seen hints of the elusive Higgs boson^(e)” says James Gillies, spokesperson for CERN (European Organization for Nuclear Research), which hosts the LHC.

Joe Lykken, a theoretical physicist at Fermi National Accelerator Laboratory in Batavia, Ill, and a member of the CMS collaboration, says: “Whatever happens eventually with the Higgs, I think we’ll look back on this meeting and say. ‘This was the beginning of something.’” (As a CMS member, Lykken says he is not yet sure himself what results ATLAS would unveil; he is bound by his collaboration’s rules not to reveal what CMS has in hand.)

Available at: <http://news.cnet.com/8301-11386_3-57341543-76/has-higgs-been-discovered-rumors--of-watershed-news-build/?tag=mncol;topStories>. Retrieved on: 11 Dec. 2011. Adapted.

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Has Higgs been really discovered?

by Scientific American

Top physicists have recently reached a frenzy over the announcement that the Large Hadron Collider in Geneva is planning to release what is widely expected to be tantalizing - although no conclusive - evidence for the existence of the Higgs boson, the elementary particle hypothesized to be the origin of the mass of all matter.

Many physicists have already swung into action, swapping rumors about the contents of the announcement and proposing grand ideas about what those rumors would mean, if true. “It’s impossible to be excited enough,” says Gordon Kane, a theoretical physicist at the University of Michigan at Ann Arbor.

The spokespeople of the collaborations using the cathedral-size ATLAS and CMS detectors to search for the Higgs boson and other phenomena at the 27-kilometer-circumference proton accelerator of the Large Hadron Collider (LHC) are scheduled to present updates based on analyses of the data collected to date. “There won’t be a discovery announcement, but it does promise to be interesting, since there are rumors that scientists have seen hints of the elusive Higgs boson” says James Gillies, spokesperson for CERN (European Organization for Nuclear Research), which hosts the LHC.

Joe Lykken, a theoretical physicist at Fermi National Accelerator Laboratory in Batavia, Ill, and a member of the CMS collaboration, says: “Whatever happens eventually with the Higgs, I think we’ll look back on this meeting and say. ‘This was the beginning of something.’” (As a CMS member, Lykken says he is not yet sure himself what results ATLAS would unveil; he is bound by his collaboration’s rules not to reveal what CMS has in hand.)

Available at: <http://news.cnet.com/8301-11386_3-57341543-76/has-higgs-been-discovered-rumors--of-watershed-news-build/?tag=mncol;topStories>. Retrieved on: 11 Dec. 2011. Adapted.

The excerpt “Many physicists have already swung into action” could be properly completed in

Has Higgs been really discovered?

by Scientific American

Top physicists have recently reached a frenzy over the announcement that the Large Hadron Collider in Geneva is planning to release what is widely expected to be tantalizing - although no conclusive - evidence for the existence of the Higgs boson, the elementary particle hypothesized to be the origin of the mass of all matter.

Many physicists have already swung into action, swapping rumors about the contents of the announcement and proposing grand ideas about what those rumors would mean, if true. “It’s impossible to be excited enough,” says Gordon Kane, a theoretical physicist at the University of Michigan at Ann Arbor.

The spokespeople of the collaborations using the cathedral-size ATLAS and CMS detectors to search for the Higgs boson and other phenomena at the 27-kilometer-circumference proton accelerator of the Large Hadron Collider (LHC) are scheduled to present updates based on analyses of the data collected to date. “There won’t be a discovery announcement, but it does promise to be interesting, since there are rumors that scientists have seen hints of the elusive Higgs boson” says James Gillies, spokesperson for CERN (European Organization for Nuclear Research), which hosts the LHC.

Joe Lykken, a theoretical physicist at Fermi National Accelerator Laboratory in Batavia, Ill, and a member of the CMS collaboration, says: “Whatever happens eventually with the Higgs, I think we’ll look back on this meeting and say. ‘This was the beginning of something.’” (As a CMS member, Lykken says he is not yet sure himself what results ATLAS would unveil; he is bound by his collaboration’s rules not to reveal what CMS has in hand.)

Available at: <http://news.cnet.com/8301-11386_3-57341543-76/has-higgs-been-discovered-rumors--of-watershed-news-build/?tag=mncol;topStories>. Retrieved on: 11 Dec. 2011. Adapted.

Text reports that

The Microbial Puppet-Master

by Valerie Ross
from Discover Magazine:
Mind & Brain / Memory, Emotions & Decisions

When Timothy Lu was in medical school, he treated a veteran whose multiple sclerosis was so severe that she had to use a urinary catheter. As often happens with invasive medical devices, the catheters became infected with biofilms: gooey, antibioticresistant layers of bacteria. Now the 30-year-old MIT professor, who first trained as an engineer, designs viruses that destroy biofilms, which cause everything from staph infections to cholera outbreaks and that account for 65 percent of human infections overall.

Discover: You started as an electrical engineer. Was it a difficult transition becoming a biologist?

Lu: I came into the lab not really understanding how to do biology experiments and deal with chemicals. I’m not a great experimentalist with my hands, and one night I set the lab on fire.

Discover: How does a biofilm work, from an engineering perspective?

Lu: A biofilm is essentially a three-dimensional community of bacteria that live together, kind of like a bacterial apartment building or city. Biofilms are made up of the bacterial cells as well as all sorts of other material — carbohydrates, proteins, and so on — that the bacteria build to protect themselves.

Discover: And those communities make bacteria especially dangerous?

Lu: Before I started medical school, I didn’t think bacterial infections were a big deal, because I assumed antibiotics had taken care of them, but then I started seeing patients with significant biofilm infections that couldn’t be cured.

Discover: What is your strategy to destroy biofilms?

Lu: We use viruses called phages that infect bacteria but not human cells. We cut the phages’ DNA and insert a synthetic gene into the phage genome. That gene produces enzymes that can go out into the biofilm and chew it up.

Discover: If you had just $10 for entertainment, how would you spend your day?

Lu: What can you even buy with $10? Maybe I would buy a magnifying glass and just peer around in the soil to see what other life was going on down there. That would actually be fun.

Available at: <http://discovermagazine.com/2011/sep/05-questions-for-microbial-puppet-master>.Retrieved on: 11 Sep. 2011. Adapted.