This image shows a drill core of volcanic ash-hydrated lime mortar from the ancient port of Baiae in Pozzuloi Bay. Yellowish inclusions are pumice, dark stony fragments are lava, gray areas consist of other volcanic crystalline materials, and white spots are lime. The inset is a scanning electron microscope image of the special Al-tobermorite crystals that are key to the superior quality of Roman seawater concrete. (Credit: Lawrence Berkeley National Laboratory and University of California at Berkeley)
read more at: http://www.sciencedaily.com/releases/2013/06/130604135409.htm
Roman technology was very advanced, their society collapsed due to political and social forces not for a lack of tools.
Image: Don DeBold/Flickr
Apparently cliff swallows are selecting for car avoidance, at Wired.com. It would be good if squirrels, chipmunks and raccoons would either get quicker or smarter as well.
From EDN(electronic Design News) a fascinating history of a WWII bomber remote control gunsight, and it’s failure, repeatedly, while the bureaucrats insisted on pushing it forward. Great things were done during WWII but not without cost and not without clearly showing the strengths an weaknesses of the bureaucratic ‘blue model’ way of doing complex programs (at the time the only practical method of management.)
An interesting discussion, at least for a futurist / SciFi writer.
If you know someone is x years old then you can know (generally) that they will almost certainly live y more years and will be almost certainly dead in z years.
However if you know a technology (defined almost as you like but embodying knowledge) is x years old then you can (generally) expect it to last at least x more years.
So as x gets larger Tlife gets longer but Plife stays the same…so aging, that is the rough measure of, age/life, is opposite for tech vs us biotypes… An interesting idea to roll into a story sometime.
The Surprising Truth: Technology Is Aging in Reverse
A DUAL-USE technology is one that has both civilian and military applications. Enriching uranium is a good example. A country may legitimately do so to fuel power stations. Or it may do so illegitimately to arm undeclared nuclear weapons. Few, however, would think of concrete as a dual-use technology. But it can be. And one country—as it happens, one that is very interested in enriching uranium—is also good at making what is known as “ultra-high performance concrete” (UHPC).
Iran is an earthquake zone, so its engineers have developed some of the toughest building materials in the world. Such materials could also be used to protect hidden nuclear installations from the artificial equivalent of small earthquakes, namely bunker-busting bombs.
The above quote is from this wonderful Economist article, read it, as always clear prose, useful info well presented and minimal spin (&despite what some say that’s about as good as it gets spin wise if you want to explain/make a point.). It’s actually of general interest if you are interested in Civil Engineering or modern buildings and structures.
The point is that the US and others have been working on bunker busting for decades. The Massive Ordinance Penetrator shown dropping from a B52 above and in more detail below are the king of the hill right now.
Their reason for existence right now is to hold Iran’s nuclear bunkers at risk. The MOP is supposed to penetrate up to 200 ft of concrete:
The problem is that the work of Iranian engineers on tough concrete could mop up the MOP. The Iranians have added metal nano fibers and particles as well as fairly ordinary metallic, plastic and ceramic, whiskers, flakes etc to the mix to toughen the concrete in various ways. This work is being done to save lives world wide, including the US since it’s focus is on Earthquake damage reduction. But this is a wonderful example of dual use since exactly the same technology could make future bunkers all but impregnable to conventional weapons, which big as it is the MOP still is.
Bottom line if the best of the best tech were used they might get 6 or more times the strength and testing has shown just doubling concrete strength reduces penetration by more than half!
This is not good news and probably explains this:
Congress ‘Urgently’ Approves $82 Million To Improve Its Biggest Bunker-Buster
The 30,000-lb Massive Ordnance Penetrator Bomb Works So Well It Earned A Rare Honor
It would seem we may soon get a chance to see if the Iranians were smart enough to use the super concrete vs if our super bunker busters can slam, blast, burrow their way in. There is also the question of corruption, in a vastly corrupt civil society using expensive concrete which probably looks like any other concrete is an invitation for shaving. Many is the time when a fortress has fallen because of under spec materials. Also you have the long term espionage and internal strife driven sabotage the story is that bunkers for Nazi super Vengeance weapons were sabotaged by the addition of small amounts of sugar to the mix drastically weakening it.
This would all be a wonderful background for a comedic farce, if so many people’s lives were not at risk.
A short but instructive piece on wireless technology and networking, mind opening.