Showing posts with label Texas. Show all posts
Showing posts with label Texas. Show all posts

Monday, May 29, 2017

Reflections on Technology in France


My wife and I recently had the privilege of spending a week in southern France, at a conference in the small town of Aurillac (pronounced "AW-ree-ack").  I say small—27,000 people is about the size of Cleburne, Texas, which is a town I'm somewhat familiar with.  Based on my admittedly very limited and undoubtedly biased observations of what we saw and experienced, I'd like to make some comparisons between the different ways that the French citizens we encountered and Texans have dealt with technology, broadly defined.

First, transportation.  In Texas, if you don't have access to a car, you are automatically placed in a category that is inhabited largely by very poor people, eccentrics, and the homeless.  There are some folks who don't drive and who also don't meet any of those descriptions, but the great majority of able-bodied adults in Texas drive nearly everywhere.

Not in Aurillac.  We flew into town and landed at the single airport, which is basically one building in a field, by a parking lot.  And we took a taxi into town, about a seven-minute ride.  But from that point onward for the next week we didn't set foot in any motorized transport, and frankly didn't miss it a bit.  At the end of our visit, we walked twenty minutes or so to the train station and rode the train to Paris.

A lot of people appear either to walk to work in Aurillac or ride bicycles.  There are cars, but the main parking in the center of town is an underground garage.  This allows the Aurillacans (Aurillacois?—I don't know enough French to say) to avoid cluttering up their thousand-year-old town with ugly parking garages, or knocking down a 15th-century church to pave the land over for Renaults or Audis.  I can't imagine how much it cost to excavate the garage without disturbing the quaint 19th-century plaza park above it—many millions, I suppose.  But it was done, somehow, and consequently, much of downtown Aurillac would still be familiar to a peasant who knew the town as it was in 1600 A. D. 

In Cleburne, they have old stuff too—the county courthouse, for instance, which dates all the way back to 1913 A. D., and was recently restored.  But for parking, you just have to find a lot somewhere or park on the street.  There is no commercial airport, and although there are train yards and an Amtrak station, getting anywhere on the train is really complicated and inconvenient.  Nearly everybody who wants to go to Cleburne drives there along U. S. 67, or takes the new tollway that connects it to downtown Fort Worth nearby via the highway loop around the city for those who are just passing through.

Next, the pattern of daily life.  When my sister lived in Cleburne, she would get up early, get in her car at maybe 7:30, and drive 45 minutes or so to her job in Fort Worth, where she runs a nursing department that uses very high-tech stuff, computers, and so on.  Then she'd drive back in the evening around 5 or 6 and have supper, and while she lived in Cleburne for close to a decade, I'm not aware that she developed any serious connections with other people in the town.

In doing this routine, my sister follows a pattern laid down by the Industrial Revolution, which requires the close scheduling of large numbers of people doing coordinated things in institutions such as factories, schools, and hospitals. 

Things are different in Aurillac.  Yes, the little tobacco and newspaper shop across the street from our hotel opened up every day about 6 AM.  But for the next three hours, there wasn't much else going on in the way of business.  Around 9 or 10, most places were open, but at noon, a lot of them closed for two hours—lunch, you see.  Then at 2, they would open up again, sometimes, and then again maybe not.  The Museum of Volcanoes we visited had such hours, and stayed open till 7 PM. 

Then, and only then, the typical Aurillac resident starts thinking about supper.  The restaurants we went to typically didn't even open in the evening until 7.  In the afternoons and evenings especially, the outdoor cafes would fill with people of all ages, sitting around talking about—well, I mostly couldn't tell what they were talking about, because I don't understand French.  But they seemed to be content to jaw for hours on end, either in person or on their mobile phones.  We did see a lot of people using mobile phones there, and I suppose that's one way in which the French and the Americans are pretty much alike:  the near-universality of the smart phone.  But the French folks we saw haven't allowed it to put an end to the practice of polite conversation at the supper table, which smartphones have nearly succeeded in doing in many U. S. households and public places.

There were bars in Aurillac, but they weren't crammed with people seemingly desperate to unwind from a tense day.  People there seemed content to sit at a table with a glass of beer and just look around, or think, and not have a phone or a paper in their hand.  You don't see that much in Cleburne.

As I say, this is a completely unscientific sample of life in France.  I'm aware of many of the negatives cited by some Americans about life there:  the excessive government regulation and intervention in the economy, the high taxes, the paucity of religious influence.  But somehow, the citizens of Aurillac have made it to 2017 without letting modern technological society homogenize them into looking like any mid-size town in the U. S. with multinational-corporation logos plastered everywhere.  They do have a McDonald's in Aurillac, but they also have butcher shops that have been in the same place, with the same tile on the floor, since 1925.  And that isn't unusual there. 

I liked Aurillac a lot, and our week there was a sample of life in a slower, more meditative lane that I hope to keep with me, at least in thought, now that I'm back in Texas.  It wasn't better or worse than Cleburne, it was just different.  But different in some ways that were very appealing.

Monday, April 22, 2013

The Disaster in West


Anyone who drives along Interstate 35 in Texas between Waco and Dallas or Fort Worth will pass through West, a small rural Texas town with a Czech heritage that was known, at least until last week, mainly for the pastries that you can buy at a bakery right next to the Interstate.  It would not have surprised me to learn that a distributor of fertilizers to local farmers operated on the east edge of town, nor that one of the kinds of fertilizer sold by the dealer was ammonium nitrate.  But when I learned of the tremendous explosion that killed at least 14 people, injured hundreds, and destroyed a good fraction of West’s built environment last Wednesday evening, April 17, my sadness was tinged with the knowledge that in warehousing large quantities of ammonium nitrate fertilizer, the firm was taking a chance that such a thing could happen.

Ammonium nitrate is a curious chemical.  A “molecule” consists of an ammonium ion (four hydrogens arranged around a nitrogen) with a positive charge and a nitrate ion (a nitrogen atom surrounded by three oxygen atoms) with a negative charge.  At room temperature, it is a solid, but its constituent elements are all gases.  And the only thing holding it together are the opposite charges retained by the ammonium and nitrate ions.  When heated gently in an open container, it breaks down into nitrous oxide (laughing gas) and water.  But when it is in contact with easily oxidized materials, such as the fertilizer urea or even some metals, heating can cause it to release oxygen, which greatly increases the heat of the reaction and can lead to a fire.  When confined by walls or even the pressure of a high stack of the material itself, burning ammonium nitrate can self-detonate.  A detonation is an explosive shock wave that travels at very high speed through a volume of material, and differs from burning as traveling by jet aircraft differs from walking.  This is apparently what happened a little after seven in the evening at the burning warehouse in West.

A back-of-the-envelope calculation of the power of the resulting blast can be done by beginning with an aerial view of the fertilizer plant before the explosion, which is still available on Google Maps.  Comparison with views of the devastated explosion site indicate that the explosion was probably centered in a large, flat warehouse building that appeared to be one story high and measured about 60 feet by 110 feet.  If we assume it was packed to a height of eight feet with ammonium nitrate (not an unreasonable assumption as distributors stock up for the summer growing season), the total mass of chemical in that building could have been as much as two thousand tons.  Pure ammonium nitrate has about a fourth of the energy content per pound as TNT.  Still, given these rough assumptions, if the whole mass went off at once, which it appears to have done, the force of the explosion could have been as great as a thousand tons of TNT, or one kiloton.

You may have run across the word “kiloton” in reference to nuclear explosions.  While there were fortunately no nuclear weapons or radioactive materials involved in the West explosion, the nuclear weapon dropped on Hiroshima at the end of World War II had a yield of only about 16 kilotons of TNT.  So what happened in West was one-sixteenth of a small nuclear bomb, in terms of destructive power.  No wonder it showed up on seismographs as a magnitude-2 earthquake.

If ammonium nitrate is so dangerous, why isn’t handling and use of it more regulated?  That’s a good question.  The Wikipedia article on ammonium nitrate notes that in 2005, Australia passed a Dangerous Goods Regulation law which requires a license for the sale or use of the material.  But if even licensed users store huge quantities of the stuff in places where it can catch fire and explode, licensing would not prevent disasters such as the one that happened to West last week, or Texas City in 1947, or over twenty other occasions since 1916 listed in a separate Wikipedia article devoted to ammonium nitrate disasters. 

Chemical companies that deal routinely with explosives know how to handle these materials so that when they explode, the explosions are limited to a small area that is sacrificed in order to protect the rest of the property and lives involved.  You simply restrict the amount of explosive allowed in one place to a maximum amount that you can afford to blow up, and then physically isolate it from all other concentrations of explosive in a series of small bunkers.  If the fertilizer stored in the West Fertilizer Company plant had been dispersed in this way, perhaps one of the small storage areas might have blown up, but with sufficient earth-berm isolation and other precautions, the explosion would not have spread.

That is small comfort for the survivors in West.  And as a practical matter, you can handle ammonium nitrate in an ordinary way without special precautions, as it is done thousands of times each year around the world, and most of the time, nothing bad will happen.  If the West firm had been required to invest in the additional storage facilities needed to treat ammonium nitrate as a true explosive, it would have gone out of business for sure.  (News reports indicate the firm nearly went bankrupt a few years ago and was rescued at the last minute by the present owner.)  So we face the dilemma of either requiring a huge investment in safety facilities on the part of fertilizer manufacturers and retailers everywhere to prevent disasters like West, or we leave things as they are and wait for the next one.

A compromise solution might be the rigorous training of anyone who deals with ammonium nitrate, enforced by a licensing law similar to the one on Australia.  This would include mandatory evacuations based on scientific calculations of a worst-case explosion whenever a fire occurs near large quantities of the stuff.  While regulations like this would not have prevented the damage caused by the West detonation, it could have reduced the death toll. 

Our thoughts and prayers are with the residents of West, whose tragic experience may lead to changes that at least mitigate the dangers involved in dealing with ammonium nitrate in the future.  

Sources:  I referred to the Wikipedia articles “Energy density,” “Ammonium nitrate” and “Ammonium nitrate disasters” as well as Google maps of the vicinity and photographs in various publications of the disaster site, and the book The Science of High Explosives by Melvin A. Cook (Reinhold, 1958).