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Warn moderators| Author : | Topic: dynamics | Bottom |
| saucer admin Posts : 673 A Good Tautology is Hard to Find!  |
-    saucer - --Last edited by saucer on 2007-03-06 18:43:11 -- |
| saucer admin Posts : 673 A Good Tautology is Hard to Find! |
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| saucer admin Posts : 673 A Good Tautology is Hard to Find! |
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| saucer admin Posts : 673 A Good Tautology is Hard to Find! |
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| saucer admin Posts : 673 A Good Tautology is Hard to Find! |
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| saucer admin Posts : 673 A Good Tautology is Hard to Find! |
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| very very small tic Posts : 70  |
 Northrop Grumman X-47B--Last edited by saucer on 2007-04-07 18:50:41 -- |
| saucer admin Posts : 673 A Good Tautology is Hard to Find! |
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| saucer admin Posts : 673 A Good Tautology is Hard to Find! |
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| saucer admin Posts : 673 A Good Tautology is Hard to Find! |
-  F16  F14TOMCAT- --Last edited by saucer on 2007-05-19 20:47:52 -- |
| saucer admin Posts : 673 A Good Tautology is Hard to Find! |
-  Venus- |
| saucer admin Posts : 673 A Good Tautology is Hard to Find! |
-  Cadillac Cien   - --Last edited by saucer on 2007-05-19 21:26:06 -- |
| ferme Posts : 85 |
saucer, Norwegian scientists have drawn up a league table of alternative fuels for cars based on what they call a "well-to-wheel" analysis. Their approach takes into account the energy costs in manufacturing, total energy use, and overall pollution included greenhouse gas emissions. Unsurprisingly, petrol and diesel vehicles foot the table, closely followed by hybrid vehicles. In contrast, the greenest way to power a vehicle turns out to be to use an electric fuel cell powered by hydrogen made from natural gas, methane. According to Karl Høyer of Oslo University College and Erling Holden of Western Norway Research Institute, who have looked at complete fuel chains for vehicle propulsion, there is no consensus regarding sustainable transport development. "Alternative fuels, such as hydrogen, bioethanol, and compressed gas, are not in themselves a road towards sustainable mobility," the researchers say. However, they point out that petrol and diesel are the worst offenders. "Any alternative fuel we considered is better than the cars that are used mostly today," they add. "It must be emphasised that no single chain comes out with the best score on all impact categories," the researchers say, "There are always some sorts of trade offs involved. Thus, there are no obvious winners; only good or bad trade offs between different impact categories." Interestingly, the team's analysis puts natural gas conversion into hydrogen for fuel cells at the top of the list. Natural gas is usually considered a fossil fuel because it recent research also shows that microbes within the earth also produce huge quantities of methane that could be tapped to provide a sustainable future for transport. Jennifer McIntosh, a groundwater geochemist in the Hydrology and Water Resources Department at The University of Arizona explains that some of the biggest natural gas fields in the world are biogenic. She and colleagues Stephen Osborn and Justin Clark working with Chris Ballentine of The University of Manchester, Klaus Nüsslein and Steven Petsch of The University of Massachusetts Amherst, Mark Person, at Indiana University, Peter Warwick of the United States Geological Survey, Stephen Grasby, of the Geological Survey of Canada, and Anna Martini of Amherst College, are currently studying the factors that influence how methanogenic microbes create these gas reserves and investigating how fluids migrate through the fields and affect microbial activity. "We sample the gas and water that comes out of the wells and look at its chemistry and its isotopic composition," McIntosh explains, "and then we're able to determine how the gas was created." Their analyses can distinguish between natural gas formed by methanogenic microbes or by geological processes involving heat and pressure acting on ancient organic matter below the surface. "The gases created by these different processes have different isotopic signatures," she adds. Biogenic gas deposits are found mainly in sedimentary basins across the globe formed during the Palaeozoic Age, about 540 to 250 million years ago, including basins of the mid-continental Canada and USA. McIntosh's work is of enormous interest to the oil and gas industry in the areas of exploration and exploitation of microbially generated gas fields. ferme.. --Last edited by saucer on 2008-02-15 10:37:30 -- |
| ferme Posts : 85 |
  What’s ugly as can be, has 8 wheels, and goes from zero to sixty miles per hour in 4.2 seconds? It’s Eliica, the $260,000 electric-powered vehicle built by the Keio University in Tokyo. Eliica has been around for a while, but it’s state-of-the-art as it uses nothing but Li-Ion batteries for power and can achieve a top speed of 230mph with a range of 185 miles (obviously not at top speed). For a bit of flair, Eliica even sports gull wing doors. Obviously a case of excess in every way, but it’s interesting to see what can be done with a little know-how and a lot of money. More details can be found on Eliica’s official bog, provided of course you can read Japanese. ferme --Last edited by ferme on 2007-05-31 00:01:36 -- |
| ferme Posts : 85 |
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| ferme Posts : 85 |
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| ferme Posts : 85 |
 Renault Nepta Concept Car |
| ferme Posts : 85 |
 Ford concept car, Shelby GR-1 |
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