Time Sink

I’ve long since passed the point when celebrating a birthday is a big deal — the last party I had was for #30, where we all dressed in black to mourn the passing of my youth. Fortunately the rumors of its death were greatly exaggerated (at least the behavioral part). But I used this year’s birthday as an excuse to buy a high-speed video camera (Exilim EX-FH20). It arrived a few days ago and I’ve been playing with it a lot. Soon, perhaps, I’ll actually install the user’s manual from the CD and read it.

So expect some postings of things gratuitously shot in slow-motion, with no real point to them (in stark contrast to so many of my posts) other than some thing shot in slo-mo look pretty cool. I suspect that many of my belongings will end up broken, but that that the destruction of my property will be exceeding well-documented.

Here is an early attempt, lighting a match in a candle flame, at 1000 fps.

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Potpourri for $200

Lots of great stuff on kottke recently

Dan Baum: The Following Account of My Short Career at The New Yorker Ran as a Series of Tweets on May 8, 11, and 12, 2009

Three tweets: (Thufferin’ Thuccotath!)

of arms. Tom Wolfe is right, I think, when admonishes young writers to ignore the old advice about “writing what

you know,” and instead write about what you don’t know. If you have to learn about something from scratch, he

argues, you don’t bring any lazy preconceptions. John said I was welcome to give it a try. “Think about trying a

Advice from Rat Traders

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Only-slightly-3-d art: Simon Schubert (small folds in paper) and Marco Maggi (slides 06-9 through 06-12 are “pencil on aluminum foil”)

Dinner Diffusion, and Difficult Decisions

The DAMOP conference is coming up, and that reminds me of a conference-related phenomenon related to gathering a group to go off to a meal. This doesn’t manifest itself when the conference provides meals, so it wasn’t an issue last fall; when the meals are being served you can just grab some people that you know and sit, or if you are so inclined, sit with some strangers and strike up a conversation. “What is your research” is a pretty safe way to begin. (etiquette tip: if your conversation partner has a really nice pair of research grants, do not stare at or make comments about them. It’s not polite.)

But when left on your own, you have a bit of a problem. The questions of who is going, where you are going (related to what you will eat) and when to go (less of a problem at lunch) all come into play. Usually the “when” is decided first, and you set a meeting spot. Often you’ll have a nearest-neighbor issue, where you ask someone if they want to grab something to eat, and they tell you they were going to meet up with someone else, and so on, or the reverse of that, where some of the people you’ve asked will later approach others.

People start to arrive at the meeting spot, with some distribution of arrival times probably not actually centered on the agreed-upon meeting time. Because of the aforementioned networking, the earliest ones may not know what size crowd to anticpate. People show up and mention who else is expected to arrive “soon,” and then an interesting thing happens: some people will decide that since departure is not imminent, they can run off and do something that will “only take them a few minutes” (make a phone call, drop off something in their room, change the transmission in their car) and the group size can stay roughly constant as people diffuse in and out. You’re kind of stuck if the group size is below critical mass — not really enough people for a good round of discussion or if you’re all colleagues already and there will be nothing new to talk about, so you keep waiting for that fluctuation that brings more people in than out so you can cross that threshold. (for me this is about 6 people or so). However, if the diffusion is happening with more than critical mass, you can either decide to leave for dinner en masse and abandon the people who had diffused out or are late, or some of you can fission out of the group, leaving the remainder as a nucleation site to gather a new dinner crowd.

Once you’ve sallied forth, the other decision needs to be made: where/what to eat. You can wander aimlessly from restaurant to restaurant, which is common especially early in a conference if nobody knows the town. The problem here is that someone will almost always find fault with the restaurant (price, selection, if there’s a wait involved), forcing you to keep moving on to find other eateries, which come with other sets of objections. My personal preference takes me away from seafood restaurants, and I know one or two people with honest-to-goodness seafood allergies who are good allies to have in voting against places that serve only seafood (this was especially handy when I was in New Orleans, pre-Katrina; some places seemed to have crawfish in every menu item). Generally the objections become muted as you get really hungry and/or tired of walking, and you all finally compromise on a place. The other option is to have a restaurant in mind, but if it’s later in the week and you keep gathering different sets of people, there’s the chance that someone will have just been there and will resist going again. I don’t have a real problem with resampling a restaurant if they have a variety of entrées that I like, but will back off going to the OneTrickPony Café on consecutive nights. Both of these problems get worse as the group gets larger, of course.

One thing I’ve discovered is that many people simply don’t like making the decision. They’re happy to go almost anywhere, but don’t want to be a strong advocate of anything because they don’t really have a conviction about it. If you try and form a consensus, (what do you think about Joe’s Steakhouse?) you’ll get a lot of lukewarm responses or very mild dissent, and the consensus-builder won’t get the warm mandate feeling. However, if you just announce “We’re going to Joe’s Steakhouse!” most people will go along, and be glad that someone else made the call. It’s only if someone adamantly opposes the announcement that you need to rethink things. If you can actually be so organized as to make this decision before gathering people for dinner, all the better.

Bon Appétit!

Physics v Chemistry. This Time it's Personal …

Experimental Error: Physics vs Chemistry: Fight!

I often contemplate the differences between these two areas of study. Also, I hear fellow undergrads argue for one or the other, usually divided along the lines of their respective major. Anymore, I think they’re so interrelated that I find it hard to find a difference between the two, except for the phases of matter that they most often deal with.

Same? Different? I think we should forget that, team up, and beat the crap out of biology.

Yakity Yak

Oh, wait. Wrong coasters.

Cocktail Party Physics: a new wrinkle

The Rocket Scientist is the only faculty member I’ve ever known who keeps coasters in his office (and requires their use). I’ll let you figure out what a coaster fetish tells you about RS – I have my own theories, but (ignoring for the moment the fact that we work for a public university and all our furniture is laminate) there actually are really good reasons for one to use coasters.

Trivia: polymethylmethacrylate (PMMA, mentioned in the post) is an electron-beam resist. That is, if you zap it with electrons (or hard UV) you break some bonds, and the exposed material can be removed chemically. Makes it a useful mask material for various lithography applications.

Synchronicity

I was browsing the web and ran across this Gigapixel image of downtown Vancouver. I used to live there — not downtown, since my postdoc salary wouldn’t support that — but I opened it to see if I recognized the area. And I did, but not from when I lived there. I went to a conference there a few years ago, and went geocaching in the mornings as my internal clock ensured that I was always awake by 5 AM. Went out and about and got back by 7, in time to get ready for the morning sessions. There’s a geocache hidden in that gazebo-like structure. The picture was taken from a bridge, and from the photographer’s perspective, the hockey/basketball venue is to the right and a little behind.

Here it is on Google maps

Aye Arr!

Picked up another light source. My previous broadband purchase was a UV light , and since I was deficient on the other side of the visible spectrum, I grabbed an IR source LED flashlight. I snuck into the lab to measure the spectrum, because we have an analyzer that covers 600-1700 nm. Just popped the flashlight onto the input jack (for fiber) and that coupled enough light in to make a measurement.

Here’s what it looked like:
ando

The early scans were smooth, so I’m not sure if the couple of dips in there are a result of some setting I changed, or if it’s a real effect (perhaps of heating up — the flashlight gets warm after a while, and this is a scan of the output after it was on for a few minutes)

This isn’t the first (nor, I expect, the last) test of something mundane, just because the equipment is available. A few years back there was a rumor that the US $20 bill had an RFID chip in it, located in Andrew Jackson’s eye, as “evidenced” by bills burning at that position when microwaved. A colleague and I tested that with a network analyzer, since an RFID chip should have a strong absorption feature on resonance. Nada. Not surprisingly, it’s an urban legend. (I swear it’s not there. Trust me: I work for the government)