WEEK 10 2013
Mon- Tue- Wed-
Picture of the Week
17 March 2002
Ago, This Week, 2002
Ago, This Week, 2003
Ago, This Week, 2006
Ago, This Week, 2007
Ago, This Week, 2008
Ago, This Week, 2009
This Week, 2010
Saturday - Doing various chores, not a lot to say. The weather is improving.
Seriously, cat, WTH?
house is 1800 SF. The cat takes up, maybe, 1/2 SF. The odds against him
randomly picking my pillow to sleep on are therefore 3600:1.
So, about time to start the 'book read' table for this year, it being Week #10 already. Not much to tabulate, actually.
- In the morning I worked a bit more on the GIS, and went over and
visited with the client. It's time to wrap this project up. He pointed
out some more defects, two channels that have their names switched, and
is concerned about a third who's GIS as mapped doesn't quite jibe with
what it should be doing. He wants to make a separate field visit to
check on it, but the statement of work says "no field work". I don't
mind, really, but it's up to the boss.
to Lancaster in the early evening. It snowed in the hills the previous
night, and the hills were white even late in the day, but the road was
Book #8 was The Legion of Time,
by Jack Williamson. I read this book years ago (Vacaville, so I was in
junior high, maybe), and had long forgotten the title and author, until
seeing it on a blog somewhere. It is, like most books of it's era, very
"thin" feeling, with cardboard characters. But it's the first time I
ever encountered the idea of parallel worlds in a (semi) scientific
way, and the main themes stuck with me...
Thursday 7 March 2013
- On the road, down to Ventura. I got a fair amount done, basically
checking some underground channels against the as-built s. They seemed
off, and our draftsman, much better at this stuff than I, agreed. We
also cleaned up a bunch of old hard drives that were cluttered up with
files, so that's a plus, though not billable. Still, it's all in one
place, so that's good.
The boat was OK. There was a
damp spot from the rain on the cushion that I normally sleep on, but I
dried it out before going to bed. It rained off and on during the night
- a nice sound.
Wednesday 6 March
- I had a lousy night, woke up sick with an upset stomach, and
and felt pretty rocky all morning (no coffee when I don't feel well!).
I finally went back to bed, before noon, and felt better in the late
afternoon and got some work done. I want to get DONE with the GIS job,
and move on to other things, but there always seems to be just one more
thing. I was trying to use an SQL script for part of the updates, but
finally just got tired of that, and started moving points by hand...
did run across a remarkable picture online, of a 74 gun ship of the
line. It was American, laid down in 1824 as the USS Alabama, but not
launched until the Civil War (as the USS New Hampshire), and kept in
duty as a training ship until it burned in 1921 (renamed by then to the
Granite State, to free up New Hampshire for battleship a name). It's
unbelievable to me that no-one thought such a thing worth preserving,
The USS Alabama USS New Hampshire S/V Granite State
after the 1921 fire.
- Working away on this, that, and the other thing. I feel spread kind of thin right now...
Parallels works pretty much as
advertised. I have it running from the Bootcamp partition, and it runs
either in stardard mode, or "coherence". Coherence runs things slower,
but it allows you to bring up Excel, say, when you click on an Excel
file - even if it's on the Mac.
The downside is that it can get rather confusing, figuring out where things came from or are being saved to.
- Ah. Taxes are done. And I don't owe anything...
Over at The Endeavour,
John Cook has a series of blog posts on the differential equation of
motion. One of his reader's commented that the Millennium Bridge issue
looked like a case of negative damping.
I'd guess the Millennium
Bridge issue was more of a driving function issue (with feedback),
rather than a modification of the innate bridge damping. People
adjusting their movement at about 0.1 to 1+hz to oppose the perceived local
movement of the walk...
I'm not sure how'd you go about
analyzing this sort of problem. Aeroelasticity uses the rather funky
"k" and "pk" methods but at least the aero forces are predictable from
a superposition of the normal modes local inclination of wing
sections. A bridge is randomly and sparsely populated to heavily
populated by individuals of varying weight and reaction times - what's
the worst condition? Maybe some sort of statistical testing for worst
case? Perhaps you could monte carlo things, put an "agent" at some
nodes, programmed to apply a forcing function equivalent to leaning
against the motion.
"Work" done is an interesting aspect of this
sort of problem; dampers have started to become an integral part (heh)
of the design process in new structures such as bridges and office
towers in the last couple of decades. They've been retrofit to existing
structures such as the Millennium Bridge and much older Golden Gate
- A cool day (interesting clouds in the morning) and blowing quite hard. I
wanted to do a 5 miles walk, but not into a 33mph wind and sandstorm. I
should have gone yesterday, when it was nice, but decided to
concentrate on taxes.
I did a bit of work on the taxes, about 5 or 6 hours worth.