Skip to main content

An Afternoon in San Francisco

I flew into San Francisco this morning about eleven o'clock. I'm staying at the Hotel Des Art in the middle of everything. My room wasn't ready until three, so I went down to the wharf to hang out. The short version: I got a haircut, went down to the Buena Vista for lunch, saw some art and listened to some music.

First, the haircut. I was a little flattered when my new barber told me I had a great shaped head. Who knew! My parents have often told me that they turned me over every six hours just like the doctor said to make sure I didn't wind up with a lopsided head. Finally, we all have the proof that it actually worked! Next, my barber commented that I have a lot of hair. Cool, I guess where I still have it at all, there is quite a bit of it.

All of this was well and fine until about the fifth time he told me the same things. I hadn't been paying attention. I looked up and realized that apparently he had taken it as his personal mission to display my 'well-shaped' head to the world by getting rid of a 'lot of hair'. I'm happy to report that I got him stopped without incident. I'll be able to save quite a bit of time brushing my hair for the next weeks. There's just not enough left to bother with at the moment.

Next, it was off to the Buena Vista for my traditional Irish Coffee and breakfast. That's where I met Lea my waitress and Andy a weekend regular seated at the bar next to me. Lea recently did a voice over for a children's story book where she played nineteen different characters! Andy has lived in the San Francisco area since 1958. He had lots of great stories, but the best by far had to do with the advent of Go-Go dancers at the Condor club, hydraulically lifted pianos and the dangers of mixing extra-marital sex with the same.


Well fed, I headed a few doors down to my favorite art gallery to check out their new additions.


Finally, a little more artistically educated I headed for home. On the way, I walked by Adventure Coffee on Columbus. As I passed the open door I heard a beautiful voice, looked inside and saw it's owner playing guitar. I wandered up the sidewalk a few more doors, had a gut feeling I should have stopped and headed back.

Rogin Galante Singer/Songwriter

Comments

Popular posts from this blog

Cool Math Tricks: Deriving the Divergence, (Del or Nabla) into New (Cylindrical) Coordinate Systems

The following is a pretty lengthy procedure, but converting the divergence, (nabla, del) operator between coordinate systems comes up pretty often. While there are tables for converting between common coordinate systems, there seem to be fewer explanations of the procedure for deriving the conversion, so here goes!

What do we actually want?

To convert the Cartesian nabla



to the nabla for another coordinate system, say… cylindrical coordinates.



What we’ll need:

1. The Cartesian Nabla:



2. A set of equations relating the Cartesian coordinates to cylindrical coordinates:



3. A set of equations relating the Cartesian basis vectors to the basis vectors of the new coordinate system:



How to do it:

Use the chain rule for differentiation to convert the derivatives with respect to the Cartesian variables to derivatives with respect to the cylindrical variables.

The chain rule can be used to convert a differential operator in terms of one variable into a series of differential operators in terms of othe…

Lost Phone

We were incredibly lucky to have both been in university settings when our kids were born.  When No. 1 arrived, we were both still grad students.  Not long after No. 2 arrived, (about 10 days to be exact), mom-person defended her dissertation and gained the appellation prependage Dr. 

While there are lots of perks attendant to grad school, not the least of them phenomenal health insurance, that’s not the one that’s come to mind for me just now.  The one I’m most grateful for at the moment with respect to our kids was the opportunities for sheer independence.  Most days, we’d meet for lunch on the quad of whatever university we were hanging out at at the time, (physics research requires a bit of travel), to eat lunch.  During those lunches, the kids could crawl, toddle, or jog off into the distance.  There were no roads, and therefore no cars.  And, I realize now with a certain wistful bliss I had no knowledge of at the time, there were also very few people at hand that new what a baby…

Lab Book 2014_07_10 More NaI Characterization

Summary: Much more plunking around with the NaI detector and sources today.  A Pb shield was built to eliminate cosmic ray muons as well as potassium 40 radiation from the concreted building.  The spectra are much cleaner, but still don't have the count rates or distinctive peaks that are expected.
New to the experiment?  Scroll to the bottom to see background and get caught up.
Lab Book Threshold for the QVT is currently set at -1.49 volts.  Remember to divide this by 100 to get the actual threshold voltage. A new spectrum recording the lines of all three sources, Cs 137, Co 60, and Sr 90, was started at approximately 10:55. Took data for about an hour.
Started the Cs 137 only spectrum at about 11:55 AM

Here’s the no-source background from yesterday
In comparison, here’s the 3 source spectrum from this morning.

The three source spectrum shows peak structure not exhibited by the background alone. I forgot to take scope pictures of the Cs137 run. I do however, have the printout, and…