segunda-feira, 12 de outubro de 2009

the illusion of the electric car

paradigm electric car pollution energy vector illusion
There is a misunderstanding about the actual role of the electric cars and the media does not help to elucidate it.

The electricity is an “energy vector” that substitutes the “chemical vector” of the hydrocarbon based fuels. The energy needed to charge the electric cars comes from the same energy matrix in which the non-renewable fuels have the main role.

Electric cars constitute an environmental option for metropolitan areas only concerning the local pollution, either atmospheric or noise, because the pollution that does not affect the city will occur in even greater amount in the place were the energy is being generated, due to the insertion of a energy converter in the system, to convert the chemical energy of the fuel in electric energy for the cars.

Today is Blog Action Day (blogs in a global action), to know more visit the site listed in the menu of this blog.
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sábado, 9 de maio de 2009

any doubt about the global warming ?

global warming temperature carbon dioxide level Over the past 425,000 years, cool periods have coincided with times when the CO2 concentration in the atmosphere was lower. When there is less CO2 in the atmosphere, the greenhouse effect is reduced and the world cools.
The blue and red line indicates the variation in average global temperature compared with the 1961–1990 average. The green line shows the concentration of CO2 in the atmosphere. (Pay close attention to the right-hand edge of the graph.)
This graph shows four eras when the world was cooler than it is today. These are separated by brief warm periods, like the one we are now in.

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There is much discussion about the global warming. Many still have doubts about if it is a real threat, even if it will actually happen.
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Observing the global atmosphere temperature along the past one sees that it presents a sort of cyblic behavior approximately each hundred thousand years. According to this cyclic behavior we are in the end of a "hot time", and this is the reason of the belief that, instead of a global warming, we are about to enter a new glacial era.
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Paying attention to the historic record of the carbon dioxide concentration in the atmosphere turns evident the close relation between it and the temperature of the atmosphere.
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Looking closely to the very right side of the graphic above it is possible to see that the carbon dioxide concentration rose dramatically. This leads us to infer that the global temperature will be pushed up.
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It follows a plot of the last hundred and thirty years increase in the carbon dioxide concentration.
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Sources:
Woods Hole Research Center
UNEP - United Nations Environment Programme

sábado, 11 de abril de 2009

other paradigms

other paradigms giordano bruno catholic inquisition

This picture, a xylography done by an unknown artist in 1600 A.C., well represents the idea of the search, analysis, acceptance of new concepts. The man in it can be thought as Giordano Bruno, which, after seven years of prison and torture, was murdered by the Inquisition just because he supported the idea of an infinite universe, possibly plenty of life, even outside Earth.
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Our intention is to expose and discuss ideas with freedom, regardless any cultural constraints.

Figure: author unknown

sexta-feira, 10 de abril de 2009

paradigm

. meaning of paradigm epistemology scientific revolution antikythera mechanism

According to The Language of Philosophy – Dictionary and Research Guide, "since the late 1960s, the word paradigm has referred to a thought pattern in any scientific discipline or other epistemological context. Initially the word was specific to grammar: the 1900 Merriam-Webster dictionary defines its technical use only in the context of grammar or, in rhetoric, as a term for an illustrative parable or fable".
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The enlargement of the meaning of paradigm came after Thomas Kuhn, which published in 1962, The Structure of Scientific Revolutions, discussing the sort of ideas that was acceptable in different historic eras that lead to cultural revolutions.
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To illustrate a paradigm I brought the Antikythera mechanism, constructed in an era in wich we do not believed one had the hability to do so.
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To know more acesss the link 
http://en.wikipedia.org/wiki/Antikythera_mechanism
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Figure: The Antikythera Mechanism
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