Hydrogen is generally an indicator of water. The idea is that neutrons decelerate to low speed (thermal) very fast when they scatter with hydrogen (because they have about of the same mass). Detection on how they have been slowed down (this is called thermalization) is key to understand the medium of interest. So when we try to find water on the Moon or Mars, neutrons are generated and scattered through rocks. This is the mechanism at the heart of Pressurized or Boiling Water Reactors (PWR / BWR) in use in most nuclear reactors. In neutron transport, it is very well known that neutrons slow down very fast when in contact with water. Neutron Thermalization is one of them.It so happens that there are other methods that can be used to find out if there is water in rocks: That water would be the reason early electromagnetic measurements were negative. the upper part of the pyramids are made of concrete, then it is very likely to the top part of the pyramid still hold millions of liters of water. The pyramid story, while interesting on its own right, is clearly setting the stage for more advances in our understanding low cost construction materials.ĭuring the presentation, Michel Barsoum mentioned that if his theory holds, i.e. As far as I can tell his main interest in the theory stands in the discovery of low cost concrete materials to be used in poor countries. For an idea of the fierceness of the debate, one can read the comments of this blog. The amount of resistance that goes with this theory is pretty impressive. Michel Barsoum and his colleagues have found some evidence that parts of the Great Pyramids of Giza were built using an early form of concrete, debunking an age old myth that they were built using only cut limestone blocks. His presentation was about the process involved in the construction of the Pyramids. When Michel Barsoum came in town to present his latest findings I was not expecting that it would have any relevancy to an items of my research interest. Here is an example of overflying an area with a stratospheric balloon at 120,000 feet at 50 mph with a 12x optical zoom.Ĭlearly, a 3x point and shoot camera can tell you if the bridge is still there. Here is an example of overflying an area with a jet at 30,000 feet at 500 mph with a 3x optical zoom (it is reduced to 10 percent but it can be shared on the web through zoomify at full scale). Here is an example of overflying an area using a Commercial plane at 3,000 feet with a 3x optical zoom (not 10,000 feet as written, click on the link). Since nobody is really an expert about stitching you can use a simple program like Autopano Pro that ask people to drag and drop images in a folder and Voila!. The stitching algorithm and software would do the rest. and they responded “but that can’t be - it’s still in Google Maps!”Maybe one of the way to bring maps without too much details is to use people taking pictures from planes and expecting them to upload all their pictures onto a web site. Jesse phoned the Red Cross multiple times to complain the bridge wasn’t there anymore. However, the Red Cross was giving evacuation directions to cross this bridge, so loads of cars would stop at the edge of this pennisula with confused drivers. My friend Jesse Robbins… headed down and helped lead the set up of a relief operation, not too far from where this bridge on US Route 90 had been completely destroyed. As can be seen from this magnificient flight pattern over the U.S: much of the territory is flown by airlines.Īnd sometimes, the needs is not for very high resolution as much as knowing that a bridge still exists. As we know, commercial airlines fly over disaster areas all the time. Paul Currion talks (in Open street Map and the next disaster ) about the need for Google maps to be updated for disasters.
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